摘要
为了研究溶解氧变化对生物滤柱中氨氮、铁、锰去除效果的影响,将进水溶解氧从约10.5mg/L逐步降到7mg/L,本文考察了氨氮、铁、锰的变化规律。结果表明:当溶解氧为约10.5mg/L时,出水氨氮、总铁、锰分别为0.050mg/L、0.065mg/L、0.022mg/L,氨氮、铁、锰分别主要在滤层的0~1.2m、0~0.4m、0~1.2m去除。当溶解氧降到约9mg/L、8mg/L、7mg/L时,出水总铁均低于0.1mg/L;出水锰先明显升高,后又降到了0.05mg/L以下;出水氨氮分别升高到0.17mg/L、0.41mg/L、0.61mg/L。溶解氧不足时,铁主要在溶解氧充足的上部滤层去除;锰氧化菌优先利用溶解氧氧化二价锰,并且锰的氧化速率没有明显降低;氨氮的氧化速率明显降低。生物滤柱可以在较低溶解氧条件下运行,从而降低运行成本。
In order to study the influence of dissolved oxygen(DO)on the removal efficiency in biofilter,as well as the variation rule of ammonia,iron and manganese,the DO was gradually reduced from about 10.5mg/L to 7mg/L.The results showed that when DO was about 10.5mg/L,the concentration of ammonia,total iron and manganese in effluent were 0.050mg/L,0.065mg/L and 0.022mg/L,respectively,and ammonia,iron and manganese were mainly removed at 0-1.2m,0-0.4m and 0-1.2m of the filter layer,respectively.When DO was reduced to about 9mg/L,8mg/L and 7mg/L,total iron in effluent was lower than 0.1mg/L;manganese in effluent increased significantly at first,then decreased to below 0.05mg/L;and ammonia in effluent increased to 0.17mg/L,0.41mg/L and 0.61mg/L,respectively.When DO was insufficient,iron was mainly removed in the upper filter layer where DO was sufficient;DO was preferentially used by manganese oxidizing bacteria to oxidize manganese dioxide,and the oxidation rate of manganese was not significantly reduced;the oxidation rate of ammonia was significantly reduced.Thus,biofilter could be operated under lower DO conditions to reduce the operation cost.
作者
能子礼超
胡金朝
邓雪梅
曾景江
钟林
余茜茹
江道澳
NENGZI Lichao;HU Jinzhao;DENG Xuemei;ZENG Jingjiang;ZHONG Lin;YU Qianru;JIANG Dao’ao(College of Resources and Environment,Xichang University,Xichang 615000,Sichuan,China;Academy of Environmental and Economics Sciences,Xichang University,Xichang 615000,Sichuan,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2020年第7期2900-2906,共7页
Chemical Industry and Engineering Progress
基金
凉山州技术研究开发与推广应用(18YYJS0071)。
关键词
生物滤柱
氨氮、铁、锰
溶解氧
地下水
biofilter
ammonia
iron and manganese
dissolved oxygen
groundwater
