CHANG Xin-qiang,LIN Tao,CHEN Wei,et al.PAC/PS Pretreatment Process for Removal of Cadmium from Water and Control of Ultrafiltration Membrane Fouling[J].China Water & Wastewater,2022,38(1):64-69.
PAC/PS预处理对水中镉的去除及UF膜污染控制
- Title:
- PAC/PS Pretreatment Process for Removal of Cadmium from Water and Control of Ultrafiltration Membrane Fouling
- Keywords:
- powdered activated carbon; persulfate; cadmium; natural organic matter; ultrafiltration; membrane fouling
- 摘要:
- 采用粉末活性炭耦合过硫酸盐（PAC/PS）作为超滤的预处理工艺，考察其对原水中镉和天然有机物的去除效果，以及对超滤膜污染控制的影响。结果表明，对于镉超标6 倍的原水水样，当PAC和PS投加量分别为30 mg/L和300 μmol/L、接触时间为60 min时，UV254、DOC和镉的去除率分别可达到91.7%、68.2%和92.7%，镉浓度可降至《生活饮用水卫生标准》（GB 5749—2006）规定的限值（5 μg/L）以下；与直接超滤相比，设置PAC/PS预处理工艺后超滤膜比通量提升了50.5%，XDLVO预测模型中胶体污染物-超滤膜相互作用的总界面能降低了75.38%，超滤膜污染减轻。
- Abstract:
- Powdered activated carbon coupled with persulfate (PAC/PS) was employed as the pretreatment process of ultrafiltration, and its effects on cadmium and natural organic matter removal in raw water and ultrafiltration membrane fouling control were investigated. For raw water samples in which cadmium exceeded 6 times of the standard value, the removal efficiencies of UV254, DOC and cadmium were 91.7%, 68.2% and 92.7% respectively when the contact time was 60 min and the dosage of PAC and PS were 30 mg/L and 300 μmol/L, and the cadmium concentration could be reduced to the limitation of 5 μg/L specified in Standards for Drinking Water Quality (GB 5749-2006). Compared with direct ultrafiltration, after setting the PAC/PS pretreatment process,the specific flux recovery rate of ultrafiltration membrane was increased by 50.5%, and the total interface interaction energy between colloid pollutants and UF membrane predicted by XDLVO model was reduced by 75.38%, indicating that ultrafiltration membrane fouling was alleviated.
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