摘要:
为考察氯代硝基苯的共代谢降解过程中,有机碳源类型和电子受体对氯代硝基苯厌氧降解过程的影响,以对氯硝基苯(p-CNB,para-chloronitrobenzene)为目标污染物,通过间歇试验考察了葡萄糖、乙醇、乙酸钠等有机碳源及SO42-、NO3-等竞争性电子受体对厌氧微生物降解对氯硝基苯的影响。结果显示,葡萄糖、乙醇和乙酸钠作为碳源时,菌种获得的还原能力大小依次为:乙醇>葡萄糖>乙酸钠。SO42-对菌种降解对氯硝基苯过程不产生竞争性抑制。NO3-对对氯硝基苯降解过程的影响与碳源的量有关,当乙醇-COD为100mg/L时,硝酸盐产生竞争性抑制,且抑制作用随着NO3-浓度升高而增强;当乙醇-COD为600mg/L时,硝酸盐对菌种降解对氯硝基苯过程不产生竞争性抑制作用。
Abstract:
In this paper, the effects of carbon sources and electron acceptors on the anaerobic degradation of chloronitrobenzene (CNB) during the process of co-metabolism degradation were studied. Para-chloronitrobenzene (p-CNB) was taken as the target pollutant. During the batch experiments, the effects of glucose, ethanol and sodium acetate as the organic sources and SO42- and NO3- as the competitive electron acceptors on anaerobic degradation of p-CNB were investigated. The results showed that when glucose, ethanol and sodium acetate were selected as the carbon sources, reduction capacity obtained by the microorganism was maximal with ethanol, followed by glucose and sodium acetate in a descending order. During the anaerobic degradation of p-CNB, competitive inhibition did not occur with SO42-. However, the effects of NO3- on the anaerobic degradation of p-CNB were much correlated with the amount of carbon source. When ethanol-COD was 100 mg/L, competitive inhibition occurred. The higher the NO3- concentration was, the stronger the inhibition was. However, when ethanol-COD was 600 mg/L, no competitive inhibition happened.
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