Comparative analysis of coagulants for selective removal of iron and aluminum from galvanic wastewater: A practical and effective approach

IF 6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Ain Shams Engineering Journal Pub Date : 2025-04-17 DOI:10.1016/j.asej.2025.103393

Fernando García-Ávila , Erika Mayancela-Santander , Belén Alvarado-Pacheco , Lorgio Valdiviezo-Gonzales , Manuel Cadme-Galabay , Cesar Zhindón-Arévalo , Patricia Reynoso-Quispe

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Abstract

This research aimed to evaluate three coagulants (aluminum sulfate, polyaluminum chloride, and ferric chloride) for the selective removal of iron and aluminum from wastewater generated during the pickling process in the galvanic industry. Jar tests were conducted at pH levels of 5.5 and 11, adjusted using lime. Results indicated that aluminum sulfate was the most effective coagulant, achieving a 97.91% removal of iron and a 93.09% removal of aluminum at pH 5.5 with specific dosages. The study established that optimal metal removal occurs at pH 5.5, with a necessary lime concentration of 7.5%. Statistical analyses, including MANOVA and ANOVA, confirmed significant relationships between metal removal efficiency, coagulant type, dosage, concentration, and pH. The Tukey-HSD test indicated distinct behaviors among coagulants, while the Mahalanobis Distance test highlighted specific relationships among the study variables. Overall, aluminum sulfate and polyaluminum chloride are recommended for effective wastewater treatment in the electroplating industry.

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混凝剂选择性去除电镀废水中铁和铝的比较分析：一种实用有效的方法

本研究旨在评价三种混凝剂（硫酸铝、聚合氯化铝和氯化铁）对电镀工业酸洗废水中铁和铝的选择性去除效果。在pH值为5.5和11的条件下进行罐子试验，用石灰进行调整。结果表明，在特定投加量下，硫酸铝是最有效的混凝剂，在pH为5.5时，铁去除率为97.91%，铝去除率为93.09%。研究表明，在pH为5.5、石灰浓度为7.5%的条件下，金属去除效果最佳。包括方差分析（MANOVA）和方差分析（ANOVA）在内的统计分析证实了金属去除效率、混凝剂类型、剂量、浓度和ph之间存在显著关系。Tukey-HSD检验显示了混凝剂之间的不同行为，而Mahalanobis距离检验强调了研究变量之间的特定关系。总的来说，硫酸铝和聚合氯化铝被推荐用于电镀行业的有效废水处理。

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来源期刊

Ain Shams Engineering Journal Engineering-General Engineering

CiteScore

10.80

自引率

13.30%

发文量

441

审稿时长

49 weeks

期刊介绍： in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance. Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.