Toxicity effects of formaldehyde on methanol degrading sludge and its anaerobic conversion in Biobed expanded granular sludge bed (EGSB) reactors
| Autor: | G. Gonzalez-Gil, A. C. van Aelst, Gatze Lettinga, Robbert Kleerebezem, G. R. Zoutberg, A. I. Versprille |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Laboratorium voor Plantencelbiologie
Environmental Engineering Methanogenesis Formaldehyde Biomass Bacterial growth biodegradatie biodegradation chemistry.chemical_compound anaërobe behandeling Bioreactor anaerobic treatment Water Science and Technology toxiciteit Chromatography WIMEK afvalwaterbehandeling toxicity Biodegradation sludges Laboratory of Plant Cell Biology chemistry Wastewater waste water treatment Environmental chemistry Environmental Technology formaldehyde Milieutechnologie Methanol slib |
| Zdroj: | Water Science and Technology 40 (1999) 8 Water Science and Technology, 40(8), 195-202 |
| ISSN: | 0273-1223 |
| DOI: | 10.1016/s0273-1223(99)00626-5 |
| Popis: | Methanogenesis from formaldehyde mainly occurred via intermediates as confirmed by the increased concentrations of methanol and H2 in the liquid and gas phases respectively during formaldehyde conversion. While formaldehyde was readily transformed, the methane production rate was immediately and strongly inhibited. Formaldehyde toxicity was in part reversible since the methane production rate recovered after formaldehyde depletion. This recovery can not be explained by biomass growth. The toxicity of formaldehyde was also in part irreversible, since the degree of recovery was not complete. This loss in the methane production rate likely can be attributed to biomass decay as suggested by its linear relation with the amount of formaldehyde dosed, as well as by scanning electron microscopy observations. The addition of the same amount of formaldehyde either in a slug or in a continuous mode caused the same loss in the methane production rate. Thus for the treatment of formaldehyde-containing streams, a balance between loss in the rate (formaldehyde-related decay) and bacterial growth should be attained. By combining good biomass retention and internal dilution of the wastewater, industrial streams containing formaldehyde can still be treated anaerobically. |
| Databáze: | OpenAIRE |
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