挂膜方式对模拟河道生物反应器启动与稳态运行的影响

Effects of biofilm growing methods on start-up and performances for simulated river bioreactor

对比研究了自然挂膜和改进型闷曝排泥挂膜2种启动方式对模拟河道生物反应器修复微污染水源水过程特性的影响.结果表明,采用改进型闷曝排泥挂膜法有效缩短了弹性填料的挂膜周期,该反应器的NH_3-N去除率比自然挂膜组提前1周达到70%以上.挂膜成熟后,闷曝排泥挂膜组附着的生物膜量和胞外多聚物含量分别为自然挂膜组的1.38倍和1.41倍,生物膜结构亦较为致密,2组反应器的NH_3-N、COD_(Mn)平均去除率最终分别稳定在92%和82%以上.通过改变曝气强度和方式开展系统运行工况研究,发现2组反应器的NH_3-N和COD_(Mn)去除性能呈现不同程度的波动,相比而言,采用闷曝排泥挂膜法启动的反应器对工况变化具有较强的适应能力,P_((NH_3-N))为0.001,一定程度上说明不同挂膜方式对填料附着的生物膜群落结构以及微污染水源水修复系统稳态运行性能影响显著.

Effects of two biofilm growing methods on the start-up and performance of simulated river bioreactors were studied.The river bioreactor operated by enhanced biofilm growing method performed better than the natural biofilm growing one,reducing the start-up period for its earlier maturation indicated by 70%removal efficiency of NH_3-N.In the steady running stage,the removal efficiencies of NH_3-N and COD_（Mn） in two bioreactors both reached 92%and 82%, respectively.The biomass and EPS concentration of the enhanced growing biofilm were 1.38 and 1.41 times more than the natural one,and its biofilm structure was more compact as well.The removal efficiencies of NH_3-N and COD_（Mn） both bioreactors fluctuated when aeration condition changed,and the enhanced biofilm growing method made the ecosystem of biofilm steadier compared with the natural one.T test showed that P_（（nh_3-n）） 0.001,which suggested that there were significant effects of the biofilm growing methods on the community structure of biofilm and stability of bio-system.