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首页> 外文期刊>Separation and Purification Technology >Physical and hydrodynamic properties of aerobic granules produced in sequencing batch reactors
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Physical and hydrodynamic properties of aerobic granules produced in sequencing batch reactors

机译：顺序分批反应器中产生的好氧颗粒的物理和流体力学特性

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摘要

The structural and hydrodynamic properties of aerobic granules, such as their morphology, fractal dimension, porosity, size distribution, settling velocity, permeability, and shear strength, were characterized. Microbial granules were formed in two sequencing batch reactors (SBRs) that are used to treat glucose-based synthetic wastewater. The first SBR (R1) had a low pH of about 3.0, due to low influent alkalinity (28.7 mg CaCO3/L), and produced fungi-dominated granules. The second SBR (R2) had a pH of around 8.1, due to high influent alkalinity (301 mg CaCO3/L), and produced bacteria-dominated granules. The fungal granules were larger and weaker, with a loosely packed fluffy structure, whereas the bacterial granules were smaller and stronger and had a compact structure. The granules from both Rl and R2 were fractal aggregates, and they had fractal dimensions of 2.23 and 2.42, respectively. The settling velocities in water for the granules from Rl ranged from 0.38 to 2.67 cm/s. Those from R2 ranged from 0.42 to 3.21 cm/s. This is in good agreement with the settling velocities predicted by Stokes' law for porous but impermeable spheres. The fungal granules were almost completely impermeable, with an average fluid collection efficiency of 0.006, whereas the bacterial granules were slightly permeable, with an average fluid collection efficiency of 0.052. The results demonstrate that biomass enrichment in bioreactors can be achieved by the generation of dense and fast-settling sludge granules. By controlling the feeding condition, different types of aerobic granules can be produced with different structural features and hydrodynamic properties.
机译：表征了好氧颗粒的结构和流体力学特性，如形态，分形维数，孔隙率，尺寸分布，沉降速度，渗透率和剪切强度。微生物颗粒是在两个顺序分批反应器（SBR）中形成的，用于处理葡萄糖基合成废水。第一SBR（R1）由于进水碱度低（28.7 mg CaCO3 / L）而具有约3.0的低pH，并产生了以真菌为主的颗粒。由于较高的进水碱度（301 mg CaCO3 / L），第二个SBR（R2）的pH值约为8.1，并产生了以细菌为主的颗粒。真菌颗粒较大且较弱，具有松散堆积的蓬松结构，而细菌颗粒较小且较强且具有致密结构。来自R1和R2的颗粒均为分形聚集体，它们的分形维数分别为2.23和2.42。来自R1的颗粒在水中的沉降速度为0.38至2.67cm / s。 R2的范围从0.42到3.21 cm / s。这与斯托克斯定律预测的多孔但不可渗透的球体的沉降速度非常吻合。真菌颗粒几乎完全不渗透，平均流体收集效率为0.006，而细菌颗粒略微渗透，平均流体收集效率为0.052。结果表明，可以通过产生致密，快速沉降的污泥颗粒来实现生物反应器中生物质的富集。通过控制进料条件，可以生产具有不同结构特征和流体动力学特性的不同类型的好氧颗粒。

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