Abstract
Ammonia nitrogen (NH3-N) and chemical oxygen demand (COD) are two major pollutants in the first-effect distillate obtained from shale gas produced water after multiple-effect evaporation (MEE) treatment. Accordingly, an integrated adsorption–photocatalysis system with 4A zeolite was applied for the simultaneous removal of NH3-N and COD from the shale gas first-effect distillate. Effects of temperature, light source, reaction time, light intensity, and solution pH of the integrated system were discussed and optimized for pollutants removal. After 60-min illumination (PL-XQ500W xenon lamp, AM1.5, 25 A), NH3-N and COD removal rates were up to 88.9% and 59.0%, respectively. GC-MS analysis showed that long-chain organics in the shale gas distillate were oxidized and decomposed into short-chain organics mainly because of the effect of photocatalysis. The removal of NH3-N was the synergistic effect of zeolite adsorption and photocatalysis based on nitrogen component analysis in water samples.
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