不同电子供体对2,4-二氯酚还原脱氯的影响

Effect of Different Electron Donors on Reductive Dechlorination of 2,4-Dichlorophenol

摘要:

以葡萄糖、乙酸钠、Fe0、Fe0+葡萄糖、Fe0+乙酸钠作为电子供体, 接种未驯化厌氧混合菌, 考察2,4-二氯酚(2,4-DCP)的还原脱氯特性及Fe0作为电子供体的最佳作用条件与持续性特征。结果表明：与葡萄糖的作用相比, Fe0+葡萄糖可有效提高目标物脱氯效果; 乙酸钠、Fe0及Fe0+乙酸钠均为有效电子供体, 其中Fe0作为电子供体时目标物脱氯效果最佳, 最佳作用条件为初始pH 8.0, Fe0投加量2.0 g/L, 4-CP为其主要脱氯中间产物; Fe0可持续供给2,4-DCP还原脱氯所需电子, 而乙酸钠不断消耗后其脱氯效果与Fe0作为电子供体有明显差距。

Abstract:

A test was conducted to examine the effect of several electron donors such as glucose, sodium acetate, Fe0, Fe0+glucose and Fe0+sodium acetate on reductive dechlorination of 2,4-dichlorophenol (2,4-DCP) through inoculating the unacclimated anaerobic mixed bacteria. The optimum condition and sustainability of Fe0 as electron donor was also been discussed. The results showed that, Fe0+glucose enhanced the dechlorination of contaminant effectively compared to glucose. Sodium acetate, Fe0 and Fe0+sodium acetate were all effective electron donors and Fe0 was the optimum, the optimum initial pH was 8.0 and quantity of added Fe0 was 2.0 g/L. 4-CP was the mainly intermediate product for 2,4-DCP dechlorination. Fe0 could support the electron for reductive dechlorination of 2,4-DCP continuously. In contrast, when sodium acetate as electron donor, the effect of dechlorination was inferior to Fe0 with the consumption of sodium acetate.