A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 35...A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent meas of CODCr,, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.展开更多
The design scale of a sewage treatment plant in the industrial center of a district in Changzhou is 2×10^(4) m^(3)/d. Data analysis, process selection and analysis and main structure design were carried out for t...The design scale of a sewage treatment plant in the industrial center of a district in Changzhou is 2×10^(4) m^(3)/d. Data analysis, process selection and analysis and main structure design were carried out for the sewage treatment plant to ensure that the effluent quality meets the discharge standards. The operation results after the implementation of the project show that the project can effectively improve the effluent quality of the sewage treatment plant. The removal rates of COD, NH+4, TN and TP are 93.97%, 98.63%, 82.67% and 97.37% respectively, and the effluent quality can be discharged stably up to the standard. Using cost analysis to study the operation of the sewage treatment plant, the results show that the total investment of the sewage treatment plant is 40 million yuan, the electricity cost of this project is 0.426 yuan/m^(3), the pharmaceutical cost is 0.655 yuan/m^(3), and the material replacement fee is 0.323 yuan/m^(3). The direct operating cost is 1.404 yuan/m^(3). This method has good practical guiding significance for the optimization and operation transformation of the same type of sewage treatment plants.展开更多
文摘A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent meas of CODCr,, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.
文摘The design scale of a sewage treatment plant in the industrial center of a district in Changzhou is 2×10^(4) m^(3)/d. Data analysis, process selection and analysis and main structure design were carried out for the sewage treatment plant to ensure that the effluent quality meets the discharge standards. The operation results after the implementation of the project show that the project can effectively improve the effluent quality of the sewage treatment plant. The removal rates of COD, NH+4, TN and TP are 93.97%, 98.63%, 82.67% and 97.37% respectively, and the effluent quality can be discharged stably up to the standard. Using cost analysis to study the operation of the sewage treatment plant, the results show that the total investment of the sewage treatment plant is 40 million yuan, the electricity cost of this project is 0.426 yuan/m^(3), the pharmaceutical cost is 0.655 yuan/m^(3), and the material replacement fee is 0.323 yuan/m^(3). The direct operating cost is 1.404 yuan/m^(3). This method has good practical guiding significance for the optimization and operation transformation of the same type of sewage treatment plants.
