title: Research on orthogonal coagulated setting and coagulation-flotation test of tannery wastewater.
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 5×10(5) Pa, circumfluence ratio was 225%.
authors.affiliation: School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China. zhixu638@163.com
authors.forename: Zhi
authors.initials: Z
authors.lastname: Xu
authors.forename: Qingzhi
authors.initials: Q
authors.lastname: Fei
authors.forename: Weilei
authors.initials: W
authors.lastname: Zhong
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D005290:Ferric Compounds / Q000737:chemistry; D005427:Flocculation; D059027:Recycling; D013633:Tanning; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D005290:Ferric Compounds; D062065:Wastewater; D000099166:Polyacrylamides; C024823:ferric sulfate