【摘要】 针对高负荷下出现的反硝化颗粒污泥相互粘连、上浮等不稳定状态,进行了降低进水温度促进颗粒污泥床稳定的研究。当进水温度降至16℃时反应器能稳定运行,颗粒粘连现象减弱,颗粒密度由不稳定时的1.008 5 g/cm3提高到1.022 g/cm3,颗粒沉速为30~50 m/h,此时反应器的负荷为4.0~5.14 gNO3--N/(L.d),对氮的去除速率为0.18 gNO3--N/(gVSS.d);当进水COD和NO3--N浓度分别为225 mg/L和50 mg/L时,对其去除率分别为93%和98%。研究认为,颗粒污泥表面反硝化菌的生长速率过快是引起不稳定的主要原因,降低温度即降低微生物的生长速率有助于颗粒污泥保持稳定。更多还原

【Abstract】 To solve problems such as mutual adhesion and floating of denitrifying granular sludge when influent loads are high,the test of lowering influent temperature to stabilize granular sludge bed was performed.When the influent temperature drops to 16 ℃,the reactor can stably operate and the granule adhesion is weakened.The sludge density is increased from 1.008 5 g/cm3 measured under unstable condition to 1.022 g/cm3 measured after temperature adjustment.The sludge settling velocity is 30 m/h to 50 m/h.At this time,the reactor loading rate is 4.0 to 5.14 gNO-3-N/(L·d),and the nitrogen removal rate is 0.18 gNO-3-N/(gVSS·d).When the influent COD and NO-3-N concentrations are 225 mg/L and 50 mg/L,their removal rates are 93% and 98% respectively.The granule instability is mainly caused by fast growth rate of denitrifying bacteria on the granules.Reducing the temperature,that is,lowering the growth rate of microorganisms,contributes to the stability of the granular sludge.更多还原