Combined control of phosphorus release from sediment by red soil and Vallisneria spiralis
ZHANG Yu1,2, YIN Yue-peng1,2, TANG Jin-yong1,2, CAO Xi1,2, LIU Jing-jing1,2, ZHANG Wen1,2,3
1. College of Environment and Ecology, Chengdu University of Technology, Chengdu 610059, China; 2. National Key Laboratory for Coordinated Control and Remediation of Water and Soil Pollution in Environmental Protection (SEKL-SW), Chengdu 610059, China; 3. State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection, Chengdu 610059, China
Abstract：The effect of single and combined remediation on phosphorus removal from polluted sediment was studied by using the in situ combined remediation technology of red soil and Vallisneria spiralis(RS +VS). The results showed that the removal capacity of sediment P by RS and VS combined remediation was higher than that by single remediation. In the 37d batch experiment, the phosphorus released from sediment in the RS+VS group was inhibited by 91%. Compared with the phosphorus released from sediment in the RS+VS group without coverage, the dissolved active phosphorus (SRP) in the overlying water decreased from 1.41mg/L to 0.12mg/L. RS+VS combined remediation had a significant effect on the fixation of sediment phosphorus, The unstable ferrous phosphorus (Fe(II)-P) and iron aluminum bound phosphorus (CDB-P) were transformed into inert calcium phosphorus (Ca-P). The content of Ca-P in sediment increased by 51%, while Fe(II)-P and CDB-P decreased by 1% and 24% respectively, effectively reducing the risk of phosphorus release from sediment to overlying water. In conclusion, RS+VS combination can be applied to treat the internal phosphorus load in eutrophic waters to realize the coordinated removal of sediment phosphorus. At the same time, RS and VS are cheap and widely distributed, and can be used as a potential high-benefit phosphate adsorbent in practical projects.
张瑜, 尹月鹏, 唐金勇, 曹熙, 刘晶京, 张雯. 天然红土与苦草联合控制沉积物中磷释放[J]. 中国环境科学, 2022, 42(8): 3728-3735.
ZHANG Yu, YIN Yue-peng, TANG Jin-yong, CAO Xi, LIU Jing-jing, ZHANG Wen. Combined control of phosphorus release from sediment by red soil and Vallisneria spiralis. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3728-3735.
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