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<p>Effective management of oil drilling waste and the recycling of water from polymer-based drilling mud remain critical challenges in the oil and gas industry. This study aimed to develop an innovative and practical solution for treating drilling waste under real operational conditions. A novel approach integrating sedimentation with electrocoagulation (EC) was proposed to address these challenges. The research focused on reducing chemical oxygen demand (COD), a key indicator of polymer drilling waste pollution. Initial sedimentation achieved a notable COD reduction from 3350 to 1500&#xa0;mg/L within four days. The subsequent application of the combined sedimentation-EC process further decreased COD levels, rendering the treated water suitable for reuse in operations such as reflooding. The novelty of this work lies in its kinetic analysis, which revealed a distinct two-stage reaction mechanism including; an initial coagulation phase following pseudo-first-order kinetics and a subsequent sedimentation phase governed by pseudo-second-order kinetics. These findings underscore the effectiveness of the proposed method in achieving sustainable waste management and water reuse, offering valuable insights for advancing environmental practices in oil drilling operations.</p> Graphical abstract <p></p>

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Advancing sustainable practices: a novel sedimentation-electrocoagulation approach for efficient oil drilling waste management and water recycling

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Mostajir A.,
  • Vafajoo L.

摘要

Effective management of oil drilling waste and the recycling of water from polymer-based drilling mud remain critical challenges in the oil and gas industry. This study aimed to develop an innovative and practical solution for treating drilling waste under real operational conditions. A novel approach integrating sedimentation with electrocoagulation (EC) was proposed to address these challenges. The research focused on reducing chemical oxygen demand (COD), a key indicator of polymer drilling waste pollution. Initial sedimentation achieved a notable COD reduction from 3350 to 1500 mg/L within four days. The subsequent application of the combined sedimentation-EC process further decreased COD levels, rendering the treated water suitable for reuse in operations such as reflooding. The novelty of this work lies in its kinetic analysis, which revealed a distinct two-stage reaction mechanism including; an initial coagulation phase following pseudo-first-order kinetics and a subsequent sedimentation phase governed by pseudo-second-order kinetics. These findings underscore the effectiveness of the proposed method in achieving sustainable waste management and water reuse, offering valuable insights for advancing environmental practices in oil drilling operations.

Graphical abstract