厌氧水解酸化-好氧氧化A1/A2/O工艺剩余污泥减量

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(COD_Cr)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.

Residual Sludge Reducing by Anaerobic Hydrolysis-acidification and Aerobic Oxidation Process of A1/A2/O Bio-treatment System

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(COD_Cr) was 2.54kg·(m³·d)^-1 and the HRT was 7.56h in A₁ segment.Meanwhile,the MLVSS/MLSS]value of the sludge in A₁ 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.