LIUXuan-ning,WANGXu-dong,DUShu-ya,et al.Effect of HRT on Treatment Characteristics of MF-OMBR Process[J].China Water & Wastewater,2023,39(19):75-82.
Effect of HRT on Treatment Characteristics of MF-OMBR Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第19期
Page:
75-82
Column:
Date of publication:
2023-10-01
- Keywords:
- forward osmotic membrane bioreactor; microfiltration; HRT; salt accumulation; membrane fouling
- Abstract:
- A separate microfiltration and forward osmotic membrane bioreactor (MF-OMBR) system was constructed for the treatment of domestic sewage, and its performance of continuous operation for 14 days was investigated when the hydraulic retention time （HRT） was 5 h, 8 h and 12 h, respectively, so as to reveal the effect of HRT on the operational performance and membrane fouling of the combined process. When the HRT of the reactor was increased from 5 h to 12 h, more serious salt accumulation was observed. However, the overall conductivity was less than 2.5 mS/cm, indicating that the salinity was low. When the HRT was 5 h, 8 h and 12 h, respectively, there was no significant difference among the initial fluxes of forward osmosis (FO) membrane, whereas the flux decreased by 54.8%, 49.8% and 67.3% respectively after 14 days. Under different HRT conditions, the MF-OMBR system had a good performance for the treatment of domestic sewage. The MF and FO system demonstrated removal rates of more than 93.0% for TOC and more than 95.6% for ammonia nitrogen, and the FO system along had the removal rates of more than 77.0% for TN and more than 98.7% for TP. The comprehensive benefit of MF-OMBR system was the best when the HRT was 8 h. Under different HRT conditions, the organic compounds on the surface of the FO membrane were protein and polysaccharide. When the HRT was 8 h, the effective control of membrane fouling was realized due to the reduction of contaminant loading rate and soluble microbial products (SMP) on the surface of the FO membrane.
Last Update:
2023-10-01