紫外/过硫酸盐预氧化强化混凝同步除藻和三氯酚

UV/Persulfate Pre-oxidation Enhanced Coagulation for Simultaneous Removal of Algae and Trichlorophenol

以铜绿微囊藻和三氯酚(TCP)为研究对象,探究了紫外/过硫酸盐(UV/PS)预氧化强化混凝技术同步除藻和TCP的效果。结果表明,经过UV/PS预氧化强化混凝沉淀以后,对OD680、Chl-a、浊度和TCP的去除率分别提高了66.2%、67.4%、51.7%和95.6%;UV/PS预氧化阶段最佳PS投加量为100 mg/L,最佳预氧化时间为10 min。机理分析发现,UV/PS预氧化可以破坏细胞的完整性,使藻细胞释放胞内有机物(IOM),并且能够进一步破坏核酸;同时,UV/PS预氧化还可以降低藻细胞表面的Zeta电位、改变细胞粒径,进而强化混凝除藻。

The effect of UV/persulfate(UV/PS) pre-oxidation enhanced coagulation process on simultaneous removal of Microcystis aeruginosa and trichlorophenol(TCP) was investigated. After UV/PS pre-oxidation enhanced coagulation and precipitation, the removal rate of OD680, Chl-a, turbidity and TCP were increased by 66.2%, 67.4%, 51.7% and 95.6%. The optimal dosage of PS in the UV/PS pre-oxidation stage was 100 mg/L, and the optimal pre-oxidation time was 10 min. UV/PS pre-oxidation damaged the cell integrity which resulted in the release of intracellular organic matter(IOM) from algae,thus further destroyed the nucleic acid. In addition, UV/PS pre-oxidation also reduced the Zeta potential on the surface of algal cells, changed the cell size, and enhanced the removal of algal by coagulation.