Abstract:

The main problemof the biological treatment of coal gasification wastewater is that it is not effective in removing the refractory organics and NH₃, and has lowrunning stability. Aerobic(O) anoxic(A) aerobic(O) biological process is put forward for the wastewater second treatment. The experiment shows that the newsystemcan still be operated stably when the COD and total phenols concentrations of the influent are as high as 2 066.6 mg/L and 406.9mg/L respectively. The COD and total phenols removal rates are more than 87.5% and 88.6% respectively. The totalammonia removal rate is 67.2%. The COD and phenols are mainly removed in the first aerobic unit. Its monohydricphenol removal rate is 85.3% and the total NH₃ removal rate is about 35.9% in this unit. The total phenol and ammonia are removed to a certain extent in the anoxic unit. NH₃ removal rate is 40.1% in the second aerobic unit. The process shows superiority in the treatment of coal gasification wastewater.

Key words: coal gasification wastewater, aerobic, anoxic, bio-treatment

摘要：

煤气废水生物处理存在的主要问题是系统运行稳定性差、难降解有机物和氨氮去除率低。采用新开发的好氧-缺氧-好氧生物工艺对该类废水进行了现场处理试验。结果表明，系统在入水COD和总酚质量浓度分别为2066.6、406.9mg/L的条件下仍可以稳定运行，去除率分别为87.5%和88.6%，系统对总氨去除率为67.2%;一级好氧单元是酚类物质及COD的主要去除单元，对一元酚的去除率达99.5%，对多元酚去除率为85.3%，另外对氨氮也有35.9%的去除;缺氧单元对总酚和氨均有一定的去除效果;二级好氧单元氨去除率为40.1%。表明该工艺在处理实际煤气废水上具有一定的优越性。

关键词: 煤气废水, 好氧, 缺氧, 生物处理

CLC Number: 

• X703.1