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Afm Wastewater Treatment

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The tertiary treatment of wastewater and sewage effluent by AFM mechanical filtration.

The tertiary treatment of wastewater and sewage effluent by AFM mechanical filtration.

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  • A high percentage of the chlorine is actually consumed by the sand filters, and changing to new sand can dramatically reduce the chlorine demand of the filter. A key point is that the more chlorine that is consumed in oxidation of the alginates and bacterial cell biomass, the more volatile chlorine and combined chlorine compounds produced, this is a straight stoichiometric equation Research supported by the European Commission over the last 5 years by Professor Alfred Bernard from the Catholic University in Brussels has shown, that there is a potentially serious issue with a link between high levels of volatile chlorine compounds in swimming pools and respiratory disorders such as asthma in children. The link hasn’t been categorically proved, but it is perhaps best to err on the side of caution, and give serious consideration to this point.
  • A high percentage of the chlorine is actually consumed by the sand filters, and changing to new sand can dramatically reduce the chlorine demand of the filter. A key point is that the more chlorine that is consumed in oxidation of the alginates and bacterial cell biomass, the more volatile chlorine and combined chlorine compounds produced, this is a straight stoichiometric equation Research supported by the European Commission over the last 5 years by Professor Alfred Bernard from the Catholic University in Brussels has shown, that there is a potentially serious issue with a link between high levels of volatile chlorine compounds in swimming pools and respiratory disorders such as asthma in children. The link hasn’t been categorically proved, but it is perhaps best to err on the side of caution, and give serious consideration to this point.

Afm Wastewater Treatment Afm Wastewater Treatment Presentation Transcript

  • Effluent treatment systems
  • Reference List Scottish Water (national government organisation) Thames Water United Utilities Veolia Northumbrian Water Kimera chemicals plc Ford Motors plc Dagenham Viridor Sita Bristol Water DCW Danish Clean Water Carlsberg ScanWater Denmark Siemens Mot MacDonald Pure water solutions africa Hoimyung Corportation Korea Kuwait National Water Institute Istanbul Municipality and many more …………………….
  • Dryden Aqua a 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 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 filtration full scale installation… solids 80mg/l down to <5 mg/l using a pressure AFM filter
  • AFM performance for the treatment of sewage effluent compared against different technologies Independent 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 TYPE OF FILTER SS. (mg/l) Performance   %   Turbidity ntu Performance   % bacteria Performance   % Velocity inlet outlet inlet  outlet inlet outlet m3/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 sand 8.18 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
  • 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 TBT concentrations ug/l 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
  • 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/sqm
    • Air purge flow >95 cubm/hr/squm
    • Back-wash water flow >55 cubm/hr/sqm
  • Dryden Aqua provide solutions Dryden Aqua AFM filter media is used in pressure filters rapid gravity filters moving bed sand filters AFM media makes the filters work no channelling of water through the bed predicable run phase and back-wash media never needs to be changed
  • Activated sludge fine bubble diffused SBR system supplied to Saudi Arabia for the city of Medina aeration 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 LTD
    • Butlerfield
    • Bonnyrigg
    • Edinburgh EH19 3JQ
    • Scotland. UK
    Tel +44 (0) 18758 22222 Fax +44 (0) 18758 22229 www.AFM.eu [email_address]