Oil sludge recycling by ash-catalyzed pyrolysis-reforming processes

Gong

Environmental Engineering Research

et al. 2020

With the enhancement of public awareness of environmental protection, the harm of oily sludge has gradually been paid attention to. As a kind of dangerous solid waste, the arbitrary disposal of oily sludge will cause quite serious harm to both the environment and human beings. Research on the treatment methods of oily sludge has become a hot spot recently. At present, treatment methods of oily sludge are various, mainly including pyrolysis, direct combustion, freeze-thaw treatment, biological treatment, solvent extraction, thermochemical cleaning, ultrasound-assisted treatment or joint technology, etc. Based on the consideration of economic benefits, social benefits and treatment difficulties, pyrolysis has been considered to be the most appropriate method for oily sludge treatment. Syngas, liquid oil and char can be obtained from pyrolysis of oily sludge, which can meet different needs. In this paper, the pyrolysis technology of oily sludge is reported in detail, including pyrolysis methods, operational parameters and pyrolysis products of oily sludge. On the basis, the advantages and limitations of oily sludge pyrolysis technology are discussed, together with the report of feasibility of pyrolysis technology of oily sludge. Moreover, the development trend of pyrolysis technology of oily sludge is prospected for the future work.

Section: Grind and MIXmentioning

confidence: 99%

Section: Pyrolysis Of Oily Sludgementioning

confidence: 99%

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Application and development of pyrolysis technology in petroleum oily sludge treatment

Gong

Environmental Engineering Research

et al. 2020

“…The recovered oil could be used as fuels or sources of other valuable chemical products [5]. Furthermore, pyrolysis gas and char can be used to provide heat and generate electricity [6]. Several studies have been reported to use pyrolysis for fuel recovery from oily sludge.…”

Section: Introductionmentioning

confidence: 99%

Oily sludge catalytic pyrolysis combined with fine particle removal using a Ni-ceramic membrane

Gao

Quan

et al. 2020

Fuel

Pyrolysis is one of the effective technology for oily sludge treatment and energy recovery. However, pyrolysis of oily sludge generates solid particles which are taken away from the reactor by gas, causing blockage in downstream equipment and reducing the quality of pyrolysis oil and gas. A study on the clean catalytic pyrolysis of oily sludge was carried out, by incorporating a ceramic membrane with or without Ni inside the pyrolysis reactor. It aims to investigate the effect of ceramic membrane on oily sludge pyrolysis and particulate removal. The yield of the pyrolysis gas produced from the reaction with Ni-ceramic membrane is 31.46 L/kg, while the recovery rate of pyrolysis oil is 48.21%.On the contrary, the yield of the pyrolysis gas produced from the reaction with blank ceramic membrane is 17.92 L/kg, while the recovery rate of pyrolysis oil is 62.63%. The particulate matter content in gas without and with Ni-ceramic membrane are 2.74 and 0.07 mg/L. The particulate matter content in oil without and with Ni-ceramic membrane are 3708.9 and 156.7 mg/L, respectively. Results indicated that the Ni catalyst loading on the ceramic membrane could improve the yield of the pyrolysis gas and remove the fine particles effectively. In addition, a long-time catalytic pyrolysis experiment was carried out, with the feeding speed of 4.17 g/min and the reaction temperature of 500 o C. It was found from the set conditions that the Ni-ceramic membrane could be *Revised Manuscript clean and final version Click here to view linked References used continuously for 420 min.

Journal of Petroleum Science and Engineering

“…Approximately 60 million tons of oil sludge are accumulated by the petroleum industry each year worldwide (Hu et al, 2013); these sludges are considered to be the most substantial waste generated in this industry (Egazar'yants et al, 2015, Shen et al, 2016. In fact, it was estimated that more than one billion tons of the sludges have been stored around the world (Mirghaffari, 2017), which considerably affects the operation of the petroleum industry and have environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of oil sludges from different sources before treatment: High-field nuclear magnetic resonance (NMR) in the determination of oil and water content

Ramírez

Kowalczyk

Collins

2019

potentially toxic elements (PTEs) are believed to come from oil additives (de Souza et al., 2014).da Silva et al. (2012) reported that the composition of oil sludge is about 30 to 90% water, 4 to 7% sediments, and to 60% oil. However, Saikia et al. (2003) stated that the typical composition of oil sludge is 30-50% water, 10-12% sediments and solids, 30-50% oil. Yang et al. (2005), Zhang et al. (2012), and Long et al. (2013 have agreed that oil sludge is usually composed of 30-70% water, 2 to 15% sediments and solids, and 30-90% oil. Moreover, Egazar'yants et al. (2015) mentioned that oil sludges can have approximately 10 to 56 wt.% organic materials, 30 to 85 wt.% water and 1 to 46 wt.% solids or sediments. This shows that there is no uniform agreement among authors on the detailed oil sludge composition. This is not surprising since each oil sludge composition is unique, and depends on the origin of the oil sludge (Viana et al., 2015). Consequently, the physicochemical characteristics vary according to the nature of the oil (Oliveira et al., 2015) and the formation process and storage of the oil sludge (Kadiev et al., 2015). Generally, the sediment content is less than the oil and water contents. The oil usually had higher aliphatic hydrocarbon percentages (40-60%) than the aromatic hydrocarbon percentages (25-40%) (Shie et al., 2004, Speight, 2006. This wide variation in the composition of oil sludges has significant implications on the characterisation of oil sludges because different procedures and methods have been applied to study different types of sludges (Heidarzadeh et al., 2010, Wang et al., 2010, Zhang et al., 2011, Jasmine and Mukherji, 2015. In turn, this is extremely relevant for quick decision-making purposes regarding the appropriate treatment of this waste. Currently, the treatment of oil sludges is aimed to either reduce the contaminants in the sludge or to recover the oil. The former includes some methods such as encapsulation (Johnson et al., 2015), bioremediation (Wang et al., 2016, Roy et al., 2018), and incineration (Gong et al., 2017 whereas the latter, the oil recovery methods, include freeze/thawing (Hu et al., 2015), solvent extraction (Hu et al., 2017, * These elements are potentially toxic elements (PTEs) (Shaheen et al., 2016).Values in bold are over the limit of the acceptable standards of landfilling of hazardous waste established by the European Union: As (25 µg•g -1 ), Cd (5), Cr (70), Cu (100), Ni (40), Pb (50), Zn (200) (Kriipsalu et al., 2008). The mean values with the standard deviation (in parentheses) are shown (n = 3).