Partial renewal of granular activated carbon filters for improved drinking water treatment
Journal article, 2018

There is a trend of increasing natural organic matter (NOM) in raw drinking waters of Nordic countries due to climate change. Seasonal deterioration in NOM quality imparts challenges for delivering a consistently high drinking water quality. In this study, a simple and cost-effective operational strategy was investigated that improved short-term NOM removal in a full-scale treatment plant. Three granular activated carbon (GAC) media biofilters were modified by replacing a small fraction of saturated filter media with new media. Relative to replacing the entire biofilter media, this approach required lower capital cost and shorter downtime and maintained conditions for biological filter functioning. NOM removal efficiencies were compared in modified versus unmodified (reference) filters using online UV absorbance, and offline fluorescence and dissolved organic carbon measurements. The modified biofilters showed improved organic matter removal lasting for at least four weeks. Partial replenishment of GAC in full-scale biofilters may be a useful and sustainable operational strategy for coping with temporarily high NOM loads in raw waters that might otherwise cause water quality problems.

Author

Nashita Moona

DRICKS - Framework programme for drinking water research at Chalmers

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Kathleen Murphy

Chalmers, Architecture and Civil Engineering, Water Environment Technology

DRICKS - Framework programme for drinking water research at Chalmers

Mia Bondelind

Chalmers, Architecture and Civil Engineering, Water Environment Technology

DRICKS - Framework programme for drinking water research at Chalmers

Olof Bergstedt

DRICKS - Framework programme for drinking water research at Chalmers

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Thomas Pettersson

Chalmers, Architecture and Civil Engineering, Water Environment Technology

DRICKS - Framework programme for drinking water research at Chalmers

Environmental Science: Water Research and Technology

2053-1400 (ISSN) 2053-1419 (eISSN)

Vol. 4 4 529-538

Subject Categories

Water Engineering

Water Treatment

Environmental Sciences

DOI

10.1039/c7ew00413c

More information

Latest update

5/14/2018