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.
Highlights
Food processing industries can introduce some serious problems for the environment by producing wastewater with high biological oxygen demand (BOD) and chemical oxygen demand (COD)
The results showed that the maximum removal efficacy by Alum in pH 5 includes 95%, 68%, 92% and 28% for removal of turbidity, COD, nitrate and chloride, respectively
The results showed that the best removal efficacy by ferrous sulphate in pH 5 includes 95% turbidity, 62% COD, 67% nitrate and 67% chloride removal
Summary
Food processing industries can introduce some serious problems for the environment by producing wastewater with high biological oxygen demand (BOD) and chemical oxygen demand (COD). Dairy product industries produce one of the most pollutant wastewaters. This is due to wastewater volume per day and the volume of wastewaters per liter of produced milk (0.2 to 10 L wastewater per liter of produced milk). Wide range of complex ways for treatment of wastewater exists in the wastewater treatment plants. One of the most important subjects related to the food industry wastewaters is quality assurance of discharged effluent.[1]
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