焦化废水处理厂活性污泥对硫氰化物的降解机制  

Biodegradation mechanism of thiocyanate by activated sludge from coking wastewater treatment plant

作　　者：张玉秀[1] 尹莉[1,2] 李海波[2] 蒙小俊[1] 盛宇星[2] 曹宏斌[2] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院环境与生物工程系,北京100083 [2]中国科学院过程工程研究所过程污染控制环境工程研究中心,北京100190

出　　处：《环境化学》2016年第1期118-124,共7页Environmental Chemistry

基　　金：国家自然科学基金(31370281);国家环境公益项目(201509053);国家大学生创新训练项目(C201503043);中央高校基本科研业务费专项基金(2010YH05)资助~~

摘　　要：用分光光度法和离子色谱法,研究了A/A/O工艺焦化废水处理厂的进出水质和活性污泥对硫氰化物(SCN-)的降解机制.研究结果表明,SCN-主要在A/A/O工艺的好氧单元中降解去除;在常温(25℃)下活性污泥对SCN-降解的动力学过程符合米氏方程,Vmax为11.15 mg SCN-·(g-1MLSS)·h-1,Km为44.96 mg·L-1;15℃低温显著降低SCN-的降解速率;在15℃下,92.62 mg·L-1SCN-能在24 h内完全降解,其中的N和S元素相应地生成了NH3、NO-2和S2-等中间代谢产物,并最终转化为产物NO-3和SO2-4;N和S元素的转化率分别为94.32%和99.08%,基本符合物料守恒定律,说明SCN-中N和S元素在好氧池中可以彻底降解转化NO-3和SO2-4.这些结果对于了解好氧池的功能和提高焦化废水中的SCN-去除率具有重要意义.The influent and effluent qualities of A / A / O in coking wastewater biological treatment system and degradation mechanism of thiocyanate（ SCN-） by aerobic sludge were studied using the spectrophotometry and ion chromatography. The results showed that SCN-was mainly removed in the aerobic unit of A / A / O process. The degradation kinetics of SCN-in the activated sludge followed the Michaelis-Menten equation at room temperature（ 25 ℃）,and the kinetic parameters Vm axand Km were 11.15 mg SCN-·（ g-1MLSS）·h-1and 44.96 mg·L-1,respectively. The degradation rate of SCNwas reduced significantly at 15 ℃. SCN-of 92.62 mg·L-1was degraded completely within 24 h at15 ℃. Intermediate products of NH3-N,NO-2and S2-were produced with SCN-degradation,and were ultimately transformed to NO-3and SO2-4,respectively. The transformation rates of N and Selement were 94.32% and 99.08%,respectively,which were in line with the law of mass balance,indicating N and S elements of SCN-could be completely transformed to NO-3and SO2-4in the aerobic tank. These results provide useful information for understanding the function of aerobic tank and improving removal of SCN-in coking wastewater.

关 键 词：硫氰化物 活性污泥 生物降解 焦化废水. 

分 类 号：X784[环境科学与工程—环境工程]