Dryden Aqua manufacture air diffusers and diffused aeration systems as well as all of the the equipment which goes towards the

Leachate Index

The table below gives some typical examples of the Dryden Aqua fine bubble diffused aeration system performance in Tanks and Lagoons operating on the basis of a SBR ( Sequencing Batch Reactor). The system consistently removes all of the ammonium and BOD. The COD may contain hard COD or chemicals difficult for bacteria to metabolise, this usually accounts for 10% of the COD. AFM may be used to clarify to effluent to a very high standard and ozone of advanced photo oxidation may be used to take care of hard COD. The system will also reduce the TDS ( total dissolved solids), so if it is a requirement to use RO ( reverse osmosis), water treatment by the Dryden Aqua system will have a lower osmotic pressure and will be free of bio-nutrients.

Client	Location	Design capacity (m3/day)	COD in (mg/l)	COD out (mg/l)	BOD in (mg/l)	BOD out (mg/l)	NH3 in (mg/l)	NH3 out (mg/l)	Conductivity in mS	Conductivity out mS	Year
Sita	Arden quarry, UK	200	3000	250	1800	<5	700	<5	7000	3000	2002
Sita	BinnLandfill	200	2000	200	900	<5	800	<5	5400	2300	2006
Levenseat	Scotland	100	10,000	500	5000	<5	2000	<5			2006
Stirling Council	Polmaise	500	4000	200	2000	<5	1000	<5			2007
Battleby	Scotland	30	1800	120	1200	<5	1200	<5			2009

More examples and photographs of sites

Location	Client	Completed Projects
UK	Many installations of our skid mounted AFM filtration system. The system will treat 5 cubm/hr of water and reduce the solids in the effluent down to a low level. The AFM filtration system can actually treat the raw activate sludge in the aeration tanks, however it is best to use some primary sedimentation of flocculation prior to filtration for best performance. Thames water London England United Utilities Liverpool, England Levenseat Landfill site, Edinburgh Scotland Arden Quarry Lanfill site, England Vigo Utopia landfill site England Response Engineering. Ireland Ford Motors, England, Spain and Germany Scottish Water, Scotland Northumbian Water, England Suffolk & Essex Water, England
Scotland	Levenseat Landfill 100 cubm/day
England	County Environmental Services 1000 cubm/hr aeration system, and in tank heat exchangers
Scotland	Stirling Council Polmaise Landfill Site
Scotland	SITA Binn Landfill Site 200 cubm/day	Extended diffused aeration system in 2 x 2000 cubm lagoon
Scotland	Scottish Water	activated sludge effluent treatment on sewage works
Scotland	Scottish Water, Haddington	bio-digestion of collected sewage sludge
Glasgow	Scottish Water	activated sludge effluent treatment on sewage works
Edinburgh	Scottish Water	bio-digestion of collected sewage sludge
England	Sita site Arden Quarry click here for project details and full water analysis showing the start-up of a new system. Ammonium reduction 100%, BOD reduction is essentially 100%, COD reduction approx 95%. TDS reduction up to 50% which makes the effluent much easier to treat by RO if you are required to remove chloride. photo of system
Dunoon	Argyll & Bute District Council, water flowrates up to 600 cubic metres per day.
Belfast	Castlebray Borough council	no photo available
Lochgilphead	Argyll & Bute District Council, 4 x lagoon system, water flowrates up to 1200 cubic metres per day, average 400 cubm.day.
Balbarton	Kirkcaldy District Council	no photo available
Mickelby	Yorwaste Ltd
Distington	Cumbria County Council, system is contained in 50m x 30m building	inside the building
Colchester	Ex.Waste, 4 x lagoon system, strong leachate, water flowrate of approximately 120 cubic metres per day.
Park Hill	Vigo landfill site	no photo available
Hespinwood	Cumbria County Council, showing bio-catalyst hopper, strong leachate, water flowrates up to 200 cubic metres per day.

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