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Article

Biological Desulfurization of Tannery Effluent Using Hybrid Linear Flow Channel Reactors

1
Department of Chemical Engineering, Bellville Campus, Cape Peninsula University of Technology, Symphony Way, Cape Town 7535, South Africa
2
The Moss Group, 24 Cornuta Avenue, Tokai, Cape Town 7945, South Africa
3
Applied Microbial and Health Biotechnology Institute, Bellville Campus, Cape Peninsula University of Technology, Symphony Way, Cape Town 7535, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Lian-Shin Lin
Water 2022, 14(1), 32; https://doi.org/10.3390/w14010032
Received: 26 November 2021 / Revised: 20 December 2021 / Accepted: 21 December 2021 / Published: 23 December 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
The tanning process generates a saline effluent with high residual organics, sulfate and sulfide concentrations. The transition from a linear to circular economy requires reimagining of waste streams as potential resources. The organics in tannery effluent have the potential to be converted to renewable energy in the form of biogas if inhibitors to anaerobic digestion are removed. Hybrid linear flow channel reactors inoculated with culture-enriched halophilic sulfate reducing bacteria from saline environments were evaluated as a novel pretreatment step prior to anaerobic digestion for the concurrent removal of sulfur species and resource recovery (elemental sulfur and biogas). During continuous operation of a 4-day hydraulic retention time, the reactors were capable of near-complete sulfide oxidation (>97%) and a sulfate reduction efficiency of 60–80% with the formation of a floating sulfur biofilm containing elemental sulfur. Batch anaerobic digestion tests showed no activity on untreated tannery effluent, while the pretreated effluent yielded 130 mL methane per gram COD consumed. View Full-Text
Keywords: anaerobic digestion; biological sulfate reduction; floating biofilm; sulfide oxidation; sulfur recovery anaerobic digestion; biological sulfate reduction; floating biofilm; sulfide oxidation; sulfur recovery
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MDPI and ACS Style

Horn, E.J.; Oyekola, O.O.; Welz, P.J.; van Hille, R.P. Biological Desulfurization of Tannery Effluent Using Hybrid Linear Flow Channel Reactors. Water 2022, 14, 32. https://doi.org/10.3390/w14010032

AMA Style

Horn EJ, Oyekola OO, Welz PJ, van Hille RP. Biological Desulfurization of Tannery Effluent Using Hybrid Linear Flow Channel Reactors. Water. 2022; 14(1):32. https://doi.org/10.3390/w14010032

Chicago/Turabian Style

Horn, Emma J., Oluwaseun O. Oyekola, Pamela J. Welz, and Robert P. van Hille. 2022. "Biological Desulfurization of Tannery Effluent Using Hybrid Linear Flow Channel Reactors" Water 14, no. 1: 32. https://doi.org/10.3390/w14010032

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