Dairy Wastewater Treatment Plant in Removal of Organic Pollution: A Case Study in Sanandaj, Iran

Environmental Health Engineering and Management Journal 2015; 2(2): 73–77

5 Pages Posted: 21 Sep 2015

See all articles by Nammam Ali Azadi

Nammam Ali Azadi

Kurdistan Research Center for Social Determinants of Health, Medical School, Kurdistan University of Medical Sciences, Sanandaj, Iran

Reza Ali Fallahzadeh

Department of Environmental Health Engineering, School of Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

Shahram Sadeghi

Environmental Health Engineering, Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran

Date Written: June 21, 2015

Abstract

Background: Wastewater produced by a dairy in Sanandaj is a major source of environmental pollution threatening the city. The dairy uses activated sludge treatment to remove organic pollution from the wastewater. The present study evaluated the performance of this process and its compliance with national requirements for chemical oxygen demand (COD), biochemical oxygen demand (BOD), and total suspended solids (TSS) remaining in the plant effluent.

Methods: A total of 48 samples were obtained from the dairy inflow and outflow. The COD, BOD, and TSS were measured for each sample. The statistical sign test was used to assess the standards.

Results: The results showed that the average BOD, COD and TSS in the input wastewater was 292.25, 422.92, and 198.33 mg/l, respectively. The ratio of BOD/COD was 0.69, which indicates the capacity of biological treatment was high. The BOD decreased to 64.22 mg/l (92% removal), COD to 33.74 mg/l (92% removal), and TSS to 43.11 mg/l (94% removal) in the effluent, indicating significant removal of water contaminants. The statistical sign test showed that TSS (P < 0.0001) and BOD (P=0.031) were incompliance with national standards, but COD exceeded standard threshold (P=0.076).

Conclusion: Activated sludge treatment showed a good performance for TSS removal, but was not reliable for removal of BOD and COD pollutants.

Keywords: Activated sludge system, Dairy wastewater, Sanandaj, Wastewater treatment, BOD, COD, TSS

Suggested Citation

Azadi, Nammam Ali and Fallahzadeh, Reza Ali and Sadeghi, Shahram, Dairy Wastewater Treatment Plant in Removal of Organic Pollution: A Case Study in Sanandaj, Iran (June 21, 2015). Environmental Health Engineering and Management Journal 2015; 2(2): 73–77, Available at SSRN: https://ssrn.com/abstract=2662793

Nammam Ali Azadi

Kurdistan Research Center for Social Determinants of Health, Medical School, Kurdistan University of Medical Sciences, Sanandaj, Iran ( email )

Sanandaj
Iran

Reza Ali Fallahzadeh

Department of Environmental Health Engineering, School of Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran ( email )

Shohaday-e-Gomnam Blvd.
Alem Sq.
Yazd
Iran

Shahram Sadeghi (Contact Author)

Environmental Health Engineering, Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran ( email )

Sanandaj
Iran

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