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Effect of hot chlorine dioxide delignification on AOX in bagasse pulp wastewater

Zhang, Haichuan, Nie, Shuangxi, Qin, Chengrong, Zhang, Kun, Wang, Shuangfei
Cellulose 2018 v.25 no.3 pp. 2037-2049
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, bagasse, cellulose, chlorine dioxide, delignification, gas chromatography-mass spectrometry, hydrocarbons, industrial applications, lignin, pulp, temperature, wastewater
This work describes the effect of the hot chlorine dioxide delignification (DHT) on the properties of bagasse fiber and the formation of AOX. The bagasse pulp was subjected to both DHT and normal temperature chlorine dioxide delignification (D₀), and the AOX contents in the effluent were determined respectively. The GC–MS results showed that the main components of the D₀ stage wastewater were chlorinated hydrocarbons and chlorinated diphenyls. In contrast, those AOXs in the DHT stage wastewater were very few. The GC–MS, ATR-FTIR, and XPS results showed the DHT process is more effective in the removal of the residual phenolic lignin and the hemicellulose-linked HexA compared with D₀. Furthermore, in comparison, the AOX content could be reduced by 50% with DHT. The fully bleached pulp obtained via DHTEₚD process has a higher brightness than that obtained by D₀EₚD, which provides a reliable theoretical basis for industrial application.