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Heat & Hot Water 

Vortex ASP Packaged Treatment Plant Installation

Project Completion Date: April 2015


We were asked by one of our customers to install a packaged treatment plant to replace an older, less environmentally friendly septic tank system.

The packaged treatment plant that we installed is based on the Activated Sludge Process (ASP), which is essentially a miniature version of the treatment process used in large municipal sewage treatment works. Raw sewage enters the digestion chamber (biozone) and air, supplied by a linear motor compressor, is fed through a fine bubble diffuser into and through the effluent. This breaks down the solids into a slurry and a bacterial 'soup' forms, digesting the pollutants. The final clarification chamber settles out the live and dead bacteria. The live bacteria sink and are returned to the digestion chamber and the dead bacteria float, form a crust which is re-cycled automatically. The clean water is then soaked into the ground using a sub-soil infiltration system.


The installation comprised of many steps, the first being that we dug 3 percolation test holes in the garden which gave us a way of calculating the size of the sub-soil infiltration network needed.


After these calculations were made, a final scope of works was created and the installation could begin.

We had to dig trenches in the garden in order to run the cabling and pipe work underground to the location of the treatment plant.

After this we had to excavate a 1.5m deep and 2.0m diameter hole for the plant to sit in. It was then levelled with a layer of blinding concrete to create a firm, even base. The Vortex ASP plant was then installed into this excavation ready for the next stages.

We then had to dig a rectangular trench that was 300mm wide and 700mm deep for the sub-soil infiltration system. Within this trench we then placed the Poly-Bed pipe work which allows the treated effluent from the plant to be absorbed into the ground.

The installation was inspected by the Building Control Officer from Mendip District Council and we then backfilled and reinstated the trenches. We then removed all waste from site to our local landfill site.