内循环三相流化床的生物膜的培养

Cultivation of biofilms in an inner loop three-phase fluidized bed

研究了内循环三相流化床在两种不同进水方式情况下生物膜培养情况. 研究表明：间歇进水时生成的生物膜能达到200～250？m左右,连续进水时生物膜厚度能达到100？m;前者较为圆滑紧密,而后者的活性较高;较低的启动容积负荷有利于启动挂膜;挂膜完成后进水的容积负荷不能过低,否则容易因污泥负荷低而引起丝状菌膨胀. 通过间歇式进水培养的活性污泥达到了生物量9.65g·L^-1（其中附着生物膜占92.7%）,而连续式进水负荷COD可以达到11.45kg·m^-3·d^-1, 此时COD去除率达到80%.

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 200～250μm, and that formed in a continuance reactor 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 to 9.65 g·L^-1, 92.7 % of which is attachment biofilm, and the loading rate of COD with continuance mode could arrive at 11.45 kg·m^-3·d^-1.