紫外辐射对小球藻混凝效果作用途径探讨

发布时间：2018-01-26 01:22

本文关键词： 紫外线辐射混凝去除绿藻　出处：《环境科学》2016年01期 　论文类型：期刊论文

【摘要】：针对藻类在常规水处理过程中难以被有效去除的现状,采用紫外辐射对藻类混凝过程进行强化处理.结果表明,随着紫外照射时间的增加,混凝后对藻细胞和浊度的去除均呈先上升后下降的趋势,并在照射50 min时达到最大值.PAC(聚合氯化铝)投加量为5 mg·L~(-1)时,照射样的除藻率和去浊率达到最大,分别比空白样高20.1%和18%左右.pH值在6~9范围内,紫外辐射强化混凝效果的变化较小.溶液pH=8、紫外照射50 min,混凝后的除藻率和去浊率分别达到了93.5%和90.6%.此时,藻细胞Zeta电位最大,同时释放出藻黏液,有利于混凝沉降.而当紫外照射超过60 min后,出现细胞膜破裂,胞内有机物渗出,使得溶液中的有机物浓度急剧上升,Zeta电位开始下降,不利于后续混凝的进行.
[Abstract]:In view of the current situation that algae is difficult to be effectively removed in the conventional water treatment process, the algae coagulation process is enhanced by ultraviolet radiation. The results show that with the increase of ultraviolet irradiation time. After coagulation, the removal of algal cells and turbidity increased first and then decreased, and reached the maximum value at 50 min, when the dosage of PAC (polyaluminium chloride) was 5 mg 路L ~ (-1). The algal removal rate and turbidity removal rate of irradiated samples were the highest, which were about 20.1% and 18% higher than that of blank samples, respectively. In the range of 6 ~ 9, the effect of ultraviolet radiation enhanced coagulation had little change. Solution pH=8. The algae removal rate and turbidity removal rate reached 93.5% and 90.6 respectively after external irradiation of purple for 50 min. At this time, the Zeta potential of algal cells was the highest, and the algae mucus was released at the same time. When ultraviolet irradiation was more than 60 min, cell membrane ruptured and intracellular organic matter exudated, which caused the concentration of organic matter in solution to rise sharply and the Zeta potential began to decrease. It is unfavorable to the subsequent coagulation.
【作者单位】：西安建筑科技大学环境与市政工程学院;浙江清华长三角研究院生态环境研究所;
【基金】：国家自然科学基金项目(21007050) 西安市科技局项目(HM1105) 浙江省水质科学与技术重点实验室开放基金项目
【分类号】：X524;TU991.22
【正文快照】： 目前,我国的城市湖泊、水库几乎都处于富营养或者重富营养化状态,而藻类是水体富营养化过程的重要参与者,不仅对水质、水处理过程和水处理效果影响较大[1~4],还会堵塞滤池、穿透滤床、堵塞或腐蚀管道、增加氯化消毒过程中的副产物、释放藻毒素威胁人类健康.蓝藻、绿藻[5,6]是

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