Integrated adsorptive technique for efficient recovery of m-cresol and m-toluidine from actual acidic and salty wastewater
DOI: 10.1016/j.jhazmat.2016.03.056
Title: Integrated adsorptive technique for efficient recovery of m-cresol and m-toluidine from actual acidic and salty wastewater
Journal Title: Journal of Hazardous Materials
Volume: 312
Publication Date: 15 July 2016
Start Page: 192
End Page: 199
Published online: online 22 March 2016
ISSN: 0304-3894
Author: Da Chena, Fuqiang Liuab, Lidan Zonga, Xiaowen Suna, Xiaopeng Zhanga, Changqing Zhua, Xuewen Taoa, Aimin Liab
Affiliations:

  • a State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China

  • b State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal Resource Reuse, Nanjing 210046, PR China
  • Abstract: rated adsorptive technique combining an m-cresol adsorption unit, an acid retardation unit and an m-toluidine adsorption unit in sequence was designed to recover m-cresol and m-toluidine from highly acidic and salty m-cresol manufacturing wastewater. In the first column packed with hypercrosslinked polymeric resin (NDA-99), most m-cresol was captured through π-π and hydrogen-bonding interactions as well as the salting-out effect, while m-toluidine was not absorbed due to protonation. To separate acid from salt, an acid retardation unit was introduced successively to adsorb sulfuric acid by strong base anion exchange resin (201 × 7). After the acid retardation unit and mild neutralization reaction, the last column filled with NDA-99 was applied to trap neutral m-toluidine from the salty effluent. Moreover, the eluent of the acid retardation unit was utilized as the regenerant to recover m-toluidine, and the recycled high-acidity and low-salinity solution of m-toluidine was directly used to produce m-cresol as the raw material. Therefore, the proposed method not only efficiently recycled m-cresol and m-toluidine, but also reduced the consumption of alkali dramatically (saving 0.1628 t/t wastewater). These findings will inspire design of integrated adsorptive techniques for treating complex organic wastewater with high efficiency and low cost.
    Accepted: 21 March 2016
    Received: 22 December 2015
    Revised: 10 March 2016
    Keywords: m-Cresol; m-Toluidine; Acidic wastewater; Salty wastewater; Integrated adsorption
    Email: jogia@163.com

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