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Percolation Systems

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Percolation Systems

Pressurised System

A pressurised system distributes treated wastewater by discharging it through a system of small diameter pipes. The distribution network is made up of a supply manifold and specially designed and drilled distribution pipes. The wastewater is pumped at pressure from the treatment tank, ensuring it flows to all points of the network. This pipe network is laid out on a bed of stone and subsoil, covered with a geo-textile membrane and covered with topsoil.

Pressurised systems are particularly useful in raised percolation beds. Raised beds are constructed by creating a mound on top of the normal ground level using imported soil of suitable percolation characteristics. They are installed where difficult site conditions such as high water table, insufficient subsoil depth or poor percolation characteristics are encountered.

Pressurised-System

Pressurised System kits supplied by Moylough Eco Systems include:

  • Supply Manifold
  • Specially drilled 32mm distribution pipes
  • Geo-textile membrane cover
  • Installation and best practice manual
  • Delivery and/or installation of pressurised kits is available throughout the country

These kits are normally used in conjunction with secondary treatment systems. Usually the pump included in our AswaFlow treatment system can be used to feed the pipe network, however, distance from the system, height above the system and size of the pipe network may prevent this. In these circumstances we recommend the installation of a larger pump fitted inside a separate pump chamber which can also be supplied by Moylough Eco Systems.

Sizes

Each system is designed to be site specific. Size and layouts are dependent on the occupancy of the dwelling and the permeability of the soil. The following table outlines the minimum required bed sizes (EPA CoP, 2009).

P-T Values Loading rate on plan area (l/sq. m/day) Area required per PE (sq. m)
    4 5 6 7 8 10 12
3-20 ≤20 30 37.5 45 52.5 60 75 90
21-40 ≤10 60 75 90 105 120 150 180
41-50 ≤5 120 150 180 210 240 300 360
51-75 ≤3 200 250 300 350 400 500 600
(EPA, CoP, 2009)

 

Tertiary Systems

Local Authorities may specify higher effluent quality levels in specific circumstances. Tertiary treatment is used as a means to treat wastewater to high quality prior to discharge to a sensitive area or water course. Moylough Eco Systems offer a range of solutions for such circumstances

Sand Filters

Sand-Filters

A sand filter consists of several layers of graded sand. Wastewater is distributed evenly over the filter's surface. It then percolates through the sand, where it is treated by a biofilm within the system. The effluent from the system will be clarified to the required standard.

Moylough Eco Systems provide the following services:

  • A system designed to suit your needs
  • Systems can be housed in one of our precast tanks or in an in-situ built tank
  • Specially designed 100mm distribution pipes
  • Sand filters can be used in conjunction with the Aswaflow wastewater treatment system

 

Reed Beds

Reed-Beds

A sand filter consists of several layers of graded sand. Wastewater is distributed evenly over the filter's surface. It then percolates through the sand, where it is treated by a biofilm within the system. The effluent from the system will be clarified to the required standard.

Moylough Eco Systems provide the following services:

  • A system designed to suit your needs
  • Systems can be housed in one of our precast tanks or in an in-situ built tank
  • Reed beds can be used in conjunction with the AswaFlow wastewater treatment system

 

Sterilisation Units

Sterilisation-Units

Sterilisation usually consists of UV light treatment of the treated effluent prior to discharge to a water course or to a percolation area in a sensitive area. This will reduce the pathogen content of the effluent.

Moylough Eco Systems provides the following services:

  • A system designed to suit your needs
  • System can be incorporated into the Aswaflow wastewater treatment system

 

Sizing

Each system is designed to be site specific. Size and layouts are dependent on the occupancy of the dwelling and the effluent quality. We have standard systems for different sizes; however, we can offer kits to suit your site with regard to size and layout. We also offer an installation service.

 

Trench Systems

A trench percolation system uses a series of specially designed 100mm perforated pipes in stone lined trenches to distribute treated effluent to the subsoil, where it undergoes further treatment. Each pipe is connected to a single distribution box which evenly distributes the wastewater between each trench. A permeable geo-textile membrane covers the stone trench, preventing clay from the top soil from washing down and sealing drainage paths.

Distribution of water along the trench relies on gravity, therefore accurate levels are critical. As this can be difficult to achieve in long trenches, Moylough Eco Systems recommend that a gravity system and hence a trench system is not installed for trench lengths greater than 100m.

Trench-Systems

Trench kits supplied by Moylough Eco Systems include:

  • Distribution box and accessories
  • Specially designed 100mm distribution pipes
  • Geo-textile membrane cover
  • Installation instruction and best practice manual

 Sizing

The design of a percolation area will vary with both the site characteristics and method of wastewater treatment. The minimum design requirements are stated in the following tables, as per EPA Code of Practice for Wastewater Treatment and Disposal Systems Serving Single Houses, 2009. For this reason, each design should be site specific.

P-T Values Percolation Trench Discharge Trench Length Required per no. of People (m)
    4 5 6 7 8 10 12
3-21 ≤50 24 30 36 42 48 60 72
21-40 ≤25 48 60 72 84 96 120 144
41-50 ≤25 48 60 72 84 96 120 144
51-75 ≤16 75 94 113 131 150 188 225
10m Maximum Trench Length (EPA, CoP, 2009)

 

 

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Moylough Concrete Products Ltd 

Works & Head Office - Cloonascragh
Athenry Rd. Tuam, Co. Galway
Tel: 093-28800 | Fax: 093-28818
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Moylough Eco Systems

Works & Head Office - Cloonascragh
Athenry Rd. Tuam, Co. Galway
Tel: 093-28800 | Fax: 093-28818
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

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