3000 Litre septic tank.
The primary function of a septic/settlement tank is to provide quiescent conditions to enable suspended solids to settle out, be retained and to produce a final effluent of as
high a quality as possible. The higher the quality, the greater the efficiency and life of the soil infiltration system.
The controlled flow principle of the tank through two ,chambers provides excellent conditions for settlement and sedimentation. The tank has been so designed to extend the flow path between the inlet and outlet as far as possible for maximum overall efficiency.
Septic tanks for domestic properties are based upon the following table for number of persons served. For larger installations the nominal capacity will depend on one or more
of the following design criteria:
a) Population total loading
b) minimum sizing criteria including sludge storage capacity
c) additional design criteria for domestic wastewater flows from sources such as hotels, restaurants or commercial premises.
Siting the tank
British Standard BS 6297: 1983 recommends that sewage treatment works should be as far from habitable buildings as is economically practicable. The direction of the prevailing wind should be considered in relation to any properties when siting the works.
In accordance with the Building Regulations 2000. H2 2002 edition septic tanks should be sited at least 7m from any habitable parts of buildings, and preferably downslope.
The tank should not be installed near a road or driveway, where it could be subjected to high external loads, unless the installation is designed to withstand such loadings so they are not transferred to the tank shell.
Where the tank is to emptied using a tanker, it should be sited within 30m of a vehicle access provided that the invert level of the septic tank is no more than 3m below the level of the vehicle access. This distance may need to be reduced where the depth to the invert of the tank is more than 3m. There should also be a clear route for the hose such that the tank can be emptied and cleaned without hazard to the building occupants and without the contents being taken through a dwelling or place of work.
Adequate ventilation of the septic tank and the inlet pipework shall be provided to prevent the accumulation of fermentation gases.
Inlet and outlet configurations
Standard inlets and outlets can be replaced with bespoke pipework, including twin (T) pipes, large diameter pipes and weir fittings, to suit site conditions. Baffles can be fitted as required.
Vent connections can also be specified.
Internal benching can be incorporated into the first chamber to facilitate sludge removal.
Chocks can be moulded to the tank shell to stabilise the tank and ensure it is maintained in a vertical position on a flat concrete slab.
Access shafts can be situated at any location on the tank and are available in a range of standard sizes and configurations.
Standard sizes available are:
600, 750, 900, and 1200 diameter.
Sludge removal pipework
Any desired configuration can be supplied including vertical and inclined pipes with male or female Bauer or similar connections. Also with GRP bellmouth or ‘T’ inlet.
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