Off Mains Drainage Solution

Off mains drainage solutions can be varied and are mainly determined by the site conditions and applicable regulations. Off mains drainage systems can be in the form of a cesspool, septic tank, septic tank conversion unit or packaged sewage treatment plants.

With many developments in recent times being beyond the reach of ‘mains drainage’, the number of properties requiring an ‘off mains’ drainage solution has increased substantially. When an ‘off mains’ drainage system is the only option then the first choice should always be to install a sewage treatment system. This was highlighted by the DETR report which recommends septic tanks should only be considered if a sewer connection or sewage treatment system cannot be used.

An example of a sewage treatment plant installation is below.

At this property the ‘brick’ septic tank was struggling to cope with the flow being produced by the household, resulting in the receiving drainage field / soakaway surcharging. It was agreed with the client to replace the failing system with a modern Tricel Novo sewage treatment plant.

Tricel Novo sewage treatment plants are Certified to European Standard EN12566-3. By providing a safe environment for the collection and treatment of waste water, the Tricel Novo system produces a mostly clear, odourless treated effluent suitable for discharge direct to a watercourse or drainage field / soakaway.

  

With the new Tricel Novo system being installed in a more secluded part of the garden, it was necessary to excavate the existing foul drainage from the property and install new foul drainage to the location of the Tricel system, which included the lifting and reinstatement of a patio.

As with all septic tank and sewage treatment plant installations we execute, the Tricel Novo system was installed with a concrete surround to protect the structural integrity of the tank. An independent RCD protected power supply was installed from the property to the Tricel system, with the relevant NICEIC Certification being obtained.

A new discharge drain was installed and connected to the Tricel system allowing the treated effluent to drain directly into a nearby ditch. The existing septic tank was de-commissioned and in-filled.
Prior to the project being completed the local Building Control officer inspected the works, approved all elements of the project and issued a Building Notice Certificate.

  

Mantair provides a comprehensive service for all off mains drainage systems, including free site inspections, guidance and advice on the most suitable system for the client’s requirements and complete installation

Call our team today to find how we can help you – 01255 476467.

 

 

 

Sewage Treatment Plants Norfolk

For sewage treatment plant installations and repairs throughout Norfolk, Mantair provides homeowners with a complete design, installation and maintenance service. As leading installers and service providers, Mantair has installed sewage treatment plants and septic tanks throughout the County of Norfolk for many years, including various locations for the National Trust at Blickling, Felbrigg and Sheringham Parks.

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Providing a free site assessment service throughout Norfolk and East Anglia, Mantair offers a comprehensive service including free site inspections, guidance and advice on existing systems and where required, complete installation and commissioning for new sewage treatment plants and septic tanks.

As members of British Water, Mantair are abreast of all current regulatory requirements for both the Environment Agency and Building Regulations, including the ‘general binding rules‘ for using septic tanks and small sewage treatment plants.

Case Study

Sewage Treatment Plant Installation in Norfolk.

We were contacted by a property owner in North Norfolk who was experiencing problems with foul odours emanating from the existing sewage treatment plant serving the property. After our initial telephone discussion with the property owner, it was evident that the existing sewage treatment plant wasn’t functioning correctly, and we agreed to visit the property to inspect the treatment plant.

Upon inspection, we found that the existing sewage treatment plant was a ‘three-stage’ system, incorporating primary, aeration and final settlement chambers. It was evident during our inspection that the partition wall separating the primary and aeration chambers had collapsed. As a result of this, the sewage treatment plant was no longer functioning, causing the reported odour nuisance. This also resulted in untreated effluent discharging from the sewage treatment plant into an adjacent watercourse.

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Mantair engineers have a wealth of experience in dealing with damaged sewage treatment plants and septic tanks.  The damage identified to the sewage treatment plant at this Norfolk property was considered to be consistent with accidental damage. In association with UKDP, we were able to obtain approval for the costs for a new sewage treatment plant installation to be covered by the property owners Insurance Policy; thus saving the property owner thousands of pounds.

As agreed with the Insurers, we recommended the installation of a six-person Marsh sewage treatment plant; this being sized in accordance with the British Water ‘Flows & Loads’ Code of Practice – 4.

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After taking into account the existing drainage layout and the property owners preferences, we recommended installing the new sewage treatment plant in the rear garden. This reduced the amount of excavation works required, and as a result, the amount of disturbance to the garden setting. Care was also taken by Mantair engineers to ensure that the ground area was protected prior to heavy machinery being used.

