Research on orthogonal coagulated setting and coagulation-flotation test of tannery wastewater |
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| Authors: | Zhi XU Qingzhi FEI Weilei ZHONG |
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| Institution: | 1. Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, University of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal;2. Transport Phenomena Research Center (CEFT), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal;3. James Weir Fluids Lab, Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, UK;4. Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK;1. Centro de Innovación Aplicada en Tecnologías Competitivas (CIATEC), Dirección de Investigación y Posgrado, Omega-201, Fraccionamiento Industrial Delta, León, 37545 Guanajuato, Mexico;2. Centro de Investigación y Desarrollo Tecnológico en Electroquímica, CIDETEQ, S.C. Parque Tecnológico de Querétaro, Safandila Pedro Escobedo, Qro, C.P. 76703, Mexico;3. Laboratori d’Electroquímica de Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain;1. Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, Koencho 165, Kitami 090-8507, Japan;2. Graduate School of Engineering, Materials, Physics and Energy Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;1. School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, 632014, Tamil Nadu, India;2. Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam;1. Department of Chemistry, Aristotle University of Thessaloniki, GR 54124, Greece;2. Department of Chemical Engineering, Aristotle University of Thessaloniki, GR 54124, Greece |
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| Abstract: | The treatment of the tannery wastewater was studied by orthogonal test of beaker coagulation. FeSO4 and alkaline sodium aluminum waste liquid contained NaOH-NaAlO2 were used as flocculants, with polyacrylamide (PAM) as coagulation. When the dosage of FeSO4 was 2.66 g/L (pH 5.5), the wastewater pH value of adding alkaline sodium aluminum waste liquid was 8, and the dosage of PAM was 1 mg/L, the optimum result was obtained. A test device of co-coagulation flotation reactor was designed on the basis of the conglutination of bubble, flocci and turbulent flotation theory. In the device, the gas-1iuid mixed pump substituted the air compressor and the pressure releaser. The combination of coagulation and air flotation were realized. The pump is a new kind of air saturation equipment. The air compressor and the pressure releaser were used commonly in traditional air flotation device. The results of treatment of the tannery wastewater showed a stable state, when the operating pressure was 5×105 Pa, circumfluence ratio was 225%. |
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