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 24 for “"dewaterability"”.
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Thermal hydrolysis and thermal alkaline pretreatment of waste activated sludge: comparison of effects on biogas yield, dewaterability, sludge liquor and cost-benefit analysis
Aim of this dissertation was to investigate effect of process conditions (T, pH) of thermal alkaline pretreatment (TAP) and thermal hydrolysis (TH) of waste activated sludge (WAS) on biogas yield increase, dewatering potential of digestate, return load increase and refractory COD using same sludge. …
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Effect of Process Intensification Techniques on Biosolids Management
… in terms of anaerobic digestion enhancement, dewaterability improvement, odor mitigation, as well as phosphorus and nitrogen removal. The first part of this study was conducted to understand the effect of anaerobic digester solids retention time (SRT) on odor emission from biosolids. A kinetic …
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Wastewater Carbon Diversion and Recovery via Primary Sludge Production, Thermal Hydrolysis, and Anaerobic Digestion
… sludge production and blending, digestibility, dewaterability, and dewatered cake odor emission control. A comprehensive literature review showed that iron-based coagulants tend to show less negative impact than aluminum-based coagulants. This can be attributed to the reduction of ferric to …
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The Effect of Using Bioflocculants as Conditioners on Dewatering of Biosludge
… the application of biopolymers for enhancing the dewaterability of biosludge and the underlying mechanisms in this process. This thesis explored the possibility of employing biopolymers such as hemoglobin (Hb), lignin-based flocculants (LBFs), and protamine to enhance the dewaterability.Cationic …
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An evaluation of a heat syneresis process on domestic U.S. sewage sludges
… The heat treated sludge was then cooled and its dewaterability measured by both filter leaf and specific filtration resistance tests. The primary sludge exhibited a marked improvement in filterability when held at a temperature of 170 to 185 °C for 20 minutes or more. The 1:1 mixture of primary …
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Improving Anaerobic Digestion of Sewage Sludge Using Free Ammonia Pretreatment
… of the volatile solids (VS) destruction, dewaterability, pathogen removal, and its implications. In comparison to the control (without FA pretreatment), FA pretreatment (560 mg NH3-N/L, 24h) enhanced the VS destruction of primary sludge by 12%, which is related to the 31% of enhancement in …
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The Effect of Cations on Volatile Solids Destruction, Odors, and Dewatering in anaerobic digestion
… volatile solids destruction, odor control, and dewaterability. The role of influent feed cations and addition of chemical coagulants to sludge were evaluated for those characteristics following anaerobic digestion. Wastewater sludge samples were obtained from seven municipal wastewater treatment …
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The effect of a large anoxic mass fraction and concentrations of nitrate and nitrite in the primary anoxic zone on low f/m filament bulking in nutrient removal activated sludge systems
… sludge process, but it also causes poor dewaterability of the waste activated sludge. Clearly bulking not only adversely affects the efficiency of the secondary settling tank but also the efficiency of the sludge treatment units at the plant. While controlling or eliminating bulking at …
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Polyelectrolyte conditioning of ferric sulfate sludge
… successfully condition the sludge to improve its dewaterability. In addition the parameters which affected the conditioning mechanism. were investigated. Tests that were run during the investigation included specific resistance, COD, total and volatile solids, zeta potential and pH. …
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The effect of mean cell residence time on the dewatering characteristics of a biological sludge
… that mean cell residence time (MCRT) had on the dewaterability of biological sludges was examined in this study. Aeration basin sludge and waste activated sludge from a full scale domestic wastewater treatment facility, in addition to sludges produced from two laboratory scale reactors fed with a …
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Ecological studies on high-rate biological filters with special reference to microbial biosynthesis and nitrification
… applied to the filters was related to sludge dewaterability, with the most readily conditionable sludges produced by filters supporting heavy film. Sludges produced by random-fill media could be dewatered as readily as those produced by low rate filters treating the same sewage. Laboratory …
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The stoichiometry and kinetics of biological heat generation in the aerobic stage of dual digestion
… of operation to prevent recontamination, (5) dewaterability of the anaerobically digested sludge, (6) operation and economic evaluation of the system. In this thesis, the results obtained pertaining to operation and performance of the Milnerton aerobic reactor are presented in detail. Also, …
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Optimizing high-rate activated sludge: organic substrate for biological nitrogen removal and energy recovery
… pilot process. To ascertain the settling, dewaterability, and digestibility of the sludge produced by the pilot A-stage process, several standardized and recently developed methods were conducted. The results from these tests indicated that the A-stage had similar dewaterability and …
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Evaluating the Source-Effect Relationship of Industrial Toxins in Wastewater Treatment
… complex, while COD removal, effluent TSS and dewaterability were not. Recovery was seen in less than 2 X solids residence time (SRT) for the nitrifying biomass and within 3 X SRT for the non-nitrifying biomass. The results of the pH experiment showed that the pH 11 shock affected the …
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Anaerobic Co-digestion of Wastewater Treatment Pond Algae with Wastewater Sludge
… yield, volumetric methane production, and the dewaterability of the digester effluents. Co-digestion of algae with sludge was stable, with healthy pH, at all algae/sludge ratios with OLRs up to 4 g volatile solids loaded per liter digester per day (g VS/L-d) at a 20-d HRT. For digesters fed …
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Conventional and Advanced Thermal Hydrolysis in Sewage Sludge Pre-treatment
… utilisation as fertiliser and improves sludge dewaterability. However, the requirement for high reaction temperatures presents drawbacks to the technology. At temperatures exceeding 150 ℃, the colour of the sludge darkens. This dark brown hue could impede the UV disinfection phase of wastewater …
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Anaerobic / Aerobic Digestion for Enhanced Solids and Nitrogen Removal
… - greatly reduced protein, resulting in improved dewaterability and less polymer demand. An/Aer/An (both of the options: A and B) had lower CST than single MAD (both 15d and 20d SRT) and Ana/Aer. Compared to Ana/Aer, a reduction of 52% for An/Aer/An – A and 20% for An/Aer/An – B in polymer dose …
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Upgrading biomass by hydrothermal and chemical conditioning
… value and ash than raw sludge. Moreover, the dewaterability can be increased greatly by treating waste water sludge with subcritical water.
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Procesos alternativos para el tratamiento a alta presión de lodos edar
… order to improve sewage sludge solubilization, dewaterability and biodegradability. In this work, ATH process proved to be a promising alternative from the energy saving and recovery point of view [in the sense of expediting methane (CH4) production in the AD]. A wide range of operating …
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Biodegradation and Dewatering of an Industrial Waste Oil
Waste oil generated from industrial operations at a diesel locomotive maintenance facility was investigated to establish its treatability and potential volume reduction. The waste oil and water mixture separated into four distinct layers; free oil, emulsified oil, weathered oil, and wastewater. The …
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