改性红土与苦草联合作用控制沉积物中磷释放

邹林熹; 李丹莉; 程康龙; 张瑜; 张雯

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2780-2791.

环境生态

改性红土与苦草联合作用控制沉积物中磷释放

邹林熹^1,2, 李丹莉^1,2, 程康龙^1,2, 张瑜^1,2, 张雯^1,2,3

作者信息 +

Modified red soil combined with aquatic plants to control sediment phosphorus release

ZOU Lin-xi^1,2, LI Dan-li^1,2, CHENG Kang-long^1,2, ZHANG Yu^1,2, ZHANG Wen^1,2,3

Author information +

文章历史 +

摘要

利用天然红土(RC)和700℃煅烧的红土(CRC-700)分别联合沉水植物苦草(VS)和金鱼藻(CD)形成处理组,拟探究一种能有效控制沉积物磷(P)释放的处理技术.结果表明,VS+CRC-700对沉积物P的释放和去除效果高于其他处理组,相比对照组上覆水中溶解性活性磷(SRP)从1.38mg/L降至0.024mg/L,对不同层沉积物Fe (Ⅱ)-P和铁铝态结合磷(CDB-P)分别最多降低94和488.03mg/kg,同时对沉积物P固定作用明显,不同层沉积物中Ca-P含量最多增加182.78mg/kg.相比对照组VS+CRC-700能提高沉积物微生物群落丰度,增加5403.减少变形杆菌和拟杆菌相对丰度,分别减少了16.56%和33.33%.这些结果都表明,VS+CRC-700可视为一种廉价且具有潜力的高效P污染水体水质改善技术,应用控制弱水动力条件下水体的沉积物P释放.

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.

导出引用

邹林熹, 李丹莉, 程康龙, 张瑜, 张雯. 改性红土与苦草联合作用控制沉积物中磷释放[J]. 中国环境科学. 2025, 45(5): 2780-2791

ZOU Lin-xi, LI Dan-li, CHENG Kang-long, ZHANG Yu, ZHANG Wen. Modified red soil combined with aquatic plants to control sediment phosphorus release[J]. China Environmental Science. 2025, 45(5): 2780-2791

中图分类号： X52

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基金

国家自然科学基金资助项目(50578020);国家自然科学基金(42377082);国家环境保护土壤与水污染协同控制与联合修复重点实验室(GHBK006);四川省自然科学基金(2023NSFSC0799);地质灾害防治与地质环境保护国家重点实验室(SKLGP2023K029);长江联合研究二期项目(2022-LHYJ-02-0201)