Biological removal of organic compounds from water (Contact: Erik Arvin, Hans-Jørgen Albrechtsen and Charlotte B. Corfitzen)
Biological processes are studied regarding removal of gasoline compounds (BTEX and MTBE), heterocyclic aromatic compounds (NSO), chlorinated aliphatic hydrocarbons and pesticides (e.g. MCPP). New understanding has been obtained of the biodegradability, metabolite formation and kinetics of reactions. Processes have been modelled by the simulation programme AQUASIM.
Treatment of water by activated carbon (Contact: Erik Arvin, and Hans-Jørgen Albrechtsen)
Research has been conducted on removal of pesticides using granular activated carbon (GAC) filtration. New information has been obtained on the capacity of GAC to remove the pesticide metabolite BAM from drinking water. Sorption has been modelled by the programme AQUASIM. Furthermore, the research has addressed the question of whether experiments at the laboratory scale can predict full scale performance.
Removal of inorganic compounds from water (Contact: Erik Arvin)
Removal technologies are developed with focus on arsenic and fluoride. Other contaminants being examined include iron and ammonium. Experimental work and mathematical modelling is being conducted to facilitate system design. Removal methods being examined for arsenic and fluoride are adsorption and precipitation / co-precipitation in combination with oxidation.
Disinfection and disinfection byproducts (Contact: Henrik R. Andersen, Erik Arvin and Hans-Jørgen Albrechtsen)
Research is conducted on chemical disinfection (Cl2, ClO2 and O3) and UV disinfection with special focus on byproducts that may be formed by the treatments. We are interested in interactions between combinations of disinfections methods as a method for minimizing the total amount of byproducts produced in making a safe disinfection dose. Presently our main project is on interaction between chlorine byproducts in swimming pools and UV-treatment.
Heterogeneities in rapid sand filters (Contact: Erik Arvin)
Rapid sand filters in the real world are more or less heterogeneous. The porous space in the filters may be occupied by gasses, mineral deposits (iron- and manganese oxides and chalk) and organic deposits (biofilms, etc.). This leads to variations in pore velocities in space and time which affect the removal efficiency with respect to particles and dissolved contaminants. The present project aims at characterizing the spatial distribution of heterogeneities in pilot scale and full scale rapid sand filters by a range of diagnostic methods.