Study of the coagulation process in wastewater treatment of dairy industries

Document Type : Original Article

Authors
Mahshid Loloei 1
Hosein Alidadi 2
Gholamabbas Nekonam 1
Yousef Kor 3
1 Environmental Health Research Center, Department of Environmental Health Engineering, Faculty of Health, Kerman University of Medical Sciences, Kerman, Iran
2 Department of Environmental Health Engineering, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran
3 Gomishan Health Center, Golestan University of Medical Sciences, Gorgan, Iran
10.4103/2277-9183.132684
Abstract
Aims: In this study, the effect of the coagulation process on treatment of simulated dairy wastewater (SDW) was investigated using the mineral and organic coagulants. Materials and Methods: Different types of coagulants such as inorganic (Alum and ferrous sulphate) and polymeric coagulants (polyacrylamide [PAA] and polyferric sulphate [PFS]) were investigated. Inorganic coagulants dosages were varied from 100 to 1000 mg/L and the polymers dosage was 20 mg/L. Turbidity, chemical oxygen demand (COD), electrical conductivity (EC) and chloride of samples were investigated in optimum pH. Results: Both two coagulants had an optimum dose and pH of 1000 mg/L and 5 respectively. According to the findings, Alum with 95% turbidity removal and 68% COD removal had more high efficiency than ferrous sulphate (95% and 62% efficiency for turbidity and COD removal respectively). When Alum via PFS and PAA as a coagulants aid were used, 82% decrease in COD was obtained using low dose of Alum (100 mg/L). Conclusion: In studied dairy wastewater, Alum was more effective than ferrous sulphate. Addition of 20 mg/L of both two coagulants aid (PFS and PAA) effectively reduced the use of Alum and it was effective in COD removal.
Keywords
Alum
dairy industries
ferrous sulphate
polyferric sulphate
polyacrylamide
wastewater
International Journal of Environmental Health Engineering (IJEHE)
Volume 3, May
Spring 2014
Pages 17-21

  • Receive Date 02 February 2023