粒径对番茄酱废水好氧颗粒污泥性能的影响

Effect of Particle Size on the Performance of Aerobic Granular Sludge in Tomato Sauce Wastewater

摘要:

颗粒污泥的培养基质、粒径影响着颗粒的生物活性、传质效应及菌群的结构分布和协同竞争关系，进而影响出水效果。用番茄酱废水在SBR反应器中成功培养颗粒污泥并稳定维持185天，筛分出4种粒径范围的颗粒进行同步序批式实验，考察污泥特性及对番茄酱生产废水的除污效能。结果表明，0.45~1 mm的颗粒形状不规则，表面孔隙率较小；1~1.6 mm和1.6~2 mm的颗粒污泥趋于球状和椭球状，表面光滑，结构较密实；2~8 mm的大颗粒污泥虽然表面沟壑较多，出现孔隙，但系统稳定性能维持较好，孔隙的存在可能为内部物质的运输以及颗粒内部微生物代谢产物的排出提供条件。颗粒污泥的平均沉速和比重与粒径大小呈正相关，含水率与粒径大小呈负相关，大大减少了剩余污泥的产量。1~1.6 mm和1.6~2 mm的颗粒污泥相比0.45~1 mm和2~8 mm的颗粒污泥对有机物具有良好的降解能力，对COD的去除率分别达97.8%和94.2%；1.6~2 mm的颗粒污泥对NH4+-N，PO43--P的降解效果最佳，去除率分别达92.7％和99%；0.45~1 mm颗粒污泥对PO43--P的去除效率最低为69%。

Abstract:

The biological activity, mass transfer effect of the particles and the structural distribution and synergistic relationship of the internal flora are affected by the culture substrate and particle size of the granular sludge, thus determining the effluent quality.The aerobic granules were successfully treated in the SBR reactor for 185 days using the tomato paste processing wastewater as a substrate.The particles of four sizes were sieved for simultaneous batch experiments to examine the sludge characteristics and the decontamination efficiency of the tomato paste processing wastewater. The results showed that the particle of 0.45~1 mm is irregular in shape and the surface porosity is small; 1~1.6mm and 1.6~2 mm tend to be spherical and ellipsoidal, with a smooth surface and dense structure; Although there are more surface gullies and pores in the 2~8 mm, the stability of the system could be maintained well. The presence of pores may provide conditions for the transport of internal materials and the excretion of microbial metabolites within the particles. The average sedimentation rate and specific gravity are positively correlated with the granule size; the water content is negatively correlated with the particle size, which greatly reduced the production of excess sludge. Compared with the granular sludge of 1~1.6 mm, 1.6~2 mm, 0.45~1 mm and 2~8 mm, the latter two particles have better ability to degrade organic matter, and the removal rates of COD are 97.8% and 94.2%, respectively; 1.6~2mm has the best degradation effect on NH4 -N and PO43--P, with the removal rates of 92.7% and 99%, respectively. The removal effect of 0.45~1 mm granular sludge on PO43--P is 69%.