循环活性污泥法处理丙烯腈废水

Treatment of Acrylonitrile Wastewater by Cyclic Activated Sludge Process

采用循环活性污泥法处理模拟丙烯腈废水,探讨了丙烯腈的微生物降解机理。实验结果表明:在进水1 h、厌氧1 h、曝气4 h、沉淀1 h的处理条件下,处理后丙烯腈质量浓度由71 mg/L降至4.4 mg/L,去除率为93.8%;COD由546 mg/L降至49 mg/L,去除率为91%。用扫描电子显微镜观察反应器中的活性污泥,发现八叠球菌、诺卡氏菌、链球菌为其主要菌群。

Simulated acrylonitrile wastewater was treated by cyclic activated sludge process and the mechanism of acrylonitrile biodegradation was discussed. The experimental results show that after water - feeding for 1 h, anaerobic treatment for 1 h, aeration for 4 h and precipitation for 1 h, the mass concentration of acrylonitrile and COD were reduced from 71 mg/L to 4.4 mg/L and from 546 mg/L to 49 mg/L respectively. The removal rates of acrylonitrile and COD were 93. 8% and 91% respectively. Bacteria of Sarcina sp., Nocardia sp. and Streptococcus sp. are found as main flora by observing activated sludge in the reactor with scanning electron microscope.