Ehlers George A, Rose Peter D
Environmental Biotechnology Research Unit, Rhodes University, Grahamstown, South Africa.
Water Environ Res. 2006 Jul;78(7):701-9. doi: 10.2175/106143006x101728.
An investigation of biodegradation of chlorinated phenol in an anaerobic/aerobic bioprocess environment was made. The reactor configuration used consisted of linked anaerobic and aerobic reactors, which served as a model for a proposed bioremediation strategy. The proposed strategy was studied in two reactors before linkage. In the anaerobic compartment, the transformation of the model contaminant, 2,4,6-trichlorophenol (2,4,6-TCP), to lesser-chlorinated metabolites was shown to occur during reductive dechlorination under sulfate-reducing conditions. The consortium was also shown to desorb and mobilize 2,4,6-TCP in soils. This was followed, in the aerobic compartment, by biodegradation of the pollutant and metabolites, 2,4-dichlorophenol, 4-chlorophenol, and phenol, by immobilized white-rot fungi. The integrated process achieved elimination of the compound by more than 99% through fungal degradation of metabolites produced in the dechlorination stage. pH correction to the anaerobic reactor was found to be necessary because acidic effluent from the fungal reactor inhibited sulfate reduction and dechlorination.
对厌氧/好氧生物处理环境中氯酚的生物降解进行了研究。所使用的反应器配置由相连的厌氧和好氧反应器组成，其作为一种拟议的生物修复策略的模型。在连接之前，在两个反应器中对拟议的策略进行了研究。在厌氧隔室中，在硫酸盐还原条件下的还原脱氯过程中，模型污染物2,4,6 - 三氯酚（2,4,6 - TCP）被转化为氯化程度较低的代谢物。该菌群还被证明能使土壤中的2,4,6 - TCP解吸并迁移。随后，在好氧隔室中，固定化白腐真菌对污染物及其代谢物2,4 - 二氯酚、4 - 氯酚和苯酚进行生物降解。通过对脱氯阶段产生的代谢物进行真菌降解，该集成过程实现了化合物去除率超过99%。发现有必要对厌氧反应器进行pH校正，因为真菌反应器的酸性流出物会抑制硫酸盐还原和脱氯。
