好氧颗粒污泥与絮体活性污泥的竞争试验研究

Experimental research on competition between aerobic granular sludge and activated sludge flocs

采用在序批式反应器中培养50 d的好氧颗粒污泥与同期反应器排出的絮体污泥,在高有机负荷下曝气4 h,颗粒污泥和絮体污泥MLSS较初始时分别增加了67.8%和58.5%,单位体积混合液中颗粒污泥和絮体污泥的个数分别增加了15.4%和4.8%。颗粒污泥和絮体污泥的粒径分布在4 h试验过程中处于动态稳定状态,基本保持不变。曝气4 h后颗粒污泥和絮体污泥平均粒重分别增加45.4%和51.4%,可以看出在对有机底物的竞争中,与絮体污泥相比较,颗粒污泥由于具有较高的活性而占有优势,颗粒污泥的增长速率大于絮体污泥,絮体污泥和颗粒污泥的密度均有明显增长,但颗粒污泥平均粒重增加比例小于絮体污泥。

The aerobic granular sludge that had been cultivated for 50 days in sequencing batch reactor and the sludge flocs discharged from the reactor simultaneously was aerated for 4 hours under high organic loading condition.The results showed that,the MLSS concentration of granular sludge and sludge flocs increased 67.8% and 58.5% respectively,the number of granular sludge and sludge flocs per liter of mixed liquid increased 15.4% and 4.8% respectively.During the 4-hour experiment,the particle size distribution of granular sludge and sludge flocs remained unchanged basically for dynamic stabilization.The average particle weight of granular sludge and sludge flocs increased 45.4% and 51.4% respectively after 4 hours of aeration.It could be concluded that,compared to the activated sludge flocs,aerobic granular sludge had advantage of high activity when degrading organic substrate.The growth rate of granular sludge was higher than that of sludge flocs,the density of the said two kinds of sludge both increased obviously;however,the increase rate of average particle weight of granular sludge was less than that of sludge flocs.