Gan Zongwei, Deng Lejun, Wang Jianyong, Cheng Guanyu, Zhao Cheng, Zhang Zhuping, Li Yuzhong, Song Zhanlong
National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, Shandong 250061, China.
Power China SEPCO1 Electric Power Construction Co. Ltd, 7000 Jingshi Road, Jinan 250101, China.
Waste Manag. 2024 Mar 1;175:73-82. doi: 10.1016/j.wasman.2023.12.048. Epub 2024 Jan 3.
There is an urgent need to globally remediate oil sludge-contaminated soil (OSS). Smoldering combustion is a new low-energy approach for the treatment of organic waste. Therefore, the feasibility of smoldering combustion for the treatment of OSS was investigated in this study using a series of laboratory-scale experiments. The effective remediation of OSS was found to be achievable when the mass ratio of oil sludge in the sample reached 1/12 and above. Experimental results showed that smoldering at peak temperatures above 500 °C was found to completely remove petroleum hydrocarbons from the samples. The mass ratio of oil sludge in the sample had little effect on the distribution of the major elements (Si, Al, and Ca) in the smoldering products, and most of the minerals in the oil sludge adhered to the surface of the soil particles after smoldering. The smoldering heating environment is detrimental to the reusability of the soil, increases soil pH and available phosphorus content, and decreases organic carbon and total nitrogen content. Moreover, the influence of the airflow rate and material height on smoldering characteristics was investigated. Matching the appropriate airflow rate can help maintain optimal smoldering conditions, and smoldering remains stable with increasing material height. The addition of recovered oil to a sample with a low mass ratio of oil sludge can help with smoldering ignition and improve the removal efficiency of petroleum hydrocarbons. This study has confirmed that smoldering can be used to treat OSS within a broad range of oil sludge concentrations without pretreatment.
全球迫切需要对受油泥污染的土壤（OSS）进行修复。闷烧燃烧是一种处理有机废物的新型低能耗方法。因此，本研究通过一系列实验室规模的实验，研究了闷烧燃烧处理OSS的可行性。当样品中油泥的质量比达到1/12及以上时，发现可有效修复OSS。实验结果表明，在500℃以上的峰值温度下闷烧可完全去除样品中的石油烃。样品中油泥的质量比对闷烧产物中主要元素（硅、铝和钙）的分布影响较小，闷烧后油泥中的大部分矿物质附着在土壤颗粒表面。闷烧加热环境不利于土壤的再利用，会增加土壤pH值和有效磷含量，降低有机碳和总氮含量。此外，还研究了气流速率和物料高度对闷烧特性的影响。匹配适当的气流速率有助于维持最佳闷烧条件，闷烧随着物料高度的增加而保持稳定。向油泥质量比低的样品中添加回收油有助于闷烧点火并提高石油烃的去除效率。本研究证实，闷烧可用于在无需预处理的广泛油泥浓度范围内处理OSS。
