废弃铁合金厂土壤重金属污染修复效果评估  

Evaluation of Soil Pollution Remediation Effect of an AbandonedFerroalloy Factory in Hunan Province

作　　者：刘宇娟 陈建华[1] 陈姣 周建良 彭宗良 Liu Yujuan;Chen Jianhua;Chen Jiao;Zhou Jianliang;Peng Zongliang(Central South University of Forestry and Technology,Changsha,Hunan 410004,China;Hunan Yijia Construction Supervision Co.,Ltd.,Changsha,Hunan 410004,China;Hunan Heqing Environmental Technology Co.,Ltd.,Xiangtan,Hunan 411400,China)

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]湖南省益佳建设监理有限公司,湖南长沙410004 [3]湖南省和清环境科技有限公司,湖南湘潭411400

出　　处：《绿色科技》2022年第4期4-9,共6页Journal of Green Science and Technology

基　　金：国家林业局林业公益性行业科研专项(编号:201104052)。

摘　　要：由于重金属污染是威胁人类生存的重要隐患,通过研究湖南某废弃铁合金厂的重金属污染土壤,探究了多种重金属修复方法的应用的可行性。前期对土壤中镉、铬、铅、锰、锌、汞等10种重金属进行了检测,发现铬的含量最高,超标率达到了69.2%,其次为锰、锌。为修复污染区域,针对上层污染土壤(0~50 cm)物理性治理清挖转运填埋,上层污染土壤(0~50 cm)综合运用外借清洁客土阻隔回填法。下层污染土壤轻度采用化学稳定化固定技术,治理后原位回填。治理完成后采用逐个比对法进行了土壤修复效果评估。结果表明:此次修复了占地约100亩的土壤重金属污染区域,检测结果显示,修复后第一次采集的土壤样品中,有17个超标,土壤样品超过了限值,超标污染物均为六价铬;第二次清挖补充检测仍有5个点位六价铬超标;第三次对场地曾检出超标的网格继续进行采样检测,显示上述网格底坑和侧壁土壤样品污染物均满足限值。故此次评估认为:该场地修复区域污染土壤清挖效果和修复后的场地均满足实施方案的要求,场地的修复工作达到了修复工业用地标准目标,由于上层污染土壤的清除,因此,对该区域地下水轻度污染直接达到地下水Ⅲ类标准,从而满足工业用地规范要求。At present,heavy metal pollution is an important hidden danger that threatens the survival of mankind.In response to heavy metal pollution,various repair methods have been tried to return a piece of pure land to mankind.In this paper,by studying the heavy metal contaminated soil of an abandoned ferroalloy factory in Hunan Province,it explored whether the application of multiple heavy metal remediation methods is effective.In the early stage,ten heavy metals including cadmium,chromium,lead,manganese,zinc,and mercury were detected in the soil,and it was found that the content of chromium was the highest,with an exceeding rate of 69.2%,followed by manganese and zinc.In order to repair the contaminated area,the upper layer of contaminated soil(0~50㎝)is physically cleaned,excavated and transferred to landfill,and the upper layer of contaminated soil(0~50㎝)is comprehensively used to block and refill the borrowed clean guest soil.The lower contaminated soil is slightly chemically stabilized and fixed,and backfilled in situ after treatment.After the treatment is completed,the effect of soil remediation is evaluated by the comparison method one by one.This time,an area of about 100 acres of soil contaminated by heavy metals was rehabilitated.The test results showed that 17 of the soil samples collected for the first time after the restoration exceeded the standard;the soil samples exceeded the limit,and the excessive pollutants were all hexavalent chromium.The second time of excavation supplementary inspection still has 5 points where hexavalent chromium exceeds the standard;the third time,the grid that has been detected to exceed the standard continues to be sampled and tested,and finally the above-mentioned grid bottom pit and side wall soil sample contaminants are displayed and all meet the limit.This assessment believes that the removal effect of contaminated soil in the remediation area of the site and the remediation of the site meet the requirements of the implementation plan.The remediation of the site has rea

关 键 词：铁合金厂 重金属 土壤污染 修复实践 修复技术 效果评估 

分 类 号：X83[环境科学与工程—环境工程]