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Removal of geosmin and MIB by biofiltration - An investigation discriminating between adsorption and biodegradation

Frank Persson ; Gerald Heinicke (Institutionen för bygg- och miljöteknik) ; T. Hedberg ; Malte Hermansson ; W. Uhl
Environmental Technology (0959-3330). Vol. 28 (2007), 1, p. 95-104.
[Artikel, refereegranskad vetenskaplig]

Geosmin and 2-methylisoborneol (MIB) are two substances causing earthy/musty odours that are difficult to remove by conventional chemical drinking water treatment. In this study removal of geosmin and MIB by biofiltration of untreated surface water was investigated using granular activated carbon (GAC) and crushed expanded clay (EC) as filter media. Biofiltration through both GAC and EC removed geosmin and MIB present at low (20 ng l(-1)) concentrations by at least 97% at an empty bed contact time of 30 minutes and a temperature of 15 degrees C. At lower temperature (6-12 degrees C) and simultaneously lower biomass concentrations, removal efficiency was similar in the GAC but considerably lower in the EC biofilter, pointing to a second mechanism different from biodegradation. Consequently, microbial activity was suppressed with azide to enable discrimination between biodegradation and adsorption. During azide dosage, the GAC biofilters still removed geosmin and MIB nearly unaffectedly. In the EC biofilter, however, removal of both odorants ceased completely. Methylene blue adsorption confirmed that the GAC, even after almost four years of operation receiving surface water, had capacity to remove geosmin and MlB by adsorption. Since odour episodes commonly occur during the warm season when microbiological activity is high, EC constitutes a viable option as carrier medium for direct biological filtration of surface water. The additional GAC adsorption capacity however adds robustness to the removal process.

Nyckelord: biofiltration, drinking water, geosmin, MIB, adsorption, biodegradation, ACTIVATED CARBON ADSORPTION, SURFACE-WATER TREATMENT, MUSTY ODOR, COMPOUNDS, OFF-FLAVOR COMPOUNDS, DRINKING-WATER, MICROBIAL BIOMASS, BIOLOGICAL FILTER, SAND FILTRATION, 2-METHYLISOBORNEOL, TASTE



Denna post skapades 2008-12-10. Senast ändrad 2014-10-27.
CPL Pubid: 81029

 

Institutioner (Chalmers)

Institutionen för cell- och molekylärbiologi (1994-2011)
Institutionen för bygg- och miljöteknik

Ämnesområden

Biologiska vetenskaper

Chalmers infrastruktur