摘要:通过对实验室SBR的四种运行方式的研究比较发现,进水阶段的长短、曝气方式对活性污泥的剩余污泥量和污泥性能(如SVI)都有影响。分级曝气方式下,反应器的污泥产率明显小,而短时进水方式下,反应器的污泥性能最佳。这对通过调整运行方式来减少剩余污泥量或改善污泥性能有一定意义。
关键词:运行方式 曝气 污泥产率 A Study on the Impact of Feeding and Aeration Mode (SBR) on the Sludge Yield and CharacteristicsAbstract:Comparisons among four operations of bench-scale SBRs show that feeding time and aeration mode do have impact on sludge yield and characteristics (e.g. SVI). Sludge yield in SBR under operation of step-aeration is obviously low and sludge in SBR under operation of instant feeding is distinguished with good settleability. The findings are important to sludge quality improvement and excess sludge reduction through operation variation of activated sludge processes.Key words: Operation mode, Aeration, Sludge yield
活性污泥的沉降性能与剩余污泥量对活性污泥法污水处理工艺的运行和运行费用有重要影响.影响活性污泥的沉降性能(SVI)和剩余污泥量的因素有很多,一般认为SVI、剩余污泥量主要与污水类型、污泥负荷、反应器类型有关[1][2]。在为某厂解决SBR系统曝气反应初期溶氧低的问题时,笔者发现在SBR中, SVI、剩余污泥量还与反应器的进水时间和曝气方式有关,并做了相应的研究。1 实验装置与方法1.1 实验装置 两个直径为19 cm 高40 cm的透明有机玻璃容器作为实验SBR反应器。有效水深30 cm,因此有效容积为8.5 L。实验的活性污泥来源于城市污水处理厂的剩余污泥, 经半个月左右的驯化后用于正式实验. 反应器内平均活性污泥浓度3000mg/L左右。两个反应器平行工作,用以比较。曝气系统由一组设在反应器底部的微孔曝气头、空气管道、可调式气体流量计、电磁阀和气源组成。电磁阀用以切换气源(见图1)。各反应器设置一小型搅拌器, 以47转/分的慢速在反应器的进水阶段及反应阶段对混合液进行搅拌. 参考文献1. Chao A C,Keinath T M Influence of process loading indensity on sludge clarification and thickening characteristics2. 周利,彭永臻等(1999) SBR工艺中污泥负荷对丝状菌污泥膨胀的影响 CHINA WATER & WASTEWATER Vol.15, No.63. 哈尔滨建筑工程学院 排水工程(下) 北京:中国建筑工业出版社 19814. Huang, J.Y.C., Cheng, M.D. and Mueller, J.T. (1985) Oxygen Uptake Rates for Determining Microbial Activity and Application5. APHA (American Public Health Association) (1995). Standard Methods for the Examination of Water and Wastewater, 19th edn. American Public Health Association, Washington, DC6. 王凯军,卢少勇,贾立敏和宋英豪(1999)三废处理工程技术手册---废水篇7. Dennis, R.W. and Irvine, R.L. (1979) Effect of Fill: React Ratio on Sequencing Batch Biological Reactors J.WPCF, Vol.51, No.2