Wastewater treatment, collection, and discharge are essential to protect human health, the environment and surrounding water quality. Before it can be treated, wastewater needs to be collected from sewer networks servicing homes, municipal, commercial and industrial premises, including rainwater run-off from roads and other impermeable surfaces. Wastewater treatment is also evolving. Historically, it was designed to clean up wastewater before a cleaned up effluent could be discharged safely into the surround area. Today, wastewater is being seen a valuable resource to generate: energy, nutrients and water for irrigation, industrial and even drinking purposes. These articles provide everything you need to know about the different treatment stages and technologies involved in wastewater treatment.