How to rebuild the AA / O process after achieving the four types of reuse of surface water?
A2 / O-MBR and its improvement process Although A2 / O process has a good effect of nitrogen and phosphorus removal, but its nitrogen removal efficiency is difficult to further improve. For this reason, a group of scholars such as Adam put forward the wastewater treatment method combining A2 / O with MBR (A2 / O-MBR process), which not only has good effluent quality effect and high pollutant removal rate, but also realizes HRT and SRT Independent of each other, a good solution to the traditional activated sludge simultaneous denitrification and dephosphorization of both sludge age required for different contradictions. For example, a wastewater treatment plant in Beijing (80000 t / d) was upgraded from A2 / O to A2 / O-MBR process. After the renovation, the quality of effluent water was upgraded from Grade A national standard A to landmark B standard in Beijing. The main indicators met Surface Category IV water body standard. During the upgrade process, the plant showed many bright spots, such as small area, continuous sewage treatment, expanded expansion, energy-saving MBR technology, UV plus ozone oxidation technology. In order to improve the capability of denitrogenation and dephosphorization of A2 / O process, a combination of upside down A2 / O-MBR and A2 / OA-MBR can be further formed on the basis of the first-level A-scale revamping. The inverted A2 / O-MBR pilot test showed that this system has an efficient biological phosphorus removal effect, which is mainly due to the ideal phosphorus releasing environment of the inverted A2 / O segment and the interception of phosphorus in the colloidal form by MBR membrane separation. Dong Liangfei et al. A2 / O based on the A2 / OA-MBR process of low-carbon urban sewage treatment pilot study, after 60 days of commissioning operation, the water has basically reached the surface water class IV reuse requirements, and further improve the nitrogen removal Phosphorus level. A2 / O-MBR + membrane separation process On the basis of A2 / O-MBR combined process and its improved technology, further introduction of membrane separation unit as tertiary treatment unit for regeneration and reuse can realize efficient reuse of wastewater. According to the characteristics of depth treatment membrane unit itself, secondary effluent can be treated to surface water of type IV or above. A reclaimed water plant in Beijing (13,000 tons / day) adds a pre-or post-anoxic tank to the traditional A2 / O process and, combined with the MBR, has enabled water quality to reach effluent level IV standards for surface water; further The 70,000 tons / day of MBR effluent is treated with DFRO membrane, and the effluent quality standards are upgraded to meet the Grade III standard for surface water of national standard (GB3838-2002), and the recoverable groundwater or industrial circulation Water, but also to meet the wetland park recharge needs. A2 / O-MBR + constructed wetland process For some A2 / O-MBR processes, such as nitrogen and phosphorus, which occasionally exceed the standard, sub-flow constructed wetlands can be subsequently used to absorb and enrich the roots of plants, release of matrix packing and decomposition of microorganisms, and to further remove plant nutrients such as nitrogen and phosphorus, Can effectively protect A2 / O-MBR process effluent to reach surface water class IV limit. Disc Top Cap,Disc Top Cap Bottle,Disc Top Closures,Plastic Disc Caps Jiangyin First Beauty Packing Industry Co, ltd , https://www.cosmeticpacking.com