The most common types of wastewater treatment plants are effluent treatment plants (ETP), sewage treatment plants (STP), and common and combined effluent treatment plants (CETP).
Effluent treatment plants (ETP) are usually used by industries with high manufacturing capacities, such as textile, pharmaceutical, and chemical industries, etc. containing organic or inorganic wastewater or a combination of both with high COD, TDS, and extreme pH, making the wastewater highly toxic.
Effluent treatment plants are selected and designed according to the type and volume of incurrent industrial effluent.
Sewage treatment plants remove contaminants from domestic wastewater, such as residential colonies, institutions, hospitality industries, etc.
STPs contain wastewater with a high amount of organic material that can be treated without much difficulty.
Common effluent treatment plants (CETPs) are designed to treat wastewater from various small-scale industries that are not able to treat effluents on-site at a common effluent treatment plant.
CETPs are usually constructed in industrial estates or industrial development corporations (IDC).