污水处理运行模式对好氧颗粒污泥特性的影响

研究了运行模式的改变对好氧颗粒污泥优势丝状菌种类,以及对污泥特性所产生的影响.结果表明,序批式活性污泥法反应器(SBR)中出现大量外伸型丝状菌Type 021N,但并未阻碍污泥的颗粒化,且随着絮体污泥颗粒化进程的推进,其对污泥沉降性的影响也在逐步减小,最终得到平均粒径为0.75 mm、污泥容积指数为43 mL/g的成熟...

Effect of Sewage Treatment Operation Mode on Characteristics of Aerobic Granular Sludge

The effect operation mode changes on the dominant filamentous bacteria of aerobic granular sludge and the sludge characteristics were studied.The results showed that a large number of extended filamentous bacteria Type 021 N appeared in the sequencing batch activated sludge reactor(SBR),but it did not hinder the granulation of sludge,and with the progress of the granulation process of floc sludge,its influence on sludge sedimentation gradually decreased,and finally the mature aerobic granular sludge with mean particle size of 0.75 mm and SVI of 43 mL/g was obtained.However,when the mature granular sludge was inoculated into the continuous flow reactor,the granular sludge began to disintegrate and the characteristics of the sludge began to deteriorate.At the same time,the dominant filamentous bacteria was successively transformed into another type of exogenous filamentous bacteria sphaerogenic Natans.Analysis suggested that,overhang type of filamentous bacteria could affect the sludge in the biological area and settling basin between the cycle and its actual residence time in the sedimentation tank was the main reason for the disintegration of granular sludge,the influence was smaller in SBR operation mode and larger in continuous flow mode.