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ARM Ltd

 
 
 
Primary media Sewage
Wastewater
System type Engineered systems
Process characteristics Aerobic
Installation Above ground
Availability For sale
Population equivalent (lower) 20
Population equivalent (upper) 5,000
 
 
 

Phragmifiltre® is the first reedbed technology in the UK that provides complete treatment of macerated or raw sewage in a single wetland system, with no pre-settlement and little or no power requirement.

To date there are over 800 Phragmifiltre® systems treating raw non-settled sewage from 20 to 5,000 PE (population equivalents) throughout Europe. The first UK system was completed in September 2015.

Developed in France, the Phragmifiltre® requires only screening and / or maceration of raw sewage, with no pre-settlement.

Applications

  • For primary, secondary and tertiary sewage treatment
  • Treatment of raw non-settled sewage from 20 to 5,000 PE
  • Ideal replacements for aging sewage treatment works
  • For the development of new sewage treatment

Benefits

  • Full primary, secondary and tertiary sewage treatment
  • High tolerance of temporary hydraulic overloading
  • Low to zero energy consumption
  • Sludge stored and composted on site, therefore no tankering or roadways required
  • Mineralised sludge can be applied directly to land
  • Simple operation
  • Low operating costs
  • Excellent integration into the landscape
  • No nuisance, such as odours and noise

Treatment description

The system is typically designed to have two stages.

The first stage is designed to filter, using three or more beds, and de-water the solids from the raw sewage on the surface of the reedbed. Macerated / screened sewage is fed to each bed in rotation, allowing all the beds to have a rest period. The filtrate passes down through the beds, which act as a typical vertical flow reedbed, primarily reducing BOD but also undertaking nitrification of ammonia.

The second stage, comprising vertical flow reedbeds, provides additional BOD reduction and completes the nitrification of ammonia prior to discharge.

Siphon technology is used (where possible) for dosing at both stages, minimising power requirements.

Phragmifiltre® stores and composts sludge on site, unlike conventional sewage treatment works, which generate sludges that have to be taken from small rural works for treatment. Phragmifiltre® only requires monthly operator visits. The mineralised sludge accumulated on the first stage beds should be removed once every 10-15 years and can be applied to land, since it meets “enhanced treated product” status.

Performance

Performance data from 70 plants have shown mean removal efficiencies of:

COD: 92%
BOD5: 97%
SS: 97%
TKN: 90%
TP: 32%


Phragmifiltre® is the first reedbed technology in the UK that provides complete treatment of macerated or raw sewage in a single wetland system, with no pre-settlement and little or no power requirement.

To date there are over 800 Phragmifiltre® systems treating raw non-settled sewage from 20 to 5,000 PE (population equivalents) throughout Europe. The first UK system was completed in September 2015.

Developed in France, the Phragmifiltre® requires only screening and / or maceration of raw sewage, with no pre-settlement.

Applications

  • For primary, secondary and tertiary sewage treatment
  • Treatment of raw non-settled sewage from 20 to 5,000 PE
  • Ideal replacements for aging sewage treatment works
  • For the development of new sewage treatment

Benefits

  • Full primary, secondary and tertiary sewage treatment
  • High tolerance of temporary hydraulic overloading
  • Low to zero energy consumption
  • Sludge stored and composted on site, therefore no tankering or roadways required
  • Mineralised sludge can be applied directly to land
  • Simple operation
  • Low operating costs
  • Excellent integration into the landscape
  • No nuisance, such as odours and noise

Treatment description

The system is typically designed to have two stages.

The first stage is designed to filter, using three or more beds, and de-water the solids from the raw sewage on the surface of the reedbed. Macerated / screened sewage is fed to each bed in rotation, allowing all the beds to have a rest period. The filtrate passes down through the beds, which act as a typical vertical flow reedbed, primarily reducing BOD but also undertaking nitrification of ammonia.

The second stage, comprising vertical flow reedbeds, provides additional BOD reduction and completes the nitrification of ammonia prior to discharge.

Siphon technology is used (where possible) for dosing at both stages, minimising power requirements.

Phragmifiltre® stores and composts sludge on site, unlike conventional sewage treatment works, which generate sludges that have to be taken from small rural works for treatment. Phragmifiltre® only requires monthly operator visits. The mineralised sludge accumulated on the first stage beds should be removed once every 10-15 years and can be applied to land, since it meets “enhanced treated product” status.

Performance

Performance data from 70 plants have shown mean removal efficiencies of:

COD: 92%
BOD5: 97%
SS: 97%
TKN: 90%
TP: 32%


 
 
 
Downloads
  • Brochure - Phragmifiltre
    Brochure - Phragmifiltre
    2pp 1.37MB
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Related entries

  • ARM Ltd: UK first: constructed wetland for full primary treatment
    UK first: constructed wetland for full primary treatment
    ARM Ltd
    Traditional treatment solutions at a sewage works includes the combination of physical, chemical and biological processes, and operations to remove solids, organic matter and nutrients from wastewater. For the first time in the UK a leading water company has commissioned the installation of a constructed wetland as a full primary treatment system...
    News, 26 September 2016

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ARM Ltd address and contact details

ARM Ltd
Rydal House
Colton Road
Rugeley
WS15 3HF
Tel: 01889 583811
Fax: 01889 584998
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