White Paper: High-Efficiency Reverse Osmosis Treats Gray Water For Power Generation
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•White Paper: High-Efficiency Reverse Osmosis Treats Gray Water For Power Generation
BY Khaled Moftah, Aquatech International Corporation, Canonsburg, PA
Patrick Randall, Aquatech International Corporation, Tampa, FL
The Bajio Power Project, a 600 MW combined cycle project located in San Luis De La Paz, Mexico, had limited water resources in this arid area. Ground water is not permitted for industrial and power generation purposes. The only supply for boiler feed was a silica laden secondary treated sewage gray water. Because of limited supply and discharge restrictions a high- recovery reliable solution was required. The solution was a treatment plant designed, built and commissioned by Aquatech International Corporation to produce demineralized water for power plant use.
Process Selection
The design of any water treatment system is dependent on the feed water and product water characteristics. Secondary treated gray water has wide swings in quality, which must be considered for the success of any design. Characteristics of this water are shown in Table 1, and the boiler make- up water quality is shown in Table 2. A water treatment system is required based on these figures and with at least 75 – 80% recovery.
We see from Table 1 that the feed water has high levels of many difficult-to-treat contaminants. Typical values are: silica 85 ppm, BOD 30 ppm, COD 200 ppm, TSS 30, TDS 1300 ppm, and oil and grease 15 ppm. Effective treatment of gray water is not a new concept- but doing it effectively at high recovery with limited cleaning and downtime of the RO system in the presence of 85 ppm silica- until recently was believed to be unachievable. These high levels of contaminants may be expected for a gray water but what is the system which can treat it efficiently and economically to produce the boiler feed water?
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•White Paper: High-Efficiency Reverse Osmosis Treats Gray Water For Power Generation