Severn Trent to roll out new phosphorus removal technology
Severn Trent is beginning to roll out new ground breaking technology to remove phosphorus from the sewage treatment process to meet new stringent targets.
The company has been trialling six new technologies at Packington Sewage Treatment Works in Leicestershire - two of which are world firsts - to find the best way to reduce the amount of phosphorus from water that is returned to the environment.
Stricter rules imposed as a result of the Water Framework Directive mean that the amount of phosphorus allowed be discharged from sewage treatment works is falling to 0.5 mg/l or, in some cases, as low as 0.2mg/l.
Pete Vale, Technical Lead, Innovation at Severn Trent, explains: “New legislation in the Water Framework Directive requires us to meet much tighter phosphorus limits than we have in the past and that’s why we’ve been trialling these new types of technology.
“We hope that by developing these we can get down to around the 0.1milligramme per litre level and greatly reduce the amount of phosphorus that goes back into our streams and rivers.”
Phosphorus is a normal part of domestic sewage but usual treatment processes only remove part of it.
Vale continued: “During the trials we’ve been using some really state-of-the-art techniques to understand which technology will work for our sewage treatment sites that greatly differ in size – from very small local sites to one of the biggest in Europe.
“We’ve already taken some of the learnings and have installed some new technology at three plants with another nine in the planning process.
“This is just the beginning of the journey and we’ll be continuing this research to improve our phosphorus-removing techniques and provide us with a more sustainable future.”
The technologies being evaluated are: membrane filtration; nano-particle embedded ion exchange; pile cloth media filtration; ballasted coagulation and clarification; immobilised algal bioreactor; and absorption media reed beds. The ion exchange and algal bioreactor, both of which were developed by Cranfield University, are being put into practical application for the first time.
The pile cloth media filtration is now in place at three sites with plans for four more and the ballasted coagulation and clarification will be installed at two further sites in the near future.
- Innovative system to tackle odours at UU's Davyhulme A team of graduate engineers at United Utilities has installed an innovative system to tackle odours at Davyhulme wastewater... Read More >
- Sewage Recycling System makes UK debut at Scottish Water Scottish Water has tested a new recycling technology for wastewater at Dunbar and Aviemore Wastewater Treatment Works, and... Read More >
- UK's largest ice-pigging scheme underway Northumbrian Water (NW) is undertaking one of the UK's largest ice-pigging projects through a deal with Morrison Utility... Read More >
- Comment: Networks make the world go round Real-time, 'smart' water networks have been discussed for a decade without fully taking shape, but the barriers to... Read More >
- Ending the nightmare of wet-wipe pump blockages An ingenious device developed in partnership with Scottish Water promises to reduce wastewater pump maintenance by... Read More >
- Round Table: Phosphorus Removal and Wastewater Innovation In the latest WWT round table, participants discussed the progress of innovative technologies for phosphorus removal, the... Read More >
- Water Innovators 2017 - lend us your skills! In the latest blog from WaterAid, Rob Fuller highlights the need for innovation in solving water challenges in the... Read More >
- Interview: Professor Dragan Savic, Exeter University "If you can't measure, you can't manage - and the most uncertain element of water management is the demand." Read More >