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Industrial wastewater is generated from the utilization of water in industrial operations like processing, cleaning and cooling activities. Common sources of surplus industrial wastewater include agricultural waste, breweries, dairies, mines and quarries, and paper–pulp, iron–steel, food and chemical, and nuclear industries. Hence there is a quintessential need to treat/recycle wastewater to mitigate the industrial pollutant content, before disposing of it or returning it to the natural ecosystem. Industrial wastewater can be treated through various methods using physical, chemical, thermal or biological means, adopting sequential stages like primary, secondary and tertiary treatments. In this chapter, the various sources of industrial wastewater and the treatment technologies (conventional and advanced) currently being practised for mitigating wastewater pollutants are described briefly, along with a note on the associated challenges involved.

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