流体流速对好氧颗粒污泥快速培养的影响

Influences of fluid flow rate on the rapid culture of aerobic granular sludge

针对好氧颗粒污泥的快速培养,研究了流体流速对好氧颗粒污泥形成特性的影响机制.由于反应器构型的差异,造成水力剪切力与流体特性的不同,从而对好氧颗粒污泥的形成产生较大影响.研究表明,在圆筒式SBR反应器中接种厌氧活性污泥,在36d时培养得到了成熟的颗粒,与挡板式反应器相比提前了4d左右,且MLSS提高了16.2%,达到5023mg/L;颗粒也更加致密,SVI达到45m L/g,远好于挡板式SBR反应器(序批式反应器)的SVI 63m L/g.原因是与挡板式SBR反应器相比,圆筒式SBR反应器的平均液相流速更高,气泡分布更均匀,水力剪切力更强.因此圆筒式SBR反应器培养好氧颗粒污泥的时间较短,污泥颗粒化的速度提高,得到的颗粒污泥更加紧凑密实.

The mechanism of the reactor configuration on the aerobic granular sludge formation was studied in order to culture aerobic granular sludge with high efficiency. Since the configuration of the reactor could affect the hydraulic shearing force and the fluid properties, it would play an important role in the formation of aerobic granular sludge. The anaerobic activated sludge was inoculated in the SBR（Sequencing Batch Reactor）, and the mature particles in the cylinder SBR were achieved at 36 d while particles in the baffle SBR were cultured successfully at 40 d. Compared with the baffle SBR, the MLSS in the cylinder SBR was higher, which increased by 16.2% and reached 5023 mg/L. The particles in the cylinder SBR were denser and SVI reached 45 m L/g, far better than that of 63 m L/g in the baffle SBR. The reason is that the cylinder SBR can provide some advantages such as higher average liquid velocity, more uniform bubble distribution, and stronger hydraulic shear force. The structural characteristics of the reactor can affect the hydraulic characteristics, so the cylinder SBR cultivation of aerobic granular sludge for a short time, and the rate of sludge granulation faster and the granular sludge are more compact.