UASB处理低浓度城市污水的生产性研究

Productive Study on UASB Process for Low-strength Municipal Sewage Treatment

广东某城市污水处理厂采用UASB-好氧工艺处理低浓度城市污水，对UASB的实际处理效能进行了考察。结果表明，在试验的进水水质条件下，当UASB的水力停留时间为6h时，系统对COD和BOD5的平均去除率分别为50％和60％，对TP的去除率为15％～38％。当HRT由5．67h延长至10h时，出水VFA浓度会随之降低，而pH值则始终稳定在6．5～7．5，系统对COD和BOD5的去除率分别增加9％和19％，对溶解性COD和BOD5的去除率分别增加25％和24％。

The actual operation performance of upflow anaerobic sludge blanket （UASB） reactor coupled with an aerobic process for treating low-strength municipal sewage was investigated in a Guangdong municipal sewage treatment plant. The results indicate that under HRT of 6 h in UASB reactor, the average removal rates of COD, BOD5 , and TP in the system are 50%, 60% and 15% to 38%, respectively. When the HRT extends from 5.67 to 10 h, the effluent VFA concentration declines, pH value steadies at 6.5 to 7.5, the average removal rates of COD, BOD5, dissolved COD and BOD5 are increased by 9%, 19%, 25% and 24% respectively.