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Cesspits

cesspitCesspits are purely a holding tank without an outlet. They will require emptying on a frequent basis depending on usage.

Cesspits act as a solution for locations without mains drainage where the discharge of treated effluent is not permissible. This is due to unsuitable ground conditions. Or it may be where infrequent use such as for a holiday home would prevent the use of a septic tank or packaged sewage treatment plant.

Sizing Criteria for Cesspits

British Water sizing criteria should be used when calculating the capacity of a cesspit. This is based on a loading of 200 litres per person per day in residential applications. The tank should be of a sufficient capacity to hold 45 days worth of effluent. For a single dwelling 18,000 litres (4,000 gallons) is the minimum allowable capacity. This capacity is suitable for two residents only.

Silage Tanks

silage tank oxfordshireSilage tanks are manufactured in the same sizes as cesspools, and are used for the storage of more toxic natural or chemical waste. Silage tanks are manufactured using special resins designed to be resistant to aggressive silage effluent and to comply with all statutory regulations.

Silage effluent has the potential to cause severe environmental damage if allowed to enter a watercourse as it has a very high BOD (Biochemical Oxygen Demand), up to 200 times greater than that of domestic sewage. Therefore, if it enters a watercourse it can very quickly remove all of the oxygen and kill off all aquatic life withing the ecosystem.

As silage effluent has caused numerous severe pollution incidents in the countryside, there are now a number of very strict statutory controls to regulate its collection and storage.

A typical application for a silage tank would be for a touring caravan site where a collection vessel was required to hold elsen waste from chemical toilet cassettes.

For more information on cesspits or silage tanks please contact us.

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