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首页> 外文期刊>Journal of Environmental Science and Health >Tolerance of a sulfidogenic sludge to trichloroethylene at microcosms level as a basis for a long-term operation of reactors designed for its biodegradation
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Tolerance of a sulfidogenic sludge to trichloroethylene at microcosms level as a basis for a long-term operation of reactors designed for its biodegradation

机译：微观污泥在微观污泥水平下对三氯乙烯的耐受作为设计用于其生物降解的反应器的长期操作的基础

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摘要

Trichloroethylene (TCE) is known as a toxic organic compound found as a pollutant in water streams around the world. The ultimate goal of the present work was to determine the TCE concentration that would be feasible to biodegrade on a long-term basis by a sulfidogenic sludge while maintaining sulfate reducing activity (SRA). Microcosms were prepared with sulfidogenic sludge obtained from a stabilized sulfidogenic UASB and amended with different TCE concentrations (100-300 mu M) and two different proportions of volatile fatty acids (VFA) acetate, propionate and butyrate at COD of 2.5:1:1 and 1:1:1, respectively to evaluate the tolerance of the sludge. The overall results suggested that the continuous exposure of the microorganisms to TCE leads to inhibition of SRA; nonetheless, the SRA can be recovered after adequate supplementation of carbon sources and sulfate. The most suitable TCE concentration to operate on a long-term basis while preserving SRA was 26-35 mg L-1 (200-260 mu M). A low level of expression of the mRNA of the sulfite reductase subunit alpha (dsrA) gene was obtained in the presence of the TCE and its intermediate products. This gene was associated to SRB belonging to the genera Desulfovibrio, Desulfosalsimonas, Desulfotomaculum, Desulfococcus, Desulfatiglans and Desulfomonas.
机译：三氯乙烯（TCE）被称为毒性有机化合物，作为世界各地的水流中的污染物。本作本作的最终目标是确定通过亚硫酸污泥的长期生物降解是可行的TCE浓度，同时保持硫酸盐还原活性（SRA）。用从稳定的磺基uAsb获得的硫化污泥制备微观污泥，并用不同的TCE浓度（100-300μm）和两种不同比例的脂肪酸脂肪酸（VFA）乙酸酯，丙酸酯在鳕鱼中，丙酸酯为2.5：1：1和1：1：1分别评估污泥的耐受性。总体结果表明，微生物对TCE的连续暴露导致SRA的抑制;尽管如此，在充分补充碳源和硫酸盐后可以回收SRA。在保存SRA的同时长期运行的最合适的TCE集中浓度为26-35mg L-1（200-260μm）。在TCE及其中间产物存在下获得亚硫酸盐还原酶亚基α（DSRA）基因mRNA的低水平。该基因与属于属脱硫，脱硫，脱硫，脱硫剂，脱硫和脱硫剂的SRB相关。

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