Cr(VI) removal by Fe-biochar composite derived from co-pyrolysis of rubber tree waste and steel sludge

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-23 DOI:10.1016/j.jwpe.2025.108387

Kwangsuk Yoon , Taewoo Lee , Joohyung Lee , Heuiyun Lee , Yup Yoo , Hyungtae Cho , Hocheol Song

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Abstract

Global industrialization has led to an increase in waste generation, necessitating the development of sustainable management strategies. Pyrolysis can convert waste into valuable products such as biochar and syngas. This study investigates the co-pyrolysis of rubber tree waste (RT) and pipe sludge (PS) to produce Fe-biochar, which was utilized as a reactive medium for formic acid (FA)-mediated Cr(VI) removal. Pyrolysis was performed at varying RT-to-PS mass ratios, and the physicochemical properties of the resulting Fe-biochars were analyzed. Syngas monitoring and biocrude composition analysis were scrutinized to experimentally assess the catalytic effects of PS on the pyrogenic product formation. The Cr(VI) removal performance of the composite was explored in de-ionized water (DIW) and groundwater (GW) conditions, while computational fluid dynamics (CFD) modeling was employed to evaluate its field-scale applicability. The results demonstrate that PS played a key role in enhancing syngas (CO) production, which simultaneously limited biocrude formation. Fe-biochar produced at 800 °C exhibited the highest Cr(VI) removal efficiency due to its well-defined porous structure and the presence of redox-active Fe phases (Fe⁰ and FeO). The biochar showed higher Cr(VI) removal in GW than in DIW, attributed to formation of Fe-SO₄²⁻ complexes, which enhanced redox reactions with Cr(VI). CFD modeling demonstrated the potential of Fe-biochar for field-scale GW remediation, highlighting the importance of optimized formic acid (FA) injection in Cr(VI) removal. These findings signify that the co-pyrolysis of RT and PS offers an eco-friendly waste management approach, while providing an effective medium for remediating water pollution.

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橡胶树废弃物与钢铁污泥共热解制备的铁炭复合材料去除Cr(VI

全球工业化导致废物产生增加，因此有必要制定可持续的管理战略。热解可以将废物转化为有价值的产品，如生物炭和合成气。本研究研究了橡胶树废弃物（RT）和管道污泥（PS）共热解制备铁生物炭，并将其作为甲酸（FA）介导的Cr（VI）脱除的反应介质。在不同的rt - ps质量比下进行热解，并分析所得铁生物炭的物理化学性质。通过合成气监测和生物原油组成分析，实验评估了PS对热解产物形成的催化作用。研究了该复合材料在去离子水（DIW）和地下水（GW）条件下的Cr（VI）去除性能，并利用计算流体动力学（CFD）模型评估了其现场规模的适用性。结果表明，PS在提高合成气（CO）产量方面发挥了关键作用，同时限制了生物原油的形成。在800℃下制备的铁生物炭由于具有良好的多孔结构和氧化还原活性的铁相（Fe0和FeO）的存在，表现出最高的Cr（VI）去除效率。生物炭在GW中的Cr（VI）去除率高于在DIW中的，这是由于Fe-SO42−络合物的形成，促进了与Cr（VI）的氧化还原反应。CFD模型显示了fe -生物炭在现场规模GW修复中的潜力，强调了优化甲酸（FA）注入对Cr（VI）去除的重要性。这些研究结果表明，RT和PS共热解提供了一种环保的废物管理方法，同时为水污染的修复提供了有效的介质。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies