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Simultaneous oxidative degradation of toxic acid wastewater from production of nitrocellulose and release of Mn 2+ from low‐grade MnO 2 ore as oxidant
Author(s) -
Zhang Yongtao,
Cai Jinhui,
Dan Zhigang,
Tian Yang,
Duan Ning,
Xin Baoping
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5159
Subject(s) - chemistry , nitrocellulose , manganese , dissolution , wastewater , extraction (chemistry) , effluent , degradation (telecommunications) , nuclear chemistry , chromatography , organic chemistry , waste management , telecommunications , biochemistry , membrane , computer science , engineering
BACKGROUND The development of a low cost and simple treatment process is necessary for toxic organic effluents. This work investigated the feasibility of the oxidative degradation of toxic nitrocellulose acid wastewater ( NAW ) using low‐grade MnO 2 ore as a cheap oxidant and the simultaneous release of Mn 2+ for preparation of electrolytic manganese metal ( EMM ). RESULTS Under optimal conditions of 100 g L −1 MnO 2 ore, 200‐mesh ore particles, concentrated H 2 SO 4 to NAW ratio of 0.12:1, contact time 120 min, stirring speed 160 rpm and temperature 90 °C, the total organic carbon ( TOC ) removal of the NAW and Mn release efficiency reached 98% and 97%, respectively. The TOC removal was significantly correlated with the release of Mn. The inert layer model best described the extraction behavior of Mn and apparent activation energy was 54.1 kJ mol −1 . Concomitant with TOC removal, the degradation of polysaccharide, phenol, protein and nitrocellulose occurred; meanwhile, the MnO 2 totally dissolved owing to reductive extraction of Mn. CONCLUSION A highly significant correlation occurred between TOC removal and Mn 2+ release, suggesting a reciprocal causation. The present process was competent to simultaneously realize oxidation degradation of NAW and reductive dissolution of Mn 2+ for EMM production, displaying a promising application prospect. © 2016 Society of Chemical Industry