摘要
通过在实验室模拟不同的环境条件,研究常用有机氯化合物——六氯乙烷(Hexachloroethane,HcE)在好氧和厌氧环境条件中的土壤生物降解动态及其影响因素。结果表明,HCE在水稻土中的降解遵循一级反应动力学方程。相对于好氧条件,厌氧条件下土壤微生物对HCE的降解影响较大。在厌氧条件下,在30-60mg/kg的浓度范围内,HCE的降解随土壤中HCE起始浓度增加而加快,当浓度≥60mg/kg时,随HCE起始浓度增加而减慢。而在好氧条件下,HCE的降解速率变化较小,表明相对于好氧条件,厌氧条件下土壤微生物可以利用HCE生长,在未达到其毒性耐受浓度时,HCE降解速率随着其浓度的增加而提高,但当浓度超过微生物的耐受极限浓度时,微生物活动将受到抑制,HCE的降解速率呈下降趋势。
Lab-scale experiments were conducted to simulate degradation of hexachloroethane (HCE) in soil under aerobic and anaerobic conditions. The results showed that degradation of HCE in soil followed the first-order kinetic equation, and under anaerobic condition, compared with aerobic condition, the presence of microorganisms mainly affected the degradation. It was concluded that microorganisms under anaerobic condition were able to grow fast by degrading HCE, and thus degradation of HCE accelerated with the increased initia/HCE concentrations; however, the degradation rate would decline when the initial concentration of HCE reached the maximum tolerable dose.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第2期70-74,85,共6页
Environmental Science & Technology
基金
国家自然科学基金青年科学基金项目(21107023)
中国博士后科学基金资助项目(20110491001)
浙江省自然科学基金项目(Y307025)
河南省教育厅自然科学基金项目(2010B610007)
关键词
土壤
六氯乙烷
降解
soil
hexachloroethane(HCE)
degradation