industrial wastes (2) sewage (3) agricultural chemicals and wastesMany industrial countries around the world discharge pollutants that are toxic and very harmful to the environment. Industries discharge much chemical waste directly into natural bodies of water. Many factories in the US use water from rivers in their cooling systems. When the water is returned to the rivers, the temperature of the water can be up to 10 DEGREES or warmer creating catastrophes for the marine life. In addition, the burning of coal, oil, and other fuels by power plants, factories, and motor vehicles releases sulfur and nitrogen oxides into the air. These pollutants cause acid rain, which ENTERSSTREAMS and lakes. High levels of mercury have been found in fish far from industrial areas. The main sources of the mercury appear to be emissions to the atmosphere from coal-fired boilers, municipal incinerators, and smelters.Industrial waste is the waste produced by industrial activity which includes any material that is rendered useless during a manufacturing process such as that of factories, mills, and mining operations. It has existed since the start of the Industrial Revolution.[1] Some examples of industrial waste are chemical solvents, paints, sandpaper, paper products, industrial by-products, metals, and radioactive wastes.Toxic waste, chemical waste, industrial solid waste and municipal solid waste are designations of industrial waste. Sewage treatment plants can treat some industrial wastes, i.e. those consisting of conventional pollutants such as biochemical oxygen demand (BOD). Industrial wastes containing toxic pollutants require specialized treatment systems. (See Industrial wastewater treatment).[2]
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