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某化工厂污染场地风险评估与修复研究

发布时间:2018-02-26 10:28

  本文关键词: 化工厂 场地 风险评估 修复设计 出处:《成都理工大学》2015年硕士论文 论文类型:学位论文


【摘要】:随着城市化进程加快,产业结构调整深化,许多城市开始将主城区的工业企业迁移,产生大量存在环境风险的场地。某化工厂1987年建成,2009年停产搬迁,期间主要以生产农药产品为主,遗留的场地可能存在土壤污染。以该化工场遗留场地为研究对象,对搬迁后的场地实施土壤污染风险评估,在室内试验研究污染土壤的修复工艺,并在风险评估和室内修复工艺试验研究的基础上对污染场地进行修复工程设计,以期实现对该场地的污染修复,同时为同类污染场地的风险评估与场地修复提供借鉴意义,形成了以下主要结论或设计成果:(1)通过场地环境,对原污染场地进行危害识别,确定了主要关注目标污染物。(2)对场地健康风险评估,确定对人体健康具有风险效应的污染物有:苯、乙苯、氯苯、二甲苯(总)、1,2二氯乙烷、狄氏剂、α-六六六、β-六六六、γ-六六六、汞、镍、镉、砷、锌、铜。对以上污染物进行了人体暴露评估、毒性评估、风险表征最后得出了风险控制值。(3)确定对有机污染土壤修复采用乙醇淋洗工艺,重金属污染土壤采用固化稳定化的工艺。通过修复工艺试验研究得出:苯的土壤与乙醇平衡常数Kp=6.56;工艺试验条件为:乙醇浓度100%,淋洗次数为4次,超声时间为20min,土壤与乙醇的质量体积比为1:10,最终土壤中浓度为2.16mg/kg,去除率最高达到97.54%,结果表明采用乙醇淋洗的方法可以有效去除土壤中的有机物。重金属污染土壤采用固化稳定化方法的修复工艺条件为:水泥加入量为300%,粉煤灰加入量30%,石灰加入量为10%时固化稳定化效果最好,浸出液中重金属Cd浓度为11.4mg/L,去除率达到98.86%。(4)在对该场地有机物污染土壤的修复设计后,根据实际情况计算得出,苯污染土壤清洗3次达到修复目标值。确定修复的开挖土方量1224.78m3,湿重2118.87t,需要损耗乙醇42.38m3。对该场地重金属污染土壤的修复设计,需要修复污染土壤1177.76 m3,湿重2037.5t,经过挖掘土壤增容,需要固化的体积为重金属污染土壤有2882 m3,需要损耗水泥12469t,粉煤灰416t,石灰208t。该场地固化体处置场体积为6342.6m3,处置场宽度20m,长度158.6m,总深度为5.5m。
[Abstract]:With the acceleration of urbanization and the deepening of industrial structure adjustment, many cities began to relocate industrial enterprises in the main urban areas, resulting in a large number of sites with environmental risks. A chemical plant was completed in 1987 and stopped production and relocation in 2009. During this period, pesticide products are mainly produced, and the sites left over may have soil pollution. Taking the remaining sites of the chemical plant as the research object, the risk assessment of soil pollution will be carried out on the relocated sites. The remediation technology of contaminated soil was studied in laboratory test, and the remediation engineering design of contaminated site was carried out on the basis of risk assessment and indoor remediation process test, in order to realize the remediation of the contaminated soil. At the same time, it provides reference for the risk assessment and site restoration of the same polluted sites, and forms the following main conclusions or design results: 1) identifying the hazards of the original contaminated sites through the site environment, Identified as the main target pollutant of concern, assessment of site health risks, and identified as having a risk effect on human health the following pollutants: benzene, ethylbenzene, chlorobenzene, xylene (Dichloroethane, dieldrin, 伪-666, 尾-666, 纬-666), Mercury, nickel, cadmium, arsenic, zinc, copper. Human exposure assessment, toxicity assessment and risk characterization of the above pollutants were carried out. Finally, the risk control value was obtained. 3) Ethanol-eluting process was used for remediation of organic contaminated soil. Heavy metal contaminated soils were treated by solidification and stabilization. The results of remediation experiments showed that the equilibrium constant of benzene with ethanol was 6.56, and the experimental conditions were as follows: 100% ethanol concentration, 4 times of elution, 4 times of leaching. The ultrasonic time is 20 min, the mass volume ratio of soil to ethanol is 1: 10, the final soil concentration is 2.16 mg / kg, and the highest removal rate is 97.54%. The results show that ethanol elution can effectively remove organic matter in soil and heavy metal contaminated soil. The process conditions of curing stabilization are as follows: cement is 300, fly ash is 30, lime is 10, curing and stabilizing is the best. The concentration of CD in the leaching solution is 11.4 mg / L and the removal rate is 98.86. 4) after the remediation design of the soil contaminated by organic matter in the site, it is calculated according to the actual situation. Benzene contaminated soil was cleaned for 3 times to reach the target value of remediation. It was determined that the amount of excavated earthwork was 1224.78 m3, the wet weight was 2118.87 t, and the loss of ethanol was 42.38 m 3.The remediation design of heavy metal contaminated soil in the site required the remediation of contaminated soil 1177.76 m3, wet weight 2037.5t, and the capacity of excavated soil was increased. The volume needed to be solidified was 2882 m3 in contaminated soil, 12469t in cement, 416t in fly ash and 208t in lime. The volume of site was 6342.6m3, the width of site was 20m, the length was 158.6m, and the total depth was 5.5m.
【学位授予单位】:成都理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:X82;X78

【参考文献】

相关期刊论文 前1条

1 夏园;黄明杰;;毕节地区土法炼锌废弃场地风险评估[J];贵州农业科学;2011年08期



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