Septic Tank Upgrade – Mill Cottage, Blickling, Norfolk

sewage plant norfolk installed sewage plant norfolk

Located on the delightful Blickling Estate in North Norfolk is Mill Cottage, a three bedroomed house on the banks of the river Bure, adjacent to the now redundant Blickling Mill buildings and race.  After the renovation of the property Mantair were appointed as the preferred contractor to provide a design, installation and commissioning service for the upgrading of an ageing septic tank.

On inspection of the existing septic tank it was found that the tank did not have enough capacity to enable the installation of a Mantair septic tank conversion unit.  It was therefore necessary to provide a treatment solution that involved the installation of a new tank.

With the property being on the banks of the river Bure, the natural water table in the ground is only 2ft below ground level.  With the natural water table being this high a new soakaway system would not function and it was therefore decided to install a sewage treatment system which would allow the overflow to be discharged into the river Bure.

septic tank upgrade norfolk River Bure Norfolk

When considering all of the sewage treatment plants available for a site such, Mantair identified that the Puraflo Peat sewage treatment system provided the best economical and efficient solution to overcome the drainage issues at the property.  Unlike other sewage treatment plants the Puraflo Peat sewage treatment system does not require the installation of a deep underground tank as the system is installed partially above ground reducing the excavation depth to a minimum.

It is however, necessary to have a septic tank ahead of the Puraflo system to trap solids and floating matter.  With this in mind, it was decided to utilise the existing septic tank and install a pumping station after the tank.  The liquids discharged from the septic tank would drain into the new pumping station and be pumped to the Puraflo sewage treatment plant.

At the heart of the Puraflo sewage treatment system is the Peat Bio Filter, an efficient filter that is made from 100% natural resources.  A combination of biological and chemical processes inherent in natural peat treats the receiving wastewater from septic tank and filters it through the bio-fibrous peat modules.  The resulting treated effluent is clean enough for discharge direct into the river.

As part of the project Mantair liaised with the Environment Agency and the local CNC Building Control to obtain the relevant approvals for the installation and the discharge into the river Bure.

Mantair engineers not only installed and commissioned the Puraflo sewage treatment plant with minimal disturbance, but have also provided a full after care service including planned maintenance visits.

If you require assistance with a septic tank problem or have a requirement for a new sewage treatment plant or septic tank, call our team today to receive a free site visit.


Orford Ness Nature Reserve, Suffolk – Sewage Treatment Plant Installation.

orfordness ordfordness suffolk sewage plant

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 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 waste water facilities on the Ness, the National Trust asked Mantair to investigate and provide a solution to the problem, taking into account the wide variation in waste water 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.

orfodness mantairsewage treatment plant installation

Taking into account that Orford Ness is an internationally important site for nature conservation, the Environment Agency and English Nature accepted Mantair’s waste water 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 waste water flow increases substantially.  A 42PE Tricel packaged sewage treatment plant was installed to cater for the increase in flow during summer.

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.

If you require assistance with a septic tank problem or have a requirement for a new sewage treatment plant or septic tank, call our team today to receive a free site visit on 01255 476467.


Sewage Treatment Plant Installation, Cooksmill Green, Chelmsford, Essex.

At this property in Essex we installed and commissioned a sewage treatment plant to replace a failed septic tank system.

Mantair was contacted by the owner of a property located in the hamlet of Cooksmill Green, near Chelmsford in Essex.  The homeowner requested the services of Mantair to assist in the modernisation of a septic tank system.

On inspection of the foul drainage system it was evident that the existing septic tank discharged directly into a nearby roadside ditch.  On viewing the internal condition of the septic tank is was apparent that the structural integrity of the tank was impaired.

Using the Geological Survey Map of the Chelmsford area, Mantair engineers were able to determine that the underlying sub-strata was predominately clay.  With the ground conditions being impermeable a replacement septic tank soakaway system would not operate correctly as the discharged liquids would be unable to percolate through the sub-strata.


Mantair recommended that the septic tank be replaced with a packaged sewage treatment plant, which would provide suitable treatment so that the final effluent would be acceptable and in accordance with the Environment Agency’s requirements for discharge to the roadside ditch.

After discussing the clients concerns and requirements it was paramount that the new sewage treatment plant was both quiet and had minimal maintenance requirements.

Following the initial site survey and subsequent discussions with the client, Mantair recommended in accordance with the British Water Flows & Loads Code of Practice, the installation of a six person Tricel sewage treatment plant with Medo air blower.

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 roadside ditch.

Prior to any ancillary works commencing Mantair engineers scanned the proposed location of the new sewage treatment plant and areas where any excavations were taking place to ensure that no underground services were present.


The scope of the installation works included:

  • Exposing the existing foul drainage pipe work and diverting to the location of the new Tricel sewage treatment plant;
  • Installation of the sewage treatment plant in a suitably sized excavation, including for a concrete base and back-fill;
  • Locating the Medo 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 sewage treatment plant;
  • Installation of a new 110mm diameter discharge drain to the roadside ditch;


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.

All machinery was removed from site with the garden being left in a neat and tidy manner.

With our head offices based in Essex, we are ideally placed to provide Essex homeowners with a septic tank and sewage treatment plant installation service.  Mantair provides a comprehensive service, including free site inspections, guidance and advice on the most suitable system, complete installation, commissioning and full after sales care.

If you would like a Mantair engineer to visit you regarding an existing septic tank problem or sewage treatment plant installation, please fill out the form below and we shall contact you, or alternatively contact us on 01255 476467.