Performance evaluation of the wastewater treatment plant of Pelareh Dairy Industry, Iran

Document Type: Original Article


Department of Environment, School of Basic Knowledge, Islamic Azad University, Hamadan Branch, Hamadan, Iran


Pelareh Dairy Industry (PDI) is located in the west of Iran. The aim of the present study was to assess the quality and quantity of PDI wastewater and compare the results with the regulations. PDI has a wastewater treatment plant that consists of sewage collection system, screening system, equalization tank, clarification tank, anaerobic system for pretreatment, activated sludge processing, disinfection, and solids drying beds. In this research, seven quality parameters, including chemical oxygen demand (COD), five-day biochemical oxygen demand (BOD5), nitrate (NO3), total suspended solids (TSS), phosphate (PO4), temperature (Tºc), and pH, were measured as qualitative variables. Thus, 20 samples were collected from influent and effluent zones. Wastewater samples were collected using random grab sampling during peak hours. Based on the results, the average (SD) COD concentration of the raw wastewater in wet season and dry season was 2152.22 (1384.00) and 1813.38 (518.33) mg/l, respectively. The results revealed that the removal efficiency of BOD5, COD, and TSS at the studied plant was 89.22%, 88.79%, and 71.72%, respectively. Based on achieved results, the pollution load of PDI effluent wastewater was determined and presented. Based on the obtained results, the pollution load based on BOD5 variable was 15.71 kg/day. The obtained results indicate that the treatment plant was not efficient enough to be considered as a treatment process for the removal of suspended solids and organic matter. 


