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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 73 for “"COD removal"”.
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Cod removal, nitrification and denitrification kinetics and mathematical modeling of an integrated fixed film activated sludge (IFAS) system
Biological nitrogen and phosphorus removal are being recommended at several wastewater treatment facilities in the U.S. to control eutrophication in water bodies receiving their effluent. In several instances, nitrogen removal is being recommended on a year round basis at plants located in the …
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Treatment of oil-water emulsion from the machinery industry by Fenton's reagent
<p>The chemical oxygen demand (COD) removal efficiency for treatment of an oil-water emulsion from the machinery industry using Fenton's reagent was investigated. The optimal [H 2 O 2 ]/[Fe 2+ ] molar ratio for COD removal was 3. An orthogonal test was designed based on the optimal molar [H 2 O 2 …
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The effects of nickel on the completely mixed activated sludge process
… to determine its effects on the rate of COD removal. The continuous flow units were operated until steady state conditions were obtained at each mean cell residence time studied and then data were recorded for an approximate 7 days period and averaged to obtain one steady state data …
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Anaerobic treatment of a paper plant effluent
… from the process has a Chemical Oxygen Demand (COD) concentration of approximately 4500 mg/l with a sulphate content of approximately 300 mg SO₄²⁻/l. The upflow anaerobic sludge bed (UASB) reactor was selected for the study. Important information derived from the laboratory treatability study …
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Investigation of the Effects of COD/TP Ratio on the Performance of a Biological Nutrient Removal System
… designed to investigate the effects of changing COD/TP ratios on the performance of biological nutrient removal (BNR) processes. Specific objectives of the research were to investigate the effects of COD/TP ratio on the rates of phosphorus removal, COD removal, nitrogen removal, PHB utilization …
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The Role of Streambed Biofilms in The Removal of Biodegradable Contaminants From Shallow Streams
… streambed biofilms are important in contaminant removal in shallow streams. However, the ability to predict the rate at which this removal occurs did not exist. To develop a model describing streambed biofilm activity, experiments were conducted in an 8-meter long artificial stream to assess both …
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MANGANESE OXIDE AS A NEW CATHODE CATALYST IN MICROBIAL FUEL CELLS (MFCs)
… Power generation and organic substrate removal efficiency of Co-OMS-2 and Cu-OMS-2 were also compared with Pt cathodes in continuous-flow SCMFCs under different hydraulic retention times (HRTs) and chemical oxygen demands (CODs). The 600-hr continuous-flow tests showed that Cu-OMS-2 …
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The Effectiveness of Multiple Redox Treatment Strategies on the Treatability of a High Strength Industrial Wastewater
… 9,000 mg/L as chemical oxygen demand (COD), by three sequencing batch reactor (SBRs) systems operated under alternating redox environments: anaerobic/aerobic (ANA), anoxic/aerobic (ANX), and aerobic was investigated. A synthetic wastewater was modeled after a wastewater from an existing …
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Anaerobic and Combined Anaerobic/Aerobic Digestion of Thermally Hydrolyzed Sludge
… can affect the oxygen uptake capability. Hence, removal of nitrogen from wastewater stream before discharging is important. The main purpose of this study was to evaluate the performance of the Cambi process, a thermophylic hydrolysis process used as a pre-treatment step prior to anaerobic …
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Optimizing high-rate activated sludge: organic substrate for biological nitrogen removal and energy recovery
… upstream of shortcut biological nitrogen removal (BNR) processes as these BNR processes often require a controlled influent carbon to nitrogen ratio that is lower than required for conventional BNR processes. While there is extensive knowledge on conventional activated sludge processes, …
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Evaluating the Source-Effect Relationship of Industrial Toxins in Wastewater Treatment
… were affected by the zinc cyanide 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 …
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Effects of nickel on activated sludge performance at varying COD:TKN ratios
… on activated sludge performance at varying COD:TKN ratios were investigated. Continuous flow, complete mix, bench-scale reactors were operated over a range of mean cell residence times, and COD removal efficiency, biokinetic coefficients, extent of nitrification, and nickel removal evaluated …
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Optimization of Phosphorus Removal and Mineral Characterization in Aerated Anaerobic Digestate with Divalent Cation Addition
… can reduce struvite buildup, enhance phosphorus removal, and provide additional benefits such as nitrogen and COD removal. The pilot setup at Hampton Roads Sanitation District's Atlantic Treatment Plant (ATP) consisted of four 45-gallon tanks operated as daily batch fed continuously stirred tank …
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Pretreatment and biodegradation of wastewater from a textile dyeing and finishing industry
… treatment is often employed to complete organic removal as well as remove toxicity and metals. The wastewater from the textile dyeing and finishing industry studied was not treated efficiently and often failed effluent toxicity and metals tests. In this research project, various pretreatment …
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Effect of phosphorus limiting conditions on process performance in activated sludge
… activated sludge units. Data were collected for COD:P ratios of 287:1, 212:1, 87:1 and 56:1 at several mean cell residence times. Data collected at COD:P ratios of 287:1 and 212:1 produced sludge with extremely poor settling characteristics and data were collected for only one mean cell residence …
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Wastewater Treatment and Nitrogen Removal in Bench-Scale Photobioreactors Operated with Solids Recycling
… recycling on nitrification, organic carbon removal, and algal-bacterial productivity in bench-scale photobioreactors (PBRs) simulating winter pond conditions in San Luis Obispo, California and a 6-acre raceway system in Delhi, California. Two sets of duplicate photobioreactors operated with …
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Anaerobic co-digestion of municipal solid waste and sewage sludge.
… concentration, soluble chemical oxygen demand (COD) removal and total and volatile solids reduction. (Abstract shortened by UMI.)
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The removal of organic waste matter from secondary sewage effluents by chemical coagulation
The removal of organic waste matter was investigated: a) On both a maturation pond effluent and a secondary clarifier effluent, collected from the same municipal sewage-treatment plant, and b) On a maturation pond effluent collected from a different municipal sewage-treatment plant. The inorganic …
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Evaluation and optimisation of the performance of a multi-integrated lab-scale plant for the treatment of dairy wastewater
… production and elevated Chemical Oxygen Demand (COD). Despite subsequent corrections improving system stability, fluctuations persisted, particularly in the Expanded Granular Sludge Bed Reactor (EGSBR). COD removal rates ranged from 60% in week 3 to 26% in week 5, highlighting the system's …
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Effect of the COD:TKN ratio and mean cell residence time on nitrogen removal in the completely mixed activated sludge process
The effect that the COD:TKN ratio had on total nitrogen removal efficiency. as well as, the effect on COD removal efficiency, nitrogen distribution in the effluent streams, and total system mixed liquor suspended solids concentrations in the activated sludge process as a function of the mean cell …
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