ZHANGYu,LüWei,HEJun-guo,et al.Formation Characteristics and Treatment Efficiency of Aerobic Granular Sludge under Flat and Folded Plate Flow Conditions[J].China Water & Wastewater,2025,41(11):31-40.
平、折板流态下好氧颗粒污泥形成特性与处理效能
- Title:
- Formation Characteristics and Treatment Efficiency of Aerobic Granular Sludge under Flat and Folded Plate Flow Conditions
- Keywords:
- aerobic granular sludge; computational fluid dynamics（CFD）; flow condition; turbulent parameter; particle size; particle settling velocity
- 摘要:
- 好氧颗粒污泥（AGS）因其独特的分层结构和沉淀特性，成为污水处理研究与应用的热点，但其存在造粒速度慢、易解体等问题。为此，开展了平、折板流态下AGS形成与处理效能的研究，通过计算流体力学（CFD）对平、折板反应器内部流态进行模拟计算，并利用污泥浓度、污泥沉降比、粒径、沉速、Zeta电位、污泥接触角、热力学和微生物群落结构评估流态对AGS形成的影响。结果表明，平、折板的引入显著影响反应器内部湍流参数，使得反应器内部平均湍流参数呈现出异波组>同波组>平板组>空白组的规律；随着反应器内部液相平均速度、湍动能和湍流耗散率的增大，以及柯尔莫哥洛夫微尺度的减小，污泥表面负电荷量显著降低，污泥表面疏水性增强，促进了微生物细胞间的聚集；异波组经过30 d的运行，形成了成熟稳定的AGS，在第80天污泥平均粒径达到835.7 μm，沉降速度达到58.82 m/h，COD、TN、TP去除率分别达到98.30%、80.36%和67.34%，较平板组粒径增加54.02%，沉降速度提升56.35%，功能微生物的丰度显著增加；湍流耗散率和柯尔莫哥洛夫微尺度与AGS理化性质参数表现出较强的相关性，湍流耗散率的增大与柯尔莫哥洛夫微尺度的减小，增加了微生物细胞间的碰撞机会与碰撞频率，促进了AGS的形成。
- Abstract:
- Aerobic granular sludge (AGS) has become a hot topic in wastewater treatment research and applications due to its unique layered structure and settling characteristics. However, it faces challenges such as slow granulation rate and easy disintegration. This paper investigated the formation and treatment efficiency of AGS under flat and folded plate flow conditions. Computational fluid dynamics (CFD) smulations were conducted to analyze the flow patterns within the reactors, and various parameters such as sludge concentration, sludge settling ratio, particle size, settling velocity, Zeta potential, sludge contact angle, thermodynamics, and microbial community structure were used to evaluate the impact of flow patterns on AGS formation.The results showed that the introduction of flat and folded plates significantly influenced the internal turbulent parameters of the reactor, with the average turbulent parameters following the trend: different-wave group > same-wave group > flat plate group > blank group. As the average liquid velocity, turbulent kinetic energy, and turbulent dissipation rate within the reactor increased, and the Kolmogorov microscale decreased, the negative charge on the sludge surface significantly decreased, and the hydrophobicity of the sludge surface increased, which promoted aggregation between microbial cells. After 30 days of operation, the different-wave group formed a mature and stable AGS, with the average particle size reaching 835.7 μm on the 80th day, a settling velocity of 58.82 m/h, COD removal efficiency of 98.30%, TN removal efficiency of 80.36%, and TP removal efficiency of 67.34%. The particle size increased by 54.02%, and the settling velocity improved by 56.35% compared to the flat plate group, with a significant increase in the abundance of functional microorganisms. The turbulent dissipation rate and Kolmogorov microscale showed a strong correlation with the physicochemical properties of AGS. The increase in turbulent dissipation rate and decrease in Kolmogorov microscale enhanced the collision opportunities and frequency between microbial cells, thereby promoting AGS formation.
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