International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China.
International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China.
J Hazard Mater. 2024 Dec 5;480:135885. doi: 10.1016/j.jhazmat.2024.135885. Epub 2024 Sep 17.
Dissolved organic matter (DOM) present in aquatic environments can significantly influence microalgal metabolism and the enrichment of heavy metals. However, the specific mechanism through which typical DOM affects the enrichment of the heavy metal chromium (Cr) in green algae remains unclear. This study investigates the impacts of varying concentrations of humic acid (HA), selected as a representative DOM in water, on the growth, metabolism, and Cr enrichment in Chlorella vulgaris, a typical green alga. The results indicated that low concentrations of HA were capable of enhancing Cr enrichment in C. vulgaris, with the highest Cr enrichment rate recorded at 41.50 % at TOC = 10 mg/L. The enrichment of Cr in algal cells primarily occurred through cell proliferation and complexation reduction of extracellular polymeric substances (EPS). In the presence of HA, C. vulgaris predominantly removed Cr through extracellular adsorption, accounting for 79.76-85.88 % of the total Cr removal. Furthermore, carboxyl complexation and hydroxyl reduction within EPS facilitated both the enrichment of Cr (18.72-21.49 %) and the reduction of Cr(VI) (63.93-74.10 %). These findings provide valuable insights into strategies for mitigating heavy metal pollution and managing associated risks in aquatic environments.
水中的溶解有机物（DOM）会显著影响微藻的代谢和重金属的富集。然而，典型的 DOM 影响绿藻中重金属铬（Cr）富集的具体机制仍不清楚。本研究探讨了不同浓度的腐殖酸（HA）（作为水中 DOM 的代表）对普通绿藻小球藻生长、代谢和 Cr 富集的影响。结果表明，低浓度的 HA 能够增强 Cr 在 C. vulgaris 中的富集，在 TOC=10mg/L 时，Cr 的最高富集率为 41.50%。藻类细胞中 Cr 的富集主要通过细胞增殖和细胞外聚合物（EPS）的络合还原来实现。在 HA 存在的情况下，C. vulgaris 主要通过细胞外吸附去除 Cr，占总 Cr 去除量的 79.76-85.88%。此外，EPS 内的羧基络合和羟基还原既促进了 Cr 的富集（18.72-21.49%），又促进了 Cr(VI)的还原（63.93-74.10%）。这些发现为减轻重金属污染和管理水生环境中相关风险提供了有价值的策略。
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