Project Final Report-07123-05-This project seeks to demonstrate a cost-effective process for produced water purification at the wellhead using a low-temperature distillation unit. The researchers will construct a demonstration unit that can utilize solar energy and coproduced geothermal energy for wellhead produced water desalination and will conduct a pilot test at two wellhead locations for a period of one year. Technical feasibility and economic efficiency of the proposed process will be evaluated by testing the energy consumption, maintenance cost, and durability.