The project goal was to develop and fabricate a bentonite clay membrane (cheap and readily available) and a precipitator unit with either tubular ceramic or clay membranes to provide a water treatment system that would process produced water into reusable water, reducing current disposal costs by as much as 90%.
This project was selected in response to DOE's Oil Exploration and Production solicitation DE-PS26-01NT41048, focus area Effective Environmental Protection. The goal of the program was to reduce compliance costs and improve environmental performance by providing lower-cost technologies, and/or provide sound scientific basis for cost-effective, risk-based regulatory decisions.
New Mexico Institute of Mining and Technology
Disposal of large amounts of produced water is expensive for the oil and gas industry and potentially dangerous to the environment. RO has been shown in some studies to be potentially feasible for decontamination of produced waters, but costs would be prohibitive and existing technology inadequate. Researchers proposed to develop an inexpensive RO membrane that needs little or no pretreatment, which would make RO desalination more cost-effective.
Researchers developed some promising synthetic clay membranes, although the original betonite membranes did not prove successful for salt rejection. The new membranes developed are being tested further for potential use in gas separation.
The development of a modified reverse osmosis (RO) system such as that proposed by the project would be a significant breakthrough in the field of water treatment by decreasing operating costs through the use of a cheap membrane such as the proposed bentonite clay membrane. Potential uses of the treated and purified water would be significant.
The project covered the following tasks:
The project is complete. A new project, Treating Coalbed Methane Produced Water for Beneficial Use by MFI Zeolite Membranes (DE-FC26-04NT15548), carries on the studies begun in this project. The new project will develop a new technology of reverse osmosis through molecular sieve zeolite membranes to efficiently treat for beneficial use coalbed natural gas produced water with high total dissolved solids. The project will include extensive fundamental investigation of the RO mechanisms on zeolite membranes. The understanding gained will be used to improve zeolite membranes, and finally, to subject these improved membranes to long-term (>1,500 hours) RO operation to study their stability and to collect experimental data for technical and economic evaluations of the new technology.
$285,642 (24% of total)
Lee, R., and Dong, J., Modified Reverse Osmosis System for Treatment of Produced Waters, final technical progress report, September 1, 2000-February 28, 2004, U.S. DOE, Contract No. DE-FC26-00BC15326, June 2004.
Li, L., Dong, J., and Lee, R., Preparation of ?-alumina-supported mesoporous bentonite mem-branes for reverse osmosis desalination of aqueous solutions, J. Colloid and Interface Sci., 273 (2004) 540-546.
Li, L., Dong, J., Nenoff, T., and Lee, R.: Reverse osmosis of ionic aqueous solutions on a MFI zeolite membrane, Desalination, Nov. 5, 2004, V. 170, No. 3, pp. 209-316.
Li, L., Dong, J., Nenoff, T., and Lee, R., Desalination by Reverse Osmosis Using MFI Zeolite Membranes, J. Membrane Sci., Nov. 1, 2004, V. 243, No.1-2, pp. 401-404.