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Inducing Functional Stability Of Anaerobic Co Digestion Of Grease Interceptor Waste And Thickened Waste Activated Sludge
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Book Synopsis Inducing Functional Stability of Anaerobic Co-digestion of Grease Interceptor Waste and Thickened Waste Activated Sludge by : Elvin Haffez Hossen
Download or read book Inducing Functional Stability of Anaerobic Co-digestion of Grease Interceptor Waste and Thickened Waste Activated Sludge written by Elvin Haffez Hossen and published by . This book was released on 2013 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Co-digestion of Thickened Waste Activated Sludge with Grease Interceptor Waste by : Ling Wang
Download or read book Anaerobic Co-digestion of Thickened Waste Activated Sludge with Grease Interceptor Waste written by Ling Wang and published by . This book was released on 2012 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mesophilic Anaerobic Co-digestion of Municipal Wastewater Sludge and Un-dewatered Grease Trap Waste by : Sedat Yalcinkaya
Download or read book Mesophilic Anaerobic Co-digestion of Municipal Wastewater Sludge and Un-dewatered Grease Trap Waste written by Sedat Yalcinkaya and published by . This book was released on 2014 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fat, oil, and grease residues, food particles, solids and some kitchen wastewaters are collected in grease traps which are separate from the municipal wastewater stream. Grease traps are emptied periodically and grease trap waste (GTW) is hauled for treatment. This dissertation focuses on anaerobic co-digestion of un-dewatered (raw) GTW with municipal wastewater treatment sludge (MWS) at wastewater treatment plants. In particular, this research focuses on the biochemical methane potential of un-dewatered GTW as well as the stability and performance of anaerobic co-digestion of MWS and un-dewatered GTW. A set of modified biochemical methane potential tests was performed to determine the methane potential of un-dewatered GTW under mesophilic conditions (35 °C). Methane potential of un-dewatered GTW in this study was 606 mL CH4/g VS [subscript added] which is less than previously reported methane potentials of 845 - 1050 mL CH4/g VS [subscript added] for concentrated/dewatered GTW. However, the methane potential of un-dewatered GTW (606 mL CH4/g VS [subscript added]) was more than two times greater than the 223 mL CH4/g VS [subscript added] reported for MWS digestion alone. A comprehensive study was performed to determine the stability and performance of anaerobic co-digestion of MWS with un-dewatered GTW as a function of increasing GTW feed ratios. The performance of two semi-continuously fed anaerobic digesters at 35 °C was evaluated as a function of increasing GTW feed ratios. Anaerobic co-digestion of MWS with un-dewatered GTW at a 46% GTW feed ratio (on a volatile solids basis) resulted in a 67% increase in methane production and a 26% increase in volatile solids reduction compared to anaerobic digestion of MWS alone. On the other hand, anaerobic co-digestion of un-dewatered GTW resulted in a higher inhibition threshold (46% on VS basis) than that of dewatered GTW. These results indicate that using un-dewatered GTW instead of dewatered GTW can reduce the inhibition risk of anaerobic co-digestion of MWS and GTW. Recovery of the anaerobic digesters following upset conditions was also evaluated and semi-continuous feed of digester effluent into upset digesters yielded of the biogas production level of the undisrupted digestion. Finally, a mathematical model was used to describe the relationship between methane potential and GTW feed ratio on a VS basis. The results of this research can be used to predict methane production and identify suitable GTW feeding ratios for successful co-digestion of un-dewatered GTW and MWS.
