Статті в журналах: "Phosphate removing"

1

Bond, P. L., P. Hugenholtz, J. Keller, and L. L. Blackall. "Bacterial community structures of phosphate-removing and non-phosphate-removing activated sludges from sequencing batch reactors." Applied and environmental microbiology 61, no. 5 (1995): 1910–16. http://dx.doi.org/10.1128/aem.61.5.1910-1916.1995.

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2

Ubukata, Y., and S. Takii. "Induction ability of excess phosphate accumulation for phosphate removing bacteria." Water Research 28, no. 1 (January 1994): 247–49. http://dx.doi.org/10.1016/0043-1354(94)90141-4.

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3

Ubukata, Y., and S. Takii. "Some physiological characteristics of a phosphate-removing bacterium, microlunatus phosphovorus, and a simplified isolation and identification method for phosphate-removing bacteria." Water Science and Technology 38, no. 1 (July 1, 1998): 149–57. http://dx.doi.org/10.2166/wst.1998.0037.

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Some physiological characteristics of a phosphate (Pi)-removing bacterium, Microlunatus phosphovorus, are investigated using aerobically grown cells and cells exhibiting excess Pi accumulation (EPA) in order to determine a simplified isolation and identification method for other Pi-removing bacteria. Such a method would save on the amount of sterile equipment needed, and reduce the number of experimental steps and labor time. The EPA activity of the isolate reached a plateau 13 hours into the anaerobic incubation time, but it reached 70% of that level after only 5 hours. The EPA activity of the cells during the stationary growth phase was higher than that during the exponential growth phase. Polyphosphate (polyP) accumulated in the cells was shown to be used as an energy storage material (a phosphagen) under both aerobic and anaerobic conditions. During aerobic starvation, the rate of decrease in the ATP concentration of the suspension of cells that contained polyP was markedly less than that of the suspension of cells without polyP. Therefore, bacterial cells rich in polyP survive longer than bacterial cells lacking polyP.

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4

Xie, Youhui, Qin Li, Xianzhi Zhao, Yi Luo, Yangming Wang, Xiangwei Peng, Qigui Wang, Jian Su, and Yin Lu. "Removing and Recovering Phosphate from Poultry Wastewater Using Amorphous Ceramics." Journal of Chemistry 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/132582.

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A novel and effective technique for phosphate from poultry wastewater was developed using amorphous ceramics. Amorphous ceramics, which showed high performance for phosphate removal and recovery from poultry wastewater, were synthesized using unlimitedly available, inexpensive materials such as silica fume and lime. Dissolved phosphate in poultry wastewater can be deposited as a solid on the surface of amorphous ceramics. Phosphate content on the surface of amorphous ceramics could reach 14.20%. The phosphate removal and recovery process and mechanism was revealed by a series of characterizations, such as XRD, FESEM, BET, and so on. The present study demonstrated that amorphous ceramics have great potential as a novel, beneficial material for removing and recovering phosphate from poultry wastewater.

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5

Jun, Tae-Sung, No-Hyung Park, Dea-Sup So, Joon-Woo Lee, Kwang Bo Shim, and Heon Ham. "Phosphate removing by graphene oxide in aqueous solution." Journal of the Korean Crystal Growth and Crystal Technology 23, no. 6 (December 31, 2013): 325–28. http://dx.doi.org/10.6111/jkcgct.2013.23.6.325.

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6

Nounah, A., M. Ferhat, and J. L. Lacout. "Removing Cadmium from Phosphate Ores by Pyrometallurgical Process." Advanced Materials Research 1-2 (September 1994): 155–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1-2.155.

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7

Ruzhitskaya, Olga. "Efficient phosphate removal by biological corrosion method." E3S Web of Conferences 180 (2020): 04009. http://dx.doi.org/10.1051/e3sconf/202018004009.

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Water quality deterioration in water bodies is directly related to the development of anthropogenic eutrophication processes. To resolve this complex issue, one needs to minimize biogenic discharge of nitrogen and phosphorus compounds into the water bodies. The article presents relevant information in the field of phosphate-removing wastewater treatment, describes the most effective biological and biological-chemical methods of phosphate-removing wastewater treatment. The article presents the results of research on phosphate-removing wastewater treatment methods using iron-bearing reinforced feed material (biological corrosion method, biogalvanic method). The placement of reinforced feed material in a standard air tank allowed to significantly increase the efficiency of organic contamination-removing biological wastewater treatment. The biological process activation ratio due to the use of reinforced feed material amounted to 1.78. The placement of reinforced feed material in the bioreactor, which operates without activated sludge return, allowed to achieve complete phosphate removal from the waste water. The maximum effect of phosphate removal (99 %) with the concentration of phosphate in treated water below the detection limit was achieved after 4 to 6 hours of wastewater treatment in the bioreactor, with the concentration of organic contamination in the incoming wastewater from 150 to 300 mgBOD/L and the concentration of phosphate upstream of the bioreactor from 4 to 6 mg PO4/L. Based on the research carried out, it was concluded that the use of biological corrosion method allows to achieve high efficiency of phosphate removal, as well as to intensify the biological process of organic contamination removal from waste water.

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8

Wang, Yu Qi, Qi Zhang, Luo Feng Liu, Bi Jun Luo, Dan Wu, and Ping Huang Xi. "Study on Removing Ammonium Nitrogen from Wastewater Using Magnesium Hydroxide." Advanced Materials Research 955-959 (June 2014): 2550–53. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2550.

