曝气生物流化床(ABFB)处理煤气化废水的研究

Study on coal gasification wastewater treatment with aerated biological fluidized bed (ABFB)

介绍一种曝气生物流化床的基本原理及特点,制作了总有效容积为1.5m3的曝气生物流化床(ABFB)中试设备,流化介质为合成高分子多孔材料,其物理性能为:持水量25倍、比表面积≥200m2/g、含氮量6.72%,载体带有-NH2、-COOH、-OH、环氧基等活性基团可与微生物结合而固定化微生物,载体中生物量平均为28g/L(H2O),故具有很高的处理效率.对平均值为COD 3450mg/L、NH4+-N 451mg/L、挥发酚为177 mg/L的煤气化废水,经过ABFB处理后,其处理水中COD 57.7mg/L、NH4+-N 0.285mg/L、挥发酚0.434mg/L,其运行效果优于曝气生物滤池(BAF)、接触氧化、活性炭流化床.ABFB具有运行稳定、抗冲击负荷强的特点,是一种先进的水处理技术.

This paper introduces the fundamental principle and characteristics of the ABFB. The ABFB pilot plant with bulk effective volume of 1.5m3 has been made, and its fluidized medium is synthetic porous polymer material. Thephysical properties of the material are 25 times of water regain, specific surface area≥200m2/g, nitrogen content=6.72%, its holding of active groups -NH2, -COOH, -OH, epoxy etc., which are surtable for combination of support andmicroorganism as well as adoption of immobilized microorganism technology. The average biomass in the support is 28g/L (H2O), so it has quite high treating efficiency. There are COD=3450mg/L, NH4+-N=451mg/L and volatile phenol= 177mg/L in coal gasification wastewater while the water treated by ABFB has COD=57.7m2/g, NH4+-N= 0.285mg/L and volatile phenol=0.434mg/L. Its running effect is better than those of biological aerated filter (BAF) and contact oxidation and active carbon fluidized bed. ABFB has characteristics of steady running and powerful resistance to impact load, so it is a kind of advanced technology in wastewater treatment.