Gotowe bibliografie tematyczne / Iron removal

Gotowa bibliografia na temat „Iron removal”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 28 lutego 2023

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Artykuły w czasopismach na temat "Iron removal"

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Matsiyevska, Oksana, Iryna Kachmar i Vladyslav Kapitula. "EFFICIENCY OF IRON REMOVAL FROM DRINKINGWATER WITH HOUSEHOLD FILTERS". Theory and Building Practice 2020, nr 1 (15.06.2020): 81–87. http://dx.doi.org/10.23939/jtbp2020.01.081.

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Holm, Thomas R., Walton R. Kelly, Steven D. Wilson i Jonathan L. Talbott. "Arsenic removal at llinois iron removal plants". Journal - American Water Works Association 100, nr 9 (wrzesień 2008): 139–50. http://dx.doi.org/10.1002/j.1551-8833.2008.tb09727.x.

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Morosini, Denise Fontoura, Carlos Adolpho Magalhães Baltar i Antonio Carlos Duarte-Coelho. "Iron removal by precipitate flotation". Rem: Revista Escola de Minas 67, nr 2 (czerwiec 2014): 203–7. http://dx.doi.org/10.1590/s0370-44672014000200012.

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The water from several artesian wells in the metropolitan area of Recife presents high iron content, preventing its use in some industrial processes. The possibility of removing the iron by the use of precipitate flotation using sodium dodecyl sulphate (SDS) as collector was studied. The tests were carried out in a glass column 65 cm high, fed by a constant airflow. At pH 8, where the isoelectric point of colloidal iron hydroxide [Fe(OH)3] was observed, the size of the precipitate increases with conditioning time and facilitates the removal of iron ions by flotation. The results showed that an increase in conditioning time, from 5 to 20 minutes, resulted in a reduction of the residual concentration of iron from 13.2 to 0.2 ppm. The decrease in precipitate specific surface area rendered a decrease in the collector consumption possible. The iron ion removal process by flotation using SDS as collector was shown to be quite efficient. A removal of 99% of Fe3+ contained in the original solution was obtained.
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Tong, Dongli, Jie Zhuang i Xijuan Chen. "Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media". Water 11, nr 7 (26.06.2019): 1316. http://dx.doi.org/10.3390/w11071316.

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Agricultural nonpoint pollution has been recognized as a primary source of nutrients and pesticides that contaminate surface water and groundwater. Reactive materials have great potential to remove nutrients and pesticides from agricultural drainage water. In this study, we investigated the reactive transport and removal of coexisting nitrate, phosphate, and three pesticides (tricyclazole, isoprothiolane, and malathion) by iron filings and natural ore limestone through column experiments under saturated flow conditions. Breakthrough results showed that 45.0% and 35.8% of nitrate were removed by iron filings and limestone during transport, with average removal capacities of 2670 mg/kg and 1400 mg/kg, respectively. The removal of nitrate was mainly due to microbial denitrification especially after 131–154 pore volumes (≈30 d), whereas reduction to ammonia dominated nitrate removal in iron filings during early phase (i.e., <21.7 d). The results showed that 68.2% and 17.6% of phosphate were removed by iron filings and limestone, with average removal capacities of 416.1 mg/kg and 155.2 mg/kg, respectively. Mineral surface analyses using X-ray diffraction (XRD) and scanning electron microscope (SEM) coupled with energy-dispersive X-ray analysis (EDX) suggested that ligand exchange, chemical precipitation, and electrostatic attraction were responsible for phosphate removal. Chemical sorption was the main mechanism that caused removals of 91.6–100% of malathion and ≈27% of isoprothiolane in iron filings and limestone. However, only 22.0% and 1.1% of tricycalzole were removed by iron filings and limestone, respectively, suggesting that the removal might be relevant to the nonpolarity of tricyclazole. This study demonstrates the great potential of industrial wastes for concurrent removal of nutrients and pesticides under flow conditions.
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Munter, Rein, Heldi Ojaste i Johannes Sutt. "Complexed Iron Removal from Groundwater". Journal of Environmental Engineering 131, nr 7 (lipiec 2005): 1014–20. http://dx.doi.org/10.1061/(asce)0733-9372(2005)131:7(1014).