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Magnesium ammonium phosphate (MAP) precipitation has been studied by using magnesium hydroxide and sodium dihydrogen phosphate as precipitators for treating simulation wastewater in which the concentration of ammonia nitrogen is 10.00g/L. The effect of reaction time, pH and precipitator ratio on ammonium nitrogen removal rate has been investigated. The obtained optimum treatment conditions of MAP precipitation for treating ammonia nitrogen wastewater are as follows: reaction time is 4 hours, pH is 8.0, the molar ratio of sodium dihydrogen phosphate and ammonia nitrogen in wastewater, i.e. n (P):n (N), is 1.2, the molar ratio of magnesium hydroxide and sodium dihydrogen phosphate, i.e. n (Mg):n (P), is 1.4. Under these conditions, the ammonium nitrogen removal rate, by using MAP precipitation for treating simulation ammonia nitrogen wastewater, is 90.71%.

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9

Cloete, T. E., P. L. Steyn, and L. Buchan. "An Aut-Ecological Study of Acinetobacter in Activated Sludge." Water Science and Technology 17, no. 11-12 (November 1, 1985): 139–46. http://dx.doi.org/10.2166/wst.1985.0228.

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Data are reported on the role of Acinetobacter in phosphate removal in activated sludge. The fluorescent antibody (FA) technique was applied in an autecological study of Acinetobacter in this habitat. Results indicated that Acinetobacter was present in numbers exceeding 106 organisms per cm3 throughout all zones of the activated sludge process, with higher numbers occurring in the aeration zone. It was also found that Acinetobacter numbers did not vary regardless of whether phosphate was removed or not. Combined electron microscopy and electron dispersive micro-analysis of X-rays (EDAX) furthermore indicated that bacteria from phosphate removing activated sludge plants contained phosphate granules, whereas those from non-removing plants or where removal had stopped, did not contain phosphate granules at all. Hence, it was concluded that no major population shifts of Acinetobacter occurred in activated sludge and that the process of phosphate accumulation is induced in Acinetobacter. However, Acinetobacter never occurred in numbers sufficiently large to account for phosphate removal to the extent sometimes observed in activated sludge.

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10

Affandi, Komala Affiyanti, and Arseto Yekti Bagastyo. "Removal of ammonium and phosphate in the simulated wastewater by using coal fly ash adsorbent." Sustinere: Journal of Environment and Sustainability 5, no. 1 (April 23, 2021): 24–35. http://dx.doi.org/10.22515/sustinere.jes.v5i1.129.

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The main composition and availability of fly ash cause this waste which has potential as an adsorbent to remove ammonium and phosphate in water. Difference of main composition will cause different removal efficiency. The purposes from this research are to determine optimal condition for removing concentration ammonium and phosphate and to determine the source of fly ash which has great potential for ammonium and phosphate removal in solution. The optimal conditions were carried out by varying pH of solution and adsorbent dosages to remove ammonium and phosphate concentrations in different initial concentrations. Optimum pH of solution in this research is 8 with range of ammonium removal efficiency 8% to 14% and 16% to 75% for removing phosphate which has condition ammonium concentration higher than phosphate. Ammonium concentration lower than phosphate will have a negative effect on the removal. Adsorbent dosage of 4.5 g is able to produce optimal removal efficiency both ammonium and phosphate. From five different sources of fly ash, Punagaya fly ash has the great potential for removal ammonium and phosphate simultaneously which has an adsorption capacity of 7.17 mg/g and 19.50 mg/g for ammonium and phosphate respectively.

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11

Liu, Zhixiang, Juan Feng, Chendi Min, Lei Gan, and Ying Shi. "Removal of Low Concentration Phosphate in Phosphogypsum Leachate." E3S Web of Conferences 136 (2019): 06018. http://dx.doi.org/10.1051/e3sconf/201913606018.

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In order to find a method for removing low-concentration phosphate from phosphogypsum leachate, modified quartz sand was used as adsorbent. The effects of adsorbent dosage, phosphate concentration and adsorption time on phosphate removal efficiency were investigated. The results show that the optimum dosage of modified quartz sand was 0.024g/mL. The effluent phosphate concentration was lower than 0.023g/mL, and the phosphate removal efficiency could reach up to 98%.

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12

Ubukata, Y. "Some physiological characteristics of a phosphate removing bacterium isolated from anaerobic/aerobic activated sludge." Water Science and Technology 30, no. 6 (September 1, 1994): 229–35. http://dx.doi.org/10.2166/wst.1994.0273.

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We succeeded in the isolation of a phosphate removing bacterium which takes up casamino acids while releasing phosphate anaerobically and takes up phosphate aerobically. The function of excess phosphate accumulation was induced by alternating anaerobic incubation with organic substrates and aerobic incubation without organic substrates. The following physiological characteristics were shown by further investigation. (1) The presence of casamino acids in aerobic incubation did not inhibit greatly the induction of excess phosphate accumulation, but suppressed the uptake of phosphate because the cells take up casamino acids using the energy produced by the hydrolysis of polyphosphate even in aerobic conditions. (2) Within one hour in anaerobic conditions the cells had taken up casamino acids to as much as 25% of the cell dry weight and the rate of ammonium excretion was small against that in oxidative metabolism. In anaerobic conditions the synthesis of DNA did not occur and the ratio of excreted phosphorus to removed glutamic acid was about 0.5 M/M. This value is very small against that required for the polymerization of the substrate. Therefore a large amount of low molecular weight material, such as amino acids, seems to be accumulated in the cells.

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13

Contreras-López, Eliana, Victor Miyashiro Kiyan, Jaime Porras Cerrón, Ana María Muñoz, Fernando Ramos-Escudero, Marcelo Portuguez-Maurtua, Ricardo Yuli-Posadas, and Humberto Garayar-Tasayco. "Sanky (Corryocactus brevistylus) Peel as Low-Cost Adsorbent for Removal of Phosphate from Aqueous Solutions." Sustainability 13, no. 16 (August 11, 2021): 8994. http://dx.doi.org/10.3390/su13168994.

