Thames Water is hoping an innovative energy-saving trial will cut the cost of treating wastewater in some of its older biological reactors by up to 50 per cent.
The UK’s biggest water company has teamed up with Mapal Green Energy to launch a pilot scheme at its Chesham sewage works, Buckinghamshire, which serves a population of 35,000 people.
The Mapal system uses a tried and tested floating fine bubble aeration system which provides a far more efficient method for oxidising wastewater than traditional mechanical surface aerators, which are known to be costly to operate and, in many cases, unreliable.
The test, expected to kick-off in May, will involve fitting 13 floating fine bubble aeration units to the existing oxidation ditch, which ordinarily handles a flow rate of 14,450m3 every day.
In best case scenarios, the Mapal system has delivered energy savings of up to 70 per cent against the cost of mechanical surface aeration systems, which are still used at around 30 of Thames Water’s 350 sewage works.
In the UK, the system is being used by Anglian Water, Thames Water and United Utilities - Anglian Water has been piloting the equipment at its Stanbridgeford site since June 2013.
With further installations already up and running in more than 35 locations worldwide, Mapal's floating fine bubble aeration technology has been proved to meet and exceed stringent effluent quality parameters including the reduction of : BOD5, TSS, COD, Tkn and Ammonia.
Thames Water’s wastewater innovation manager, Pete Pearce, said:
“We were attracted by two obvious benefits of Mapal's system: the clear potential for energy savings, which fits well with our constant focus to drive down operating costs, and its ability to be retro fitted without any significant down time to day-to-day operation of the treatment plant. Reactors do not have to be drained and installation is rapid and easy, resulting in minimal disruption for us.”
In addition to energy savings, Thames Water is also hoping for reductions in maintenance costs - the Mapal system requires no moving parts in the treatment tank.
It can also be adapted for aggressive and hazardous liquids and is therefore suitable for application across a wide range of industry sectors where secondary wastewater treatment requires a solution based on aeration. Aerators are automatically adjustable to water depth and, because they float, are always level, delivering an even flow of oxygen within the reactor.
Mapal Green Energy pioneered the concept of floating fine bubble aeration (FFBA)as a more efficient means of treating waste water for both utility companies and industry applications. With no moving parts generating friction and driving high energy consumption, a key benefit for users of Mapal Green Energy’s floating fine bubble aeration system is its dramatically reduced energy bill.
Tests around the world have shown that in some cases, compared to surface aeration, a plant’s energy consumption can be reduced by up to 70% using the Mapal system.
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