Effluenttreatment

systems

Reference List

Scottish Water (national government organisation)Thames WaterUnited UtilitiesVeoliaNorthumbrian WaterKimera chemicals plcFord Motors plc DagenhamViridorSitaBristol WaterDCW Danish Clean WaterCarlsbergScanWater DenmarkSiemensMot MacDonaldPure water solutions africaHoimyung Corportation KoreaKuwait National Water InstituteIstanbul Municipality and many more …………………….

Dryden Aquaa selection of our products manufactured in Scotland

Air diffusers & aeration systems

Wireless oxygen monitor

Ceramic oxygen diffuser

Degassing & oxidation

ZPM static mixers

We manufacture many more products for water treatment, one of the main ones is AFM Active filter media for the mechanical filtration of waste water

Mechanical filtration of wastewater

Replaces sand in all sand filters, Typically improves performance by 30% to 50% for all types of sand filter

Some technical aspects of AFM

• AFM is manufactured by Dryden Aqua in Scotland • AFM is an active filter media, with a high negative

zeta potential hydrophobic surface and catalytic properties

• AFM mechanically removes most particles down to 5 microns.

• AFM high zeta potential makes it adsorb micron and sub-micron particles as well as dissolved organics directly from solution

• Works synergistically with cationic floculents and polymers

• AFM rejects bacteria growth, AFM will not become a biofilter, and the media will not be subjected to bacteria coagulation.

AFM particlewith permanentsurfacenegative charge

“Stern layer” positively chargedions align over the surface ofAFM, hydrated counter ion,shear or slip plane

Diffuse layer, with apredominance of negativecharges

Water to be filtered

Zeta potential

AFM active filter media

AFM is an Active Filter Media and direct replacement for sand in all types of sand filters, clean water and wastewater.

AFM does not need to be replaced, the media may be used for the life of the filter, and can be recycled and used again.

AFM does not bio-coagulate or experience worm-hole channelling. Drinking water filter performance improves by approx 30%, tertiary treatment filters work much better.

Performance is stable predictable

AFM® is certified under Regulation 31 of the UK Drinking Water inspectorate, AFM® is compliance with European Water Directive (98/83/EC) & (80/778/EEC) and is manufactured under ISO9001-2008 quality control procedures in accordance to BSEN12902 and BSEN 12904.

Before & after AFM filtrationfull scale installation… solids 80mg/l down to <5 mg/l using a pressure AFM filter

TYPE OF FILTERSS. (mg/l) Performanc

e %

Turbidity ntuPerformance

%

bacteriaPerformance

%Velocity

inlet outlet inlet outlet inlet outletm3/m2/h

RGF sand filter with sand

7.14 2.2 69 3.5 2.23 36 23120.0 12300.0 46 1.2

Pressure filter with sand8.18 3.82 53 5.87 4.76 18 22311 18023 19 4.96

Moving bed sand filter with sand

7.08 3.82 46 2.13 1.79 16 14067 10307 26 5.4

Drum filter 10 micron

14.66 7.33 50 7.16 3.88 45 56712 38460 32 3.23

Disc Filter 10 micron

5.6 3.1 44 2.22 2.06 7 30450 21138 30 2.12

Ring Filter 10 micron

7.41 3.98 46 3.01 3.17 9447 7761 17 2.5

AFM® Pressure filter 10.60 0.89 96% 2.98 0.24 92 % 23000 10000 58 % 3.59

AFM performance for the treatment of sewage effluent compared against different technologiesIndependent tests conducted by Spanish Water Company and reported in Technology del Agua , December 2009, page 47.

AFM media in a pressure filter out-performed all other technologies, some of which were 10 times the cost

Tertiary treatment of

sewage effluent

comparative evaluation of a high quality

Sand

against

AFM

using Gravity Sand filters independently certified under identical conditions

Run-phase & back-wash profile Tertiary treatment using Rapid Gravity Sand filter

Sand filter, run phase performance is variable, and periods where most of the water channels through the sand bed are self evident.

Run-phase & back-wash profile Tertiary treatment using Rapid Gravity AFM filter

. AFM filter media, run phase performance and back-wash frequency is stable and predicable. No by-passing or channeling of waste water through the bed.

Biofouling of sand and AFM

• Electron micro graphs of sand and AFM

• Sand grains have 100% bacteria coverage after 3 days

• AFM stays free of biofilm, even after 5 years in sewage effluent

• Alginates excreted by bacteria coagulate the sand and cause wormhole channeling. This does not happen with AFM

New sand Used sand

New AFM Used AFM

AFM removes toxic chemicals List 1 & red list treatment

Works effluent AFM product water AFM back-wash

4.6 <3.8 6.3

<3.8 <3.8 4.5

<3.8 <3.8 11.1

5.2 4.0 10.4

6.1 <3.8 9.9

TBT concentrations ug/l

Filtration AFM verses sand filtration

What goes into a filter must come out in the back-wash

The graph opposite is the back-wash profile for identical sand and AFM filters after 10 weeks.

The profile shows that 30% more solids are back-washed out of the AFM. 30% more solids have there been removed during the run phase

AFM performance is maintained while sand filters continue deteriorate with time. Data from trials conducted by Suez Lyonnaise des Eaux

30% improvement after 10 weeks, 50% after 52 weeks.

AFM wastewater operational criteria

• The performance of any media bed filter will vary indirectly proportionally to the flow of water, so it is always best to run the filter at the slowest possible run phase water flow.

Optimum conditions

Run phase water flow <5 cubm/hr/sqmAir purge flow >95 cubm/hr/squmBack-wash water flow >55 cubm/hr/sqm

Dryden Aqua provide solutions

Dryden Aqua AFM filter media is used in

pressure filtersrapid gravity filtersmoving bed sand filters

AFM media makes the filters work

no channelling of water through the bedpredicable run phase and back-washmedia never needs to be changed

Activated sludge fine bubble diffused SBR system supplied to Saudi Arabia for the city of Medinaaeration systems and controls manufactured by Dryden Aqua

Tertiary treatment after activated sludge production of class 1 irrigation water. Performance comparison between anthracite H (Filter A) and AFM ( Filter B) in pre-flocculated and chlorinated

Dryden Aqua system treat waste water by extended diffused aeration SBR ( sequencing Bio-reactors). After the biological process a “One Pass” AFM filtration with pre-coagulation and flocculation using Dryden Aqua ZPM, followed a second ZPM with chlorine injection or disinfection by Dryden Aqua electron abstraction system, will produce class 1 irrigation water from waste water and in most cases it will be in compliance with the European dinking water quality directive.

Simple Effective Solutions

Dryden Aqua

Dryden Aqua LTDButlerfieldBonnyriggEdinburgh EH19 3JQ Scotland. UK

Tel +44 (0) 18758 22222Tel +44 (0) 18758 22222Fax +44 (0) 18758 22229Fax +44 (0) 18758 22229www.AFM.eusales@drydenaqua.comsales@drydenaqua.com