RESOURCES CONSERVATION AND RECYCLING, cilt.94, ss.146-156, 2015 (SCI İndekslerine Giren Dergi)
Agricultural use of sludge is a beneficial alternative for sludge handling and recycling which may improve soil fertility through providing organic matter and nutrients. This study focuses on sludge application scheduling for suitable arable lands. Ankara (Turkey) was the study site. A screening procedure and buffer zone application were conducted to eliminate the arable lands not suitable for sludge application, ArcGIS was used for spatial analysis. Then a transport cost-based optimization model was employed to determine the lands that would be receiving sludge in a management period of 2013 to 2022. The spatial analysis by ArcGIS indicated that 75% of the total non-irrigated arable lands in Ankara were not appropriate for sludge application. Optimization results showed that only 17% of the suitable lands could receive sludge application for the conditions considered in this study. Average costs for sludge transportation in the management period were $84,855/year, $77,299/year, and $62,349/year for truck capacities of 10, 16 and 24 t, respectively. Total sludge transportation costs decreased for higher truck capacities. Sensitivity analysis indicated that transportation costs and the area of suitable lands receiving sludge were sensitive to sludge application dosage, application frequency, travel distance, and unit fuel cost escalation. (C) 2014 Elsevier B.V. All rights reserved.