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Academic literature on the topic 'Authothermal thermophilic aerobic digestion'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Authothermal thermophilic aerobic digestion"

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Yi, Y. S., S. Kim, S. An, S. I. Choi, E. Choi, and Z. Yun. "Gas analysis reveals novel aerobic deammonification in thermophilic aerobic digestion." Water Science and Technology 47, no. 10 (May 1, 2003): 131–38. http://dx.doi.org/10.2166/wst.2003.0557.

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A laboratory-scale thermophilic aerobic digester was operated with piggery wastewater. The operating temperature varied from 50-70°C. It has been found that excessive nitrogen removal occurred in the laboratory-scale thermophilic system at various HRTs. Nitrite and nitrate were not observed in the effluent. Gas measurement reveals the presence of significant amount of N2O along with NH3 gas. The rational production of N2O gas in accordance with temperature and HRT suggests that biologically mediated deammonification processes significantly contribute to the N removal. Although further microbiological investigation is required to clarify the exact nitrogen removal mechanism, the large production of N2O gas seems to be a result of the existence of a rapid growing heterotrophic deammonification process in the thermophilic system.
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Kim, Young-Kee, Myung-Shin Kwak, Sang-Baek Lee, Won Hong Lee, and Jeong-Woo Choi. "Effects of Pretreatments on Thermophilic Aerobic Digestion." Journal of Environmental Engineering 128, no. 8 (August 2002): 755–63. http://dx.doi.org/10.1061/(asce)0733-9372(2002)128:8(755).

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Hasegawa, S., N. Shiota, K. Katsura, and A. Akashi. "Solubilization of organic sludge by thermophilic aerobic bacteria as a pretreatment for anaerobic digestion." Water Science and Technology 41, no. 3 (February 1, 2000): 163–69. http://dx.doi.org/10.2166/wst.2000.0068.

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Solubilization of organic sludge by thermophilic aerobic bacteria as a pretreatment for anaerobic digestion was investigated. The thermophilic bacteria which solubilized organic sludge were isolated from the thermophilic aerobic digestion reactor. The bacterium type SPT2-1 could grow at pH ranging from 5.0 to 8.5 with optimal temperature at 60–70°C. In batch experiments, 25–30% of volatile suspended solids (VSS) in the pre-heated sludge were solubilized on inoculating with the isolated bacteria although little was solubilized without inoculation. The isolated bacteria appeared to secret the extracellular enzymes including proteases and amylases. In continuous flow experiments, sludge solubilization rate (VSS removal) was around 40% under aerobic as well as microaerobic conditions. No accumulation of volatile fatty acids in the treated sludge was observed under aerobic conditions while significant amounts of them were accumulated under microaerobic conditions. Production of biogas on anaerobic digestion of the microaerobically-pretreated sludge was increased by 1.5 when compared with the sludge without pretreatment.
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Reimers, R. S., D. B. McDonell, M. D. Little, D. D. Bowman, A. J. Englande, and W. D. Henriques. "Effectiveness of Wastewater Sludge Treatment Processes to Inactivate Parasites." Water Science and Technology 18, no. 7-8 (July 1, 1986): 397–404. http://dx.doi.org/10.2166/wst.1986.0314.

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In the United States, Ascaris spp., Trichuris trichiura, Trichuris vulpis and Toxocara spp. are the most commonly found viable parasites in both treated and untreated municipal sludges. As expected, heat treatment, thermophilic digestion (aerobic and anaerobic) and thermophilic composting were effective in parasite inactivation, and with good sludge digestion (both aerobic and anaerobic), the effectiveness of sludge lagoon storage and sludge drying beds to inactivate parasites and pathogens is greatly enhanced. At present two commercial sludge processes, Chemfixation and Ozonics treatment have shown potential to inactivate parasites.
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Boyle, Mike, Larry Sasser, Jeff Guild, and Dave Pollack. "VERTAD™, AUTO-THERMOPHILIC AEROBIC DIGESTION: PILOT TEST RESULTS." Proceedings of the Water Environment Federation 2001, no. 1 (January 1, 2001): 1307–22. http://dx.doi.org/10.2175/193864701784993821.

