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WATER WORLD
Chance find has big implications for water treatment's costs
by Staff Writers
London, UK (SPX) Mar 27, 2017


File image.

A type of bacteria accidentally discovered during research supported by the Engineering and Physical Sciences Research Council (EPSRC) could fundamentally re-shape efforts to cut the huge amount of electricity consumed during wastewater clean-up.

The discovery has upended a century of conventional thinking. The microorganisms -'comammox' (complete ammonia oxidising) bacteria - can completely turn ammonia into nitrates. Traditionally, this vital step in removing nitrogen from wastewater has involved using two different microorganisms in a two-step approach: ammonia is oxidised into nitrites that are then oxidised into nitrates, which are turned into nitrogen gas and flared off harmlessly.

The outcome could be a big rethink regarding the energy-saving innovations developed over the last two to three decades in the field of nitrogen removal. Wastewater treatment is a huge consumer of electricity, accounting for 2-3 per cent of all power usage in western countries, and no less than 30 per cent of its energy bill results from the need to remove nitrogen. Most of the sector's efforts to reduce its energy use have focused on the two-microorganism approach.

The discovery was made by scientists working on the EPSRC-funded Healthy Drinking Water project, which is being led by the University of Glasgow and is due to publish its core findings later this year.

Dr Ameet Pinto has led the team, which has worked in collaboration with the University of Michigan in the US. He says: "This discovery took us completely by surprise. It's a superb example of how EPSRC support provides a secure platform for a can-do environment enabling researchers to achieve important spin-off breakthroughs in addition to the primary goals of their research".

Comammox was found in a drinking water system in the US. Other research groups have also detected it in wastewater treatment plants, in groundwater and even in aquaculture systems.

Dr Pinto says: "The discovery of a single microorganism capable of full nitrification will have a significant impact on our understanding of the nitrogen cycle and on efforts to manage nitrogen pollution. The potential is there for the wastewater treatment sector to exploit this breakthrough, which other teams in Europe have made in parallel with us.

"That would be an important step towards informing the development of robust approaches in terms of cutting costs and reducing carbon emissions associated with generating the huge amounts of electricity that the sector uses. It's a great story to highlight on World Water Day."

WATER WORLD
One in four children will live with water shortages by 2040: UNICEF
United Nations, United States March 22, 2017
Approximately one in four children worldwide will live in regions with extremely scarce water resources by 2040, UNICEF said in a report Wednesday. In research released on World Water Day, the United Nations children's agency warned that in just over two decades nearly 600 million children will be living in areas with severely limited safe water sources, as population growth and surging dema ... read more

Related Links
Engineering and Physical Sciences Research Council
Water News - Science, Technology and Politics

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