British Water sizing criteria

This code of practice was produced by the British Water Package Sewage Treatment Plant Focus Group.
The Environment Agency, the Environment and Heritage Service (Northern Ireland) and the Scottish Environment Protection Agency support the use of this code of practice, but the Agencies do not specifically endorse any particular manufacturer’s product.

The code provides a table of loadings which allows the total daily load fed into a sewage treatment system to be calculated. These criteria will be widely disseminated and it is recommended that designers of small wastewater treatment systems should use
this table of loadings. The flow and load figures given represent current best practice within the UK but may change with time. Guidance notes are provided to assist the user to consider the nature of the sewage being received for treatment and to identify the various sources of the sewage.

Each manufacturer is aware of the capabilities of their own systems with respect to the individual wastes, but guidance is given so that the user is aware of performance inhibitors. The table of loadings may be used for all sizes of package sewage treatment plant up to a maximum of 1000 population equivalents.

Use of this table by all UK manufacturers will;
Encourage collection of accurate and complete loading information
Provide a consistent data collection approach
Define site activity and sewage sources
Provide consistent information to system purchasers regarding treatability and difficult effluents
Reduce the problem of undersized systems

Full details of the guidelines are enclosed on the attached PDF, but please do not hesitate to call us on 01773 767611 should you require any further assistance.

Sizing criteria British Water.pdf - 210kb
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