【摘要】 研究了浸没式膜生物反应器(SMBR)对城市污水中不同分子质量有机物的去除特性,探讨了不同工艺参数对氮去除效果的影响。在连续进水、间歇曝气、间歇出水的运行条件下,SMBR对城市污水中有机物和氨氮的去除效果较好。当HRT为4 h、曝气/停曝时间为90 min/30min时,SMBR对小分子质量有机物(<4 ku)的去除率为44%,对中等分子质量有机物(4~30 ku)的去除率>90%,高分子质量有机物(>30 ku)因可被微滤膜高效截留而在反应器中发生一定程度的积累。影响脱氮效果的因素包括DO、HRT、曝气/停曝时间等。当DO为3.2 mg/L时,总氮可通过同步硝化反硝化作用被去除。当曝气/停曝时间周期为120 min、HRT为4 h时,脱氮较适宜的曝气/停曝时间为90 min/30 min。更多还原

【Abstract】 The removal characteristics of organics with different molecular weight from municipal wastewater by submerged membrane bioreactor(SMBR) were studied,and the effect of different operating parameters on nitrogen removal was discussed.Under the operation condition of continuous inflow and intermittent aeration and outflow,the SMBR removes organic matter and ammonia nitrogen from municipal wastewater efficiently.When HRT is 4 hours and aeration time and non-aeration time are 90 min and 30 min,the removal rate of organics with low molecular weight(<4 ku) is 44%,while the removal rate of organics with medium molecular weight(4 to 30 ku) is more than 90%.The organics with high molecular weight(>30 ku) are accumulated in the bioreactor,because of being effectively intercepted by the micro-filtration membrane.Dissolved oxygen(DO) concentration,hydraulic retention time(HRT),aeration time and non-aeration time are the influence factors of nitrogen removal.When DO is 3.2 mg/L,the total nitrogen can be removed by simultaneous nitrification and denitrification.When HRT is 4 h,the suitable aeration time and non-aeration time for nitrogen removal are 90 min and 30 min.更多还原