A study of electrically enhanced membrane process on the treatment of textile wastewater
Date Issued
2006
Date
2006
Author(s)
Tsai, Ping-Yen
DOI
zh-TW
Abstract
Abstract
The propose of the study to combine the electric driving force and membrane process to enhance the performance of ultrafiltration(UF) system. An experiment who conducted to evaluate the electrically enhanced ultrafiltration was a synthetic dye solution. Acid red 4, acid orange 10 and Acid red 27 were used in the experiment to prepare the synthetic dye and salt mixtures.While treating the waste water of synthesized dye by UF under the application of electric field, the increase of filtration flux would be resulted with the augmentation of the intensity in electric field.The Acid red 27 dye with higher valence number has stronger electrophoresis mobility, and has higher efficiency on the removal of color and organic substances. Under higher pH, dye has stronger electrophoresis mobility and better treatment efficiency. Due to the electrophoresis effect induced by the applied electric field, the fouling resistance of membrane could reduce total fouling resistance and irreversible resistance effectively. The flux of filtration and the intensity of electric field have positive correlation, and the critical electric field is the key to the operation condition revelant to the flux. As for the efficiency in the elimination of color and organic substances were increased with higher of E/Ec, so the ratio of effective electric field(E) to critical electric field(Ec) is meaningful in the process of applied electric field.
In the process of electro-membrane filtration, the applied operation condition and membrane do not have significant electroosmosis effect through related experiment. Under the operation of 98KPa pressure, only 6% flux was increased, which showed the increase of flux in the applied electric field process mainly from electrophoresis effect. The effect of dye filtration by membrane is mostly influenced by the basic nature of dye, including size of molecular weight, electrophoresis motility and the adsorbability of dye to membrane.
As compared the electro-membrane filtration treatment in synthesized dye waste water with the textile waste water, it showed the TDS increased substantially in textile waste water due to chemical addition in production and coagulation processes. As a result there is the phenomenon of over electric conductivity content in the process of electro-membrane filtration,and a significant electricity is consumed in order to critical electric field.Also, the consequeuce is that the electro-filtration becomes an uneconomical process. According to the preliminary economical analysis by this research, the electro-membrane filtration process has an economic advantage over the ordinary membrane process, when the dye-containing waste water has low electric conductivity and high electrophoresis mobility.
Subjects
合成染料廢水
外加電場薄膜程序
電泳
電滲透
Synthetic dye wastewater
the process of electro-membrane filtration
electrophoresis
electroosmosis
SDGs
Type
thesis
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