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To remove the toxic and refractory pollutants in the phthalonitrile resin wastewater and improve its biodegradability, a combined process (i.e., CaCl2+AA+Fe/Cu/air) was developed to pretreat this wastewater obtained from a phthalonitrile resin manufacturing plant in southwestern China. First, CO32− was precipitated and removed by adding CaCl2. Furthermore, its ultra-high concentrated NO2− (22.7±0...
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