| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 99 === Water is one of the most important natural resources mankind needs, while the electric power is the base of industrial development. Both of the two also provide what people need in daily life and necessaries for mankind. Therefore, this research combined the author’s job and used the operation of Dashu wastewater treatment plant as example to discuss the performance promotion and measure improvement of energy conservation. Currently the influent flowrate is only 23% of the original design, furthermore, the discharge does not have to meet the nutrient requirements of nitrogen and phosphorus. It is expected that, through the adjustment of unit operation and process, performance and be enhanced and energy can be saved.
In this study, biological treatment units are the focus of operation adjustment, which contributes about 37% of power consumption of the whole plant. The original design of A2O processes are adjusted to the activated sludge system for energy saving. In consideration of the consistency and stability of the evaluation, data collections are arranged at the same period of the year, i.e., operation of A2O system mode from June to November, 2009 and operation of activated sludge mode from June to November, 2010). In this investigation, with no change in the treatment processes, the activated sludge was used to operate the system and water qualities were sampled. The water quality and energy consumption were studied before and after the adjustment of biological treatment process.
From this research it was found that 22% of electric power cost was saved using the activated sludge process. Meanwhile, in water quality, the effluents of BOD, COD, and SS are 6.1, 18.6, and 6.8 mg/L, respectively. There is no significant difference between the activated sludge treatment and A2O operations. However, in the concentrations of Total Nitrogen and Phosphorous, the average effluent concentrations are 12.68 and 1.307 mg/L, respectively. There is a slight increase in the activated sludge treatment than the A2O operation. Although the minute increases of Total N and P is extremely limited to the annual runoff of more than 8 billion cubic meters in the Kao-ping River, its long term impact upon the environment is still a concern.
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