Mechanism of separation and removal of water from oily sludge using liquid dimethyl ether to dissolve hydrocarbons

Mu, Biao; Wang, Zhu; Zhong, Jun; Le, Chen; Lin, Naixi; Wang, Chenyu; Chen, Sipeng; Li, Zhuo

doi:10.1016/j.chemosphere.2021.130452

Cited by 28 publications

(12 citation statements)

References 44 publications

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“…An ideal DR value and extraction efficiency of OM can be obtained at MR = 20, where the used L-DME can be recovered by repressurization after separation . However, the solvent amount may impact the extensive scale application.…”

Section: Resultsmentioning

confidence: 99%

“…An ideal DR value and extraction efficiency of OM can be obtained at MR = 20, where the used L-DME can be recovered by repressurization after separation. 11 However, the solvent amount may impact the extensive scale application. Reducing the amount of L-DME used in the process is beneficial toward shrinking the batch reactor size, as well as reducing the overall investment required to cover equipment costs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Previously, L-DME has been used in the advanced dehydration of sewage sludge 10 and oily sludge. 11 The results indicated that L-DME can dissolve the hydrophilic organic compounds in sludge and, thus, break down the structure of water-in-oil emulsions. Therefore, the bound water that is not easily removed via mechanical means can be converted into free water and, thus, achieve a high degree of separation of water from different types of sludge.…”

Section: ■ Introductionmentioning

confidence: 96%

“…Because of these above-mentioned characteristics, L-DME can be applied to wet feedstock dehydration. Previously, L-DME has been used in the advanced dehydration of sewage sludge and oily sludge . The results indicated that L-DME can dissolve the hydrophilic organic compounds in sludge and, thus, break down the structure of water-in-oil emulsions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Study of Salvaged Cyanobacteria Slurry Treatment Using Liquefied Dimethyl Ether: Dehydration and Organic Matter Extraction

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Liquefied dimethyl ether (L-DME) was used to dehydrate salvaged cyanobacteria slurry (SCS) and extract its organic matter. The dehydration rate and organic matter extraction efficiency were determined by mixing L-DME with SCS in a sealed reactor for 0–25 min, and the amount of solvent was 6–39 times that of SCS at a stirring rate of 0–800 rpm. Free water in SCS was removed entirely at an L-DME amount of 9 times, and then bound water was gradually removed with an increase in L-DME dosage, with a final SCS lowest moisture content of 16.64% at an L-DME amount of 39 times. Moreover, L-DME extracted 8.72%–21.15% of the organic matter from SCS, with almost complete lipid extraction. The phosphorus and nitrogen were also extracted because they mainly exist in phospholipids and proteins. Subsequently, the solid residue and liquid product were characterized, with fatty acids and plasticizers found in the liquid product. The dehydration rate and organic matter extraction efficiency were also investigated using ethanol as adjuvant of L-DME, with ethanol serving as an adjuvant. The performance of dehydration and organic matter extraction from SCS using L-DME was evaluated to explore the feasibility of applying this process to SCS treatment.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Study of Salvaged Cyanobacteria Slurry Treatment Using Liquefied Dimethyl Ether: Dehydration and Organic Matter Extraction

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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“…A large amount of oily sludge has been produced in the process of crude oil exploration, production, transportation, storage and refining [1]. Oily sludge has become a serious environmental problem in many countries.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Prediction on the Effect of Ionic Properties of Solvent Extraction Performance of Oily Sludge Using Machine Learning

Zhu

et al. 2021

Molecules

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Oily sludge produced in the process of petroleum exploitation and utilization is a kind of hazardous waste that needs to be urgently dealt with in the petrochemical industry. The oil content of oily sludge is generally between 15–50% and has a great potential for oil resource utilization. However, its composition is complex, in which asphaltene is of high viscosity and difficult to separate. In this study, The oily sludge was extracted with toluene as solvent, supplemented by three kinds of ionic liquids (1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM] [BF4]), 1-ethyl-3-methylimidazole trifluoro-acetate ([EMIM] [TA]), 1-ethyl-3-methylimidazole Dicyandiamide ([EMIM] [N(CN)2])) and three kinds of deep eutectic solutions (choline chloride/urea (ChCl/U), choline chloride / ethylene glycol (ChCl/EG), and choline chloride/malonic acid (ChCl/MA)). This experiment investigates the effect of physicochemical properties of the solvents on oil recovery and three machine learning methods (ridge regression, multilayer perceptron, and support vector regression) are used to predict the association between them. Depending on the linear correlation of variables, it is found that the conductivity of ionic liquid is the key characteristic affecting the extraction treatment in this system.

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Novel conditioner for efficient dewaterability and modification of oily sludge with high water content

Liu

Song

2021

Environ Sci Pollut Res

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The Oily sludge with high water content (OS) was dewatered, modi ed and converted into solid fuel by a novel chemical conditioner . The effect of OSO-101 dosage on the dewaterability of OS was studied, showing that OSO-101 dosage of 15% (wt.) could achieve the best dewaterability e ciency of OS (98.18%). Meanwhile, compared with some conventional conditioners, OSO-101 developed by our team was more effective in improving OS dewaterability e ciency. And OSO-101 may have free radical reaction, polar reaction and redox reaction with petroleum hydrocarbons in OS, thereby polymerizing and forming condensed solid structures. The calori c value change of OS after conditioning, heavy metal content and dioxins content of y ash leached from incinerated product were measured for resource analysis and environmental assessment. Results showed that the resultant OS fuel blocks had extremely low content of heavy metals, dioxins and other toxic and hazardous substances leached from y ash, thereby no secondary treatment and fully meeting environmental protection emission standards.Additionally, OSO-101 had certain economic rationality, and could effectively recover the calori c value contained in OS. This research is expected to provide new insights for e cient dewaterability and modi cation of OS, as well as subsequent resource utilization and harmless treatment, bringing potential environmental and economic bene ts. Highlights(1) OS was dewatered, conditioned and converted into solid fuel by OSO-101.(2) The dewaterability e ciency of OS was 98.18% with the addition of 15 wt.% OSO-101.(3) OSO-101 can increase calori c value of OS and improve feasibility for fuel utilization.

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Mechanism of separation and removal of water from oily sludge using liquid dimethyl ether to dissolve hydrocarbons

Cited by 28 publications

References 44 publications

A Study of Salvaged Cyanobacteria Slurry Treatment Using Liquefied Dimethyl Ether: Dehydration and Organic Matter Extraction

A Study of Salvaged Cyanobacteria Slurry Treatment Using Liquefied Dimethyl Ether: Dehydration and Organic Matter Extraction

Evaluation and Prediction on the Effect of Ionic Properties of Solvent Extraction Performance of Oily Sludge Using Machine Learning

Novel conditioner for efficient dewaterability and modification of oily sludge with high water content

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