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The Effect of Various Modification on Adsorption Performance of Screening Reject from Wood Chips
  
DOI:10.11980/j.issn.0254-508X.2018.08.005
Key Words:wood screening reject  removal efficiency  modify  Cr(VI)  adsorption
Author NameAffiliation
MENG Xiang-mei Tianjin Key Lab of Pulp & Paper Paper College of Tianjin University of Science & Technology Tianjin 300457 
WAN Yue-liang Tianjin Key Lab of Pulp & Paper Paper College of Tianjin University of Science & Technology Tianjin 300457 
FENG Kun Tianjin Key Lab of Pulp & Paper Paper College of Tianjin University of Science & Technology Tianjin 300457 
KONG Hua-zheng Tianjin Key Lab of Pulp & Paper Paper College of Tianjin University of Science & Technology Tianjin 300457 
LIU Ting-zhi* Tianjin Key Lab of Pulp & Paper Paper College of Tianjin University of Science & Technology Tianjin 300457 
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Abstract:Wood chips screening reject containing sawdust and wood needles is a waste in pulp wood raw material preparation process, functional modification of screening reject was studied by using nitric acid, phosphoric acid and sodium hydroxide, respectively, the effects of three kinds of modification methods on the adsorption of chromium ions in chromium-containing wastewater onto the modified reject were discussed.The reject was modified by 1 mol/L nitric acid, phosphoric acid and sodium hydroxide respectively for 2 h in 30℃ and oscillating with 200 r/min, the adsorption performances of Cr(VI)by three modified samples were studied. The results showed that the adsorption efficiency was the best when the initial concentration of chromium(VI) was 15 mg/L, the amount of wood screening reject was 40 g/L, adsorption pH=2, adsorption temperature was 30℃, and adsorption time was 80 min.The removal rates of chromium(VI) by three modified wood screening rejects were over 70%.The adsorption efficiency of nitric acid modified wood screening reject was the best,and the removal rate of chromium(VI) could reach 93.8%.
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