Water Economics and Politics Seminar Series
/ Water strategies in agriculture

Could recycled wastewater be indeed a global solution to water scarcity?

Speaker: Distinguished Prof. Emeritus Ariel Dinar | School of Public Policy, University of California, Riverside (UCR), United States

Moderator: Prof. Djiby Thiam | Director: WPE – Water and Production Economics, University of Cape Town (UCT), South Africa

Time: 16:00 South African Standard Time (SAST) | GMT +2

Topic: Water scarcity has been deteriorated in many parts of the world due to multiple causes, including population growth, lifestyle changes, increased demand for food and the impacts of climate change. Recent assessments suggest that the volume of wastewater locally and globally is increasing, providing larger volumes of wastewater appropriate for irrigation. Are more available wastewater resources the only condition for the relaxation of water scarcity globally? Additional considerations need to be included in the analysis of the role of treated wastewater in irrigated agriculture. The seminar will present work and discuss aspects related to difficulties in using treated wastewater for irrigated agriculture and how these difficulties may be addressed. Issues will include: the ability-to-pay for treated wastewater; a stable and acceptable allocation of treated wastewater among users; distribution among the polluters and the users of costs and benefits associated with the use of wastewater for irrigation; and creation of compensation mechanisms to attract potential users to remain part of the wastewater treatment and re-use ‘game’.

 Additional readings: Treatment optimization of municipal wastewater and reuse for regional irrigation. A. Dinar and D. Yaron in Water Resources Research, 22(3), 1986. | Sharing regional cooperative gains from reusing effluent for irrigation. A. Dinar, D. Yaron and Y. Kannai in Water Resources Research, 22(3), 1986. | Economic valuation of wastewater: The cost of action and the cost of no action. F. Hernández-Sancho, B. Lamizana-Diallo, J. Mateo-Sagasta and M. Qadir. United Nations Environment Programme, Nairobi, Kenya. 2014. | Economics of social trade-off: Balancing wastewater treatment cost and ecosystem damage. Y. Jiang, A. Dinar and P. Hellegers in Journal of Environmental Management, (211), 2018. | Overview of wastewater treatment challenges and solutions. (video) M. Qadir. Keynote speech at the Rosenberg International Forum on Water Policy and the Botin Foundation, Facing the Next Generation of Urban Wastewater Treatment, Madrid, Spain, January 29, 2025. | Local conditions and the economic feasibility of urban wastewater recycling in irrigated agriculture: Lessons from a stochastic regional analysis in California. A. Reznik and A. Dinar in Applied Economic Perspectives and Policy, 44(4), 2021. | Treated wastewater reuse: An efficient and sustainable solution for water resource scarcity. A. Reznik, A. Dinar, and F. Hernandez-Sancho in Environmental and Resource Economics, 74(4), 2019. | The impacts of climate change on wastewater treatment costs: Evidence from the wastewater sector in China. A. Reznik, Y. Jiang and A. Dinar in Water, 12(11), 2020

Ariel Dinar

About the speaker: Ariel Dinar is a Distinguished Professor of Environmental Economics and Policy, Emeritus at the School of Public Policy and a Professor of the Graduate Division at the University of California, Riverside (UCR), United States. His work has focused on various aspects of economic and strategic behaviour associated with management of natural resources and the environment. Dr Dinar received his PhD from the Hebrew University of Jerusalem. Since then he spent 15 years in the World Bank working on water and climate change economics and policy. In 2008, Dr Dinar assumed a professorship at UCR. Dr Dinar founded the Water Science and Policy Center, which he directed until 2014. Dr Dinar is an International Fellow of the Center for Agricultural Economic Research of the Hebrew University of Jerusalem, Israel since November 2010; a Fulbright Senior Specialist since 2003; and was named a 2015 Fellow of the Agricultural and Applied Economics Association. He authored and co-authored nearly 220 publications in peer reviewed journals, policy outlets and book chapters. He co-authored and edited 29 books and textbooks. He founded two technical journals (Strategic Behavior and the Environment, and Water Economics and Policy) for the latter one he serves at present as an Editor-in-Chief. He founded and serves as the Editor-in-Chief of the book series Global Issues in Water Policy. More: Ariel Dinar profile on University of California, Riverside.

Seminar format:

  • Live online session on Microsoft Teams
  • Duration: 1 hour
  • Live presentation with Q&A session

Who should attend: This series is open to students and faculty from academic institutions across South Africa and sub-Saharan Africa, policymakers, engineering and technical professionals, advocacy groups, NGO staff, and anyone with a keen interest in water economics and policy.

The UCT-UCR Seminar Series

This seminar is part of the UCT-UCR Seminar Series: Water Economics and Politics, a collaboration between the University of Cape Town (UCT) and University of California, Riverside (UCR). Subscribe to our mailing list to receive updates on upcoming sessions.

About the series