Supercritical water oxidation for the treatment and utilization of organic wastes: Factor effects, reaction enhancement, and novel process

超临界水氧化 超临界流体 高级氧化法 化学工程 环境友好型 降级(电信) 停留时间(流体动力学) 化学 热液循环 水处理 过程(计算) 废物管理 环境化学 材料科学 有机化学 催化作用 环境科学 环境工程 计算机科学 操作系统 工程类 生态学 电信 岩土工程 生物
作者
Yanhui Li,Yuanwang Duan,Shuzhong Wang,Fan Zhang,Jianna Li,Zheng Dai,Zicheng Li,Yishu Zhang,Yulong Wang
出处
期刊:Environmental Research [Elsevier BV]
卷期号:251: 118571-118571 被引量:6
标识
DOI:10.1016/j.envres.2024.118571
摘要

Supercritical water oxidation (SCWO) has been regarded as a new and efficient technology for the harmless treatment and energy utilization of organic wastes, resulting in the quickly homogeneous oxidation between organics and oxidizers and the former being wholly degraded into small environment-friendly green molecules such as H2O and N2 and inorganic salts. This paper systematically analyzed the influencing behavior and mechanisms of the reaction factors, such as temperature, pressure, residence time, oxidant type, oxidation coefficient, and the concentration and pH values of the raw material, on the treatment effect of organic wastes. For most organic wastes, the SCWO conditions at 550 °C with a residence time of 1min and an oxidation coefficient of 100% can meet the removal rate of more than 99%. To further enhance the degradation rate of organics, the principles, implementation cases, and related equipment components of general enhancement technologies of supercritical water oxidation were discussed, such as fractional oxygen injection, auxiliary fuel co-oxidation, and hydrothermal flame-assisted degradation. This paper proposes a novel supercritical flame-assisted oxidation process in which the reactor performs preheating, corrosion protection, and desalination functions. The use of additive-enhanced oxidation, segmented oxidation, and supercritical hydrothermal flame-assisted oxidation has achieved good results in the complicated treatment process of brutal degradation of organic matter.
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