Biodegradation behavior of perchlorate pollutants in natural purification
1.School of Environment, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Schcool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China; 3.Yangzhou Vocational College of Environment and Resources, Yangzhou, Jiangsu 225002, China)
Abstract：The perchlorate (ClO-4) degradation behavior in natural purification was investigated. The influences of nitrate, sulfate and organic substrate on the ClO-4degradation were discussed. It was found that the lag times of both ClO-4and NO-3degradation were sitespecific and depended on the environmental conditions such as content of organic substrate, nitrate concentration, initial ClO-4concentration and prior ClO-4exposure. The lag time of ClO-4degradation at an initial concentration of 5 mg／L ranges from 15 to 34 days, and its rate constant ranges from 0003～0094 d-1. While the lag time of NO-3degradation ranges from 05 to 16.0 days, its rate constant ranges from 0017～0179 d-1. The experiment results show that the ClO-4degradation efficiency has positive correlation to the availability of organic substrate, and nitrate does inhibit ClO-4degradation, especially when ClO-4is at μg／L levels in the environment compared to mg／L levels of NO-3, and microorganism can degrade ClO-4 in the environment.
2010, Vol. 31 
