不同表观气速对好氧颗粒污泥净化苯酚废气的影响

The effects of superficial gas velocity on the phenol waste gas degradation by aerobic granules

实验设置了0.7、1.2、2.0、2.5和3.0cm·s-15个不同表观气速,考察其对好氧颗粒污泥净化苯酚废气的影响.研究发现当表观气速在0.7～3.0cm·s-1之间时,好氧颗粒污泥表现出良好的稳定性,苯酚去除率达到95%以上.随着表观气速的提高好氧颗粒污泥各项理化指标均有不同程度的改善,胞外多聚物(extracellular polymeric substances,EPS)产量显著提高,同时PS/PN值不断增大,颗粒污泥的疏水性和稳定性能逐渐增强.好氧颗粒污泥对苯酚废气的降解过程的拟合结果显示当表观气速为2.5cm·s-1时,比苯酚降解速率达到最大值19.46mg·g-·1min-1.

The effects of superficial gas velocity on the degradation of phenol waste gas by aerobic granules were studied.The results showed that aerobic granules performed stably and effectively with phenol removal rates over 95% at superficial gas velocities from 0.7 to 3.0 cm · s-1.With the increasing of superficial gas velocities,the physical and chemical characteristics of aerobic granules were improved including the increasing of hydrophobicity,PS/PN and amount of extracellular polymeric substances（EPS）,which resulted in the stable operation of the aerobic granules.The simulation of the phenol waste gas degradation by aerobic granules indicated that the highest specific phenol degradation rate was 19.46 mg · g-1 · min-1 when superficial gas velocity was 2.5 cm · s-1.