【摘要】 以实验室小试SBR反应器为载体接种普通活性污泥,研究了强化生物除磷系统对颗粒污泥形成的促进作用并探讨了其形成机理。试验结果发现:在生物脱氮运行阶段,SBR中的活性污泥能维持较稳定的絮体状态,平均SVI为138.9ml·g-1;当系统转为生物除磷方式运行时,随着除磷效果的好转,反应器中的污泥逐渐转化为颗粒污泥,平均SVI降低至74.1ml·g-1,颗粒污泥的平均粒径为0.8mm。因此,SBR生物除磷系统有利于颗粒污泥的形成。试验发现在强化生物除磷系统厌氧释磷的过程中会有带正电的微粒大量生成,它们可以作为颗粒污泥的晶核吸附带负电的细胞体,进而促进颗粒污泥的形成。强化生物除磷颗粒污泥系统有着较为稳定的磷去除性能,除磷效率接近100%。更多还原

【Abstract】 The promoting effect on the formation of granular sludge by inoculating activated sludge in the enhanced process of biological phosphorus removal was studied in a laboratory-scale sequencing batch reactor (SBR).The results showed that the activated sludge kept in stabilized flocculent state at biological denitrification stage,and the average SVI was 138.9 ml·g-1,while at biological de-phosphorus one the activated sludge flocs became granular sludge gradually as the performance of P removal became better.The average SVI decreased to 74.1 ml·g-1 and the average diameter of the granules was 0.8 mm.Therefore,the biological phosphorus removal process performed in SBR favored for the formation of granular sludge.Moreover,it was found that a lot of positive charged particles were formed with the release of phosphorus at the anaerobic stage in the biological de-phosphorus process.These particles could serve as the cores of granules to attract the negative charged cells and stimulate the granulation.The granular sludge system of enhancing biological de-phosphorus have an excellent ability for the removal of phosphorus. The average removal rate of P was nearly 100%.更多还原