Ahwaz city is divided into two eastern and western parts via Karoon River which
is the only navigable river in Iran. The river not only supplies Ahwaz
inhabitants with drinking water but also provides the water required for
agriculture and industries in the area. Mãleh stream, 5 km from the city, is
located in north - south direction and ultimately pours into shãdegãn lagoon
after traversing some 80 kilometers. Human sewage which pours into this stream,
got water and sewer authorities of Ahwaz city provide the requirements to stem
the entrance of wastewater into the stream; they also planned to treat the
wastewater and discharge it into the stream.
The plant’s daily treatment capacity is 112,000 cubic meters which serves a
population of 522,000 inhibited in eastern part of Ahwaz city. The project
applies the advanced technology of Sequencing Batch Reactor (SBR).
- Primary treatment unit: This unit is comprised of
screening as well as girt & grease removal basin which separates coarse
particles (e.g. sticks, plastic materials, stone, etc.) as well as fine
components (grease, gravel and sand) to stem the processes that might damage
treatment equipment. The maximum daily treatment capacity of the plant is
190,800 cubic meters.
- Biological treatment: This part of treatment is done in
the SBR tank.
- Final treatment: This unit is design to disinfect the
water before being emptied into the stream. The disinfection process is done
by UV machine.
- Sludge unit: This section consists of sludge holding
tank, floating pump station, sludge thickener unit, disinfection & filtering
basin and sludge dewatering area. The processed sludge is used in
agriculture and etc. This is the first time in the country that an urban
wastewater treatment plant is built with such dimensions using SBR
- Earth work: 420,328 m3
- Total concrete: 40,000 m3
- Reinforcement: 3,000 t
- Formwork: 70,000 m2
- Metal work: 1,200 t