1. American Public Health Association (2017) Standard method for examination of water and wastewater, Part—5220 (C)
2. Central Pollution Control Board (2022) National inventory of sewage treatment plants. https://cpcb.nic.in/status-of-stps/. Accessed 1 Oct 2022
3. Fenxia Y, Ying L (2009) Enhancement of nitrogen removal in towery hybrid constructed wetland to treat domestic wastewater for small rural communities. J Ecol Eng 35:1043–1050
4. Indian Standard (1987) Methods of sampling and test (physical and chemical) for water and wastewater, IS 3025—Part 1
5. Indian Standard (1989) Methods of Sampling and Test (Physical and Chemical) for Water and Wastewater, IS 3025—Part 38