利用電場奈米過濾及超過濾去除鐵錳砷

許穗蒨

doi:10.6840/CYCU.2011.00512

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利用電場奈米過濾及超過濾去除鐵錳砷

Remove Iron,Manganese and Arsenic by Electro-Nanofiltration and Ultrafiltration

許穗蒨 , Masters　　Advisor：莊清榮　　

繁體中文 DOI： 10.6840/CYCU.2011.00512

鐵；砷；奈米過濾；超過濾；錳； Manganese ； Nano-filtration ； Arsenic ； Ultra-filtration ； Iron

Abstract │ Reference (65) │ Altmetrics

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ABSTRACT
In Taiwan, the groundwater is one of the important water resources for public water supply. Iron and manganese are usually found in the groundwater and the corresponding problems caused by them are highly concerned by the water facility. Iron and manganese are generally removed by oxidation first and then separated by filtration processes.  Another natural contaminant may appear in some area of Taiwan groundwater is arsenic. Because arsenic is highly toxic and very small, coagulation or adsorption coupled with other methods generally are required to remove it.
Recently, membrane processes have been widely used for water treatment to improved water quality. In order to investigate the feasibility by using membrane filtration to purify the groundwater containing iron, manganese and arsenic contaminant, nano-filtration and ultra-filtration were applied in the study to filter the solution containing the contaminants mentioned above. Electric field was imposed on the filter to examine the effect of the external force on the enhancement of the filtration performance.
An nanofiltration membrane, NF-270, and two UF membranes, RC10 kDa and 30 kDa were used for the experiments. The feed solution concentration were prepared as 5mg/l iron or manganese. Experimental results from NF-270 membrane showed that under the operating pressure ranging from 3 to 5 bar the rejections of iron and manganese are higher than 94% and 96%, respectively and are only slightly effected by the applied pressure and the pH used in a range of 6 to 10. However, the filtration flux is decreased obviously with the increased pH. The iron concentration in filtrate can meet drinking water standard of 0.3 mg/L, while the manganese concentration is still not less than the standard 0.05 mg/L. When the feed is an iron and manganese mixed solution, the iron rejection is obviously higher than that from solution only containing iron, while the manganese rejection is nearly the same as that from single manganese solution.
Experimental results by using RC-10 kDa membrane to filter iron and manganese mixed solution showed that the pH and applied electric field strength are only give a very slight effect on the high rejection of iron. The iron concentration in the filtrate meet the drinking requirement. On the contrary , the manganese rejection depend on the pH and electric field strength, the higher pH and electric field strength applied the higher rejection obtained.
As for arsenic filtration, RC-30 and 10 kDa UF membranes were first used to filtrate 1 mg/L pentavalent arsenic (As(V)) solution under pH6. Experimental results showed that the 30 kDa membrane gives a very low rejection even under a high electric field strength as 4000 V/m. Although the 10 kDa membrane can provide a higher rejection of As(V) as 82% when electric field strength is 4000 V/m, the As(V) concentration in filtrate is still not meet the drinking water quality standard, Taiwan.
When the groundwater containing As(V)<3mg/L is filtrate by NF-270 membrane with electric field, under the conditions of pH larger than 8 and electric field strength higher than 4000 V/m the filtrate will has a As(V) concentration lower than the drinking water standard.

Reference ( 65 ) 〈TOP〉

Annalisa De Munari and Andrea I. Schäfer,” Impact of speciation on removal of manganese and organic matter by nanofiltration,” Journal of Water Supply: Research and Technology, 59, 152-163 (2010).
連結：
Auddy, K., Sirshendu De and Sunando DasGupta, “Performance prediction of turbulent promoter enhancednanofiltration of a dye solution,” Separation and Purification Technology, 43, 85-94 (2005).
連結：
Bandini, S., Jennifer Drei and Daniele Vezzani, “The role of pH and concentration on the ion rejection in polyamide nanofiltration membranes,” Journal of Membrane Science, 264, 65-74 (2005).
連結：
Boussu, K., Y. Zhang, J. Cocquyt, P. Van der Meeren, A. Volodin, C. Van Haesendonck, J. A. Martens and B. Van der Bruggen, “Characterization of polymeric nanofiltration membranes for systematic analysis of membrane performance,” Journal of Membrane Science, 278, 418–427 (2006)
連結：
Boussu, K., C. Vandecasteele and B. Van der Bruggen, “Relation between membrane characteristics and performance in nanofiltration,” Journal of Membrane Science, 310, 51–65 (2008).
連結：

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