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Jalili, Zahra, Ataallah Bahrami, Masoud Ghadri, Behzad Nemati Akhgar i Fatemeh Kazemi. "Leaching for iron removal from low-grade bauxite ore to access refractory instruction". Rudarsko-geološko-naftni zbornik 37, nr 1 (2022): 55–64. http://dx.doi.org/10.17794/rgn.2022.1.6.

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Iron-bearing minerals are the most important interfering compounds that are found with bauxite reserves. The element iron has adverse effects on bauxite applications, including the use of bauxite in refractory soils. The purpose of this research is to investigate the possibility of iron removal from low-grade bauxite ores to utilize them in refractory industries. For achieving this purpose, iron removal tests were performed on bauxite samples with an alumina to silica modulus of 0.73. After determining the appropriate iron removal method among the magnetic separation, calcination, and leaching (with H2SO4 and HCl) processes, optimal separation conditions were determined by tests that were designed using the Taguchi method. According to leaching results, using HCl for raw feed (un-calcined) provided the best result for iron removal. During this test, Fe2O3 grade decreased from 5.14% to 0.08%, and the alumina to silica modulus increased to 0.75. Calcination of the concentrate obtained from this test has led to favorable results in reducing the Fe2O3 grade (0.04%) and increasing the Al2O3 grade. Afterwards, in tests designed by the Taguchi method, the effect of parameters such as time, process temperature, HCl concentration, and feed grain size on iron removal from bauxite by HCl leaching processes are discussed. According to the results, the best efficiency of iron removal for a feed grain size of 250 µm is achieved in the following conditions: 30% HCl, process temperature of 25°C, and process time of 120 minutes. In this case, iron removal efficiency and Fe2O3 grade in process concentrate are 92.78% and 0.56%, respectively.
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Viswanathan, M. N., i B. Boettcher. "Biological Removal of Iron from Groundwater". Water Science and Technology 23, nr 7-9 (1.04.1991): 1437–46. http://dx.doi.org/10.2166/wst.1991.0596.

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Host of the soluble iron in groundwater exists in complexes with organic matter. Removal of iron, complexed with organic matter, is difficult and requires the use of a strong oxidant such as ozone, chlorine, etc. This increases capital and operating costs of water treatment plants. Iron oxidizing bacteria like Gallionellaferruginea are known to oxidize iron and derive the energy for the reduction of CO2. A biological reactor was developed, based on these principles, to remove iron from groundwater. The reactor was successful in reducing iron levels in groundwater from 2.5-3.0 mg/l to about 0.1 mg/l. It was observed that, apart from Gallionellaferruginea, Sphaerotilus spp. were also present in the reactor column. No major problems with respect to clogging of filters or the reactor column were experienced.
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M, Takahashi. "Arsenic Removal Using a Simple Oxidation Device". Open Access Journal of Waste Management & Xenobiotics 4, nr 1 (26.01.2021): 1–4. http://dx.doi.org/10.23880/oajwx-16000158.

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Arsenic exists widely in the environment, and a lot of arsenic pollution is found in the groundwater of South East Asia. In order to make arsenic free water, we made a simple device. The device is mainly composed of an iron containing oxidation tank, settling tank and sand filter. The arsenic in the water can be removed by iron oxidation which is caused by aeration. The device can remove about 98% of the arsenic in the water using less energy, and be maintenance free for a long period.
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Mamun, Muhammad Rashed Al, i Shuichi Torii. "Removal of Hydrogen Sulfide (H2S) from Biogas Using Zero-Valent Iron". Journal of Clean Energy Technologies 3, nr 6 (2015): 428–32. http://dx.doi.org/10.7763/jocet.2015.v3.236.

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Wang, Zi, Zhe Chen, Hong Wu Wang i Lu Ming Ma. "Effect of Placement Pattern and Quantity of Iron Shavings in Reactor on Biological Nutrient Removal from Domestic Wastewater". Applied Mechanics and Materials 164 (kwiecień 2012): 186–89. http://dx.doi.org/10.4028/www.scientific.net/amm.164.186.

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Effect of placement pattern and quantity of iron shavings in reactor on biological nutrient Removal from domestic wastewater was conducted. The results indicate that: different placement pattern had obvious effect on TP removal, but had no distinct effect on TN removal; when iron was placed beside aerator, the highest TP removal can be obtained. Adding more iron can just slightly enhance TP and TN removal when iron shaving quantity increased from 5 g to 20 g per 900 ml wastewater; iron adding restrained transfer of ammonia to nitrate by microbe and this defect should be overcome in practice; 5 g iron per 900 mL is the best choice to balance good nutrient removal and low cost.
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Rozprawy doktorskie na temat "Iron removal"

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Leake, Thomas Russell. "Zinc removal using biogenic iron oxides". Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/T_Leake_120409.pdf.

