Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > Light industrial waste disposal and comprehensive utilization > Paper Industry

Preparation of Chitosan Derivatives and Their Application of Treatment with the Waste Water from the Middle Process in Making Paper

Author ChenLuSheng
Tutor ChenDeZhan;HaoJingCheng
School Shandong Normal University
Course Physical and chemical
Keywords Flocculant Chitosan and its derivatives Preparation conditions Application Paper Mill Wastewater Handle
CLC X793
Type Master's thesis
Year 2004
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The papers include the two aspects of the conditions of preparation of chitosan and its derivatives and their use in papermaking midcourse wastewater treatment. Chitosan (Chitosan) is a straight-chain polysaccharide of glucosamine formula (C 6 H 11 NO 4 ) n, with is very similar to the chemical structure of the cellulose by deacetylated chitin (Chitin) in the system. Chitosan is a translucent flaky solid, alkaline, due to the molecule with a group-NH 2 was dissolved in of many dilute acid (such as formic acid, acetic acid, hydrochloric acid) . The presence of strong hydrogen bonds between the chitosan molecules, are generally insoluble in the organic solvent, and dissolved in a strong acid molecules may be degraded. Chitosan is a straight-chain polysaccharide polymer compounds containing an amino group and a hydroxyl group, can occur the hydrolysis, hydroxymethyl, sulfonation, oxidation, complexation, and condensation reaction. Chitosan in the presence of a free amino group, having a cationic polyelectrolyte nature, and can be directly used as flocculant, may also be used modified aftercrop flocculant. Since the chitosan is mainly used under acidic conditions, its scope of application is very restricted. In order to expand the scope of its application, we chemically modified chitin and chitosan for the mother prepared a fully water-soluble chitosan, O-carboxymethyl chitosan, O-carboxymethyl chitin and other water-soluble nature of the anion and cation flocculant, and find out the best preparation conditions. Chitosan series derivatives prepared can be separately used as flocculants, but also as additives and other flocculants compound used. Its inorganic suspended solids and a variety of organic compounds have good flocculation. The success of this project for the first time to apply the Paper Mill Wastewater treatment achieved the desired effect. In order to facilitate comparison with inorganic flocculants and inorganic polymer flocculant effect, we also synthesized has the different Al 3 / the SO 4 2 - < / sup> the molar ratio of polymeric aluminum sulphate (PACS), and the flocculation effect in the wastewater. Chitosan and its derivatives, aluminum, iron, calcium oxide, polymeric aluminum sulfate and overcast, cationic polyacrylamide flocculant their respective Research Paper Mill Wastewater treatment effect and identify the wastewater treatment suitable pH and coagulant dosage. Flocculation effect and mechanism were discussed. Studies have shown that better than inorganic flocculants Paper Mill Wastewater treatment effect, the effect of flocculation of chitosan and its derivatives, and also better than the overcast, cationic polyacrylamide. They CODcr the removal efficiency of the wastewater from 78 to 85%, suspended solids removal of 63 to 74%, the chroma removal of 50 to 80%. Shandong Normal University, master's thesis to improve wastewater treatment effect, reduce processing costs, chitosan and its derivatives with aluminum sulfate and calcium oxide composite flocculant for wastewater treatment. The experiments show that the effect of the Paper Mill Wastewater treatment is better than when used alone. Among the negative charge of the A13 and wastewater, adsorption of chitosan and its derivatives, bridging coagulation and sedimentation leaving the role of particles in the solution. When the concentration of the chitosan and its derivatives 10 s OPPM, the concentration of aluminum sulfate 300 s ooppm calcium oxide in a concentration of 300 ppm, can wastewater CODcr removal rate of 90, 99%, 78 to 88 percent of the suspended solids removal rate, chroma removal rate of 79 to 95%. Treated wastewater, CODer down to a 72m-year-old L suspended solids concentration was reduced to 25 a 40m-year-old L chroma down to 16 times, all the basic color of the wastewater removal, clear and transparent liquid, water quality of the sewage discharge a standard state regulations. Treatment of Paper Mill Wastewater of the process, with high flocculation efficiency, flocculants with less tractable, alum large CODcr, suspended solids and color removal rate, non-toxic, tasteless, can be biodegradable and treatment of waste water is not many significant characteristics of the generated second pollution. Innovative work of this paper: 1. Systematically studied chitin, chitosan, water soluble chitosan, the O a shuttle methyl chitin, O carboxymethyl chitosan condition, affecting products yield and quality of a variety of reaction conditions were optimized, the industrial production has a guiding role. The first time \Composite flocculant of chitosan and its derivatives of aluminum sulfate and calcium oxide the removal rate wastewater CODer 90 9 , suspended solids removal rate of 78 8 8%, chroma removal rate of 79 to 95%. The flocculant may be biodegradable, the treated waste water does not produce the second pollution. . Systematically chitosan and its derivatives with aluminum, iron, calcium oxide, polymeric aluminum sulfate and overcast, a comparative study of cationic polyacrylamide flocculation effect of the Paper Mill Wastewater. Keywords: Key words: flocculant; chitosan and its derivatives; preparation conditions; application; Paper Mill Wastewater; processing. 0648 Order

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