首页|Groundwater chromate removal by autotrophic sulfur disproportionation
Groundwater chromate removal by autotrophic sulfur disproportionation
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Chromate[Cr(Ⅵ)]contamination in groundwater is a global environmental challenge.Traditional elemental sulfur-based biotechnologies for Cr(Ⅵ)removal depend heavily on the synthesis of dissolved organic carbon to fuel heterotrophic Cr(Ⅵ)reduction,a bottleneck in the remediation process.Here we show an alternative approach by leveraging sulfur-disproportionating bacteria(SDB)inherent to groundwater ecosystems,offering a novel and efficient Cr(Ⅵ)removal strategy.We implemented SDB within a sulfur-packed bed reactor for treating Cr(Ⅵ)-contaminated groundwater,achieving a notable removal rate of 6.19 mg L-1 h-1 under oligotrophic conditions.We identified the chemical reduction of Cr(Ⅵ)via sulfide,produced through sulfur disproportionation,as a key mechanism,alongside microbial Cr(Ⅵ)reduction within the sulfur-based biosystem.Genome-centric metagenomic analysis revealed a symbiotic relationship among SDB,sulfur-oxidizing,and chromate-reducing bacteria within the reactor,suggesting that Cr(Ⅵ)detoxification by these microbial communities enhances the sulfur-disproportionation process.This research highlights the significance of sulfur disproportionation in the cryptic sulfur cycle in Cr(Ⅵ)-contaminated groundwater and proposes its practical application in groundwater remediation efforts.
Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology,School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou,510275,China
Institute of Marine Science and Technology,Shandong University,Qingdao,Shandong,266237,China
Guangdong Provincial International Joint Research Center on Urban Water Management and Treatment,Sun Yat-sen University,Guangzhou,China
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