UV222/H_(2)O_(2)预氧化强化PAC混凝除藻效能及机理  

UV222/H_(2)O_(2) Pre-oxidation Enhanced PAC Coagulation for Algae Removal:Performance and Mechanism

作　　者：冯树兴 孙明亮 罗从伟[1] 王金晓 孙宇 许瑞頔 武玮 王洪香 秦玢 FENG Shu-xing;SUN Ming-liang;LUO Cong-wei;WANG Jin-xiao;SUN Yu;XU Rui-di;WU Wei;WANG Hong-xiang;QIN Bin(Resources and Environment Innovation Institute,School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Provincial Communications Planning and Design Institute Group Co.Ltd.,Jinan 250101,China)

机构地区：[1]山东建筑大学市政与环境工程学院资源与环境创新研究院,山东济南250101 [2]山东省交通规划设计院集团有限公司,山东济南250101

出　　处：《中国给水排水》2025年第3期35-42,共8页China Water & Wastewater

基　　金：国家自然科学基金资助面上项目(52270200);山东省高等学校“青创科技计划”项目(2023KJ125);山东省引进顶尖人才“一事一议”项目(0031504);济南市市校融合发展战略工程项目(JNSX2021048)。

摘　　要：对比研究了UV222/H_(2)O_(2)、UV254/H_(2)O_(2)预氧化体系强化混凝除藻的效能。结果表明,在H_(2)O_(2)投量为0.3 mmol/L、聚合氯化铝(PAC)投加量为0.8 mg/L、UV辐射剂量为1300 mJ/cm^(2)、UV222/UV254辐照时间为30 min/15 min的条件下,UV222/H_(2)O_(2)、UV254/H_(2)O_(2)预氧化强化混凝系统对藻细胞的去除率分别高达80%和87.5%,相较PAC单独处理分别提高了55%和62.5%;沉降后胞外有机物中具有芳香结构的蛋白质和可溶性微生物代谢产物显著减少。机理研究表明,UV222/H_(2)O_(2)、UV254/H_(2)O_(2)预氧化会产生大量的羟基自由基,氧化藻细胞表面的有机物,使Zeta电位升高,从而提高混凝除藻效能。此外,倒置荧光及扫描电镜分析结果显示,UV254/H_(2)O_(2)预氧化相较UV222/H_(2)O_(2)预氧化对藻细胞的破坏性更强,UV222/H_(2)O_(2)预氧化是一种更温和的强化混凝除藻方式,且无二次污染。The performance of UV222/H_(2)O_(2) and UV254/H_(2)O_(2) pre-oxidation systems on enhanced coagulation for algae removal were compared.Under the conditions of H_(2)O_(2) dosage of 0.3 mmol/L,polyaluminum chloride(PAC)dosage of 0.8 mg/L,UV irradiation dose of 1300 mJ/cm2,and UV222/UV254 irradiation time of 30 min/15 min,the removal efficiencies of algal cells by the UV222/H_(2)O_(2) and UV254/H_(2)O_(2) pre-oxidation enhanced coagulation systems were 80%and 87.5%,respectively.These values represented improvements of 55% and 62.5% over the removal efficiency achieved with PAC alone.Following the completion of the sedimentation process,there was a significant reduction in aromatic proteins and soluble microbial products within the extracellular organic matter.The mechanism study revealed that the preoxidation processes using UV222/H_(2)O_(2) and UV254/H_(2)O_(2) generated a significant amount of hydroxyl radicals.These radicals oxidized organic matters on the surface of algal cells,leading to an increase in Zeta potential,thereby enhancing the efficiency of coagulation for algae removal.Furthermore,the results from inverted fluorescence and scanning electron microscopy analysis demonstrated that UV254/H_(2)O_(2) preoxidation exhibited greater destruction towards algal cells compared to UV222/H_(2)O_(2) pre-oxidation.The latter method was found to be a gentler approach for enhanced coagulation for algae removal,effectively preventing secondary pollution.

关 键 词：UV222 过氧化氢 聚合氯化铝 混凝 藻类 

分 类 号：TU991[建筑科学—市政工程]