Links:
[1] http://admin.indiaenvironmentportal.org.in/news/convert-treatment-plant-cetp
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/tribune-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-plants-stp
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-waste
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ludhiana-d
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/common-effluent-treatment-plant-cetp