The artificial removal of pollutants from sewage, their transformation into an inert state, and the altering of the objectionable constituents by controlled physical, chemical, or biological processes.
The processing of wastewater for the removal or reduction in the level of dissolved solids or other undesirable constituents.
Mechanical treatment of sewage in which large solids are filtered out by screens and suspended solids settle out as sludge in a sedimentation tank.
The process of purifying wastewater from rural, urban, and industrial communities. Wastewater contains suspended or floating material, dissolved material, odor, color, and microorganisms.
primary = screening or settling large solids out of sewage (only removes visible material) secondary = removal of organic material in sewage by aeration and bacterial action tertiary = removal of nutrients and traces of toxic organic material from sewage by additional treatment processes
Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants from sewage. It includes physical, chemical and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce a wastestream (or treated effluent) and a solid waste or sludge also suitable for discharge or reuse back into the environment.