摘要：

某化工厂在生产农药燕麦灵中间体时,排放出含盐质量浓度高达20 g/L、COD_Cr为14～16 g/L的有毒废水。采用三相蒸馏+水解酸化+缺氧+接触氧化组合工艺处理该废水的工程经过5个月的调试,出水达到工业园区排放标准。通过水解酸化后,废水的COD_Cr/BOD₅从0.12上升到0.32。工程调试过程中缺氧+接触氧化段极为关键,通过小幅度逐步的提高进水盐浓度,有效地驯化了微生物,使之适应了高浓度盐环境并提高了其活性,COD_Cr的去除率从23%上升到70%。

关键词: 含盐废水, 农药废水, 接触氧化, 水解酸化

Abstract:

A pesticide plant discharging poisonous wastewater with 20 g/L of salinity and 14-16 g/L COD_Cr when the intermediate of barban pesticide is produced. With the combining process of three phase distillation+hydrolysis acidification+anoxia+contact oxidation, the effluent water quality conforms to the discharge standard of industrial areas after five-month debugging. The ratio of COD_Cr to BOD₅ moves up to 0.32 from 0.12 when the wastewater has been hydrolyzed and acidificated. The anoxia+contact oxidation process is the key step during the whole project debugging. The microorganisms have been domesticated alive through increasing the salinity step by step and the removal rate has been increased to 70% from23% under the higher salinity circumstance of contact oxidation.

Key words: salt-containing wastewater, pesticide wastewater, contact oxidation, hydrolysis acidification

中图分类号: 

• X703.1