摘要
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FeSO_(4)协同过硫酸氢钾(PMS)高级氧化除藻研究,分别探讨了FeSO_(4)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FeSO_(4)和PMS投加量均为0.1 mmol·L^(-1)时,藻细胞、DOC和UV254的去除率分别为94.66%、58.92%和41.52%,藻细胞去除的氧化、絮凝的贡献率分别为30.50%和69.50%;当pH为6.0~10.0时,藻细胞去除率均保持较高水平,其中弱酸环境有利于提高藻细胞的去除;外加的HPO_(4)^(2-)和NO_(3)^(-)对SO_(4)^(-·)的竞争抑制,可导致藻细胞去除率降低;FeSO_(4)-PMS可以有效去除含有荧光特性的藻源性有机质(AOMs);当FeSO_(4)投加量低于0.1 mmol·L^(-1)时,藻细胞、叶绿素a去除率随着Zeta电位净值降低而升高。扫描电镜表征结果表明,协同氧化后大多数藻细胞形态结构完整,从而可有效避免IOMs释放。以上研究结果可为FeSO_(4)-PMS治理富营养化水体中蓝藻水华提供参考。
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 FeSO_(4) combined with potassium monopersulfate(PMS)for the treatment of Microcystis aeruginosa cells was investigated.The effects of FeSO_(4) dosage,pH and inorganic ions on the removal rates of Microcystis aeruginosa were studied.Results showed that when the doses of FeSO_(4) and PMS were controlled at 0.1 mmol·L^(-1),algal cell count,DOC concentration and UV254measurements 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 ofSO_(4)^(-)·by extra added HPO_(4)^(2-) and NO_(3)^(-),the removal efficiencies of algae cells began to decrease.FeSO_(4)-PMS could effectively degrade organic matters(AOMs)with fluorescence characteristics.While the dosage of FeSO_(4) 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 FeSO_(4)-PMS treating cyanobacteria blooms in eutrophic water bodies.
作者
王磊
魏群
马湘蒙
陈记玲
甘钰华
刘璠
姚金洁
WANG Lei;WEI Qun;MA Xiangmeng;CHEN Jiling;GAN Yuhua;LIU Fan;YAO Jinjie(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第11期3572-3580,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51769003)
广西重点研发计划(桂科AB1850006)。
关键词
铜绿微囊藻
硫酸亚铁
过硫酸氢钾
高级氧化
去除效果
Microcystis aeruginosa
ferrous sulfate
potassium monopersulfate
advanced oxidation
removal efficiency
