THE SEWAGE TREATMENT PLANT

After the used water leaves our homes it goes through the sewerage system to the Sewage Treatment Plant (STP). Here Mother Nature’s biological processes are used but they are speeded up.

Natural bacteria are given optimum conditions to enable them to carry out their chemical transformations quickly and efficiently.

In more advanced plants several types of bacteria requiring varying conditions are used to reduce the amounts of the pollutants. The wastewater therefore passes through several zones where the different conditions are provided.

Plants vary in size and complexity and so does the quality of their products — effluent (the liquid part) and biosolids (the solid part).

Sewage treatment plants vary in size and complexity and so does the quality of their products - effluent and biosolids.