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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 22 for “"clarifiers"”.
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The influence of denitrification in clarifiers on biological phosphorus removal at CCSD plant
… about denitrification occurring in secondary clarifiers. In this study an attempt was made to study denitrification occurring within a secondary clarifier at the Clark County Sanitation District (CCSD) wastewater treatment plant, Las Vegas. The results obtained from this study showed that …
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PARTICLE REMOVAL IN FLOC BLANKET CLARIFIERS VIA INTERNAL FLOW THROUGH POROUS FRACTAL AGGREGATES
… of primary particle removal in floc blanket clarifiers was characterized via size-based performance curves obtained from light blocking particle counters that measured the effluent of a laboratory-scale floc blanket clarifier treating synthetic raw water. Particle capture was first order with …
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Effects of storage on water treatment plant sludges
… and TOC removal of water treatment plant (WTP) clarifiers and on the dewatering characteristics of sludge were examined. The use of chlorine dioxide as a preoxidant to retard observed detrimental effects was also investigated. Sludge samples that were stored over a period of 120 days were found …
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Evaluation of factors affecting the performance of biological phosphorus removal in a full-scale wastewater treatment plant
… RAS, and strong denitrification in the secondary clarifiers were identified as potential causes for the occasional excursions. A correlation was found between TSS and nitrate concentrations in the RAS, indicating that the former may serve as a good parameter for controlling denitrification in …
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Secondary Clarifier Modeling: A Multi-Process Approach
… processes and solids distribution on secondary clarifiers. When the model is executed with the field derived settling characteristics, it can accurately predict the effluent and recirculation suspended solids concentrations. The model has been formulated to conserve fluid, tracer and solids …
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Utilization of a combined activated sludge fixed film media system for treatment of a high strength, high ammonia, industrial wastewater
… can result in smaller aeration basins and clarifiers in places of land scarcity.
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A laboratory study on the anaerobic digestion of yeast waste
… factory, to anaerobic digestion. The reactor-clarifiers were constructed and operated at a wide range of loadings. A constant hydraulic retention time was maintained for each of the digesters and sufficient sludge withdrawn daily to maintain a constant sludge concentration over the range of …
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Seasonal influent characterization, model calibration, SRT and energy usage for nitrogen removal at a full scale wastewater plant
… imposes higher solids loading rates on secondary clarifiers and potentially higher rates of oxygen demand. The effects of different SRT values on the denitrification and solids loading rates were investigated using BioWinTM simulator calibrated based on the COD characterization work. It was …
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The effects of a phosphate detergent ban on a biological nutrient removal plant and anaerobic digester
… was primarily due to improved operation of the clarifiers and sludge thickeners, which delivered Similar phosphorus loads to the digester in the pre- and post-ban periods.
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The catalytic oxidation of manganese in water treatment clarification processes
… manganese in water treatment floc blanket clarifiers has been studied. The removal mechanisms may be broadly classed as adsorption and oxidation. Adsorption of manganese (II) occurs rapidly and is completed in less than five minutes under conditions prevailing in a floe blanket clarifier. …
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Using Coagulation to Enhance the Performance of Filtration at the South Truckee Meadows Water Reclamation Facility
… Reservoir and the effluent from the secondary clarifiers to determine the coagulant dosages and the pH conditions for optimum coagulation to enhance the performance of the existing Parkson DynaSand® upflow filters. Five different coagulants were tested including aluminum sulfate, ferric …
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Cod removal, nitrification and denitrification kinetics and mathematical modeling of an integrated fixed film activated sludge (IFAS) system
… regarding the cost of additional reactors and clarifiers required for nitrogen removal in winter using activated sludge systems. Several facilities do not have the space to construct additional units. This research was undertaken to evaluate the potential for reducing reactor and clarifier …
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Microbial flocculation for large scale harvesting of marine microalgae for the production of biodiesel.
… plant in Bolivar showed that by incorporating 2 clarifiers and 1 baffled hydraulic flocculator in the plant design, industrial scale harvesting was feasible with a theoretical energy consumption of 2.6 kWh per 10⁴ m³ of culture media. Raw materials were the major cost, however, they could be …
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Filamentous Foaming in Activated Sludge Systems: A Study Combining Molecular and Engineering Approaches
… on the surface of aeration basins and secondary clarifiers. These viscous foams cause various operational problems, and have been associated with the presence of filamentous mycolic acid-containing actinomycetes (mycolata) and ""Microthrix parvicella "". However, the relationship of filament …
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Water chemistry characterization and component performance of a recirculating aquaculture system producing hybrid striped bass
… cycles were population dependent. Multi-tube clarifiers removed an average 56% of all suspended solids in a single pass with 81 % removal efficiency for particles above 70 microns in size. Analysis of the system effluent generated by the clarifier indicates a high degree of similarity between …
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Impact of daytime nitrogen limitation on structure and function of mixed microalgal communities derived from three geographically distinct sources
… mixed microbial communities sourced from WWTP clarifiers and/or surface water in one of three different geographic locations of the United States (Florida, North Carolina, Illinois) were operated in sequencing batch mode with an 8-day solids residence time (SRT) and 14hr:10hr light:dark cycle …
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Temporal biomass density and filamentous bacteria effects on secondary settling
… This leads to requirements for larger clarifiers, increased pumping costs of the diluted settled solids stream, and increased costs for solids treatment. For the past thirty years, the majority of the research in secondary settling problems has focused on the role of filamentous …
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Optimization of intermittent aeration for increased nitrogen removal efficiency and improved settling
… Activated Sludge (HRAS) plant with no primary clarifiers operating at an SRT of 1.5" 2 days without biological nitrogen removal (BNR). BNR is considered more cost-effective than comparable chemical and physical processes, but it requires considerable resources to meet increasingly strict …
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Supramolecular polymer additives to improve the crystallization behavior and optical properties of polybutylene terephthalate and polyamides
… polyamides were clarified. The most efficient clarifiers for PA6 were found to decrease the values for haze from nearly 100 % (1.1 mm thick samples) for neat PA6 to 19 % and 11 % at a concentration of 1.5 wt%. By varying the peripheral substituents of the trans-bisureas interesting structure …
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Applications of aerobic and anaerobic bacteria in the fields of biological degradation of contaminants and biological wastewater treatment
… Aeration Lagoons with Activated Sludge and two Clarifiers, one for the Activated Sludge and the second for the dosing of Aluminium-Sulphate and the removal of Phosphat-Sulphate. Biological processes for the removal of carbon- and energy-sources were optimised and biological processes for the …
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