آب و فاضلاب (Nov 2019)
Economic Evaluation of the Use of Treated Wastewater and the Cost of Pollution Control for Irrigation of Green Spaces in the City of Zahedan
Abstract
The limited and vulnerable water resources in the world have a special economic value with social, economic and environmental impacts. Water resources constraints and the need for optimal use of these resources show the necessity and importance of using refined wastewater. In this research, the economic evaluation of the use of treated wastewater in Zahedan Green irrigation with economic and financial justification and focus on the environmental benefits of the wastewater treatment process are considered. Two scenarios are considered in this research: In the first case, according to the sales price of water equal to 3000 and 45000 Rials, an estimate has been made and in the second scenario, the environmental benefits and benefits of the project are estimated by estimating the shadow price of pollutants and pollutants from wastewater treatment. The data used in this study was based on spending patterns Water and Wastewater Company has been gathered Sistan and Baluchestan Province Zahedan is the location of the project. The findings of the study conducted in the first scenario show that the project is not justified in this scenario, the net value of the project over a period of 20 years and a 25 percent rate of return equal to -182.2065617 Rials as well as the benefit to cost ratio in this scenario is 0.68 times. In the second scenario examines reduce the environmental impact of wastewater treatment processes for the manufacture of shadow prices of undesirable and pollution control has been dealt with distance function. The average price shadow for adverse outcomes, including total biochemical oxygen demand, total chemical oxygen demand (BOD and COD) wastewater treatment ranged between 94-92 years, respectively -100.1, -319.75, -500.6 respectively. Shadow price to be interpreted that if we want the wastewater treatment plant and produce undesirable emissions (BOD and COD) reduce This will produce less than the desired output (treated water) or increased use of inputs in remediation and disposal of the product is desirable.
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