PAC/UF工艺处理微污染水源水的膜污染特性
- Title:
- Membrane Fouling of PAC/UF Process Treating Micro-polluted Source Water
- Keywords:
- font-size: 10pt; ">powdered activated carbon; ultrafiltration; micro- font-size: 10pt; "> polluted source water; membrane fouling; organic matter
- 摘要:
-
为了考察粉末活性炭（PAC）和超滤（UF）的协同作用，构建了PAC/UF短流程工艺小试装置，研究了该工艺对微污染水源水中有机物的去除效果，并对膜污染特性进行了综合评价。结果表明，在保证DOC和UV254去除效果的前提下，PAC的最佳投加量为50 mg/L、最佳吸附时间为2 h；在最佳投加量下，PAC吸附时间从10 min增至120 min时，UF膜的可逆污染阻力由5.91×1011 m-1降至5.20×1011 m-1；在最佳吸附时间内，PAC投加量从25 mg/L增至100 mg/L时，UF膜的可逆污染阻力由5.70×1011 m-1降至5.12×1011 m-1。通过对PAC吸附前后原水的分子质量分布、亲疏水性以及三维荧光进行测定，初步揭示了PAC缓解膜污染的机理，PAC吸附主要通过去除疏水性小分子有机物和腐殖酸等大分子有机物引起的不可逆污染来缓解膜污染。
- 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.
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