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Fothergill, S., and D. S. Mavinic. "VFA Production in Thermophilic Aerobic Digestion of Municipal Sludges." Journal of Environmental Engineering 126, no. 5 (May 2000): 389–96. http://dx.doi.org/10.1061/(asce)0733-9372(2000)126:5(389).

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Hafner, Sasha D., Johan T. Madsen, Johanna M. Pedersen, and Charlotte Rennuit. "Inter-stage thermophilic aerobic digestion may increase organic matter removal from wastewater sludge without decreasing biogas production." Water Science and Technology 77, no. 3 (November 20, 2017): 721–26. http://dx.doi.org/10.2166/wst.2017.590.

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Abstract Combining aerobic and anaerobic digestion in a two-stage system can improve the degradation of wastewater sludge over the use of either technology alone. But use of aerobic digestion as a pre-treatment before anaerobic digestion generally reduces methane production due to loss of substrate through oxidation. An inter-stage configuration may avoid this reduction in methane production. Here, we evaluated the use of thermophilic aerobic digestion (TAD) as an inter-stage treatment for wastewater sludge using laboratory-scale semi-continuous reactors. A single anaerobic digester was compared to an inter-stage system, where a thermophilic aerobic digester (55 °C) was used between two mesophilic anaerobic digesters (37 °C). Both systems had retention times of approximately 30 days, and the comparison was based on measurements made over 97 days. Results showed that the inter-stage system provided better sludge destruction (52% volatile solids (VS) removal vs. 40% for the single-stage system, 44% chemical oxygen demand (COD) removal vs. 34%) without a decrease in total biogas production (methane yield per g VS added was 0.22–0.24 L g−1 for both systems).
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Jin, Ningben. "The effect of phosphate buffer on improving the performance of autothermal thermophilic aerobic digestion for sewage sludge." RSC Advances 8, no. 17 (2018): 9175–80. http://dx.doi.org/10.1039/c8ra00793d.

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9

Vallini, G., F. Cecchi, P. Pavan, A. Pera, J. Mata-Alvarez, and A. Bassettit. "Recovery and Disposal of the Organic Fraction of Municipal Solid Waste (MSW) by Means of Combined Anaerobic and Aerobic Bio-Treatments." Water Science and Technology 27, no. 2 (January 1, 1993): 121–32. http://dx.doi.org/10.2166/wst.1993.0089.

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The paper deals with the semi-dry anaerobic digestion of municipal solid waste followed by composting as finishing treatment of the digested sludge. The integration of the anaerobic and aerobic treatments was studied as approach to close the water balance of the semi-dry anaerobic digestion process and to remove the phytotoxicity of the digested effluent. This study evaluated the response of the anaerobic effluent to the co-composting post-processing step, whether the anaerobic sludge came from mesophilic semi-dry digestion or thermophilic semi-dry nethanization. Evaluation of the strategy adopted was carried out in terms of performance of aerobic stabilization and its incidence on the economy of the overall treatment and the water balance of the process. Co-composting gave best results when integrated with thermophilic digestion.
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Damtie, Mekdimu Mezemir, Jingyeong Shin, Hyun Min Jang, and Young Mo Kim. "Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion." Energies 13, no. 17 (September 2, 2020): 4547. http://dx.doi.org/10.3390/en13174547.

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A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 °C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 °C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 °C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.
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Dissertations / Theses on the topic "Authothermal thermophilic aerobic digestion"

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Parsons, Bonita Grace. "Impacts of temperature and hydraulic retention tie on odours produced from authothermal thermophilic aerobic digestion." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2734.

