Selda MURAT HOCAOGLU, İpek ERZİ, Seyla ERGENEKON

Merkezi ve Yerinde Atıksu Geri Kazanımının Karşılaştırılması: Bir Turizm Bölgesi için Örnek Çalışma

Bu çalışmada, merkezi ve yerinde atıksu geri kazanım alternatiflerinin, su tasarruf potansiyeli ve maliyeti, Antalya’daki bir turizm bölgesi için karşılaştırılmıştır. Yerinde atıksu geri kazanımı uygulamasında, geri kazanılabilecek su miktarının, oluşan atıksu miktarı ve otelin sulama yapılan yeşil alan büyüklüğünün, yatak sayısına oranı ile ilgili olduğu belirlenmiştir. Ġncelenen turizm bölgesi için, kırılma noktasının 50 m2 /yatak olduğu tahmin edilmiştir. Bu doğrultuda, sulanan yeşil alan büyüklüğünün yatak sayısına oranının, bu değerin altında olduğu otellerde, yerinde atıksu geri kazanımı ekonomik olmayabilir. Merkezi atıksu geri kazanım uygulanması durumunda ise, atıksu kaynağı ve ihtiyaç arasında denge sağlanabilecek, incelenen turizm bölgesi için yerinde arıtmaya kıyasla %60 daha fazla su geri kazanılabilecektir. Merkezi atıksu geri kazanımının ilk yatırım ve işletme maliyetleri de yerinde arıtmaya kıyasla oldukça düşük bulunmuş ve geri kazanılacak suyun maliyetinin, şebeke suyunun altında olacağı tahmin edilmiştir. Yerinde geri kazanım için, sulama suyu olarak kullanılabilecek arıtılmış suyun, ortalama birim fiyatı 1,29 €/m3 olarak hesaplanmış, buna karşın, merkezi atıksu geri kazanımında, arıtılmış suyun 0,35 €/m3 bedel ile otellere satılması durumunda, % 20 iç verim oranı ve 5 yıllık geri ödeme süresinin sağlanabileceği belirlenmiştir.

CENTRALIZED VERSUS DECENTRALIZED WASTEWATER REUSE: A CASE STUDY FOR A TOURISTIC AREA

In this study, centralized and decentralized wastewater reuse alternatives were compared interms of water saving potential and costs for a touristic case study area in Antalya, Turkey. The results ofdecentralized reuse revealed that the maximum water saving of a hotel is limited with either amount ofwastewater generated or ratio of irrigated landscape area to bed number. The breakpoint for the case studyarea is estimated as 50 m2/bed. As a result, in hotels where the ratio of irrigated area is less than 50m2/bed, wastewater reuse may not be cost effective. In case of centralized wastewater reuse, supply anddemand is balanced and as a result 60% more water saving may be achieved for the case study area.Furthermore, investment and operation cost of centralized reuse are considerably low and the price ofreclaimed water is lower than price of service water. The average unit price of reclaimed water used asirrigation water was found to be 1.29 €/m3in decentralized reuse, while the unit price was found to be0.35 €/m3in centralized reuse; which brings forth an internal rate of return by 20% and a 5-year paybackperiod.

