Molloy Chieftain SBR®
EN certified septic tanks
Trench, pressurised or tertiary
Foul & clear water pump stations
Rainwater collection systems
Precast ballast & mounting solution
For patios, walkways, driveways
Clear, surface & foul water designs
Long term and energy efficient
Modular precast concrete tanks
Intercept fuel before it enters drainage
Fire-fighting water storage tanks
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.
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 Molloy Precast.
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).
Generic drawings are available. Site specific drawings can also be prepared on request. For further information do not hesitate to contact our design team. We would also strongly recommend a visit to our interactive training and display facility where you can see exactly how a pressurised system is constructed and operates.
A trench percolation system uses a series of specially designed 4" 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, Molloy Precast recommend that a gravity system and hence a trench system is not installed for trench lengths greater than 100m.
Distribution box and accessories
Specially designed 4” distribution pipes
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.
For further information do not hesitate to contact our design team. We would also strongly recommend a visit to our interactive training and display facility where you can see exactly how a trench system is constructed and operates.
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. We at Molloy Precast are delighted to design, manufacture and install solutions for such circumstances. We have developed a range of design solutions.
Off-the-shelf design - a ready to install packaged tertiary treatment system
Easy to install - no high skilled installation procedures required
Ready to go design - just place on the infiltration/dispersal pad and connect the inlet pipe
Compact - this system has a reduced footprint compared to a sand polishing filter
Available in 8PE and 15PE modules
You are in need of a tertiary treatment filter
You want to reduce the footprint from a soil polishing filter
You have a small site
Your site has a high water table or bedrock. This system could potentially eliminate the need for a raised bed.
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. Molloy Precast 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
Sand filters can be used in conjunction with the Aswaflow wastewater treatment system
Delivery and/or installation of sand filters is available throughout the country.
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, our team would be happy to design and manufacture kits to suit your site with regard to size and layout. We also offer an installation service.
Generic drawings are available. Site specific drawings can also be prepared on request. For further information do not hesitate to contact our design team. We would also strongly recommend a visit to our interactive training and display facility where you can see exactly how a tertiary treatment unit is constructed and operates.
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