MANTAIR SEWAGE TREATMENT CONVERSION UNITS

We, Coleman Contractors, have installed several hundred of these successfully for ten years for our clients. I first came across them when I was looking for an alternative to replacing good fibreglass cesspools with new Treatment Plants. To destroy a garden by installing one tank at great expense whilst at the same time making the existing almost new tank redundant seemed unneccessary, and this was what I had just done the week before I was approached by Mantair!

The Mantair range of sewage treatment conversion units provide a discreet, reliable and cost effective solution to sewage treatment for domestic dwellings and small scale commercial and industrial premises without mains drainage, but where an existing septic tank or cesspool is present. The effluent produced complies with the requirements of the Environment Agency for discharge direct to a natural watercourse. - Complies with BS 6297 : 1983.

BENEFITS
o The most economically installed treatment system in the UK;
o Does not require the installation of any tankage, thus avoiding the disturbance of established gardens;
o The treatment plant is completely hidden from view;
o Designed to produce an effluent in compliance with the Regulating Authorities;
o Peace of mind with a Lifetime Process Guarantee;
o The efficient air blower is both quiet and economical with low running costs;
o Integral surge control system;
o Works in high water table areas;
o Less than two hours maintenance a year;

INSTALLATION
Each Unit is purpose-built to suit the depth, diameter, invert depth and access shaft of the existing tank, so usually the unit can simply be dropped into place. An airline is taken from the tank to the site of the airblower, and an electric cable laid from this to the nearest suitable supply. Often the existing tank outlet drain can be used for the discharge. There is none of the disturbance and upheavel and destroyed gardens that is often associated with the installation of systems with their own tankage.

HOW DOES IT WORK
The MANTAIR system is powered by a small air blower, which can be located in either an existing outbuilding or in a small blower housing. (We use a concrete housing to totally kill all noise). The blower can be located up to 25 metres from the Mantair system and is powered by domestic 240v electrical supply. It is connected to the plant by a small bore MDPE pipe concealed underground. The blower provides the air that is required for the treatment process and to lift the treated effluent to the discharge point.
Sewage entering the tank discharges into the Aeration/Mixing Zone. Air is supplied to this zone via an aerator contained within a draught tube. Large and heavy solids are deposited in the Primary Settlement Zone.
The aeration and mixing encourages the growth of aerobic micro organisms which degrade the sewage.
The contents of this zone, where the micro organisms are maintained in suspension, is referred to as the 'mixed liquor'. As further flows enter the tank, mixed liquor is displaced into the Final Settlement Zone. Here the micro organisms separate and form a thin sludge. This is continuously returned to the aeration / mixing zone, thus maintaining the levels of micro organisms in the mixed liquor.
The liquid which remains in the final settlement zone is the treated effluent which is discharged from the system via the Final Effluent Airlift.
The final effluent airlift controls the rate of discharge from the system and prevents any shock hydraulic loads from affecting the treatment process. The use of an airlift enables the Mantair system to discharge the effluent at a higher level than the sewage inlet.

MAINTENANCE
Maintenance of the Mantair system is simple, and comprises the renewal of the air blower inlet filter and the flushing through of pipe work and components. The tank will require emptying by tanker at about twelve month intervals. Regular maintenance is essential to ensure the efficient operation of the Mantair System.
The Mantair Conversion Unit is simpler to maintain than most other treatment plants as there are no electrical, mechanical or moving parts within the underground treatment zone.

SPECIFICATION & MODEL SELECTION
Mantair packaged plants and conversion units are designed to treat domestic sewage and to achieve a final effluent standard of 20mg/It B.0.D. and 30mg/It Suspended Solids.
The Mantair treatment plants and conversions units are available in five population sizes.

The above sizing criteria are based on:
a) all roof and surface water being excluded from the treatment system:
b) kitchen waste disposal units not being connected to the foul drainage system serving the treatment system,
For Multiple Properties first use the above chart to determine the population requirement for each property. Then add together the population requirements of each property to arrive at the population size required for a single system. For example, if a system is to serve two properties - one with 3 bedrooms and one with 4 bedrooms, the size required for a single system is therefore 5 + 7 = 12 P.E.
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