3种活性污泥法处理工艺的生命周期能耗分析

Analysis on Life-cycle Energy Consumption of Three Activated Sludge Processes

运用LCA方法对普通活性污泥法、AB活性污泥法和厌氧水解-活性污泥法3种处理系统从其原材料开采和加工开始直至污水厂施工建设、处理运行以及废弃拆除的LC全过程能耗进行了识别和量化分析,并进行相互比较。研究结果表明,在微孔和穿孔管2种曝气条件下与普通活性污泥法相比,厌氧水解法的LC能耗分别节省14.0％和17.6％,并且比能耗可大幅降低40.5％～43.0％。AB法的LC能耗分别节省9.5％和15.8％,但由于产泥量较大而比能耗仅与普通活性污泥法相当。

The conventional activated sludge process and two of its modifications have been evaluated using the technique of 'life-cycle analysis' to identify and quantify their energy consumption, starting from raw material extraction, through manufacture to plant construction, treatment operation and plant demolition. This enabled a comparison to be made between these process options, and the identification of opportunities for improvement of energy consumption. In this study, a comparison of the options showed that AAAS and AB process used 14.0%-17.6% and 9.5%-15.8% less LC energy than the conventional process respectively. And AAAS was found to have 40.5%-43.0% lower SEC than the conventional process, while AB process, with higher rate of sludge production, has about the same SEC as the conventional process.