Why Package Sewerage treatment plants

If you can discharge to a watercourse or your drainage field requires a better quality effluent than that from a septic tank, a package Sewerage treatment plant might be the most appropriate method. Environmental Agency consent is required for a discharge from a package Sewerage treatment plant to a watercourse or drainage field.

The European Standard (EN 12566-3) contains details of the design and construction of package Sewerage treatment plants. The unit you choose will have to have to comply with certain parts of this standard in the future. You should check with your supplier that the unit you choose fully complies with legal requirements.

a) There are several different types of package Sewerage treatment plants available, each with a slightly different treatment technique, but each type provides a treatment unit or biological zone where the Sewerage comes into contact with micro-organisms that break down the organic matter in the Sewerage. If the unit you choose does not have a settlement tank, the Sewerage may need to pass through a separate settlement tank or septic tank before it enters the package Sewerage treatment plant to allow large solids to settle out. Any such upstream settlement tank must be adequately sized to work properly.

b) A package Sewerage treatment plant can treat the effluent from a septic tank where effluent quality needs to be improved.

c) You are likely to require consent from the Environmental Agency to make any discharges from a package Sewerage treatment plant. This consent will set quality and volume limits. You should seek the  advice on the likely effluent quality standard required before ordering the plant so that you can seek assurances from the manufacturer that the plant will consistently comply with these standards.

d) In some cases the discharge from your package Sewerage treatment plant may require additional treatment to meet any consent limits. This can be achieved by using an additional treatment system such as a reed-bed or wetland system, disinfection, filtration or settlement.

e) Package Sewerage treatment plants need a steady flow of Sewerage to keep the micro-organisms alive and to operate most effectively. If your site may generate erratic loads (for example holiday accommodation, scout camps) you should seek specialist advice as you might need a flow balancing system to even out the flow.

f) Some package Sewerage treatment plants can be designed to treat organic trade effluents such as milk washings or vegetable washings. You should contact the manufacturers for further advice.

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Why Domestic Sewerage treatment plants