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Thesis (M.S. in enviromental engineering)--Washington State University, December 2009.
Title from PDF title page (viewed on Jan. 28, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 27-31).
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Moridani, Majid Yousefi. "Hydroxpyridinone iron chelators". Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243728.

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Swarna, Anitha. "Removal of Arsenic Using Iron Coated Limestone". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1342.

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Arsenic contamination in drinking water is a severe problem worldwide. The best way to prevent hazardous diseases from chronic arsenic exposure is to remove the exposure. Efforts to remediate arsenic in drinking water have taken two tracks. One is to provide surface or shallow well water sources as an alternative to the arsenic contaminated deep wells. Another approach is to remove arsenic from the contaminated water. Different removal technologies like oxidation, chemical coagulation, precipitation, adsorption and others are available. There are problems and benefits associated with each of these approaches that can be related to cultural, socio-economic and engineering influences. The method proposed in this research is adsorption of arsenic to iron coated limestone. Different iron coated limestone samples were prepared. Standard solutions of 100ppb arsenic were prepared and batch and kinetic experiments were conducted. The final solution concentrations were analyzed by Graphite Furnace Atomic Adsorption Spectroscopy (GFAAs) and the results showed that iron coated limestone removed arsenic below 10ppb with 5 grams of material. Variations in iron coverage impacted efficiency of arsenic removal.
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Ahmed, F. "Low cost iron removal for handpump tubewells". Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382316.

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Almeelbi, Talal Bakheet. "Phosphate Removal and Recovery Using Iron Nanoparticles and Iron Cross-Linked Biopolymer". Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26517.

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Nanoscale zero-valent iron (NZVI) particles and iron cross-linked alginate (FCA) beads were successfully used for the first time for phosphate removal and recovery. NZVI was successfully used for phosphate removal and recovery. Batch studies indicated a removal of ~96 to 100% phosphate in 30 min (1, 5, and 10 mg PO43--P/L with 400 mg NZVI/L). Phosphate removal efficiency by NZVI was 13.9 times higher compared to Microscale ZVI (MZVI) particles. The successful rapid removal of phosphate by NZVI from aqueous solution is expected to have great ramification for cleaning up nutrient rich waters. The presence of sulfate, nitrate, and humic substances and the change in ionic strength in the water marginally affected phosphate removal by NZVI. A maximum phosphate recovery of ~78% was achieved in 30 min at pH 12. Novel iron cross-linked alginate (FCA) beads were synthesized, characterized and used for phosphate removal. The beads removed up to 37-100% phosphate from aqueous solution in 24 h. Freundlich isotherm was found to most closely fit with experimental data and the maximum adsorption capacity was found to be 14.77 mg/g of dry beads. The presence of chloride, bicarbonate, sulfate, nitrate, and natural organic matters in aqueous solution did not interfere in phosphate removal by FCA beads. The phosphate removal efficacy FCA beads was not affected due to change in pH (4-9). Nanosacle zero-valent iron (NZVI) and iron cross-linked alginate beads were also tested for phosphate removal using actual wastewater treatment plant effluent and animal feedlot runoff. The FCA beads could remove ~63% and ~77% phosphate from wastewater and feedlot runoff in 15 min, respectively. Bioavailability of phosphate was examined using algae and higher plants. Phosphate and iron bioavailability of the NZVI sorbed phosphate was examined by supplying spent particles (NZVI with sorbed phosphate) to Tyee Spinach (Spinacia oleracea) and algae (Selenastrum capricornutum). Results revealed that the phosphate was bioavailable for both the algae and spinach. Also, presence of the nanoparticles enhanced the algae growth and plant growth and increases in biomass and plant length were observed. Iron (from spent NZVI) was found to be bioavailable for spinach.
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Iatrou, Angela. "Removal of chlorite by reaction with ferrous iron". Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/42223.

