不同丙酸盐/乙酸盐比对单级好氧生物除磷的影响

在2个序批式反应器(R1、R2)中,采用合成废水,研究了废水中常见的两种挥发性脂肪酸(VFAs)盐-丙酸盐和乙酸盐-的不同浓度比值(R1:丙酸盐/乙酸盐=0.165;R2:丙酸盐/乙酸盐=2.00)对于单级好氧生物除磷的影响.结果表明,经过30d的驯化后,R2的除磷效果要优于R1,R1和R2的平均去除率分别为77.95%和84.79%.但是,R1中单位微生物的除磷性能要好于R2,R1单位微生物磷平均去除量为8.66mg/g,R2为8.03mg/g.静置期,R1和R2中均有明显的释磷现象,但R2释磷量大于R1,单位微生物的释磷量也大于R1,可能的原因是R1中尚有部分糖原在静置期分解供能,而R2中全为聚磷分解供能.

Effect of different ratios of propionate to acetate on phosphorus removal in sequencing batch reactor with single-stage oxic process

To investigate the effect of different concentration ratios of propionate to acetate on phosphorus removal in single-stage oxic process, two lab-scale sequencing batch reactors (SBRs) were operated (R1: propionate to acetate ratio=0.165; R2: propionate to acetate ratio=2.00) using synthetic wastewater. After a period of sludge acclimation (30d), R2 showed a higher SOP removal efficiency than R1. The average efficiency of phosphorus removal in R1 and R2 were 77.95% and 84.79% respectively. However, the phosphorus removal amount per MLVSS in R1 was higher than R2. The phosphorus removal amount per MLVSS in R1 was 8.66mg/g while in R2 was 8.03mg/g. In the idle phase, though obvious phosphorus release was observed in both R1 and R2, the content of phosphorus released in R2 was higher than that in R1. The phosphorus release amount per MLVSS of R2 was higher than R1. Besides, glycogen in R1 degraded obviously while that in R2 seldom degraded, which maybe the reason why the phosphorus release amount per MLVSS of R2 was higher than R1.