Influential Factors in Fermentation of Refinery Oily Sludge

Zhang, Xiuxia; Wang, Jicheng; Zhang, Yunbo; Liu, Qiyou; Geng, Chunxiang; Lu, Jun

doi:10.1021/ie061380l

Cited by 7 publications

(7 citation statements)

References 5 publications

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“…Many disposal methods for OS have been developed over the years, including solidification, solvent extraction, bioremediation, incineration, pyrolysis, ultrasonic, supercritical water, synergistic treatment of wastes, etc. − However, most of these methods find it difficult to achieve further industrial applications. Among these methods, incineration has great potential to become an efficient large-scale OS treatment technology due to its remarkable advantages of fast processing speed, significant reduction in waste volume, and heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Study on the Migration Characteristics of Sulfur and Nitrogen during Combustion of Oil Sludge with CaO Additive

et al. 2020

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Oil sludge (OS) is a typical hazardous waste from the petrochemical industry. Currently, the increasing ratio of highsulfur crude oil worldwide that results in the growth production of OS with high sulfur content has drawn much attention. OS incineration with calcium-based additives has great potential to be an efficient and clean approach for the large-scale treatment of high-sulfur-containing OS. In this work, the migration characteristics of sulfur and nitrogen during OS combustion with CaO additives were investigated by an online thermogravimetric-mass spectroscopy-Fourier transform infrared (TG-MS-FTIR) spectroscopy system and a fluidized combustion reactor system, respectively. Results indicated that CaO significantly reduced the emissions of SO 2 and NO x during fluidized combustion of OS, and the minerals in OS and CO 2 in the flue gas affected the utilization efficiency of CaO additive. The sulfur fixation capacity by CaO decreased with the increase of combustion temperature and almost completely failed at 1100 °C. The capacity of CaO to reduce NO x emission increased first followed by a decrease with the increase of combustion temperature. Furthermore, CaO significantly promoted the conversion of HCN to other nitrogen-containing gases, which can promote the production of NO by the precursors (HCN and NH 3 ) and the reduction reaction of NO to N 2 . To the best of our knowledge, there is still not an efficient and clean technology for large-scale treatment of OS in China. This study is helpful for the massive utilization of high-sulfur-containing OS.

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Section: Introductionmentioning

confidence: 99%

Study on the Migration Characteristics of Sulfur and Nitrogen during Combustion of Oil Sludge with CaO Additive

et al. 2020

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“…With the continuing depletion of energy resources and concerns over secondary pollution, oil recovery from oily sludge generated in the petroleum processing operations, including production, transportation, storage, and refining, has received more and more attention. , In China, the production of oily sludge is estimated at 3 million ton per annum . The sludge contains high concentrations of petroleum hydrocarbons and various recalcitrant components. , Therefore, it has been recognized as a hazardous waste in many countries. Its improper disposal has serious threats to the surrounding environments and human health .…”

Section: Introductionmentioning

confidence: 99%

“…3 The sludge contains high concentrations of petroleum hydrocarbons and various recalcitrant components. 4,5 Therefore, it has been recognized as a hazardous waste in many countries. Its improper disposal has serious threats to the surrounding environments and human health.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Dewatering and Recovering Oil from High-Viscosity Oily Sludge through the Combination Process of Demulsification, Viscosity Reduction, and Centrifugation

et al. 2017

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Continuing depletion of energy resources and concerns over secondary pollution have driven interests in dewatering and recovering oil from oily sludge generated in the numerous petroleum processing operations, such as production, transportation, storage, and refining. The high viscosity and emulsified water droplets in the sludge have significant impact on the dewatering efficiency and deoiling efficiency, as well as recovered oil quality. In this study, a combination process of demulsification, viscosity reduction, and centrifugation was proposed for dewatering and recovering oil from high-viscosity oily sludge. Based on its rheological properties, two solvents for viscosity reduction and three demulsifiers were examined. According to the degree of viscosity reduction, the naphtha named 120# solvent oil was selected as suitable solvent. The polyether demulsifier P9935 was identified in terms of its dewatering efficiency. Following the addition of the naphtha and demulsifier P9935, both centrifugation speed and centrifugation duration could significantly increase the deoiling efficiency and dewatering efficiency. There existed an optimum demulsification duration of 120 min to reduce the interfacial tension and thus increase the dewatering efficiency by 12.01%. The highest value of recovered oil quality and dewatering efficiency could be achieved at the demulsifier concentration of 0.3% with the increasing softness of asphaltenes films. As the dosage of demulsifier solution rose, the dewatering efficiency increased and the recovered oil quality became better. In general, the combination process is effective for dewatering and oil recovery from high-viscosity oily sludge.

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“…3 Petroleum sludge contains high concentrations of petroleum hydrocarbons (PHCs) and various recalcitrant components, such as emulsified water and fine solid particles, heavy metals, and other impurities. 4,5 Improper disposal of petroleum sludge can cause serious threats to the surrounding environment and inflict health risks to local residents because of the PHCs and heavy metal contents. 6 Therefore, in many countries, it is classified as a hazardous waste under current environmental regulations.…”

Section: ■ Introductionmentioning

confidence: 99%

Migration of Emulsified Water Droplets in Petroleum Sludge during Centrifugation

et al. 2014

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Centrifugation is an efficient and environmentally friendly method to recover valuable oil resources from petroleum sludge. In this paper, the Monte Carlo method was used to predict the settling behavior of different-sized water droplets, based on the Navier-Stokes equation. Differential scanning calorimetry (DSC) was used to deduce the size distribution of emulsified water droplets in petroleum sludge.Numerical estimation and experimental analysis both show that the water removal rate increases with rising centrifugal speed. When the centrifugal speed increased from 2000 to 10,000 rpm, the water removal rate increased from 28% to 99%.Meanwhile, the critical separation size of emulsified water droplet decreased from over 14 µm at 2000 rpm to around 3 µm at 10,000 rpm. The Monte Carlo method was successfully applied to assess the effect of petroleum viscosity and centrifugal speed on the water removal rate and the simulations are in good agreement with DSC analysis. The results of this study can provide quantitative information and guidance for optimizing the centrifugation of petroleum sludge for oil recovery.

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Influential Factors in Fermentation of Refinery Oily Sludge

Cited by 7 publications

References 5 publications

Study on the Migration Characteristics of Sulfur and Nitrogen during Combustion of Oil Sludge with CaO Additive

Study on the Migration Characteristics of Sulfur and Nitrogen during Combustion of Oil Sludge with CaO Additive

Simultaneous Dewatering and Recovering Oil from High-Viscosity Oily Sludge through the Combination Process of Demulsification, Viscosity Reduction, and Centrifugation

Migration of Emulsified Water Droplets in Petroleum Sludge during Centrifugation

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