不同曝气剪切条件下活性污泥絮体特性研究  

Activated sudge floc properties under different aeration modes

作　　者：郭昌梓[1] 王凯[1] 苏朋娟 刘富宇[1] 王旭[1] 彭党聪[3] 金鹏康[3] 

机构地区：[1]陕西科技大学资源与环境学院,陕西西安710021 [2]西安盛赛尔电子有限公司,陕西西安710075 [3]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《陕西科技大学学报（自然科学版）》2014年第5期20-26,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家重大科技专项项目(2011ZX07302-001-06);陕西省教育厅科研计划项目(14JK1096);陕西科技大学博士科研启动基金项目(BJ13-08);陕西省大学生创新创业训练计划项目(20131067)

摘　　要：采用轮流搅拌-曝气SBR系统模拟两种不同曝气方式(分点曝气和分段曝气),研究其形成的污泥絮体特性.结果表明:在相同的运行条件下,分点曝气形成的污泥絮体尺度大、沉降性能好,两者的SVI平均值分别为133mL/g和202mL/g,平均粒径分别为74.26μm和53.46μm,而且分点曝气中拥有更多的大颗粒絮体;分点曝气形成的污泥絮体稳定性优于分段曝气,在连续曝气条件下,两种污泥絮体均受到剪切破碎,不仅初始粒子被剥离,而且絮体也被打碎变小,但分段曝气被破碎的程度更大;分点曝气和分段曝气所形成的污泥絮体的EPS含量分别为31.21mg/gVSS和21.6mg/gVSS,且前者EPS中的多糖、蛋白质和DNA组分均比后者多,两者EPS的主要组分以蛋白质为主.两种污泥经连续曝气3h后,EPS皆增大,且多糖含量增加较多;分点曝气和分段曝气形成的污泥比阻分别为5.21×1012 m/kg和7.94×1012 m/kg,前者污泥的脱水性能较好.经连续曝气3h后,两种污泥的比阻明显增大,脱水性能变差.The sequencing batch reactors（SBRs）with alternate aerating and stirring were used to investigate the sludge properties under the two different aeration modes.Experimental results indicated that the floc size for point aeration was bigger than step aeration under the same anoxic and oxic zones proportion,where the average floc diameter was 74.26μm and 53.46μm.The sludge settleability in point aeration was better than step aeration.The average SVI of the two operating condition was 133mL/g and 202mL/g,respectively.The sludge floc has better strength and stability for point aeration than step aeration.After continuous aeration,both erosion of primary particles and splitting of floc into smaller ones occurred for the two kinds of sludge.The sludge floc from step aeration was broken to a greater extent.EPS of sludge in point aeration and step aeration was 31.21mg/gVSS and 21.6mg/gVSS,respectively.Polysaccharide,protein and DNA of the former were bigger than the latter.After 3hof continuous aeration,EPS in the two kinds of sludge increased,especially polysaccharide.The SRF of sludge from point aeration and step aeration was 5.21×10^12 m/kg and 7.94×10^12 m/kg.The former has better dewatering ability.After 3hof continuous aeration,SRF in the two kinds of sludge increased remarkably,and the dewater performance went down.

关 键 词：分点曝气 分段曝气 活性污泥 絮体 

分 类 号：X703.1[环境科学与工程—环境工程]