Wastewater Treatment consists of a combination of physical, chemical, and biological processes and operations to remove solids, organic matter and, sometimes, nutrients from wastewater. Wastewater is water that has been used and must be treated before it is released into another body of water, so that it does not cause further pollution of water sources.
Wastewater comes from a variety of sources human waste, rainwater and runoff, along with various pollutants, go down street gutters and eventually end up at a wastewater treatment facility. Wastewater can also come from agricultural and industrial sources. The treatment process can range from relatively simple to very complex. The specific process used for treatment will vary with the source and volume of wastewater to be treated.