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The use of chlorine dioxide as an oxidant and/or disinfectant for drinking water treatment has been an alternative considered when utilities seek to control trihalomethane concentrations. However, concern regarding residual concentrations of chlorite and chlorate have resulted in limitations on applied chlorine dioxide dosages. This study describes the use of ferrous iron as a possible reducing agent for the elimination of residual chlorite from drinking water.
Master of Science

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Cordray, Antoine. "Phosphorus removal characteristics on biogenic ferrous iron oxides". Pullman, Wash. : Washington State University, 2008. http://www.dissertations.wsu.edu/Thesis/Fall2008/a_cordray_111708.pdf.

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Thesis (M.S. in environmental engineering)--Washington State University, December 2008.
Title from PDF title page (viewed on Dec. 23, 2008). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 69-72).
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Xie, Li. "Factors and mechanisms controlling bromate removal by zerovalent iron /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20XIE.

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Isaeva, Margarita, i Castro Natasha Montes. "Water Treatment for the Removal of Iron and Manganese". Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5357.

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The purpose of the study is to find a suitable method for removal of iron and manganese considering local economic and environmental aspects. El Salvador is situated in Central America with a coast line towards the Pacific Ocean. The country borders Guatemala and Honduras. Aguilares is a town situated in the department of San Salvador, with a population of approximately 33,000 people. Currently, the population is provided with water for about two hours per day, since it is the highest capacity of the existing wells. During these two hours many households fill a small tank with water to use for the remainder of the day. The water is not safe to use for oral consumption because of the levels of bacteria and other contamination. One of the wells, situated in the community of Florída is not in use at this date because of the high levels of Iron and Manganese in the ground water which cannot be removed with the present technique.Ground water is naturally pure from bacteria at a depth of 30 m or more, however solved metals may occur and if the levels are too high the water is unsuitable to drink. The recommended maximum levels by WHO (2008) [1] for Iron and Manganese are 2 mg/l and 0.5 mg/l respectively.Literature and field studies led to the following results; Iron and manganese can be removed by precipitation followed by separation. Precipitation is achieved by aeration, oxygenation or chemical oxidation and separation is achieved by filtration or sedimentation.The different methods all have advantages and disadvantages. However the conclusion reached in this report is that aeration and filtration should be used in the case of Florída. What equipment and construction that should be used depends on economic and resource factors as well as water requirements, which is up to the council of Aguilares to deliberate.
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Vercellotti, Joseph M. "Kinetics of iron removal using potassium permanganate and ozone". Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182873479.

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Książki na temat "Iron removal"

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author, Tompeck Mark, red. Iron and manganese removal handbook. Denver, CO: American Water Works Association, 2015.

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Hermanson, Ronald E. The stainers--iron and manganese removal. [Pullman]: Cooperative Extension, Washington State University, 1991.

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Hermanson, Ronald E. The stainers--iron and manganese removal. [Pullman]: Cooperative Extension, Washington State University, 1991.

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Bruce, Robinson R., AWWA Research Foundation i American Water Works Association, red. Sequestering methods of iron and manganese treatment. Denver, CO: AWWA Research Foundation, 1990.

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Stowe, Ryan J. Arsenic removal from drinking water by iron removal: U.S. EPA demonstration project at Northeastern Elementary School in Fountain City, IN, final performance evaluation report. Cincinnati, Ohio: National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 2011.

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Knocke, William R. Impacts of dissolved organic carbon on iron removal. Denver, CO: The Foundation and American Water Works Association, 1993.

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Olthoff, Reinhold. Die Enteisenung und Entmanganung von Grundwasser im Aquifer. Hannover: Institut für Siedlungswasserwirtschaft und Abfalltechnik der Universität Hannover, 1986.

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Appleman, Bernard R. Lead-based paint removal for steel highway bridges. Washington, D.C: National Academy Press, 1997.

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Adams, R. C. Destruction and removal of POHCs in iron making blast furnaces. Cincinnati, OH: U.S. Environmental Protection Agency, Research and Development, Hazardous Waste Engineering Research Laboratory, 1988.

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McHerron, L. E. Iron removal in a simulated wetland for acid mine drainage treatment. S.l: s.n, 1987.

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Części książek na temat "Iron removal"

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Almeelbi, Talal, i Achintya Bezbaruah. "Aqueous phosphate removal using nanoscale zero-valent iron". W Nanotechnology for Sustainable Development, 197–210. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-05041-6_16.

