Methanogenic and perchloroethylene-dechlorinating activity of anaerobic granular sludge
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Methanogenic and perchloroethylene-dechlorinating activity of anaerobic granular sludgeData
1998-10Cita bibliográfica
Kennes C, Veiga MC, Bhatnagar L. Methanogenic and perchloroethylene-dechlorinating activity of anaerobic granular sludge. Appl Microbiol Biotechnol. 1998;50(4):484-8. En PDF
Resumo
The biodegradation and toxicity of tetrachloroethylene (C2Cl4) and trichloroethylene (C2HCl3) were studied with different anaerobic enrichment cultures using the following electron donors: acetate, propionate, butyrate, methanol, formate and hydrogen. All of them sustained dechlorination except propionate, for which C2Cl4 biodegradation rates were not significant. The best results were obtained with butyrate. Hydrogen appeared to be a relevant electron donor for dechlorination with the present cultures. In the presence of specific inhibitors such as bromoethanesulphonate or molybdate, a slight inhibition of dechlorination was observed. According to dechlorination kinetics, Monod-type behaviour was observed up to 120 μM C2Cl4 or 200 μM C2HCl3 with K s values around 7 μM for both compounds. Dechlorination was partially inhibited at higher concentrations. In contrast, methanogens, or at least methane production, were more sensitive to the presence of chlorinated ethylenes and inhibition of methanogenesis was observed to different extents over all the C2Cl4/C2HCl3 concentration range tested, even at the lowest concentrations.
Palabras chave
Tetrachloroethylene
Trichloroethylene
Biodegradation
Dechlorination
Methanobacterium
Negibacteria
Anaerobiosis
Trichloroethylene
Biodegradation
Dechlorination
Methanobacterium
Negibacteria
Anaerobiosis
Versión do editor
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The final publication is available at Springer via http://dx.doi.org/10.1007/s002530051324