Urban Wastewater Treatment Systems

GÖKSU ARITMA has been involved in the design and implementation of wastewater treatment plants of large settlements in different regions. Our urban-scale facilities range from 10,000 people to millions of people. Urban wastewater treatment plants are made turnkey by our expert team. Our treatment plants can be designed according to the laws and regulations of Turkey, and we also build facilities per European standards and world standards in our international projects.

GÖKSU ARITMA has realized turnkey projects for, bank, municipalities, prefectures, DSİ (The General Directorate of State Hydraulic Works) and their systems are still working today.

Physical Treatment Units

Physical treatment is designed to balance the flow rate oscillations of the wastewater treatment plant, preventing damage to mechanical and electronic equipment to be used in the plant and reducing the pollution load of the plant by providing a pre-treatment in the inlet water.


Coarse Screens


Fine screens


Sand seperators


Equalization ponds


Sedimentation ponds



Chemical Treatment

Chemical treatment is the application of some general methods based on the use of various chemical reactions to ensure or accelerate the removal of dissolved, colloidal, and suspended substances that cause pollution in wastewater.

Biological Treatment 

A method, which is based on the consumption of organic and some inorganic pollutants by the microorganisms in wastewater. They remove the pollutants from wastewater by using them as food and energy source. Some of the organic substances are converted to microorganisms, and some of them are consumed to provide energy for the microorganisms.

Aerobik Processes

Aerobic processes are processes in which purification takes place in an oxygenated environment. These processes are classified according to the location of microorganisms, as suspended growth, bound growth, and combined system in which the two are applied together. There are also sequential systems where multiple processes are used consecutively. In suspended growth systems, the oxygen requirement of microorganisms is met by various types of aerators.

Anaerobic Prosesses

Airless purification (anaerobic) processes are based on the biochemical separation of organic substances in an oxygen-free environment. The biogas generated during the treatment consists of approximately 65-85% methane and 15-35% carbon dioxide.

Activated Sludge Process

It is a method in which organic pollution is eliminated by suspended microorganisms. It is essential to keep microorganisms suspended in the mixed liquid in the activated sludge pool. Wastewater is biologically treated in activated sludge plants, which can be designed with a completely mixed flow reactors or plug flow reactors.

Advanced Treatment

Advanced and/or final treatment is generally the treatment applied to further improve the quality of wastewater from classical biological treatment. Advanced treatment can include nitrogen and phosphorus removal, filtration, adsorption, disinfection, ion exchange, and membrane technologies.

Nitrification and Denitrification Systems

The main purpose of activated sludge plants is the removal of carbonaceous organic substances. However, nitrogenous substances that produce BOD can also be oxidized. Of the nitrogen compounds in question, the most important is ammonia. By nitrification process, ammonia is biologically oxidized to nitrate. In practice, the nitrification process can also be achieved in the reactor used to remove organic carbon substances. Denitrification, on the other hand, is the process of converting nitrate into nitrogen gas by breaking it down under oxygen-free conditions, after the oxidation of nitrogen compounds to nitrate.

Other biological treatment methods


Stabilization Ponds System


Anaerobic Stabilization Ponds


Facultative Stabilization Ponds


Suspended and fixed bed biological reactors


Membrane technologies

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