Cost Analysis and Health Risk Assessment of Wastewater Reuse from Secondary and Tertiary Wastewater Treatment Plants

Sara AbdelMoula, Mohamed T. Sorour and Samia A. Abdelrahman Aly
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Sara AbdelMoula: Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
Mohamed T. Sorour: Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
Samia A. Abdelrahman Aly: Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt

Sustainability, 2021, vol. 13, issue 23, 1-17

Abstract: Irrigation with reclaimed water is a widespread solution to coping with water scarcity, especially in the Middle East and North Africa (MENA) region. This paper presents a systematic evaluation approach of six treatment alternatives proposed for Alexandria WWTP in Egypt as an applied example. This approach evaluates the effluent quality and cubic meter price from the proposed treatment alternatives while managing the health risks associated with reclaimed water irrigation. Rotavirus, Salmonella, Giardia duodenalis, and Ascaris were studied as waterborne pathogens. A quantitative microbial risk assessment model was used for the estimation of annual infection risks. The exposure scenarios include farmers and vegetable consumers. Activated sludge provided the lowest costs; however, it gave the lowest efficiencies and highest health risks. On the other hand, the highest efficiency and lowest health risks were obtained by the membrane bioreactor. The resulting price of a cubic meter of treated wastewater, used in irrigation, ranged from 0.082 to 0.133 USD. Irrigation using tertiary-treated wastewater achieved the target infection risk for unrestricted irrigation without using advanced treatment facilities. The results of this study could give a comprehensive view of reusing wastewater to decision-makers to address both water and food poverty not only in Egypt but also in other countries in MENA with similar economic and agro-ecological conditions.

Keywords: wastewater reuse; quantitative microbial risk assessment (QMRA); cost analysis; modeling and simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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