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Electroactive ecological floating bed coupled with submerged plants: revealing phosphorus conversion mechanisms in
Menglong Liao1, Ye Qiu1, Yunlong Ji1
1State Key Laboratory of Urban-rural Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
Abstract:
Remediation of phosphorus-contaminated aquaculture tailwater is imperative to mitigate its detrimental impacts on aquatic ecosystem. In the study, an innovative electroactive ecological floating bed coupled with submerged plants system (EEFB-PS) was designed for this purpose. EEFB-PS exhibited superior phosphorus removal efficiency (76.44%) in the overlying water than other systems. A key factor was the uniform internal electric field, which drove the directional migration of phosphate towards the sediment, where adsorption fixation accounted for 34.40% of influent phosphorus, 4.98-fold higher than EFB-PS. Meanwhile, phosphorus removal via synergistic plant absorption contributed 35.58%. Sediment analysis revealed a novel electric field-mediated transformation pathway: organic phosphorus (OP) was decomposed to inorganic phosphate, subsequently formed the stable forms like HCl-P, BD-P, and NaOH-P, preventing the release into the overlying water. The dual mechanism of sediment fixation and plant uptake in EEFB-PS provides insights into the electro-biological synergy for sustainable phosphorus management in aquaculture systems.
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