Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"organic loading"”.
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Treatment of clam-processing wastewater using upflow anaerobic sludge blanket (UASB) technology
… paper and municipal wastewater industries. High organic strength wastewater, limited space, extended down times and sludge handling and disposal have been critical factors in waste treatment system selection. This study investigated the performance of a laboratory-scale UASB reactor for treating …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
… particularly during the periods of shock organic loadings. Pilot-scale treatment units were set up to study the effects of a fixed film pretreatment on the stability of the AS process, using a new type of trickling filter (TF) media consisting of long plastic strips. The pretreated …
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Sequential temperature phased enhanced anaerobic digestion using bioaugmentation microbes to enhance biomethane production from alkali pretreated late cut grass and late cut grass silage
… uses a consortium of microbes to convert the organic matter to biogas which is primarily made up of methane and carbon dioxide. The technology tackles environmental pollution by reducing the waste going to landfills causing greenhouse gas emissions. Apart from producing biomethane that can …
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Methane Production by a Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water
… for about six months. Over that time, several organic loading rates (OLRs), measured as both chemical oxygen demand (COD) and volatile solids (VS) were applied to the new packed-bed digesters to allow modeling of methane production. The influence of temperature on methane production was also …
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A STUDY OF THE MICROORGANISMS INHABITING ROTATING BIOLOGICAL CONTACTOR BIOFILMS DURING VARIOUS OPERATING CONDITIONS
… occurring in RBC biofilms as a function of organic loading. Biofilms, in pilot-scale RBCs receiving 2.0, 4.0, and 6.0 g TOC/m('2)(.)d of settled domestic sewage, were examined using light and electron microscopy. The microbial community, composed of filamentous and unicellular bacteria, …
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The Influence of Hydraulic Loading Rate on Nitrification Performance in a Two-Stage Biological Aerated Filter Pilot Plant
… the system was operated at different hydraulic loading rates that resulted in a range of applied organic and ammonia mass loadings. Performance was monitored regularly for water quality parameters in the effluent and along the length of the reactors. It was found that nitrification performance …
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The development of process kinetics for a waste treatment system utilizing filamentous microorganisms
… parameters like flow rate, support media area, organic loading, pH, and the BOD-to-nitrogen ratio. Findings of the study indicated that the removal rate, suspended solids concentration in the effluent, and percent COD remaining in the final growth cell of the growth chamber increase as the …
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Upflow anaerobic sludge blanket reactors for treatment of wastewater from the brewery industry
… the supervisory model. Initial perturbations in organic loading rate and influent pH suggest that gas composition and gas production appear to be the best on-line monitoring parameters to indicate changes in reactor conditions.
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Characterization and treatment of organic matter, UV quenching substances, and organic nitrogen in landfill leachates
… although variations in leachate composition and organic loading continue to have negative impacts on downstream treatment processes. Leachate samples were collected from four landfills both before and after on-site treatment to evaluate the extent of biological treatment. The samples vary in age, …
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A Comparative Study of Anaerobic Digestion Processes for Sewage Sludge
… at different solids retention times (SRT) and organic loading rates (OLR). The digesters were fed with mixed primary and secondary waste (50/50 by weight) from the Blue Plains wastewater treatment facility. The digesters were operated until they reached steady state as observed by volatile …
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Characterization, utilization and treatment of mechanized clam processing wastes
… the water volume of water used and the loading of organic material and suspended solids. Disposal of sludges and solid wastes also present problems to the industry. Three processing plants were studied to characterize the nature, sources and variations in waste generation and to evaluate …
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Comparative Studies of Alternative Anaerobic Digestion Technologies
… at varying solids retention times (SRT) and organic loading rates (OLR). The digesters were fed a blend of primary and secondary residuals from the Blue Plains wastewater treatment facility. In each study phase, temperature phased anaerobic digestion was compared to single stage mesophilic …
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Production of biogas from sugarcane wastes: an assessment of microbial community dynamics for an efficient process
… methanogenic community dynamics at high organic loading rate of filter cake and bagasse demonstrated that the genera Methanosarcina and Methanobacterium are the major methanogens that produce biogas, even under process imbalances. Moreover, the results obtained from the process parameters …
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Process simulation and experimental investigation of biofuel production in a high rate anaerobic digestion process
… variables like substrate concentration, organic loading rate, and operating temperature. The third paper focuses on upgrading the biogas quality and quantity in a two-stage expanded granular sludge bed reactor by investigating the effect of injecting the pre-acidification gas (the first …
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Perspectives on third generation gaseous biofuel
… if shorter retention times and higher organic loading rate are required. Average methane yields of 176 and 234 L/kg VS (two stage) and 221 L/kg VS (single stage) were obtained with higher methane compositions than that of the single stage process. H2 and CO2 were used in ex-situ …
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The effect of high purity oxygen on the activated sludge process
… mineral salts was used as the substrate. The organic loading to each reactor was the same and this loading was maintained throughout the research period. Sludge age was used as the control parameter and control was achieved by wasting a specific volume of sludge each day. This procedure …
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On-line measurement of active biomas
… lasting up to 15 days, an increase in organic loading rate was reflected by an increase in catalase activity and increased utilisation of dissolved oxygen. Starvation caused by a decrease in OLR also increased catalase activity by up to seven times within 36 hours. The catalase activity …
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Using Free Water Surface Constructed Wetland for the Mitigation of High PH Secondary Effluent From Municipal Wastewater Treatment Plant
… was undertaken under different HRTs and organic loading rates (OLRs). The results showed that peat exhibited the best pH attenuation capacity, and the pH attenuation performance could be substantially improved when the OLR was increased over 70 mg/L COD with a HRT longer than 4 days. The …
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Cellulose mineralization in two-stage anaerobic digestion systems
… retention times (HRTs), feed concentrations and organic loading rates (OLRs). The emphasis of this research was to characterize the similarities and differences between these two processes;The acid-methane system consisted of two consecutive reactors, an acidogenic reactor and a methanogenic …
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Biomethane production from grass silage: laboratory assessment to maximise yields
… in mono-digestion of grass silage at a high organic loading rate (OLR) of 4.0 kg VS m-3 d-1. The addition of a slurry co-substrate was beneficial due to its wealth of essential trace elements. To stimulate hydrolysis of high lignocellulose grass silage, particle size reduction (physical) and …
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