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 27 for “"solids removal"”.
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Evaluation of Nutrients and Suspended Solids Removal by Stormwater Control Measures Using High Flow Media
… area were monitored over 11 months to assess the removal of Total Suspended Solids (TSS), Nitrogen, and Phosphorus in First Flush (FF) stormwater runoff. Excellent removal of TSS and particulate-bound nutrients was noted, but, in most SCMs, removal of dissolved species was limited. Sorption of …
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Effect of Long-Chain Fatty Acids on Anaerobic Digestion
… from 5% to 20% on a weight basis and the pH, solids reduction and COD reduction were determined. The results suggested that in addition to degrading in the digesters, all unsaturated acids contributed additional solids removal, compared to the control group. In contrast, stearic acid did not …
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Liquid and solids management impact on nutrient ratios for in-line wastewater prefermenters
… rates, regulated at 0.7,2.2 and 3.7 kg sludge solids/m3 raw sewage. The corresponding sludge ages at these elutriation rates were calculated as 17.3, 2.5 and 7.5 days. At all three operating conditions the TKN/COD ratio increased (64, 46 and 20% respectively), with an average ratio of 0.057 mg …
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Dissolved air (pressure) flotation
… thesis investigates those parameters influencing solids removal and thickening by dissolved-air (pressure) flotation and the criteria pertaining to the design of flotation tanks for solids removal and thickening. A review of pertinent literature on flotation is presented. The historical …
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Use of polymers and a surfactant in the treatment of Kraft process wastewater
… polymers, and a surfactant, EHDABr, in the color removal treatment of Kraft pulp and paper wastewater. Four polymers were evaluated for their color removal performance by jar test procedures. The polymers removed between 77 and 87% of the wastewater color. The affect of pH upon polymer performance …
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The use of a water quality model to evaluate the impacts of combined sewer overflows on the lower Hudson River
… processes, including floatables and suspended solids removal. Few studies have been conducted in the area of the impacts of CSO discharge on the receiving water quality. To achieve this purpose, a powerful water-modeling tool, WASP 6.1, is utilized in this study. The Lower Hudson River is …
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Laboratory studies using sodium-bearing waste simulant - ADL 26-94
… conditions for each parameter to achieve optimal solids removal rates and resistance to filtration. The organic polymers were gauged by their ability to properly condition the sludge by use of capillary suction time (CST) apparatus and wedge zone simulator (WZS). Low impeller mixing speeds cause …
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Contaminant removal from impervious pavements and its relationship with raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater pH
The relationships between contaminant removal from impervious pavements and raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater fit were evaluated. A commercial urban area was chosen to perform simulated rainfall experiments. The runoff from these experiments was …
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A methodology for the design of wet detention basins for treatment of highway stormwater runoff
… the settling velocity distributions of suspended solids to refine a methodology selected by the FHWA in designing wet detention basins for the treatment of highway stormwater runoff. Thirteen runoff samples were collected, over two years, from high volume (greater than 100,000 vehicles per day) …
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Characterization, Treatment, and Improvement of Aquacultural Effluents
… cleaning, etc.). Normalized Total Suspended Solids (TSS) concentrations were found to be as high as 115 mg/l during harvesting and 63 mg/l during feeding. Solids characterization studies proved farm waste solids degrade over time and that their particle size distributions are a function of …
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Variations of Vibrio Populations in Pacific White Shrimp, <i>Litopenaeus vannamei</i>, Aquaculture Raceways
… data were compared to two levels of bio-floc solids removal in addition to physical and chemical tank parameters such as temperature, ammonia, nitrite, nitrate and phosphate. The total bacteria gene copy abundances were higher (<em>p</em> = 0.0081) in the low solids tanks but the quantity of …
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A study of multi-stage sludge digestion systems
… digestion systems were studied to evaluate their solids reduction, odor generation after centrifugal dewatering and indicator organism reduction in comparison to single-stage thermophilic and/or mesophilic anaerobic digestion systems. Pre-aeration of sludge in a thermophilic temperature was also …
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Comparison of Biological Aerated Filter (BAF) performance using two granular sunken media at low organic and hydraulic loadings
… thrice a week to evaluate carbon oxidation, solids removal and nitrification. In order to evaluate system recovery when BAFs are operated intermittently, a drying cycle of eleven days was introduced. Both media performed satisfactorily with respect to carbon oxidation and nitrification. On …
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The use of advanced treatment methods for removal of color and dissolved solids from pulp and paper wastewater
… use of activated carbon and ion exchange for the removal of color and dissolved solids from pulp and paper wastewater generated by the Union Camp Corporation mill in Franklin, Virginia. The objective of the treatment was to provide a high quality effluent suitable for direct recycling. This …
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Effects of Thermal Hydrolysis Pre-Treatment on Anaerobic Digestion of Sludge
… based on various characteristics including pH, solids removal, COD removal and gas production. The study was conducted in two phases to investigate the effect of change in mesophilic temperature (37°C and 42°C) and the effect of solids retention time (SRT) (15 days and 20 days). Thermally …
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Evaluation on an on-site stormwater treatment device for sediment flux mitigation in the Lake Tahoe basin
… of a full scale device model was performed. Removal efficiency, effluent concentration, and bulk solids removal were assessed for perfomance evaluation. The device demonstrated a median removal efficiency from grab samples of 74%, median total suspended solids effluent concentration of 72 …
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Simulations and modeling of biomass gasification processes
… of trying various test conditions for the solids removal and scrubbing (condensation) systems. The model as it is currently formulated is not capable of predicting gasification output mixture compositions. It is desirable to decrease the amount of carbon dioxide and tars (defined for this …
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Denitrifying woodchip bioreactors for aquaculture manifold design and potential water reuse
… Bioreactors are highly effective at nitrate removal via the process of denitrification but have also demonstrated a propensity for premature system failure as characteristics unique to wastewater may clog a bioreactor’s inlet. Another challenge for this application is that bioreactor outflows …
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Nitrogen Removal From Dairy Manure Wastewater Using Sequencing Batch Reactors
… parameters associated with nitrogen removal from the wastewater, as well as to demonstrate experimental and simulated nitrogen removal from the wastewater. The characterization showed that all the wastewaters had carbon to nitrogen ratios large enough for biological nitrogen removal. …
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Increased Anaerobic Digestion Efficiency via the Use of Thermal Hydrolysis
… thermal hydrolysis has been shown to increase VS removal, COD removal and biogas production. The sludge generated also dewaters to a higher cake solids than from conventional anaerobic digestion. Unfortunately, DC WASA has found that the use of thermal hydrolysis had brought about two major …
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