硝酸盐还原条件下Fe0/厌氧微生物联合体系降解2,4,6-三氯酚

Degradation of 2,4,6-trichlorophenol by Integrated Microbial-Fe0 Treatment System Under Nitrate-reducing Conditions

摘要:

本文采用间歇试验, 对硝酸盐还原条件下Fe0/厌氧微生物联合体系降解2,4,6-三氯酚(2,4,6-TCP)进行了研究。考察了不同硝酸盐浓度下, 体系中pH、硝酸盐浓度以及硝酸盐还原活性的变化情况。结果表明: 当2,4,6-TCP初始浓度为20 mg/L时, 硝酸盐对Fe0/厌氧微生物联合体系降解2,4,6-三氯酚具有明显的抑制作用; 且随着硝酸盐浓度的升高, 2,4,6-TCP的去除率降低, 硝酸盐还原活性升高; 体系先发生硝酸盐还原再进行2,4,6-TCP还原脱氯。

Abstract:

In this paper, a batch laboratory test was conducted to study the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) using an integrated microbial-Fe0 treatment system under nitrate-reducing conditions. The changes of pH, nitrate concentration, nitrate-reducing activity were detected under different nitrate concentrations. Results showed that the degradation of 2,4,6-trichlorophenol at an initial concentration of 20 mg/L was significantly inhibited under nitrate-reducing conditions. And 2,4,6-trichlorophenol removal efficiency declined and nitrate-reducing activity raised with the increase of initial nitrate concentration. Nitrate is reduced in this system followed by the reductive dechlorination of 2,4,6-trichlorophenol.