Oil Treatment for Vehicle Wash Interceptors
Water conditioning to split emulsions and neutralise detergents
Many garages, petrol stations and supermarkets have car washing facilities such as jet washers and drive through car wash machines. The liquid streams, containing detergents, oils and grease, resulting from the washed vehicles can be damaging to the environment therefore vehicle wash interceptors are required to prevent oil and grease entering watercourses and sewerage systems.
When the outflow of water and oil from a wash bay enters the wash bay interceptor the oil becomes emulsified, due to detergents and hot water. Because the water is no longer free flowing, a standard wash bay interceptor will not separate the oil which would simply pass through the chambers.
Oil removal system
The Morclean oil removal system uses a dosing system to split the emulsions so that the oil can be removed by a filter, therefore limiting the outflow of oils to the mains foul drain. Where the levels and falls are insufficient to outflow to the mains foul drain under gravity, then a Morclean Pumping Chamber can be used.
All our GRP chambers can be made in various pipe sizes, outlet and inlet sizes and invert levels. The chambers are redirected to a 600mm access chamber that can be neatly concealed under a standard Manyway cover and lid.*
The oil filter can even be housed in the third or fourth chamber of the existing interceptor (or standard interceptor) or separate pumping chamber. This all depends on the site specific conditions, every aspect of which we will take into account. The outflow of water can fall to mains foul either via gravity or a Morclean Pumping Chamber can be used to outflow the water along an incline.
*Manway Covers and lids are an added extra as pumping stations are also all available above ground.
Please note: This item requires frames and manhole covers
The above requires manhole cover(s) and lid(s) (not included). Due to the weights involved covers and lids are expensive to transport and often cost more to ship than they are worth so we advise you source your own. You can purchase covers and lids from most builders merchants and below is a guide to assist you choosing the best type for the duty.
Size (mm)DutyEuropean StandardLoadingTypical Overground
|Class A15||600 x 450||Light||BS EN 124||3 tonne (approx)||Cars/Small Vans|
|Class B125||Medium||17 tonne (approx)||Cars/Small Commercial|
|Class D400||Heavy||38 tonne (approx)||Large Commercials/HGV|
Bypass separators fully treat all flows, for the area served, generated by rainfall rates of up to 6.5 mm/hour. This covers most rainfall events. Flows above this rate are allowed to bypass the separator. These separators are used when it is considered an acceptable risk not to provide full treatment for high flows, e.g. where only small spillages can occur and the risk of spillage is small such as on short stay car parks.
In cases where a large spillage might occur, it is not acceptable to use a by-pass separator. The only exception to this is a major trunk road where the size and type of spillage is impossible to foresee and the surface area drained makes it impractical to provide a full retention separator. For major trunk roads a SUDS approach incorporating a number of SUDS techniques is likely to be more appropriate.
On sites where high levels of silt are likely to enter the separator, the build up of silt must not be allowed to compromise the operation of either the separator or the by-pass device. On such sites (e.g. major trunk roads and quarries) an adequately sized silt separation chamber should be installed upstream of the separator and appropriate management systems put in place to monitor the situation and remove the silt when necessary. The use of SUDS techniques can minimise the amount of silt in the surface water run-off.
The EA and SEPA Pollution Prevention Guidelines (PPG) which are jointly produced by the Environment Agency for England and Wales, the Scottish Environment Protection Agency, and the Environment and Heritage Service for Northern Ireland (Ref PPG3 / PPG13 / PPG4 / PPG 14) suggest that Class 2 wash bay silt traps and interceptors should be connected only to a mains foul drain, and Class 1 separators to surface drain.
The above assumes you have the consent to connect any outflow to a suitable drain as per the appropriate PPG Guideline. While we always endeavour to provide best advice and accurate information, it the responsibility of the client and/or landowner to comply with the law. Following any guideline doesn’t remove your responsibility to comply with the law and prevent pollution from your activities. Causing or allowing pollution is a criminal offence; compliance with any guidance isn’t a defence. You should make sure that the references to other sources of guidance are still current.
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Morclean’s quality administration systems have been assured and approved to the standards and guidelines of BS EN ISO 9000:2000 for the sales, service and hire of industrial cleaning equipment.
Our registration no. is 94/121120 and our standards and guidelines are externally audited by CIS.
- Please note that many models described on this website are bespoke, and as such cannot always be accurately depicted.
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