Evaluation of a laboratory-scale bioreactive in situ sediment cap for the treatment of organic contaminants.
Evaluation of a laboratory-scale bioreactive in situ sediment cap for the treatment of organic contaminants.
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DOI：
10.1016/j.watres.2011.06.022
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发表时间：
2011-11-01
期刊：
影响因子：
12.8
通讯作者：
Hughes, Joseph B.
中科院分区：
文献类型：
--
作者：
Himmelheber, David W.;Pennell, Kurt D.;Hughes, Joseph B.
生物活性沉积物盖的发展，其中能够污染物转化的微生物被放置在原位盖内，提供了一种潜在的补救设计，可以可持续地处理沉积物和地下水污染物。本研究的目的是评估的能力和限制的混合，厌氧脱氯财团处理氯化乙烯在砂基帽。批处理实验的结果表明，四氯乙烯（PCE）到乙烯的混合财团是能够完全脱氯溶解相PCE乙烯时，只提供从沉积物柱获得的沉积物孔隙水。为了模拟生物活性帽，将接种有混合培养物的实验室规模的砂柱与上流沉积物柱串联放置，并直接提供沉积物流出物和溶解相氯化乙烯。混合财团是无法维持脱氯活性在保留时间为0.5天，没有交付的修正案的沉积物流出物，证明了损失的顺式-1，2-二氯乙烯（顺式-DCE）脱氯氯乙烯。当可溶性电子供体提供给沉积物流出物，完全脱氯的顺式-DCE乙烯观察到在保留时间为0.5天，这表明沉积物流出物缺乏足够的电子供体，以保持活性脱氯内的沉积物帽。引入高浓度的污染物也限制了上限内的脱氯财团的生物转化性能。这些研究结果表明，原位生物活性封盖可以是一种可行的补救方法，只要停留时间是足够的，并且适当水平的电子供体和污染物存在的上限。
The development of bioreactive sediment caps, in which microorganisms capable of contaminant transformation are placed within an in situ cap, provides a potential remedial design that can sustainably treat sediment and groundwater contaminants. The goal of this study was to evaluate the ability and limitations of a mixed, anaerobic dechlorinating consortium to treat chlorinated ethenes within a sand-based cap. Results of batch experiments demonstrate that a tetrachloroethene (PCE)-to-ethene mixed consortium was able to completely dechlorinate dissolved-phase PCE to ethene when supplied only with sediment porewater obtained from a sediment column. To simulate a bioreactive cap, laboratory-scale sand columns inoculated with the mixed culture were placed in series with an upflow sediment column and directly supplied sediment effluent and dissolved-phase chlorinated ethenes. The mixed consortium was not able to sustain dechlorination activity at a retention time of 0.5 days without delivery of amendments to the sediment effluent, evidenced by the loss of cis-1,2-dichloroethene (cis-DCE) dechlorination to vinyl chloride. When soluble electron donor was supplied to the sediment effluent, complete dechlorination of cis-DCE to ethene was observed at retention times of 0.5 days, suggesting that sediment effluent lacked sufficient electron donor to maintain active dechlorination within the sediment cap. Introduction of elevated contaminant concentrations also limited biotransformation performance of the dechlorinating consortium within the cap. These findings indicate that in situ bioreactive capping can be a feasible remedial approach, provided that residence times are adequate and that appropriate levels of electron donor and contaminant exist within the cap.
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