Solid separation from the heavy oil sludge produced from Liaohe Oilfield

Duan, Ming; Li, Chengcheng; Wang, Xiaodong; Fang, Shenwen; Xiong, Yan; Shi, Peng

doi:10.1016/j.petrol.2018.09.019

Cited by 25 publications

(6 citation statements)

References 19 publications

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“…4b and c ). This event could be due to a strong W/O emulsion present in these sludges, where the solids can be either absorbed in the interface and/or dispersed in the oil and water parts of the emulsion (Duan et al 2019 ). Therefore, the top layer was left further overnight to ensure complete gravitational separation of the water and sediment traces.…”

Section: Resultsmentioning

confidence: 99%

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Ramírez

Shaw

Collins

2020

Environ Sci Pollut Res

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Different physicochemical and biological treatments have been used to treat oil sludges, and oil recovery techniques are preferred such as oil sludge washing (OSW) with surfactants and co-solvents. Toluene is commonly used as co-solvent, but it is non-benign to the environment. This study tested alternative co-solvents (n-pentane, n-hexane, cyclohexane, and isooctane) at 1:1 and 2:1 C/OS (co-solvent to oil sludge ratio). Also, this study evaluated the effect on the oil recovery rate (ORR) of three main parameters in the washing: type, concentration, and application ratio (S/OS) of surfactants to oil sludges. To date, no study has assessed these parameters in the washing of oil sludges from different sources. Four types of oil sludges and five surfactants (Triton X-100 and X-114, Tween 80, sodium dodecyl sulphate (SDS), and rhamnolipid) were used. The results showed that cyclohexane had high ORR and could be used instead of toluene because it is more benign to the environment. The S/OS ratio had a high effect on the ORR and depended on the type of oil sludge. Rhamnolipid, Triton X-100, and Triton X-114 had the highest oil recovery rates (40 – 70%). In addition, it was found that the surfactant concentration had no effect on the ORR. Consequently, the addition of surfactant was not significantly different compared to the washing with no surfactants, except for one sludge. The use of the surfactant in the washing solution can help in the selective extraction of specific oil hydrocarbon fractions in the recovered oil to assess its potential reuse as fuel. Further recommendations were given to improve the OSW process.

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Section: Resultsmentioning

confidence: 99%

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Ramírez

Shaw

Collins

2020

Environ Sci Pollut Res

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“…The Liaohe Estuarine Wetland (LEW) is an important crab breeding area and also a reused oil extraction area. In recent years, aquaculture and oil exploration have led to excessive emissions of ammonia nitrogen (NH 4 + -N) and severe petroleum pollution in wetland water systems, resulting in damage to the living environment of river crabs and affecting the ecological environment of wetlands [2]. Therefore, it is particularly important to control the concentrations of NH 4 + -N and petroleum hydrocarbons (PHCs) in wetlands.…”

Section: Introductionmentioning

confidence: 99%

Biochar/Clay Composite Particle Immobilized Compound Bacteria: Preparation, Collaborative Degradation Performance and Environmental Tolerance

Sun

Wei

Gao

et al. 2023

Water

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Immobilized microbial materials can effectively remove pollutants from surface water, and a biochar/clay composite particle (BCCP) material is prepared with immobilized Flavobacterium mizutaii sp. and Aquamicrobium sp. to remove ammonia nitrogen (NH4+–N) and petroleum hydrocarbons (PHCs). The results indicated that the optimal ratios of biochar, Na2SiO3 and NaHCO3 were 15%, 3%, and 3%, and the adsorption process was found to be better described with the pseudo-second-order kinetic equation. The individual immobilization of Flavobacterium mizutaii sp. and Aquamicrobium sp. with sodium alginate–polyvinyl alcohol (PVA + SA) achieved 80% and 90% removal efficiencies for NH4+–N and PHCs at the 10th d. The composite immobilization of two efficient bacteria could degrade 82.48% NH4+–N and 74.62% PHCs. In addition, immobilization relieved the effects of temperature and salinity. This study can provide guidance for the application of immobilized microbial composite materials in natural water environments.

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“…At present, technologies such as solvent extraction, conditioning-mechanical separation, incineration, ultrasonic radiation, pyrolysis, electrolytic air flotation, and chemical cleaning are commonly used to treat oily sludge. 5 The process of chemically cleaning sludge is to make the surfactant act on the sludge interface through the action mechanism of the cleaning agent’s adsorption, emulsification, and dissolution and the interaction between the surfactant chain containing ester groups and the oil leads to surface activity. 6 The adsorption of the agent on the oil surface reduces the interfacial tension of the oil-cement and the contact force of the oil sludge, quickly strips the oil from the oil sludge, and realizes the three-phase separation.…”

Section: Introductionmentioning

confidence: 99%

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

et al. 2021

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This paper reported a new oily sludge compound cleaning agent formula, which used a combination of molecular simulation and experimental methods to study its interfacial formation energy (IFE), and exciting results were obtained. From a total of 24 surfactants in five categories, sodium silicate (Na 2 SiO 3 ), sodium dodecylbenzene sulfonate, and fatty alcohol polyoxyethylene polyoxypropylene ether (JFC-SF) were screened out because of their excellent washing oil effect. Under a reasonable orthogonal system, when the mass ratio of the three surfactants was 3:1:1, the oil desorption effect was the best, the oil residual rate could reach 2.13%, and the oil removal efficiency could reach 93.53%. Verified by the molecular dynamics simulation module, the absolute value of the interface binding energy was the largest at this compound ratio, which was 465.71 kcal/mol. More importantly, we have discussed in depth the mechanism of adsorption and permeation of oily sludge by cleaning agents. Through single-factor influence experiments, the following optimized working condition parameters of the cleaning agent were determined: cleaning conditions with an agent content of 4%, a temperature of 70 °C, a stirring speed of 400 rpm, a cleaning time of 30 min, and a liquid–solid ratio (L/S) of 4:1. The research results laid the foundation for resource utilization, harmlessness, and reduction of oily sludge in the Liaohe oilfield.

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Solid separation from the heavy oil sludge produced from Liaohe Oilfield

Cited by 25 publications

References 19 publications

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Biochar/Clay Composite Particle Immobilized Compound Bacteria: Preparation, Collaborative Degradation Performance and Environmental Tolerance

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

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