RAPID BIOFILM DEVELOPMENT IN DEEP GROUND WATER BY GALLIONELLA FERRUGINEA
The development of Gallionella ferruginea biofilms and the associated iron precipitation in flowing ground water from two 46 m deep wells were studied over 48 h. The bacterium formed biofilms of up to 1.76 /ìg total organic carbon per cm2 with 18.8 /ìg precipitated iron per cm2. Microscopic observations revealed multilayered net-works of the bacterium mixed with iron precipitates. Intermittent turbulence decreased the biofilm development by a factor of three. The experimental set-up proved to be a useful tool for determination of potential clogging problems and showed that G. ferruginea may constitute an important problem in the development of ground water heat pump technology.
Författare KARSTEN PEDERSEN and EVA-LENA HALLBECK