SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 49 ›› Issue (9): 205-212.DOI: 10.1016/j.cjche.2021.08.003

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Enhanced Mn2+ solidification and NH4+-N removal from electrolytic manganese metal residue via surfactants

Jiancheng Shu1, Xiangfei Zeng1, Danyang Sun1, Yong Yang2, Zuohua Liu2, Mengjun Chen2, Daoyong Tan1   

  1. 1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
    2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-04-11 Revised:2021-07-26 Online:2022-10-19
  • Contact: Jiancheng Shu,E-mail:sjcees@126.com
  • Supported by:
    This work was supported by National Natural Science Foundation of China (52174386, 21806132), the National Key Research and Development Program of China (2018YFC1903500), the Science and Technology Plan Project of Sichuan Province (2021YFH0058) and the Key Research and Development Program of Guangxi Province (AB18126088).

Enhanced Mn2+ solidification and NH4+-N removal from electrolytic manganese metal residue via surfactants

Jiancheng Shu1, Xiangfei Zeng1, Danyang Sun1, Yong Yang2, Zuohua Liu2, Mengjun Chen2, Daoyong Tan1   

  1. 1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
    2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • 通讯作者: Jiancheng Shu,E-mail:sjcees@126.com
  • 基金资助:
    This work was supported by National Natural Science Foundation of China (52174386, 21806132), the National Key Research and Development Program of China (2018YFC1903500), the Science and Technology Plan Project of Sichuan Province (2021YFH0058) and the Key Research and Development Program of Guangxi Province (AB18126088).

Abstract: Electrolytic manganese metal residue (EMMR) harmless treatment has always lacked a low-cost and quick processing technology. In this study, surfactants, namely tetradecyl trimethylammonium chloride (TTC), sodium dodecyl benzene sulfonate (SDBS), sodium lignin sulfonate (SLS), and octadecyl trimethylammonium chloride (OTC), were used in the solidification of Mn2+ and removal of NH4+-N from EMMR. The Mn2+ and NH4+-N concentrations under different reaction conditions, Mn2+ solidification and NH4+-N removal mechanisms, and leaching behavior were studied. The results revealed that the surfactants could enhance the Mn2+ solidification and NH4+-N removal from EMMR, and the order of enhancement was as follows: TTC > SDBS > OTC > SLS. The NH4+-N and Mn2+ concentrations were 12.3 and 0.05 mg·L-1 with the use of 60.0 mg·kg-1 TTC under optimum conditions (solid–liquid ratio of 1.5:1, EMMR to BRM mass ratio of 100:8, temperature of 20 ℃, and reaction duration of 12 h), which met the integrated wastewater discharge standard (GB8978-1996). Mn2+ was mainly solidified as Mn(OH)2, MnOOH and MnSiO3, and NH4+-N in EMMR was mostly removed in the form of ammonia. The results of this study could provide a new idea for cost-effective EMMR harmless treatment.

Key words: Electrolytic manganese metal residue, Mn2+ solidification, NH4+-N removal, Surfactants

摘要: Electrolytic manganese metal residue (EMMR) harmless treatment has always lacked a low-cost and quick processing technology. In this study, surfactants, namely tetradecyl trimethylammonium chloride (TTC), sodium dodecyl benzene sulfonate (SDBS), sodium lignin sulfonate (SLS), and octadecyl trimethylammonium chloride (OTC), were used in the solidification of Mn2+ and removal of NH4+-N from EMMR. The Mn2+ and NH4+-N concentrations under different reaction conditions, Mn2+ solidification and NH4+-N removal mechanisms, and leaching behavior were studied. The results revealed that the surfactants could enhance the Mn2+ solidification and NH4+-N removal from EMMR, and the order of enhancement was as follows: TTC > SDBS > OTC > SLS. The NH4+-N and Mn2+ concentrations were 12.3 and 0.05 mg·L-1 with the use of 60.0 mg·kg-1 TTC under optimum conditions (solid–liquid ratio of 1.5:1, EMMR to BRM mass ratio of 100:8, temperature of 20 ℃, and reaction duration of 12 h), which met the integrated wastewater discharge standard (GB8978-1996). Mn2+ was mainly solidified as Mn(OH)2, MnOOH and MnSiO3, and NH4+-N in EMMR was mostly removed in the form of ammonia. The results of this study could provide a new idea for cost-effective EMMR harmless treatment.

关键词: Electrolytic manganese metal residue, Mn2+ solidification, NH4+-N removal, Surfactants