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Taleb, Khadidja, Nadia Chekalil i Salima Saidi-Besbes. "Iron-Based Magnetic Nanoadsorbents for Organic Dye Removal". W Handbook of Magnetic Hybrid Nanoalloys and their Nanocomposites, 915–47. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90948-2_55.

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Zoecklein, Bruce W., Kenneth C. Fugelsang, Barry H. Gump i Fred S. Nury. "Removal of Copper and Iron — The Hubach Analysis". W Production Wine Analysis, 390–97. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8146-8_19.

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Taleb, Khadidja, Nadia Chekalil i Salima Saidi-Besbes. "Iron-Based Magnetic Nanoadsorbents for Organic Dye Removal". W Handbook of Magnetic Hybrid Nanoalloys and their Nanocomposites, 1–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-34007-0_55-1.

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Iskandar, Raja Hafizzuddin Raja Amir, Jalina Kassim, Mohd Fozi Ali i Amnorzahira Amir. "Removal of Lead by Nanoscale Zerovalent Iron in Surfacewater". W InCIEC 2015, 63–71. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0155-0_7.

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Devika, S. L., P. Nimitha, Venkatesh Muganur i S. Shrihari. "Removal of Dyes and Iron Using Eco-Friendly Adsorbents". W Climate Impacts on Water Resources in India, 233–42. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51427-3_20.

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García-Rosales, G., L. C. Longoria-Gándara, P. Avila-Pérez, D. O. Flores-Cruz i C. López-Reyes. "Biogenic Material With Iron Nanoparticles for As(V) Removal". W Plant Nanobionics, 55–75. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16379-2_3.

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Liao, Chih-Hsiang, Shyh-Fang Kang, Jin Anotai i Chalermchai Ruangchainikom. "Aqueous Nitrate Reduction by Zero-valent Iron Powder". W Zero-Valent Iron Reactive Materials for Hazardous Waste and Inorganics Removal, 77–94. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/9780784408810.ch06.

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Raymond, Kenneth N., i Barbara L. Bryan. "The Coordination Chemistry of Iron in Biological Transport and Storage; Iron Removal in Vivo". W Bioinorganic Chemistry, 13–24. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0255-1_2.

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Gui, Lai, Robert W. Gillham, Molly M. McGuire i D. Howard Fairbrother. "The Performance of Palladized Granular Iron: Enhancement and Deactivation". W Zero-Valent Iron Reactive Materials for Hazardous Waste and Inorganics Removal, 172–86. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/9780784408810.ch10.

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Streszczenia konferencji na temat "Iron removal"

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Xiang, Q., M. Schlesinger i J. Watson. "Red mud minimization by iron removal - Iron reduction". W The 8th International Mineral Processing Symposium. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.4324/9780203747117-25.

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Andrews, Jaron R. "ARSENIC REMOVAL USING IRON-MODIFIED ZEOLITES". W GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287328.

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Albrektienė, Ramunė, i Mindaugas Rimeika. "Efficiency of Removal of Iron, Manganese, Ammonium and Organic Matter from Groundwater". W Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.067.

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The acceptable concentrations in groundwater are usually in excess of iron, ammonium and manganese. These compounds are inefficiently removed by means of ordinary technologies of ammonium ions, iron and manganese compounds removal from groundwater (water aeration and filtration through granular filter fillings) where groundwater contains high concentrations of organic compounds. Increased concentrations of organic compounds in groundwater occur in well fields where exploited aquifers have contact with surface water wells and are supplemented with water from open water bodies. Such well field is located in the town of Nida (Lithuania). The norms permitted by Council directive 98/83/EC on the quality of water intended for human consumption are exceeded by iron, ammonium, manganese and organic compounds in this well field. The present study examines the efficiency of drinking water treatment technology of three-stage filtration with aeration and insertion of coagulant (polyaluminum chloride) where ammonium ions, iron, manganese and organic compounds are removed from groundwater in an integral manner. Three fillings were used for filtration: quartz sand, zeolite and quartz sand with oxidizing bacteria. The drinking water treatment technology examined removes ammonium ions, iron, manganese and organic compounds from groundwater in an integral manner until the requirements of the norms of directive 98/83/EC are achieved.
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Nasr-El-Din, H. A., i A. Y. Al-Humaidan. "Iron Sulfide Scale: Formation, Removal and Prevention". W International Symposium on Oilfield Scale. Society of Petroleum Engineers, 2001. http://dx.doi.org/10.2118/68315-ms.

