Study of printing and dyeing wastewater treatment by membrane bioreactor enhanced by bio-ferric

摘要

Bio-ferric membrane bioreactor (MBR) was made through adding ferric hydroxide to traditional MBR and forming bio-ferric sludge. Through analyzing treatment efficiency of dyeing and printing wastewater in bio-ferric MBR and traditional MBR respectively, the results showed: COD removal efficiency in bio-ferric MBR was more better than that in traditional MBR which increased 10％ or so, but the influence of HRT on COD removal efficiency wasn't evident; Via changing SRT, it was obtained: bio-ferric MBR could operate in longer SRT while treatment effect couldn't be impacted that could discharge less sludge than traditional MBR which coule get sludge minimization; bio-ferric sludge floes could provide better survival environment for nitrobacteria that made NH3-N removal efficiency stable. The experiment illuminated: the biochemical and physical function of bio-ferric sludge could strengthen the holistic stability of the system. With the development of biological agents, experts and scholars began to study its applications in water treatment, and analyzed its influence on the performance of sludge in order to study its