生物法降解EDTA废水及其脱氮特性的研究  

Treatment of EDTA-containing wastewater by biodegradation and nitrogen removal characteristics thereof

作　　者：王瑞敏[1] 黄少斌[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006

出　　处：《工业用水与废水》2009年第6期31-34,共4页Industrial Water & Wastewater

基　　金：国家自然科学基金项目(20777019)

摘　　要：采用好氧反硝化菌群体系,通过改变共基质及pH值,在好氧条件下研究乙二胺四乙酸(EDTA)的生物降解特性,以及在EDTA存在条件下该体系的脱氮性能。试验结果表明,该菌群能够具有同时反硝化和降解EDTA的作用;单基质条件下EDTA难以生物降解,共基质可以促进EDTA的降解。其中,乙酸钠作为共基质经过7dEDTA降解83.24%,同时具有很好的反硝化效果;以葡萄糖作为共基质7dEDTA降解68%,但存在亚硝酸盐累积现象。酸性条件下对EDTA的生物降解有抑制作用,中性至碱性条件下EDTA降解效果较好,在pH值为7～9范围内,pH值对EDTA生物降解影响作用不大。In the system of aerobic denitrification bacterial flora, the biodegradation characteristics of EDTA under aerobic condition was studied through changing co-substrate and pH value; besides, the nitrogen removal performance of the said system with existence of EDTA was investigated. The results of the test showed that; aerobic denitrification bacterial flora has denitrifieation performance and effect on EDTA degradation; EDTA was hard to be biodegraded under single substrate condition, however, the degradation could be improved with co-substrate. With sodium acetate as eo-substrate, the removal rate of EDTA was 83.24% after 7 days, and a good denitrifieation effect was obtained at the same time. The removal rate of EDTA with glucose as co-substrate was 68% after 7 days and an obvious accumulation of nitrite was observed. It was indicated that, acidic condition had an inhibitive effect on EDTA biodegradation, the biodegradation effect was good under neutral and alkaline conditions, and the pH value has little influence on biodegradation when it was in range of 7 - 9.

关 键 词：EDTA 生物降解 反硝化 共基质 

分 类 号：X703.1[环境科学与工程—环境工程]