Book Synopsis Thermophilic and Hyper-thermophilic Anaerobic Co-digestion of Thickened Waste Activated Sludge and Fat, Oil, and Grease by : Rania Mona Zeid Alqaralleh
Download or read book Thermophilic and Hyper-thermophilic Anaerobic Co-digestion of Thickened Waste Activated Sludge and Fat, Oil, and Grease written by Rania Mona Zeid Alqaralleh and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Co-digestion of Municipal Sewage Sludge with Selected Commercial and Industrial Organic Wastes by : Vahid Razaviarani
Download or read book Anaerobic Co-digestion of Municipal Sewage Sludge with Selected Commercial and Industrial Organic Wastes written by Vahid Razaviarani and published by . This book was released on 2014 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall goal of this research was to investigate the anaerobic co-digestion of municipal sewage sludge with selected organic wastes in three main areas: (1) to determine the maximum feasible loading of co-substrate, (2) to calibrate the ADM1 model for co-digestion system at steady state, and (3) to evaluate the linkage between microbial community dynamics and reactor performance and stability during steady state and overloading co-digestion. In this study, restaurant grease waste (GTW) as a commercial waste and biodiesel glycerin waste (BGW) as an industrial waste were co-digested with municipal wastewater sludge (MWS) in separate trials. In the first part of this research, the maximum feasible loading of each of the organic wastes with MWS with respect to the reactor performance and stability were investigated in the separate pilot-scale experiments. In each run, two 1300L completely mixed reactors were operated under mesophilic temperature (37°C) and a solids retention time (SRT) of 20 days. Throughout the pilot experiment, one reactor served as control and received only MWS and the other was assigned as the test digester and fed with the mixture of MWS and the co-substrate (GTW or BGW) in various organic loadings. GTW co-digestion with MWS was found to be feasible up to a maximum loading of 23% VS or 58% COD relative to the total 1.6 kg VS/m3-d or 4.0 kg COD/m3-d loadings, respectively. At this loading, test digester biogas production was 67% greater than that of the control. The test digester biogas production declined markedly when the percentage of VS from GTW in its feed was increased to 30% of its total VS loading. Causes of the reduced biogas production were investigated and attributed to process inhibition due to long chain fatty acid accumulation. The maximum safe limit of BGW co-digested with MWS was found at 23% and 35% of the total 1.04 kg VS/ (m3-d) and 2.38 kg COD/ (m3-d) loadings, respectively. At this loading, the biogas and methane production rates in the test digester were 1.65 and 1.83 times greater than of those in the control digester which received only MWS, respectively. Process instability was observed when the proportion of BGW in the test digester feed was 31% and 46% of the 1.18 kg VS/ (m3-d) and 2.88 kg COD/ (m3-d) loadings, respectively. In the second part of the research, the ADM1 model was calibrated for co-digestion of MWS and GTW at steady state using anaerobic respirometric test with substrate characterizations. Initial biomass concentrations and distributions were estimated using methane production rate curves together with effluent values from full-scale anaerobic digesters. Two separate datasets obtained from steady state mesophilic bench-scale experiments were used to calibrate and validate the model. The modified model was able to predict reasonably well the steady-state results of biogas production, CH4 and CO2 contents, pH, alkalinity, COD and VSS observed within the evaluated GTW loading. The calibrated model predicted well the bench and pilot scale co-digesters performance. The last part of the study was to investigate the relationships between microbial population (bacteria and archaea) dynamics and reactor performance and stability during the co-digestion of MWS with GTW or BGW in two separate trails. Pyrosequencing analysis revealed that Methanosaeta and Methanomicrobium were the dominant acetoclastic and hydrogenotrophic methanogen genera, respectively, during stable reactor operation. The roles of syntrophic bacteria such as Candidatus Cloacamonas-- and hydrogenotrophic methanogens were found to be substantial at overloading conditions in both experiments.
Book Synopsis Influencing the Anaerobic Microbiome Through Substrate Selection and Overloading Stresses to Achieve High-Performance Co-Digestion of Grease Interceptor Waste by : Ling Wang
Download or read book Influencing the Anaerobic Microbiome Through Substrate Selection and Overloading Stresses to Achieve High-Performance Co-Digestion of Grease Interceptor Waste written by Ling Wang and published by . This book was released on 2018 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Digestion Process Stability and the Extension of the ADM1 for Municipal Sludge Co-Digested with Bakery Waste by : Morris Elya Demitry
Download or read book Anaerobic Digestion Process Stability and the Extension of the ADM1 for Municipal Sludge Co-Digested with Bakery Waste written by Morris Elya Demitry and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Uncertainty about anaerobic digestion process stability is the main issue preventing more widespread use of the process as a source of energy recovery in wastewater treatment facilities. The overall objective of this research was to study the feasibility of enhancing biogas production inside wastewater facilities using co-digestion of municipal sludge with bakery waste. Another objective was to improve the stability index and a mathematical model that can be useful tools to predict the process stability of municipal sludge digestion alone, and when it is mixed with bakery waste, as a substrate for microorganisms. Experiments were conducted in three phases. In phase 1, a full-scale anaerobic digester at Central Weber Sewer Improvement District, Ogden, UT, receiving a mixture of primary and secondary sludge, was monitored for one hundred days. Chemical oxygen demand (COD), and volatile solids (VS) mass balances were conducted to evaluate the stability of the digester and its capability of producing methane gas. The COD mass balance accounted for nearly 90% of the methane gas produced while the VS mass balance showed that 91% of the organic matter removed resulted in biogas formation. Other parameters monitored included: pH, alkalinity, VFA, and propionic acid. The values of these parameters showed that the digester was running under stable steady state conditions. At mesophilic temperature, the stability index was determined and equal to 0.40 L (CH4)/ g(Î4VS) In phase 2, the feasibility of adding BW to MS was tested in batch reactors scale. The biogas production was enhanced and the digester was stable until the range of 37- 40% of BW to 63-60% of MS. The ADM1 coefficients were modified to accurately predict the digester performance. The modified model outputs (pH, VFA, and methane) were within acceptable ranges when compared with the observed data from the batch reactors. In phase 3, the feasibility of MS and BW were tested using an Induced Bed Reactor (IBR) with a 50:50% ratio of MS:BW (COD basis). The process was stable during different hydraulic retention times and the ADM1 was modified to predict the stability of the process in the IBR.
