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Effects of potassium permanganate pre-oxidation on membrane fouling and Mn(Ⅶ) deposition during the treatment of algae-laden water by ultrafiltration

Authors： Qu Fang Shu, Yang Zhi Meng, Zhou Hong, Rong Hong Wei, He Jun Guo, Yu Hua Rong *

Units： Department of Municipal Engineer, College of Civil Engineer, Guangzhou University, Guangzhou 51006, China

KeyWords： potassium permanganate, pre-oxidation, algae-laden water ultrafiltration membrane pollution, manganese deposition

ClassificationCode：X524

year,volume(issue):pagination： 2020,40(6):29-36

Abstract：

Ultrafiltration technology can efficiently remove algae, but membrane pollution is still the bottleneck of technical application. Permanganate and compound agents are often used in the enhanced coagulation technology in the algae-laden period of urban water plants. Therefore, whether it has the effect of inhibiting the algae membrane pollution is worthy of attention. In this paper, the effects of KMnO4 pretreatment on the ultrafiltration membrane pollution of the algae-laden water are studied. The results show that the removal capacity of algae-derived organics by ultrafiltration after KMnO4 pretreatment (29-41%) is lower than that of ultrafiltration alone (41%), which only improves the removal of fluorescent components; But excessive addition will induce EOM release, resulting in an increase in humic-acid content; KMnO4 pre-oxidation has a slight mitigating effect on ultrafiltration membrane pollution, even when 50μM is added, the terminal specific flux is only increased from 0.14 to 0.19, but it will increase the hydraulic irreversible membrane pollution during the filtration process; MnO2 particles formed by KMnO4 pre-oxidation are mainly deposited in the filter cake layer, which can be effectively removed by physical or chemical cleaning. Therefore, when using KMnO4 pre-oxidation and UF technology to treat algae-laden water, the physical strength should be properly strengthened and the cleaning frequency should be increased to suppress the growth of hydraulic irreversible membrane pollution and the deposition of MnO2 particles.

Funds：

国家自然科学基金资助项目（51878211）；广东省自然科学基金(2019A1515012232)

AuthorIntro：

瞿芳术（1984.09），男，福建宁德市人，副教授，主要研究方向为。qufangshu@163.com

Reference：

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