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Effect of dredging and capping with clean soil on the mitigation of algae-induced black blooms in Lake Taihu, China: A simulation study

文献类型： 外文期刊

作者： Zhong, Jicheng 1 ; Chen, Chao 2 ; Yu, Juhua 3 ; Shen, Qiushi 1 ; Liu, Cheng 1 ; Fan, Chengxin 1 ;

作者机构： 1.Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China

2.Sichuan Agr Univ, Coll Environm Sci, Chengdu 611130, Peoples R China

3.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Peoples R China

关键词： Sediment dredging; Capping; Algae-induced black bloom; Sediment-water interface; Eutrophic lakes

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.91； 五年影响因子：8.549 ）

ISSN： 0301-4797

年卷期： 2022 年 302 卷

页码：

收录情况： SCI

摘要： Sediment is an important source of matter that causes blackening and odor formation in a water body. The restoration of polluted sediment can suppress algae-induced black blooms to a certain degree. In this study, we compared the control effects of sediment dredging and capping with clean soil on algae-induced black blooms in Lake Taihu using indoor simulation experiments. In addition, we explored the driving effect of temperature on algae-induced black blooms using the method of gradual warming (18, 23, and 28 degrees C) during the experiment. No blackening of the water body was observed in the simulation stages I (18 degrees C) and II (23 degrees C), and the blackening and odor formation occurred within 3 d when the temperature increased to 28 degrees C in stage III, implying that high temperature was an important driving factor for algae-induced black blooms. Dredging and capping inhibited the blackening and odor formation to some extent, and the colorimetric values in the water columns were lower in the treatment groups than in the control group. At the end of the experiment, the colorimetric values of dredging and capping treatments were 56.5% and 96.7% of the colorimetric value of the control group, respectively. The control effect of dredging on the blackening elements, i.e., Fe2+ and S2- and the main odor forming compounds, i.e., dimethyl disulfide (DMDS) and dimethyl trisulfide (DMTS) was observed in stage II (11-20 d) and stage III (21-27 d), respectively, and the inhibition ability of dredging to suppress algal-induced black blooms was superior than that of capping with clean soil.

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