期刊
ENVIRONMENTAL CHEMISTRY LETTERS
卷 9, 期 3, 页码 417-422出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10311-010-0295-x
关键词
Hexachlorocyclohexane; Chlorobenzenes; Nanomaterials; Pump and treat; Dechlorination; Palladium
资金
- Bauer Umwelt GmbH and Pion technologies
- Scientific Research-Flanders (Fonds voor Wetenschappelijk Onderzoek (FWO) Vlaanderen) [7741-02]
Lindane (gamma-hexachlorocyclohexane, gamma-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 mu g L-1 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-1 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 mu g L-1 HCHs and 51.1 mu g L-1 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.
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