.334 北京科技大学学报 2006年第4期 给水排水，2004,20(6)：18 Biofilm abrasion by particle collisions in airlift reactors.Water [7]潘涛，邬扬善，王绍堂·三相生物流化床中生物膜厚度研 Sci Technol,1997,36(1):221 究.中国给水排水，1999,15(5)：51 [9]van Loosdrecht M C M.Eikelboom D.Gjaltema A,et al. [8]Gjaltema A.Vinke J L.van Loosdrecht M C M.et al. Biofilm structures.Water Sci Technol.1995.32(8)35 Cultivation of biofilms in an inner loop three phase fluidized bed HUANG Qinghua,WANG Huajun,CAO Congrong?) 1)Civil and Environmental Engineering School.University of Science and Technology Beijing.Beijing 100083.China 2)Beijing Environment Protection Scientific Research Institute,Beijing 100037.China ABSTRACI This paper studied the situation of cultivating the biofilms with two different flow modes in an inner loop three phase fluidized bed.The results showed that the diameter of the biofilm formed in a se- quencing batch reactor(SBR)could increase to about 200~250/m,and that formed in a continuance reac- tor could arrive at 100/m.The former biofilm is smooth and compact,but the later has a higher activity. A lower initial loading rate makes for suspension membrane,and in the successive process,the loading rate can not be excessively low.Otherwise filamentous colonies expand because of the low loading rate.The biomass density of active sludge with SBR mode could increase to 9.65gL 92.7%of which is attach- ment biofilm,and the loading rate of COD with continuance mode could arrive at 11.45kgmd. KEY WORDS inner loop:three phase fluidized bed;biofilm cultivation给水排水‚2004‚20（6）：18 ［7］ 潘涛‚邬扬善‚王绍堂．三相生物流化床中生物膜厚度研 究．中国给水排水‚1999‚15（5）：51 ［8］ Gjaltema A‚Vinke J L‚van Loosdrecht M C M‚et al． Biofilm abrasion by particle collisions in airlift reactors．Water Sci Technol‚1997‚36（1）：221 ［9］ van Loosdrecht M C M‚Eikelboom D‚Gjaltema A‚et al． Biofilm structures．Water Sci Technol‚1995‚32（8）35 Cultivation of biofilms in an inner loop three-phase fluidized bed HUA NG Qinghua 1）‚WA NG Huajun 1）‚CAO Congrong 2） 1） Civil and Environmental Engineering School‚University of Science and Technology Beijing‚Beijing100083‚China 2） Beijing Environment Protection Scientific Research Institute‚Beijing100037‚China ABSTRACT This paper studied the situation of cultivating the biofilms with two different flow modes in an inner loop three-phase fluidized bed．The results showed that the diameter of the biofilm formed in a se￾quencing batch reactor （SBR） could increase to about200～250μm‚and that formed in a continuance reac￾tor could arrive at 100μm．The former biofilm is smooth and compact‚but the later has a higher activity． A lower initial loading rate makes for suspension membrane‚and in the successive process‚the loading rate can not be excessively low．Otherwise filamentous colonies expand because of the low loading rate．The biomass density of active sludge with SBR mode could increase to9∙65g·L －1‚92∙7％ of which is attach￾ment biofilm‚and the loading rate of COD with continuance mode could arrive at 11∙45kg·m －3·d －1． KEY WORDS inner loop；three-phase fluidized bed；biofilm cultivation ·334· 北 京 科 技 大 学 学 报 2006年第4期