摘要
Abstract
At present,the remediation technology for high concentration ammonia nitrogen contaminated groundwater mainly adopts the in-situ ectopic disposal technology of extraction,disposal and reinjection,which was costly and not conducive to environmental goals such as carbon conservation and green remediation.In this paper,an in-situ chemical remediation and disposal technology for high concentration ammonia nitrogen contaminated groundwater was studied.Remediation agents and ratios were selected through small-scale experiments,and a pilot experiment was carried out in 1 000 m2 of the most polluted area of the chemical site.The optimal process parameters(injection well,injection flow rate,pressure and time)were determined as follows:injection volume was 1.5～2 m3,injection time was 8～15 min,and injection pressure was 0.8～1.2 Mpa.The results indicated that through in-situ injection chemical remediation and disposal technology,the ammonia nitrogen value in the groundwater of the experimental area was reduced to below the remediation target value without any tailing phenomenon.The in-situ chemical remediation and disposal technology for groundwater was more economical than the in-situ ectopic disposal technology.At the same time,this technology was not only suitable for groundwater contaminated with ammonia nitrogen,but also for groundwater polluted by heavy metals and organic matter.关键词
氨氮污染/原位注射/地下水/化工场地/原位修复Key words
ammonia nitrogen/in-situ injection/ground water/chemical oxidation/chemical industry site/in situ repair分类
资源环境
