Chemical oxygen demand (COD) reduction in wastewater from the textile industry by coagulation-flocculation and adsorption

IF 2.9 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Monitoring and Assessment Pub Date : 2025-04-10 DOI:10.1007/s10661-025-13987-7

Soufiane Youcef, Meriem Chebbi, Leila Youcef, Mohamed Ghrissi Bouaziz, Amina Soudani, Amane Sahli, Chaima Deroues

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Abstract

The aim of this work was to test the effectiveness of coagulation-flocculation using ferric chloride (FeCl₃) and adsorption on a biochar (OSB) prepared in the laboratory and their combination on textile industry wastewater treatment. By coagulation-flocculation, increasing the dose of FeCl₃ significantly improved the reduction of chemical oxygen demand (COD) levels as well as turbidity in the wastewater. The COD value (1520 mg O₂/L) decreased as the coagulant dose increased, reaching a value of 240 mg/L corresponding to an optimum FeCl₃ dose of around 2500 mg/L. When adsorption was applied to the biochar after 4 h of agitation, the COD reduction efficiency was 83.65%. Application of the kinetic models confirmed that chemisorption of the pollutants presented by the COD on the surface of OSB was predominant. COD reduction efficiency improved significantly with increasing adsorbent dose and wastewater initial pH variations. Combining the two processes, starting with coagulation-flocculation followed by adsorption on OSB, was a cost-effective technique. This satisfactory result was based on the fact that this combination enables a lower dose of coagulant (2500 to 100 mg/L) and adsorbent (4 to 2 g/L) to be used than that required when treating by each process alone.

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通过混凝-絮凝和吸附减少纺织业废水中的化学需氧量（COD）

研究了氯化铁（FeCl3）混凝与生物炭（OSB）吸附及其组合处理纺织工业废水的效果。通过混凝-絮凝，增加FeCl3的投加量可显著提高废水中化学需氧量（COD）的降低水平和浊度。COD值（1520 mg O2/L）随着混凝剂剂量的增加而降低，达到240 mg/L，对应的最佳FeCl3剂量为2500 mg/L左右。搅拌4 h后对生物炭进行吸附，COD的还原效率为83.65%。动力学模型的应用证实了OSB表面COD对污染物的化学吸附作用占主导地位。随着吸附剂用量的增加和废水初始pH值的变化，COD的还原效率显著提高。将两种工艺结合起来，从混凝-絮凝开始，然后在OSB上吸附，是一种经济有效的技术。这一令人满意的结果是基于这样一个事实，即这种组合可以使用较低剂量的混凝剂（2500至100毫克/升）和吸附剂（4至2克/升），而不是单独使用每种工艺时所需的剂量。

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

Environmental Monitoring and Assessment 环境科学-环境科学

CiteScore

4.70

自引率

6.70%

发文量

1000

审稿时长

7.3 months

期刊介绍： Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.