Regeneration of the waste lubricating oil based upon flyash adsorption / solvent extraction
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ENVIRONMENTAL TOXICOLOGY AND BIOGEOCHEMISTRY OF ECOSYSTEMS
Regeneration of the waste lubricating oil based upon flyash adsorption / solvent extraction Ping Ouyang 1 & Xianming Zhang 1 Received: 3 September 2019 / Accepted: 11 December 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract In order to explore the high value-added utilization of flyash adsorption in regenerating waste lubricating oil, the main factors related to the flyash adsorption was investigated by the single-factor tests, and then the optimum process conditions for flyash adsorption was obtained by means of the orthogonal experiments, and in terms of several indexes, such as kinematic viscosity (40 °C), acid number, mechanical impurity and moisture, the combined process of flyash adsorption/solvent extraction was discussed and finally compared with previous studies. The experimental results prove that flyash has a good effect in adsorbing waste lubricating oil, and the solvent extraction-flyash adsorption process has a better effect in the regeneration of waste lubricating oil than the flyash adsorption-solvent extraction process. Keywords Flyash . Waste lubricating oil . Adsorption . Solvent extraction . Regeneration
Introduction China is the biggest coal producer and consumer, and the second largest consumer of lubricants in the world. Every year, the thermal power plants produce a great deal of flyash which is also the solid waste. Featured by low added value on the renewable products and low utilization rate, flyash however has strong adsorption capacity due to the high porosity and large surface area. Also, in the context of increasing energy shortage in the world, the regeneration of waste lubricating oil has become a problem that must be solved urgently (Li et al. 2016; Yang et al. 2015). The traditional sulfuric acid-clay process for the regeneration of waste lubricating oil had given rise to masses of secondary pollutants, such as acid sludge and waste gas. Also, it had the problems of long production cycle, massive energy consumption, and serious equipment corrosion (Dai 2009; Gao et al. 2009). Both of the adsorption method and the Responsible editor: Philippe Garrigues * Ping Ouyang [email protected] 1
Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
solvent extraction method are the important processes for the regeneration of waste lubricating oil (Abdel-jabbar et al. 2010; Hsu and Liu, 2011; Liu and Ouyang, 2016; Su and Fang, 2016; Zhang et al. 2014). The flyash adsorption method has been widely applied in adsorbing waste water, waste gas, and microwave (Ahmaruzzaman and Gupta, 2012; He 2002; Huang et al. 2009; Kim 2010; Liu et al. 2017; Liu et al. 2018; Liu 2009; Ma et al. 2016; Wei et al. 2015; Ren et al. 2006; Xie et al. 2013; Xu et al. 2009; Yang and Cai, 1997; Yuan and Liu, 2012; Zeng et al. 2015; Zhao et al. 2009; Zuo et al. 2011), for example, Huang et al. found that the high-iron
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