Project sector: Wastewater treatment

Project status: Completed

Project location: Chahar-Mahal-Bakhtiari Province (southwest of Iran)

Project objective: Reusing of treated wastewater for agricultural usages on the basis of quantitative and qualitative analysis of treated wastewater

Project starting Date: September 2009

Project completion date: October 2014

Project duration: 5 years



The Cities of Chahar-Mahal-E-Bakhtiyari province is one of the first cities in Iran in the field of construction and operation of urban wastewater treatment plants. When we started this project not only were there wastewater treatment plants in the operation in 5 cities but also in other cities of Chahar-Mahal-Bakhtiyari treatment water planets were under the construction. When we visited the project’s location, we found that some of the local farmers were using wastewater effluent to irrigate their own lands.

The wastewater treatment plants in these cities are outdoor and the method was chosen for treating the wastewater is Extended Aeration Activated Sludge (EAAS). The available facilities in these wastewater treatment plants include a screening system, grit chamber, aeration tanks, sludge pumping station, Settling tanks, and chlorination system. The environmental impacts of using treated wastewater and return flow reuse had analyzed based on international standards and chemical analysis of them in comparison with the allowed amount of existing contaminants in the wastewater (BOD, COD, TSS, and pH).

Chahar Mahal 1

The treatment wastewater plant in Shahr-Kord Province


Project Outcomes

According to the chemical analysis of treated waste water’s ingredients, the amount of existing contaminates (BOD, COD, TSS, and PH) were less than the allowed one. Results showed that by considering the local cultivation pattern, using from treated wastewater for irrigation of farmlands hadn’t prohibited.

Also, our technical team had designed the wastewater transmission canal for Borujen County’s wastewater treatment plant, besides estimating the cost of constructing this canal. Moreover, the wastewater transmission canal of Borujen City’s wastewater treatment plant was designed for transferring the treated sewage to the cultivated area. Also, the total cost of construction of this wastewater transmission canal was estimated to determine the amount of investment of this project.

Chahar Mahal 2

The route of the wastewater transmission canal from the Borujen wastewater treatment plant

Chahar Mahal 3

Visiting the stilling basin of wastewater treatment plants of Shahr-E-Kord city

Chahar Mahal 4

Investigation of the water quality of irrigation canal grade 3