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Optimizing Municipal Wastewater for Regional Irrigation

This study explores a model for determining the need for government subsidies in wastewater recycling. The model is applied to a small town in Israel, considering factors such as water quantity, health regulations, farmer willingness to use recycled water, and treatment costs. The results indicate that cooperation between the town, farms, and government is necessary, with a minimum subsidy of 15% required for feasible recycled water prices.

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Optimizing Municipal Wastewater for Regional Irrigation

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  1. Treatment Optimization of Municipal Wastewater and Reuse for Regional IrrigationAriel Dinar & Dan Yaron Karen DuBose February 2, 2009 Water Resources Research, Vol 22, No. 3, pp. 331-338, March 1986

  2. Objective: • Create a model to determine whether a region needs government subsidies in order for wastewater recycling to occur • Apply the model to a small town in Israel

  3. Methods • Maximize region’s income subject to: • Quantity of recycled water produced • Health regulations • Ability/desire of farms to use recycled water • Price of treatment and irrigation technology

  4. Factors to account for • Town and treatment plant: • Cost of different levels of treatment • Storage capacity during fall/winter • Distance to users • Farmers: • Type of crop • Quantity of acreage available • Technology used by farmers • Cropping patterns • Quantity & price of water currently used

  5. Results • Cooperation is required between the town and some or all of the farms in order to produce recycled water • Government subsidy of at least 15% of the cost of the project is required, otherwise the price of recycled water will be too high for farmers • Intensity of water use increases with increasing subsidy

  6. Results Monetary values are constant 1980 dollars.

  7. Policy implications • Wastewater recycling projects are feasible, but both towns, recycled water users (farmers) and the government must share in the cost • An economic model can be used to help determine feasibility and cost of water reuse in a community

  8. Caveats • Wastewater recycling is a regional decision.

  9. Caveats • Wastewater recycling is a regional decision. • Public acceptance is the most critical factor of any water reuse scheme!

  10. Questions?

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