Petrochemical sludge is difficult to be degraded by traditional methods due to the complex organic pollutants, supercritical water oxidation (SCWO) is a promising technology for treating different industrial wastes. In this article, a comprehensive SCWO plant coupled with ammonia distillation and biochemical treatment with the processing capacity near 50 tons per day is designed. Experiments are conducted to determine the influence of reaction temperature, oxidation coefficient and residence time, meanwhile, the species of organics and the concentration of heavy metals in raw feedstock and products are also analyzed to determine the follow-up process. Furthermore, an indirect heat exchange unit between supercritical fluids, capillary device for pressure regulation, and gas–liquid–solid three-phase separator sealed by spiral are proposed to overcome the corrosion and plugging issues. Moreover, an economic evaluation including investment and running cost and the application prospect of the whole system are also analyzed in detail. These information will be significant for designing and constructing the commercial SCWO plant for other industrial wastes.

由于复杂的有机污染物，石油化学污泥很难通过传统方法降解，超临界水氧化（SCWO）是一种用于处理不同工业废物的有前途的技术。本文设计了一个综合的SCWO工厂，该工厂结合了氨蒸馏和生化处理，每天的处理能力接近50吨。通过实验确定反应温度，氧化系数和停留时间的影响，同时还分析了原料和产品中有机物的种类以及重金属的浓度，以确定后续过程。此外，超临界流体之间的间接热交换单元，用于调节压力的毛细管装置，为了克服腐蚀和堵塞问题，提出了采用螺旋密封的气液固三相分离器。此外，还详细分析了包括投资和运行成本在内的经济评价以及整个系统的应用前景。这些信息对于设计和建造用于其他工业废物的商业SCWO工厂将具有重要意义。