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Five different combinations of Hydraulic Retention Times (HRT) and temperatures were used in a two stage (feed and test reactor) Autothermal Thermophilic Aerobic Digestion System to assess the impact of these parameters on the production of odorous gases. The gases monitored were hydrogen sulphide, dimethyl sulphide, methyl mercaptan, ammonia, and amines. Other liquid parameters were also monitored in order to better understand the impacts of temperature and HRT. These parameters are total solids content, volatile solids content, volatile solids destruction, specific oxygen uptake rate, alkalinity, ammonia concentration, and pH. In order to assess the character of the sludge and understand the digestion process the carbohydrate, fat, and protein content were also measured in the inputs and in the test reactor. It was found that all of the odorous compounds measured were affected by stage of digestion and temperature more than by HRT. Of the five compounds monitored, none were affected by changes in the HRT of the test reactor. However, the concentrations measured in the feed and test reactors were often a degree of magnitude apart. The reduced sulphur compounds (hydrogen sulphide, methyl mercaptan, and dimethyl sulphide) were found in higher concentrations in the feed reactor than in the test reactor; whereas ammonia and amines were found in much higher concentrations in the test reactor than in the feed reactor. Also, ammonia concentrations were significantly higher in both reactors when the temperature was higher; and amine concentration was higher in the test reactor when the temperature was higher. One set of tests for volatile fatty acid concentration was also undertaken. While breakdown of the carbohydrates and fats occurred throughout the process, proteins were broken down into their amino acids, releasing reduced sulphur compounds in the feed reactor and then deaminated, releasing ammonia and amines in the test reactor.
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Ugwuanyi, Jeremiah Obeta. "Aerobic thermophilic digestion of model agricultural wastes." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366924.

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Mottola-Lugo, Luciana. "SMALL DECENTRALIZED AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION FOR PATHOGEN REDUCTION." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/1025.

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The current research relates to a system driven by renewable energy and chemical energy contained in the feed, which will eliminate and reduce pathogens found in human excreta. A project in the form of an experiment for demonstration will be designed and built to operate in the local waste water treatment plant. Data will be analyzed and recorded, including fecal coliforms and E.coli levels, chemical oxygen demand (COD) and total solids removal (TS). The effectiveness of the system will depend upon results obtained and weather conditions. The principal objective of the research is to test and demonstrate that the "Small Decentralized ATAD" is successful in removing/eliminating enteric pathogens found in human excreta. Most importantly, the Bill and Melinda Gates Charity Foundation is providing financial support (Grants) for new sanitation ideas to help developing countries overcome diseases, specifically water borne diseases and also diseases related to hygiene and sanitation. Moreover, the "Water, Sanitation & Hygiene: Grand Challenges Explorations" granted a $100,000 Grant to Professor James Blackburn from Southern Illinois University at Carbondale in the Mechanical Engineering and Energy Processes Department. Consequently, the "Decentralized Next Generation for Diarrheal Pathogens" project will be tested using the ATAD (Autothermal Thermophilic Aerobic Digestion) to demonstrate its effectiveness in pathogen reduction and elimination.
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McIntosh, Karen Bonnie. "Volatile fatty acid production during thermophilic aerobic digestion pre-treatment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ32185.pdf.

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Agarwal, Saurabh. "Conditioning and Dewatering Behavior of ATAD Sludges." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31480.

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Autothermal thermophilic aerobic digestion (ATAD) of sludge has been used to produce class A biosolids. With stringent EPA guidelines, more and more municipalities are looking to use this process for digestion of sludge. However the large polymer costs associated with dewatering these sludges has made the use of this technology unfavorable. Several studies have been conducted in the past which have looked into the mechanism leading to such a poor dewatering of sludge. Some of these studies have attributed the release of protein and polysaccharide during the high temperature digestion to be responsible for the poor dewatering. However the exact mechanism leading to the poor dewatering is still not totally clear. Laboratory scale studies were conducted to evaluate the mechanism leading to the poor dewatering of these sludges and also to be able to economically condition these sludges. ATAD sludge samples were collected from ATAD processing facilities in Ephrata, PA, Cranberry, PA, Titusville, FL and College Station, TX. The research included experiments evaluating the protein and polysaccharide concentrations in solution, cations and anions, iron and aluminum, zeta potential and capillary suction time. It was found that during digestion large amounts of protein and polysaccharide were released which were in the colloidal range, and the dewatering of each of these sludges became poorer as the amount of protein and polysaccharide in the solution increased. The release of protein and polysaccharide was related to the monovalent to divalent cation ratio and the iron and aluminum concentration in the sludge. Also during the digestion process, the pH of the sludge increased appreciably and the divalent cations precipitated out. The zeta potential of the ATAD digested sludge was also found to be positive. Different chemical coagulants were used to condition the sludge, but even with high polymer doses the dewatering of the sludge was not satisfactory. A combination of iron (or cationic polymer) followed by anionic polymer was found to improve the dewatering to a desired level. The use of this combination of sludge conditioning also provides an economical solution to the problem of dewatering. The role of iron in improving the dewatering of the sludges was found to be important, with the sludge dewatering being better for sludges with a high iron content. The combination of high pH, divalent cation precipitation, iron deficiency and biopolymer release all contribute to the poor dewatering of ATAD sludge.
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6

Chu, Angus. "Volatile fatty acid metabolism in thermophilic aerobic digestion of sludge." Thesis, 1995. http://hdl.handle.net/2429/7219.

