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Research on evaluation and optimization of soil and groundwater remediation technology

土壤与地下水修复技术评价与优化研究

基本信息

批准号：
11555135
负责人：
HIRATA Mtatemasa
金额：
$ 3.71万
依托单位：
Wakayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555135/
关键词：
soil and groundwater contamination volatile organic compounds nitrate nitrogen groundwater extraction soil vapor extraction in situ air sparging reduction in fertilizer application reactive barrier 硝酸性および亜硝酸性窒素エアースパージング汚染修復技術原位置対策

项目摘要

When soil and groundwater remediation is carried out in the contaminated site, the rate of removal of contaminants falls with progress of time. Therefore, using single remediation technology, the effect of removal does not go up although cost increases. In order to clean up the contaminated soil and groundwater efficiently, it is necessary to select and combine the suitable technologies. For that purpose, it is important to understand the migration of contaminants in subsurface. The purpose of this research is to clarify the procedure to clean up the contaminated soil and groundwater efficiently and economically based on the characteristics of migration of contaminants in subsurface. It focuses on volatile organic compounds and nitrate nitrogen as contaminants this time.In 1999 and 2000, we classified and arranged the existing soil and groundwater remediation technologies and evaluated the in situ air sparging through the field trial. In situ air sparging attracts attention as technology which cleans up soil and groundwater contaminated with the volatile organic compounds. In addition, we investigated the groundwater contamination with nitrate nitrogen near tea plantation area. In 2001, the optimal employment method of in situ air sparging was examined based on the field trial and laboratory experiment. On the other hand, it was cleared that the reduction in fertilizer application had great influenced on the decrease of the concentration of nitrate nitrogen in groundwater and the reactive barrier is effective to decompose and remove the nitrate nitrogen in groundwater. As a result, the reactive barrier coupled with the reduction of fertilizer application is the most effective remediation technology for groundwater contamination with nitrate nitrogen at present.

当在污染场地进行土壤和地下水修复时，污染物的去除率福尔斯随着时间的推移而下降。因此，采用单一的修复技术，虽然成本增加，但去除效果并没有提高。为了有效地净化受污染的土壤和地下水，必须选择和联合收割机组合合适的技术。为此，重要的是要了解地下污染物的迁移。本研究的目的是根据污染物在地下水中的迁移特性，阐明污染土壤和地下水的高效、经济的净化程序。1999年和2000年，我们对现有的土壤和地下水修复技术进行了分类整理，并通过现场试验对原位曝气技术进行了评价。原位空气喷射技术作为一种治理土壤和地下水中挥发性有机物污染的技术受到了人们的关注。此外，还调查了种植园附近地下水硝态氮的污染状况。2001年，在现场试验和室内试验的基础上，研究了原位空气喷射的最佳使用方法。另一方面，化肥施用量的减少对地下水中硝态氮浓度的降低有较大影响，反应墙对地下水中硝态氮的分解和去除是有效的。因此，反应墙与化肥减量相结合是目前地下水硝酸盐氮污染最有效的修复技术。