| 原位生物稳定固化技术在铬污染场地治理中的应用研究 |
| 摘要点击 4392 全文点击 1986 投稿时间：2012-08-07 修订日期：2012-11-10 |
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| 中文关键词 铬 污染场地 原位 修复 生物稳定固化 |
| 英文关键词 chromium contaminated site in-situ remediation biological stabilization solidification (SS) technology |
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| 中文摘要 |
| 原位生物稳定固化方法是控制铬污染场地地下水风险的有效方法,通过实地工程试验,初步验证了原位生物稳定固化法治理南方某铬污染场地的修复效果. 实地工程试验的场地面积约600 m2,位于整个污染场地的上游,受高浓度铬污染,总铬含量高值为11850 mg ·kg-1, 六价铬含量高值为349 mg ·kg-1,污染最为严重的土层为-0.5~-2 m. 通过对在试验场地范围内设置注射井注射还原剂和微生物调节剂等,并通过监测井监测分析不同时间不同深度范围内在药剂注射的作用下地下水中六价铬和总铬的浓度变化. 工程试验结果表明,原位生物稳定固化技术显著改变了土壤中铬的形态,进而降低了铬的迁移性,消减了地下水污染风险. 注入的药剂对注入井(有效范围)内的地下水六铬污染治理效果很好,六价铬转成三价铬并固定稳定率达到94%~99.9%,总铬固定稳定率达到83.9%~99.8%. 试验结果对于浅层地下水深度较浅、土壤以粉质黏土和砂质黏土为主的污染场地修复具有重要的参考价值. |
| 英文摘要 |
| In-situ biological stabilization solidification (SS) technology is an effective ground water risk control method for chromium contaminated sites. Through on-site engineering test, this paper has preliminarily validated the remediation effect of in-situ SS method on a southern chromium contaminated site. The engineering test site has an area of approximately 600 m2, and is located at the upstream of the contaminated area. Due to the severe contamination of chromium, the total chromium concentration reached up to 11850 mg ·kg-1, while the hexavalent chromium concentration reached up to 349 mg ·kg-1, and the most severely contaminated soil had a depth of -0.5—2 m. Variations in hexavalent chromium and total chromium concentration in groundwater were observed through the injection of reducing agents and microbial regulators into the injection wells in the test site, and through the monitoring analysis at different time and different depth under the action of the injection agents. Results of the engineering test showed that the on-site SS technology significantly changed the chromium speciation in soil and then reduced the migration of chromium, thus the groundwater risk was reduced. The injected agents had a good effect of hexavalent chromium remediation in groundwater within the effective range of the injection wells, and the SS rate of hexavalent chromium into trivalent chromium reached 94%-99.9%, the SS rate of total chromium fixation reached 83.9%-99.8%. The test results are of significant reference value for the remediation of contaminated sites with features of shallow groundwater depth and soil mainly consisting of silty clay and sandy clay. |
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