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- Title
Biocatalytic dechlorination of hexachlorocyclohexane by immobilized bio-Pd in a pilot scale fluidized bed reactor.
- Authors
Hennebel, Tom; Simoen, Henri; Verhagen, Pieter; Windt, Wim; Dick, Jan; Weise, Christian; Pietschner, Frank; Boon, Nico; Verstraete, Willy
- Abstract
Lindane (γ-hexachlorocyclohexane, γ-HCH) is a recalcitrant and toxic organochlorine insecticide. Due to its non-selective production process and widespread use, HCH isomers and their degradation products have been detected frequently in soils and groundwater. An innovative technology using microbial produced Pd(0) nanoparticles, i.e. bio-Pd, was developed to treat groundwater containing a mixture of HCHs and chlorobenzenes. In a first step, the groundwater was de-ironized and most of the chlorobenzenes were removed in a biological trickling filter. The μg L levels of HCHs and chlorobenzenes were removed in a second step by the bio-Pd-based technology. Therefore, a 200-L pilot scale reactor was developed with 100 mg L bio-Pd encapsulated in alginate beads. Hydrogen gas was bubbled at the bottom of the reactor and served to charge the bio-Pd catalyst. The reactor influent contained 5.2 μg L HCHs and 51.1 μg L chlorobenzenes. During a test period of 10 days, 29% of the HCH isomers and 63% of the chlorobenzenes were removed applying a nominal hydraulic residence time of 4 h. These removal percentages could be increased to 75 and 68% by doubling the nominal hydraulic residence time to 8 h. This study demonstrated that biologically produced nanoparticles of Pd can be applied for the large-scale remediation of groundwater contaminated with HCHs.
- Subjects
ORGANIC compounds; STAINLESS steel; GROUNDWATER pollution; TRICKLING filters; PUMICE
- Publication
Environmental Chemistry Letters, 2011, Vol 9, Issue 3, p417
- ISSN
1610-3653
- Publication type
Article
- DOI
10.1007/s10311-010-0295-x