Water Consumption Reduction by Application of Treated Hygienic Sewage of Yazd Combined Fuel Power Plant to Irrigate the Green Space, Iran

Abstract:

Recently, attention has been given to water shortage in Iran; especially in areas such as the province of Yazd, which has arid and semi-arid climate and is located in the central plateaus of Iran. In these situations, re-using sewage is one of the ways we can overcome the problem of water shortage. In order to combat the issue of water shortage and protect the environment, the Yazd combined cycle power plant has applied the effluent of the hygienic sewage treatment system (the active sludge system with extended aeration modification) for irrigation, which is the aim of this study. Studies show that every worker of this power plant uses 85 liter of water and produces 30 liter of hygienic sewage in every work shift. According to experiments that have been carried out on samples of raw sewage, pH, BOD₅, COD and TSS were found in 6.9 , 306.45mg/l, 595.85mg/l, 376.35mg/l, respectively. The amounts of the same parameters were 7, 65.80mg/l, 139.1mg/l, 34mg/l in the samples exiting treatment system, which are in accordance with Iran Department of Environment standards and with the irrigation criteria either. The system efficiency in eliminating some parameters is as follows, 76 % COD, 78% BOD₅ and 90 % of TSS. The most important effluent parameters in respect to irrigation water standards are SAR, Cl¯ and EC that have been measured in 6.15meq/l, 10meq/l and 1.882 µ mohs/cm, respectively. Based on comparisons between these amounts and the Wilcox diagram, the treated sewage is categorized as medium according to the quality of water used for irrigation. So it has been used to irrigate the green space within the ambit of the Yazd combined cycle power plant.

• Periodical: Applied Mechanics and Materials (Volumes 110-116)
• Pages: 2038-2042
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.110-116.2038
• Online since: October 2011
• Authors: Roya Nezakati, Nadiya Dehghan, Farshad Fasihi Majd, Mahindokht Dehdashtian
• Keywords: Hygienic Sewage, Iran, Irrigation, Re-Use, Treatment System, Yazd Combined Cycle Power Plant

References

[1] Henmi M, Fusaoka Y, Tomioka H, Kurihara M: High Performance RO Membranes for Desalination and Wastewater Reclamation and Their Operation Results, Water Convention Abstracts, Singapore, 48, (2009).

DOI: 10.2166/wpt.2009.068

[2] Congjie G: Development and Extension of Seawater Desalination by Reverse Osmosis, Chinese Journal of Oceanology and Limnology, 21, l: 40-45, (2003).

DOI: 10.1007/bf02842760

[3] Drioli E, Macedonio F, A: Process Intensification Strategy in Desalination and Wastewater Treatment by Membrane Operations, 6th IWA Leeading-Edge Conference on water and wastewater Technologies, Singapore, (2009).

[4] M. Asadi, Treatment of industrial sewages, University of Tehran, The first edition, pp.86-125, (1989).

[5] Iran Statistics Center, Yazd Province statistics report, (2006).

[6] www. Google. com.

[7] APHA, AWWA, WPCF: Standard Methods for Examination of Water and Wastewater, 21th edition., Washington, D.C. (2005).

[8] M. Chaeebakhsh, Assessment and application of industrial sewages of Shahid Rajaee powerplant for the green space irrigation", The 6th conference on the Quality and Efficiency in electricity industry.