磁性硅球对SBR活性污泥脱氮除磷性能的影响  

Impact of Fe3O4@SiO2 on the performances of nitrogen and phosphorus removal in a SBR

作　　者：管蕾[1] 信欣[1] 刘琴[1] 杨豪 刘洁[1] 罗彤 樊馨宇 袁佳颖 GUAN Lei;XIN Xin;LIU Qin;YANG Hao;LIU Jie;LUO Tong;FAN Xinyu;YUAN Jiaying(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学资源环境学院,成都610225

出　　处：《环境工程学报》2020年第3期588-596,共9页Chinese Journal of Environmental Engineering

基　　金：四川省教育厅科研项目(17ZA0067);成都信息工程大学中青年学术带头人科研基金资助项目(J201614);2019年大学生创新创业训练计划项目(S201910621026)。

摘　　要：为研究磁性硅球(Fe3O4@SiO2)对序批式活性污泥反应器(SBR)污水处理系统中脱氮除磷性能的影响,建立了3个相同的SBR(编号依次为1号、2号和3号),在2号和3号反应器中分别投加0.5 g·L^-1的纳米Fe3O4和Fe3O4@SiO2,1号反应器为不投加任何磁性材料的对照组。结果表明:Fe3O4@SiO2对SBR中的污泥性能有显著的影响,3号反应器在运行20 d时,反应器内活性污泥结构完整,饱满密实,污泥粒径多集中分布在0.3~1.0 mm,颗粒化现象明显,而1号反应器无明显颗粒污泥,2号反应器虽能看到有少部分的颗粒污泥,但分布不均匀;Fe3O4@SiO2对污泥胞外蛋白(PN)、胞外多糖(PS)的含量有促进作用,并能改善污泥的沉降性能,第70天时,3号反应器内PN和PS含量分别为318.89 mg·g^-1和28.51 mg·g^-1,污泥沉降指数(SVI)为35.22 mL·g^-1,性能优于1号和2号反应器;在除污方面,2号和3号反应器对污水总氮(TN)和总磷(TP)去除率比1号反应器分别提升了10.80%、15.20%和9.40%、12.40%,3号反应器表现出最高的脱氮除磷性能;此外,在典型周期内,3号反应器对氮素及磷的去除速率明显高于1号反应器,在240 min内,1号和3号反应器对TN去除速率分别为4.56 mg·(L·h)^-1和5.84 mg·(L·h)^-1,对TP去除速率分别为0.44 mg·(L·h)^-1和0.51 mg·(L·h)^-1。由此可见,经SiO2包覆后所制备的Fe3O4@SiO2,提高了其在水体的分散性,增大了与污泥的接触程度,极大促进了污泥经磁聚、吸附作用富集到其表面形成颗粒污泥,并利于脱氮除磷等微生物截留和附着,提高活性污泥反应系统的脱氮除磷效果和去除速率。以上结果可为进一步探索磁性纳米材料对SBR活性污泥脱氮除磷性能影响提供参考。The identical three sequencing batch reactors(SBRs)were set up in order to illuminate the effects of Fe3 O4@SiO2 on the performances and kinetics of nitrogen and phosphorus removal in the sequencing batch reactor(SBR).0.5 g·L^-1 nano-Fe3 O4 and 0.5 g·L^-1 nano-Fe3 O4@SiO2 were added to SBR 2 and SBR 3,respectively,and compared with the control group of SBR 1 without addition of magnetic material.The results showed that nano-Fe3 O4@SiO2 had significant influence on the sludge property in SBR.After 20 d running,the sludge in SBR 3 presented complete structure,fullness and compactness,and its particle size was mainly distributed in 0.3~1.0 mm,obvious granulation phenomenon occurred.However,no obvious granular sludge appeared in SBR 1,a few sludge granules with non-uniform distribution formed in SBR 2.Moreover,Fe3 O4@SiO2 could promote the secretion of exopolysaccharides(EPS)and improve sludge sedimentation performance.On the 70 th day,the contents of PN and PS in SBR 3 were 318.89 mg·g^-1 and 28.51 mg·g^-1,respectively,and sludge volume index(SVI)was 35.22 mL·g^-1,and the sludge performance was better than that of SBR 1 and SBR 2.In the aspect of pollutants removal,compared with reactor 1,the removal efficiencies of total nitrogen(TN)and total phosphorus(TP)in SBR 2 and SBR 3 increased by 10.80% and 15.20%,9.40% and 12.40%,respectively,and SBR 3 showed the highest performance on nitrogen and phosphorus removal.In addition,the removal rates of nitrogen and phosphorus in SBR 3 were significantly higher than those in SBR during the typical circle;during 240 min,the TN removal rates in SBR 1 and SBR 3 were 4.56 mg·(L·h)^-1 and5.84 mg·(L·h)^-1,respectively,the TP removal rates in SBR 1 and SBR 3 were 0.44 mg·(L·h)^-1,0.51 mg·(L·h)^-1,respectively.Therefore,the silica-based magnetic particles(nano-Fe3 O4@SiO2)could improve its dispersion in water and contact with sludge,then significantly promoted the formation of granular sludge through enrichment on the sludge surface by magnetic aggregation,adsorption func

关 键 词：磁性硅球 序批式活性污泥法 污泥沉降性能 脱氮除磷 

分 类 号：X703.1[环境科学与工程—环境工程]