Sustainable utilization of plastic-derived graphene for tetracycline wastewater treatment and its recycling for biogas and biochar production

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-23 DOI:10.1016/j.jwpe.2024.106554

Gideon Mensah-Sackey , Hassan Shokry , Manabu Fujii , Mahmoud Nasr

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Abstract

While several studies have used plastic-derived graphene (PDG) for antibiotics adsorption from wastewater, there is a research gap in finding an environmental-friendly and technically feasible approach for the recycling of exhausted adsorbent. Hence, this study focuses on the utilization of PDG as an adsorbent for tetracycline removal from aqueous solutions, followed by the valorization of spent PDG for dual biogas and biochar production. In the first experiment, a tetracycline removal efficiency of 75.61 % was obtained under the optimum condition of PDG dosage = 0.03 mg/mL, initial concentration = 5.20 ppm, 77.0 min-adsorption time, and acidic pH. Supplementing the regenerated PDG to the anaerobic digestion of sludge and ethanol exhibited bio-CH₄ yield and chemical oxygen demand (COD) removal efficiency of 200.60±9.40 mL/g COD and 57.11±3.01 %, respectively. The recycling of anaerobic digestate by pyrolysis showed a biochar yield of 0.58±0.09 g/g, with a high carbon content of 55.34 % w/w. The scalability of this adsorption/digestion/pyrolysis approach for managing 1 kg PDG could be economically feasible with a payback period of 5.02 years, NPV = 297.62 USD, and internal rate of return = 10 %. This project showed less detrimental impacts on the environment, regarding the life cycle assessment (LCA) impact categories related to terrestrial ecosystem and resource recovery.

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可持续利用从塑料中提取的石墨烯处理四环素废水，并将其回收用于生产沼气和生物炭

虽然已有多项研究利用塑料衍生石墨烯（PDG）来吸附废水中的抗生素，但在寻找一种环境友好且技术上可行的方法来回收利用耗尽的吸附剂方面仍存在研究空白。因此，本研究的重点是利用 PDG 作为吸附剂，去除水溶液中的四环素，然后将废 PDG 价值化，用于沼气和生物炭的双重生产。在第一次实验中，在 PDG 用量 = 0.03 mg/mL、初始浓度 = 5.20 ppm、吸附时间 77.0 分钟和酸性 pH 值的最佳条件下，四环素的去除率为 75.61%。将再生 PDG 补充到污泥和乙醇的厌氧消化中，生物-CH4 产量和化学需氧量（COD）去除率分别为 200.60±9.40 mL/g COD 和 57.11±3.01%。通过热解回收厌氧沼渣的生物炭产量为 0.58±0.09 g/g，含碳量高达 55.34 % w/w。这种吸附/消化/热解方法可用于管理 1 千克 PDG，经济上可行，投资回收期为 5.02 年，净现值 = 297.62 美元，内部收益率 = 10%。在与陆地生态系统和资源回收有关的生命周期评估（LCA）影响类别方面，该项目对环境的不利影响较小。

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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