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Wastewater Treatment by Composite Chitosan as Biosorbent for Repulped Papermaking Plants

YAO Shu-hua~1,SHI Zhong-liang~2, SONG Shou-zhi~1 (1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110004, China; 2. Department of Applied Chemistry, Shenyang Institute of Chemical Technology, Shenyang 110142, China. )  
The wastewater treatment for repulped papermaking plants using chitosan and its compasite chitosan as biosorbents is studied. The effects of pH value, chitosan dosage, stiring speed and resting time on COD removal rate are investigated to obtain the optimal experimental conditions, i.e., pH value range of wastewater:6.5~6.7, stiring speed:120?rpm, resting time:12?hr and chitosan dosage:0.4?g/L. Under the conditions the COD removal rate of wastewater can be over 66%. The results show that the chitosan is obviously superior to the non-organic flocculant Al_2(SO_4)_3 in biosorption process. Moreover, the chitosan can be used further by combining it with Al_2(SO_4)_3 in a certain proportion to form a new composite purificant or biosorbent to wastewater treatment for repulped papermaking plants, by which the COD removal rate can be up to 83% even more. It will not only improve the COD removal rate but avoid secondary pollution, with better environment protection effect available.
【Fund】: 国家"十五"科技攻关项目(2001BA609A 10)
【CateGory Index】: X703
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