厌氧水解酸化-好氧氧化A_1/A_2/O工艺剩余污泥减量  

Residual Sludge Reducing by Anaerobic Hydrolysis-acidification and Aerobic Oxidation Process of A_1/A_2/O Bio-treatment System

作　　者：杨波[1] 陈季华[1] 奚旦立[1] 沈佳璐[1] 

机构地区：[1]东华大学环境科学与工程学院,上海200051

出　　处：《环境科学》2006年第3期478-482,共5页Environmental Science

基　　金：上海市科委基金项目(02DZ12096)

摘　　要：在碱减量印染废水A1/A2/O生物处理系统,通过污泥回流、把剩余污泥回流到A1段,利用A段污泥的水解、酸化和O段微生物的好氧氧化作用可有效实现对回流剩余污泥的减量,同时O段好氧污泥的表观产率系数下降,系统产生的剩余污泥量减少.厌氧水解酸化-好氧氧化A1/A2/O工艺实现污泥减量由3段共同完成:A1段实现回流剩余污泥的“液化”和惰性化;A2段对系统污泥减量起到了强化作用;而O段微生物的合成作用在逐渐减弱.6个月连续运行的动态试验表明,在A1段的容积负荷(CODCr)为2.54 kg.(m3.d)-1、水力停留时间为7.56h条件下,A1段利用水解酸化作用对回流剩余污泥的减量达到67.87%,系统O段好氧污泥的表观产率系数也下降到试验初始时的45.5%.在A1/A2/O污泥减量系统中,各段污泥性状发生了变化,A1段污泥[MLVSS/MLSS]值从试验开始时的0.718 2下降到0.592 2,A2段污泥[MLVSS/MLSS]值从0.667 3下降到0.526 7,剩余污泥的减量是活性污泥逐渐惰性化过程,污泥的粒度分析也证明了这一点.In the A1/A2/O bio-treatment system treating alkali minimization and dyeing - printing wastewater, with the function of hydrolysis-acidification in A segments and aerobic oxidation in O segment, residual sludge could be reduced effectively by recycling of sludge to A1 segment. Meantime, the observed sludge yield coefficient declined and the sludge produced in O segment decreased. The anaerobic hydrolysis-acidification and aerobic oxidation A1/A2/O process realized the sludge reducing by the three segments conjunctly, i.e. recycled sludge was liquefied and inactivated in A1 segment and then intensified in A2 segment, while the assimilating function in O segment was weakening gradually. During the 6-month dynamic-experiment, it has been tested that the reduction rate of residual sludge in the system reached to 67.87 % and the observed sludge yield coefficient of O segment decreased to 45.5 % of the initial stage when the volume loading （CODCr） was 2.54kg· （ m^3· d）^ - 1 and the HRT was 7.56h in A1 segment. Meanwhile, the [ MLVSS/MLSS]value of the sludge in Al segment was reducing from 0.718 2 to 0.592 2 and that of the sludge in A2 from 0.667 3 to 0. 526 7. Study on the sludge particle size distribution of every segment also demonstrated that sludge reducing and mineralization occurred when sludge was inactivated gradually in the A1 and A2 segments.

关 键 词：厌氧水解酸化 好氧氧化 污泥减量 A1/A2/O生物处理系统 碱减量印染废水 

分 类 号：X791[环境科学与工程—环境工程]