Pre-treatment is a process where a facility reduces, alters or eliminates pollutants in wastewater discharge prior to release of the water to the central effluent treatment plant (CETP). The pre-treatment process may or may not generate sludge.
Some of the pre-treatment examples include, but are not limited to
- pH adjustment
- Filtration
- Biological treatment of the wastewater and other physical/chemical processes.
The processes below, when installed as a standalone system, cannot be considered as pre-treatment:
- Grit removal with the mesh size >6mm
- Equalisation tank/homogenisation tank (if no chemicals are added in the equalisation tank/homogenisation)
The processes below, when installed as a standalone system, to be considered as pre-treatment:
- Grit removal with the mesh size <6mm
- Equalisation tank/homogenisation tank (if chemicals are added in the equalisation tank/homogenisation)