H2O_(2)对SBR脱氮效率和污泥性能的影响  

Effect of H_(2)O_(2)on nitrogen removal and sludge properties in SBR

作　　者：张兰河[1] 赖青燚 王铁铮 关潇卓 张明爽[1] 程欣[1] 徐小惠[1] 贾艳萍[1] ZHANG Lanhe;LAI Qingyi;WANG Tiezheng;GUAN Xiaozhuo;ZHANG Mingshuang;CHENG Xin;XU Xiaohui;JIA Yanping(School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China;Jilin Power Supply Company,State Grid Jilin Electric Power Supply Company,Jilin 132001,Jilin,China)

机构地区：[1]东北电力大学化学工程学院,吉林省吉林市132012 [2]国网吉林省电力有限公司吉林供电公司,吉林省吉林市132001

出　　处：《化工学报》2023年第5期2186-2196,共11页CIESC Journal

基　　金：吉林省科技发展计划项目(20230203168SF)。

摘　　要：双氧水(H_(2)O_(2))作为氧化剂,被广泛用于制药、纺织、化学品合成等企业,这些企业产生的废水进入污水生物处理系统,影响微生物活性和污水处理效果。考察H_(2)O_(2)对污染物去除率和过氧化氢酶活性的影响,分析胞外聚合物组成和污泥性质的变化,探索H_(2)O_(2)在污泥系统中的分解途径及其对污泥的作用机理。结果表明:低浓度H_(2)O_(2)(<90 mg/L)分解产生的·OH和·O_(2)^(-)具有协同作用,提高了COD和TN去除率,污泥表面变粗糙,絮凝颗粒增大,促进污泥絮凝,其中·OH贡献度大于·O_(2)^(-)。高浓度H_(2)O_(2)(>90 mg/L)对TN的去除产生抑制作用,酶活性、污泥絮凝性和胞外聚合物浓度降低。当H_(2)O_(2)浓度为90 mg/L时,COD和TN去除率最高,酶活性最高,因此,通过调控H_(2)O_(2)浓度可实现提高污染物去除率和污泥絮凝性的目的。Hydrogen peroxide(H_(2)O_(2)),as a green oxidant,is widely used in pharmaceuticals,textile,chemical synthesis and other enterprises.The wastewater produced from these enterprises enters the sewage biological treatment system,which affects biological activity and the efficiency of sewage treatment.In the study,the effect of H_(2)O_(2)on the removal efficiencies of pollutants and catalase activity in the SBR were investigated.The changes of extracellular polymers(EPS)compositions and sludge properties were analyzed,and the decomposition pathway of H_(2)O_(2)and its influence mechanisms on the activated sludge were explored.The results showed that·OH and·O_(2)^(-)produced by low concentration of H_(2)O_(2)(<90 mg/L)decomposition had a synergistic effect,and removal efficiencies of COD and TN were improved.The sludge surface became rougher,the flocculation particles were larger and sludge flocculation was improved.The contribution of·OH was higher than that of·O_(2)^(-).However,high concentration of H_(2)O_(2)(>90 mg/L)inhibited the removal of TN,and catalase activity,sludge flocculation and EPS concentration all reduced.When the concentration of H_(2)O_(2)is 90 mg/L,the removal rate of COD and TN is the highest,and the enzyme activity is the highest.Therefore,the purpose of improving the removal rate of pollutants and sludge flocculation can be achieved by adjusting the concentration of H_(2)O_(2).

关 键 词：废水 H_(2)O_(2) 生物反应器 酶 污泥性质 自由基 

分 类 号：X703[环境科学与工程—环境工程]