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The efficacy of Volatile Fatty Acid (VFA) production in Thermophilic Aerobic Digestion (TAD) of primary sludge was investigated. This research program was carried out in a pilot scale, TAD process, located in the wastewater treatment pilot plant site, at the University of British Columbia. Preliminary results showed that the highest accumulation of VFA (950 mg/L as acetate) had occurred, under microaerobic conditions (air flow rate of between 0-0.17 V/V-h), in the first stage of the 150 L, 2-stage process. The two other aeration conditions examined (transition-air flow rate of 0.28 V/V-h and aerobic-air flow rate of 0.6 V/V-h) accumulated negligible amounts of VFA. Therefore, the subsequent research concentrated on the first stage of the TAD process, under microaerobic conditions. The two independent variables examined were air flow rates and solids retention times (SRT). The three SRTs tested were 3, 4.5 and 6 days. The four air flow rates examined were assigned the labels true anaerobic, low flow microaerobic, medium flow microaerobic and high flow microaerobic conditions. Net VFA production was found to be a function of both aeration and SRT. In general, as SRT and air flow rates decreased, net VFA production increased (specifically acetate and propionate). The measured concentration of any species of VFA, at any given time, was a function of both the relative rates of its synthesis and biodegradation. Decreasing or increasing the aeration rate and/or SRT resulted in a proportional change in VFA accumulation. The maximum measured acetate accumulation rate occurred under the 4.5 d SRT and the true anaerobic condition. A biochemical model was developed in order to explain the process of VFA metabolism in TAD. In this process, under strict anaerobic conditions, bacteria must achieve oxidation/reduction balance by diverting the catabolic flow of carbon to fermentative end products (eg. propionate) that will consume NADH (Nicotinamide Adenine Dinucleotide). The key issue in fermentation is the recycling of NADH by the conversion of specific intermediates to different fermentation products which regenerate NAD⁺. The oxidation of intermediates that required the net reduction of NAD⁺ cannot proceed under fermentative conditions. Consequently, these catabolic intermediates added under batch test conditions, using TAD sludge, under anaerobic conditions, remained in their unoxidized form and persisted in the medium. The oxidation of intermediates which required no net reduction of NAD⁺ can and did proceed under fermentative conditions. Under strict anaerobic conditions, the VFA profiles in the pilot scale TAD process were similar to fermentation type processes (eg. an even distribution of VFA between acetate and propionate). When the bioreactors were operated under microaerobic conditions (ie. oxygen demand is greater than oxygen supply), metabolism resulted in a characteristic VFA distribution profile with acetate as the predominant VFA produced (up to 80% of the total VFA). Propionate constituted the second largest fraction at 11%. Under this microaerobic condition, the NADH produced during oxidation of substrates could be reoxidized by operation of the respiratory chain. Therefore, the carbon flow could be uncoupled from the necessity to maintain redox balance via fermentative means. This separation would presumably allow the organisms in a TAD process to maximize ATP (adenosine triphosphate) production by increasing the flux of intermediates to acetate. The majority of the substrates examined under batch test conditions, with TAD process biomass, under microaerobic conditions, were oxidized to an acetate intermediate.
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7

Chiang, Po-Yi, and 江柏毅. "Treatment of Wasted Activated Sludge with a Thermophilic Aerobic Digestion System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32273385728767659797.

