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 29 for “"digested sludge"”.
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Factors affecting the filtration characteristics of aerobically digested sludge
The cost of handling and disposal of sewage sludge is a major expense in sewage treatment. Often half of the treatment plant expense is in the purchase and maintenance of sludge handling equipment. The sludge problem becomes particularly acute with activated sludge processes because of the large …
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Characteristics and conditioning of anaerobically digested sludge from a biological phosphorus removal plant
A study of the anaerobically digested sludge form a full-scale biological phosphorus removal (BPR) plant (York River Wastewater Treatment Plant, York River, Va.) was conducted to determine the effects of BPR on sludge characteristics and conditioning requirements. Data collected from the plant …
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Evaluation of Sewage Digested Sludge Conditioning and Dewatering Through Qualitative and Quantitative Laboratory Methodologies Towards Process Monitoring
… the nature, related storage and processing of digested sewage sludge can influence polymer conditioning and dewatering. The work concentrated more specifically on evaluating the impact of thermal hydrolysis as a pre-treatment to anaerobic digestion (AD) of mainly secondary sewage sludges …
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Prediction of struvite formation potential in Ebpr digested sludge using mass balances, batch precipitation tests, and chemical equilibrium modeling
Digested sludge liquors from wastewater treatment plants that include enhanced biological phosphorus removal (EBPR) in their treatment process have the potential to form struvite (MgNH4PO4·6H 2O). The potential can be determined by the concentrations of struvite constituents including …
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Dewatering Of Biosolids By Sodium Ferrate
… hypochlorite were used. Samples of anaerobic digested sludge and waste activated sludge with solids content of 2.1% and 0.95 %, respectively were conditioned with both products to evaluate and compare their effectiveness. Centrifugation and filtration of the sludge after conditioning were …
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Rheological examination of domestic sewage sludge
… parameters involved in the transportation of sludge from the place of origin to the place of disposal has long been a problem to the sanitary engineer. To obtain the greatest efficiency in the design of pumps and pipelines the properties of sludge need to be thoroughly understood. This …
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The Effect of Sewage Treatment Processes on The Viability of Taenia Taeniaeformis Ova and Embryonation of Toxocara Canis and The Effect of Soil Treated With Dried or Liquid Anaerobically Digested Sludge on Embryonation of Toxocara Canis Ova
… temperature (23 C) in raw sewage or activated sludge showed a significant decrease in viability from those in saline. In contrast, the ova of Toxocara canis kept under the same conditions did not show any significant difference from those in control experiments.
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The Effect of Temperature on Lignin Degradation in Municipal Solid Waste
… preheated and then inoculated with anaerobically digested sludge. Newspaper in distilled water exposed to 95°C for 48 hours released 8 times more of solubilized lignin then non preheated newspaper. Moreover lignin monomers were detected as a result of 95°C pretreatment indicating the positive …
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Conditioning for shear in sludge dewatering
… agents and mechanical dewatering devices affect sludge dewatering with respect to shear. Bench scale experiments were performed to determine the effect of shear and mole charge on polymer dose requirements using anaerobically digested sludge. Lime, ferric chloride, and polymer were used to …
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Utilization of Ultraviolet-Visible Spectroscopy and Rheology for Sludge Characterization and Monitoring
Operation of sludge treatment processes mainly relies on manual control, which is far from ideal. There is a need for new approaches to optimize the design and operation of sludge treatment processes and wastewater plants. This research aims to identify new tools and methods that can be used for …
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Hydrothermal Processes Applied to Sludge Reduction
Conventional Activated Sludge (CAS) systems have been widely implemented to treat wastewater. CAS systems produce huge amounts of waste sludge and its subsequent treatment represents up to 65 % of the operational costs of Waste Water Treatment Plants. The final disposal of sludge is usually …
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Toxicity characteristic leaching procedure analysis of dye containing sludges
… to leach dyestuffs contained in municipal sludge using the Toxicity Characteristic Leaching Procedure (TCLP) was investigated. In addition to the dyestuffs, metals and other organic compounds which also leached were identified. Only small amounts of color were detected in the TCLP extracts; …
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The Effect of Cations on Volatile Solids Destruction, Odors, and Dewatering in anaerobic digestion
… study is to understand the effects of wastewater sludge feed cations on 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 …
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Estudio comparativo de diferentes tecnologías de higienizacion de lodos de depuradora con fines para su reutilización
… In this research we worked with three digesters, sludge with a volume of 130 L and the actual volume of treatment of 100 L, of which two reactors working under mesophilic conditions (35 º C), and the third digester under thermophilic conditions (55 ° C), the three were fed with biological sludge …
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Bioflocculation: Implications for Activated Sludge Properties and Wastewater Treatment
… the role of bioflocculation in the activated sludge unit processes. Laboratory and full-scale studies revealed that bioflocculation is important in determining settling, dewatering, effluent and digested sludge properties (activated sludge properties) and may be vital to the function of all …
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Experimental and CFD–PBM investigation of an agitated bioreactor using a dual helical ribbon impeller
… The by-product of an anaerobic digester is solid sludge that can be used as either fertilizer or compost. Anaerobic digestion biogas plants can benefit industries by adding value to solid organic waste, reducing fossil fuel usage, eliminating solid waste disposal costs, in addition to generating …
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The effect of polymer dose and mixing intensity on sludge dewatering with a plate and frame filter press
Experiments were performed with anaerobically digested sludge and a plate and frame filter press to determine filter press performance over a range of polymer doses and under a variety of sludge and polymer mixing conditions. In addition, bench-scale polymer dosing and mixing experiments were …
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The stoichiometry and kinetics of biological heat generation in the aerobic stage of dual digestion
… anaerobic digestion is the preferred method of sludge stabilization. Accordingly, from 1981 to 1984 under WRC sponsorship, the Johannesburg City Council (JCC) undertook a pilot plant study into the performance of the autothermal thermophilic aerobic reactor oxygenated with pure oxygen. As a …
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Hydrothermal liquefaction for energy recovery from high-moisture waste biomass
… included Spirulina algae, swine manure, and digested anaerobic sludge. Bulk biocrude oil properties (e.g., oil yield, elemental analysis, higher heating value) and physico-chemical characteristics (e.g., molecular constituents, functional group allocation, proton and carbon speciation, …
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Effect of Addition of High Strength Food Wastes on Anaerobic Digestion of Sewage Sludge
Anaerobic co-digestion of municipal sludge and food wastes high in chemical oxygen demand (COD) has been an area of interest for waste water treatment facilities looking to increase methane production, and at the same time, dispose of the wastes and increase the revenue. However, addition of food …
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