Membrane Fouling of PAC/UF Process Treating Micro-polluted Source Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
11
Page:
27-32
Column:
Date of publication:
2020-06-05
- Keywords:
- font-size: 10pt; ">powdered activated carbon; ultrafiltration; micro- font-size: 10pt; "> polluted source water; membrane fouling; organic matter
- Abstract:
-
A bench- scale equipment of PAC/UF short-flow process was built to investigate the synergistic effect between powdered activated carbon (PAC) and ultrafiltration (UF) membrane.The removal effect of organic matter from micro-polluted source water by the combined process was explored, and membrane fouling was systematically investigated. To ensure the removal effect of DOC and UV254, the optimal dosage and adsorption time of PAC were 50 mg/L and 2 h, respectively.Under the optimal dosage, the reversible resistance of the UF membrane decreased from 5.91×1011 m-1 to 5.20×1011m-1 when the PAC adsorption time increased from 10 min to 120 min. During the optimal adsorption time, the reversible resistance decreased from 5.70×1011m-1 to 5.12×1011m-1 when the PAC dosage increased from 25 mg/L to 100 mg/L. Through characterizing the molecular weight distribution, hydrophilicity/hydrophobicity and fluorescent components of raw water before and after PAC adsorption, the mechanism of PAC to relieve membrane fouling was preliminarily revealed. PAC adsorption could effectively remove small hydrophobic organic matters, humic acid and other macromolecular organic matters that caused irreversible membrane fouling, and thus the UF membrane fouling was alleviated.
Last Update:
2020-06-01