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碩士
國立中興大學
環境工程學系所
101
The activated sludge process is the most widely used biological treatment process for municipal and organic industrial wastewaters treatment, But the major by-product of this process is waste activated sludge (WAS). The treatment and disposal of WAS accounted for about half, even 60%, of the total wastewater treatment cost. Thermophilic aerobic digestion (TAD) is a process being operated at 45-65℃ in the aerobic condition. Also, a considerable amount of heat would be released during the aerobic biological process which can make autothermal thermophilic aerobic digestion an economically viable option. USEPA assessed the autothermal thermophilic aerobic digestion (ATAD) was a feasible process on the sludge digestion. ATAD process also demonstrated its major merits on the high biosolids mass reduction, acceptable PFRP (process to further reduce pathogens) performance, and high digestion rates. In this study, the thermophilic aerobic membrane bioreactor, with a volume of 25 L, was operated at 55℃. Initially, a mixed thermophilic bacterial culture was acclimated with the influent substrate of 10,000 mg-COD/L which was made of glutamic acid and sucrose. When the system reached steady state, the same concentration of the glutamic acid, sucrose and wasted sludge were substituted for the influent substrate. In addition, this study embloyed different batch test to obtain factors affecting sludge degradation and operations. Furthermore, PCR-DGGE was applied to determine the microbial communities of mixed culture in the bioreactor. The results showed that the average removal efficiency of SCOD was 86% and the cofficient of growth (Y) was 0.17 mg-cell/mg-COD when treated with high concentration organic wastewate. That confirmed the thermophilic aerobic digestion system had exhibited considerable advantages for the treatment of high-strength wastewater and low sludge production. When the influent substrate was made of glutamic acid, sucrose and wasted sludge, the results showed that the removal efficiency of TCOD, MLSS and SCOD were up to 28、10 and 71% respectivily. After mixing the thermophilic bacteria which were taken from different sources to digest the WAS, the result showed that the removal efficiency of MLSS and MLVSS were up to 27 and 38% at 25 days.
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Cheng, Chin-Heng, and 鄭欽恆. "A study of sewage sludge reduction by using thermophilic aerobic digestion." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/m4657u.

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碩士
國立臺北科技大學
環境規劃與管理研究所
95
As the more popular sewerage treatment system, the more sludge produced in Taiwan. Depending on the characteristics of organic sludge, this study researches the properties of thermophilic aerobic digestion by innovative technologies developed. In this process, the excess activated sludge is reduced in two stages : (1) A part of the returned sludge is solubilized with enzyme secreted from the thermophilic bacteria in the S-TE reactor. This enhances the bio-degradability of the return sludge. (2) The solubilized return sludge is then decomposed and mineralized by the activated sludge microorganisms in the aeration tank. The focus is about the properties of thermophilic aerobic digestion applying in sewage by S-TE process. The experiments includes two parts: one is pre-heat at the level of 60~65℃, and find out the efficiency of disintegration cell well. The other is thermophilic aerobic digestion. The results show that the most advantageous temperature for microorganism is 60~65℃. In addition, dissolve COD twice as which not be 360 min agitating, indicate agitating help for the efficiency of disintegration. The results also show that removal efficiency in batch digestion of SS, VSS and CODss are 53.7％, 64.3％ and 63.3％. removal efficiency in semi-continuous digestion efficiency of SS, VSS and CODt are 30.2％, 50.4％ and 24.8％. Overall sludge broken and thermophilic aerobic digestion are positive help.
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Yeh, Chun-Feng, and 葉俊鋒. "A Kinetic Study of Municipal Sewage Sludge by Using Thermophilic Aerobic Digestion." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/kcxszs.

