XUJia-hui,ZHAIHong-yan,SUNLing,et al.Algal Characteristics and Deposition in Regulating Tank of a Terminal Pumping Station Belonged to the South-to-North Water Diversion Project[J].China Water & Wastewater,2024,40(13):34-42.
南水北调终端泵站调节池内藻类特征和沉积分析
- Title:
- Algal Characteristics and Deposition in Regulating Tank of a Terminal Pumping Station Belonged to the South-to-North Water Diversion Project
- Keywords:
- South-to-North Water Diversion Project; algae; sediment; regulating tank; water supply safety
- 摘要:
- 南水北调水源终端城市泵站调节池中的高有机物泥沙淤积是目前急需解决的运行问题，已经影响到供水水质稳定和成本，然而定量分析藻类对淤积问题的影响还鲜见报道。为此，调研了2021年4月—10月泵站调节池进水、池内水体、出水以及底泥中的藻种类和藻密度，估算了藻细胞质量及其对悬浮固体和淤积底泥的质量贡献。研究发现，引江水中的藻类均以硅藻（Bacillariophyta）为主，其次是绿藻（Chlorophyta）和蓝藻（Cyanophyta）。6月—9月调节池进水、池内水体、出水中的藻密度分别高达（2.10~2.73）×106、（0.55~4.20）×106、（1.06~1.22）×106 个/L。经计算，调节池进水、池内水体、出水中的藻细胞质量浓度最高可达5.04、3.35、2.31 mg/L，淤泥中被计数的藻细胞质量浓度为17~984 μg/g。藻细胞质量浓度占悬浮固体浓度的2%~77%（平均为36%）。大量藻类滞留在调节池内，据估算，夏季滞留在调节池内的藻类质量浓度为0.60~2.72 mg/L，占SS的9.2%~52%，夏季高藻期30 d进水最多携带几十吨至几百吨藻细胞进入并滞留在调节池，而且藻细胞在调节池还会发生增殖，这将严重影响调节池的水质和供水安全。
- Abstract:
- The current deposition of sediment with high organic content in the regulating tank of a terminal pumping station belonged to the South-to-North Water Diversion Project has become an urgent operational problem, which has affected the stability of the water supply quality and the operational cost. However, quantitative analysis of the effect of algae on sediment deposition is rarely reported. In this study, the species and density of algae in the influent, inside, effluent and sediment of the regulating tank from April to October 2021 were investigated, and the algae mass and its contribution to the suspended solids and sediment were estimated. Bacillariophyta was the dominant algal species in the Yangtze River raw water, followed by Chlorophyta and Cyanophyta. From June to September, the algal densities in the influent, inside and effluent of the regulating tank were as high as 2.10×106-2.73×106 cells/L, 5.50×105-4.20×106 cells/L and 1.06×106-1.22×106 cells/L, respectively. The maximum mass concentration of algal cells in the influent, inside and effluent of the regulating tank was 5.04 mg/L, 3.35 mg/L and 2.31 mg/L, respectively, and the mass concentration of the recorded algal cells in the sediment was 17-984 μg/g. The mass concentration of algal cells accounted for 2% to 77% (average 36%) of the suspended solids. Large amounts of algae remained in the tank. The mass concentration of algae retained in the regulating tank in summer was estimated to be 0.60-2.72 mg/L, accounting for 9.2%-52% of the suspended solids. The influent introduced ten to hundred tons of algal cells into the regulating tank at most during the 30 days high algae period in summer, and algal cells retained and proliferated in the regulating tank, which seriously affected the water quality and water supply safety.
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