Removing Organic Compounds from Oily Sludge

Jing, Guolin; Luan, Mingming; Kong, Lingrong; Han, Chunjie

doi:10.1260/0958-305x.23.5.771

Cited by 2 publications

(2 citation statements)

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“…Increasing temperature not only yields and produces higher COD removal ratios but also achieves faster degradation of organic compounds. This is because higher temperature increases the rate constant of the radicals, enhancing their reaction with organic compounds towards degradation [20][21][22]. At 200 • C and 3.4 MPa, the oxidation caused desorption of the residual bitumen that was stuck to soil particles, releasing trapped water and a layer of bitumen froth on top of the water layer (Figure S2).…”

Section: Discussionmentioning

confidence: 99%

“…WAO can treat a variety of contaminants at the same time, and the destruction of pollutants takes place in the liquid phase, thus reducing any air pollutants. This technology is well-suited for wastewaters with suspended solids that are too diluted for incineration and not biodegradable, such as sludge wastes [19] including oily sludges [20][21][22]. Additionally, WAO has also previously been applied to the treatment of a variety of industrial wastewaters including those of pulp and paper [23], dyes [24], pharmaceuticals [25], olive oil mills [26], and the petrochemical industry [27] as well as phenol and its derivatives [28].…”

Section: Introductionmentioning

confidence: 99%

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Treatment of Oil Sands’ Mature Fine Tailings Using Advanced Wet Air Oxidation (WAO) and Wet Air Peroxide Oxidation (WAPO)

Khan

Elnakar

2022

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Mature Fine Tailings (MFT) generated from oil sands processing represent a growing environmental issue, as settling of these tailings’ emulsion can take decades, increasing the risk of the toxic material’s leaching if left untreated. This study uses advanced wet air oxidation (WAO) and wet air peroxide oxidation (WAPO) to break down the MFT emulsions for faster settling. Three oxidation time intervals (5, 15, and 30 min) were investigated using compressed air and hydrogen peroxide in a pressurized vessel of 3.1–3.4 MPa internal pressure and at 200 °C temperature. The results showed that the WAO process was able to break the MFT emulsion, release trapped water, and recover residual bitumen. The WAPO process was much faster in breaking the emulsion; however, the presence of extra oxidants also resulted in the degradation of the residual bitumen. The 5 min oxidation time interval was found to be sufficient in breaking emulsions, separating water from soil particles, and recovering residual bitumen under the tested conditions. The oxidation process proved to be efficient by degrading all inorganic carbon, whereas 70% of the dissolved organic carbon in the recovered water after oxidation comprised only low molecular weight biodegradable hydrocarbons. Therefore, the WAO process was capable of breaking the MFT emulsions and allowing a faster settling of these tailings, with the added benefit of recovering residual bitumen.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treatment of Oil Sands’ Mature Fine Tailings Using Advanced Wet Air Oxidation (WAO) and Wet Air Peroxide Oxidation (WAPO)

Khan

Elnakar

2022

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A Resource-Oriented Method of Oily Sludge Disposal in ASP Flooding Production

Wang

Rui²,

Lin

et al. 2017

Day 2 Tue, October 10, 2017

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In the field practice of alkaline/surfactant/polymer (ASP) flooding, there is more oily sludge produced and accumulated in settling tank, dehydrater, recycling pool, etc. Timely and effective disposal of oily sludge has already played an indispensable role in establishing the surface and subsurface integration pattern with chemicals EOR. Many conventional disposal methods faced to the challenges of separation efficiency, facilities pollution, healthy and environmental threats, and economical justification with the appearance of alkali, surfactant and polymer in produced liquid (mixture of oil and water of wells). We focus on using physical comprehensive effects to remove the emulsified oil and absorbed water, and the in-situ utilization of the left sludge was regarded as a method development to address the challenges recently. A laboratory investigation of characterizing the properties of oily sludge in ASP flooding production was recently carried out. The heating-washing-centrifuging combination treatment process was practiced. After removing its emulsified oil and absorbed water, the sludge transported to filter bed to form a suspended sludge blanket was studied and the feasibility of in-situ utilization of filtering separated water was also evaluated. The application effects of the resource-oriented disposal method were assessed, and the integration technology and operation parameters were designed and optimized. The results indicate that the oily sludge with ASP flooding is characterized by high caloric value, high water cut, high viscosity, strong electronegativity and stability, and there is relatively high melting temperature, more wax and asphaltenes in oil phase. There appears to be a linear relationship between the scale of oily sludge deposition in surface facilities and the appearance concentration of chemicals in produced liquid of production wells. Compared with the previous thermochemistry demulsification disposal methods, dirty oil recovery ratio increased more than 15%, and running expense was reduced around 20%. The dirty oil content in the sludge was less than 2% when disposed under the combination disposal process and operation parameters. Furthermore, the formed suspended sludge blanket has the functions of in-situ purification of separated water, achieving the cyclic utilization in washing process. The probable impacts of its direct discharge into the normal sewage treatment system reduced and secondary pollution decreased spontaneously. This study is beneficial to provide a robust and potential way for disposing oily sludge in the production and operation of chemicals EOR, and it is also significant to understand the surface and subsurface integration idea and further accelerating ASP flooding application in high water cut oilfields.

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Removing Organic Compounds from Oily Sludge

Cited by 2 publications

References 37 publications

Treatment of Oil Sands’ Mature Fine Tailings Using Advanced Wet Air Oxidation (WAO) and Wet Air Peroxide Oxidation (WAPO)

Treatment of Oil Sands’ Mature Fine Tailings Using Advanced Wet Air Oxidation (WAO) and Wet Air Peroxide Oxidation (WAPO)

A Resource-Oriented Method of Oily Sludge Disposal in ASP Flooding Production

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