The process of removing the bulk of impurities from sewage or waste water results in the production of both sludge and liquid effluent that can be disposed of in the environment. The goal of STP testing is to provide a solid waste stream that may be recycled or disposed of, as well as a fluid waste stream that is safe for the environment.
Effluent is the liquid waste that is expelled from various parts of the plant. Depending on the type of effluent, different effluents require different treatments. The industrial waste water treatment facilities are built to offer a workplace free of pollution and recycle water for use in other applications.