How does a sewage treatment plant work?

Updated: Jul 4




Sewage is soiled water from sinks, showers, bathtubs, toilets, washing machines and dishwashers. There is only a certain amount of sewage and pollution nature can cope with, which is where treatment plants come into play.


Having a working sewage treatment plant is essential to any business or homeowner, especially if your property is located further away from the water mains connection. The goal of a sewage treatment plant is to deliver much cleaner, more environmentally friendly effluent that can be discharged safely into a watercourse.


How does it work?


Sewage treatment solutions treat used water in different stages: Primary, Secondary and Tertiary.


During primary wastewater treatment, sewage flows from the property being serviced into the first chambers of the sewage treatment plant. The water sits here until the grease, oil and scum have floated to the top and solids have settled on the bottom. Once settled, these materials are held back while remaining liquid is discharged to the more vigorous secondary stage of the wastewater treatment.


Once the process of separation has taken place, the secondary wastewater treatment occurs where the liquid travels into the second chamber, fitted with an air pump which circulates air around the chamber to encourage growth of aerobic bacteria. This bacteria helps to break down the contaminants in the water, effectively cleaning it.


The final tank allows the last solids that remain to sink to the bottom of the tank before the effluent is discharged into a soakaway or watercourse. The aim of tertiary wastewater treatment is to raise the quality of the water to domestic and industrial standards, or to meet specific requirements around the safe discharge of water. It involves the removal of pathogens, which ensures that water is safe for drinking purposes.


Once the treatment process has taken place, it can be discharged into the environment. As effluent leaves the final waste chamber it is 95% clean. Depending on the local ground conditions and the final effluent quality required by the local Environment Agency (England and Wales) or Scottish Environmental Protection Agency (Scotland), discharge can be directly into a water course.


How can we help?


​​We supply and install sewage treatment plants. We also provide a regular maintenance service to ensure your system stays in tip top condition.


Through our planned maintenance service, our team of experienced and qualified sewage treatment specialists will be able to identify any common faults, such as an under-performing system or bacterial growth. We will also help solve issues before they occur as well as ensure your system is working to its full potential.


We service all makes of sewage treatment systems, including Klargester, Titan, KEE, WPL, Enso, Conder, Bio Pure, PureFlo, Biorock, Allerton, Acorn, Uni, Ensign, Entec, Moduline etc.


Our team of specialists can provide you with expert advice. Call us today on 0121 461 4861.



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