Remediation of nitrobenzene contaminated groundwater by S-NZVI and persulfate gel reaction zone
ZHU Ying-yi1,2, YE Qian1, WANG Ming-xin1, ZHANG Jin-yong1, HAN Ying1
1. School of Environmental&Safety Engineering, Changzhou University, Changzhou 213164, China; 2. Jiangsu Yangtze River Delta Environmental Science&Technology Research Institute Co. Ltd., Changzhou 213159, China
Abstract：Sulfidated-nanoscale zerovalent iron (S-NZVI) was prepared by pre-sulfide synthesis to study the degradation efficiency of nitrobenzene by S-NZVI and persulfate (PS). The degradation mechanism of reaction was investigated by detecting the change of iron ion concentration, TOC concentration and characterizing S-NZVI before and after the reaction. The S-NZVI/PS reaction zoon was established by injecting S-NZVI and gel which nano-silica solution was chosen as the binder and PS as the active components, to study the effect of in-situ remediation on simulated nitrobenzene contaminated groundwater. S-NZVI could effectively remove NB and generate a large amount of aniline (AN). The Fe2+ formed by PS oxidized S-NZVI and PS composition activate persulfate, which had a good degradation and mineralization effect on AN. When the concentration of NB was 100mg/L, the dosage of S-NZVI and PS was 0.5g/L and 2.5g/L respectively, the removal rate of NB was 91%, the effluent concentration of AN was 1.96mg/L, and the removal rate of TOC was 64.09%. The main iron oxidation products of S-NZVI after the reaction were Fe3O4 and FeO(OH). The results of reaction zone showed that the S-NZVI/PS reaction zone could effectively remove NB from groundwater and effectively remove AN produced by NB reduction. When the NB influent concentration was 100mg/L, the flow rate was 0.4mL, 1200mg/L 200mL of S-NZVI and 4.8g PS gel with 30% silica and12.5% PS was injected, the removal rate of AN was up to 97.6%and the cumulative removal rate of NB equivalent was 83.7%, within 7d.
朱颖一, 叶倩, 王明新, 张金永, 韩莹. S-NZVI/PS凝胶反应带修复硝基苯污染地下水[J]. 中国环境科学, 2020, 40(10): 4411-4420.
ZHU Ying-yi, YE Qian, WANG Ming-xin, ZHANG Jin-yong, HAN Ying. Remediation of nitrobenzene contaminated groundwater by S-NZVI and persulfate gel reaction zone. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4411-4420.
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