Solvent extraction and supercritical water oxidation; A hybrid method for oil sludge remediation

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-09-11 DOI:10.1016/j.jwpe.2025.108729

Saeed Rahimi Hardorodee , Ahmad Hallajisani , Roya Mafigholami , Karim Ghasemipanah

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Abstract

In this research, a dual approach involving solvent extraction and supercritical water oxidation was employed to recover and enhance oil sludge. Initially, for the solvent extraction phase, experiments were performed utilizing Design Expert software to analyze the impact of temperature settings ranging from 25 to 50 °C, duration between 10 and 30 min, and a solvent-to-sludge ratio varying from 2 to 8. Additionally, the influence of using different solvents, specifically ethanol and hexane, for hydrocarbon extraction from the sludge was examined. The experimental findings indicated that the ideal conditions for solvent extraction were a temperature of 35 °C, a duration of 20 min, and a solvent-to-sludge ratio of 5.5, under which the solvents successfully separated 68 % of the petroleum hydrocarbons present in the oil sludge sample. In the subsequent phase, the supercritical water oxidation process was implemented to recover and enhance the quality of the resultant products. The experimental design was executed using response surface methodology, under the following parameters: temperature between 390 and 450 °C, duration of 30 to 90 min, a water-to-feed ratio of 1 to 5, and a hydrogen-to-feed ratio of 2 to 1. Among these variables, the water-to-feed ratio was found to have the most significant impact on the efficiency of the supercritical oxidation process. The optimal conditions were identified as a temperature of 420 °C, a duration of 60 min, and a water-to-feed ratio of 3, under which 64 % of hydrocarbon compounds were recovered. The presence of water enhances the concentration of OH radicals, thereby increasing the reaction rate, which ultimately boosts the yield of recovered products. In the final stage, the influence of various weight ratios of zeolite catalyst (5, 50, 20, 10, and 100 %) was assessed to improve product quality. The test results revealed that at a catalyst ratio of 10 %, 84 % of the products were successfully recovered. The findings of this research demonstrate that the integration of solvent extraction and supercritical catalytic oxidation with water is both effective and efficient in recovering hydrocarbons from oil sludge.

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溶剂萃取和超临界水氧化；油泥混合修复方法研究

本研究采用溶剂萃取和超临界水氧化双重方法对油泥进行回收和处理。首先，在溶剂萃取阶段，利用Design Expert软件进行实验，分析温度设置范围为25至50°C，持续时间为10至30分钟，溶剂与污泥的比例为2至8的影响。此外，还考察了不同溶剂（特别是乙醇和己烷）对污泥中烃类提取的影响。实验结果表明，溶剂萃取的理想条件是温度为35℃，萃取时间为20 min，溶剂污泥比为5.5，在此条件下，溶剂可成功分离油泥样品中68%的石油烃。在随后的阶段，实施超临界水氧化工艺，以回收和提高产品的质量。实验设计采用响应面法，在以下参数下进行：温度在390至450°C之间，持续时间为30至90分钟，水料比为1:5，氢料比为2:1。在这些变量中，水料比对超临界氧化过程效率的影响最为显著。最佳工艺条件为温度420℃，时间60 min，水料比为3，在此条件下，烃类化合物的回收率为64%。水的存在提高了OH自由基的浓度，从而提高了反应速率，最终提高了回收产物的收率。在最后阶段，评估了沸石催化剂的不同重量比（5、50、20、10和100%）对产品质量的影响。实验结果表明，在催化剂配比为10%的情况下，产品的回收率为84%。研究结果表明，溶剂萃取与超临界水催化氧化相结合是回收油泥中烃类的有效方法。

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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