Book Synopsis Anaerobic Digestion of Waste Activated Sludge by : Roy L. Belser
Download or read book Anaerobic Digestion of Waste Activated Sludge written by Roy L. Belser and published by . This book was released on 1983 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental, Economic, and Process Evaluation of Anaerobic Co-digestion of Grease Trap Waste with Municipal Wastewater Sludge by : James Hunter Long
Download or read book Environmental, Economic, and Process Evaluation of Anaerobic Co-digestion of Grease Trap Waste with Municipal Wastewater Sludge written by James Hunter Long and published by . This book was released on 2012 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Co-digestion of Municipal Sludge and Restaurant Grease by : Zengkai Liu
Download or read book Anaerobic Co-digestion of Municipal Sludge and Restaurant Grease written by Zengkai Liu and published by LAP Lambert Academic Publishing. This book was released on 2014-04-30 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anaerobic codigestion of municipal wastewater sludge and restaurant grease was investigated in a semi-continuous lab-scale digestion experiment under mesophilic condition (37 C). Compared to the control digester, COD loading rate for test digester was elevated to 387% (organic loading rate 4.235 kgVS/m3/d) and led to 467% increase in daily biogas production, 25.2% increase in methane yield (based on VS deduction), 29.8% increase in COD reduction rate and 27.2% increase in VS reduction rate, respectively. Methane content ranged from 62% to 67%. There was no negative effect of grease addition on the digester performance in this experiment. The great increases in biogas production and methane yield indicated enhanced digestion performance. In addition, partial alkalinity and pH proved to be good indicators to monitor digestion process and predict overloading. It is still possible to keep increasing organic loading by the addition of more grease, but according to monitoring results, the system was close to overloading.
Book Synopsis Anaerobic Co-digestion of Municipal Solid Waste and Sewage Sludge by : Nancy Hamzawi
Download or read book Anaerobic Co-digestion of Municipal Solid Waste and Sewage Sludge written by Nancy Hamzawi and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a solution to the problems of municipal solid waste management, anaerobic digestion possesses the optimal combination of volume reduction, probability of success and potential for both energy and resource recovery. An innovative application of anaerobic processes is the co-digestion of sewage sludge and the organic fraction of municipal solid waste (OFMSW). The purpose of this study is to evaluate the technical feasibility of this process in the context of typical Canadian solid waste. Lab-scale experiments were initially conducted using one litre batch bioreactors operated mesophilically (37$\sp\circ$C) and fed a mixture of primary sludge (RAW), thickened waste activated sludge (TWAS) and simulated OFMSW. To facilitate organics solubilization, three pretreatments were evaluated: thermal, alkaline and thermochemical. Using a central composite experimental design, two factors were studied, the total solids content of the feed and its particle size. For all three pretreatments, second order empirical models were developed with respect to common indicators of metabolic activity, namely, biogas production, biogas methane concentration, soluble chemical oxygen demand (COD) removal and total and volatile solids reduction. (Abstract shortened by UMI.).