  1. Riyahi Khoram M, Safikhani M, Khezri SM. Review of Hosein Aabad Sugar Factory (HASF) wastewater and assessment of its pollution load. J Appl Sci Environ Manage 2013; 17(3): 395-400.
  2. Pallavi N, Mahesh S. Feasibility study of moringa oleifera as a natural coagulant for the treatment of dairy wastewater. International Journal of Engineering Research 2013; 2(3): 200-2.
  3. Kowalska E, Paturej E, Zielinska M. Use of Lecane rotifers for limiting Thiothrix filamentous bacteria in bulking activated sludge in a dairy wastewater treatment plant. Arch Biol Sci 2014; 66(4): 1371-8.
  4. Bazrafshan E, Moein H, Kord Mostafapour F, Nakhaie S. Application of electrocoagulation process for dairy wastewater treatment. J Chem 2013; 2013: 1-8.
  5. Pathak U, Das P, Banerjee P, Datta S. Treatment of wastewater from a dairy industry using rice husk as adsorbent: treatment efficiency, isotherm, thermodynamics, and kinetics modelling. Journal of Thermodynamics 2016; 2016: 1-7.
  6. Andrade LH, Mendes FDS, Espindola JC, Amaral MCS. Nanofiltration as tertiary treatment for the reuse of dairy wastewater treated by membrane bioreactor. Sep Purif Technol 2014; 126: 21-9.
  7. Mostafa AA. Treatment of cheese processing wastewater by physicochemical and biological methods. International Journal of Microbiological Research 2013; 4(3): 321-32.
  8. Ravva SV, Sarreal CZ. Survival of Salmonella enterica in aerated and nonaerated wastewaters from dairy lagoons. Int J Environ Res Public Health 2014; 11(11): 11249-60.
  9. Lamas Samanamud GR, Loures CC, Souza AL, Salazar RF, Oliveira IS, Silva MB, et al. Heterogeneous photocatalytic degradation of dairy wastewater using immobilized ZnO. ISRN Chemical Engineering 2012; 2012: 1-8.
  10. Shinkar NP. Comparative study of various treatments for dairy industry wastewater. IOSR Journal of Engineering 2013; 3(8): 42-7.
  11. Kyrychuk I, Zmievskii Y, Myronchuk V. Treatment of dairy effluent model solutions by nanofiltration and reverse osmosis. Ukrainian Food Journal 2015; 3(2): 280-7.
  12. Karthikeyan V, Venkatesh KR, Arutchelvan V. A correlation study on physico-chemical characteristics of dairy wastewater. Int J Eng Sci Techno 2015; 7(2): 89-92.
  13. Gulyas G, Fazekas B, Varga R, Karpati A. Biological purification of chemically pre-treated dairy wastewater before discharge into a municipal sewage systems. Hung J Ind Chem 2015; 43(1): 45-8.
  14. American Public Health Association. Standard methods for the examination of water and wastewater. Rochester, NY: Scholar's Choice; 2015.
  15. Guruvaiah M, Narra M, Shah E, James J, Kurchania A. Utilization of dairy wastewater for pollutants removal and high lipid biomass production by a newly isolated microalgal strains chloromonas playfairii and desmodesmus opoliensis. Int J Appl Sci Biotechnol 2015; 3(4): 699-707.
  16. BriaoI VB, Granhen Tavares CR. Scientific Note: Ultrafiltration of effluents from a dairy industry for nutrient recovery: Effect of pressure and tangential velocity. Braz J Food Technol 2012; 15(4): 176-83.
  17. Gorra R, Freppaz M, Zanini E, Scalenghe R. Mountain dairy wastewater treatment with the use of a ?irregularly shaped constructed wetland (Aosta Valley, Italy). Ecological Engineering 2014; 73: 176-83.
  18. Harush DP, Hampannavar US, Mallikarjunaswami ME. Treatment of dairy wastewater using aerobic biodegradation and coagulation. International Journal of Environmental Sciences and Research 2011; 1(1): 23-6.
  19. Konieczny P, Ekner E, Uchman W, Kufel B. Effective use of ferric sulfate in treatment of different food industry wastewater. Acta Sci Pol Technol Aliment 2005; 4(1): 123-32.
  20. Ghaly AE, Farag HA, Verma M. A hydroponic system for purification of anaerobically treated dairy manure and production of wheat as a nutritional forage crop. Am J Agric Biol Sci 2007; 2(3): 206-17.
  21. Schaafsma JA, Baldwin H, Streb CA. An evaluation of a constructed wetland to treat wastewater from a dairy farm in Maryland, USA. Ecol Eng 1999; 14(1?2): 199-206.
  22. Ghaly AE, Kamal M, Mahmoud NS. Phytoremediation of aquaculture wastewater for water recycling and production of fish feed. Environ Int 2005; 31(1): 1-13.
  23. Mantovi P, Piccinini S, Marmiroli M, Marmiroli N. Constructed wetlands are suitable to treat wastewater from Italian cheese productions. Water Practice & Technology 2011; 6(3): 1-9.
  24. Chaiudhari DH, Dhoble RM. Performance evaluation of effluent treatment plant of dairy industry. Current World Environment 2010; 5(2): 373-8.
  25. Pachpute A, Sanjivan Mahadik SK. Use of constructed wetland for treatment of dairy industry waste water. International Journal of Innovative Research in Science, Engineering and Technology 2014; 3(4): 197-200.
  26. Balamane-Zizi O, Ait-Amar H. Combined processes for phosphorus removal from a dairy plant wastewater: conditions influencing the chemical process. Environ Sci Technol 2009; 2(2): 112-9.
  27. Ebrahimi A, Asadi M, Najafpour GD. Dairy wastewater treatment using three-stage rotating biological contactor (NRBC). Int J Eng 2009; 22(2): 107-14.
  28. BriaoI VB, Tavares CR. Pore blocking mechanism for the recovery of milk solids from dairy wastewater by ultrafiltration. Braz J Chem Eng 2012; 29(2): 393-407.
  29. Ghezzehei TA, Sarkhot DV, Berhe AA. Biochar can be used to recapture essential nutrients from dairy wastewater. Solid Earth 2014; 6(6): 1101-25.
  30. Salame C, Aillerie M, Khoury G, Balamane-Zizi O, Ait-Amara H. Terragreen 2012: Clean energy solutions for sustainable environment (cesse)study of the simultaneous elimination of phosphates and heavy metals contained in dairy wastewater by a physical-chemical and biological mixed process; consequences on the biodegradability. Energy Procedia 2012; 18: 1341-60.
  31. Sadhana C, Raj K. Water quality and pollution load of river Mandakini at Chitrakoot, India. Int Res J Environment Sci 2013; 2(6): 13-9.
  32. Hosseini-Zare N, Gholami A, Panahpour E, Jafarnejadi A. Pollution load assessment in the soil and water resources: a case study in karun river drainage basin, southwest of Iran. European Online Journal of Natural and Social Sciences 2014; 3(3): 427-34.
  33. Oras K, Gruner E. The estimation of the wastewater generation and pollution load by the branches of industry. Proceeding of the International Work Session on Water Statistics; 2005 June 20-22; Vienna, Austria.
  34. Hafizul Islam M, Rahman M, Ashra FU. Assessment of water quality and impact of effluents from fertilizer factories to the Lakhya River. International Journal of Water Resources and Environmental Engineering 2010; 2(8): 208-21.