Effect of dissolved organic matter in runoff on the removal of Cu2+ and Pb2+ by bioretention medium

DU Xiao-li; YIN Zi-jie; CHEN Meng-yao; YU Zhen-ya

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China Environmental Science ›› 2021, Vol. 41 ›› Issue (9) : 4142-4148.

Water Pollution Control

Effect of dissolved organic matter in runoff on the removal of Cu²⁺ and Pb²⁺ by bioretention medium

DU Xiao-li^1,2, YIN Zi-jie¹, CHEN Meng-yao¹, YU Zhen-ya¹

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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.

Key words

bioretention medium / dissolved organic matter / heavy metal / runoff

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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[J]. China Environmental Science. 2021, 41(9): 4142-4148

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