摘要(英) |
Among the various functional deficiencies of wastewater treatment plants, the hardware facilities failure and their improper operations and maintenance are the two major factors. In order to provide a reference for facilities expansion or improvement and to perform excellent operating efficiency of wastewater treatment plants, this study investigated the designed functions and process operating conditions for the case plant by applying CPE (Comprehensive Performance Evaluation) method with performance evaluation of treatment processes.
The results demonstrated that due to lost orders of factories, impact of economic recession, and wastewater recycling, the influent of the plant was gradual decrease. Also, the textile wastewater occupied higher percentage of influent wastewater from factories in industrial parks, resulting in the non-biodegradable and high-colored wastewater characteristics. Based on the results of CPE, the performance of wastewater treatment process was normal and only the improvement of non-structural changes are required to improve functions for some treatment units. However, the performance of sludge treatment process was poor and the related units must have structural changes to be improved. Compared actual operating parameters with designed ones of treatment units, it was suggested to adjust the influent quantities of aerated grit chamber or increase the aeration to reduce the settling of organic solids on the bottom of chamber. On the other hand, the clarifiers had extra capacity due to the over-designed parameters, it was then suggested to change the number of clarifier worked in turns to save the cost of electricity and to reduce the consumption of equipments. With other benefits of improvement, when adopting proper parameters in this plant, the electricity cost could save 0.4 kW-h per ton of wastewater and the sludge production would be reduced at 0.07 kg per ton of wastewater. |
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