ADSORPTIVE CAPACITY OF COFFEE HUSK IN THE REMOVAL OF CHROMIUM (VI) AND ZINK (II) FROM TANNERY EFFLUENT: KINETICS AND EQUILIBRIUM STUDIES

Q2 Engineering

Water Conservation and Management Pub Date : 2020-12-31 DOI:10.26480/wcm.02.2021.72.78

Desalegn Abdissa, Temesgen Abeto, Yigezu Mekonnen, Dejene Beyene

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引用次数: 2

Abstract

Tannery wastewater is the most challenging due to the complex toxic pollutants it releases into the environment. Similarly, coffee husk from coffee processing operations pollutes the environment. The use of coffee husk to remove hexavalent chromium (VI) and Zink (II)from tannery wastewater solves pollution problems due to untreated tannery wastewater and coffee husk. A batch adsorption process was conducted to determine chromium (VI) and Zink (II)adsorptive capacity of waste coffee husk to treat tannery wastewater. The effects of adsorbent dose (0.2-2.4 g/L), contact time (20- 60 min), agitation speed (50-250 rpm), and pH value (2-8) on the adsorptive capacity of coffee husk on the removal of hexavalent chromium (VI) & zinc (II) from tannery wastewater were studied. Using 2.4 g/L adsorbent dose, 250 rpm agitation speed, 60 min contact time, and pH value of 2, a maximum Cr(VI) removal capacity of coffee husk was 83%. The maximum Zn(II) removal capacity of coffee husk was found to be 79% at an adsorbent dose of 2.4 g/L, 60 min contact time, pH 7, and agitation speed of 250 rpm. Therefore, it can be concluded that coffee husk achieved significant removal of hexavalent chromium (VI) and zinc (II) from tannery wastewater.

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从制革厂废水中去除铬(vi)和锌(ii)时咖啡壳的吸附能力:动力学和平衡研究

制革厂废水是最具挑战性的，因为它释放到环境中复杂的有毒污染物。同样，咖啡加工过程中的咖啡壳也会污染环境。利用咖啡壳去除制革厂废水中的六价铬(VI)和锌(II)，解决了未经处理的制革厂废水和咖啡壳造成的污染问题。采用间歇吸附法测定了废咖啡壳处理制革废水中铬(VI)和锌(II)的吸附量。研究了吸附剂用量(0.2 ~ 2.4 g/L)、接触时间(20 ~ 60 min)、搅拌速度(50 ~ 250 rpm)和pH值(2 ~ 8)对咖啡壳吸附能力对制革废水中六价铬(VI)和锌(II)去除效果的影响。在吸附剂用量为2.4 g/L、搅拌转速为250 rpm、接触时间为60 min、pH值为2的条件下，咖啡壳的Cr(VI)去除率最高可达83%。当吸附剂用量为2.4 g/L、接触时间为60 min、pH为7、搅拌转速为250 rpm时，咖啡壳对Zn(II)的最大去除率为79%。由此可见，咖啡壳对制革废水中六价铬(VI)和锌(II)的去除效果显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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