Extraction of hexavalent chromium from wastewater using novel rotating zigzag contactor

IF 0.9 Q4 ENGINEERING, CHEMICAL

Indian Chemical Engineer Pub Date : 2022-09-28 DOI:10.1080/00194506.2022.2125839

S. Karmakar, A. Bhowal, P. Das

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Abstract

ABSTRACT HIGEE (an acronym of high gravity) devices have attracted considerable attention among the researchers due to its immense process intensification capability. In order to achieve desired process efficiency this technology replaces terrestrial acceleration by centrifugal one (typically 1000g) which can be attained by rotating a specially shaped rigid bed. This study focuses on liquid–liquid extraction of hexavalent chromium [Cr(VI)] from wastewater using aliquat-336 as an extractant inside a novel rotating zigzag contactor (RZC). Extraction efficiency of RZC were observed with the variation in pH (2–10), rotational speed (300–1100rpm), aqueous phase (0.4–1.2 L-min−1) and organic phase (0.05–0.15 L-min−1) flow rate, feed (25–200 mg-L−1) and extractant (0.5–1.25 vol%) concentration. The results obtained from this study showed a significant improvement in extraction efficiency (85–99%) with the variation in rotational speed (300–1100rpm). It was observed that the efficiency increased with rotational speed, total flow rate and the organic phase flow rates but decreased with the feed concentration and pH of the aqueous solution. Comparison with some conventional contactors reveals that the extraction efficiency obtained in RZC was nearly 40–50% higher under the same operating conditions. GRAPHICAL ABSTRACT

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新型旋转锯齿形接触器从废水中提取六价铬

摘要HIGEE（高重力的缩写）装置由于其巨大的过程强化能力而引起了研究人员的广泛关注。为了实现所需的工艺效率，该技术用离心加速度（通常为1000g）代替地面加速度，离心加速度可以通过旋转特殊形状的刚性床来实现。本研究的重点是在一种新型旋转Z字形接触器（RZC）内，使用Liquat-336作为萃取剂，从废水中液-液萃取六价铬[Cr（VI）]。RZC的提取效率随pH（2–10）、转速（300–1100rpm）、水相（0.4–1.2 L-min−1）和有机相（0.05–0.15 L-min−2）流速、进料（25–200 mg-L−1）以及萃取剂（0.5–1.25 vol%）浓度的变化而变化。这项研究的结果表明，随着转速（300–1100rpm）的变化，萃取效率显著提高（85–99%）。观察到效率随着转速、总流速和有机相流速而增加，但随着进料浓度和水溶液的pH而降低。与一些传统接触器的比较表明，在相同的操作条件下，RZC获得的萃取效率高出近40-50%。图形摘要

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来源期刊

Indian Chemical Engineer ENGINEERING, CHEMICAL-

CiteScore

3.00

自引率

6.70%

发文量