Rabah F K J, Dahab M F, Surampalli R Y
Department of Civil Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0531, USA.
Water Sci Technol. 2005;52(10-11):579-86.
Two laboratory scale fluidized-bed biofilm reactors (FBBRs) were used to investigate the biomass concentration and the biofilm characteristics in a high performance FBBR used for the denitrification of exceptionally high-nitrate wastewater (1000 mg-N/L). Reported correlations by other workers for predicting the biomass concentration in FBBR were examined for their validity in comparison with the experimental results of this study and the best set of applicable correlations was recommended. The effects of the two main operational parameters, the superficial velocity and nitrogen loading rate on the biomass concentration in the FBBR were also studied. Correlations for the drag coefficient and the expansion index from the literature, together with the biofilm dry density correlation produced from this study were found to produce the best prediction of the FBBR biomass concentration compared to other reported correlations. The average biomass concentration in the FBBR decreased with the increase of the superficial velocity in the range of 45 to 65 m/h at all the applied nitrogen loadings (i.e. 6, 8, 12 and 16 kg-N/m3(bed).d).
使用两个实验室规模的流化床生物膜反应器（FBBR）来研究用于处理超高硝酸盐废水（1000 mg-N/L）的高性能FBBR中的生物量浓度和生物膜特性。将其他研究人员报道的用于预测FBBR中生物量浓度的相关性与本研究的实验结果进行比较，检验其有效性，并推荐了最佳适用的相关性组合。还研究了两个主要运行参数，即表观流速和氮负荷率对FBBR中生物量浓度的影响。与其他报道的相关性相比，发现来自文献的曳力系数和膨胀指数的相关性以及本研究得出的生物膜干密度相关性对FBBR生物量浓度的预测效果最佳。在所有施加的氮负荷（即6、8、12和16 kg-N/m³（床）·d）下，FBBR中的平均生物量浓度随着表观流速在45至65 m/h范围内的增加而降低。
