In Situ Persulfate Oxidation of 1,2,3-Trichloropropane in Groundwater of North China Plain
| Autor: | Han Zhantao, Kong Xiangke, Li Hui, Ping Wang, Yong Qian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
China
Environmental remediation Health Toxicology and Mutagenesis 0208 environmental biotechnology lcsh:Medicine 02 engineering and technology BTEX 010501 environmental sciences 01 natural sciences Ethylbenzene Article chemistry.chemical_compound Propane 1 2 3-trichloropropane groundwater Hydrocarbons Chlorinated persulfate Benzene Environmental Restoration and Remediation 0105 earth and related environmental sciences chemistry.chemical_classification Chemistry Sulfates lcsh:R Xylene Public Health Environmental and Occupational Health Persulfate Toluene 020801 environmental engineering injection technology Hydrocarbon Environmental chemistry in situ oxidation Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | International Journal of Environmental Research and Public Health International Journal of Environmental Research and Public Health, Vol 16, Iss 15, p 2752 (2019) Volume 16 Issue 15 |
| ISSN: | 1660-4601 1661-7827 |
| Popis: | In situ injection of Fe(II)-activated persulfate was carried out to oxidize chlorinated hydrocarbons and benzene, toluene, ethylbenzene, and xylene (BTEX) in groundwater in a contaminated site in North China Plain. To confirm the degradation of contaminants, an oxidant mixture of persulfate, ferrous sulfate, and citric acid was mixed with the main contaminants including 1,2,3-trichloropropane (TCP) and benzene before field demonstration. Then the mixed oxidant solution of 6 m3 was injected into an aquifer with two different depths of 8 and 15 m to oxidize a high concentration of TCP, other kinds of chlorinated hydrocarbons, and BTEX. In laboratory tests, the removal efficiency of TCP reached 61.4% in 24 h without other contaminants but the removal rate was decreased by the presence of benzene. Organic matter also reduced the TCP degradation rate and the removal efficiency was only 8.3% in 24 h. In the field test, as the solution was injected, the oxidation reaction occurred immediately, accompanied by a sharp increase of oxidation&ndash reduction potential (ORP) and a decrease in pH. Though the concentration of pollutants increased due to the dissolution of non-aqueous phase liquid (NAPL) at the initial stage, BTEX could still be effectively degraded in subsequent time by persulfate in both aquifers, and their removal efficiency approached 100%. However, chlorinated hydrocarbon was relatively difficult to degrade, especially TCP, which had a relatively higher initial concentration, only had a removal efficiency of 30%&ndash 45% at different aquifers and monitoring wells. These finding are important for the development of injection technology for chlorinated hydrocarbon and BTEX contaminated site remediation. |
| Databáze: | OpenAIRE |
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