Research on integrated A2O-MBR reactor for wastewater treatment in expressway service area

Abstract

In order to solve the problems of high pollutant concentration and low treatment efficiency of sewage in expressway service area, an integrated A2O-MBR reactor was used to treat the target sewage. On the basis of successful start-up of the reactor, the pollutant removal performances of A2O-MBR process under the influence of different DO, nitrification reflux ratio and C/N were studied. The results showed that A2O-MBR could obtain the best pollutant removal effect under the condition of DO mass concentration of 4 mg/L, nitrification reflux ratio of 300% and C/N of 6. The removal rates of COD, BOD5 and TP were about 90.57%, 93.75% and 93.00%. When the reactor was stable,the effluent mass concentrations of NH4+-N and SS were about 4.2 mg/L and 4.5 mg/L, respectively. The effluent indicators all met the requirements of flushing and vehicle flushing in the Reuse of Urban Recycling Water-Water Quality Standard for Urban Miscellaneous Use(GB/T 18920-2020). The integrated A2O-MBR could reduce the pollution degree of membrane components, thus reducing the maintenance and operation cost of the system, and could provide a reference for the actual engineering transformation of sewage treatment in the service area of highways.

Keywords

• a2o-mbr technology
• biological nitrogen removal
• service area sewage
• contaminant
• water quality standard