景观水灭藻处理的研究

Extermination of Algae in Water Used for Landscape

目的研究铜电解及其组合技术工艺对景观水中藻类的杀灭效果。方法在实验室灭藻实验中,取在BG11培养液中生长达到稳恒期的集胞藻(PCC6803)10ml,加入盛有60L纯净水的储水箱中,分别进行加硫酸铜和铜电解灭藻处理。在处理的第0、0.5、1、2、3h,分别取加硫酸铜组、铜电解组和空白对照组约1ml水样,检测藻细胞数。在现场试验中,分别采用单纯铜电解技术工艺和铜电解组合技术工艺对景观水体进行灭藻处理。在处理的第1、3、5、7、9、12天采集水样,对藻细胞进行计数,并按照《水和废水检测分析方法》(2002)检测浑浊度、嗅阈值、化学需氧量(COD)、氨氮、溶解氧、铜离子浓度、pH值。结果实验室灭藻结果显示,当铜离子浓度在0.3mg/L时,铜电解组在作用0.5h,加硫酸铜组在3h时,培养皿上无藻细胞生长;未处理组在3h时,培养皿上藻细胞增加。单纯铜电解技术工艺灭藻结果显示,随着时间的推移,景观水中藻细胞数逐渐降低。处理第12天时,除藻率为68.84%。除嗅阈值外,其他指标无明显改善。铜电解组合技术工艺灭藻结果显示,处理第12天,除藻率为80.75%,浑浊度、嗅阈值、COD、氨氮分别下降了57.14%,50.00%,48.44%,39.13%,溶解氧增加了66.67%。结论铜电解释放的铜离子具有较强的灭藻效果,且较硫酸铜作用强;铜电解组合技术工艺对综合改善景观水质有显著效果。

Objective To assess the efficiency of algae extermination by the combined copper electrolysis technology. Methods The combined copper electrolysis technology and copper sulphate were used to treat the Synechocystissp （strain PCC6803） in the steady stage of culture in different time and the efficiency of algae extermination was assessed. Results No alga in the water sample was detected after 0.5 and 1 hour of treatment with copper electrolysis technology and copper sulphate respectivly as the concentration of Cu^2＋ was at 0.3 mg/L. The extermination rate of algae was 80.75% after 12 days of treatment of combined copper electrolysis. This technology could effectively decrease the turbidity, smell, COD, ammonia nitrogen and increase the dissolved oxygen in the treated water. Conclusion The Cu^2＋ released by copper electrolyzing has a stronger efficiency of algae extermination compared with copper sulfate. The combined copper electrolysis technology will be a satisfactory method for algae extermination in the landscape water.