热化学清洗含油污泥的效果评价及机理  

Performance and mechanism of thermochemical technology for oily sludge cleaning

作　　者：王宇晶 张楠[1] 刘涉江[1] 苗辰 刘秀丽 WANG Yujing;ZHANG Nan;LIU Shejiang;MIAO Chen;LIU Xiuli(School of Environmental Science&Engineering,Tianjin University,Tianjin 300350,China;Tianjin Huanke Environmental Consulting Co.,Ltd.,Tianjin 300191,China)

机构地区：[1]天津大学环境科学与工程学院,天津300350 [2]天津环科环境咨询有限公司,天津300191

出　　处：《化工进展》2022年第6期3333-3340,共8页Chemical Industry and Engineering Progress

基　　金：天津市重点研发科技支撑重点项目(19YFZCSF01090)。

摘　　要：热化学清洗法是一种处理含油污泥经济高效的方法。以无害化处理为目标,本文系统分析了热化学清洗含油污泥的效果,并对原油脱附机理进行了初步探讨。结果表明,复配型清洗剂NAS在4%(质量分数)、60℃(温度)、8∶1 (液固比)、60min (时间)的清洗条件下,可将固体残油率降低至0.94%,远低于《油气田含油污泥综合利用污染控制要求》(DB 65/T 3998—2017)等多个标准中规定的含油率≤2.0%的要求;脱附等温线模型拟合和热力学参数计算结果表明,油从固体表面的脱附符合Langmuir模型,且为自发吸热过程;结合FTIR及XRD等分析结果可知,热化学清洗法主要除去了含油污泥中原油的轻组分,重组分与固体表面发生化学吸附,成为影响原油脱附的主导因素。Thermochemical cleaning is a cost-effective method for treating oily sludge. The thermochemical cleaning effect was analyzed systematically, and the mechanism of crude oil desorption was also discussed preliminarily in this study to realize harmless treatment of oily sludge. This study showed that the compound cleaning agent NAS can reduce residual oil rate in solids to 0.94% with cleaning conditions of 4%(concentration), 60℃(temperature), 8∶1(liquid-to-solid ratio), and 60min(time), which is far lower than the requirement of oil content ≤2.0% in the "Pollution control requirements for comprehensive utilization of oil and gas field oily sludge"(DB 65/T 3998—2017) and other standards.The results of desorption isotherm model fitting and thermodynamic parameter calculation showed that the desorption of oil from solids surface conforms to the Langmuir model and was a spontaneous endothermic process. Combined with the analysis results of FTIR and XRD, it can be seen that the thermochemical cleaning method mainly removed the light components of crude oil in the oily sludge, and chemical adsorption occurred between solids surface and heavy components, which was the dominant factor affecting the desorption of crude oil.

关 键 词：含油污泥 热化学清洗 脱附 热力学 模拟 

分 类 号：X741[环境科学与工程—环境工程]