XU Ze-bin,HAN Yong-hui,LIU Wan-qiong,et al.Performance of In-line Coagulation and Ultrafiltration Process on Filter Backwash Wastewater Treatment[J].China Water & Wastewater,2021,37(23 23):15-20.
Performance of In-line Coagulation and Ultrafiltration Process on Filter Backwash Wastewater Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
23 23
Page:
15-20
Column:
Date of publication:
2021-12-01
- Abstract:
- Through the pilot test, the effect of ultrafiltration technology on the treatment of filter backwash wastewater and membrane fouling were explored. The results showed that, compared with the direct ultrafiltration process, the growth rate of the transmembrane pressure difference during the inline coagulation-ultrafiltration operation was significantly reduced, indicating that the coagulation pretreatment could effectively alleviate the membrane fouling. When the membrane flux and filtration cycle were small, the membrane fouling was mainly reversible fouling. The larger membrane flux and filtration cycle would cause more serious membrane fouling. In-line coagulation-ultrafiltration had good treatment efficiency for filter backwash wastewater. The average removal rates of turbidity and UV254 were 99.42% and 42.24%, respectively, the effluent CODMn was below 2 mg/L, the iron and aluminum contents were below 0.06 mg/L, and ultrafiltration could basically remove all bacteria and E. coli, ensuring the biological safety of effluent. But the ultrafiltration was not effective in removing ammonia nitrogen and fluorescent organic matter. EDS elemental analysis showed that there were inorganic metal contamination on the surface of the membrane. Therefore, compared with alkaline washing alone, alkaline washing+acid cleaning was better for the removal of membrane fouling. The coagulation-ultrafiltration process has low cost and is suitable for popularization. This research provides technical support and theoretical basis for the treatment and safe reuse of filter backwash wastewater using ultrafiltration technology.
Last Update:
2021-12-01