
Lextran's patented technology can utilize a variety of reagents in order to capture SOx and NOx. The use of ammonia as a reagent results in the production of ammonium sulfate, a whole-water commercial-grade fertilizer, purified by re-crystallization.
Containing nitrogen as ammonium cations and sulfur as sulfate anions, ammonium sulfate is used largely as a nitrogen fertilizer. In the soil, the ammonium is transformed by soil bacteria into nitrate anion form. It can be then absorbed into the soil cations exchange complex or taken-up directly as ammonium ions by growing plants.
Sulfate anions are usually combined with calcium cations in the soil, forming a slowly soluble source of calcium and sulfate ions needed in order to maintain soil structure and supply calcium and sulfate to the growing vegetation.
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Power generators, namely power plants, as well as other industrial installations burning coal and/or heavy fuels, are a significant source of three major polluting emissions: sulfur dioxide (SO2), nitrogen oxides (NOx), mercury (Hg) and other heavy metals.
Numerous technologies are currently used for reducing the emissions of these pollutants; however, most prevalent technologies effectively treat only one pollutant within a single process.
Lextran's patented technology is, therefore, unique, as it introduces a single-step, simultaneous multi-pollutant removal approach. Utilizing a single-step approach to reduce SO2, NOx and mercury is not only considerably less costly, but also far more effective than treating each pollutant separately.
In Lextran's process, all three key pollutants are simultaneously purged in a single wet scrubber, employing Lextran's patented organic catalyst, which upon dispersion in water acts as scrubbing media. The entire process is very simple, requiring minimum equipment and reagents, as well as a relatively small footprint. Additionally, the process yields a valuable, commercial-grade fertilizer as byproduct.
Lextran's technology either meets or substantially exceeds all international regulatory requirements for coal and heavy fuel fired power plants and other combustion plants, including:
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Almost complete removal of SO2
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Up to 60% removal of NOx
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Almost complete removal of mercury and other heavy metals
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Partial removal of particles
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