酸化联合钢渣催化过硫酸盐预处理对污泥脱水性能的影响研究

Effect of pretreatment though acidification combined with persulfate catalyzed by steel slag on dewaterability of sludge

采用酸化联合钢渣催化过硫酸盐(PS)预处理技术对剩余活性污泥进行调理,对污泥脱水性能进行研究.通过单因素实验确定了污泥的最佳预处理条件:在温度25℃,pH 3,反应时间30min,钢渣及PS的投加量分别为100,280mg/g TS时,污泥比阻与泥饼含水率分别从原泥的9.23×10^(12)m/kg和85%降至1.89×10^(12)m/kg和77%.傅里叶红外光谱、三维荧光光谱、多糖、蛋白质及自由基淬灭实验的测定与分析阐明,钢渣催化PS预处理促进污泥脱水性能提高的作用机理:钢渣催化PS产生的SO_(4)^(−)·和·OH可以破解污泥胞外聚合物及生物细胞结构,从而降低亲水性官能团的含量并促进结合水释放.

The acidification combined with steel slag-catalytic persulfate(PS)pretreatment technology was applied to sludge conditioning and the sludge dewatering performance was investigated by the single-factor experiment.The optimal pretreatment conditions for sludge were temperature of 25°C,pH 3,mixing time of 30min,and dosing levels of 100mg/g TS and 280mg/g TS for steel slag and PS,respectively,the sludge specific resistance and sludge cake water content decreased from 9.23×10^(12)m/kg and 85%of the raw sludge to 1.89×10^(12)m/kg and 77%respectively.Fourier transform infrared spectroscopy,three-dimensional fluorescence spectroscopy,polysaccharide,protein and free radicals quenching experiments were characterizated mechanism for steel slag-catalytic PS pretreatment promoting sludge dewatering performance:The SO_(4)^(−)·and·OH generated by slag-catalytic PS can destroy the sludge extracellular polymeric substances and biological cell structure,thereby reducing the content of hydrophilic functional groups and promoting the release of bound water.