Abstract:

The combined process,ozonation-hydrolysis acidification-IRBAF,has been used for the advanced treatment of secondary biochemical effluent in a fuel ethanol plant. The influences of ozonation time,ozone adding speed, and biochemical treatment unit HRT on the removing rates of COD,NH₃-N and chroma of the wastewater are investigated. The results show that when the influent COD is 230-270 mg/L,NH₃-N 9.7-10.9 mg/L,and chroma 80-124 times,under the following conditions:ozonation time is 30 min,ozone adding speed 1.40 g/h,HRT in both hydrolysis acidification pool and IRBAF reactor are 4 h,the effluent COD and NH₃-N are 45.9 mg/L and 3.13 mg/L, respectively,and chroma less than 4 times,meeting the requirements for the first level discharge standard specified in the Integrated Wastewater Discharge Standard(GB 8978-1996).

Key words: fuel ethanol wastewater, ozonation, hydrolysis acidification, IRBAF, advanced treatment

摘要：

采用臭氧-水解酸化-内循环BAF组合工艺深度处理燃料乙醇企业二级生化出水，考察了臭氧氧化时间、臭氧投加速率、生化处理单元HRT对废水COD、NH₃-N、色度去除率的影响。结果表明：当进水COD为230~270 mg/L，NH₃-N为9.7~10.9 mg/L，色度为80~124倍时，在臭氧氧化时间为30 min，臭氧投加速率为1.40 g/h，水解酸化池和内循环BAF反应器HRT均为4 h的条件下，出水COD、NH₃-N分别为45.9、3.13 mg/L，色度<4倍，达到了《污水综合排放标准》（GB 8978-1996）一级排放标准的要求。

关键词: 燃料乙醇废水, 臭氧氧化, 水解酸化, 内循环BAF, 深度处理

CLC Number: 

• X703.1