移动床生物膜反应器的启动及影响因素的研究

START-UP AND ITS INFLUENCE FACTORS IN MOVING BED BIOFILM REACTOR

采用配制模拟废水进水,研究移动床生物膜反应器(MBBR)的启动挂膜,结果表明,在悬浮填料填充率为40%,pH为6.3～7.6,温度为20～30℃,m(C)/m(N)/m(P)=100:5:1的条件下,ρ(DO)=3 mg/L,HRT=6 h时挂膜速度快,COD、NH3-N去除效率可达到90%。当ρ(DO)=1.5 mg/L时前5天COD去除率略高于ρ(DO)=3 mg/L时,此后COD、NH3-N去除率均稳定在80%左右,ρ(DO)=5mg/L时紊动剧烈,不利于挂膜;HRT=6h和HRT=8h时COD、NH3-N去除率比较接近,且远高于HRT=4 h和HRT=12 h时。在试验范围内,COD、NH3-N处理效率均随着DO、HRT值增大而增大,而后随着增大反而降低,可知DO、HRT过高或过低均不利于启动运行。在HRT=6 h,ρ(DO)=3 mg/L的条件下稳定运行时,COD、NH3-N、TN、TP的去除率均值分别为:89.5%、94%、54.76%、56.1%。

Start-up was researched in moving bed biofilm reactor（MBBR） by simulating wastewater influent.The experimental results indicated that hanged membrane speed relativelyfast when HRT = 6h,ρ（DO）=3mg/L,andCOD,NH3-N removal efficiency were up to 90%,with the premise condition of suspended packing filling rate of 40%,the pH of 6.3～7.6,the temperature of 20～30 ℃,m（C）/m（N）/m（P）= 100：5：1.COD removal rate was slightly higher thanρ（DO） = 3 mg/Lin first 5 days when ρ（DO）= 1.5 mg/L,then COD,NH3-N removal rates were stable around 80%,and it went against hanging membrane because of severe turbulence when ρ（DO）= 5 mg/L;the removal rates of COD,NH3-N were approximate when HRT = 8 h and HRT = 6 h,and much higher than HRT = 4 h and HRT = 12 h.The removal rates of COD,NH3-N were improving as DO,HRT increased,and then with the increase but reduced,which showed that too high or too low DOs and HRTs were detrimental to start-up.The average removal rates of COD,NH3-N,TN,TP were 89.5%,94%,54.76%,56.1% under the stable operation with the conditions of HRT = 6 h,ρ（DO）= 3 mg/L.