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Elkatatny, Salaheldin. "New Formulation for Iron Sulfide Scale Removal". W SPE Middle East Oil & Gas Show and Conference. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/183914-ms.

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Gamal, Hany, Khaled Abdelgawad i Salaheldin Elkatatny. "New Environmentally Friendly Solution for Iron Scale Removal". W International Petroleum Technology Conference. International Petroleum Technology Conference, 2020. http://dx.doi.org/10.2523/iptc-19800-ms.

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Rentz, Jeremy A., i Jeffrey L. Ullman. "Copper and Zinc Removal Using Biogenic Iron Oxides". W World Environmental And Water Resources Congress 2012. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412312.072.

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Ramachandran, Uma, i Shobana Ganesan. "Studying Arsenic Removal using Nanoscale Zero-valent Iron". W 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_093.

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Heang, Sorphea, Ramunė Albrektienė i Dainius Paliulis. "Investigation of Lead and Iron Removal from Groundwater Using Sapropel and Quartz Sand". W 11th International Conference “Environmental Engineering”. VGTU Technika, 2020. http://dx.doi.org/10.3846/enviro.2020.737.

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In Prey Nop district of Cambodia, a district in coastal area, it was observed that concentration of iron and lead in groundwater was higher than permissible values. Lead is a highly toxic heavy metal, while iron is an element causing several problems related to the deterioration of taste and aesthetic appearance of water and the capacity reduction of water supply pipelines. Therefore, this article investigates the effectiveness of the technology for removing lead and iron from groundwater using the cheapest materials like sapropel and sand. In this study, different doses of sapropel (0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1, 2, 3, 4, 5 and 6 g/L), different durations of sorption processes (30, 60, 90, 120 and 150 min) and a laboratory bench for iron filtration filled with quartz sand were used for lead and iron ions removal. Results from the bench tests showed that both iron and lead were removed at efficiencies of 70 and 97%, and their concentrations did not exceed the permissible levels by using the lowest dose of 0.1 g/L of sapropel for sorption of lead and filtration through quartz sand filters for iron removal.
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TC, Prathna, Saroj K. Sharma i Maria Kennedy. "Arsenic and Fluoride Removal by Iron Oxide and Iron Oxide/Alumina Nanocomposites: A Comparison". W The 3rd World Congress on New Technologies. Avestia Publishing, 2017. http://dx.doi.org/10.11159/icnfa17.118.

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Raporty organizacyjne na temat "Iron removal"

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Reid, K. J. Comparison of lime and iron oxide for high temperature sulfur removal. Office of Scientific and Technical Information (OSTI), styczeń 1991. http://dx.doi.org/10.2172/5915114.

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Melson, G. Sulfur dioxide removal from flue gases by supported copper and iron absorbents. Office of Scientific and Technical Information (OSTI), styczeń 1988. http://dx.doi.org/10.2172/5501765.

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Li, D. Bimetallic Porous Iron (pFe) Materials for Remediation/Removal of Tc from Aqueous Systems. Office of Scientific and Technical Information (OSTI), wrzesień 2017. http://dx.doi.org/10.2172/1395971.

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PETERS, THOMAS. Testing of the In Situ, Mixed Iron Oxide (IS-MIO) Alpha Removal Process. Office of Scientific and Technical Information (OSTI), czerwiec 2004. http://dx.doi.org/10.2172/834243.

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Cohen, A., i M. Blander. Removal of copper from carbon-saturated steel with an aluminum sulfide/iron sulfide slag. Office of Scientific and Technical Information (OSTI), grudzień 1995. http://dx.doi.org/10.2172/510297.

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Reid, K. J., M. T. Hepworth i W. Reindl. Comparison of lime and iron oxide for high temperature sulfur removal. Final technical report, September 1, 1989--December 31, 1991. Office of Scientific and Technical Information (OSTI), maj 1994. http://dx.doi.org/10.2172/10145825.

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Veland, Siri, i Christine Merk. Lay person perceptions of marine carbon dioxide removal (CDR) – Working paper. OceanNETs, lipiec 2021. http://dx.doi.org/10.3289/oceannets_d3.3.

