East Anzali Wastewater Treatment Plant

Project Overview

East Bandar Anzali Wastewater Treatment Plant is being built with the aim of preventing pollution of the Anzali Wetland, rivers and the Caspian Sea.

This treatment plant, which has a capacity of 12,000 cubic meters per day, can treat the domestic wastewater of 57,000 people in the city, which can be increased to 120,000 people.

Anzali Wastewater Treatment Plant process is activated sludge and the type of biological system is A2O.The main units of this treatment plant include a degreasing and fat removal unit (2 units), a circular primary sedimentation unit (2 units), a sewage pumping station, a biological unit (2 units), a circular sedimentation unit (2 units), a coagulation unit (2 units), a gravity sand filtration unit (4 units) and finally disinfection by UV radiation. The advantage of this treatment plant over other treatment plants being designed and built in the country is the construction of coagulation and gravity sand filtration units (as supplementary treatment) and an odor removal and control system.

Treatment Plant Process

Usually, the first unit in a wastewater treatment plant is the sludge collection unit. In the Anzali wastewater treatment plant, this unit is seen in the pumping system located adjacent to the treatment plant site. After the pumping station, the wastewater enters two granulation system units along with air, and after the grains are removed, the flow enters two primary sedimentation pond units. Suspended solids are removed up to about 50% in these units, and after the wastewater loses its coarse suspended particles, it enters two aeration units. The main operation, which is the biological treatment of wastewater, takes place in these units. Then the wastewater enters two secondary sedimentation pond units. Final clarification takes place in these units. At the end of the clarification process, a gravity sand filter unit is designed as a supplementary treatment. In this unit, all suspended solids remaining in the flow are removed and fed into two UV disinfection system units, then exited the treatment plant and entered the Anzali Wetland, which is one of the most valuable and important wetlands in the world and has international environmental value.

Project Statistics