Technical Papers
Jul 22, 2015

Optimization of Sodium Hydrosulfide Synthesis for Metal Recovery from Wastewater Using Flue Gas Containing H2S

Publication: Journal of Environmental Engineering
Volume 142, Issue 9

Abstract

Sodium hydrosulfide (NaSH), which is utilized for recovering rare metals, was synthesized in a laboratory-scale batch reactor by absorbing a simulated flue gas containing H2S into NaOH solution. The effects of H2S flow rate, NaOH concentration, and reaction time on the synthesis of NaSH were examined. With an increase in the H2S flow rate, the absorption ratio, conversion ratio, and total NaSH productivity showed a decreasing tendency. On the other hand, a higher concentration of NaSH could be synthesized with a higher concentration of NaOH. Most of the Na2S (the intermediate product) were produced at a pH>12, and the NaSH synthesis reaction was feasible at a pH 11.5. Contrary to the increased H2S flow rate, increased NaOH concentration resulted in an enhanced Na2S/NaSH ratio. With a maximum equivalent ratio of NaOH/H2S at 0.88, the chemical composition of the product could maintain equilibrium with the highest NaSH concentration and less than 1% weight-to-weight ratio (w/w) Na2S concentration.

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Acknowledgments

Financial support for this research (Grant No. 20100300006-01) was received from KICOX and the Ministry of Knowledge Economy, South Korea, for the eco-industrial park (EIP) transition in Ulsan Mipo-Onsan national industrial complexes.

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Go to Journal of Environmental Engineering
Journal of Environmental Engineering
Volume 142Issue 9September 2016

History

Received: Dec 3, 2014
Accepted: May 4, 2015
Published online: Jul 22, 2015
Discussion open until: Dec 22, 2015
Published in print: Sep 1, 2016

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Authors

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Researcher, Center for Clean Technology and Resource Recycling, Univ. of Ulsan, Ulsan 680749, South Korea. E-mail: [email protected]
Shishir Kumar Behera [email protected]
Professor, Dept. of Chemical Engineering, GMR Institute of Technology, Rajam, Andhra Pradesh 532127, India. E-mail: [email protected]
Yousuf Jamal [email protected]
Assistant Professor, Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National Univ. of Sciences and Technology, Islamabad 44000, Pakistan. E-mail: [email protected]
Hung-Suck Park [email protected]
Professor and Director, Center for Clean Technology and Resource Recycling, Univ. of Ulsan, Ulsan 680749, South Korea (corresponding author). E-mail: [email protected]

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