Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 243-251.doi: 10.13278/j.cnki.jjuese.20180272

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Effects of Solid Retention Time on Organic Matter Recovery Directly from Municipal Wastewater by High Loaded Bioflocculation Membrane Reactor

Wan Liguo1,2, Lin Qiao1, Zhang Lijun1, Zhang Wenhua1,2, Long Beisheng1,2, Ren Zhimin1,2   

  1. 1. School of Water Conservancy&Environment Engineering, Changchun Institute of Technology, Changchun 130012, China;
    2. Jilin Provincial Key Laboratory of Municipal Wastewater Treatment(Changchun Institute of Technology), Changchun 130012, China
  • Received:2018-10-25 Published:2020-02-11
  • Supported by:
    Supported by National Science and Technology Major Project (2012ZX07202-009-01), Natural Science Foundation of Jilin Province (20180101317JC), Provincial Industrial Innovation Special Fund of Jilin Province (2019C055), Key Science and Technology of Jilin Province (20160204006SF) and Seed Foundation of Changchun Institute of Technology (320180027)

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Abstract: In order to optimize the process parameter of high loaded bioflocculation-membrane reactor (HLB-MR) and improve its efficiency of recovering organics in municipal wastewater, the organics removal, bioflocculation, organics recovery, and membrane fouling of the reactor were investigated under different solid retention time (tSR) in parallel. When the HLB-MR operated at tSR of 0.2, 0.6, and 1.0 d respectively, all the efficiencies of organics removal reached above 85% and the chemical oxygen demands (COD) of permeate were all stable at around 30 mg/L. The bioflocculation effect was enhanced with the extension of tSR, and the flocculation efficiency of colloid COD increased from 66% when tSR was 0.2 d to 95% when tSR was 1.0 d. The mineralization loss rate of organics increased gradually from 6.9% when tSR was 0.2 d to 10.5% when tSR was 1.0 d, while the recovery rate of total COD decreased gradually. The membrane fouling potential of the concentrate in the reactor was gradually alleviated with the extension of tSR, which was related to higher EPS yield, better bioflocculation effect and lower particle fraction of fine particles (0-1 μm) under a longer tSR in the reactor. Compared with 0.2 d and 1.0 d, 0.6 d was considered to be optimal tSR of the HLB-MR from a comprehensive perspective. Under this condition, the flocculation efficiency of COD was up to 90%, the membrane fouling was relatively light, the total COD loss rate was as low as 7.4%, and the recovery rate of total COD could be as high as 80% if the loss of organic matter was ignored during the membrane cleaning.

Key words: municipal wastewater, solid retention time, bioflocculation, membrane reactor, organics recovery, membrane fouling

CLC Number: 

  • X703.1
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