How Wastewater Treatment Is Handled

No country or civilization can survive without water. It is an artery for all life. One important aspect of maintaining the water supply is through proper wastewater treatment.

The basic function of any wastewater treatment facility is to accelerate the natural way in which water purifies itself. This is achieved through the various stages of treatment called initial, secondary, and tertiary. You can also navigate to to know more about wastewater treatment.

Initial Treatment

Sanitary sewers carry wastewater to the facility. The sewage passes through two mechanically cleaned bar screens that emit a large floating object, such as paper or a stick. The wastewater is then pumped to the aerated grit tank where sand, gravel, and other high-density solids settle. Unwanted debris is lifted from all tanks and deposited into other containers.

Secondary Treatment

After screening and grit removal, wastewater still contains dissolved organic and inorganic materials together with suspended solids. In the next treatment step, the water flows into three aeration tanks.

Aerator at the bottom of the tank maintains the oxygen required for bacteria that maximum productivity. The wastewater then continues to clarify. In the tank, solids settling, and cleaning fluids flow over the weir wall outlet.

Tertiary Treatment

After the water passes over the weir, lime is added to adjust the pH of the water. The water then passes to three secondary aeration tanks. In this process, special bacteria convert protein and ammonia present in the wastewater into a form of nitrogen that will not hurt the environment.

Finally, the flow of water through four filters anthracite, which trap fine particles that may remain in the wastewater. After filtration, chlorine is added to kill disease-causing bacteria that may be present.

The water is then released, usually to a flowing river, where the natural treatment process itself will continue to remove the small amount of remaining waste.