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Wastewater (wastewater treatment methods) is the use of physical, chemical and biological processes for wastewater treatment, wastewater purification, pollution reduction, as well as achieve the wastewater recycling and reuse, make full use of water resources. Physical processing methods By physical separation, suspension of insoluble in recycling waste water pollution Pollutants (including oil and oil drop) wastewater treatment can be divided into gravity separation methods, centrifugal separation and sieve retention method. Based on the principle of heat exchange processes were also belongs to a physical process.