According to the above contract, technical services and studies related to the study of the Shahreza wastewater treatment plant upgrade plan have been assigned to this consultant.

The purpose of conducting design studies for the Shahreza wastewater treatment plant is based on the latest design criteria, environmental standards, and state-of-the-art technology.

In the Shahreza wastewater treatment plant upgrade plan, raw wastewater is first directed to the coarse and then fine-grained garbage collection unit. After separating suspended matter to remove particles with an average diameter of 0.2 to 0.1 millimeters, the wastewater enters the granulation unit.

After the removal of granular matter, raw wastewater enters the biological treatment system to reduce the concentration of organic matter and to complete the treatment process, which includes aerobic, intermediate sedimentation, and final sedimentation units. Finally, the effluent from the final sedimentation unit enters the disinfection unit.