| Specification | STP | FSTP |
| Full Form | Sewage Treatment Plant | Faecal Sludge Treatment Plant |
| Purpose | Designed to treat sewage water which may include human waste, chemicals, solids and oils. | FSTP addresses only faecal sludge. |
| Source | Sewage waste generated from residential, institutional, commercial and industrial establishments | Human waste collected from pit latrines, septic tanks and other on-site sanitation system |
| Motive/ Goal | To treat and remove pollutants (organic matter, pathogens, harmful substance) making water suitable for discharge/ other reuse applications. | To reduce the volume of sludge, eliminate pathogens and produce a stabilized, sanitized & potentially reusable end product or otherwise which can be handled/ disposed off safely. |
| Treatment processes | Treatment processes usually employed are screening, settling, biological treatment and disinfection. | Most commonly used processes include anaerobic digestion, composting, disinfection and aerobic treatment. |
| Volume | High volume of influent is treated. | Low volume of influent is treated. |
| Contaminants | Waste contains high amounts of oil, chemicals and organic content. | Waste contains higher solids/ sludge content. |
| O&M | O&M requirements are similar. | O&M requirements are similar. |
| Effluent quality | High quality of effluent achieved. | Low quality of effluent achieved. |
| Application after treatment | The treated effluent is used for irrigation purpose. | The treated effluent is used for agricultural purposes. |
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