研究微滤膜过滤阻力机理及其通量的变化是该工艺应用推广需要解决的关键.以Langmuir理论和Darcy定律为基础,从理论上证实了浓度极化阻力与凝胶层阻力是同一性质的阻力,并通过Langmuir关系式统一起来,推导了微滤膜过滤阻力的数学模型.然后采用一体式膜过滤反应器过滤乳化油实验对该模型进行了验证.实验结果与膜过滤阻力模型拟合得很好(R~2=0.991 2),膜表面极化浓度与相对过滤压差成线性关系,比例系数为凝胶层浓度.基于Langmuir理论的微滤膜过滤阻力模型能真实反映凝胶层阻力的形成过程.用该模型得到的沉积平衡系数Φ反映了混合液的浓度、颗粒大小、温度和黏度等过滤特性,并把极限通量J_(Vlim)与混合液过滤特性联系起来,极限通量与过滤压差无关.
The filtration resistance mechanism and the flux change of micro-filtration membrane are the key problems for the application of the technology.Based on the Langmuir adsorption theory and the Darcy law, it was confirmed that the concentration polarization resistance and the gelatin layer resistance were identical resis-tance in nature, and correlated them by the Langmuir relationship.And then the mathematical model of micro -filtration resistance has been established.The experiments of filtration emulsified oil in the integrated membrane filtration reactor were conducted to examine the filtration resistance model.The results indicated that the filtra-tion resistance model and the experimental results fit quite well (R~2 = 0.991 2) .The membrane surface polar-ization concentration was positively correlated with the relative operation pressure, and the ratio factor was the gelatin level concentration Micro-filtration resistance model based on the Langmuir adsorption theory can re-flect the forming process of the gelatin level resistance effectively.Sedimentation equilibrium coefficient Φ, which was obtained from this model, reflected the mixed-liquor filtration characteristics such as particle size, concentration, temperature and viscosity.The limit flux and mixed-liquor filtration characteristics have been related by Φ, and the results showed that the limit flux had no relation with the filtration pressure.
参考文献
| [1] | 许振良;马炳荣.微滤技术与应用[M].北京:化学工业出版社,2005:33-38. |
| [2] | Trouve E;Urbain V;Manem J .Treatment of muniapal wastewater by membrane bioreactor:results of a semi-industrial pilot-scale study[J].Water Science and Technology,1994,30(04):151-157. |
| [3] | 宋航;付超;石炎福 .微滤过程阻力分析及过滤速率[J].高校化学工程学报,1999,13(04):315-322. |
| [4] | 时钧;袁权;高从堵.膜技术手册[M].北京:化学工业出版社,2001:135-139. |
| [5] | Bolton G;LaCasse D;Kuriyel R .Combined models of membrane fouling: Development and application to microfiltration and ultrafiltration of biological fluids[J].Journal of Membrane Science,2006(1/2):75-84. |
| [6] | A.L. Lim;Renbi Bai .Membrane fouling and cleaning in microfiltration of activated sludge wastewater[J].Journal of Membrane Science,2003(1/2):279-290. |
| [7] | 王湛,武文娟,张新妙,刘德忠.微滤膜通量模型研究进展[J].化工学报,2005(06):972-980. |
| [8] | B. Keskinler;E. Yildiz;E. Erhan;M. Dogru;Y.K. Bayhan;G. Akay .Crossflow microfiltration of low concentration-nonliving yeast suspensions[J].Journal of Membrane Science,2004(1/2):59-69. |
| [9] | T.W.Cheng... .Resistance analyses for ultrafiltration in tubular membrane module[J].Separation Science and Technology,1997(16):2623-2640. |
| [10] | Mulder M;李琳.膜技术基本原理[M].北京:清华大学出版社,1999:270-273. |
| [11] | 杨琦,黄霞,尚海涛,文湘华,钱易.分置式膜-生物反应器凝胶层膜污染模型研究[J].环境科学,2006(11):2344-2349. |
| [12] | 林红军,陆晓峰,段伟,沈飞.膜生物反应器中膜过滤特征及膜污染机理的研究[J].环境科学,2006(12):2511-2517. |
| [13] | 王学松.现代膜技术及其应用指南[M].北京:化学工业出版社,2005:631-634. |
| [14] | 王北福,于水利,镇祥华,荆国林.超滤处理含聚污水过程中通量衰减机理的研究[J].环境科学学报,2007(04):568-574. |
| [15] | 封莉,张立秋,马放,王宝贞.膜堵塞机理研究与膜阻力测定[J].环境工程,2002(03):75-77. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%