Abstract:
The salt-tolerant bacteria were used to degrade the organic matter and ammonia nitrogen in the shale field produced water. The degradation performance and membrane fouling characteristics of the anoxic reactor-membrane bioreactor (AR-MBR) as well as the separate MBR reactor were investigated. The difference between the two reactors was that the AR-MBR system was provided with a filament filler to form an anoxic circumstance in front of the MBR reactor. The results showed that the degradation of the AR-MBR combined reaction system was better than that of the MBR reactor alone. The removal efficiencies of TOC were 88% in AR-MBR and 80% in MBR, respectively. The removal efficiencies of ammonia nitrogen were 90% in AR-MBR and 75% in MBR, respectively. The rising of transmembrane pressure (TMP) and the total membrane fouling rate of the AR-MBR were slower than those of the MBR reactor. The main reason was that the particle size of the floc in the AR-MBR reactor was larger than that in the MBR reactor, which was not easy to block the membrane pores. On the other hand, the mass concentrations of soluble microbial products (SMP) and extracellular polymeric substances (EPS) in AR-MBR reactor were lower than those of the MBR reactor, while the mass concentration ratio of protein to polysaccharide (
\rho _\rmPN\rm/\rho _\rmPS) was higher, the reduction of fouling substance on membrane alleviated the membrane fouling phenomenon.