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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Synergistic coagulation of bauxite residue-basedpolyaluminum ferric chloride for dyeing wastewater treatment
GAO Jian-yang(高建阳)1, 2, GAO Fang-zhou(高方舟)3, ZHU Feng(朱锋)4, LUO Xing-hua(罗兴华)4, JIANG Jun(江钧)4, FENG Li(冯莉)1

1. Collage of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, China;
2. Research Institute of Chalco Shandong, Zibo 255061, China;
3. School of Precision Instruments and Optoelectronic Engineering, Tianjin University,
Tianjin 300072, China;
4. School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Considering that Fe, Al elements in bauxite residue are active components for water purification, an effective polyaluminum ferric chloride (PAFC) coagulant derived from bauxite residue, with Fe2O3 content > 5.1%, Al2O3 % > 6.5%, basicity > 65%, was successfully prepared. The effect of as-prepared PAFC on the zeta potential for printing and dyeing wastewater was investigated. Comparing with polyferric chloride (PFC) and polyferric sulfate (PFS) for printing and dyeing wastewater treatment, prepared bauxite residue-based PAFC exhibited the optimal performance in the aspects of chromaticity and chemical oxygen demand (COD) removal rate. Furthermore, the combination of bauxite residue-based PAFC and PFS for synergy coagulation of such wastewater demonstrated an obvious positive effect. With the proportion between as-prepared PAFC and PFS to be 2.5:1, the COD of treated wastewater could be further reduced to meet the national level A standard of China, providing a promising route to solve the problem of substandard printing and dyeing sewage outfall by a simple coagulation strategy.

 

Key words: bauxite residue; polyaluminum ferric chloride (PAFC); synergy coagulation; printing and dyeing wastewater

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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