1,1,1-三氯乙烷和1,4-二噁烷复合污染地下水的超声协同降解研究

李炳智; 朱江

文章摘要

李炳智,朱江.1,1,1-三氯乙烷和1,4-二噁烷复合污染地下水的超声协同降解研究[J].农业环境科学学报,2015,34(11):2183-2189.

1,1,1-三氯乙烷和1,4-二噁烷复合污染地下水的超声协同降解研究

Degradation of 1,1,1-Trichloroethane and 1,4-Dioxane Co-existed in Groundwater by Ultrasonics-Oxidant Systems

投稿时间：2015-05-25

DOI：10.11654/jaes.2015.11.021

中文关键词: 1,1,1-三氯乙烷 1,4-二噁烷地下水污染超声协同降解

英文关键词: 1,1,1-trichloroethane 1,4-dioxane groundwater contamination ultrasonics joint degradation

基金项目:国家自然科学基金(41303095);上海市自然科学基金(13ＺR1435200,12ＺR1426500);上海市人才发展资金(201320);上海市环保局重大科研项目(沪环科2014-07);上海市环保局青年基金(H214305);上海市环科院青创基金(CX201304)

作者	单位	E-mail
李炳智	上海市环境科学研究院, 上海 200233
朱江	上海市环境科学研究院, 上海 200233	jzh@sjtu.edu.cn

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中文摘要:

以某场地1,1,1-三氯乙烷(TCA)和1,4-二噁烷(1,4-D)复合污染地下水为研究对象,探讨了超声(US)与氧化剂[S₂O₈^2-(PS)和H₂O₂]协同降解目标污染物的效能、影响因素和急性毒性抑制效应.结果表明,室温25 ℃、初始ｐH8.2、氧化剂/1,4-D摩尔比200:1、超声频率400 ｋHz、强度2.67 Ｗ·cm^-2、功率100 Ｗ时,复合污染地下水经4种体系处理4 ｈ,其中"US+PS+H₂O₂"耦合体系的降解效果最佳,TCA可完全去除,1,4-D去除率为33％.基于两种污染物的去除效果,PS、H₂O₂投量和反应温度对耦合体系污染物去除影响较大,较佳氧化剂投量为:PS、H₂O₂与1,4-D摩尔比分别为1000:1和200:1.按该投量且控温时TCA和1,4-D分别经6 ｈ和10 ｈ后完全去除,其急性毒性抑制效应分别降低98.81%和99.87%;非恒温时温度逐渐增至60 ℃,目标污染物去除速度明显加快,相比恒温时耗时分别缩短1 ｈ和3 h.试验证明,超声协同降解工艺是一种有应用前景的修复TCA和1,4-D复合污染地下水的有效方法.

英文摘要:

In China there is little information available about the degradation of 1,1,1-trichloroethane(TCA) and 1,4-dioxane(1,4-D) in groundwater. Here the efficiencies, influencing factors and acute toxicity effects of TCS and 1,4-D degradation in ultrasonics(US) and/or oxidants[persulfate(PS) and H₂O₂] systems were examined. Results showed that the "US+PS+H₂O₂" system exhibited the best treatment performance, in which 100% of TCA and 33% of 1,4-D were degraded within 4 h at 25 ℃, initial pH of 8.2, oxidant/1,4-D molar ratio of 200:1, ultrasonic frequency of 400 kHz, ultrasonic intensity of 2.67 W·cm^-2 and power of 100 W. Oxidants(PS and H₂O₂) and reaction temperature had important impacts on the removal of TCA and 1,4-D. The optimum oxidant doses were:H₂O₂/1,4-D=200:1, and PS/1,4-D=1000:1. At a constant temperature of 25 ℃, TCA and 1,4-D were completely removed after 6 h and 10 h, and the acute toxicities of treated groundwater were decreased by 98.81% and 99.87%, respectively. Rising temperature gradually to 60 ℃ enhanced the degradation rates of target pollutants, and shortened degradation time by 1 h and 3 h, respectively. These results show that ultrasonics plus oxidants is a promising method for remediating concurrently contaminated groundwater with TCA and 1,4-D.

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