Recovery of FeCl3 coagulant by acid digestion and Nafion 117 membrane method and its environmental and biological evaluation

Document Type : Research Paper

Authors

Department of Environmental Sciences and Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran

10.22124/cjes.2024.7597

Abstract

Coagulant materials are usually expensive and the purchase, transportation, and maintenance costs are high for all water treatment plants. The disposal of sludge resulting from used coagulants also requires knowledge-based management, and it is necessary to foresee scientific and economic points of view for the disposal of sludge resulting from coagulants in the environment. The present study aimed to design cost-effective and simple Ferrum-based coagulants. So, Fe3+ was recovered through acid digestion and the Nafion 117 membrane, then these methods efficiency was compared together. The present study showed that the average recovery rates (%) of Fe3+ by acid digestion and Nafion 117 membrane were 73% and 71.5% after 30 and 25 min, respectively. Also, the ratio of return sludge to sulfuric acid was 40:60 during the acid digestion method. According to the results, the Nafion 117 membrane in addition to a significant effect in reducing the concentration of FeCl3 in wastewater did not release sulfuric acid, meaning that reducing the disposal of chemical sludge by Nafion 117 has not environmental negative effects, and can prevent the biological and physical degradation of farms.

Keywords

References

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Caspian Journal of Environmental Sciences

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Available Online from 22 February 2024

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