Soil-Based Treatments of Mechanically Collected Cyanobacterial Blooms from Lake Taihu: Efficiencies and Potential Risks

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• 作者：Wei Chen ; Yunlu Jia ; Enhua Li ; Shuang Zhao ; Qichao Zhou ; Liming Liu ; Lirong Song
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：December 18, 2012
• 年：2012
• 卷：46
• 期：24
• 页码：13370-13376
• 全文大小：325K
• 年卷期：v.46,no.24(December 18, 2012)
• ISSN：1520-5851

文摘

In China, mechanical collection of cyanoblooms followed by soil-based treatments has been widely used as emergency strategies in many eutrophicated freshwaters. This study was to evaluate both efficiencies and potential risks of typical soil-based technologies. Results from this study indicated that over 90% of cyanobacterial biomass and 96% of dissolved microcystins (MCs) could be restrained in soils via three-level systems, which were much better than single-level systems. High concentrations of MCs, ranged from 65 to 276 ng g^鈥? and from 2.12 to 6.6 ng g^鈥?, were found in soils around treatment systems and croplands, respectively. In the soil solutions, MCs ranged from 0.35 to 2.0 渭g L^鈥?, showing a potentially high leaching risk. In the samples from shallow groundwater near the treatment systems, MC concentrations were detected as high as 1.2 渭g L^鈥?. Moreover, bioaccumulations of MCs varied between 22 and 365 渭g kg^鈥?, and 19鈥?22 渭g kg^鈥? were found in 13 kinds of crops and 7 kinds of wild grass, respectively. Our results indicated for the first time that current soil-based technologies were effective but could pose potential environmental, ecological, and public health risks. Further improvements of these technologies were also proposed based on our findings.