Method of smoldering combustion for the treatment of oil sludge-contaminated soil

燃烧 环境科学 环境修复 石油 气流 污染 污水污泥 环境化学 制浆造纸工业 废物管理 土壤污染 废油 化学 土壤水分 环境工程 污水处理 土壤科学 生物 机械工程 工程类 有机化学 生态学
作者
Zirui Gan,Lejun Deng,Jianyong Wang,Guanyu Cheng,Cheng Zhao,Zhang Zhu-ping,Yuzhong Li,Zhanlong Song
出处
期刊:Waste Management [Elsevier BV]
卷期号:175: 73-82 被引量:3
标识
DOI:10.1016/j.wasman.2023.12.048
摘要

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.

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