本研究利用具備生物可分解特色的生物高分子聚合物(Biopolymer)幾丁聚醣(Chitosan)改質傳統濾料來過濾含銅溶液。由文獻中可得知幾丁聚醣來自於甲殼類動物如：蝦、蟹等節肢動物，係由幾丁質去乙醯化而形成。經由螯合作用易與重金屬形成配位鍵並吸附重金屬。幾丁聚醣的運用非常廣，包含了食品、醫學、美容、環境…等用途。本實驗利用幾丁聚醣改質濾料過濾含銅溶液後進行反洗回收試驗，探討幾丁聚醣固化石英砂(CCS)及幾丁聚醣固化石英砂並交聯環氧氯丙烷(CCS-ECH)對含銅溶液之吸附效果及不同pH及不同反洗脫附液量的條件下，之回收濃度與濾料老化情形。
在過濾含銅溶液試驗中，使用石英砂(Sand)、幾丁聚醣固化於石英砂(CCS)、幾丁聚醣固化於石英砂並交聯環氧氯丙烷(CCS-ECH)做為濾料，進行過濾試驗，配製銅廢液濃度為100ppm、流量為5ml/min，過濾時間為濃度完全貫穿即出流濃度等於進流濃度時為過濾終點。再以pH3、pH5及100ml與200ml反洗脫附液進行反洗脫附試驗。研究得知，石英砂對於銅離子的吸附能力極低，而其他兩種改質濾料之吸附量能力為CCS比CCS-ECH良好，但由於使用交聯劑的條件下，反洗脫附後CCS-ECH之濾料老化重覆使用的次數上較CCS來的多，相對著也提升了銅的總回收濃度。 Another fully developed field is the use of biological polymers (Biopolymer), such as chitosan and its modification of as an additional or replacement to traditional filter media is employed to treat heavy metal contaminated soil and water. Chitosan can be derived from crustaceans, such as: shrimp, crabs and other arthropods, by the deacetylation of chitin formation. Chitosan is also recognized as a powerful heavy metal chelating agent. Chitosan has been used to manufacture many industrial products such as environmental quality monitoring and treatment media, medicine, cosmetics and consumer goods including food. In this study, adsorption of copper ions using quartz sand (Sand), chitosan cured in quartz sand (CCS), chitosan cured in quartz sand and cross-linked epichlorohydrin (CCS -ECH) as an adsorbent at different backwash solution pH was investigated and evaluated. Copper wastewater concentration of 100ppm flowing at a rate of 5ml/min is used for the filtration and adsorption experiments. HCl solution of pH 3 and pH5 with volumes of 100 ml and 200 ml is used as a backwash solution.
Research reveal quartz sand exhibits the lowest adsorption capacity as compared to the adsorption capacity of CCS and CCS-ECH. In terms of breakthough time, quartz sand also show the fastest time of breakthough of 200 minutes as compared to the 900 minutes breakhtrough time for CCS and CCS-ECH. This is because the cross linking material used for both chitosan-modified media enhanced the coordination between the components and have made the structure of the two adsorbents stronger than ordinary quartz sand. As to the number of times of reuse, CCS-ECH proved to be more economical since at shows the most number of reuse at pH 5 (4 times) and pH 3 (3 times).
