The treatment techniques used to treating wastewater are based on the knowledge and design application of the treatment process required. This varies depending on the kind of wastewater being treated.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/common-effluent-treatment-plant-helps-industrial-sectors-treat-effluents
[2] http://admin.indiaenvironmentportal.org.in/category/author/yudhistra-kumar-0
[3] http://admin.indiaenvironmentportal.org.in/category/journal/water-today
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/common-effluent-treatment-plant-cetp
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-waste-treatment
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology