Wastewater treatment efficiency in stabilization ponds, Olang treatment plant, Mashhad, 2011-13

Hadi Rahmatiyar, Elham Rahmanpour Salmani, Mohammad Reza Alipour, Hossein Alidadi, Roya peiravi


Olang wastewater treatment facilities purifying raw urban wastewater consist of two stabilization pond modules. Both are on operation in parallel. Functioning of natural systems is influenced by different factors including ambient condition. Considering final effluent of this system discharges to Kashafrood river and sometimes is used for agricultural purposes, assessing the quality parameters in effluent was the main objective of this study. This cross-sectional study investigated some important quality parameters for both raw and treated wastewater in two years periods. Data analysis was carried out using descriptive statistics. Statistical tests were done at a significant level of 0.05. Simple linear regression analysis was used only for modeling. Raw wastewater was almost severe.
Average removal efficiency for BOD5, COD, and TSS was 81, 83, and 78% respectively. There wasn’t a meaningful relationship between the removal efficiency of mentioned parameters and input pH. Ambient temperature fluctuations were effective on BOD5, and COD reduction. SAR index didn’t show a considerable restriction on irrigation application of effluent. In 62.5% cases outlet Na content was at the extent to which restrictions were imposed.
Olang wastewater treatment plant generates an acceptable effluent relating to most of the quality parameters that were measured in this study. Considering special status of Mashhad city, it is worthy to reuse effluent in areas with a high water requirement such as agriculture.


Irrigation, Natural Treatment, Performance,Seasonal Variations, Stabilization Pond

Full Text:



Ehrampoush M, Hosseinshahi D, Ebrahimi A, Ghaneian M, Lotfi M, Ghelmani S, et al. Evaluation of the Efficiency of Sub-Surface Constructed Wetland Methods in Wastewater Treatment in Yazd City in 2011. Tolooebehdasht. 2013;12(1):33-43 [Persian].

Ensink JH, Mukhtar M, van der Hoek W, Konradsen F. Simple intervention to reduce mosquito breeding in waste stabilisation ponds. Transactions of the Royal Society of Tropical Medicine and Hygiene. 2007;101(11):1143-46.

Al-Hashimi MAI, Hussain HT. Stabilization pond for wastewater treatment. J Euro Sci. 2013;9(14): 278-94.

Mburu N, Tebitendwa SM, van Bruggen JJA, Rousseau DPL, Lens PNL. Performance comparison and economics analysis of waste stabilization ponds and horizontal subsurface flow constructed wetlands treating domestic wastewater: A case study of the Juja sewage treatment works. J of Environmental Management. 2013;128:220-25.

Yi Q, Kim Y, Tateda M. Evaluation of nitrogen reduction in water hyacinth ponds integrated with waste stabilization ponds. J Desalination. 2009;249(2):528-34.

Kaya D, Dilek FB, Gökçay CF. Reuse of lagoon effluents in agriculture by post-treatment in a step feed dual treatment process. J Desalination. 2007;215(1–3):29-36.

Symonds EM, Verbyla ME, Lukasik JO, Kafle RC, Breitbart M, Mihelcic JR. A case study of enteric virus removal and insights into the associated risk of water reuse for two wastewater treatment pond systems in Bolivia. J Water Research. 2014;65:257-70.

Reinoso R, Torres LA, Bécares E. Efficiency of natural systems for removal of bacteria and pathogenic parasites from wastewater. J Sci of The Total Environment. 2008;395(2–3):80-6.

Almasi A, Dargahi A, Pirsaheb M. The Effect of Different Concentrations of Phenol on Anaerobic Stabilization Pond Performance in Treating Petroleum Refinery Wastewater. J Water and Wastewater. 2013;24(85):61-8[Persian].

Toumi A, Nejmeddine A, El Hamouri B. Heavy metal removal in waste stabilisation ponds and high rate ponds. J Water Science & Technology. 2000;42(10):17-21.

Gray N. Biology of wastewater treatment. 2th ed. Imperial College Press, London; 2004.

Short MD, Cromar NJ, Fallowfield HJ. Hydrodynamic performance of pilot-scale duckweed, algal-based, rock filter and attached-growth media reactors used for waste stabilisation pond research. J Ecological Engineering. 2010;36(12):1700-708.

Del Nery V, Damianovic MHZ, Pozzi E, de Nardi IR, Caldas VEA, Pires EC. Long-term performance and operational strategies of a poultry slaughterhouse waste stabilization pond system in a tropical climate. J Resources, Conservation and Recycling. 2013;71:7-14.

Tadesse I, Green FB, Puhakka JA. Seasonal and diurnal variations of temperature, pH and dissolved oxygen in advanced integrated wastewater pond system® treating tannery effluent. J Water Research. 2004;38(3):645-54.

Pirsaheb M, Sharafi K, Dogaohar K. Comparison of Mashhad olang wastewater treatment plant effluent with wells water quality for irrigation. J Water and Wastewater. 2013;23(84):116-21 [Persian].

Almasi A, Pirsaheb M, Dargahi A. The efficiency of anaerobic wastewater stabilization pond in removing phenol from Kermanshah Oil Refinery Wastewater. Iranian Journal of Health and Environment. 2012;5(1):41-50 [Persian].

Muga HE, Mihelcic JR, Reents NW, Morales S, Gemio G, Ballard M, et al. Treatment Performance of Wastewater Lagoons in South Yungas Province of Bolivia. Procedings of the World Environmental and Water Resource Congress; May; ASCE Kansas City, MO 2009.

Bojcevska H, Tonderski K. Impact of loads, season, and plant species on the performance of a tropical constructed wetland polishing effluent from sugar factory stabilization ponds. J Ecological Engineering. 2007;29(1):66-76.

Mazhab S, Falahzade M, Ghaneeian M, Rahmani SJ. Effects of Organic Load, pH, and EC Variations of Raw Wastewater and Weather Condition on the Efficiency of Yazd Stabilization Ponds. J Water and Wastewater. 2009;20(70):55-61[Persian].

Farzadkia M. Application of High Rate Stabilization Ponds for Treatment of Kermanshah City Slaughterhouse. J Water and Wastewater. 2004;15(51):10-5[Persian].

Iranian Journal of Health, Safety and Environment e-ISSN: :2345-5535 Iran university of Medical sciences, Tehran, Iran