Document Type : Research article
Author
Department of Biosystems Engineering, Faculty of agriculture, Jahrom University, P.O. Box 74135-111, Jahrom, Iran
Abstract
Background and Purpose: Due to the high pollutant load and high volume of wastewater from starch production factories, the objective of the present study was to evaluate the efficiency of hydrated lime and aluminum sulfate to decrease contaminants of starch wastewater to successful wastewater treatment in the main wastewater treatments plants.
Materials and Methods: The investigation was conducted during 2022 and 2023 over 16 months to improve the operational effectiveness of the wastewater treatment plant at a starch manufacturing factory in Fars province. The optimum dosage of two coagulants, i.e. lime and aluminum sulfate, were tested. Various pollutants were under study, such as chemical oxygen demand and biological oxygen demand, etc. The statistical analysis was conducted in SPSS 22 using Dunkan analysis (α = 0.01).
Results: The effectiveness of removing pollutants was improved while lime and aluminum sulfate rose from 20 mg/L to 40-60 mg/L. The removal efficiency of pollutants was almost constant and enhanced lower than 10% while coagulants were applied higher than 60 mg/L. The optimum lime and aluminum sulfate dosage was 40 mg/L and 20 mg/L, respectively. Following the application of coagulants, there was a notable reduction in the levels of pollutants and organic loading rate by 65% which led to an enhancement in the performance of the wastewater treatment plant.
Conclusion: The coagulation and sedimentation with lime and aluminum sulfate can be utilized for successful starch wastewater treatment. These materials are cost-effective and easily accessible which justifies them as a desirable option for factories seeking wastewater treatment solutions.
Open Access Policy: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/
Keywords
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