水处理剂投加量对水中微囊藻毒素去除效果影响

目的:研究水处理剂投加量对去除水中微囊藻毒素的影响,探讨最佳投加剂量.方法:采用烧杯试验,研究不同工艺、不同投加量对微囊藻毒素的去除效果;采用酶联免疫法检测藻毒素.结果:混凝沉淀工艺对微囊藻毒素去除率最低为4.3%,最高为29.7%;氧化处理工艺对微囊藻毒素去除率最低为13.0%,最高为92.0%,随着氧化剂投加剂量的增加,微囊藻毒素的去除率大幅度提高,臭氧、二氧化氯、高锰酸钾的最高去除率分别为92.0%、87.0%、78.3%,91.7%的水样经处理后微囊藻毒素浓度达到GB5749规定;粉末活性炭吸附工艺对微囊藻毒素去除率最低为4.0%,最高为40.0%,随着投加量增加,藻毒素去除率提高.水处理剂的最佳投加量分别为:聚合氯化铝(液体)3.0 mg/L,聚合氯化铝(固体)1.0 mg/L,聚合硫酸铁10.0 mg/L,聚丙烯酰胺0.1 mg/L,高锰酸钾1.0 mg/L,二氧化氯6.0 mg/L,臭氧5.6 mg/L,粉末活性炭4.0 mg/L.结论:单纯增加混凝(絮凝)剂的投加量不能提高藻毒素的去除效果,增加臭氧(O3)、二氧化氯(ClO2)、高锰酸钾(KMnO4)等氧化剂和粉末活性炭等吸附剂的投加量,可提高对藻毒素的去除效果.

Efficiency of Microcystin removing in water influenced by the dosage of water treatment reagents

Objective:To study the influence on the efficiency of Microcystin removing in water caused by the dosage of water treatment reagents and explore the best dosage of water treatment reagents.Methods:Beaker test was adopted.Microcystin removel test was studied in different procedure of water treatment and reagent dosage.A commercial enzyme-linked immunosorbent assay was conducted in microcystin testing.Results:Microcystin removal efficiency in coagulating sedimentation is from 4.3% to 29.7%.Oxidation treatment can remove microcystin from 13.0% to 92.0%.When the dosage of reagents increased,the efficiency of Microcystin removing is improved.The maximum removal rate of microcystin is 92.0% for Ozone(O3),87.0% for chlorine dioxide(ClO2),and 78.3% for potassium permanganate(KMnO4).91.7% water samples accord with the standard of GB5749 after oxidation procedure.Removal rate is from 4.0% to 40.0% for adsorption procedure via powdered activated carbon(PAC),and the removal rate raised when the dosage increased.The optimal dosage are as follows: 3.0 mg/L for polyaluminium chloride(PAC)(liquid),1.0 mg/L for polyaluminium chloride(PAC)(solid),10.0 mg/L for Polyferric sulphate(PFS),0.1 mg/L for polyacrylamide(PAM),1.0 mg/L for potassium permanganate(KMnO4),6.0 mg/L for chlorine dioxide(ClO2),5.6 mg/L for Ozone(O3),and 4.0 mg/L for powdered activated carbon(PAC).Conclusion:Microcystin removal rate could not be raised by increasing the amount of coagulant or flocculant only.The removal rate could be improved via increasing oxidant dosage,for example,Ozone(O3),potassium permanganate(KMnO4),and chlorine dioxide(ClO2).Sorbent is similar to oxidant,for example,powdered activated carbon(PAC).