周石庆1,2?覮,卜令君1,2,施周1,2,许仕荣1,2,王涛1,2.电化学氧化灭活铜绿微囊藻及藻毒素的降解[J].湖南大学学报:自然科学版,2019,(6):103~108
电化学氧化灭活铜绿微囊藻及藻毒素的降解
Inactivation of Microcystis Aeruginosa by Electrochemical Oxidation and Degradation of Microcystins
  
DOI:
中文关键词:  电化学氧化  铜绿微囊藻  活性氯  细胞完整性  微囊藻毒素
英文关键词:electrochemical oxidation  Microcystis aeruginosa  active chlorine  cell integrity  microcystins
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作者单位
周石庆1,2?覮,卜令君1,2,施周1,2,许仕荣1,2,王涛1,2 (1. 湖南大学 土木工程学院湖南 长沙410082 2. 湖南大学 建筑安全与节能教育部重点实验室湖南 长沙410082) 
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中文摘要:
      利用混合金属氧化物(IrO2-Ta2O5/Ti)电极在氯化钠电解质中产生的活性氯(氯气和次氯酸)灭活铜绿微囊藻细胞. 活性氯在溶液中的生成符合法拉第定律,其浓度与电流密度和反应时间成正比. 实验系统考察了藻细胞完整性、表面形态和光合活性在电化学氧化过程中的变化,并研究了藻类有机物和微囊藻毒素(MC-LR)在该过程中的释放与降解情况. 结果表明:电化学氧化工艺可有效灭活铜绿微囊藻细胞;电流密度越大,反应时间越长,藻细胞破损程度越严重;胞外MC-LR在氧化过程中呈现先升高再降低的趋势,最终质量浓度可达到1.0 μg·L-1以下. 电化学氧化工艺不仅可以有效灭活藻细胞,还能有效控制藻细胞胞外有机物和藻毒素,因此对于高藻水处理具有良好的应用前景.
英文摘要:
      Active chlorine(chlorine and hypochlorite) was generated with NaCl electrolytes by mixed metal oxide(IrO2-Ta2O5/Ti) electrode to inactivate Microcystis aeruginosa. The generation of active chlorine abides by the Faraday's law, and its concentration is proportional to the applied current density and reaction time. The variation of integrity, surface morphology, and photosynthetic ability of Microcystis aeruginosa during the electrochemical oxidation processes(EOPs) were investigated, and the release and degradation of algal organic matters and microcystins (MC-LR) were also studied. The results indicat that the EOPs can effectively inactivate Microcystis aeruginosa, and the proportion of cell lysis increases with current density and reaction time. The concentration of extracellular MC-LR during the EOPs increased and then decreased to below 1.0 μg·L-1. The EOPs can not only inactivate Microcystis aeruginosa,but also control the concentrations of algal organic matters and MC-LR. Therefore,the EOPs have a promising application potential for treating algae-laden water.
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