Writing in the Inderscience publication International Journal of Environment and Waste Management, the team explains how bacteria that grow on particles in a sand filter effectively extract the compounds that produce the taste.
Natural earthy and musty smells in our drinking water are not usually a health risk, but many consumers prefer a fresher taste. This represents an ongoing challenge to the water companies.
"Although adverse odours do not present a risk to human health, their presence often leads to a misconception that the water is unsafe for drinking," explains Gayle Newcombe, Research Leader at the Applied Chemistry Unit of the Australian Water Quality Centre in Salisbury, South Australia.
She and her colleagues have investigated the effect of sand filters in extracting the most common earthy molecules, geosmin and methylisoborneol, from the water supply. These two compounds occur naturally in water and are non-toxic.
Newcombe and her colleagues at the Australian Water Quality Centre and Bridget McDowall in the School of Chemical Engineering at The University of Adelaide have now demonstrated that they can remove geosmin and MIB using biologically active sand filters. In such filters, the particles of sand are allowed to accumulate a biological film of beneficial bacteria that absorb and break down the biodegradable odour molecules.
The team tested sand filter material taken from working water treatment plants. They found that sand taken from a 26-year old filter had a well-established biofilm and was able to remove any detectable traces of geosmin and MIB in less than two weeks. Fresh filter sand with no biofilm, in contrast, was essentially ineffective, removing less than two-thirds of the geosmin and MIB even after several months of operation.
The team is now investigating how to accelerate the development of active biofilms for water purification.
Jim Corlett | alfa
A Fluttering Accordion
04.08.2015 | Friedrich-Schiller-Universität Jena
Molecular Spies to Fight Cancer - Procedure for improving tumor diagnosis successfully tested
03.08.2015 | Helmholtz-Zentrum Dresden-Rossendorf
Continuing current carbon dioxide (CO2) emission trends throughout this century and beyond would leave a legacy of heat and acidity in the deep ocean. These...
Glacier decline in the first decade of the 21st century has reached a historical record, since the onset of direct observations. Glacier melt is a global phenomenon and will continue even without further climate change. This is shown in the latest study by the World Glacier Monitoring Service under the lead of the University of Zurich, Switzerland.
The World Glacier Monitoring Service, domiciled at the University of Zurich, has compiled worldwide data on glacier changes for more than 120 years. Together...
Using ultracold atoms trapped in light crystals, scientists from the MPQ, LMU, and the Weizmann Institute observe a novel state of matter that never thermalizes.
What happens if one mixes cold and hot water? After some initial dynamics, one is left with lukewarm water—the system has thermalized to a new thermal...
Physicists from Regensburg and Marburg, Germany have succeeded in taking a slow-motion movie of speeding electrons in a solid driven by a strong light wave. In the process, they have unraveled a novel quantum phenomenon, which will be reported in the forthcoming edition of Nature.
The advent of ever faster electronics featuring clock rates up to the multiple-gigahertz range has revolutionized our day-to-day life. Researchers and...
Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.
04.08.2015 | Event News
23.07.2015 | Event News
10.07.2015 | Event News
04.08.2015 | Information Technology
04.08.2015 | Power and Electrical Engineering
04.08.2015 | Materials Sciences