Research on Biological Contact Oxidation — Ultrafiltration Membrane System for Community Intermediate Water Reuse
This issue is mainly on biological contact oxidation - ultrafiltration membrane water reuse project application. By the tracking test of the operation period, the system optimum operating parameters were investigated and determined. Furthermore, the organic matter and ammonia nitrogen removal of the system were analyzed emphatically, and the economic and environmental benefits of the water reuse project were evaluated. It was found out that, the system for the removal of CODcr and ammonia nitrogen was stable and efficient, with an average removal rate of 92.37% and 89.40%, respectively, and the effluent has reached domestic miscellaneous water quality standard. In addition, the unit cost of this water treatment was 2.05 yuan/m3, which was lower, comparing with conventional activated sludge and three stage biochemical process for water reuse. To sum up, the biological contact oxidation - ultrafiltration membrane process combined the advantages of traditional methods of wastewater treatment and membrane bioreactor (MBR), and was at the high level for CODcr and ammonia nitrogen removcal, besides economic and environmental benefits. The biological contact oxidation - ultrafiltration membrane process can be popularized as one of the water reuse technologies.