Tuesday, November 6, 2007
208-7

Evaluating the Potential for Beneficial Uses of Blowdown Water.

Girisha Ganjegunte1, John Balliew2, Amy Eddins1, and Elias Montoya1. (1) Texas A&M University System, Texas Agricultural Experiment Station, 1380 A&M Circle, El Paso, TX 79927, (2) El Paso Water Utilities, 209 N Lee Street, El Paso, TX 79901

The water demands are increasing in the El Paso region, driven largely by rapid population and economic growth. At the Newman plant in northeast El Paso the blowdown water from the cooling process is being stored in a 45 acre pond. Blowdown water production is about three million gallons per day and it is being disposed of as land application and evaporation. The quality of the blowdown water is considered slightly saline (EC = 3.8 dS m-1 & TDS = 2440 mg L-1) and may be suitable for irrigating moderately sensitive crop (e.g. alfalfa) depending upon soil and site suitability. In particular the issue of potential soil salinization due to past and future blowdown water land application needs to be addressed to demonstrate the short-term and long-term feasibility of blowdown water irrigation. This project evaluates the soil and site suitability for the use of blowdown water for irrigation and using the greenhouse soil column study, changes in soil properties and crop responses are also being analyzed. In scarce areas such as El Paso, use of blowdown water to irrigate suitable crops may be a productive and efficient wastewater management option.