Secondary treatment removes 85 to 90% of BOD, TSS and the small portion of nitrogen, phosphorus and heavy metals from wastewater. Tertiary treatment is the third stage of the wastewater treatment and is also known as the advanced treatment. Tertiary treatment removes the load of nitrogen and phosphorus present in the water. It includes processes like filtration, ion exchange, activated carbon adsorption, electrodialysis, nitrification, and denitrification.

Treatment options in tertiary treatment depend upon the characteristics of effluent after secondary treatment and what kind of water is needed at the end of the treatment. For example, if we need potable water then filtration and disinfection are to be done on the wastewater.

Filtration process

Filtration process removes the particulate matter by passing water through the porous media. The filtration process consists of different type of media which is usually made up of sand, gravel and charcoal. There are two types of sand filtration slow sand filtration and rapid sand filtration. Read More…


Membrane process

Membrane technology is used to treat variety of wastes including sewage, organic and inorganic matter and water soluble oil wastes The membrane processes are classified on the basis of driving force and separation mechanism such as Multi Filtration (MF), Ultrafiltration (UF), Nano filtration (NF), Reverse Osmosis (RO), and Forward Osmosis (FO). Read More…

UF 1

Advanced oxidation system

Ozone is introduced in the process to destroy microorganisms and degrade organic pollutant. Ozone gas (O3) is formed by passing oxygen through a high voltage electric field. Nowadays ozone is the widely used disinfectant after chlorine. Read More…