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This study aimed to evaluate the adsorption capacity of an adsorbent obtained using sanky peel for the removal of phosphate from aqueous solutions. The study was conducted in two stages: (1) adsorbent preparation considering yield, phosphate removal, adsorption capacity, and textural characteristics; (2) an assessment of the effectiveness of using sanky peel as an adsorbent for removing phosphates from aqueous solutions. Batch adsorption was studied in aqueous solutions containing phosphate and calcium ions with the selected adsorbent. Adsorption kinetics and equilibrium isotherms were studied using mathematical models. The adsorption kinetics followed the pseudo-second-order, Elovich, and Weber–Morris models, thus demonstrating that adsorption rates were not controlled by multiple processes. Adsorption equilibrium data fitted best with the Dubinin–Radushkevich model. Finally, a Fourier transform infrared spectroscopy analysis revealed the presence of brushite spectra bands after adsorption. The results of this study can help better understand the use of sanky peel as an adsorbent and good alternative for aqueous phosphate adsorption.

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14

Hassanein, Mohamed, Heather Laird-Fick, Richa Tikaria, and Saleh Aldasouqi. "Removing the problem: parathyroidectomy for calciphylaxis." BMJ Case Reports 11, no. 1 (December 2018): e226696. http://dx.doi.org/10.1136/bcr-2018-226696.

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Calcific uremic arteriolopathy (CUA), widely known as calciphylaxis, is a rare and lethal disease that usually affects patients with end-stage renal disease. It is characterised by widespread vascular calcification leading to tissue ischaemia and necrosis and formation of characteristic skin lesions with black eschar. Treatment options include sodium thiosulfate, cinacalcet, phosphate binders and in resistant cases, parathyroidectomy. We report a case of recurrent, treatment-resistant CUA successfully treated with parathyroidectomy. Her postoperative course was complicated by hungry bone syndrome and worsening of her wounds before they completely healed. We then discuss the morbidity of CUA, including the controversy around the use of parathyroidectomy and risk of aggressive management of hungry bone syndrome.

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15

Ubukata, Y., and S. Takii. "Induction method of excess phosphate accumulation for phosphate removing bacteria isolated from anaerobic/aerobic activated sludge." Water Science and Technology 30, no. 6 (September 1, 1994): 221–27. http://dx.doi.org/10.2166/wst.1994.0272.

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Many bacteria considered to be phosphate removing bacteria (PRB) have previously been isolated from phosphate removing activated sludge (PRAS). However, these bacteria have never exhibited the typical function of PRB which take up excessive phosphate (P) in aerobic conditions and release P with a concomitant uptake of organic substrates in anaerobic conditions. We hypothesized that the enzyme system responsible for excess P accumulation (EPA) should be inducible, because PRB can take up organic substrates anaerobically in spite of being obligate aerobes. Therefore, PRB cells grown aerobically have to be additionally treated with alternating anaerobic incubation with organic substrates and aerobic incubation without organic substrates to exhibit the above typical function. We succeeded in the first isolation of a strain of true PRB by this induction method. The isolate is a Gram-positive coccus and its generation time is approximately 12 hours. The anaerobic/aerobic incubation cycle was required at least two times (2 days) to induce the ability of EPA for PRB. The velocity of P removal in the aerobic phase was decreased to approximately half by the existence of organic substrates. Therefore, it is recommended that organic compounds be removed during the anaerobic phase in PRAS systems.

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16

Ahn, Johwan, Sarah Schroeder, Michael Beer, Simon McIlroy, Ronald C. Bayly, John W. May, George Vasiliadis, and Robert J. Seviour. "Ecology of the Microbial Community Removing Phosphate from Wastewater under Continuously Aerobic Conditions in a Sequencing Batch Reactor." Applied and Environmental Microbiology 73, no. 7 (February 9, 2007): 2257–70. http://dx.doi.org/10.1128/aem.02080-06.

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ABSTRACT All activated sludge systems for removing phosphate microbiologically are configured so the biomass is cycled continuously through alternating anaerobic and aerobic zones. This paper describes a novel aerobic process capable of decreasing the amount of phosphate from 10 to 12 mg P liter−1 to less than 0.1 mg P liter−1 (when expressed as phosphorus) over an extended period from two wastewaters with low chemical oxygen demand. One wastewater was synthetic, and the other was a clarified effluent from a conventional activated sludge system. Unlike anaerobic/aerobic enhanced biological phosphate removal (EBPR) processes where the organic substrates and the phosphate are supplied simultaneously to the biomass under anaerobic conditions, in this aerobic process, the addition of acetate, which begins the feed stage, is temporally separated from the addition of phosphate, which begins the famine stage. Conditions for establishing this process in a sequencing batch reactor are detailed, together with a description of the changes in poly-β-hydroxyalkanoate (PHA) and poly(P) levels in the biomass occurring under the feed and famine regimes, which closely resemble those reported in anaerobic/aerobic EBPR processes. Profiles obtained with denaturing gradient gel electrophoresis were very similar for communities fed both wastewaters, and once established, these communities remained stable over prolonged periods of time. 16S rRNA-based clone libraries generated from the two communities were also very similar. Fluorescence in situ hybridization (FISH)/microautoradiography and histochemical staining revealed that “Candidatus Accumulibacter phosphatis” bacteria were the dominant poly(P)-accumulating organisms (PAO) in both communities, with the phenotype expected for PAO. FISH also identified large numbers of betaproteobacterial Dechloromonas and alphaproteobacterial tetrad-forming organisms related to Defluviicoccus in both communities, but while these organisms assimilated acetate and contained intracellular PHA during the feed stages, they never accumulated poly(P) during the cycles, consistent with the phenotype of glycogen-accumulating organisms.

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17

Seo, Seong Gyu, Kyung-Jun Hwang, Ho-Hyun Ahn, Wang Geun Shim, and Min-Jin Hwang. "Preparation of Mesoporous Gamma Alumina Derived from Waste Can for Nutrient Recovery Process." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4267–70. http://dx.doi.org/10.1166/jnn.2020.17603.

