低溶解氧下NaCl和Na_2SO_4盐度对SBR脱氮效果和污泥沉降性的影响  

Effect of NaCl and Na_2SO_4 Salinity on Denitrification Efficiency and Sludge Settleability of SBR at Low Dissolved Oxygen

作　　者：张兰河[1,2] 王山山[1] 郭静波[3] 

机构地区：[1]东北电力大学化学工程学院,吉林吉林132012 [2]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [3]东北电力大学建筑工程学院,吉林吉林132012

出　　处：《北京工业大学学报》2014年第1期74-79,共6页Journal of Beijing University of Technology

基　　金：城市水资源与水环境国家重点实验室开放基金资助项目(QA201013);吉林省科技发展计划项目-社会发展重点项目(20110405);吉林省教育厅"十二五"科学技术研究资助项目(吉教科合字[2012]第95号)

摘　　要：采用序批式生物反应器(SBR)处理含盐废水,在醋酸钠作为碳源的条件下,考察Na2SO4和NaCl盐度((ρ(Na2SO4))和ρ(NaCl))对脱氮效果和污泥沉降性能的影响.结果表明:低溶解氧(0.3 mg/L)下通过逐渐提高盐度,当ρ(Na2SO4)和ρ(NaCl)分别低于18和14 g/L时,氨氮去除率(η(NH+4-N))均高于80%,总氮去除率(η(TN-N))均高于70%.为了进一步探讨盐度冲击对脱氮效果的影响,一次性投加14 g/L的Na2SO4和NaCl废水,SBR反应器运行初期,η(NH+4-N)和η(TN-N)均低于55%,随着运行时间的增加,η(NH+4-N)和η(TN-N)分别提高至80%和70%.同时,盐度能影响活性污泥的沉降性,当盐度为0 g/L时,ρ(EPS)为680 mg/L,SVI为100 mL/g;当ρ(Na2SO4)为14 g/L时,活性污泥ρ(EPS)达到950 mg/L,SVI为75 mL/g;当ρ(NaCl)为14 g/L时,活性污泥ρ(EPS)达到1 200 mg/L,SVI为65 mL/g.NaCl和Na2SO4能提高SBR活性污泥的沉降性能.A continuous experiment was carried out using SBR process to treat wastewater containing saline and effects of NaCl and NazSO4 salinity （ρ（NazSO4） and ρ（NaCl）） on the denitrification and activated sludge settleability were investigated at 0.3 mg/L of low dissolved oxygen when sodium acetate was used as carbon source. The results showed that the salinity increased gradually and η（ NH4 -N） and η（TN-N） were higher than 80% and 70% when ρ（ NazSO4） andp（NaCl） were lower than 14g/L and 18 g/L, respectively. 14 g/L ofρ（ Na2SO4 ） and ρ（NaCl） wastewater was added one-time to investigate the effect of salinity shock on the denitrification effciency. η（ NH4 -N） and η（TN-N） were lower than 55% at initial operation, and η（NH4＋-N） and η（TN-N） were increased to 80% and 70%, respectively, with the operation time increasing. Furthermore, the sludge settleability was influenced bythe salinity. The total p（EPS） and SVI were 680 mg/L and 100 mL/g, respectively, when the salinity was 0 g/L. ρ（EPS） and SVI were 950 mg/L and 75 mL/g, respectively, when ρ（ Na2SO4） was 14 g/L. ρ（EPS） and SVI were 1 200 mg/L and 65 mL/g, respectively, when ρ（NaCl） was 14 g/L. NaCl and Na2SO4 could increase the settleability of sludge.

关 键 词：盐度 脱氮 沉降性 胞外聚合物 

分 类 号：X703.1[环境科学与工程—环境工程]