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碩士
國立臺北科技大學
環境工程與管理研究所
97
In order to improve environmental quality, Taiwan’s government makes more effort on building sewerage systems construction. These operating sewerage systems will lead to an important increase in sewage sludge production .Due to the limitation of landfall site, municipal sewage sludge disposal will become a hot issue in the future. The purposes of this study was to carry out the comparison the different of the ultrasounds and untreated sludge, moreover the kinetic analytic integrated with thermophilic aerobic digestion process were also be discussed. The aim of ultrasounds is to solubilise and/or to reduce the size of organic compounds, and especially refractory compounds, in order to make them more easily biodegradable. Final quantity of residual sludge and time of digestion can thus be reduced. The objective of pretreatment is to increase reduction efficiency of thermophilic aerobic digestion. The characteristics of thermophilic aerobic digestion process include three parts: (1) increase in organic sewage sludge reduction (2) sludge retention time can be reduced (3) biosolids may be totally contained until they are stabilized. The characteristics of sludge dynamics was also studied and the dynamics model can be utilized to (1) understand the changing of sewage quality and the operational conditions of sewage treatment; (2) lower the cost of sewage treatment (3) support management policies and help to evaluate new sewage treatment design, and shorten the designing time. The experiment includes two parts. The first is pretreatment of sludge using ultrasounds, and find out the efficiency of disintegration cell well. The second stage takes substrate concentration before and after digestion to derive the indecomposable ratio. Inserting the number into the Monod equation, μmax and Ks was obtained. From the result of this experiment, the digestion dynamics coefficient, and the comparison to references, it was demonstrated that the 4 experimental groups, there were (Ks) 8410, 978, 198, 4340 mg/L separately. We suspect the reason that a high Ks was achieved with the combination of thermophiles and ultrasound irradiation is that the experiment was partial continuous and the air sparging mixer was not automated.This was only observed in a combination of thermophiles and ultrasound irradiation. The result demonstrates that ultrasound irradiation in combination with high temperature digestion can increase Ks and the microbes in sludge, enabling a better decomposition of substrate.
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Li, Jowitt Z. X. "Recovering biodegradable carbon from a thermophilic aerobic digestion supernatant for biological nutrient removal." Thesis, 2001. http://hdl.handle.net/2429/13754.

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The biological nutrient removal (BNR) process usually requires external carbon supplements for enhanced phosphorus and nitrogen removal. It has become popular for full-scale wastewater treatment plants to implement carbon addition and optimization, to ensure best system performance. Thermophilic aerobic digestion (TAD) is operated at elevated temperatures to achieve sludge stabilization, volatile solids destruction, and pasteurization. Preliminary tests indicated that the volatile fatty acids (VFAs) accumulation in the TAD sludge supernatant, under a microaerated operation (system oxygen demand exceeds the supply), was a potential carbon source for BNR enhancement. A targeted degree of solids destruction efficiency can also be achieved under the microaerated operation, and the VFAs can be internally recovered for BNR enhancement purposes. The objectives of this study were to investigate the feasibility of using the TAD supernatant as a carbon source for BNR enhancement, and the potential impacts of the TAD supernatant addition on the system performance. Furthermore, due to the nature of VFA variance in TAD supernatant, TAD supernatant addition must be optimized in practice to obtain the benefits of carbon supplement and eliminate the potential nutrient overloading. A new control and monitoring technique was developed in this study using the headspace gaseous monitoring to estimate the VFA concentrations in TAD supernatant, and assess the BNR system performance. In this study, TAD supernatant was proven to be a potential carbon source for B NR enhancement in both batch and continuous feed studies. The VFAs in TAD supernatant resulted in comparable phosphorus release and denitrification. In addition, substrates other than the VFAs in the TAD supernatant were also found to be available for both P release and denitrification. The extra nutrient load (nitrogen and phosphorus) was significant, requiring mitigation and dosing optimization to reduce treatment system deterioration. Due to the feature of degradation during its storage, it was found that TAD supernatant should be added into the process train as fresh as possible, to maximize the VFA utilization and heat energy production. The "headspace carbon dioxide (C0₂) monitoring" method proposed in this study was proven feasible in estimating the VFA equivalent in the TAD supernatant. This C0₂ monitoring approach can be applied for the on-line TAD supernatant dosing optimization practice. The duration of C0₂ changes shown on the C0₂ profile (between the point of C0₂ starting to increase, and the point starting to decrease after the peak) of the phosphorus release and denitrification enhancement, due to the external carbon source addition, was defined as the "E Time" in this study. The duration of "E Time" was found to be proportional to the available carbon source concentration at the time of addition. A high accuracy in sodium acetate (NaAc) concentration estimation was also demonstrated in this study. In addition, the VFA equivalent in TAD supernatant was derived by comparing the "E Time" with a standard sodium acetate test. This headspace C0₂ monitoring can be potentially applied as a means of monitoring the efficiency and microorganism activity in a BNR process train. This "E Time" approach using the headspace C0₂ monitoring can be an attempt to replace the current oxygen utilization rate (OUR) method for readily biodegradable substrate determination. BNR operation can be benefited by this on-line monitoring to obtain the information of readily utilizable carbon concentration, optimized dosage control, and system performance. The headspace monitoring setup also prevents the sensor contacting with the sludge samples and saves the maintenance efforts.
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Books on the topic "Authothermal thermophilic aerobic digestion"

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Palfrey, R. N. The thermophilic aerobic/mesophilic anaerobic sludge digestion process. Swindon: Foundation for Water Research, 1993.

