Removal of chromium from synthetic wastewater by electrocoagulation and using natural coagulant (blend of hen eggshell powder with lime): optimization of response surface methodology

IF 5.7 3区 环境科学与生态学 Q1 WATER RESOURCES
Werkne Sorsa Muleta, Firomsa Bidira Abdi, Endrias Adane Bekele
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Abstract

Water is a limited natural resource that is essential for both the survival of the environment and all forms of life. Nowadays, heavy metal pollution containing Cr has put serious threat to our environment. It can enter into soil, water, and even particulate matter in air, and can be harmful to human health and wild life. In this work, the removal of Cr from synthetic wastewater by electrocoagulation supported by natural coagulant (eggshell powder) with aluminum electrodes was investigated. The central composite design of the response surface methodology was employed to estimate and optimize process variables, such as initial Cr concentration (225–475 mg/L), solution pH (5–9), and current density (0.35–045 A/m2), and treatment time (30–40 min) with an electrode distance (ED) of 0.5 and 1 cm, respectively. 99.90% and 99.74% of removal efficiencies were observed at initial Cr concentration of 456.11 mg/L, a solution pH of 5.45, with current density of 0.47 A/m2, and treatment time of 36.84 min. The analysis of variance (ANOVA) was performed, and the multiple correlation coefficients (R2) of both ED were found to be 0.9996 and 0.9955, which confirms the significance of the predicted model. Furthermore, X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller analysis, and thermogravimetric analysis were used to characterize the crystal structure, functional groups, specific surface area, and thermal stability of the coagulants (eggshell powder). The findings of this study suggest that using this natural coagulant, synthetic wastewater can be treated in a more cost-effective and simple way than other existing method.

电絮凝法和天然混凝剂(蛋壳粉与石灰混合)去除合成废水中的铬:响应面法的优化
水是一种有限的自然资源,对环境的生存和所有形式的生命都至关重要。目前,含铬的重金属污染已经对我们的环境造成了严重的威胁。它可以进入土壤、水体,甚至空气中的颗粒物,对人体健康和野生动物有害。研究了天然混凝剂(蛋壳粉)负载铝电极电絮凝法去除合成废水中的铬。采用响应面法的中心复合设计,对初始Cr浓度(225 ~ 475 mg/L)、溶液pH(5 ~ 9)、电流密度(0.35 ~ 045 A/m2)、处理时间(30 ~ 40 min)、电极距离(ED)分别为0.5 cm和1 cm的工艺变量进行了估计和优化。在初始Cr浓度为456.11 mg/L、溶液pH为5.45、电流密度为0.47 a /m2、处理时间为36.84 min的条件下,去除率分别为99.90%和99.74%。方差分析结果表明,两种ED的多重相关系数(R2)分别为0.9996和0.9955,证实了模型的显著性。利用x射线衍射、傅里叶变换红外光谱、布鲁诺尔-埃米特-泰勒分析和热重分析对混凝剂(蛋壳粉)的晶体结构、官能团、比表面积和热稳定性进行了表征。本研究结果表明,使用该天然混凝剂处理合成废水比其他现有方法更经济、更简单。
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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来源期刊
Applied Water Science
Applied Water Science WATER RESOURCES-
CiteScore
9.90
自引率
3.60%
发文量
268
审稿时长
13 weeks
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