How does sewage treatment work?

Sewage treatment is one of the most common forms of controlling pollution in the world. Wastewater from homes and businesses is collected by sewers and delivered to plants for treatment. But how exactly does sewage treatment plants operate? Essentially, the process involves circulating air to promote the growth of bacteria that then breaks down sewage. The objective is to deliver more environmentally friendly effluent.

Sewage Treatment Steps

There are three main stages that wastewater has to go through to be considered safe for the environment and human consumption: primary wastewater treatment, secondary wastewater treatment, and tertiary wastewater treatment.

Step 1: Primary Wastewater Treatment

At this stage, the sludge and the organic matter has to be separated from the rest of the wastewater. To this end, the wastewater is made to go through a large settlement tank where the grease and oils rise as the solids go to the bottom. The grease and the oils are then skimmed off the top surface while the sludge is gathered at the centre of the settlement tank’s floor and pumped away as the rest of the wastewater flows to the secondary treatment are for further purification.

Step 2: Secondary Wastewater Treatment

As the wastewater flows to this area, it still contains some sludge that did not settle to the base during the first stage. The objective of this wastewater treatment stage is to break down the remaining bits of sludge. To this end, the air is pumped into the water to encourage the growth of bacteria which then breaks down the bits of sludge that could not be removed from the wastewater in the settlement tank. The more the air is pumped into the wastewater at this stage, the faster the multiplication of the good bacteria, and the more efficient the entire process becomes.

Step 3: Tertiary Wastewater Treatment

The purpose of the tertiary wastewater treatment stage is to improve the quality of the wastewater before the sewage tank is emptied so that it can be reused or released to natural water bodies such as rivers, seas, or lakes. It involves getting rid of inorganic pollutants such as phosphorous and nitrogen. Bacteria and viruses that could be harmful are also removed to make the water safe for human consumption. Once this process is complete, the water is clean enough to be released back to the environment and even to be consumed by humans.

In Conclusion

As you can see, sewage treatment is one of the most important ways of taking care of the environment. It involves making sure that the wastewater from industries and home is safe for the environment and human consumption. In the past, nature handled the process on its own. But with the large volumes of wastewater produced in today’s industrialized world, we need to give nature a helping hand. If you are looking for an expert to help you with the installation of a sewage treatment tank in the UK, Septic Tanks North West is your best bet. Feel free to contact us today for more information about our company and the services that we offer.