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2

M, Bruce A., Colin F, Newman P. J, and Commission of the European Communities., eds. Treatment of sewage sludge: Thermophilic aerobic digestion and processing requirements for landfilling. London: Elsevier Applied Science, 1989.

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Bruce, A. M., and F. Colin. Treatment of Sewage Sludge: Thermophilic Aerobic Digestion and Processing Requirements for Landfilling. Elsevier Applied Science, 1989.

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United States. Environmental Protection Agency. Office of Research and Development, ed. Environmental regulations and technology: Autothermal thermophilic aerobic digestion of municipal wastewater sludge. Washington, DC: U.S. Environmental Protection Agency, Office of Research and Development, 1990.

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Book chapters on the topic "Authothermal thermophilic aerobic digestion"

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Paulsrud, B., and K. T. Nedland. "Full Scale Experiences with Thermophilic Aerobic Digestion of Primary-Chemical Sewage Sludge." In Chemical Water and Wastewater Treatment III, 329–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79110-9_25.

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Capón-García, Elisabet, Jaime Rojas, Toshko Zhelev, and Moisès Graells. "Operation scheduling of batch autothermal thermophilic aerobic digestion processes." In Computer Aided Chemical Engineering, 1177–82. Elsevier, 2010. http://dx.doi.org/10.1016/s1570-7946(10)28197-x.

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Vaklieva-Bancheva, Natasha G., Elisaveta G. Kirilova, and Raika K. Vladova. "Capturing Uncertainties for Sustainable Operation of Autothermal Thermophilic Aerobic Digestion Systems." In Computer Aided Chemical Engineering, 1729–34. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-444-63455-9.50123-9.

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Grigorieva, Ellina, Natalia Bondarenko, Evgenii Khailov, and Andrei Korobeinikov. "Finite-Dimensional Methods for Optimal Control of Autothermal Thermophilic Aerobic Digestion." In Industrial Waste. InTech, 2012. http://dx.doi.org/10.5772/36237.

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Rojas, Jaime, and Toshko Zhelev. "Energy Efficiency Advancements in Wastewater Treatment – Study of Autothermal Thermophilic Aerobic Digestion." In Computer Aided Chemical Engineering, 1269–73. Elsevier, 2009. http://dx.doi.org/10.1016/s1570-7946(09)70211-1.

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Kirilova, Elisaveta, Rayka Vladova, and Natasha Vaklieva-Bancheva. "Multiscenario Approach for Capturing Uncertainties in Energy-Integrated Autothermal Thermophilic Aerobic Digestion Systems." In Soft Computing Techniques in Solid Waste and Wastewater Management, 469–89. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-824463-0.00007-0.

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Conference papers on the topic "Authothermal thermophilic aerobic digestion"

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Kelly, Harlan G., Wayne Urban, and Roger Warren. "Design Considerations for Autothermal Thermophilic Aerobic Digestion." In World Water and Environmental Resources Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40792(173)110.

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Whitaker, Dawn R., and James E. Alleman. "Evaluation of Thermophilic Aerobic Digestion for Waste Treatment." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-3095.

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Cheng, Jie Hong, and Nan Wen Zhu. "Effect of Atuothermal Thermophilic Aerobic Digestion Operation on Reactor Temperatures." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering (ICBBE '08). IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.312.

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Liu, Jingming, Jian Lin, Yanyan Chen, Zhirong Zhu, and Ji Ma. "Study on Pretreatment and Kinetics of Waste Klebsiella Pneumoniae by the Autothermal Thermophilic Aerobic Digestion Process." In 2011 International Conference on Measuring Technology and Mechatronics Automation (ICMTMA). IEEE, 2011. http://dx.doi.org/10.1109/icmtma.2011.696.

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You might also be interested in the extended bibliographies on the topic 'Authothermal thermophilic aerobic digestion' for particular source types:
Journal articles
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