Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China.
Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China.
J Hazard Mater. 2021 Mar 15;406:124708. doi: 10.1016/j.jhazmat.2020.124708. Epub 2020 Nov 28.
Combined pollution in groundwater has become increasingly serious. Adding emulsified vegetable oil to an aquifer is an effective method to remediate multiple pollutants. However, the efficiency and threshold values for the remediation of groundwater contaminated by both nitrate and hexavalent chromium (Cr(VI)) stimulated by emulsified vegetable oil remain unclear. In this study, emulsified vegetable oil was used for the first time to simultaneously remediate nitrate and Cr(VI) in groundwater. The results suggested that the addition of emulsified vegetable oil could effectively remediate nitrate and Cr(VI), and there were interplay effects between nitrate and Cr(VI). Nitrate promoted Cr(VI) removal, while Cr(VI) inhibited nitrate reduction. The remediation thresholds for nitrate and Cr(VI) alone were 1600 mg/L and 10 mg/L, respectively (emulsified vegetable oil = 7 g/L). For combined pollution, the remediation threshold values were 868.10 mg/L for nitrate and 12.43 mg/L for Cr(VI) (emulsified vegetable oil = 7 g/L). The dose of emulsified vegetable oil played an important role in the threshold value. When the concentration of emulsified vegetable oil was 10.8 g/L, the maximum threshold values were 1379.79 mg/L for nitrate and 12.67 mg/L for Cr(VI). When the pollutant concentration was below the threshold value, the contaminant could be completely removed.
地下水的复合污染问题日益严重。在含水层中添加乳化植物油是修复多种污染物的有效方法。然而，利用乳化植物油修复受硝酸盐和六价铬（Cr(VI)）污染的地下水的效率和阈值尚不清楚。本研究首次利用乳化植物油同时修复地下水中的硝酸盐和 Cr(VI)。结果表明，添加乳化植物油可以有效地修复硝酸盐和 Cr(VI)，且硝酸盐和 Cr(VI)之间存在相互作用。硝酸盐促进了 Cr(VI)的去除，而 Cr(VI)则抑制了硝酸盐的还原。硝酸盐和 Cr(VI)单独的修复阈值分别为 1600 mg/L 和 10 mg/L（乳化植物油=7 g/L）。对于复合污染，硝酸盐和 Cr(VI)的修复阈值分别为 868.10 mg/L 和 12.43 mg/L（乳化植物油=7 g/L）。乳化植物油的剂量在阈值中起着重要作用。当乳化植物油的浓度为 10.8 g/L 时，硝酸盐和 Cr(VI)的最大阈值分别为 1379.79 mg/L 和 12.67 mg/L。当污染物浓度低于阈值时，污染物可以被完全去除。