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Mesoporous gamma alumina (MGA) was synthesized using aluminum trash containers by a low temperature hydrothermal method for effectively removing phosphate from wastewater. The effects of precursor concentrations in gel precipitation process over the pore size and surface area of MGA were investigated in detail. The phosphate removal by prepared MGAs were rigorously investigated through adsorption isotherms and kinetics of phosphate.

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18

Mohd. "Isolation of Nitrate and Phosphate Removing Bacteria from Various Environmental Sites." OnLine Journal of Biological Sciences 12, no. 2 (February 1, 2012): 62–71. http://dx.doi.org/10.3844/ojbsci.2012.62.71.

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19

Liu, Yan, Tong Zhang, and Herbert H. P. Fang. "Microbial community analysis and performance of a phosphate-removing activated sludge." Bioresource Technology 96, no. 11 (July 2005): 1205–14. http://dx.doi.org/10.1016/j.biortech.2004.11.003.

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20

Thi Hue, Nguyen, and Nguyen Hoang Tung. "Study about Doping Ion La3+ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater." Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4893835.

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Lanthanum has been doped onto the surface of the natural Pyrolusite for simultaneous removal of phosphate and fluoride in aqueous solution. The adsorbent characterization of the materials was observed by the SEM, BET, and XRD techniques. The dynamics and isotherms models of fluoride and phosphate adsorption, with respect to pH, pHPZC, adsorbent dose, and effect of coexisting ions, were studied. The results showed that lanthanum doped Pyrolusite ore (LDPO) relatively highly adsorbed amount of phosphate and fluoride from aqueous solution. Phosphate and fluoride removal efficiencies of LDPO are approximately 97% and 95%, respectively. Pseudo-first order for kinetic studies of phosphate and fluoride removal of the LDPO was observed with high correlations for fluoride but weak correlations for phosphate. However, pseudo-second order for kinetic studies was high correlation for both phosphate and fluoride. The phosphate and fluoride adsorption capacities of the LDPO significantly decreased with the existence of coions (sulfate, chloride, and nitrate) in the aqueous solution.

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21

Fang, Liping, Lizhi Huang, Peter E. Holm, Xiaofang Yang, Hans Christian B. Hansen, and Dongsheng Wang. "Facile upscaled synthesis of layered iron oxide nanosheets and their application in phosphate removal." Journal of Materials Chemistry A 3, no. 14 (2015): 7505–12. http://dx.doi.org/10.1039/c4ta07083f.

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22

van Heerden, J., M. M. Ehlers, and T. E. Cloete. "Biolog for the determination of microbial diversity in activated sludge systems." Water Science and Technology 43, no. 1 (January 1, 2001): 83–90. http://dx.doi.org/10.2166/wst.2001.0020.

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In this study, different carbon source profiles were generated by inoculating Biolog GN microwell plates, with different dilutions of microbial communities from a number of activated sludge systems. This led to the successful generation of patterns reflecting diversity and evenness in the different systems. The high number of substrates utilized at the lower dilutions (10–1 and 10–2) indicated a high microbial diversity in the community, but not necessarily evenness of each species. Evenness of each species was reflected upon further dilution. Our results indicated differences in the microbial community composition amongst some of the activated sludge systems studied. These differences were not specifically related to phosphate removing and non phosphate removing systems.

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23

Sarvajith, M., and Y. V. Nancharaiah. "Granulation of the autochthonous planktonic bacterial community of seawater for saline wastewater treatment." Environmental Science: Water Research & Technology 6, no. 7 (2020): 1902–16. http://dx.doi.org/10.1039/d0ew00373e.

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Aerobic granular sludge was cultivated from the halophilic bacterial community of seawater. This strategy utilized autochthonous bacteria for effectively removing nitrogen and phosphate from saline wastewaters.

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24

Hong, Seung-Hee, Akem Michael Ndingwan, Soo-Cheul Yoo, Chang-Gu Lee, and Seong-Jik Park. "Use of calcined sepiolite in removing phosphate from water and returning phosphate to soil as phosphorus fertilizer." Journal of Environmental Management 270 (September 2020): 110817. http://dx.doi.org/10.1016/j.jenvman.2020.110817.

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25

Li, Wei-Qi, Duan Liu, Ji-Yan Qu, and Jian-Hong Luo. "Hydrothermal synthesis of a novel nanolayered tin phosphate for removing Cr(iii)." RSC Advances 11, no. 6 (2021): 3202–8. http://dx.doi.org/10.1039/d0ra08775k.

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In this work, an outstanding nanolayered tin phosphate with 15.0 Å interlayer spacing, Sn (HPO₄)₂·3H₂O (SnP–H⁺), has been synthesized by conventional hydrothermal method and first used in the adsorptive removal of Cr(iii) from aqueous solution.

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26

Sakakibara, Y., and H. Nakajima. "Phosphate removal and recovery by a novel electrolytic process." Water Science and Technology 46, no. 11-12 (December 1, 2002): 147–52. http://dx.doi.org/10.2166/wst.2002.0730.

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The possibility of removing and recovering phosphate from wastewater by a novel electrolytic process was investigated experimentally. In the process, ion electrodes are immersed in synthetic wastewater and direct current (DC) is applied to coagulate phosphate on the surface of the anode. Experimental results demonstrated that at electric current densities ranged from 0.001 to 0.1 mA/cm2, phosphate was removed and recovered as phosphate-rich aggregates formed on the anode surface. Decreases in phosphate concentration at bulk liquid were in fairly good agreement with the amounts of phosphate in the aggregates. Moreover, the removal rate of phosphate was increased with increasing electric current. In addition, as heavy metal anions such as Cu2+ deposit on the counter electrode (cathode), it was thought that relatively pure phosphate could be obtained by the present process.

