A three-step activated sludge process system of degreasing-dephenolizing-stripping ammonia is now being adopted to treat the wastewater produced by Hayi Coal Gasification Plant.

• 哈依煤气厂现采用废水处理工艺为除油-脱酚-蒸氨-三段生物活性污泥处理系统,存在的主要问题有:预处理不稳;