摘要
为探究化学氧化、化学淋洗及热脱附技术对有机氯农药污染场地的修复效果,选取六氯苯污染土壤为研究对象,分别考察三种修复技术及联合修复技术,并按照GB36600-2018《土壤环境质量建设用地土壤污染风险管控标准(试行)》评估修复效果。结果表明,化学氧化和化学淋洗修复技术均可以实现低浓度污染土壤(25~36.4 mg/kg)中六氯苯的含量低于建设用地二类用地管制值10 mg/kg;热脱附温度150℃,停留时间60 min时可以实现高浓度污染土壤(67 mg/kg)中六氯苯的含量低于一类建设用地的管制值标准3.3 mg/kg;联合修复技术较单一修复技术可以大大提高土壤中六氯苯的去除效果,其中化学氧化联合热脱附修复后六氯苯含量低于二类用地的筛选值1 mg/kg。由此可见,联合修复技术修复六氯苯污染土壤是可行的,具有一定的研究应用价值。
In order to explore the remediation effects of chemical oxidation,chemical leaching,and thermal desorption technologies on organochlorine pesticide contaminated sites,hexachlorobenzene was chosen as the target contaminant,and three remediation technologies and combined remediation technologies were investigated.The remediation effects were evaluated in accordance with GB36600-2018 Soil Environmental Quality,Soil Pollution Risk Control Standards for Construction Land(Trial).The results showed that both chemical oxidation and chemical leaching remediation techniques could achieve a lower content of hexachlorobenzene in low concentration polluted soil(25 mg/kg to 36.4 mg/kg)than the regulated value of 10 mg/kg for Class II construction land;When the thermal desorption temperature is 150℃,and the residence time is 60 min,the content of hexachlorobenzene in highly polluted soil(67 mg/kg)can be lower than the regulated value standard of 3.3 mg/kg for Class I construction land;The combined remediation technology can significantly improve the removal efficiency of hexachlorobenzene from soil compared to a single remediation technology.Chemical oxidation combined with thermal desorption for remediation of highly contaminated soil(66.7 mg/kg)makes the content of hexachlorobenzene lower than the screening value of 1 mg/kg for Class II land.It can be seen that the combined remediation technology for remediation of hexachlorobenzene contaminated soil is feasible and has certain research and application value.
作者
张海静
肖武
肖劲光
刘德华
刘喜
Zhang Haijing;Xiao Wu;Xiao Jinguang;Liu Dehua;Liu Xi(Power China Environmental Engineering Co.,Ltd.,Changsha 410013,China;Power China Zhongnan Engineering Corporation Limited,Changsha 410014,China)
出处
《环保科技》
2023年第6期12-18,共7页
Environmental Protection and Technology
基金
湖南省生态环境厅科研项目《基于TCE和1,4二恶烷的有机污染场地可持续CRMS-PRB原位修复技术研究》(HBKT-2021008)。
关键词
六氯苯
有机氯农药
化学氧化
化学淋洗
热脱附技术
联合修复技术
hexachlorobenzene
organochlorine pesticides
chemical oxidation
chemical leaching
thermal desorption
combined remediation technology