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27

Gupta, Susmita Sen, and Krishna G. Bhattacharyya. "Using Aqueous Kaolinite Suspension as a Medium for Removing Phosphate from Water." Adsorption Science & Technology 30, no. 6 (June 2012): 533–47. http://dx.doi.org/10.1260/0263-6174.30.6.533.

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28

Khan, M. A., H. Satoh, T. Mino, H. Katayama, F. Kurisu, and T. Matsuo. "Bacteriophage-host interaction in the enhanced biological phosphate removing activated sludge system." Water Science and Technology 46, no. 1-2 (July 1, 2002): 39–43. http://dx.doi.org/10.2166/wst.2002.0453.

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Bacteriophages were isolated from a laboratory scale enhanced biological phosphate removing (EBPR) activated sludge process, and their host range was examined. Bacterial isolates to host the bacteriophages were isolated from the EBPR activated sludge process. Bacteriophages were eluted from the EBPR activated sludge, enriched by incubation with the bacterial isolates, and then tested for plaque formation on each of the bacterial isolates. Out of 12 bacterial isolates isolated, 4 supported plaque formation. Four bacteriophages were obtained from the plaques. The host range test was conducted with the combination of the bacteriophage isolates and the bacterial isolates. Three of the bacteriophages were found to form plaques on more than one host, and one of them formed plaques on both Gram +ve and Gram −ve bacterial isolates. Two of the four bacteriophages failed to form plaques on their original bacterial host, indicating the existence of mutation on either both or one of the host and the bacteriophage. This study strongly suggests that bacteriophages are an active part of the activated sludge microbial ecosystem, having very complex interaction with their host bacteria.

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29

Anjali, P. Sasidharan, V. Meera, and P. Raphael Vinod. "Efficacy of nanochitosan impregnated polyurethane foam in removing phosphate from aqueous solutions." IOP Conference Series: Materials Science and Engineering 1114, no. 1 (March 1, 2021): 012083. http://dx.doi.org/10.1088/1757-899x/1114/1/012083.

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30

Wang, Yu, Xiao Qing Dong, Bao Hua Zhou, and Zhi Bing Xu. "Effect of Oxalic Acid on the Adsorption of Fluoride by Phosphate Rock from Aqueous Solution." Advanced Materials Research 610-613 (December 2012): 390–93. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.390.

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The defluoridation capacity of phosphate rock in the presence of oxalic acid was investigated using batch experiments. Defluoridation capacity of phosphate rock was enhanced in the presence of oxalic acid, removing ﬂuoride from 22.46% up to 57.98% with 2.5 mmol/L oxalic acid. The contact time and pH for maximum ﬂuoride uptake were found 2 h and 5, respectively. Maximum adsorption capacity (0.36 mg/g) of ﬂuoride on phosphate rock was observed at 50 mg/L initial ﬂuoride concentration using 2 g adsorbent dose.

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31

Buzetzky, Dóra, Noémi M. Nagy, and József Kónya. "Use of La-, Ce-, Y-, Fe- bentonites for Removing Phosphate Ions from Aqueous Media." Periodica Polytechnica Chemical Engineering 61, no. 1 (January 13, 2017): 27. http://dx.doi.org/10.3311/ppch.9871.

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Clays play an important role in the environment. By removing cations and anions either through ion exchange, adsorption and precipitation, or all these combined, they can act as natural decontaminating agents of numerous pollutants. In this study, four modified bentonites (La-, Ce-, Y-, Fe-bentonite) were prepared and characterized, and their phosphate sorption capabilities were measured in batch experiments. Equilibrium times were also examined. The activation energy of the sorption process was calculated. The La- , Ce- and Y-bentonite can bind similar amount of phosphate ions, while iron-bentonite can bind only half of it compared to La-, Ce- and Y-bentonite.

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32

Nomura, Ryousuke, Takahiro Mori, Eiji Kanezaki, and Tomoki Yabutani. "Removal of Phosphate in Water to Layered Double Hydroxide." International Journal of Modern Physics B 17, no. 08n09 (April 10, 2003): 1458–63. http://dx.doi.org/10.1142/s0217979203019150.

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Layered double hydroxide (LDH) has been used to remove phosphate ion in water as an effective adsorbent of this anion at low concentration. LDH which contains Mg2+ and Al3+ as divalent and trivalent metals respectively was prepared as has been published by many authors. A fixed portion of this LDH was suspended in the weakly basic solution containing phosphate. The suspension was stirred moderately followed by filtration. The concentration of phosphate ion in the filtrate was determined by the molybdenum blue method. The result indicates that the LDH used in this experiment was effective in removing phosphate from water. Furthermore, it was also certified that the phosphate anions removed from water were quantitatively transferred onto the solid of LDH.

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33

Guimaraes, F. P., R. Aguiar, J. A. Oliveira, J. A. A. Silva, and D. Karam. "Potential of macrophyte for removing arsenic from aqueous solution." Planta Daninha 30, no. 4 (December 2012): 683–96. http://dx.doi.org/10.1590/s0100-83582012000400001.

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The potential of three aquatic macrophytes, Azoll caroliniana, Salvinia minima and Lemna gibba, was evaluated in this work aimed at selection of plants to be used in remediation of environments contaminated by arsenic (As). The experiments were carried out in a greenhouse during six days in pots containing Hoagland solution (¼ ionic strength) at As concentrations of 0.5; 2.5 and 5.0 mg L-1. The three species showed greater As accumulation as the concentration of the metalloid in solution increased. However, a reduction was detected in fresh and dry mass gain when the plants were exposed to high As concentrations. The macrophytes showed differences in efficiency of removal of As in solution. A. caroliniana, S. minima and L. gibba accumulated, on average, 0.130; 0.200; and 1.397 mg mDM-1, respectively, when exposed to 5.0 mg L-1 of As. The macrophytes absorbed a greater quantity of As in solution with low phosphate content. The greater As concentration in L. gibba tissues lowered the chlorophyll and carotenoid contents as shown by the high chlorosis incidence. Lemna gibba also exhibited a decrease in leaf size, with the total chlorophyll and carotenoid synthesis not being affected by As in A. caroliniana. This species exhibited purplish leaves with high concentration of anthocyanin, whose presence suggested association to phosphate deficiency. Marginal necrosis occurred on S. minima floating leaves, with the released daughter-plants not showing any visual symptoms during the treatment. The percentage of As removed from the solution decreased when the plants were exposed to high concentrations of the pollutant. Among the three species studied, only L. gibba could be considered an As hyper-accumulator. The use of this plant species for remediation of aquatic environments was shown to be limited and requires further investigation.

