ABSTRACT
Environmental technology, which was widely applied in environmental management, is covering the technological methods that are able to solve almost exclusively pollution problems from point sources. Impact on aquatic ecosystems from point sources is originated from discharge of wastewater. Industrial wastewaters can cause the same water pollution problems as municipal wastewater plus a few more. Corrections at a later stage, when pollution has already degraded the water quality and associated ecosystems, are possible, but will always be more expensive than the costs of proper wastewater treatment at an early stage. Develop models for the impacts of the wastewater on freshwater ecosystems, considering the impacts on the water quality and the entire lake ecosystem. The composition of domestic sewage varies surprisingly little from place to place, although it to a certain extent reflects the economic status of the society.
