Abstract: The spatial distribution of microbial biomass and activity in pilot-scale two-stage up-flow BAC filters were studied using lipid-P, plate colony count (HPC) and specific oxygen uptake rate (SOUR). Meanwhile, water qualities of the effluent were analyzed to evaluate the performance of BAC units. The results indicated that BAC filters could remove pollutants effectively, with the average removal efficiencies of 43.3 % for COD_Mn, 45.7% for UV₂₅₄, and 92.9 % for ammonia nitrogen, respectively. Furthermore, the removal of pollutants mainly occurred in of the top 400-mm GAC layer in the first-stage BAC filter. The content of lipid-P per unit volume media decreased from 7.49 to 4.86 nmol/cm³ and colony counts decreased from 2.26×10⁷ to 1.12×10⁷ CFU/cm³, indicating that the amount of biomass decreased along flow path. The SOUR per unit volume media was around 10^-2 mg / (cm³?h) and had a different pattern of spatial distribution. In addition, the water quality of the effluent of up-flow BAC filters was biologically safe.

Key words: biological activated carbon, biomass, bio-activity, biological safety

摘要： 采用脂磷法、平板菌落计数法(HPC)和比耗氧摄取速率(SOUR)研究中试规模升流式生物活性炭(BAC)滤池中的生物量和生物活性的空间分布, 同时结合出水水质评价BAC的净水效果。研究结果表明, BAC滤池可有效去除污染物, BAC滤池对COD_Mn, UV₂₅₄和氨氮的平均去除率分别高达43.3%, 45.7%和92.9%。大部分污染物在炭柱的前400 mm滤料层中被去除, 这与生物量分布规律一致。生物量沿水流方向而减少, 磷脂量从7.49 nmol/cm³降为4.86 nmol/cm³; 菌落数由2.26×10⁷ CFU/cm³减少至 1.12×10⁷ CFU/cm³; 单位体积炭的SOUR在10^-2 mg/(cm³?h)的数量级, 具有与生物量不同的变化规律。此外, BAC滤池出水具有生物安全性。

关键词: 生物活性炭, 生物量, 生物活性, 生物安全性