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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.
In allusion to the situation that algae can not be effectively removed in the process of conventional water treatment, the algae coagulation process is enhanced by UV radiation.The results show that with the increase of ultraviolet irradiation time, the removal of algal cells and turbidity after coagulation Which showed the trend of increasing firstly and then decreasing and reaching the maximum value at 50 min irradiation.When the dosage of PAC (polyaluminum chloride) was 5 mg · L -1, the algal removal rate and turbidity removal rate Reaching the maximum, respectively 20.1% and 18% higher than blank samples.However, the change of coagulation effect of ultraviolet radiation in the range of 6 ~ 9 was small.The solution pH = 8, UV irradiation for 50 min, The rate of algae and turbidity reached 93.5% and 90.6%, respectively.At this point, algae cells had the largest Zeta potential and released algae mucus, which was conducive to coagulation.When the UV irradiation for more than 60 min, the cell membrane ruptured, Exudation within the organic matter, making the concentration of organic matter in the solution increased sharply, Zeta potential began to decline, is not conducive to the follow-up coagulation.