Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai, 400076, India.
Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai, 400076, India.
Environ Sci Pollut Res Int. 2024 Jul;31(34):47101-47115. doi: 10.1007/s11356-024-34189-7. Epub 2024 Jul 10.
The effluent from the oil drilling site is a complex mixture of hazardous chemicals that causes environmental impacts on its disposal. The treatment of oil drill-site wastewater has not been explored much, and understanding its characteristics and optimizing the treatment process are required. In the present study, we have optimized the electrocoagulation process with aluminum electrodes for drill-site wastewater treatment. A multi-level factorial center composite design using response surface methodology is applied to optimize the effect of current density (CD), pH, and inter-electrode distance (IED) on chemical oxygen demand (COD) removal. The increasing current density shows a significant increase in COD removal, and a similar trend was observed with a decreased pH. It was found that with current density and inter-electrode distance, the maximum COD removal achieved was 70% at the CD of 19.04 mA cm and IED 2.6 cm. By varying pH and current density, the COD removal reached up to 90% at pH 6 and CD 19.04 mA cm. The study shows that the current density is the dominant factor for the process's energy consumption and operating cost, followed by pH. This study's findings could be effectively used to develop large-scale treatment processes through electrocoagulation.
油井现场的废水是一种复杂的危险化学品混合物，其处置会对环境造成影响。油井废水的处理还没有得到太多的探索，需要了解其特性并优化处理工艺。在本研究中，我们使用铝电极对油井现场废水处理进行了电凝聚工艺的优化。应用响应面法的多水平析因中心组合设计来优化电流密度（CD）、pH 值和电极间距离（IED）对化学需氧量（COD）去除的影响。增加电流密度会显著提高 COD 去除率，而降低 pH 值也呈现出类似的趋势。结果发现，在电流密度为 19.04 mA/cm 和电极间距离为 2.6 cm 时，COD 去除率最高可达 70%。通过改变 pH 值和电流密度，在 pH 值为 6 和电流密度为 19.04 mA/cm 时，COD 去除率最高可达 90%。研究表明，电流密度是该过程能耗和运行成本的主要因素，其次是 pH 值。本研究的结果可以有效地用于通过电凝聚开发大规模处理工艺。
