Effect of waste liquid produced from the hydrothermal treatment of both low-rank coal and sludge on the slurryability of coal sludge slurry

Liu, Meng; Duan, Yufeng; Bikane, Kagiso; Zhao, Liang

doi:10.1016/j.fuel.2017.04.091

Cited by 21 publications

(8 citation statements)

References 51 publications

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“…Varying pH of the hydrothermal medium has been shown to result in different reaction pathways being favored for biocrude formation . It should be noted that hydrothermal treatment of LP and the hydrothermal treatment of dairy manure had produced acidic process liquids as result of produced organic acids, while the hydrothermal treatment of digested wastewater sludge had become more basic. − This can further explain the more significant phenolic peak area present in the manure- or LP-containing runs, as furfural intermediates can degrade into phenols and furfural formation is more favored during acidic conditions . More HCs were detected for sludge/LP HTL runs than manure/LP HTL runs.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Liquefaction of Loblolly Pine: Effects of Various Wastes on Produced Biocrude

et al. 2018

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In this study, feedstock interaction of cow manure and digested sewage sludge on hydrothermal liquefaction (HTL) of loblolly pine (LP) was evaluated. Noncatalytic HTL experiments were performed at reaction temperatures of 250, 275, and 300 °C at a constant reaction time of 30 min. Cyclohexane and acetone were used for biocrude extraction separately. The study focuses on the characteristics of the produced biocrude, and thus, physicochemical properties of biocrudes were examined by gas chromatography–mass spectrometry, Fourier-transform infrared spectroscopy, density, and viscosity measurements, in addition to comparing mass and energy yields. On a LP basis, the biocrude yield reached as high as 30 and 17% for acetone and cyclohexane extraction, respectively, at the highest reaction temperature. Elemental carbon and energy contents increased with increasing HTL temperature for all cases. Alkalinity of the HTL process liquid (aqueous phase) increases from the HTL of sludge, and thus, it favored the formation of nonpolar compounds in biocrude. On the other hand, acidity of the reaction medium increases with the HTL of manure and pine, and thus, phenolic compounds in biocrude were increasing. Cyclohexane was more effective for sludge/LP biocrude extraction, whereas acetone was effective for manure/LP. Density of cyclohexane extracted sludge/LP biocrudes at 300 °C was less than 1000 kg m –3 , whereas acetone-extracted biocrudes had densities greater than 1000 kg m –3 . For all the biocrudes, viscosity was reduced considerably for the mixtures when compared to biocrudes from LP alone.

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Section: Resultsmentioning

confidence: 99%

Hydrothermal Liquefaction of Loblolly Pine: Effects of Various Wastes on Produced Biocrude

et al. 2018

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“…CWS must have good slurrying properties, specifically, high concentration (heat value) and low viscosity, to ensure the economic efficiency of CWS-based combustion and gasification. Several research papers have been published on the slurryability and rheology of coal slurries prepared with different types of wastewater−coal slurries, such as hydrothermal treatment waste liquid, 9 coal waste liquid, 10 gasification furnace wastewater, and secondary sedimentation tank wastewater. 11 Previous experiments have shown that slurrying is promoted by some types of wastewater, such as hydrothermal treatment waste liquid and coal waste liquid, but not by others, such as gasification furnace wastewater and secondary sedimentation tank wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Xie et al 12 pointed out that phenol in industrial wastewater could act as a surfactant to reduce the viscosity of CWS and that NH 4 + −N in waste liquids improved the stability of CWS. Liu et al 9 discovered that some small oxygencontaining organic compounds (methanol and acetic acid) that had adsorbed on coal surfaces acted as surfactants and improved slurryability. Zhang et al 13 found that the slurryability of CWS was negatively affected when the hydrophobic surfaces of coal particles became hydrophilic after the adsorption of small oxygen-containing organic molecules.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Surfactants on Coal Surfaces in the Coking Wastewater Environment: Kinetics and Effects on the Slurrying Properties of Coking Wastewater–Coal Slurry

Wang

Zhao

et al. 2019

Ind. Eng. Chem. Res.

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Coking wastewater, instead of clean water, is used to prepare coking wastewater–coal slurry (CWCS), which can be used as liquid fuel for combustion and gasification. Surfactant adsorption on coal surfaces affects the preparation and industrial application of coal slurry because it is essential for improving the surface wettability of coal. The study of the adsorption kinetics of surfactants on coal surfaces contributes to mastering the adsorption behavior of surfactants on coal surfaces. In this work, we focused on the influence of the internal components (phenol, quinoline, indole, NH4 +–N, and metal ions) of coking wastewater on the adsorption kinetics of surfactants on coal. Adsorption kinetics was determined by fitting the adsorption capacity of surfactants at different adsorption times with the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. Then, the effects of the internal components of coking wastewater on the slurrying characteristics of CWCS were analyzed. Results showed that adsorption closely followed the pseudo-second-order model and was controlled by the mechanisms of liquid membrane diffusion, surface adsorption, and intraparticle diffusion. The influences of various internal components of coking wastewater on the secondary adsorption rate k 2 likely remained unclear because the models cannot effectively address the competition and promotion effects between wastewater components and the surfactant. Organic and inorganic components increased surfactant adsorption on coal surfaces but exerted different influences on the slurryability and stability of the coal slurry. Specifically, organic components increased slurryability but slightly decreased stability, whereas inorganic components decreased slurryability but increased stability.

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“…It is common knowledge that UV spectra can display the features of unsaturated bonds information, such as for n–σ*, n–π*, and π–π*, qualitatively and quantitatively; 16 therefore, UV spectroscopic fingerprinting in combination with chemometric methods can be used for monitoring the TCM/HM quality in a straightforward, rapid, and effective manner. 17,18 In the past few years, UHPLC–ESI-Q-TOF-MS/MS, as a high resolution, excellent sensitivity, accurate mass measurement and high throughput technology, has been applied to integrate multi-constituent determination and fingerprint analysis for TCM/HM QC, 19 and could be of great importance for facilitating further investigation of the compatibility mechanisms.…”

Section: Introductionmentioning

confidence: 99%

UHPLC-ESI-Q-TOF-MS/MS analysis, antioxidant activity combined fingerprints for quality consistency evaluation of compound liquorice tablets

et al. 2018

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Effect of waste liquid produced from the hydrothermal treatment of both low-rank coal and sludge on the slurryability of coal sludge slurry

Cited by 21 publications

References 51 publications

Hydrothermal Liquefaction of Loblolly Pine: Effects of Various Wastes on Produced Biocrude

Hydrothermal Liquefaction of Loblolly Pine: Effects of Various Wastes on Produced Biocrude

Adsorption of Surfactants on Coal Surfaces in the Coking Wastewater Environment: Kinetics and Effects on the Slurrying Properties of Coking Wastewater–Coal Slurry

UHPLC-ESI-Q-TOF-MS/MS analysis, antioxidant activity combined fingerprints for quality consistency evaluation of compound liquorice tablets

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