Abstract
Based on the principle of electro-Fenton (EF) reaction, this investigation was experimented to treat copper (Cu) and lead (Pb), which are lower mobile in dredged sediment in a self-made EF reactor, and simultaneously dewater it. The results of the study showed that when Fe2+ concentration was 1 mM, the initial current density was 10.4 mA/cm2, and the initial pH was neutral, after 24 h, the conversion of the stable form to the activated state of Cu and Pb were 24.77 % and 68.42 %, respectively. Further, the water content of the dredged sediment was significantly reduced from the initial 58–26 % after the EF. The mechanism experiment confirmed that ·OH and SO4·- were the main factors for converting Cu and Pb forms, destroying the EPS structure in the dredged sediment and decomposing its main components, improving the dewatering property of the dredged sediment. In addition, EF treatment did not decrease microbial diversity in dredged sediments, and Flavobacterium and Bacillus, which are beneficial for agricultural production, became featured taxa after EF. This study provided a new perspective that transforms Cu and Pb into a more easily removable form with simultaneous efficient dewatering, which is more conducive to subsequent conventional treatment of the dredged sediment.
Published Version
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