Biotank Limited

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If you are looking for a solution to one of the
following we can help.  Our company specialises
in sewage, we are experts in sewage, even passionate
about sewage.

Our aim is to provide solutions that meet with
your particular requirements.

▪ Domestic Sewage Treatment
▪ Commercial Sewage Treatment

▪ Machinery Washdown Water Recycling
▪ Bacterial Treatment of Wastewater & Odour Control products
▪ Rainwater Harvesting

Give us a call.  Let us ask you some questions to see if we can help find the right solution for you.

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Septic tanks either work or they don't. If they work correctly then they are a very good system.

Some of the things that septic tanks rely on are:

Soil conditions that provide good percolation.
Surface water directed through the septic tank to flush it through.
Reasonable water temperature to keep it working in the winter.
Little use of chemicals which kill off bacteria.

When a septic tank system goes wrong you have big problems...



Very straightforward. Domestic sewage is put into one side and treated effluent, suitable for discharge into a ditch or soakaway, comes out the other.



Quite simply really! Use bacteria to digest sewage in an aerobic environment.

Modern Sewage Treatment tanks make use of aerobic digestion, air is normally supplied by a very small noiseless compressor through aerators in the bottom of the tank. Another method is to have rotating discs within the centre of the tank. Aerobic digestion produces heat. Aerobic digestion also produces carbon dioxide and new bacteria or biomass.

The result, clean water in the discharge:

Basically septic tanks provides a "holding Tank" where natural bacterial action decomposes human waste products into environmentally acceptable components - the major end-components being water, gases, and undigested solids. The end products, except the undigested solids, are then normally discharged into a soakaway system.


The most obvious components are the sinks, toilets, washing machines, baths and showers and the pipe work. The parts that are not so obvious are the underground components. Most people know where their tank itself is but are not sure of the situation of the soakaway.

Bacterial action takes place in septic tanks where the end products are mainly water, gases, and undigested material, called sludge, that sinks to the bottom of the tanks, and scum, that floats to the top of the tank. Septic tanks contains baffles that prevent any scum and sludge from passing out of the tank. The gases that are generated vent to the atmosphere via a vent. From septic tanks, the segregated and relatively clear liquid flows into a small distribution box where it is then metered out to several perforated pipes. These perforated pipes then deliver the liquid to a large soil surface area, called a soakaway, for absorption. The soil also acts as a filter to remove any small amounts of solids that may be carried along with the liquid. The sludge in the bottom of the tank must be periodically pumped out and properly disposed of.


If you have a property and don't know where the tank is located then the easiest method is to find the sewer pipe that leaves the house. The tops of the septic tanks are usually about 10 to 20 feet from the house, but can be a long way down a garden if you have acres of space! Normally the tank will be concrete or steel just below the surface. There is normally a manhole cover on top of the tanks.
From the tank outlet there will be a series of pipes that direct the liquid into trenches called laterals. The pipes in the laterals are perforated to allow the liquid to percolate out into the surrounding soil. They are usually surrounded by pea shingle or other porous material. One of the purposes of the stone is to allow the liquid to percolate downwards into the soil slowly and thus be treated by the bacteria in the surrounding soil. Please see the percolation test area of our site for more information on this aspect.

Septic Tanks for Sewage Treatment

Packaged Treatment tanks for Sewage Treatment

How does a packaged treatment tank work?

How does the tank treat sewage?

How do septic tanks work?

What makes up a septic tank system?

Where are these parts of the system located?

Septic tank sewage systems make up a large proportion of the installed base of private sewage treatment systems in the UK.


Septic tanks are a treatment system that is designed to safely dispose of biological sanitary waste.

What are septic tanks?