Decolorization of dyeing wastewater with use of chitosan materials |
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| Authors: | Chen Xin Sun Hui-li Pan Jia-hui |
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| Institution: | (1) South China Sea Institute of Oceanlogy, The Chinese Academy of Science, 510301 Guangzhou, China;(2) Graduate University of Chinese Academy of Science, 100049 Beijing, China;(3) Department of Chemistry and Chemical Engineering, Foshan University, 528000 Foshan, China |
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| Abstract: | More attention has been paid to the research on decolorization of dyeing wastewater nowadays. In this study, an investigation
into the decolorization of dyeing wastewater was conducted using a combination of coagulant, carboxymethyl chitosan (NOCC)
and coagulant aid, polyscrylamide (PAM). The factors influencing the decolorization efficiency, such as pH value, coagulant
and the dosages of coagulant, were discussed. The results showed that using PAM as coagulant aid could reach a high decolorization
efficiency compared with using NOCC alone. The optimal conditions were pH 2.3, 480 mg/L for NOCC, and 4–8 mg/L for PAM. Under
the optimum conditions, the rate of decolorization could achieve 99%, and the removal of chemical oxygen demand (COD) could
achieve 90%. In addition, the membrane processes with chitosan/rare-earth-metals could enhance the decolorization rate of
Direct Black FF to 94.7%, and Indanthren Red F3B to 98.2%, respectively. Key words - Carboxymethyl chitosan, PAM, Dyeing wastewater,
Decolorization, Chitosan/rare-earth membrane |
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