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.

地下水的综合污染已变得越来越严重。将乳化植物油添加到含水层中是一种有效的多种污染物修复方法。但是，乳化植物油刺激的硝酸盐和六价铬（Cr（VI））污染的地下水的修复效率和阈值仍不清楚。在这项研究中，乳化植物油首次用于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六价铬，硝酸盐和六价铬之间存在相互作用。硝酸盐促进Cr（VI）的去除，而Cr（VI）抑制硝酸盐的还原。硝酸盐和六价铬的修复阈值分别为1600 mg / L和10 mg / L，分别（乳化植物油= 7 g / L）。对于综合污染，硝酸盐的补救阈值为868.10 mg / L，六价铬（Cr）的补救阈值为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重要作用。当乳化植物油的浓度为10.8 g / L时，硝酸盐的最高阈值为1379.79 mg / L，Cr（VI）的最大阈值为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。8 g / L时，硝酸盐的最高阈值为1379.79 mg / L，Cr（VI）的最高阈值为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。8 g / L时，硝酸盐的最高阈值为1379.79 mg / L，Cr（VI）的最高阈值为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。