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34

FORTPIED, Juliette, Rita GEMAYEL, Vincent STROOBANT, and Emile van SCHAFTINGEN. "Plant ribulosamine/erythrulosamine 3-kinase, a putative protein-repair enzyme." Biochemical Journal 388, no. 3 (June 7, 2005): 795–802. http://dx.doi.org/10.1042/bj20041976.

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FN3K (fructosamine 3-kinase) is a mammalian enzyme that catalyses the phosphorylation of fructosamines, which thereby becomes unstable and detaches from proteins. The homologous mammalian enzyme, FN3K-RP (FN3K-related protein), does not phosphorylate fructosamines but ribulosamines, which are probably formed through a spontaneous reaction of amines with ribose 5-phosphate, an intermediate of the pentose–phosphate pathway and the Calvin cycle. We show in the present study that spinach leaf extracts display a substantial ribulosamine kinase activity (approx. 700 times higher than the specific activity of FN3K in erythrocytes). The ribulosamine kinase was purified approx. 400 times and shown to phosphorylate ribulose-ε-lysine, protein-bound ribulosamines and also, with higher affinity, erythrulose-ε-lysine and protein-bound erythrulosamines. Evidence is presented for the fact that the third carbon of the sugar portion is phosphorylated by this enzyme and that this leads to the formation of unstable compounds decomposing with half-lives of approx. 30 min at 37 °C (ribulosamine 3-phosphates) and 5 min at 30 °C (erythrulosamine 3-phosphates). This decomposition results in the formation of a 2-oxo-3-deoxyaldose and inorganic phosphate, with regeneration of the free amino group. The Arabidopsis thaliana homologue of FN3K/FN3K-RP was overexpressed in Escherichia coli and shown to have properties similar to those of the enzyme purified from spinach leaves. These results indicate that the plant FN3K/FN3K-RP homologue, which appears to be targeted to the chloroplast in many species, is a ribulosamine/erythrulosamine 3-kinase. This enzyme may participate in a protein deglycation process removing Amadori products derived from ribose 5-phosphate and erythrose 4-phosphate, two Calvin cycle intermediates that are potent glycating agents.

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35

Eltaweil, Abdelazeem S., Eman M. Abd El-Monaem, Hala M. Elshishini, Hisham G. El-Aqapa, Mohamed Hosny, Ahmed M. Abdelfatah, Maha S. Ahmed, et al. "Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review." RSC Advances 12, no. 13 (2022): 8228–48. http://dx.doi.org/10.1039/d1ra09193j.

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36

Wysocka, Izabela. "Wastewater parameters after the process of phosphorus compounds removal by the metal dissolution method in comparison with precipitation and electrocoagulation methods." Ochrona Srodowiska i Zasobów Naturalnych 28, no. 1 (March 1, 2017): 8–13. http://dx.doi.org/10.1515/oszn-2017-0001.

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Abstract Precipitation methods are commonly used for removing phosphorus compounds from wastewater. Chemical precipitation method, based on adding iron, aluminium or calcium salts to the treated wastewater, is often used. Another possible way of precipitating phosphates is metal dissolution method, which is presented in this paper. The main difference between these two methods is how the phosphate precipitating ions are introduced to the wastewater. This paper discusses advantages and disadvantages of the metal dissolution method in comparison with traditional precipitation methods. Differences in the secondary contamination of treated wastewater by iron ions, conductivity, total alkalinity and pH correction process; the use of recyclable wastes; and energy consumption are discussed.

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37

Benredjem, Zahia, Rachid Delimi, and Assia Khelalfa. "Phosphate ore washing by Na2EDTA for cadmium removal: Optimization of the operating conditions." Polish Journal of Chemical Technology 14, no. 3 (October 1, 2012): 15–20. http://dx.doi.org/10.2478/v10026-012-0079-0.

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This paper discusses the extraction of cadmium from phosphate ore by the washing method. Various parameters were investigated for the cadmium extraction from phosphate ore. The results from extraction tests showed that cadmium extraction depends on the nature and concentration of the extracting agent, the liquid/phosphate ore ratio, the temperature and the solution pH. The effi ciency of the nine extracting agents for removing cadmium from phosphate ore was found to be in the order: Na2EDTA > citric acid > tartric acid > ammonium citrate > calcium chloride > ammonium acetate > ammonium chloride > oxalic acid > ammonium hydroxide. In this study cadmium extraction kinetics was best described by the product layer diffusion control model.

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38

Drizo, A., C. A. Frost, J. Grace, and K. A. Smith. "Physico-chemical screening of phosphate-removing substrates for use in constructed wetland systems." Water Research 33, no. 17 (December 1999): 3595–602. http://dx.doi.org/10.1016/s0043-1354(99)00082-2.

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39

Gieseke, Armin, Ulrike Purkhold, Michael Wagner, Rudolf Amann, and Andreas Schramm. "Community Structure and Activity Dynamics of Nitrifying Bacteria in a Phosphate-Removing Biofilm." Applied and Environmental Microbiology 67, no. 3 (March 1, 2001): 1351–62. http://dx.doi.org/10.1128/aem.67.3.1351-1362.2001.

