Sewage Treatment Plants

We sell a wide range of Sewage Treatment Plants from market-leading brands such as Graf, Clearwater and WPL. Sewage Treatment Plants are used in properties that are not connected to a mains drainage system. They collect effluent from household foul drainage systems (WC's, Kitchens, Bathrooms etc) and usually separate it into two chambers, solid and liquid.

How Sewage Treatment Plants Work

The liquid (effluent chamber) is treated using a variety of mechanical and/or chemical processes depending upon the specific system, stimulating helpful bacteria which "clean" the effluent. The resultant "cleaned" liquid, which is generally around 95% clean water, can then be returned to a ditch or natural watercourse. The remaining sludge is removed from the solid chamber by specialist companies on a regular basis as required.

Sizing of Sewage Treatment Plants

STP's are sized on the amount of persons living in the property or properties that use the STP. Often the treatment plant will be connected to a number of common properties, so we currently offer systems that are up to 55 person occupancy.

Pumped and Gravity Fed

Most STP's have either a gravity fed or pumped option for disposing of the cleaned water. With our Graf and Clearwater Sewage Treatment Plants, an optional pump can be purchased for use with the standard gravity outlet plant. With the WPL tanks there are individual tank options for either pumped or gravity fed.

Does a sewage treatment plant need a soakaway?

Although soakaway crates are innovative and effective for discharging stormwater and rainwater back into the ground, we would not recommend using soakaway crates alongside your sewage treatment plant or septic tank – doing so would actually be illegal.

The crates are not designed for use with untreated or any form of wastewater, and neither would we encourage the release of this water back into such concentrated areas of the ground.

Untreated water can be foul smelling and hazardous, so the release of this through soakaway crates back into public drinking water boreholes will only cause further trouble.

Do sewage treatment plants need emptying?

Although sewage treatment plants can deal with more wastewater than septic tanks, they will still need occasional emptying.

Many manufacturers recommend annual emptying due to the build up of sludge within the system. Sludge is a build-up of solids within the tank, and must be removed periodically, as too much of this contamination will result in unclean water, defeating the purpose of the sewage treatment plant. If you’re unsure how often to empty your treatment plant, you should get in touch with your supplier or retailer, as some lower budget options may need more frequent emptying.

Delivery

For details on delivery and returns of this product range, please consult the Delivery & Returns tab.