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This working paper presents first insights on lay public perceptions of marine carbon dioxide removal (CDR) approaches. In seven focus groups, three in Germany and four in Norway (including one pilot) the researchers asked members of the lay public to share their views of the ocean and the effects of climate change, four CDR approaches, as well as their reflections on responsible research and innovation (RRI) of marine CDR. The four CDR methods were ocean iron fertilization, ocean alkalinity enhancement, artificial upwelling, and blue carbon management through restoration of coastal and marine ecosystems. In addition, respondents were asked to compare the four approaches. Our findings indicate that the public will be very supportive of blue carbon management irrespective of its actual carbon sequestration potential, due in part to the perceived bad state of marine ecosystems worldwide. Participants were skeptical whether any of the CDR approaches could have relevant effect on carbon sequestration and long-term storage; they reasoned about issues such as the ability to scale up treatments in time and space, unforeseen or unforeseeable effects on ecosystems in time and space, and the role of industry in the implementation process. They argued that despite the potential availability of marine CDR, industry and the general public should stop polluting behaviors and practices. Nevertheless, the participants universally agreed that further research on all four CDR methods should be pursued to better understand effects on climate, ecosystems, local communities, and the economy.
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Reid, K. J. Comparison of lime and iron oxide for high temperature sulfur removal. Technical progress report No. 6, March 1, 1991--May 31, 1991. Office of Scientific and Technical Information (OSTI), grudzień 1991. http://dx.doi.org/10.2172/10109403.

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Lahav, Ori, Albert Heber i David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, marzec 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would arrive at the treatment system at higher concentrations; (2) the air in the vicinity of the animals would be cleaner, a fact that would promote animal growth rates; and (3) collection efficiency would be improved and adverse environmental impact reduced. For practical reasons, the project was divided in two: one effort concentrated on NH₃₍g₎ removal from chicken houses and another on H₂S₍g₎ removal from hog houses. NH₃₍g₎ removal: a novel approach was developed to reduce ammonia emissions from CAFOs in general, and poultry houses in particular. Air sucked by the dedicated air capturing system from close to the litter was shown to have NH₃₍g₎ concentrations an order of magnitude higher than at the vents of the ventilation system. The NH₃₍g₎ rich waste air was conveyed to an acidic (0<pH<~5) bubble column reactor where NH₃ was converted to NH₄⁺. The reactor operated in batch mode, starting at pH 0 and was switched to a new acidic absorption solution just before NH₃₍g₎ breakthrough occurred, at pH ~5. Experiments with a wide range of NH₃₍g₎ concentrations showed that the absorption efficiency was practically 100% throughout the process as long as the face velocity was below 4 cm/s. The potential advantages of the method include high absorption efficiency, lower NH₃₍g₎ concentrations in the vicinity of the birds, generation of a valuable product and the separation between the ventilation and ammonia treatment systems. A small scale pilot operation conducted for 5 weeks in a broiler house showed the approach to be technically feasible. H₂S₍g₎ removal: The main goal of this part was to develop a specific treatment process for minimizing H₂S₍g₎ emissions from hog houses. The proposed process consists of three units: In the 1ˢᵗ H₂S₍g₎ is absorbed into an acidic (pH<2) ferric iron solution and oxidized by Fe(III) to S⁰ in a bubble column reactor. In parallel, Fe(III) is reduced to Fe(II). In the 2ⁿᵈ unit Fe(II) is bio-oxidized back to Fe(III) by Acidithiobacillus ferrooxidans (AF).In the 3ʳᵈ unit S⁰ is separated from solution in a gravity settler. The work focused on three sub-processes: the kinetics of H₂S absorption into a ferric solution at low pH, the kinetics of Fe²⁺ oxidation by AF and the factors that affect ferric iron precipitation (a main obstacle for a continuous operation of the process) under the operational conditions. H₂S removal efficiency was found higher at a higher Fe(III) concentration and also higher for higher H₂S₍g₎ concentrations and lower flow rates of the treated air. The rate limiting step of the H₂S reactive absorption was found to be the chemical reaction rather than the transition from gas to liquid phase. H₂S₍g₎ removal efficiency of >95% was recorded with Fe(III) concentration of 9 g/L using typical AFO air compositions. The 2ⁿᵈ part of the work focused on kinetics of Fe(II) oxidation by AF. A new lab technique was developed for determining the kinetic equation and kinetic parameters (KS, Kₚ and mₘₐₓ) for the bacteria. The 3ʳᵈ part focused on iron oxide precipitation under the operational conditions. It was found that at lower pH (1.5) jarosite accumulation is slower and that the performance of the AF at this pH was sufficient for successive operation of the proposed process at the H₂S fluxes predicted from AFOs. A laboratory-scale test was carried out at Purdue University on the use of the integrated system for simultaneous hydrogen sulfide removal from a H₂S bubble column filled with ferric sulfate solution and biological regeneration of ferric ions in a packed column immobilized with enriched AFbacteria. Results demonstrated the technical feasibility of the integrated system for H₂S removal and simultaneous biological regeneration of Fe(III) for potential continuous treatment of H₂S released from CAFO. NH₃ and H₂S gradient measurements at egg layer and swine barns were conducted in winter and summer at Purdue. Results showed high potential to concentrate NH₃ and H₂S in hog buildings, and NH₃ in layer houses. H₂S emissions from layer houses were too low for a significant gradient. An NH₃ capturing system was designed and tested in a 100-chicken broiler room. Five bell-type collecting devices were installed over the litter to collect NH₃ emissions. While the air extraction system moved only 10% of the total room ventilation airflow rate, the fraction of total ammonia removed was 18%, because of the higher concentration air taken from near the litter. The system demonstrated the potential to reduce emissions from broiler facilities and to concentrate the NH₃ effluent for use in an emission control system. In summary, the project laid a solid foundation for the implementation of both processes, and also resulted in a significant scientific contribution related to AF kinetic studies and ferrous analytical measurements.
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Brenan, J. M., K. Woods, J. E. Mungall i R. Weston. Origin of chromitites in the Esker Intrusive Complex, Ring of Fire Intrusive Suite, as revealed by chromite trace element chemistry and simple crystallization models. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328981.

