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 “"Wastewater sludge"”.
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Wastewater sludge management options for Honduras
Sludge management is a fundamental area of concern across wastewater treatment systems in Honduras. The lack of timely sludge removal has led to declining plant performance in many facilities throughout the country. In addition to maintaining treatment efficiency, proper sludge management is …
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Production of biocoal from wastewater sludge-biomass feedstock
Thesis submitted in fulfilment of the requirements for the degree of Master of Engineering: Chemical Engineering, Durban University of Technology, Durban, South Africa, 2022.
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Anaerobic Co-digestion of Microalgae with Food Waste and Wastewater Sludge
… of microalgae biomass harvested from a wastewater treatment pond facility with locally-available wastes. The goal was to produce high methane yields and stable digestion without the need for supplemental alkalinity addition. A key research question was if algae digestion could be …
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Anaerobic Co-digestion of Wastewater Treatment Pond Algae with Wastewater Sludge
<p>Microalgae harvested from wastewater treatment ponds can be anaerobically digested to produce biogas, a renewable fuel resource. However, past experiments have shown some limitations of algae digestion. Algal cell walls are thought to be resistant to digestion, and the high protein content of …
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Use of a textile wastewater sludge as a supplemental solid fuel
The dried sludge by-product generated by the wastewater treatment system at a textile dyeing and finishing facility in southwestern Virginia is currently disposed of in a conventional landfill. This method represents not only a substantial annual cost, but also a potentially serious environmental …
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Investigating the Role of Various Environment and Process Conditions in Wastewater Sludge Odor Generation
Dewatered sludges and biosolids generated from wastewater treatment facilities are known to emit malodorous odors causing public inconvenience. The odors typically comprise of reduced organo sulfur based compounds and nitrogen containing compounds. Lime stabilization is a technique which is …
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Effects of Anaerobic and Aerobic Digestion at Mesophilic and Thermophilic Temperatures on the Quantity of Carbapenem Resistance Genes in Wastewater Sludge
… carbapenem resistance genes (CRGs) accumulate in sludge during wastewater treatment. Anaerobic and aerobic digestions are commonly used for sludge treatment. Due to the public health relevance of the land application of digested sludge, this research aimed to investigate the effects of the …
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The Effect of Cations on Volatile Solids Destruction, Odors, and Dewatering in anaerobic digestion
… of this 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. …
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Influence of Biosolids upon the uptake of Mn and Cd by Radish (Raphanus sativus L.)
… L</em>.).The biosolid samples from Nacogdoches Wastewater Sludge (NWWS), Lufkin Wastewater Sludge (LWWS), Soil Therapy Compost (STC) had pHs between 5.33 – 6.74. The elemental compositions of the biosolid samples were determined using inductively coupled plasma optical emission spectroscopy …
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Systems engineering analysis of urban region sludge disposal alternatives
… simulation model was developed to compare sludge disposal alternatives for an urban region. The model calculates both capital and operation costs for sludge treatment and disposal operations. For a study of an urban region with an equilibrium wastewater generation rate of 44.74 million …
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Stormwater-borne pollutant export from turfgrass established on soils amended with composted domestic wastewater sludges
… with fertilizer and/or composted domestic wastewater sludge (compost) were evaluated. Three plots were constructed with a Glenelg silty clay soil and seeded with Falcon fescue (Festuca 'Falcon'): Plot 1 received conventional fertilizer; Plot 2 received a combination of compost and reduced …
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The effect of certain sludge floc properties on the dewatering characteristics of biological and chemical waste sludges
… and economical problems associated with sludge handling and disposal have significantly increased in the past years due to: (1) the introduction of more stringent water and air pollution regulations, often requiring the use of processes that produce large quantities of sludge as …
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Physical properties of chemically conditioned sludges
The problems of sludge handling and disposal have significantly increased in the past decade because of more stringent discharge limits which create more disposable sludges and because regulations have been enacted which control the ultimate disposal of sludge residues. These problems have resulted …
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Floating treatment wetlands for synthetic greywaterremediation
… recycling of the major fraction of domestic wastewater, which is grey wastewater, for non‒potable options. The major aim of this study was to evaluate the performance of FTWs for remediation of various pollutants from synthetic greywater. In the present study, a novel synthetic greywater …
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Mechanisms of Methanogenic Inhibition in Advanced Anaerobic Digestion
… high solids digestion of thermally pretreated wastewater sludge (THD) were carried out. Enhanced digestion performance in terms of solids destruction and methane generation by THD relative to MAD was achieved, and was largely attributable to the solubilization and subsequent biodegradation of …
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The Effect of Steady-State Digestion Temperature on the Performance, Stability, and Biosolids Odor Production associated with Thermophilic Anaerobic Digestion
… been shown to have a broad impact on the overall sludge digestion process. Since the current time-temperature requirements for biosolids pathogen reduction are most easily met at elevated digestion temperatures within the thermophilic range, it is certainly worth examining the effect of specific …
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Anaerobic / Aerobic Digestion for Enhanced Solids and Nitrogen Removal
Anaerobic digestion of wastewater sludge has widely been in application for stabilization of sludge. With the increase in hauling cost and many environmental and health concerns regarding land application of biosolids, digestion processes generating minimized sludge with better effluent …
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A technological model for low energy domestic wastewater treatment
… potential for efficient treatment of domestic wastewater, while satisfying energy efficiency requirements. Various treatment systems and the influences of their physical configurations and operational characteristics on wastewater treatment and energy efficiency were initially considered and …
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Resource recovery from sanitation to amplify development: Navigating global and local possibilities
… strategies and products (e.g., reclaimed wastewater, sludge) are locally feasible. Finally, the agronomic value of nutrient application depends upon interactions between product chemistry and soil context. For example, alkaline products (e.g., struvite) may be particularly beneficial when …
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