As with all sewage treatment plant installations we carry out, the Marsh sewage treatment plant was installed with a concrete surround to protect the structural integrity of the tank.  An independent RCD protected power supply was installed from the property to the air blower kiosk, with the relevant NICEIC Certification being obtained.

With the property owner already having Environment Agency approval to discharge treated effluent into a nearby watercourse from the existing treatment plant, it was agreed to connect the discharge drainage from the Marsh sewage treatment plant to the existing outlet pipework draining to the nearby watercourse.

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On completion of the ancillary works, we commissioned the Marsh sewage treatment plant, including setting of air valves, checking all pipe work joints and viewing the discharge into the receiving watercourse.

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

Could the cost to resolve your sewage treatment plant or septic tank problem in Norfolk be covered under your buildings insurance?  To find out more contact us on 01603 513232 or complete the form below.

Click here to view a sewage treatment plant installation video.

Septic Tank Failure

After purchasing a property on the outskirts of Norwich the new homeowners contacted us regarding a septic tank failure. The homeowners were made aware of the septic tank failure only two weeks after moving into their new home when the septic tank flooded.

Although the issues surrounding the septic tank were raised by the surveyor prior to the purchase of the property, the vendors didn’t appreciate the extent of the septic tank failure. After carrying-out a detailed survey of the foul drainage system, it was identified that the soakaway connected to the septic tank had failed, thus causing the septic tank to surcharge. With there being insufficient land available to construct a new soakaway the only solution available was to install a sewage treatment plant, with the treated effluent being discharged to a nearby ditch.

When sizing sewage treatment plants the British Water Flows and Loads Code of Practice should be used. With this property having four bedrooms it was necessary for a six-person system to be installed – number of bedrooms + two.

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After discussing the homeowners preferences and taking into account the site conditions, Mantair engineers recommended the installation of a Clearwater sewage treatment system.  The Clearwater system uses a three stage treatment process which incorporates a biological filter, and provides an economical solution for septic tank failures.

As part of the project we liaised with the Environment Agency and the local Building Control Department to obtain the relevant approvals for the installation of the sewage treatment plant and the discharge to the nearby ditch.

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As with all underground septic tank and sewage treatment plant installations Mantair carries out, the tank was completely encased in concrete to ensure the structural integrity of the tank is not impaired and to prevent the potential of flotation of the tank.

The installation of the sewage treatment plant included:

  • Exposing the existing foul drainage pipe work and diverting to the location of the new Clear sewage treatment system;
  • Installation of the Clearwater system in a suitably sized excavation and back-fill;
  • Locating the air blower within a remote blower housing;
  • Provision of an RCD protected power supply to the blower housing;
  • Installation of a new outlet pipe to the nearby ditch, including for the installation of a headwall and inspection chamber;
  • Backfilling all excavations and leaving the area neat and tidy;
  • De-commissioning and filling – in of the failed septic tank.

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

If you have a septic tank failure and require professional advice or guidance, please do not hesitate to contact us on 01255 476467, or complete the form below.

 

Sewage Treatment Plant Installation in Norfolk – National Trust

Sewage treatment plants offer Norfolk homeowners with a modern alternative to septic tank systems for areas not serviced by mains drainage. As leading independent installers and service providers for sewage treatment plants in Norfolk, Mantair is ideally placed to provide Norfolk homeowners with a sewage treatment plant to meet their site requirements, or provide the expertise required for assessing septic tank problems.

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Burnham Overy Tower Windmill in Norfolk was built in 1816 for Edmund Savory, a miller who was running a watermill on the River Burn known as the Lower Mill.  Savory worked this mill in Norfolk until his death on 9th February 1827, when it passed to his son John.  The mill was given to the National Trust in 1958 and has been converted to holiday accommodation.

The National Trust contacted Mantair with a view to installing a domestic sewage treatment plant to solve the septic tank problems at the property.  The project included the design and installation of an appropriate packaged sewage treatment plant with pumped outlet to facilitate the foul water drainage on site.  Prior to the design element of the project, Mantair carried out a full site investigation including a detailed survey of the existing drainage and underground services.

On sizing the new sewage treatment plant it was necessary to install an 18 population equivalent Tricel treatment plant to cope with the flow and strength of sewage the system would receive.

