The Research And Application Of A/O-SBMBBR To Treat The Domestic Sewage

Actual domestic wastewater contains sucrose, glucose and other organic, also some eutrophication such as nitrogen and phosphorus, etc. Zero valent iron can promote the carbohydrates transformed into volatile fatty acids (VFA), polyphosphate accumulating organisms (PAOs) can take up VFA and store them intracellularly as carbon polymers, named poly-b-hydroxyalkanoates (PHAs). Study on the influence of COD、NH4+-N、PO43--P、 N03--N and TN when put zero valent iron into A/O-SBMBBR, also research the method of the biofilm growth on suspended carrier. The equipment of ship sewage treatment was also designed and studied. The experimental results were shown as follows:(1) Compared to the difference of biological membrane hanging using "discharging the sludge rapidly" and "discharging the sludge in a stage" in20℃, we found that the pormer is more quickly than the latter. In two weeks, there was much membrane on the carriers.(2) When used glucose as carbon and the average influent COD concentration was300mg/L, anaerobic effluent was80mg/L and100mg/L in R1and R2, with the removal efficiency was73.3%and66.7%, respectively; aerobic effluent was20mg/L and40mg/L, with the removal efficiency was93.3%and86.7%, respectively, the R1has a better removal efficiency, so zero valent iron can promote COD degradation.The NH4+-N concentration was slightly higher in R1than R2in aerobic effluent, the removal efficiency was42.7%in R1and43.5%in R2. Both of the reactors average effluent COD concentration was below30mg/L, so there is no impact of zero valent iron for NH4+-N. NO3--N concentration has not a increase in aerobic effluent, however, NH4+-N concentration has a big decrease, simultaneous nitrication and denitrication happened in the R1than R2.(3) The PO43--P removal efficiency was bad in reactors, there was no phosphorus release in anaerobic, and still has a high concentration in aerobic effluent, the presence of glucose in substrate is considered a cause of enhanced biological phosphorus removal (EBPR), though used sodium acetate as carbon, it can be improved. P removal is major for physicochemical method, but not EBPR. Because of a lower NH4+-N removal efficiency, making TN removal also bad, zero valent iron didn’t have a positive effect on NH4+-N removal.Make sure the best HRT of anaerobic and aerobic by detecting the water quality in effluent.(4) The ship sewage treatment integrated equipment was designed reasonable. The equipment was carried in10-15℃, the average COD in effluent was35.4mg/L, which will be satisfied with<Ship pollutant discharge standards>(GB3552-83) and have a good effect.