hossien riahi - Department of Water Science Engineering, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran h.riahi@vru.ac.ir
Akram Seifi - ۱Department of Water Science & Engineering, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

In dry regions the reuse of treated wastewater plays a significant role in management, operation, scheduling and utilization of water resources. In design and operate of the sewage treatment plants , it is essential to measure and forecast the harvested water from wastewater plants and balance the groundwater depletion with these new resources. In this study, potential water harvested by local wastewater treatment plants, Rotating Biological Contactor (RBC) is determined and balanced with water requirement of plants. Based on the design basis of RBC, the production ratio of ۸۰ % is used and the produced discharge ranges from ۴ up to ۸ liter per seconds, with ۱۴۰۰۰۰ cubic meters per year. To quantify the balancing between RBC produced water and irrigation water requirements, a plant-by-plant water requirement is calculated and the operation rule of groundwater wells in the case study are determined and proposed as an action plan to the operator of wells.  Based on the results it was observed that the RBC can supply two times of pistachio orchard (۲۳ hectares) irrigation requirements or ۷۰ percent of the landscape and green space water needs in the case study.

irrigation requirement, Rotating Biological Contactor (RBC), wastewater reuse, water harvesting