纺织学报 ›› 2022, Vol. 43 ›› Issue (02): 196-201.doi: 10.13475/j.fzxb.20211101906

• 染整与化学品 • 上一篇    下一篇

天然黏土矿物在靛蓝染色废水电絮凝中的应用

张梦迪1, 张维1,2,3, 姚继明1,2()   

  1. 1.河北科技大学 纺织服装学院, 河北 石家庄 050018
    2.河北省纺织服装技术创新中心,河北 石家庄 050018
    3.江苏省纺织印染节能减排与清洁生产工程中心, 江苏 苏州 215021
  • 收稿日期:2021-11-13 修回日期:2021-11-24 出版日期:2022-02-15 发布日期:2022-03-15
  • 通讯作者: 姚继明
  • 作者简介:张梦迪(1997—),男,硕士生。主要研究方向为纺织品清洁生产。
  • 基金资助:
    河北省重点研发计划项目(20374004D);江苏省纺织印染节能减排与清洁生产工程研究中心开放课题(SDGC2105);河北省省属高校基本科研业务专项资金资助(2021YWF17)

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 Published:2022-02-15 Online:2022-03-15
  • Contact: YAO Jiming

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摘要：

为提高靛蓝染色废水电絮凝处理效率,以天然黏土矿物为协同吸附剂,采用电絮凝-吸附联合工艺处理靛蓝染色废水。探究黏土类型对絮体沉降速率和Zeta电位的影响,通过废水色度、浊度、脱色率和化学需氧量(COD)去除率评价絮凝处理效果。确定最佳黏土矿物种类并结合絮体显微观察,进一步分析黏土矿物与电絮凝的协同作用机制。结果表明:黏土矿物加入可降低Zeta电位绝对值;硅藻土与电絮凝协同的主要絮凝机制为网捕卷扫,同时兼具一定的电荷中和与吸附架桥作用;电絮凝反应结束后,仅需加入1 g/L硅藻土反应3 min,Zeta电位绝对值可达到最低,为15.585 mV,废水脱色率提升至94.08%。

关键词: 电絮凝, 黏土矿物, 靛蓝, 染色废水, 硅藻土, 废水处理

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

中图分类号: 

  • X791

图1

黏土矿物类型对沉降速率的影响"

表1

黏土矿物类型对Zeta电位的影响"

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

图2

黏土矿物协同处理效果 注:a—空白;b—硅藻土;c—高岭土;d—活性白土;e—白蛭石粉。"

表2

黏土矿物类型对处理效果的影响"

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

图3

投加顺序对废水浊度和脱色率的影响"

图4

不同投加顺序处理后絮体显微镜照片"

图5

反应时间对沉降速率的影响"

图6

反应时间对废水脱色率的影响"

图7

硅藻土质量浓度对废水脱色率和Zeta电位的影响"

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