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 152 for “"chemical oxygen demand"”.
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Manual and Automated Measurement of the Chemical Oxygen Demand (COD) of Wastewaters
… in the United Kingdom and the usefulness of oxygen demand tests to measure the organic pollution is outlined. Because oxyeen demand tests are arbitary the relative merits and shortcomings of the commonly used tests are discussed, as are some new techniques for measuring organic pollution.The …
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Characterization and treatment of spent vegetable tan liquors
… the effect of aeration in combination with chemical coagulation on the treatment of spent vegetable tan liquor. Chemical coagulation was desirable because it effectively reduced the color and suspended solids of the tanning waste. Aeration was thought to be a possible means of reducing the …
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An evaluation of polyelectrolytes in the chemical treatment of textile mill wastes
… of polyester fibers, disperse dyes, with complex chemical carriers and surfactants have been introduced. These dispersing agents inhibited chemical treatment and passed through biological facilities untreated. Therefore, it was the purpose of this study to ascertain whether chemical treatment with …
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The Kinetics of Particulate Substrate Utilization by Bacterial Films
… capable of describing the removal of particulate chemical oxygen demand (PCOD) from wastewaters in biological film systems. In this context, organic particles that are maintained in suspension (i.e., not removed during normal settling) are the focus of experimentation, modeling, and discussion. …
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Efficiency of soil aquifer treatment in the removal of wastewater contaminants and endocrine disruptors. A study on the removal of triclocarban and estrogens and the effect of chemical oxygen demand and hydraulic loading rates on the reduction of organics and nutrients in the unsaturated and saturated zones of the aquifer.
… conditions. Investigation of the removal of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Dissolved Organic Carbon (DOC), nitrogen and phosphate in a 2 meter long saturated soil column under a combination of constant hydraulic loading rates (HLRs) and variable COD …
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Agricultural and forest land runoff in upper South River near Waynesboro, Virginia
… at sampling stations in the basin included chemical oxygen demand, total suspended solids, turbidity, specific conductance, total phosphorus, total Kjeldahl nitrogen, nitrate, and iron. These data were used with flow and drainage area data to determine the relative magnitude and daily yields …
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Managing landfill leachate using biological approach
… used for leachate characterization were chemical oxygen demand measured via Reactor Digestion method and ammonia nitrogen concentration measured via Nesslerization method. Besides that,the heavy metals content in the leachate sample were measured via Atomic Absorption Spectroscopy. The …
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Effects of seasonal changes on the depletion of microflora in natural wetlands in Northern KwaZulu Natal
… of the natural ecosystems. Various physiochemical parameters and microbial communities were evaluated at Lake Cubhu to determine the effects of seasonal changes on the microbial community structure of this lake. Lake Cubhu wetland is a sub-catchment within the Mhlatuze catchment and it is …
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Applications of microwave technology to wastewater treatment
… in terms of orthophosphate, ammonia and soluble chemical oxygen demand, were obtained at treatment temperatures of 40 ºC, the yields decreased as the temperature was increased. The highest yields of solubilization were obtained at 60 ºC for orthophosphate, and at 80 ºC for both ammonia and …
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The Effect of Thermophilic Anaerobic Digestion on Ceftiofur and Antibiotic Resistant Gene Concentrations in Dairy Manure
… ii) waste stabilization in terms of solids and chemical oxygen demand, iii) change in mass of Ceftiofur and iv) change in concentration of antibiotic resistant genes, specifically cfx(A), mef(A), and tet(Q). There was statistically significant decrease in cumulative gas production due to the …
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Stormwater Runoff from Elevated Highways: Prediction of COD from Field Measurements and TSS
… focused on the prediction and identification of chemical oxygen demand (COD) concentrations in storm water runoff from elevated roadways, which transports a significant load of contaminants. The objective of this research was to develop a mathematical model to relate COD concentration to …
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Analysis of temporal trends in southern Nevada wastewater pond parameters with an emphasis on ammonia removal
This paper examines physico-chemical and biological properties and processes in four Southern Nevada wastewater pond systems located in Alamo, Beatty, Blue Diamond, and Searchlight. Pond parameters examined include pond dimensions, hydraulic retention time (HRT), alkalinity, pH, chemical oxygen …
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Dissolution and Biokinetics of PCL in Denitrification Systems
… and bead reuse on PCL dissolution and soluble chemical oxygen demand (SCOD) release. The dissolution behavior was represented using a modified Noyes-Whitney model, which was calibrated to capture the kinetics and predict carbon release over time. Many previous studies have overlooked the …
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Anaerobic treatment of a paper plant effluent
… waste paper. 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 …
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Preliminary Experiments on Photo-Electro Catalytic Oxidation of Recalcitrant Organic Compounds Dissolved in Water
… were determined by total organic carbon and the chemical oxygen demand. Calculations of the final rate constants show that lighter molar concentrations have higher rates of degradation.</p>
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Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
… resulted in an increase in effluent chemical oxygen demand (COD). The increase in effluent COD was not accompanied by a similar increase in effluent biological oxygen demand (BOD), indicating that the EMPs released were resistant to biodegradation. At the highest SRT, the resistance …
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Anaerobic co-digestion of municipal solid waste and sewage sludge.
… were evaluated: thermal, alkaline and thermochemical. Using a central composite experimental design, two factors were studied, the total solids content of the feed and its particle size. For all three pretreatments, second order empirical models were developed with respect to common …
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Eletro-oxidação de efluente contendo nitrogênio amoniacal na presença de cloreto
… ammoniacal nitrogen was higher than 90% and the Chemical Oxygen Demand (COD) higher than 80%, for both sells. These results indicated that tratament is efficient to reduce the concentration of inorganic and organic pollutants presents in the sample. The Ti/RuO2 anode presented better corrosion …
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The removal of organic waste matter from secondary sewage effluents by chemical coagulation
… operation. Removal was evaluated in terms of Chemical Oxygen Demand (COD) of the wastewater. It was found that, among the inorganic coagulants tested, ferric chloride was, in all cases, the most effective coagulant for COD removal. In general, the final COD achieved with ferric chloride was …
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Pilot-scale study on anaerobic/aerobic treatment of a textile dye wastewater
… for: color, total organic carbon (TOC), 5-day biochemical oxygen demand (BODs), chemical oxygen demand (COD), total phosphorus, sulfide, sulfate, total Kjeldahl nitrogen (TKN), ammonia, nitrate, chloride and oxidation-reduction potential (ORP). Nearly 50% color removal was observed during …
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