The effects of the return sludge ratio and the return mixed liquid ratio on the removal of nitrogen and phosphorus were studied in the modified A2/O process.
重点介绍了坂雪岗污水处理厂的复合改良A2/O工艺的运行方式及除磷效果，并分析了实际运行中存在的问题及工程设计时的注意事项。
The key reasons of lowing of cleaned ratio coal were bad coal quality and large increase in sludge.
经分析发现，煤质变差，煤泥量大幅度增加是影响精煤产率的关键。
Test results showed that OBC of sludge suspensions was decreased slightly with the solid-liquid ratio of the suspensions, but increased with the anaerobic incubation time.
实验结果表明，污泥悬液的氧化缓冲容量随着悬液固液比的增大略有减小，随着悬液厌氧培养时间的延长而增加。
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