A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has ...A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has the function of nitrification and removing organic substrate. In this study, we focused on the denitrification performance of LBAF and its possible mechanism under thorough aeration. We identified the existence of simultaneous nitrification and denitrification (SND) by analyzing nitrogenous compounds along the flow path of LBAF and supportive microbial microscopy, and studied the effects of air/water ratio and hydraulic loading on the performance of nitrogen removal and on SND in LBAF to find out the optimal operation condition. It is found that for saving operation cost, aeration can be reduced to some degree that allows desirable removal efficiency of pollutants, and the optimal air/water ratio is 10:1. Hydraulic loading less than 0.43 m h?1 hardly affects the nitrification and denitrification performance; whereas higher hydraulic loading is unfavorable to both nitrification and denitrification, far more unfavorable to denitrification than to nitrification.展开更多
目的考察复合式UCT-MBR对生活污水的脱氮除磷效果.方法针对生活污水特点,采用除磷能力较强的UCT(the University of Cape Town process)与膜生物反应器(Membrane Bioreactor,MBR)相结合的工艺,在反应器内投加立体弹性填料,构成复合式UCT...目的考察复合式UCT-MBR对生活污水的脱氮除磷效果.方法针对生活污水特点,采用除磷能力较强的UCT(the University of Cape Town process)与膜生物反应器(Membrane Bioreactor,MBR)相结合的工艺,在反应器内投加立体弹性填料,构成复合式UCT-MBR,形成悬浮污泥与附着污泥共存的复杂生物相体系.结果在HRT=8～12 h,SRT=30 d,膜出水量为10 L/h,气水比为40∶1条件下,经过42 d的污泥驯化,挂膜成功,其后60 d的稳定运行中,对CODCr、NH3-N平均去除率分别达到95.7%、97.7%,出水ρ(NH3-N)<2.4 mg/L.回流比为300%和400%时,TN去除效率分别为78.9%、84.1%,出水ρ(TN)<15 mg/L,并且由于生物膜的作用在好氧区发生了同步硝化反硝化.当硝化液回流比为300%时,TP的去除效果最佳,为83.2%,出水ρ(TP)<1 mg/L,满足一级B标准.结论采用该工艺处理生活污水运行稳定,具有较强的抗冲击负荷能力,出水水质良好,达到了国家生活杂用水的要求.展开更多
基金Funded by the National Key Technologies R & D Program of China During the 10th Five-Year Plan Periods of China (No.2001BA604A01-03).
文摘A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has the function of nitrification and removing organic substrate. In this study, we focused on the denitrification performance of LBAF and its possible mechanism under thorough aeration. We identified the existence of simultaneous nitrification and denitrification (SND) by analyzing nitrogenous compounds along the flow path of LBAF and supportive microbial microscopy, and studied the effects of air/water ratio and hydraulic loading on the performance of nitrogen removal and on SND in LBAF to find out the optimal operation condition. It is found that for saving operation cost, aeration can be reduced to some degree that allows desirable removal efficiency of pollutants, and the optimal air/water ratio is 10:1. Hydraulic loading less than 0.43 m h?1 hardly affects the nitrification and denitrification performance; whereas higher hydraulic loading is unfavorable to both nitrification and denitrification, far more unfavorable to denitrification than to nitrification.
文摘目的考察复合式UCT-MBR对生活污水的脱氮除磷效果.方法针对生活污水特点,采用除磷能力较强的UCT(the University of Cape Town process)与膜生物反应器(Membrane Bioreactor,MBR)相结合的工艺,在反应器内投加立体弹性填料,构成复合式UCT-MBR,形成悬浮污泥与附着污泥共存的复杂生物相体系.结果在HRT=8～12 h,SRT=30 d,膜出水量为10 L/h,气水比为40∶1条件下,经过42 d的污泥驯化,挂膜成功,其后60 d的稳定运行中,对CODCr、NH3-N平均去除率分别达到95.7%、97.7%,出水ρ(NH3-N)<2.4 mg/L.回流比为300%和400%时,TN去除效率分别为78.9%、84.1%,出水ρ(TN)<15 mg/L,并且由于生物膜的作用在好氧区发生了同步硝化反硝化.当硝化液回流比为300%时,TP的去除效果最佳,为83.2%,出水ρ(TP)<1 mg/L,满足一级B标准.结论采用该工艺处理生活污水运行稳定,具有较强的抗冲击负荷能力,出水水质良好,达到了国家生活杂用水的要求.
