%0 Journal Article
%T 蒸汽强化气相抽提修复苯系物污染粘性土壤</br>Research upon Steam Enhanced Vapor Extraction for the Remediation of Benzene Homologues Contaminated Clayed Soil
%A 李炳智
%A 朱江
%A 吉敏
%A 涂宝声
%A 林小小
%J 上海交通大学学报农业科学版
%D 2016
%X 蒸汽强化土壤气相抽提是近期发展并具良好应用前景的土壤污染修复技术。研究以6种挥发性苯系物(BTEX)为目标污染物,考察了抽气速率、搅拌速率、土壤温度、蒸汽加热功率等对土壤污染物去除的影响及抽提过程特征。结果表明,调质药剂(0～40%)、搅拌速率(60～300 r/min)、土壤温度(60～150 ℃)和加热功率(100～400 W)对污染物的去除影响较大,而抽气速率(3.0～15.0 L/min)影响较小。较佳的工艺条件为:抽气速率6.0 L/min、调质药剂40%、搅拌速率300 r/min、土壤温度100 ℃和加热功率200 W。此条件下土壤气相苯系物浓度遵从一级衰减动力学模型,其速率常数与污染物沸点呈负相关;伴随冷凝水中污染物浓度逐渐下降,6 d后土壤有机质含量从初始6.998%下降至2.741%,污染物整体去除率均超90%。研究表明,该技术是BTEX污染粘性土壤的一种快速、有效的修复方法。</br>Steam Enhanced Soil Vapor Extraction (SVE)was employed to evaluate the effects of pumping rate,stirring rate,soil temperature and steam heating power on removal of six volatile Benzene,Toluene,Ethylbenzene,and Xylenes (BTEX)in soil.The results showed that the removal of the pollutants was impacted more by dosage of conditioning agent (0-40%),stirring rate (60-300 r/min),soil temp.(60-150 ℃)and steam heating power (100-400 W),and less by pumping rate (3.0-15.0 L/min).The better operating conditions were:pumping rate 6.0 L/min,dosage of conditioning agent 40%,stirring rate 300 r/min,soil temperature 100 ℃ and steam heating power 200 W.Under these conditions,the removal of gaseous pollutants was fitted with first-order decay kinetic model,and the rate constant was found to increase with decreasing boiling point of the pollutant.Meanwhile,the concentrations of the pollutants in condensate water correspondingly declined.After 6 d,the content of organic matter in soil was decreased from initial 6.998% to 2.741%,the total removal efficiencies of benzene homologues exceeded 90%.The results indicate that this technology is an effective and rapid remediation method for contaminated clayed soil with BTEX.
%K 蒸汽强化 气相抽提(SVE) 苯系物(BTEX) 粘性土壤&lt
%K /br&gt
%K steam enhanced soil vapor extraction BTEX clayed soil
%U http://shjtdxnxb.cnjournals.com/ch/reader/view_abstract.aspx?file_no=20160509&flag=1