Book Synopsis Aerobic Stabilization of Waste Activated Sludge by : David B. Cohen
Download or read book Aerobic Stabilization of Waste Activated Sludge written by David B. Cohen and published by . This book was released on 1975 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Co-digestion of Organic Food Wastes, Fat Oil and Grease with Wastewater Sludge to Optimise Energy Production and Biogas Purification by : Olumide Wesley Awe
Download or read book Anaerobic Co-digestion of Organic Food Wastes, Fat Oil and Grease with Wastewater Sludge to Optimise Energy Production and Biogas Purification written by Olumide Wesley Awe and published by . This book was released on 2017 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anaerobic Digestion of Thickened Waste Activated Sludge Containing Iron Phosphates by : Alan Gene Hartenstein
Download or read book Anaerobic Digestion of Thickened Waste Activated Sludge Containing Iron Phosphates written by Alan Gene Hartenstein and published by . This book was released on 1970 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stabilization of Thickened-activated Sludge Through the Anoxic-aerobic Digestion Process by : Ming Ying Tan
Download or read book Stabilization of Thickened-activated Sludge Through the Anoxic-aerobic Digestion Process written by Ming Ying Tan and published by . This book was released on 2002 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerobic digestion is widely used to treat waste-activated sludge and thickened sludge from wastewater treatment plant due to its shorter retention time and achieving the same efficiency in solids volume reduction compared to anaerobic digestion. However, the supernatant and filtrate from the aerobic digestion system contain high concentration of suspended solids. The nitrogen which had been embedded in sludge is solubilized to form ammonical and nitric nitrogen which in turn tranferred to the liqour and cause the increase of nitrogen loading in sewage treatment plant. In this study, anoxic-aerobic digestion is applied to remove both the mixed-liquor volatile suspended solids (MLVSS) and soluble nitrogen simultaneously. The objective of the study are to investigate and evaluate the removal efficiency of both MLVSS and soluble nitrogen by anoxic-aerobic digestion and compared to the aerobic control digesters, with and without lime control. By applying anoxic-acrobic, a comparable MLVSS was gained to aerobic digestion. 66.12% and 63.00% of MLVSS destruction was found in both anoxic-aerobic digesters, with and without methanol addition respectively. Aerobic with lime control tended to have the greatest solids reduction, which was 66.30%. Percent MLVSS reduction in aerobic control digester was 60.76%, the lowest among the digester. There was no unfavorable condition in anoxic-aerobic digesters due to the well maintenance of alkalinity and mixed-liquor pH levels naturally. The endogenous decay coeeficient were found 0.0581 day-1 and 0.0548 day-1 in anoxic-aerobic digester with and without methanol addition respectively, similar rate with lime control digester of 0.0584 day-1 in decay coeffiecient. Nitrate generated in situ due to nitrification was utilized through endogenous nitrate respiration (ENR) during anoxic periods. Thus, reduced nitrates levels in the supernatant in anoxic-aerobic digesters. In this study, it showed that anoxic-aerobic digestion yielded comparable percent solids reduction, despite less energy consumption. It maintained neutral mixed-liquor pH levels without any chemical or lime control. In addition, significant removal of soluble nitrogen and reduced in phosphorus released were realized.
Book Synopsis Operations Manual Anaerobic Sludge Digestion by : Chuck Zickefoose
Download or read book Operations Manual Anaerobic Sludge Digestion written by Chuck Zickefoose and published by . This book was released on 1976 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Potential of Activated Sludge Utilization by : Xiaoyi Yang
Download or read book Potential of Activated Sludge Utilization written by Xiaoyi Yang and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the lack of fossil fuel is increasing, sludge management is not only to satisfy the disposal criteria but also to obtain energy and resources. For better sewage sludge disposal and more efficient energy reclamation, a series of analysis and experiments were performed to study the potential of anaerobic digestion. This book explains biogas outputs in waste sludge treatment. Anaerobic digestion techniques have traditionally been employed to reduce the volume and weight of sludge and produce corresponding amounts of biogas. As most of the organics present in sewage sludge are enveloped by low biodegradability of the cell walls and extracellular biopolymers, the rate-limiting step in sludge digestion is generally believed to be the hydrolysis of particulate organic matter to soluble substance. Novel pre-treatment processes, WAO can improve biogas production. Furthermore, the generalised kinetic model is explored, which is relatively available to predict the WAO process of waste sludge. This book also discusses the values of point-selectivity, which show that there is a strong presence of acetic acid and short chain organic substance in the WAO treatment process, which were experimentally confirmed by chromatogram-mass spectrograph instrument.
