Sewage Treatment Plant is useful for recovering clean water from wastewater. Two wastewater treatment plants are there, they are chemical or physical treatment plant and biological wastewater treatment plant. Biological waste treatment plants use biological matter and bacteria to breakdown the wastewater. Sewage Water formed by a number of activities including bathing, washing and rainwater runoff. Wastewater is full of contaminants including chemicals, bacteria and other toxins that can harm the environment.