The treatment group is an experimentally oriented research group working in close cooperation with SINTEF with most of the projects targeting development of new treatment processes as well as optimization of treatment processes both for:
- drinking water,
- industrial process water (for instance in aquaculture),
- municipal and industrial wastewater and
- sludge treatment.
The department is particularly strong in areas of research concerning the removal of humic substances in drinking wate and the removal of nutrients in wastewater (phosphate by chemical precipitation and nitrogen by nitrification/denitrification in biofilm processes); as well as particle separation processes (coagulation, flocculation, flotation, granular media filtration and membrane filtration).
Currently the focus of our activities is membrane filtration — a unit process that probably will revolutionise the water and wastewater treatment sector during the next decades. On the applied research side, the group has put a lot of emphasis on biofilm processes and has developed “the moving bed biofilm process” that is now commercialised and become very popular in practice all over the world.
In the area of water hygiene the research has been focused on rapid techniques for detection of bacteria in contaminated water aiming at development of rapid techniques for determining bacterial water quality and disinfection efficiency, and for assessment of bacterial viability. Disinfection of water and wastewater is another research activity, and the group works both with traditional (ozone, UV) and new (e.g. membrane technology) disinfection processes for removal of microorganisms (virus, bacteria, protozoa) from water. See also Treatment of produced water (pdf)
One of the main research areass for the water and wastewater treatment group is the application of membrane technology in drinking water treatment and wastewater treatment. The current activity includes;
- Hybrid membrane bioreactors (MBR)
- Ozononation-biofilm-membran processes for the removal of NOM in drinking water
- MF/UF filtration of water and wastewater
- Coagulation and MF/UF separation
- Membrane contactors for gas transfer (ozone)
Research topics and activity include:
Coagulants and flocculants
- Organic polymers
Disinfection (hygienic barriers)
- Activated silica addition
- Coagulation/ultra- og microfiltration
Water chemistry and hygiene
Research topics within water chemistry and water hygiene includes:
Rapid techniques for detection of bacteria
- Assessment of bacterial viability
- Assessment of disinfection efficiency
Disinfection (bacteria, virus, protozoa)
- UWater chemistry and hygiene
Grovfiltrering, Kjemisk primærrensing
Kaldnesprosessen, Koagulerings prosesser, Koagulanter and flokkulanter
Moving bed process (Kaldnes process)
Thermal sludge hydrolysis
TECHNEAU: drinking water treatment
EUROMBRA: development of MBR technolgy for treatment of municipal wastewater
Hybrid MBR process
We are currently working on the development of a hybrid MBR process combinig a moving bed biofilm reactor with a submerged membrane reactor for the separation of biomass/particulates.
MF/UF with coagulation pretreatment
The removal of NOM from drinking water is of major concenr in Norway. One of our projects is the development of a treatment process combining MF/UF filtration in a submerged membrane configuration with coagulation pretreatment.