生物流化床短程硝化的快速启动及影响因素研究

采用内循环生物流化床反应器处理模拟高浓度氨氮废水,以确定其对处理高浓度氨氮废水的可行性,同时对试验条件进行了优化。结果研究表明:控制温度为(31±1)℃,利用反应器自身流化所携带溶解的空气,反应器内DO值可维持在1.5~2.5 mg/L,调节pH为8.0~8.5。经过42 d的污泥驯化适应时期,进水氨氮(NH4+-N)浓度由50 mg/L提高到300 mg/L。由于流化床采用填料载体微生物膜与活性污泥双重作用,同时载体呈流化状态,接触均匀,有巨大的比表面积,可以使床内保持高浓度的生物量,从而达到高效快速的传质效果。在HRT由开始的16 h缩短到8 h的条件下,氨氮(NH4+-N)的去除率达到90%以上,亚硝氮(NO2--N)的积累率达到75%。且在以后30 d的稳定运行阶段,氨氮(NH4+-N)去除率和亚硝氮(NO2--N)积累率均保持稳定。同时反应器最后出水水质澄清,无需二沉池及污泥处理。

Quick Start-up and Influencing Factors of Partial Nitrification in Biological Fluidized Bed Reactors

In the experiment high performance inner loop fluidized bed biofilm reactor was used for treating high concentration synthetic wastewater of ammonia nitrogen in order to evaluate the performance of fluidized bed biofilm reactors(FBBR)during the treatment of high concentration ammonia wastewater,and determine the optimal experimental conditions through changing operational parameters.Results showed that when temperature of the reactors was(31 ±1) ℃,DO was provided by the running of reactor and kept between 1.5 ~2.5 mg/L,and pH 8.0 ~8.5,ammonia concentration of influent would improve from 50 mg/L to 300 mg/L after 42 days.In the reactor the carrier material was presented as fluidization,which would increase the surface area of carriers,and reach high concentrations of biomass.As the efficient and fast mass transfer effect of the reactor,when HRT was reduced from 16 h to 8 h,ammonia nitrogen removal went up to 90%,and nitrite accumulation rate can be up to 75%.The effluent was clear,and clarifier and sludge treatment system don’t need.