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一种新型消毒剂的杀藻研究 总被引:13,自引:0,他引:13
由藻类过量繁殖引发的富营养化所造成的危害越来越严重并日益受到关注,采用钠法工艺生产的次氯酸钙是一种无残毒,不产生二次污染的高效广谱灭菌药物,对该药物的杀灌效率进行了生物测试的结果表明,它能有效地杀灭引发水华的绿藻,蓝藻和硅藻,≥62.5ppm(有效氯含量,下同)曝露96h,4种被试藻类的死亡率可达92%-100%,高浓度(500ppm)条件下,绿藻,蓝藻和藻分别在几分钟和1h内全部死亡,≤1p pm的浓度对4种被试藻类基本上不造成严重伤害。 相似文献
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采用去藻247处理滇池草海出口处水样进行试验,结果表明,在大比例投加药剂时,去藻247在0~20mg/L这一范围内的除藻效果较好,且随着投加量的增加,其去除效果越好;在精确投加时,当投加量为20 mg/L时,其去除效果最佳.其中叶绿素、TP的平均去除率达到27.0%和25.3%,对TN也有一定的去除.使用去藻247后,通过测定铜离子残留浓度可知,水样中铜离子的残留浓度在10天之内就迅速降低,且远低于国家饮用水标准中铜离子的允许值1.0mg/L,因此该药剂对水体无二次污染,去藻247是一种具有进一步研究价值的除藻剂. 相似文献
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Critical review of actually available chemical compounds for prevention and management of cyanobacterial blooms 总被引:3,自引:0,他引:3
Cyanobacteria proliferation is among the most threatening consequences of freshwater pollution. Health risks from human and other-organism exposure to cyanobacteria have led to an effort to find practical methods for cyanobacterial water-bloom reduction. Hence, methods and techniques have been developed in order to reduce the amount of phosphorus or to decrease the abundance of nuisance phytoplankton species directly in the water bodies (in-lake measures). Although these “acute” methods do not solve the problem of catchment area eutrophication, they are cheaper, easier to manage, and for some areas they are the only way to protect human and environmental health against massive cyanobacterial proliferation. This review summarizes the extent of knowledge and published data about the management using metals (Al, Fe, Cu, Ag, Ca), photosensitizers (hydrogen peroxide, phthalocyanines, TiO2), herbicides and chemicals derived from natural compounds as fast and efficient removal agents of cyanobacteria. This review concludes that some compounds, when non-persistent and ecotoxicologically acceptable may help to manage cyanobacterial blooms in an efficient way compared to previous methods (e.g. copper sulfate). 相似文献
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Nathalia Garlich Claudinei Da Cruz Adilson F. Da Silva Silvia P. Carraschi Igor C. Malaspina Robinson A. Pitelli 《Journal of environmental science and health. Part. B》2016,51(4):215-221
The aims of this research were to evaluate the efficacy of copper oxychloride (CuCl2.3Cu(OH)2), copper hydroxide (Cu(OH)2) and diquat (1.1′-ethylene-2.2′-bipyridyldiylium dibromide), isolated and in association with 0.1% of both copper sources, in the control of the unicellular algae Ankistrodesmus gracilis and the filamentous algae Pithophora kewesis, and to determine the acute toxicity of the tested chemicals in Hyphressobrycon eques, Pomacea canaliculata, Lemna minor and Azolla caroliniana. The efficacy was estimated by the methods of chlorophyll a and pheophytin a readings, changed into growth inhibition percentage. Both algae were exposed to the following concentrations: 0.2; 0.4; 0.8; 1.2 mg L?1 of diquat and its association with the copper sources; and 0.1; 0.3; 0.5; 0.7; 1.0 and 1.5 mg L?1 in the isolated applications of copper hydroxide and copper oxychloride. An untreated control was kept. The acute toxicity was estimatedby 50% lethal concentration (LC50). The copper sources were effective for A. gracilis control, at rates as high as 0.1 mg L?1 (>95% efficacy). Isolated diquat and its association with copper hydroxide were both effective at rates as high as 0.4 mg L?1, with 95 and 88% control efficacy, respectively. The copper oxychloride was effective at 0.2 mg L?1, with 93% efficacy. None of the tested chemicals and associations was effective on P. kewesis control. The most sensitive non target organism to the tested chemicals was L. minor; the less sensitive was H. eques. 相似文献
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