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 Every Treatment Plant which is installed must have a legal Consent to Discharge issued by the Environment Agency (EA).
This indicates the standard of treatment which you are required to meet and may include levels for Biochemical Oxygen Demand (BOD), suspended solids and ammonia.
The Sewage Treatment Plant is designed to meet your particular requirements.
The fibre-glass tank is installed below ground, visible only as a lockable manhole cover, with no mechanical or electrical parts inside the plant.
It consists of three main sections:
- Settlement Zone
The inlet pipe from the dwelling(s) foul drainage enters a settlement zone where solids, including paper, are screened and allowed to settle out. Lighter material will form a scum on the surface.
- Treatment Zone
aerated and filled with pieces of plastic media. Organic waste is decomposed by bacteria which are provided with a surface on which to live (plastic media) and oxygen from air which is pumped into the tank by a small air compressor (blower). The air compressor is an all-weather unit, and can stand outside or in a shed nearby. The electrical consumption is low (44 watts). BOD (effectively a measure of the 'polluting strength') and ammonia are reduced by the treatment process.
- Clarifier Zone
or secondary settlement where insert sludges are trapped. This reduces the level of suspended solids prior to discharge from the outlet
The waste material is rendered harmless and light sludges and non-biodegradable waste is exported by a vacuum tanker generally once per year (generally known as 'desludging'; Companies can be found in the yellow pages)
The Sewage Treatment Plant discharges to a soak-away, to a ditch or a water course, subject to the EA consent to discharge issued.
Note:
Excessive use of chemical cleaning fluids, such as bleach, would reduce the number of bacteria and be detrimental to treatment, therefore should be avoided. Rags, cotton buds, sanitary towels etc... must not be flushed down the WC's as they can cause blockages which could cause the drains to back-up towards the house.
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