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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Toxic Effects of Chlorate on Microbe and Algae in Outdoor Freshwater Microcosms
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Toxic Effects of Chlorate on Microbe and Algae in Outdoor Freshwater Microcosms

机译：氯酸盐对室外淡水微生物群落中微生物和藻类的毒性作用

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Chlorate is a toxic oxidant that is frequently found in drinking water, and agriculturally and industrially impacted surface waters. To determine the degradation of chlorate and its effects on activities of general microbial (i.e., bacteria, actinomycetes, and fungus) and algae in a freshwater system, an outdoor experiment was performed using smaller microcosms (60L) with three nutrient levels (i.e., under oligotrophic, eutrophic and hypereutrophic conditions). For each nutrient level, the microcosm design used a regression model with 3 treatments (i.e., 30mg/L chlorate, 150mg/L chlorate plus a control. Statistics indicated that mean physical and chemical water conditions were not affected by chlorate application in the microcosms significantly. The decay rate of chlorate at 150mg/L treatment was about 33% higher in the entropic conditions than in the oligotrophic condition. Further, the study indicated that chlorate restrained the growth of many bacteria and actinomycetes to some extent. Chlorophyta and Cyanophyta were insensitive to chlorate, and the growth of freshwater algae(i.e. S.obliquus and C.vulgaris) was stimulated in water with 30 mg/L chlorate and was inhibited with 150 mg/l chlorate. Our results confirm that higher nutrient levels in microcosm water can result in higher rates of chlorate cometabolism. The sensitivity of freshwater microorganisms to chlorate and the mechanism of chlorate degradation are worthy of further investigation.
机译：氯酸盐是一种有毒的氧化剂，经常在饮用水以及受到农业和工业影响的地表水中发现。为了确定氯酸盐的降解及其对淡水系统中普通微生物（即细菌，放线菌和真菌）和藻类活动的影响，使用具有三种营养水平（例如，低于贫营养，富营养和肥大状况）。对于每种营养水平，微观设计使用了3种处理的回归模型（即30mg / L的氯酸盐，150mg / L的氯酸盐再加上对照）。统计表明，在微观世界中，平均的物理和化学水状况不受氯酸盐的影响在熵条件下，150mg / L处理的氯酸盐的腐烂率比贫营养条件下高33％，而且研究表明氯酸盐在一定程度上抑制了许多细菌和放线菌的生长，对绿藻和蓝藻都不敏感。到氯酸盐的浓度，在水中加入30 mg / L的氯酸盐会刺激淡水藻类（S.obliquus和C.vulgaris）的生长，而在150 mg / l的氯酸盐中会抑制淡水藻类的生长。导致氯酸盐的新陈代谢速度加快，淡水微生物对氯酸盐的敏感性和氯酸盐降解的机理值得进一步研究。 tion。

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