Sewage Treatment Plant Installers Suffolk

Mantair LogoFor sewage treatment plant installations and repairs throughout Suffolk, Mantair Ltd provides homeowners with a complete design, installation and maintenance service.

Throughout rural areas of Suffolk, many properties, both domestic and commercial are not serviced by "mains drainage" for the disposal of waste water.  As leading independent installers of sewage treatment plants and septic tanks, Mantair is ideally placed to provide Suffolk homeowners with a sewage treatment system to meet their budget and site requirements.

Whether you are seeking a small domestic installation of a packaged sewage treatment plant, septic tank or septic tank conversion unit, or merely require advice over the telephone, Mantair has a track record of providing a professiojnal service in the field of waste water treatment solutions. All projects are carried out in accordance with Environment Agency Regulations and Section H2 of Building Regulations 

sewage-treatment-plants-suffolk sewage-treatment-plant-installers-suffolk sewage-treatment-plant-installation-suffolk


Case Study 1 - Sewage Treatment Plant Installation in Suffolk.

Client - National Trust.

Location - The Roundhouse, Bury St Edmunds, Suffolk.

Located on the delightful Ickworth Estate near Bury St Edmunds in Suffolk, in an area of outstanding beauty and tucked away in enchanting woodland is "The Roundhouse".  After the renovation of the property Mantair were appointed by the National Trust as the preferred contractor to provide a design, installation and commissioning service for the upgrading of an ageing septic tank serving the property.


A detailed survey was undertaken to determine the ground conditions of the site and to evaluate the location of underground services.  The results of a Percolation Test showed that the sub-strata was impermeable and that a replacement septic tank soakaway system would not operate effectively. 

After considering all the various options for foul drainage disposal and the size of the property, Mantair recommended the installation of 6PE (population equivalent) sewage treatment plant with a discharge direct to a nearby watercourse.  It was important that the chosen treatment system was installed below ground to ensure there was no visual impact on the properties surroundings.

As part of the project Mantair liaised with the Environment Agency and the local Building Control Department to obtain the relevant approvals for the installation and the discharge to the nearby watercourse.

Taking into account all of the site requirements, Mantair recommended the installation a 6PE Tricel sewage treatment plant with up-rated air blower.

sewage-treatment-suffolk sewage-treatment-plant-installers-suffolk sewage-treatment-plants-suffolk

Installation Procedure

  • Exposing the existing foul drainage pipe work and diverting to the location of the new Tricel sewage treatment plant;
  • Installation of the Tricel plant in a suitably sized excavation, including for a concrete base and backfill;
  • Locating the air blower within a Beehive blower housing - a purpose built housing designed to blend into the natural surroundings;
  • Provision of an RCD protected power supply to the Beehive housing;
  • Installation of the air main from the air blower to the Tricel plant;
  • Installation of a new 110mm diameter discharge drain to the receiving watercourse, including for the installation of a headwall;
  • Backfilling all excavations and leaving the area neat and tidy.

National TrustCommissioning

On completion of the ancillary works Mantair commissioned the Tricel sewage treatment plant, including setting of air valves, checking all pipe work joints and viewing the discharge into the final discharge chamber.

Mantair removed all machinery from site and left the garden area in a neat and tidy manner.

After all works were completed, Mantair provided the National Trust with a Maintenance Agreement providing a full after care service for the newly installed sewage treatment plant.


Case Study 2 - Sewage Treatment Plant Solution in Suffolk.

Client - National Trust.

Location - Orford Ness, Orford, Woodbridge, Suffolk.

Orford Ness is a 10 mile shingle spit of land off the Suffolk coastline and is separated from the mainland by the River Ore.  Orford Ness is the largest vegetated shingle spit in Europe and is both a Site of Special Scientific Interest (SSSI) and is also a RAMSAR Site.

Top secret military testing was carried out at this designated Outstanding Area of Natural Beauty during both World Wars and Orford Ness was home to both the Ministry of Defence’s Experimental Flying Research Station, and after World War 2, the Atomic Weapons Research Establishment. 

Orford Ness in Suffolk National Trust Orford Ness Nature Reserve Mantair

Orford Ness in Suffolk is now owned by the National Trust and is open to the public for parts of the year. 
Due to an ineffective septic tank soakaway system serving the wastewater facilities on the Ness, the National Trust asked Mantair Limited to investigate and provide a solution to the problem, taking into account the wide variation in wastewater flow between winter and summer months. 

Prior to the design element of the project, Mantair carried out a full site investigation including a detailed land survey for unexploded ammunitions and underground services.  Following the various preliminary site surveys, Mantair liaised with the Environment Agency, English Nature and Suffolk Coastal District Council regarding the project to determine an acceptable wastewater treatment solution. 

Taking into account that Orford Ness is an internationally important site for nature conservation, the Environment Agency and English Nature accepted Mantair’s wastewater treatment proposal which comprised two sewage treatment systems and a flow splitting chamber which allows the flow to be diverted to either of the two systems.  For low season during winter, a Mantair septic tank conversion system was fitted within the existing septic tank, converting the tank into a fully functioning sewage treatment plant.  In summer the Ness is open to the public and the wastewater flow increases substantially.  A 42PE packaged sewage treatment plant was installed to cater for the increase in flow during summer.

Mantair Tricel sewage treatment plantMantair sewage treatment plant installationMantair

The Orford Ness project in Suffolk posed significant challenges to Mantair engineers as there is still dangerous debris buried on the Ness, including bombs, and the only access onto Orford Ness is from Aldeburgh along shingle beach on a Unimog vehicle, or from Orford Quay on a landing craft.  Timing was also crucial on the project as the water table on the Ness is affected by the tide and all excavations had to be carried out within a certain time frame. 

Despite the complexity of the Orford Ness project, the pre-planning and experience of the Mantair engineers ensured that the project was completed efficiently and without any problems.


British Water Codes of Practice for Small Wastewater Treatment Systems


Flows & Loads 3 Sizing Criteria            Installation Guide                       Users Guide

British Water   Installation Guide Click to view the full digital publication online

            Click here to Download PDF                            Click here to Download PDF                         Click here to Download PDF


How Mantair Can Help You!

Mantair offers a comprehensive sewage treatment plant and septic tank service throughout Suffolk.  This includes free site inspections throughout Suffolk, guidance and advice on the most suitable system for the client's requirements, complete installation, commissioning and full after sales care. 



0800 121 6786
01255 476 467






Our sewage treatment and drainage engineers work throughout all of Suffolk, including Aldeburgh, Beccles, Brandon, Bungay, Bury St Edmunds, Clare, Eye, Felixstowe, Framlingham, Hadleigh, Halesworth, Haverhill, Ipswich, Kesgrave, Leiston, Lowestoft, Mildenhall, Needham, Newmarket, Orford, Saxmundham, Southwold, Stowmarket, Sudbury and Woodbridge.