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During the design stages of the project, Mantair liaised with the Environment Agency to determine the point of discharge for the overflow from the system.  Due to site levels it was necessary to have a pumped outlet on the Tricel sewage treatment system to enable the treated effluent to be discharged to the agreed outlet point.  With the sewage treatment plant having an integral pump Mantair installed a high level alarm and beacon with back-up battery to provide instant warning of power failure.

As with all underground septic tank and sewage treatment plant installations Mantair carries out, the tank was completely encased in concrete to ensure the structural integrity of the tank is not impaired and to prevent the potential of flotation of the tank.

The scope of the installation works included:
  • Exposing the existing foul drainage pipework and installation of new drainage to the Tricel sewage treatment plant;
  • Complete installation of the Tricel treatment plant in a suitably sized excavation and backfill;
  • Installing a MEDO air blower within an existing outbuilding and provision of an RCD protected power supply;
  • Installation of the air main from the MEDO air blower to the Tricel sewage treatment plant;
  • Installation of the pumping main from the Tricel system to the point of discharge, including for the installation of an inspection chamber.

On completion of the ancillary works, we 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.

During the project Mantair engineers took all the necessary measures to ensure minimal disruption to the property and its surroundings.

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

If you would like a Mantair engineer to visit you please fill out the form below or contact us on 01255 476467.

 

Septic Tank Problem – Cromer Lodge, Felbrigg, Norfolk.

Part of the former Gate Lodge to Felbrigg Hall, Cromer Lodge is a quirky, cosy cottage situated at the entrance to Felbrigg Hall Estate in Norfolk.  Guests staying at Cromer Lodge enjoy easy access to park and woodland walks through Felbrigg Estate, whilst the Norfolk town of Cromer is only ten minutes drive away.

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Whilst surveying several drainage systems at Felbrigg Estate for the National Trust, Mantair engineers identified that the septic tank serving Cromer Lodge was in need of replacement.  The results of the septic tank survey identified the soakaway system connected to the existing septic tank was functioning correctly, allowing the discharged effluent from the septic tank to percolate into the sub strata.

Cromer Lodge is a National Trust Holiday Cottage for persons visiting Norfolk on holiday and as such the variations in flow can alter dependent from high to low seasons.  In view of this and the ground conditions being suitable for a soakaway system, Mantair recommended that a septic tank would be more suitable than a sewage treatment plant.  Sewage treatment plants can be susceptible to variations in flow.

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With the soakaway system functioning effectively and the cause of the problem being with the septic tank itself, Mantair engineers recommended that the only remedial works required would be replacing the existing failed septic tank with a modern septic tank.

With Cromer Lodge being a Holiday Cottage it was essential that all works were carried out and completed during a period when no guests were staying at the cottage.  This septic tank installation in Norfolk was carried out and completed over a period of only two days, ensuring no holiday bookings were affected.

Prior to any works commencing Mantair engineers scanned the proposed location of the new septic tank to ensure that no underground services were present.

The septic tank was delivered to Cromer Lodge using one of Mantair’s delivery vehicles after it had been inspected at Mantair’s head offices in Essex.  All septic tanks and sewage treatment plants Mantair provides are inspected prior to approval for delivery.

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The scope of the works included:

  • Exposing the existing foul drainage pipe work and installation of new drainage to the location of the new septic tank system;
  • Excavation of suitably sized hole in preparation for the installation of the septic tank;
  • Installation of the septic tank, including for a concrete surround;
  • Installing a new discharge drain from the septic tank to the existing soakaway system;
  • Emptying and filling-in of the old septic tank system;
  • Removal from site of all surplus excavated areas;
  • Backfilling all excavations and leaving the area neat and tidy.

On completion of the ancillary works Mantair commissioned the septic tank system and removed all machinery from site, leaving the garden area in a neat and tidy manner.

Mantair provides a comprehensive septic tank and sewage treatment plant service throughout Norfolk. This includes free site inspections, guidance and advice on the most suitable system for our client’s requirements, complete installation and full after sales care for both septic tanks and sewage treatment plants throughout Norfolk and East Anglia.

If you would like a Mantair engineer to visit you please fill out the form below or contact us on 01255 476467.

Septic Tank Upgrade – Mill Cottage, Blickling, Norfolk

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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.

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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.