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The Research on Fluorine Removal of High Fluorine Containing Sewage by Adding Lime ╟polymeric Ferric Sulfate and Its Expense Minimum

Author: GuoGuangYao
Tutor: ZhangJingCheng
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: High concentrations of fluorine-containing wastewater Lime PFS Minimization of costs
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 167
Quote: 4
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Abstract


Due to the development of modern industry, the production and application of fluoride and its compounds are more widely. Many with fluorine industry wastewater often contains high concentrations of fluoride, fluorine-containing ore mining and processing, chemicals, metal smelting, aluminum electrolysis, electroplating, chemical fertilizers, pesticides, etc., and their emissions causing environmental pollution, but will seriously affect human health. Fluorine chemical industry to produce high concentrations of fluorine-containing wastewater treatment technology is not mature, generally there are a large investment in infrastructure, high operating costs, the effect of fluoride removal unstable shortcomings. The topic for the acidic high concentration of fluoride wastewater research the joint lime precipitation and lime polymeric ferric sulfate (PFS) Act fluoride removal, provide an effective treatment method for the treatment of high concentration wastewater containing fluoride. Fluoride removal studies of lime precipitation conditions of experiments to analyze the various factors affecting the effect of fluoride removal, and to explore the mechanism of fluoride removal. Experimental results show that the initial concentration of fluoride ions, lime dosage, pH, reaction time and agitation intensity affect the residual F-concentration in the supernatant, but simply using lime defluorination is not effective fluoride ion concentration is less than 10mg / L. Fluoride removal method combined lime polymeric ferric sulfate (PFS) to get better treatment effect. The conditions of the experimental analysis of factors affecting the effect of fluoride removal individually, the results showed that the polymeric ferric sulfate dosage, pH, reaction time, stirring intensity residual F-concentration in the supernatant. The conditions of experiments on the effect of fluoride removal factor individually, come to the lime the defluoridation the best reaction conditions. Optimal reaction conditions: the lime dosage gt; 8.5g/LpH = 12.5 reaction time = 30min stirring intensity = 400r/min utilization conditions experimental factors influence the effect of fluoride removal by-analysis obtained PFS defluoridation reaction condition. The optimal reaction conditions: PFS dosage gt; the appropriate 6 to 8 1.6mL/LpH in the best reaction time of 6-7 = 10min stirring intensity = 60 to 80r/min so, the use of cost minimization model derived in effluent standards under the circumstances, the minimization of costs under the conditions of the lime-PFS method to deal with the high concentration of fluorine-containing wastewater of the optimal parameters: the period of lime dosage = 7.26g / L while the pH = 9.26 a reaction time = 35min period of agitation strength = 257 r / minPFS dosage = 1.33mL / L, Sec pH = 6.7, Sec reaction time = 14min Sec stirring intensity = the lime-PFS Law 97r/min cost minimization conditions under running costs than the lime-PFS the running costs of the process by about 17%. Defluoridation sewage units run in accordance with the principle of cost minimization process conditions, the emission standards of the fluoride ion concentration from 10mg / L to 5mg / L, its operating costs will increase by 15.4%. Under the total control of the running costs 4.2% less than concentration under the control of the running costs.

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