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Asano, T. (2005). Urban water recycling, Water Science and Technology, 51 (8), 83-89.
Bohdanowicz, P., Ivo, M. (2007). Determinants and benchmarking of resource consumption in hotels—Case study of Hilton International and Scandic in Europe, Energy and Buildings, 39 (1), 82-95. doi:10.1016/j.enbuild.2006.05.005
Chen R., Wang X.C. (2009). Cost–benefit evaluation of a decentralized water system for wastewater reuse and environmental protection, Water Science and Technology, 59 (8), 1515-1522. doi: 10.2166/wst.2009.156
Tortella, B.D., Dolores, T. (2011). Hotel water consumption at a seasonal mass tourist destination. The case of The Island of Mallorca, Journal of Environmental Management, 92 (10), 2568-2579. doi:10.1016/j.jenvman.2011.05.024
Gonzales, P., Ajami, N.K. (2017). An integrative regional resilience framework for the changing urban water paradigm, Sustainable Cities and Society, 30, 128–138. doi:10.1016/j.scs.2017.01.012
Hocaoglu S.M. (2017). Evaluations of on-site wastewater reuse alternatives for hotels through water balance, Resources, Conservation and Recycling, 122, 43-50. doi:10.1016/j.resconrec.2017.01.022
Hong, S.W., Choi, Y.S., Kim, S.J., Kwon, G. (2005). Pilot-testing an alternative on-site wastewater treatment system for small communities and its automatic control. Water Sci. Technol. 51, 101-108. doi:10.2166/wst.2005.0356
Joustra, C., Yeh, D. (2014). Demand and source-driven prioritization framework towards integrated building water management (IBWM). Sustainable Cities and Society, 14, 114- 125. doi:10.1016/j.scs.2014.08.009
Chu, J., Chen, J., Wang, C., Fu, P. (2004). Wastewater reuse potential analysis: implications for China's water resources management, Water Research, 38 (11), 2746-2756. doi: 10.1016/j.watres.2004.04.002
. Kujawa-Roeleveld, K., Zeeman, G. (2006). Anaerobic treatment in decentralised and source-separation-based sanitation concepts, Rev. Environ. Sci. Biotechnol. 5, 115-139. doi:10.1007/s11157-005-5789-9
Lamichhane, K.M. (2007). On-site sanitation: A viable alternative to modern wastewater treatment plants, Water Sci. Technol. 55, 433-440. doi:10.2166/wst.2007.044
Larsen, T.A., Alder, A.C., Eggen, R.I.L., Maurer, M., Lienert, J. (2009), Source separation: Will we see a paradigm shift in wastewater handling?, Water Sci. Technol. 43, 6121-6125. doi:10.1021/es803001r
Larsen, T.A., Maurer, M. (2011). Source separation and decentralization. In:Wilderer, Peter (Ed.), Treatise on Water Science. Elsevier, Oxford, 203-229. doi:10.1016/B978-0-444- 53199-5.00083-X
Libralato, G., Ghirardini, A.V., Avezzù, F. (2012). To centralise or to decentralise: An overview of the most recent trends in wastewater treatment management, Journal Of Environmental Management, 94, 61-68. doi:10.1016/j.jenvman.2011.07.010
Onucyildiz, M., Sevimli, M.F., Gorgulu, G. (2008). Evaluation of decentralized and centralized wastewater treatment plants, 8th International Scientific Conference on Modern Management of Mine Producing, Geology and Environmental Protection, SGEM, 1, 651- 658.
Otterpohl, R., Braun, U., Oldenburg, M. (2003). Innovative technologies for decentralized wastewater management in urban and peri-urban areas, Water Sci. Technol. 48, 23-32.
Roefs, I., Meulman, B., Vreeburg, J. H. G., Spiller, M. (2017). Centralised, decentralised or hybrid sanitation systems? Economic evaluation under urban development uncertainty and phased expansion, Water Research, 109, 274-286. doi:10.1016/j.watres.2016.11.051
Singh, N.K., Kazmi, A.A., Starkl, M. A. (2015). Review on full-scale decentralized wastewater treatment systems: Techno-economical approach, Water Science and Technology, 71 (4), 468-478. doi: 10.2166/wst.2014.413.
Tchobanoglous, G., Ruppe, L., Leverenz, H., Darby, J. (2004). Decentralized wastewater management: challenges and opportunities for the twenty-first century, Water Sci. Technol 4, 95-102. doi.10.2166/ws.2004.0011
Wang, X.C., Chen, R., Zhang, Q.H., Li, K. (2008). Optimized plan of centralized and decentralized wastewater reuse systems for housing development in the urban area of Xi’an, China, Water Science and Technology 58 (5), 969-975. doi: 10.2166/wst.2008.456.
Werner, C. (2004). Ecological sanitation–principles, urban application and Challenges, Report at UN Commission on Sustainable Development, 12th Session - New York, 14-30 April, USA.
Woods, G.J., Kang, D., Quintanar, D.R., Curley, E.F., Davis, S.E., Lansey, K.E., Arnold, R.G. (2013). Centralized versus decentralized wastewater reclamation in the Houghton area of Tucson, Arizona, Journal of Water Resources Planning and Management, 139 (3), 313- 324. doi: 10.1061/(ASCE)WR.1943-5452.0000249