Effect of dissolved organic matter in runoff on the removal of Cu2+ and Pb2+ by bioretention medium
DU Xiao-li1,2, YIN Zi-jie1, CHEN Meng-yao1, YU Zhen-ya1
1. Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; 2. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
Abstract:The effect of dissolved organic matter (DOM) in the road runoff on the removal of Cu2+ and Pb2+ by inert medium (soil and sand) and enhanced medium (sludge from drink water purification plant, iron-manganese binary oxides) were investigated respectively, and the major response DOM fractions and mechanisms were also detected. The results showed that runoff DOM, different DOM molecular weight fractions and chemical fractions could inhibit the removal of Cu2+ and Pb2+ by inert medium and promote the adsorption of them by enhanced medium. The DOM fractions with <1kDa molecular weight and hydrophilic fractions had the most obvious inhibitory effect or promotion effect on the adsorption of Cu2+ and Pb2+ by inert medium or enhanced medium, respectively, indicating these two DOM fractions were the key componentsaffecting the adsorption of Cu2+ and Pb2+ by bioretention medium. The existence of DOM fractions with <1kDa molecular weight reduced the adsorption capacity of Cu2+ and Pb2+ by sand medium by 62.96% and 83.70%, and increased the adsorption capacity of Cu2+ and Pb2+by iron-manganese binary oxides medium by maximum 81.16% and 4.67%, respectively. The existence of hydrophilic fractions reduced the adsorption capacity of Cu2+ and Pb2+by soil medium by 41.43% and 69.12%, and increased the adsorption capacity of Cu2+ and Pb2+by sludge from drink water purification plant by maximum 32.35% and 39.06%, respectively.
杜晓丽, 尹子杰, 陈梦瑶, 于振亚. 径流溶解性有机物对生物滞留介质去除Cu2+和Pb2+的影响[J]. 中国环境科学, 2021, 41(9): 4142-4148.
DU Xiao-li, YIN Zi-jie, CHEN Meng-yao, YU Zhen-ya. Effect of dissolved organic matter in runoff on the removal of Cu2+ and Pb2+ by bioretention medium. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4142-4148.
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