期刊
CHEMICAL ENGINEERING JOURNAL
卷 445, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136689
关键词
Water purification; Coagulation; Peroxymonosulfate; Algae removal; Cyanotoxin abatement; Disinfection by-products
资金
- National Natural Science Foundation of China [21806193, 22176225, 51808156]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515012036, 2019A1515011664]
- Fundamental Research Funds for the Cen-tral Universities [19lgpy160, 201gzd22]
This study investigates the use of peroxymonosulfate (PMS) to enhance Fe(III) coagulation for the removal of Microcystis aeruginosa in water treatment. Results show that the presence of PMS promotes the formation of larger floc, leading to improved removal of algae and turbidity compared to conventional Fe(III) coagulation. The PMS-enhanced Fe(III) coagulation process also effectively degrades Microcystin-LR, a cyanotoxin, and reduces the formation of disinfection byproducts (DBPs) and their associated toxicity during subsequent chlorination.
Algae blooms can clog filtration tank, release toxic cyanotoxin and produce undesirable disinfection byproducts (DBPs) in post-chlorination, which brings challenges to conventional water treatment processes. In this study, peroxymonosulfate (PMS) was tested for its ability to improve Fe(III) coagulation of Microcystis aeruginosa in water treatment. Compared with conventional Fe(III) coagulation, the presence of PMS resulted in the formation of larger floc and thus better algae and turbidity removal. The removal of algae by PMS-enhanced Fe(III) coagulation (PMS-Fe(III)) process reached 97.5% at 1 mM PMS, which was 1.5 times higher than that by Fe(III) coagulation alone. The oxidization of surface-adsorbed extracellular organic matter destabilized the algal cells and enhanced their coagulation without greatly damaging the cells' integrity. Simultaneously, about 80% of Microcystin-LR, a cyanotoxin, was degraded in the enhanced process. Moreover, the formation of DBPs and their associated toxicity during the subsequent chlorination were decreased by 49.2% and 13.6%, respectively. The production of trihalomethanes, haloacetic acids and haloacetronitriles was particularly abated. SO4 & BULL;-and HO & BULL;, which were formed from PMS activation through redox cycling of Fe mediated by the existing natural organic matter, were mainly responsible for algae removal. The results indicate that supplementing Fe(III) coagulation with PMS is a promising option for treating water during algal blooms.
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