A Sewage Treatment Plant is a facility that treats wastewater before discharging it into the sewer system. The sewage entering a treatment plant can be filtered and processed using several methods. The first method is aeration. Aeration works by forcing sewage into a chamber and through a pump. Aerobic bacteria then treat the water. The aerobic bacteria also reduce other contaminants, such as detergents and humus. The resulting sludge is then removed periodically to maintain the health of the wastewater.

The second method of treatment is chemical digestion. This method involves breaking down solid matter in the wastewater.