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The Study on Development and Application of Compounded Coagulant CD

Author: ZuoYanJun
Tutor: ChenHuaGuo
School: Chang'an University
Course: Environmental Engineering
Keywords: Composite coagulant Develop Application
CLC: X703.5
Type: Master's thesis
Year: 2005
Downloads: 153
Quote: 0
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Abstract


Water scarcity and pollution of the water treatment technology is increasingly important Coagulation many water treatment method used widely a which coagulant crucial. The research and development of cost-efficient coagulant coagulation technology critical issues. This paper made a comprehensive overview of the type and progress of the coagulant inorganic coagulants Research. The composite coagulant CD research the case of inorganic polymer coagulant, the introduction of iron salts, aluminum salts in the preparation of complex coagulant of both the advantages of both. The test synthesis time, pH value and basicity coagulants performance, determine the best ratio of new synthetic coagulant CD: raw materials (bauxite and calcium aluminate 3:4 Add, g): 26% hydrochloric acid (mL): the the FeCl 3 · 6H 2 O (g) the best ratio 70:100:2; The synthesis time was 2 hours; pH optimum at about 4.0; Basicity is controlled at about 80%. The comparative test results show that the coagulant CD with PAC and PFS: CD-coagulant coagulation effect than the latter, and the same treatment effect, the coagulant dosage of the CD is less than that of the other two; research the use of a coagulant the coagulation effect that cationic coagulant aid for the coagulant; tests and coagulation kinetics determine the best conditions for coagulation experiments obtained: optimal dosage to 150mg / L; optimum pH value is between 6 to 9; temperature range of 5 ° C to 30 ° C, the best conditions for the hydraulic quick stir speed 300r/min, fast stir 2 min slow stirring speed 125r/min, slow stirring time 1min. Fourier transform infrared scan spectra: the coagulant CD polymer constituted by a variety of elements; coagulation mechanism is electrical and polymer adsorption bridging role. The article also composite coagulant CD the practical application of research and economic evaluation. Dyeing wastewater COD removal efficiency of 71%, chroma removal rate of 85%; the papermaking wastewater COD and SS removal rate of 85% and 74%, high turbidity water turbidity can dropped from 368NTU to minimum 8NTU. Oily wastewater with coagulant the CD processing this experiment, the cost of 0.15 yuan / ton, respectively, than the PAC and PFS save 0.16 yuan / ton and 0.12 yuan / ton, the CD is more economical and practical. Thus indicating that the the coagulant CD has actual application value.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Additives
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