厌氧颗粒污泥工艺处理木材加工废水研究

Treatment of Wood Processing Wastewater by Anaerobic Granular Sludge Process

该文采用厌氧颗粒污泥法处理木材加工废水,研究了不同水力停留时间(HRT)对废水的处理效果及颗粒污泥作为木质素纤维的载体的变化情况。结果表明,随HRT从2 d延长至8 d,COD的去除效果逐渐提高,HRT为8 d时,COD平均降解率为52.39%。扫描电镜下颗粒污泥表面呈层状结构,且存在较多微小孔洞与微管束结构,随着HRT延长,污泥颗粒随之增大,平均粒径从15μm增大至30μm,表明厌氧颗粒污泥可以作为木质素纤维的载体;污泥中EPS成分以蛋白质为主;EEM结果表明,随着HRT的延长,污泥DOM主要物质从溶解性生物代谢产物变成了芳香族(酪氨酸),且类腐殖质物质的明显增加有利于COD的降解。

Wood processing wastewater was treated using an anaerobic granular sludge process. The treatment effect on wastewater and the impact on lignin fiber as sludge core were studied under different hydraulic retention times(HRT). The results showed that the removal efficiency of COD increased with the increase of HRT from 2 days to 8 days. When HRT was8 days, the average COD degradation rate was 52.39%. SEM results also showed that with the increase of HRT, the larger the sludge particles were. In fact, the average particle size of sludge increased from 15μm to 30μm with the increase of HRT from 2 days to 8 days. Moreover, lignocellulose was found to be useful as a carrier for anaerobic bacteria. Besides, EPS in sludge was found to be mainly protein, while EEM results showed that with the extension of HRT, the main substances of DOM changed from soluble biological metabolites to aromatic(tyrosine), and the obvious increase of humus-like substances is conducive to the degradation of COD.