摘要
分别以不同浓度梯度的H_2O_2为氧化剂,研究其对铜绿微囊藻致嗅物质β-环柠檬醛的去除效果和藻细胞的灭活程度.结果表明,当藻细胞密度为1.01×10~6cells·m L^(-1)时,H_2O_2对胞外β-环柠檬醛的氧化较为迅速,反应1 min内即可去除75%以上,而对胞内β-环柠檬醛的降解比较缓慢,只有在投加4或5 mg·L^(-1)时才能取得显著效果;其降解的二级动力学速率常数为57.12 L·mol^(-1)·s^(-1);H_2O_2的氧化能力相对较弱,不足以导致藻细胞剧烈破碎,但也因此而减少了藻毒素的释放;并且H_2O_2可使溶解性有机物各个组分的荧光强度明显降低,荧光峰中心位置也发生了一定的偏移;因细胞壁和细胞膜受到损害,浓度为4 mg·L^(-1)以上的H_2O_2能够充分灭活藻细胞.
The removal efficiency of odor compound β-cyclocitral and inactivation of algal cells on Microcystis aeruginosa were studied with different concentrations of hydrogen peroxide. The results show that the oxidation of extracellular β-cyclocitral by hydrogen peroxide was rapid when the density of algal cells was 1.01×10-6cells·m L^-1,and the removal efficiency could be more than 75% within 1 min,while the degradation of intracellular β-cyclocitral was relatively slow,and significant effect could be achieved only under the condition of 4 or 5 mg·L^-1hydrogen peroxide. The secondary rate constant of degradation was 57.12 L·mol^-1·s^-1. The oxidation ability of hydrogen peroxide was not strong enough to significantly disrupt the algal cells,and it also avoided the release of microcystin. Additionally,hydrogen peroxide could make the dissolved organic matter decrease clearly,and the fluorescence peaks of DOM also had red-or blue-shifts. Due to the damage of the cell wall and cell membrane,over 4 mg·L^-1of hydrogen peroxide could inactivate algal cells completely.
作者
邱丽佳
张君枝
张艳娜
马文林
陈汉
张质明
QIU Lijia ZHANG Junzhi ZHANG Yanna MA Wenlin CHEN Han ZHANG Zhiming(Beijing Climate Change Response Research and Education Center, Key Laboratory of Urban Storm Water System and Water Environment, Beijing University of Civil Engineering and Arehiteeture, Beijing 100044 Researeh Institute of Petroleum Exploration ＆ Development, Beijing 100083)
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第3期954-961,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.51408022)
国家水体污染控制与治理科技重大专项课题(No.2015ZX07406001)
北京市优秀人才培养资助项目(No.2013D005017000009)
北京市自然科学基金项目(No.8154044)~~
关键词
H2O2
铜绿微囊藻
β-环柠檬醛
灭藻效应
hydrogen peroxide
Microcystis aeruginosa
β-cyclocitral
inactivation efficiency
