Journal of Environmental Engineering Technology ›› 2019, Vol. 9 ›› Issue (1): 21-27.doi: 10.3969/j.issn.1674-991X.2019.01.004

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Study on membrane bioreactor-ultra low-pressure selective nanofiltration for municipal wastewater treatment

ZHANG Hengliang1,2,3,DUAN Liang1,3,*(),YAO Meicheng1,3,WEI Jian1,3,HUANG Yuhua1,3   

  1. 1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    2. College of Water Sciences, Beijing Normal University, Beijing 100875, China
    3. Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • Received:2018-09-03 Online:2019-01-20 Published:2019-01-15
  • Contact: Liang DUAN E-mail:duanliang@craes.org.cn

Abstract:

A pilot-scale experimental device of membrane bioreactor-ultra low-pressure selective nanofiltration (MBR-DF) was constructed to improve the quality of recycled water and the reduction of sludge. The MBR-DF hybrid system was used to treat the municipal sewage and operated in a zero-sludge manner, and a conventional activated sludge process (CAS) was established at the same time. The influent contents of COD, $NH^{+}_{4}$-N, TN and TP were 87.0-165.7, 14.0-31.0, 14.2-32.4, and 2.5-3.3 mg/L, respectively. The results showed that the concentrated water zero-emission MBR-DF system had a good removal effect on COD, $NH^{+}_{4}$-N and $PO_{4}^{3-}$, with the removal rates of 95.7%, 99.0% and 68.5%, respectively. The removal rates of TDS and $HCO^{-}_{3}$ were 13.5% and 31.1% accordingly, and the total hardness of the effluent could be reduced effectively. The DF membrane had a significant retention effect on $PO_{4}^{3-}$ and $SO_{4}^{2-}$, had a poor retention effect on $NO^{-}_{3}$ and had no retention effect on $HCO^{-}_{3}$. After the influent DOM was passed through MBR-DF system, only a small amount of tryptophan-like substances remained. The UV254 reduction rate of the influent DOM was 94.9% and the DOC removal rate was above 98.0% in the MBR-DF system. The degree of conversion of humus to non-humus was higher in the effluent DOM. The removal rates of 17-β estradiol (E2) by MBR-DF system and CAS system were 99.9% and 70.8%, respectively. Therefore, MBR-DF system could effectively reduce the health hazards and ecological threats of effluent in recycling.

Key words: membrane bioreactor-ultra low-pressure selective nanofiltration (MBR-DF), dissolved organic matter (DOM), three-dimensional excitation-emission matrix (EEM), 17-β estradiol (E2);

CLC Number: 

  • X703