Sulfamethazine adsorption using livestock manure-derived biochar: Significance of oxygen concentration during biochar generation

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-05-09 DOI:10.1016/j.biombioe.2025.107970

Jiseok Hong, Hyunjung Kim, Changwon Chae, Dong Hyun Kim, Seung Oh Lee, Ijung Kim

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Abstract

This study investigated the effects of oxygen concentration (0.5–10 %) during biochar production on its characteristics and capacity for sulfamethazine adsorption. The biochar was produced from cattle manure, which was either pretreated with ZnCl₂ or left untreated, and subsequently pyrolyzed at different temperatures. Increasing oxygen concentration during pyrolysis led to biochar oxidation, which reduced its carbon content and adsorption efficiency. Higher pyrolysis temperatures and lower oxygen concentrations enhanced the sulfamethazine removal efficiency, primarily due to the increased specific surface area. Biochar produced at 0.5 % oxygen concentration maintained over 90 % removal efficiency after at least four cycles of reuse, while biochar produced at higher oxygen concentrations exhibited significant efficiency loss upon reuse. Continuous-flow experiments revealed that flow rate, column height, and initial solute concentration significantly influenced breakthrough dynamics, with optimal adsorption observed at lower flow rates and increased column height. Experiments with the livestock wastewater demonstrated that the adsorption process was conformed to the Freundlich and Elovich model, indicating that adsorption occurred unevenly across heterogeneous sites of the biochar and was controlled by mass transport as a heterogeneous diffusion process. These findings underscore the significance of regulating oxygen levels during biochar generation to enhance its viability as adsorbent.

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家畜粪便生物炭对磺胺乙胺的吸附：生物炭生成过程中氧浓度的意义

研究了生物炭生产过程中氧浓度（0.5 ~ 10%）对生物炭特性和吸附磺胺乙胺能力的影响。生物炭是由牛粪生产的，牛粪要么用ZnCl2预处理，要么不处理，然后在不同温度下进行热解。热解过程中氧气浓度的增加导致生物炭氧化，降低了生物炭的碳含量和吸附效率。较高的热解温度和较低的氧浓度提高了磺胺乙烷的脱除效率，这主要是由于比表面积的增加。在0.5%氧浓度下生产的生物炭在重复使用至少4次循环后仍保持90%以上的去除率，而在更高氧浓度下生产的生物炭在重复使用后表现出明显的效率损失。连续流动实验表明，流速、柱高和初始溶质浓度对突破动力学有显著影响，当流速较低、柱高增加时，吸附效果最佳。对畜禽废水的吸附实验表明，吸附过程符合Freundlich和Elovich模型，表明吸附在生物炭的异质位点上发生不均匀，并受质量传输控制，是一种非均质扩散过程。这些发现强调了在生物炭生成过程中调节氧气水平以提高其作为吸附剂的可行性的重要性。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.