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To better constrain the origin of the chromitites associated with the Esker Intrusive Complex (EIC) of the Ring of Fire Intrusive Suite (RoFIS), a total of 50 chromite-bearing samples from the Black Thor, Big Daddy, Blackbird, and Black Label chromite deposits have been analysed for major and trace elements. The samples represent three textural groups, as defined by the relative abundance of cumulate silicate phases and chromite. To provide deposit-specific partition coefficients for modeling, we also report on the results of laboratory experiments to measure olivine- and chromite-melt partitioning of V and Ga, which are two elements readily detectable in the chromites analysed. Comparison of the Cr/Cr+Al and Fe/Fe+Mg of the EIC chromites and compositions from previous experimental studies indicates overlap in Cr/Cr+Al between the natural samples and experiments done at &amp;gt;1400oC, but significant offset of the natural samples to higher Fe/Fe+Mg. This is interpreted to be the result of subsolidus Fe-Mg exchange between chromite and the silicate matrix. However, little change in Cr/Cr+Al from magmatic values, owing to the lack of an exchangeable reservoir for these elements. A comparison of the composition of the EIC chromites and a subset of samples from other tectonic settings reveals a strong similarity to chromites from the similarly-aged Munro Township komatiites. Partition coefficients for V and Ga are consistent with past results in that both elements are compatible in chromite (DV = 2-4; DGa ~ 3), and incompatible in olivine (DV = 0.01-0.14; DGa ~ 0.02), with values for V increasing with decreasing fO2. Simple fractional crystallization models that use these partition coefficients are developed that monitor the change in element behaviour based on the relative proportions of olivine to chromite in the crystallizing assemblage; from 'normal' cotectic proportions involving predominantly olivine, to chromite-only crystallization. Comparison of models to the natural chromite V-Ga array suggests that the overall positive correlation between these two elements is consistent with chromite formed from a Munro Township-like komatiitic magma crystallizing olivine and chromite in 'normal' cotectic proportions, with no evidence of the strong depletion in these elements expected for chromite-only crystallization. The V-Ga array can be explained if the initial magma responsible for chromite formation is slightly reduced with respect to the FMQ oxygen buffer (~FMQ- 0.5), and has assimilated up to ~20% of wall-rock banded iron formation or granodiorite. Despite the evidence for contamination, results indicate that the EIC chromitites crystallized from 'normal' cotectic proportions of olivine to chromite, and therefore no specific causative link is made between contamination and chromitite formation. Instead, the development of near- monomineralic chromite layers likely involves the preferential removal of olivine relative to chromite by physical segregation during magma flow. As suggested for some other chromitite-forming systems, the specific fluid dynamic regime during magma emplacement may therefore be responsible for crystal sorting and chromite accumulation.
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