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ABSTRACT The microbial community structure and activity dynamics of a phosphate-removing biofilm from a sequencing batch biofilm reactor were investigated with special focus on the nitrifying community. O2, NO2 −, and NO3 − profiles in the biofilm were measured with microsensors at various times during the nonaerated-aerated reactor cycle. In the aeration period, nitrification was oxygen limited and restricted to the first 200 μm at the biofilm surface. Additionally, a delayed onset of nitrification after the start of the aeration was observed. Nitrate accumulating in the biofilm in this period was denitrified during the nonaeration period of the next reactor cycle. Fluorescence in situ hybridization (FISH) revealed three distinct ammonia-oxidizing populations, related to theNitrosomonas europaea, Nitrosomonas oligotropha, andNitrosomonas communis lineages. This was confirmed by analysis of the genes coding for 16S rRNA and for ammonia monooxygenase (amoA). Based upon these results, a new 16S rRNA-targeted oligonucleotide probe specific for theNitrosomonas oligotropha lineage was designed. FISH analysis revealed that the first 100 μm at the biofilm surface was dominated by members of the N. europaea and theN. oligotropha lineages, with a minor fraction related to N. communis. In deeper biofilm layers, exclusively members of the N. oligotropha lineage were found. This separation in space and a potential separation of activities in time are suggested as mechanisms that allow coexistence of the different ammonia-oxidizing populations. Nitrite-oxidizing bacteria belonged exclusively to the genus Nitrospira and could be assigned to a 16S rRNA sequence cluster also found in other sequencing batch systems.

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40

Benredjem, Zahia, Rachid Delimi, Assia Khelalfa, Samia Saaidia, and Ahmed Mehellou. "Coupling of electrodialysis and leaching processes for removing of cadmium from phosphate ore." Separation Science and Technology 51, no. 4 (December 16, 2015): 718–26. http://dx.doi.org/10.1080/01496395.2015.1119842.

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41

Safin, D. Kh, R. R. Sharifullin, and N. S. Gabdulkhakova. "Specific features of using phosphate adsorption method for removing base catalyst from polyethers." Russian Journal of Applied Chemistry 83, no. 9 (September 2010): 1653–56. http://dx.doi.org/10.1134/s1070427210090260.

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42

Wang, Zhen, Jian Dong, Lin Liu, Gefu Zhu, and Chaoxiang Liu. "Screening of phosphate-removing substrates for use in constructed wetlands treating swine wastewater." Ecological Engineering 54 (May 2013): 57–65. http://dx.doi.org/10.1016/j.ecoleng.2013.01.017.

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43

Keyikoglu, Ramazan, Alireza Khataee, and Yeojoon Yoon. "Layered double hydroxides for removing and recovering phosphate: Recent advances and future directions." Advances in Colloid and Interface Science 300 (February 2022): 102598. http://dx.doi.org/10.1016/j.cis.2021.102598.

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44

Comeau, Yves, Kenneth J. Hall, and William K. Oldham. "Indirect Polyphosphate Quantification in Activated Sludge." Water Quality Research Journal 25, no. 2 (May 1, 1990): 161–74. http://dx.doi.org/10.2166/wqrj.1990.009.

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Abstract An indirect biological method is presented to quantify the amount of polyphosphates in activated sludge obtained from wastewater treatment plants removing phosphate biologically. The method is based upon the property of such sludges to degrade polyphosphate reserves under anaerobic conditions as a result of acetate addition thereby releasing inorganic phosphate into solution. The addition of an excess of acetate ensures the consumption of any oxygen and nitrate, and the depletion of intracellular polyphosphates available for acetate storage. Thus, this new method offers a much easier approach than those previously available to quantify polyphosphate, one of the two storage polymers involved in the mechanism of biological phosphate removal.

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45

Bond, Philip L., Robert Erhart, Michael Wagner, Jürg Keller, and Linda L. Blackall. "Identification of Some of the Major Groups of Bacteria in Efficient and Nonefficient Biological Phosphorus Removal Activated Sludge Systems." Applied and Environmental Microbiology 65, no. 9 (September 1, 1999): 4077–84. http://dx.doi.org/10.1128/aem.65.9.4077-4084.1999.

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ABSTRACT To investigate the bacteria that are important to phosphorus (P) removal in activated sludge, microbial populations were analyzed during the operation of a laboratory-scale reactor with various P removal performances. The bacterial population structure, analyzed by fluorescence in situ hybridization (FISH) with oligonucleotides probes complementary to regions of the 16S and 23S rRNAs, was associated with the P removal performance of the reactor. At one stage of the reactor operation, chemical characterization revealed that extremely poor P removal was occurring. However, like in typical P-removing sludges, complete anaerobic uptake of the carbon substrate occurred. Bacteria inhibiting P removal overwhelmed the reactor, and according to FISH, bacteria of the β subclass of the class Proteobacteria other than β-1 or β-2 were dominant in the sludge (58% of the population). Changes made to the operation of the reactor led to the development of a biomass population with an extremely good P removal capacity. The biochemical transformations observed in this sludge were characteristic of typical P-removing activated sludge. The microbial population analysis of the P-removing sludge indicated that bacteria of the β-2 subclass of the class Proteobacteria and actinobacteria were dominant (55 and 35%, respectively), therefore implicating bacteria from these groups in high-performance P removal. The changes in operation that led to the improved performance of the reactor included allowing the pH to rise during the anaerobic period, which promoted anaerobic phosphate release and possibly caused selection against non-phosphate-removing bacteria.

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46

Zhao, Li Li, Yong Zhu Yang, Miao Zhang, Yang Wei Li, and Ying Xiang Jiang. "Preparation and Characterization of Phosphorus Removal Agent by Lanthanum-Copper Composite Oxide." Advanced Materials Research 887-888 (February 2014): 26–31. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.26.

