Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 196-201.doi: 10.13475/j.fzxb.20211101906

• Dyeing and Finshing & Chemicals • Previous Articles     Next Articles

Application of natural clay minerals in electrocoagulation of indigo dyeing wastewater

ZHANG Mengdi1, ZHANG Wei1,2,3, YAO Jiming1,2()   

  1. 1. College of Textile and Garment, Hebei University of Science & Technology, Shijiazhuang, Hebei 050018, China
    2. Hebei Technology Innovation Center for Textile and Garment, Shijiazhuang, Hebei 050018, China
    3. Jiangsu Engineering Research Conter of Textile Dyeing and Printing for Energy Conservation, Dischange Reduction and Claner Production(ERC), Suzhou, Jiangsu 215021, China
  • Received:2021-11-13 Revised:2021-11-24 Online:2022-02-15 Published:2022-03-15
  • Contact: YAO Jiming E-mail:yaojiming66@126.com

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Abstract:

In order to improve the efficiency of electrocoagulation of indigo wastewater, natural clay minerals were used as synergistic adsorbents to treat indigo dyeing wastewater through a combined process of electrocoagulation and adsorption. The effect of clay type on floc settlement rate and the change of Zeta potential were explored, and the flocculation effect was evaluated by the wastewater color, turbidity, decolorization rate and chemical oxygen demand removal rate. Based on the best minerals selected, the synergistic mechanism of clay minerals and electrocoagulation was further analyzed, combined with floc microscopic observation. The results showed that the addition of clay minerals can reduce the absolute value of the Zeta potential. The main flocculation mechanism of diatomaceous and electrocoagulation was net trapping and sweeping, and it also possessed certain charge neutralization and adsorption bridging effect. After the electrocoagulation reaction was finished, it only needed to add 1 g/L diatomaceous to react for 3 minutes to reduce the absolute value of Zeta potential to the lowest, which was 15.585 mV, and to increase the decolorization rate of wastewater to 94.08%.

Key words: electrocoagulation, clay mineral, indigo, dyeing wastewater, diatomaceous, wastewater treatment

CLC Number: 

  • X791

Fig.1

Effect of clay mineral types on sedimentation rate"

Tab.1

Effect of clay mineral types on Zeta potentialmV"

黏土矿物类型 Zeta电位
空白 -24.877
硅藻土 -15.585
高岭土 -6.647
活性白土 -21.086
白蛭石粉 -24.559

Fig.2

Synergistic treatment effect of clay minerals"

Tab.2

Influence of clay mineral types on treatment effect"

黏土矿物类型 色度/倍 浊度/FTU 脱色率/% COD去除率/%
空白 80 38.8 86.12 48.32
硅藻土 40 25.0 94.08 60.36
高岭土 88 45.0 80.66 54.01
活性白土 64 30.4 91.55 55.26
白蛭石粉 46 29.8 94.06 56.53

Fig.3

Effect of dosing sequence on turbidity and decolorization rate of wastewater"

Fig.4

Microscopic images of flocs after treatment with different dosing sequences. (a) Blank; (b) Dosing sequence A; (c) Dosing sequence B; (d) Dosing sequence C"

Fig.5

Effect of reaction time on sedimentation rate"

Fig.6

Effect of reaction time on decolorization rate of wastewater"

Fig.7

Effect of diatomite dosage on decolorization rate and Zeta potential of wastewater"

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