UASB反应器中影响污泥颗粒化的工程因素

Engineering Factors Affecting the Formation of Granular Sludge in UASB Reactor

研究了具有不同微生物群系的接种污泥、流动方式和流速对上流式厌氧污泥床（ＵＡＳＢ）反应器中活性污泥粒化的影响。颗粒化过程包括：微生物絮凝体的形成、亚核的形成，亚核增长和颗粒成熟四个阶段。微絮凝体的形成取决于酸化菌的作用。流体的动量传递和流体对悬浮物的剪切作用是影响亚核形成的关键性工程因素。为此提出最低流速概念，即形成污泥膨胀床的最低流速。合适的进料速率、污泥负荷。

The influence of different inoculum sludges involving different microbial populations,different flow models of stream in a bioreactor and different flow rates on the formation of granular sludge were studied.In the granulation process there were four periods:formation of microbial flocs,formation of subcore,growth of subcore and mature of granules.The production of microflocs could be attributed to acid forming bacteria.The dynamic transfer caused by moving phases and the hydraulic shear effect are the most important factors affecting the formation of subcore.A new concept,lowest limitted flow rate was proposed,that is the lowest flow rate to form the expanded sludge bed.A sufficient feed rate (higher than the lowest flow rate),an appropriate sludge charge and an equal distribution of feed as well as a suitable alkality in medium are the main factors for the scale up and process control of UASB