文献类型：期刊文献

英文题名：Inhibitory effect of cyanide on nitrification process and its eliminating method in a suspended activated sludge process

作者：Han, Yuanyuan[1];Jin, Xibiao[1];Wang, Yuan[1];Liu, Yongdi[1];Chen, Xiurong[1]

机构：[1]E China Univ Sci & Technol, Res Inst Environm Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：21

期号：4

起止页码：2706

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20242716641202);WOS:【SCI-EXPANDED(收录号:WOS:000331815100028)】；

基金：This research was supported by National Natural Science Foundation of China (No. 51008124) and the National Key Technologies Research and Development Program of China (No. 2008BAE64B06).

语种：英文

外文关键词：Cyanide; Ammonia; Nitrification; Inhibition; Cyanide-degrading bacteria; Acrylonitrile

摘要：Inhibition of nitrification by four typical pollutants (acrylonitrile, acrylic acid, acetonitrile and cyanide) in acrylonitrile wastewater was investigated. The inhibitory effect of cyanide on nitrification was strongest, with a 50% inhibitory concentration of 0.218 mg.gVSS(-1) being observed in a municipal activated sludge system. However, the performance of nitrification was recovered when cyanide was completely degraded. The nitrification, which had been inhibited by 4.17 mg.gVSS(-1) of free cyanide for 24 h, was recovered to greater than 95% of that without cyanide after 10 days of recovery. To overcome cyanide inhibition, cyanide-degrading bacteria were cultivated in a batch reactor by increasing the influent cyanide concentration in a stepwise manner, which resulted in an increase in the average cyanide degradation rate from 0.14 to 1.01 mg CN-.gVSS(-1).h(-1) over 20 days. The cultured cyanide-degrading bacteria were shaped like short rods, and the dominant cyanide-degrading bacteria strain was identified as Pseudomonas fluorescens NCIMB by PCR.