Biocatalytic dechlorination of lindane by nano-scale particles of Pd(0) deposited on Shewanella oneidensis

• Published in: Chemosphere (Oxford) Vol. 66; no. 1; pp. 99 - 105
• Main Authors: Mertens, Birgit, Blothe, Christian, Windey, Kim, De Windt, Wim, Verstraete, Willy
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2007; Elsevier
• Subjects: Applied sciences; Biocatalysis; biocatalysts; Biodegradation, Environmental; Biological and physicochemical phenomena; Biomass; BioPd; Bioreactors; Bioreactors - microbiology; biotransformation; Catalysis; catalysts; chemistry; Chlorine; Chlorine - chemistry; Chlorine - metabolism; dechlorination; Exact sciences and technology; growth & development; Hexachlorocyclohexane; insecticide residues; lindane; Lindane - chemistry; Lindane - metabolism; Membrane reactor; metabolism; microbiology; Molecular Structure; Nanostructures; Nanostructures - chemistry; Natural water pollution; Palladium; Palladium - chemistry; Palladium - metabolism; Pollution; Reductive dechlorination; Shewanella; Shewanella - growth & development; Shewanella - metabolism; Shewanella oneidensis; wastewater treatment; Water treatment and pollution; γ-hexachlorocyclohexane; Membrane reactor; Palladium; γ-hexachlorocyclohexane; Biocatalysis; Reductive dechlorination; BioPd; Insecticide; Nanoparticle; Zerovalent metal; Supported catalyst; Persistent organic pollutant; Dechlorination; Decontamination; Organochlorine compounds; Bacteria; Organic compounds; Catalytic reaction; Lindane; Pesticides; HCH; Microbial biomass; Organic chlorine compounds; Bioreactor; Vibrionaceae; Water pollution; Nanostructured materials
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2006.05.018

A new approach for the removal of the pesticide lindane (γ-hexachlorocyclohexane or γ-HCH) makes use of catalytic reduction of HCH to benzene over a metal catalyst, namely Pd(0). Since specific surface area plays an important role in reactivity of catalysts, this study investigated the use of bioPd(0), i.e. nano-scale Pd(0) particles precipitated on the biomass of Shewanella oneidensis, for the removal of lindane. It was demonstrated that bioPd(0) has catalytic activity towards dechlorination of γ-HCH, with the addition of formate as electron donor, and that dechlorination with bioPd(0) was more efficient than with commercial powdered Pd(0). The biodegradable compound benzene was formed as reaction product and other HCH isomers could also be dechlorinated. Subsequently bioPd(0) was implemented in a membrane reactor technology for the treatment of γ-HCH polluted water. In a fed-batch process configuration with formate as electron donor, a removal percentage of 98% of γ-HCH saturated water (10 mg l −1) was achieved within 24 h. The measured chloride mass balance approached the theoretical value. The results of this work showed that a complete, efficient and fast removal of lindane was achieved by biocatalysis with bioPd(0).