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Fate of Chlorinated Benzenes in Laboratory Peat and Pozzolana Filters

机译:实验室泥炭和火山灰过滤器中氯化苯的命运

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The removal of chlorinated benzenes (CBs) from the compartments and from polluted industrial sites is of great public interest for the decontamination of polluted water and for the protection of the environment. Biological degradation could be considered as a feasible process to eliminate these compounds from the environment as soil or groundwater. A research program in progress since the year 2007 was initiated to investigate the capacity of eco-remediation of CB-contaminated groundwater using a pilot-scale subsurface flow constructed wetland. In order to assess the removal efficiency of these compounds and to evaluate the biological activities, column experiments were performed. The fate of three CBs was investigated by feeding spiked tap water through laboratory columns filled with two different solid-state materials: peat and pozzolana. In order to stimulate biological activity, organic matter coming from aged vertical flow constructed wetland was added to the media. Concentrations of CBs in water effluent and in air and biological activities were monitored during 4 months. At the end of the experimental period, CB concentrations in the depth of columns were determined and a mass balance was calculated for the CBs. Removal efficiencies of the laboratory columns were >98% in the peat columns and situated around 87% to 95% in the pozzolana columns, indicating the suitability of the experimental systems for the removal of CBs. Higher effluent CB concentrations from the pozzolana columns were detected. Concentration of CBs in ambient air indicates that volatilization was low. ATP monitoring, reduction of tetrazolium violet, and exopolysaccharide determination indicated considerable biological activity with variations according to column depth and carrier material.
机译:从车厢和污染的工业场所中除去氯苯对于净化污水和保护环境具有重大的公共利益。生物降解可以被认为是从土壤或地下水等环境中消除这些化合物的可行方法。自2007年以来,正在启动一项研究计划,以使用中试规模的地下流人工湿地调查对CB污染的地下水进行生态修​​复的能力。为了评估这些化合物的去除效率并评估其生物学活性,进行了柱实验。通过向装有两种不同固态材料(泥炭和火山灰)的实验室色谱柱中注入加标的自来水,研究了三种可转债的命运。为了激发生物活性,将来自老化的垂直流人工湿地的有机物添加到培养基中。在4个月内监测了废水,空气和生物活动中CB的浓度。在实验期结束时,确定柱深处的CB浓度,并计算出CB的质量平衡。在泥炭柱中,实验室柱的去除效率> 98%,在火山灰柱中的去除效率在87%至95%左右,这表明该实验系统适用于去除CB。从火山灰柱中检测到较高的出水CB浓度。环境空气中CB的浓度表明挥发低。 ATP监测,四唑紫罗兰的还原和胞外多糖的测定表明,根据柱深和载体材料的不同,生物活性相当大。

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