Links:
[1] http://admin.indiaenvironmentportal.org.in/books/monitoring-septage-addition-waste-water-treatment-plants
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/us-environmental-protection-agency
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wastewater-treatment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-treatment-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage