Modified red soil combined with aquatic plants to control sediment phosphorus release
ZOU Lin-xi1,2, LI Dan-li1,2, CHENG Kang-long1,2, ZHANG Yu1,2, ZHANG Wen1,2,3
1. College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China; 2. Key Laboratory of Collaborative Control and Joint Remediation of Soil and Water Pollution in National Environmental Protection, Chengdu 610059, China; 3. State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection, Chengdu 610059, China
Abstract：This study utilized natural red clay (RC) and 700℃ calcined red clay (CRC-700) to form treatment groups combined with submerged macrophytes Vallisneria spiralis (VS) and Ceratophyllum demersum (CD), aiming to develop a treatment technology effective in controlling sedimentary phosphorus (P) release. The results demonstrated that the VS+CRC-700 treatment group exhibited superior performance in reducing and removing sedimentary P compared to other treatments. Specifically, dissolved reactive phosphorus (SRP) in the overlying water of the VS+CRC-700 group was significantly reduced from 1.38 mg/L to 0.024 mg/L compared to the control group. Additionally, the concentrations of Fe(II)-P and iron-aluminum bound phosphorus (CDB-P) in different sediment layers were maximally decreased by 94 and 488.03 mg/kg, respectively. Meanwhile, the VS+CRC-700 treatment markedly enhanced P immobilization in sediments, with Ca-P content increasing by up to 182.78mg/kg across sediment layers. Furthermore, microbial community analysis revealed that VS+CRC-700 increased sediment microbial abundance by 5403 units, while reducing the relative abundances of Proteobacteria and Bacteroidetes by 16.56% and 33.33%, respectively. These findings collectively suggest that VS+CRC-700 represents a cost-effective and high-efficiency technology for improving water quality in P-polluted systems. Its application demonstrates significant potential in controlling sedimentary P release under weak hydrodynamic conditions.
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