Process Description
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Grey water or waste water is treated in 3 phases:
- Primary- Solid Removal
- Secondary- Bacterial Decomposition
- Tertiary- Extra Filtration
Primary Treatment
The purpose of primary treatment is to settle material by gravity, removing floatable objects, and reducing the pollution to ease secondary treatment. Primary Treatment aims to reduce the Biochemical Oxygen Demand (BOD) and Total Suspended Solids (TSS) in the wastewater.
Various equipments used for the primary treatment of waste water are:
- Bar screen chamber
- Oil/grease removing chamber
- Oil skimmer etc.
- Membrane Bioreactor (MBR)
Secondary Treatment
The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids. It involves the removal of biodegradable organic matter (BOD) and suspended solids (TSS) through the processes of aeration and filtration. It removes about 85% of the organic matter in sewage by making use of the bacteria in it.
Various technologies used for Secondary treatment are:
- Activated Sludge Process (ASP) / Extended Aeration System (EAS)
- Sequential Batch Reactor (SBR)
- Moving Bed Bio Film Reactor (MBBR)
- Membrane Bioreactor (MBR)
Tertiary Treatment
Tertiary treatment is the next wastewater treatment process after secondary treatment. This step removes stubborn contaminants that secondary treatment was not able to clean up. Wastewater effluent becomes even cleaner in this treatment process through the use of stronger and more advanced treatment systems. This treatment removes the load of nitrogen and phosphorus present in the water.
Various processes involved are:
- Filtration
- Ion exchange
- Activated carbon adsorption
- Electro dialysis
- Nitrification
- Denitrification
- Disinfection