Department of Civil & Environmental Engineering, Hanyang University , 55 Hanyangdaehak-ro, Ansan, Kyeonggido, South Korea.
Environ Sci Technol. 2013;47(21):12291-6. doi: 10.1021/es4025639. Epub 2013 Oct 10.
In this study, a steady-state biofilm model was utilized to elucidate the aerobic granular sludge process. In order to describe the experiment data using the model, two different sizes of stabilized aerobic granules (with mean diameters of 0.6 mm and 3 mm, respectively) were investigated through the laboratory operations of sequencing batch reactors (SBRs). On the basis of the estimated parameters from experiments, the model was established to describe the biofilm functions in aerobic granules, such as substrate transfer and substrate concentration variations within the granules. In the modeling at different chemical oxygen demand (COD) concentrations (100-1000 mg/L), the biofilm functions were affected by the characteristics of aerobic granules, such as diameter and density. The larger granules modeled higher substrate fluxes (1.8-14 mg/cm(2)-d) and deeper effective film thicknesses (0.18-1.3 cm). The multi-aspect simulation results demonstrated that the substrate either approaches zero in the film (at low concentration) or penetrates the granules (at high concentration). The sum of aerobic granules in the SBRs can be considered as a mass of biofilm, where the substrate approaches zero at sufficient depth. The steady-state biofilm model could be an effective prediction method for optimizing the aerobic granular sludge process.
本研究利用稳态生物膜模型阐明了好氧颗粒污泥工艺。为了使用模型描述实验数据，通过序批式反应器（SBR）的实验室操作，分别考察了两种不同粒径（平均直径分别为 0.6mm 和 3mm）的稳定好氧颗粒。根据实验中估计的参数，建立了模型来描述好氧颗粒中生物膜的功能，如基质传递和基质在颗粒内的浓度变化。在不同化学需氧量（COD）浓度（100-1000mg/L）的建模中，生物膜功能受到好氧颗粒的特性（如粒径和密度）的影响。较大的颗粒模拟出更高的基质通量（1.8-14mg/cm(2)-d）和更深的有效膜厚度（0.18-1.3cm）。多方面的模拟结果表明，基质在薄膜中接近零（在低浓度下）或穿透颗粒（在高浓度下）。SBR 中的好氧颗粒总数可以被视为生物膜的质量，在足够深的地方，基质接近零。稳态生物膜模型可以成为优化好氧颗粒污泥工艺的有效预测方法。
