硫酸亚铁协同过硫酸氢钾去除铜绿微囊藻

避免消毒副产物(DBPs)形成和胞内有机物(IOMs)的释放,是解决传统工艺治理蓝藻水华潜在风险的关键.为此,开展了FeSO4协同过硫酸氢钾(PMS)高级氧化除藻研究,分别探讨了FeSO4投加量、pH及无机离子对铜绿微囊藻细胞去除效果的影响.结果 表明:当FeSO4和PMS投加量均为0.1 mmol·L-1时,藻细胞、...

Removal of Microcystis aeruginosa by synergy of ferrous sulfate and potassium hydrogen persulfate

Avoiding the formation of disinfection by-products (DBPs) and the release of intracellular organic matters (IOMs) are keys to resolve the potential risks of cyanobacterial blooms treated by traditional techniques. In this study, the advanced oxidation technology based on FeSO4 combined with potassium monopersulfate (PMS) for the treatment of Microcystis aeruginosa cells was investigated. The effects of FeSO4 dosage, pH and inorganic ions on the removal rates of Microcystis aeruginosa were studied. Results showed that when the doses of FeSO4 and PMS were controlled at 0.1 mmol·L−1, algal cell count, DOC concentration and UV254 measurements were reduced by 94.66%, 58.92% and 41.52%, respectively. The oxidation and flocculation process contributed to the algae cell removal rates were 30.50% and 69.50%, respectively. The removal rates of Microcystis aeruginosa could maintained at a high level when the pH was in the rage of 6.0~10.0, especial with mild acidic conditions. Due to competitive inhibition of ${rm{SO}}_4^{-}cdot $ by extra added HPO42− and ${rm{NO}}_3^{-} $, the removal efficiencies of algae cells began to decrease. FeSO4-PMS could effectively degrade organic matters (AOMs) with fluorescence characteristics. While the dosage of FeSO4 was below 0.1 mmol·L−1, the removal rate of algae cells and Chl-a increased with the decrease of the absolute Zeta potential. Scanning electron microscopy analysis also showed that most of algae cells had non-destructive morphology and structure after coordinated oxidation, which indicated this process effectively avoiding the release of IOMs. The above results can provide theoretical foundation for FeSO4-PMS treating cyanobacteria blooms in eutrophic water bodies.