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SITE PREPARATION


Action stations


If you’re building a dream home away from it all in a beautiful countryside location, it may mean no access to the mains sewer; Dan Berry from Harlequin Manufacturing explains why packaged pump stations are a simple answer


I


f a pumping solution is needed on a property, due to it having no mains sewer connection, normal practice in


recent years has been to build a chamber made from concrete rings, fitted with equipment including pumps, pipes, and valves. But this is very time consuming, and can create several challenges. You can now get the same solution built


and ready to be installed, in the form of a packaged pump station, which presents a much more efficient, cost-effective, and long-lasting solution. They save significant time and cost, being able to be installed very quickly. A pump station is effectively a collection tank designed to transfer sewage, effluent or surface water to a local drain, private manhole or mains sewer when they are located higher than the domestic sewage plant. Pump stations are also used to remove wastewater from residential properties that do not have access to the main sewer; some homes are already connected to a private pump station before they connect to the main sewer.


Whenever the main sewer sits on higher ground than the domestic sewage plant, the sewage needs to be transported to the main sewer. This is where sewage pump stations come into the picture


jul/aug 2021


HOW IT WORKS


A pump station comprises a large tank – also known as a wet well – that acts as the receiver for sewage from a house or a group of houses, until it reaches a predetermined level. The pump is located in the bottom of the chamber, activated by a float switch when liquid waste reaches a certain level. The waste is pumped through an MDPE pipe up to the outlet connected to the mains sewer. Once the liquid waste level has dropped below the float switch threshold, the pump stops. A non-return valve is built in to ensure that the liquid waste cannot return to the chamber once pumped up to the higher level.


TYPES OF PUMP STATIONS Single effluent pump stations comprise a single pump, designed for liquid effluent only. They are often placed after a domestic sewage treatment plant to pump the treated effluent to a watercourse or field drainage. Twin effluent pump stations consist of two pumps and a control panel. Twin


pumps can cope with much bigger amounts of liquid. They are often used for surface water on sites where ground conditions aren’t suitable for soakaways, or for larger commercial treatment plant to pump the treated effluent to a watercourse or field drainage. Single sewage pump stations comprise a single vortex pump, designed for solid and liquid waste. They are mostly used on a single dwelling or an extension, to pump sewage to a private manhole cover. Twin sewage – Twin sewage pump stations use two vortex pumps designed to cope with solid and liquid waste. They also include a control panel. Twin pumps are mostly used on larger domestic dwellings or multiple dwellings that are discharging to the mains sewer. Single grinder – Single grinder pump stations use a single pump, designed for heavy solids and liquid waste. They are often used to reduce the amount of liquid entering a mains sewer as the water authorities in certain areas are very strict about the quantity of liquid entering the mains sewer system.


www.sbhonline.co.uk 33


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