SBR系统中好氧颗粒污泥的培养及脱氮除硫研究

采用SBR反应器进行了好氧颗粒污泥的培养和脱氮除硫研究.结果表明,以厌氧颗粒污泥为种泥,通过控制运行条件,在30d内可培养出好氧颗粒污泥.好氧颗粒污泥粒径以1～2mm为主,SVI为30～40mL/g,微生物组成以短杆菌为主,外部包裹大量丝状菌.当COD和NH4+-N负荷分别保持在1.65kg/(m3.d)和0.17kg/(m3.d),硫化物负荷从0.15kg/(m3.d)逐步提高到0.90kg/(m3.d)时,好氧颗粒污泥对硫化物、COD和NH4+-N的去除率分别99%、80%和98%.在高硫化物浓度下,反应器仍然表现出良好的脱氮效果,可能是由好氧颗粒污泥的层状结构和硫化物能先于NH4+-N快速氧化的特点决定的.

Cultivation and characters of the aerobic granules for ammonium and sulfide removal in SBR system

Cultivation and characters of the aerobic granules for ammonium and sulfide removal in a sequencing batch reactor were studied.The aerobic granules were cultivated using anaerobic granular sludge as seed sludge under controlled operational conditions in 30 days.The diameter of most of the aerobic granules was about 1～2mm and the SVI was 30～40mL/g.The granule was dominated by brevibactedum,and wrapped by a large number of filamentous bacteria.When the COD and NH_4~+ -N loading were 1.65,0.17kg/(m~3·d),and the S~(2-)loading increased from 0.15 to 0.9kg/(m~3·d),the removal efficiencies of S~(2-),COD and NH_4~+-N were>99%,>80%and>98%,respectively.The reactor showed high removal capacity of NH_4~+-N under the high S~(2-) concentration,which was possible due to the layered structure of aerobic granules or the characteristics that sulfide could be fast oxidized pnor to the ammonium.