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Lanthanum-copper Composite Oxide Compounds were prepared from lanthanum chloride (LaCl3) and copper chloride (CuCl2), and used sodium hydroxide (NaOH) as precipitating agent. The research results showed that: the best preparation condition, which is the copper content3%;water bath temperature,70°C; agitation time,2 hours; calcination temperature,400°C; calcination time,1hour.The adsorption capacity of adsorbent was 63.88mg/g in this state. Analysis results indicate that Copper-doped crystal form dense granule in favour of phosphate adsorption .And La2O3is very important on removing the phosphate.

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47

Bianchi, M. L., A. Bettinelli, L. Soldati, A. Saccaggi, S. Ortolani, and A. Edefonti. "Mineral Metabolism during a Hemofiltration Session in Children." International Journal of Artificial Organs 9, no. 4 (July 1986): 257–62. http://dx.doi.org/10.1177/039139888600900410.

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We studied the effects of one session of hemofiltration on the mineral metabolism in a group of uremic children. We observed an increase of calcemia, accompained by positive calcium balance, and a decrease of plasma phosphate and PTH-MM. No substantial loss of plasma 25-OH D was found. It is concluded that hemofiltration has a positive effect on calcemia and is very effective in removing phosphate, but it acts only temporarily on PTH removal. An adequate calcium concentration must be provided in the substitution fluid.

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48

Brangule, Agnese, and Kārlis Gross. "Effect on Drying Conditions on Amorphous Calcium Phosphate." Key Engineering Materials 631 (November 2014): 99–103. http://dx.doi.org/10.4028/www.scientific.net/kem.631.99.

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Amorphous calcium phosphate (ACP) plays an important role in the body and can be used as an intermediate phase for forming calcium phosphates. All ACPs are thermodynamically unstable compounds, unless stored in dry conditions or at low temperature (-18oC), and spontaneously undergo transformation to crystalline calcium phosphates (CaP). This work will investigate the influence of drying on the stability of ACP. ACPs powders were prepared by wet synthesis; mixing solution made of Ca (NO3)2∙4H2O and 30% ammonia with (NH4)2HPO4 and (NH4)2CO3 solution at room temperature. The suspension was stirred, filtered and washed several times with deionized water containing ammonia. ACP samples were dried at different conditions and with different drying agents (DA). XRD and FTIR spectra showed poorly crystallinity powders after drying. Some FTIR spectra indicated residual organic compounds from drying. The Rietveld’s method and Schrrer’s relationship estimated the particle size (0.5 – 20 nm) of ACP. Thermogravimetry (TG) revealed that the moisture (7% – 25%) is released upon drying, and the drying agents have no significant effect on. The drying methods are ordered to show which the most effective for removing moisture. By changing the drying conditions, it is a possible to obtain poorly crystalline ACPs with different particle size and moisture content.

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49

Brodisch, Karin E. U. "Interaction of Different Groups of Micro-Organisms in Biological Phosphate Removal." Water Science and Technology 17, no. 11-12 (November 1, 1985): 89–97. http://dx.doi.org/10.2166/wst.1985.0223.

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Observations under continuous flow conditions in a bench-scale activated sludge unit and in full-scale nutrient removal activated sludge plants indicated that, despite relatively high numbers of Aoinetobaoter oalooaoetious, no enhanced biological phosphate removal was achieved. Total bacteriological analyses of the mixed liquor of these plants indicated that in all cases Aeromonas spp. were present in low numbers, particularly Aeromonas punotata. This bacterium is described as being able to produce acetate as one of its major fermentation end products. Phosphate uptake batch experiments using pure cultures showed that Aeromonas punotata enhances the phosphate uptake capability of Aoinetobaoter calooaoetious by converting carbohydrates present in the sewage to a substrate required for phosphate removal. It was shown that the anaerobic zone in a phosphate removing activated sludge plant is a fermentation reactor, where suitable substrates are generated rather than stress conditions imposed on the bacteria, a condition which was previously believed to be essential for enhanced phosphate uptake.

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50

Shi, Hoi-Ping, and Chi-Mei Lee. "Phosphate removal under denitrifying conditions byBrachymonassp. strain P12 andParacoccus denitrificansPP15." Canadian Journal of Microbiology 53, no. 6 (June 2007): 727–37. http://dx.doi.org/10.1139/w07-026.

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In this study, we used the denitrifying phosphorus-removing bacterium Brachymonas sp. strain P12 to investigate the enhanced biologic phosphorus-removal (EBPR) mechanism involved with polyhydroxybutyrate (PHB), glycogen, and phosphorus uptake in the presence of acetate under anoxic or aerobic conditions. The results showed that excess acetate concentration and aerobic cultivation can enhance PHB formation efficiency and that PHB formation might be stimulated by glycogenolysis of the cellular glycogen. The efficiency of the uptake of anoxic phosphorus was greater when PHB production was lower. The EBPR mechanism of Brachymonas sp. strain P12 for PHB, phosphorus, and glycogen was similar to the conventional anaerobic–aerobic (or anaerobic–anoxic) EBPR models, but these models were developed under anoxic or aerobic conditions only, without an anaerobic stage. The anoxic or aerobic log phase of growth is divided into two main phases: the early log phase, in which acetate and glycogen are consumed to supply enough energy and reducing power for PHB formation and cell growth (phosphorus assimilation), and the late log phase, which ends the simultaneous degradation of PHB and remaining acetate for polyphosphate accumulation. Glycogenolysis plays a significant role in the alternate responses between PHB formation and phosphorus uptake under anoxic or aerobic conditions. After the application of the denitrifying phosphorus-removing bacterium Brachymonas sp. strain P12, aerobic cultivation increases the level of PHB production, and anoxic cultivation further increases phosphorus uptake.

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