Sewage Treatment Systems
- Septic Tanks
- Treatment Plants
- Cess Pools
A septic tank is the usual choice as it is generally cheaper and easier to install than the other options. A septic tank is a large underground tank usually made of concrete or glass reinforced plastic (GRP). The waste flows into the tank where the solids settle to the bottom and are separated from the liquids. The liquids get broken down and purified in the tank and become what is known as effluent. The effluent then flows into one or more soakaways where it drains away into the ground. The solids need to be pumped out at least once a year but this is not expensive or difficult.
Septic tanks are low maintenance and have no moving parts. However, the ground for the soakaways must be porous enough to allow the effluent to completely drain away. A high water table or clay will often mean that a lift pump is necessary to pump the effluent to a suitable area. A septic tank may not be allowed if there are any nearby water courses that might get conaminated. A local authority building inspector must give approval for the installation of a septic tank.
A sewage treatment plant can be used in cases where (because of nearby water courses for example) the effluent from a septic tank cannot be drained away. A sewage treatment plant will clean the effluent to a much higher standard than a septic tank. A treatment plant will further purify the effluent with aerobic bacteria. However, treatment plants are more expensive, require an electricty supply (to drive a pump to introduce air into the plant to enable the growth of bacteria) and need annual servicing.
A reed bed can sometimes be used as an alternative to a powered solution. Here the reeds further purify the waste from a septic tank.
Sewage treatment plants will need approval from the local authority and possibly the Environment Agency (depending upon the likelihood of polluting surface water or groundwater). Generally, approval will be dependent upon a commitment to regular servicing as specified by the manufacturer of the treatment plant.
If the above solutions are not permissable then a cess pool may have to be used. Here all the waste is contained within a sealed tank which is pumped out on a regular basis (several times a year).
Farley Groundworks are experts in the installation, maintenance and upgrade of septic tanks, treatment plants and cess pools. We are able to design and install a cost effective solution to meet most needs. Contact us for a free consultation.