Dissertation > Excellent graduate degree dissertation topics show

Hydrolysis and Dechroming of Chrome Shavings and Recycling

Author: YuanWenHui
Tutor: LiHongWei；ZhangLiPing
School: Beijing Institute of Clothing Technology
Course: Textile Chemistry and Dyeing and Finishing Engineering
Keywords: chrome shavings alkali hydrogen peroxide enzyme collagen dechroming
CLC: X794
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 0
Read: Download Dissertation

Abstract


In this paper , alkali, hydrogen peroxide and enzyme were used to dechrome and hydrolyse the shavings containing chrome. An optimal dechroming process was obtained through single factor analysis method and orthogonal.The results show that : Chrome shavings can be hydrolyzed with alkali or hydrolyzed with enzyme after oxidation dechroming using hydrogen peroxide.The collagen products recovered can be used as feed.When the shavings were treated with CaO 7% at 90℃for 6 hours,chromium content in hydrolyzate was 4.63mg/L,collagen recovery was 38%,molecular weight was about 14000 dalton. When the shavings were treated with MgO 7% at 90℃for 6 hours,chromium content in hydrolyzate was 0.53mg/L,collagen recovery was 21%,molecular weight was about 52000 dalton.The Optimize process for hydrolyzed with enzyme after oxidation dechroming using hydrogen peroxide was : the shavings were treated 8 times under ultrasonic condition with 9% H2O2, 3.0% CaO at 50℃for 70 minutes per time.Then the dechromed shavings were treated with 2709 alkaline protease 4% at 60℃for 2 hours. After treated chromium content in hydrolyzate was 1.26mg/L,collagen recovery was 45%,molecular weight was about 3000 dalton.Waste solution produced by Oxidation dechroming can be recycled .Chromium recovery was 85%. Recycled products can be used as retanning agent to enhance value and reduce the hexavalent chromium pollution.

Related Dissertations

  1. Study on the Combustion Character of Black Liquor from NSSC in Fluidized Bed,TK16
  2. Experimental Research on Concretion Characteristics of High Temperature Syngas in Integrated Gasification Combined Cycle System,TM611.3
  3. Studies on Fermentation Optimization, Purification and Enzyme Characteristics of Lipase from Aspergillus Oryzae FS-1,TQ925.6
  4. Directed Evolution of Lipase from Penicillium Expansum FS1884 by Error Prone PCR,Q78
  5. Experimental Study of Porous Composite Materials on the Base of Recycled Concrete Powder-Cement,TU528
  6. Effects of Enzyme/Chemical Agents on Refining of Plant Fiber,TS713
  7. Study on the Preparation of the Low Molecular Weight Fuciodan from Sargassum Henslowianum (C.Agardh) and Anti-tumor Activity,TS254.9
  8. Establishment of ELISA for Detecting Cd-MT of Pteria Penguin and Preliminary Study of ELISA-kit,X835
  9. The alkali fusion recovered from the glass fiber industry waste enrichment of platinum and rhodium metal,X781.5
  10. The Environmental-Friendly Method and Process of Removing Non-Cellulosic Matters from Bamboo for Textile Fiber,TS652
  11. Effects of Different Reconciled Corn Oils on Antioxidative Stress, Lipid Metabolism Enzymes, and Abundance of Immune-related Genes of Broilers,S831.5
  12. Stereoselective Metabolism of Tetrahydropalmatine and Its Effect on Hepatic Drug Metabolism Enzymes,R96
  13. New Technology and Basic Study on the Direet Preparation of PbO Powder from Galena by Selective Leaching Technology,TQ134.33
  14. Research on Anaerobic Fermentation Processing Technology of Dead Tilapia,TS254.4
  15. Assessment of Resistance Risk in Spodoptera Exigua (Hubner) and Spodoptera Litura (Lepidoptera: Noctuidae) to Chlorantraniliprole,S433
  16. Theeffect of Environmental Factor on Rooting Culture of Paeonia Suffruticosa in Vitro,S685.11
  17. Comparative Analysis of Growth, Digestive Enzyme Activities and Pearl-SAC Development Between Two Different Sized Pinctada Martensii during Pearl Culturing,S917.4
  18. The Difference of Proteome Expression of Low Light Stress and Regular Light Recovery on Growth of Maize Seedling,S513
  19. Study on the Mechanism of Night Temperature to Grain Filling of Inferior in Rice,S511
  20. Coparative Analyses of Carbon and Nitrogen Metabolism of Flue-cured Tobacco Growing in Henan and Yunnan,S572
  21. Distribution of Volatile Acid and Volatile Alkali and Its Relationship with Quality Indexes,S572

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Light industrial waste disposal and comprehensive utilization > Leather Industry
© 2012 www.DissertationTopic.Net  Mobile