What are the specific ways through which water pollutants enter the environment?
Discharge of sewage water represents a mayor global source of pollution. Domestic and industrial wastes are discharged unto surface water through sewage systems. In some cases industrial waste is released directly unto surface water. The quality of sewage water that enters the surface water depends upon the pollutants that are present in the sewage water and the extend to which it is treated before it is brought in contact with surface water. Domestic sewage water mainly consists of paper, soap, urine, faeces and detergents. Industrial wastes are varied and depend upon the specific processes of the plants that they origin from. Heavy metals are associated with mining and smelting operations, chlorophenols and fungicides with pulp mills, insecticides with mothproofing factories, several different organic chemicals with the chemical industry and radioactive substances with nuclear power plants. On land the releases of industrial waste are closely controlled, but offshore oil and manganes
