| SPG膜表面润湿性对膜污染和化学耐受性的影响 |
| 摘要点击 2050 全文点击 971 投稿时间：2014-10-25 修订日期：2014-12-22 |
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| 中文关键词 微气泡曝气 SPG膜 表面润湿性 膜污染 化学耐受性 |
| 英文关键词 microbubble aeration SPG membrane surface wettability membrane fouling chemical durability |
| 作者 | 单位 | E-mail | | 张静 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018
北京工业大学建筑工程学院, 北京 100022 | zhangjing1129@163.com | | 肖太民 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | | | 张晶 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | | | 曹丽亚 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | | | 杜亚威 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | | | 刘春 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | liuchun@hebust.edu.cn | | 张磊 | 河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018 | |
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| 中文摘要 |
| SPG膜微气泡曝气系统可应用于废水好氧处理,SPG膜污染以及其对化学清洗的耐受性是影响其应用的重要因素. 本研究在采用在线化学清洗的微气泡曝气生物膜反应器中,考察了SPG膜表面性质对膜污染及化学耐受性的影响. 结果表明,在长期运行过程中,SPG膜表面润湿性对膜污染和化学耐受性具有明显影响. 膜表面污染层主要是有机污染,而疏水性膜抗有机污染能力较强. 使用在线化学清洗时,碱性次氯酸钠溶液对亲水性膜腐蚀严重,膜孔径和孔隙率显著增大. 疏水性膜抗碱性次氯酸钠溶液化学腐蚀能力较强,膜孔结构仅有轻微改变,但是疏水性膜表面疏水官能团易被氧化,使得膜表面润湿性下降. 同时,疏水性膜在氧传质、污染物去除和降低能耗等方面具有优势. 因此,疏水性SPG膜适用于微气泡曝气废水好氧生物处理. |
| 英文摘要 |
| Shirasu porous glass (SPG) membranes have been applied for microbubble aeration in aerobic wastewater treatment. In the present study, both hydrophilic and hydrophobic SPG membranes were used in a microbubble-aerated biofilm reactor with online chemical cleaning, and their membrane fouling and chemical durability were determined to be strongly dependent on the membrane wettability. The fouling layer formed on the surface of both membranes was confirmed to be mainly organic fouling, and the hydrophobic membrane showed a relatively stronger resistance to the organic fouling. The severe chemical corrosion of the hydrophilic membrane was observed due to exposure to the alkaline sodium hypochlorite solution used for chemical cleaning, which resulted in significant increases in the median pore diameter and the porosity. On the other hand, the pore structure of the hydrophobic membrane changed slightly when exposed to the alkaline sodium hypochlorite solution, suggesting its strong alkali-resistance due to the non-wetting surface. However, the surface hydrophobic groups of hydrophobic membrane could be oxidized by sodium hypochlorite solution, resulting in more wettable membrane surface. The hydrophobic membrane also showed better performance in the respects of oxygen transfer, contaminant removal and energy-saving. Therefore, the hydrophobic membrane seemed more appropriate to be applied for microbubble aeration in aerobic wastewater treatment process. |
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