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[目的]了解海口某水厂水源水及不同处理阶段水的藻密度,及其与水质理化、感官指标的相关性,为集中式供水藻类预防及控制提供依据。[方法]于2013年4—5月,对海口市某水厂水源水藻密度、pH、温度、硝酸盐氮、氨氮、正磷酸盐、浑浊度和色度进行检测,同期检测该厂不同处理阶段(集水槽和滤后)水质藻密度,计算藻类去除率。对上述指标进行Pearson相关分析。[结果]该水厂水源水的藻密度为(5.47±1.69)×106个/L、浑浊度为(7.33±0.23)NTU、色度为(18.24±0.22)度,氨氮为(0.16±0.04)mg/L,硝酸盐氮为(0.46±0.13)mg/L,正磷酸盐为(0.02±0.01)mg/L,pH为7.48,温度为26.8℃。集水槽和滤后水藻类密度分别为(1.15±0.95)×106个/L和(0.81±0.06)×106个/L,出厂水藻密度为1.10×105个/L。水处理过程中去除率分别为:藻密度85.2%、浑浊度83.2%、色度75.4%。源水藻密度与色度、温度成正相关(P<0.05),与正磷酸盐含量呈负相关性(P<0.05)。蓝藻门藻密度与硝酸盐氮含量呈正相关(P<0.05)。[结论]该水厂水源水藻密度较高,并与色度、温度呈正相关,蓝藻密度与硝酸盐氮呈正相关,需关注硝酸盐氮污染对有毒藻的促生长作用。
[Objective] The research aimed to understand the density of water source water and the different treatment stages of seawater in a certain water plant in Haikou, and its correlation with the physicochemical and sensory indexes of water quality, so as to provide basis for the prevention and control of centralized water supply algae. [Method] From April to May 2013, the density of algae, pH, temperature, nitrate nitrogen, ammonia nitrogen, orthophosphates, turbidity and color of a water plant in Haikou City were tested. In the same period, different treatment phases (Sump and filter) water quality algae density, calculate algae removal rate. Pearson correlation analysis of the above indicators. [Result] The water density of tap water was 5.47 ± 1.69 × 106 / L, the turbidity was 7.33 ± 0.23 NTU, the color of water was (18.24 ± 0.22) degrees, the ammonia nitrogen was (0.16 ± 0.04) (0.46 ± 0.13) mg / L for nitrate nitrogen, (0.02 ± 0.01) mg / L for orthophosphate, pH 7.48, and temperature of 26.8 ℃. The density of sump and filtrate algae were (1.15 ± 0.95) × 106 / L and (0.81 ± 0.06) × 106 / L, respectively. The density of excreted algae was 1.10 × 105 / L. Water treatment process removal rates were: algae density 85.2%, turbidity 83.2%, color 75.4%. The density of source algae was positively correlated with chroma and temperature (P <0.05), but negatively correlated with orthophosphate content (P <0.05). There was a positive correlation between the density of cyanobacteria and the nitrogen content of nitrate (P <0.05). [Conclusion] The density of water source algae in this water plant was high, and it was positively correlated with the color temperature and temperature. The density of cyanobacteria was positively correlated with nitrate nitrogen, and the growth promoting effect of nitrogenous nitrate on the toxic algae should be concerned.