强化MBR处理含酚毒性废水及膜过滤特性的研究

Study on the treatment of the toxic wastewater with phenol and membrane filtration performance in an enhancing membrane bio-reactor

考察添加白腐菌的生物强化膜生物反应器(EMBR)对含酚毒性废水的强化处理效果及其对膜过滤特性的影响.在优化工艺条件下,T=25℃,pH=6.5,水力停留时间(HRT)=10 h,菌种采用粒状活性炭(GAC)负载形式,进水TOC(总有机碳)容积负荷从0.96 kg/(m3.d)增至2.4 kg/(m3.d).实验结果表明:EMBR比传统膜生物反应器(CMBR)处理废水效果更佳(TOC平均去除超过90%),且在研究范围内负荷越高强化处理效果越显著,表明EMBR工艺具有更强的耐负荷冲击及抗毒性.此外,EMBR具有更高的临界通量[20.6 L/(m2.h)],膜持续运行时间更长,且膜污染速率及不可逆内部膜污染阻力均比CMBR有明显降低,表明其在改善膜污染方面亦具有优势.

The efficiency of the treatment of toxic wastewater with phenol in an enhancing membrane bio - reactor （EMBR） in the presence of white rot fungus was investigated and the effects of the bio - augmentation treatment on the characteristics of membrane filtration were also discussed. Under the optimum operation conditions： T = 25 ℃, pH=6.5 and HRT = 10 h, the experimental results illustrated that EMBR had the better treatment efficiency （TOC removal rate was 〉94 % ） than conventional membrane bioreactor （CMBR） when the volume loading rate of the influent was 0.96-2.4 kgTOC/（m3·day）. And EMBR had more obvious enhancing efficiency while the volume loading rate is higher, i.e. , EMBR could endure both high loading and toxicity. Comparing to CMBR, EMBR had higher critical flux, longer sustainable operation period and obvious reduction of the membrane fouling rate. The irreversible internal resistance of membrane was also investigated for EMBR. It was concluded that EMBR had obvious advantages in terms of membrane fouling improvement.