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硝酸盐还原条件下对氯硝基苯的生物还原转化

Effect of nitrate reduction on the microbial reductive transformation of para-chloronitrobenzene

中文摘要英文摘要

针对对氯硝基苯和硝酸盐复合污染问题,以乙醇作为共基质,通过间歇式实验,在基质充足和不足2种条件下考察了NO3-对对氯硝基苯还原过程影响。试验结果表明,在基质充足条件下,对氯硝基苯和NO3-还原过程不互相产生抑制作用,两者还原反应均符合一级反应动力学,反应速率常数分别为Kp-CNB=0.106 h-1和KNO3=0.105 h-1,半衰期(t1/2)分别为6.54 h和6.6 h。当初始COD浓度为100 mg/L,由于基质不足,NO3-对对氯硝基苯还原过程产生抑制作用,且抑制作用随着NO3-浓度升高而增强,当NO3-浓度为150 mg/L和300 mg/L时,与空白样相比对氯硝基苯还原速率分别下降20%和54%,且溶液中出现NO2-积累,浓度分别为33.68 mg/L和44.92 mg/L。当采用生物法修复地下水氯硝基苯化合物和硝酸盐复合污染时,应考虑基质的供给和硝酸盐的影响。

he effect of NO3- on para-chloronitrobenzene (p-CNB) reduction was investigated under the conditions of sufficient substrate and insufficient substrate with batch experiments due to the combined pollution of p-CNB and NO3-. Ethanol was used as co-substrate. Both p-CNB reduction and NO3- reduction proceeded successfully with sufficient substrate. The reactions followed pseudo-first order kinetics and the observed rate constants were determined as Kp-CNB=0.106 h-1 and KNO3=0.105 h-1, respectively. The half-life time (t1/2) was 6.54 h and 6.6 h. However, p-CNB reduction was inhibited by NO3- when substrate was insufficient (COD=100 mg/L). The inhibiting effect enhanced as the NO3- concentrations increased. p-CNB reduction rate decreased by 39.39% and 66.04% when compared to the control, as initial NO3- concentrations were 33.68 mg/L and 44.92 mg/L, respectively. Nitrite accumulation was also observed with a concentration of 33.68 mg/L and 44.92 mg/L in the above systems. It indicated that the effects of co-substrate and nitrate should be taken into account when anaerobic biological treatment is applied for the remediation of chloronitrobenzenes contaminated groundwater.

吴锦华、杨波、王向德、査清云、李平

环境污染、环境污染防治环境生物学生物科学现状、生物科学发展

环境工程学对氯硝基苯硝酸盐反硝化

environmental engineeringpara-chloronitrobenzenenitratedenitrification

吴锦华,杨波,王向德,査清云,李平.硝酸盐还原条件下对氯硝基苯的生物还原转化[EB/OL].(2011-01-25)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201101-1193.点此复制

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