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In chlorine dioxide (ClO2) generators, sodium chlorate is chemically converted to chlorine dioxide and sodium sulfate in a strong solution of sulfuric acid. The acid is purged from the generator continuously in order to prevent the accumulation of sodium sulfate. Separation of ClO2 generator's waste streams allows for the recycling of the sulfuric acid. Without splitting the streams, the effluent has a very high acid content which consumes alkalinity in the Kraft liquor. In order to counter the acid level, large quantities of caustic soda is consumed. The Eco-Tec GAP™ system is designed to separate the sulfuric acid from the sodium sulfate. It employs the use of the Eco-Tec APU® system. The resin used in the APU® system absorbs the acid while allowing the salt solution to pass through.
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