Multi-scale individual-based model of microbial and bioconversion dynamics in aerobic granular sludge
Multi-scale individual-based model of microbial and bioconversion dynamics in aerobic granular sludge
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DOI：
10.1021/es070264m
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发表时间：
2007-09-15
影响因子：
11.4
通讯作者：
Van Loosdrecht, Mark C. M.
中科院分区：
文献类型：
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作者：
Xavier, Joao B.;De Kreuk, Merle K.;Van Loosdrecht, Mark C. M.
好氧颗粒污泥是一种集化学需氧量、氮磷负荷于一体的新型紧凑型生物污水处理技术。我们提出了一个好氧颗粒污泥序批式反应器(GSBR)的多尺度模型，该模型描述了复杂的种群动态和营养物质去除。宏观尺度描述了六种溶质(氧、醋酸盐、铵、亚硝酸盐、硝酸盐和磷酸盐)的总体浓度和流出物组成。更细的尺度，一个颗粒(直径1.1毫米)的尺度，描述了四个细菌群-异养菌、氨氧化菌、亚硝酸盐氧化菌和聚磷菌(PAO)-的二维空间排列，使用基于个体的建模(IBM)和物种特定的动力学模型。PAO的模型包括三种内部存储化合物：聚羟基烷酸酯(PHA)、聚磷酸盐和糖原。对反应器长期运行的模拟表明，微生物种群和活性如何依赖于运行条件。还生成了溶质体积浓度的短期动态，其结果与实验室规模的反应堆的实验数据相当。我们的结果表明，GSBR中的氮去除主要是通过交替硝化/反硝化而不是同时硝化/反硝化进行的，这支持了在这一前景广阔的废水处理工艺中改善氮去除的另一种策略。
Aerobic granular sludge is a novel compact biological wastewater treatment technology for integrated removal of COD (chemical oxygen demand), nitrogen, and phosphate charges. We present here a multiscale model of aerobic granular sludge sequencing batch reactors (GSBR) describing the complex dynamics of populations and nutrient removal. The macro scale describes bulk concentrations and effluent composition in six solutes (oxygen, acetate, ammonium, nitrite, nitrate, and phosphate). A finer scale, the scale of one granule (1.1 mm of diameter), describes the two-dimensional spatial arrangement of four bacterial groups-heterotrophs, ammonium oxidizers, nitrite oxidizers, and phosphate accumulating organisms (PAO)-using individual based modeling (IbM) with species-specific kinetic models. The model for PAO includes three internal storage compounds: polyhydroxyalkanoates (PHA), poly phosphate, and glycogen. Simulations of long-term reactor operation show how the microbial population and activity depends on the operating conditions. Short-term dynamics of solute bulk concentrations are also generated with results comparable to experimental data from lab scale reactors. Our results suggest that N-removal in GSBR occurs mostly via alternating nitrification/denitrification rather than simultaneous nitrification/denitrification, supporting an alternative strategy to improve N-removal in this promising wastewater treatment process.