驯化的活性污泥强化降解土壤中氯酚的研究

Biodegradation of chlorophenols in soil by the acclimated activated sludge

以接种驯化的活性污泥为生物强化手段,在小型生物泥浆反应器中,研究了受氯酚污染土壤的修复情况。考查了添加驯化活性污泥对土壤中氯酚降解的强化效果,并对土壤中邻氯苯酚(2-CP)、对氯苯酚(4-CP)和2,4-二氯酚(2,4-DCP)在单一污染体系中的降解情况进行了研究。结果表明,在生物泥浆反应器中添加用邻氯苯酚(2-CP)驯化的活性污泥可以明显地促进土壤泥浆中2-CP的降解,是一种有效的强化手段。该方法对土壤中的4-CP和2,4-DCP也有较好的降解效果,对三种氯酚的降解速率由大到小的顺序为2-CP,4-CP,2,4-DCP。反应结束时,泥浆体系中剩余的氯酚基本都残留在土壤中,固液分离后的水相可以直接排放或者在土壤修复过程中循环利用。

Studies were carried out on the bioremediation of soil polluted by chlorophenols in bench-scale bioslurry reactors, adding the acclimated activated sludge for bioaugmentation. This paper examined the contribution of bioaugmentation by acclimate activated sludge to chloropheol degradation, and then studied the degradation of 2-chlorophenol（2-CP）, 4-chlorophenol（4-CP） and 2,4-Dichlorophenol（2,4-DCP） in single-polluted soil. Results showed that addition of activated sludge acclimated with 2-CP could greatly improve the degradation of 2-CP in slurry. This method could also be used to degrade 4-CP and 2,4-DCP in single-polluted soil, and the order of degradation speed was 2-CP〉4-CP〉2,4-DCP. At the end of reaction, almost all of the chlorophenols remained in the soil, and the water separated from the slurry could be directly discharged or be reused in the soil remediation.