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Synergistic coagulation of bauxite residue-based polyaluminum ferric chloride for dyeing wastewater treatment

赤泥基PAFC 协同混凝印染污水的试验研究

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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.

摘要

利用赤泥所含有的Fe、Al 等具有净水作用的元素,制备出Fe2O3 含量>5.1%、Al2O3 含量>6.5%、 碱度>65%的赤泥基PAFC,考察了赤泥基PAFC 对印染污水zeta 电位的影响。对赤泥基聚合氯化铝铁 (PAFC)、聚合氯化铝(PAC)、聚合氯化铁(PFC)和聚合硫酸铁(PFS)在印染污水处理中进行混 凝对比的研究表明,赤泥基PAFC 在色度和COD 去除率方面明显优于同类产品。 进一步对比研究PAFC 和PFS 协同混凝的效果,优化出赤泥基PAFC 正向协同混凝PFS,按照2.5:1 的投料比,可进一步降 低印染污水COD 去除率,达到国家1 级A 的标准,很好地解决了印染污水外排不达标的难题。

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Authors and Affiliations

  1. Collage of Chemical Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Jian-yang Gao  (高建阳) & Li Feng  (冯莉)

  2. Research Institute of Chalco Shandong, Zibo, 255061, China

    Jian-yang Gao  (高建阳)

  3. School of Precision Instruments and Optoelectronic Engineering, Tianjin University, Tianjin, 300072, China

    Fang-zhou Gao  (高方舟)

  4. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Feng Zhu  (朱锋), Xing-hua Luo  (罗兴华) & Jun Jiang  (江钧)

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  1. Jian-yang Gao  (高建阳)
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Correspondence to Jun Jiang  (江钧) or Li Feng  (冯莉).

Additional information

Foundation item: Project(BE2015628) supported by Jiangsu Province Science and Technology Support Program, China

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Gao, Jy., Gao, Fz., Zhu, F. et al. Synergistic coagulation of bauxite residue-based polyaluminum ferric chloride for dyeing wastewater treatment. J. Cent. South Univ. 26, 449–457 (2019). https://doi.org/10.1007/s11771-019-4017-7

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