Emission characteristics of nitrogen and sulfur containing pollutants during the pyrolysis of oily sludge with and without catalysis

Liu, Wujun; Shao, Zhihong; Xu, Yu

doi:10.1016/j.jhazmat.2020.123820

Cited by 57 publications

(20 citation statements)

References 44 publications

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“…The gas was continuously released at temperatures between 280 and 420 °C. The results proved that the original OS contained a large amount of alkanes, and PAHs, and a small amount of sulfur and amines [ 64 ]. The SO 2 peak disappeared after thermal washing.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4d shows that the original OS produced H 2 O (3900-3400 cm −1 , 1960-1400 cm −1 ), CO 2 (3359 cm −1 , 2300 cm −1 , 660 cm −1 ), SO 2 (1373 cm −1 , 1327 cm −1 ), CO (2239 cm −1 , 2197 cm −1 ), NH 3 (960 cm −1 , 927 cm −1 ), and the stretching vibration of the C-H bond of alkanes (2930 cm −1 and 2855 cm −1 ) after pyrolysis for 20 min (300 • C). The gas was continuously released at temperatures between 280 and 420 • C. The results proved that the original OS contained a large amount of alkanes, and PAHs, and a small amount of sulfur and amines [64]. The SO 2 peak disappeared after thermal washing.…”

Section: Change Of Composition Of Phcs From the Oily Sludgementioning

confidence: 89%

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Efficient Separation and Recovery of Petroleum Hydrocarbon from Oily Sludge by a Combination of Adsorption and Demulsification

Yao

Liu

et al. 2022

IJMS

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The treatment of oily sludge (OS) can not only effectively solve environmental pollution but also contribute to the efficient use of energy. In this study, the separation effect of OS was analyzed through sodium lignosulfonate (SL)-assisted sodium persulfate (S/D) treatment. The effects of SL concentration, pH, temperature, solid–liquid ratio, revolving speed, and time on SL adsorption solubilization were analyzed. The effects of sodium persulfate dosage, demulsification temperature, and demulsification time on sodium persulfate oxidative demulsification were analyzed. The oil removal efficiency was as high as 91.28%. The results showed that the sediment was uniformly and finely distributed in the S/D-treated OS. The contact angle of the sediment surface was 40°, and the initial apparent viscosity of the OS was 56 Pa·s. First, the saturated hydrocarbons and aromatic hydrocarbons on the sediment surface were adsorbed by the monolayer adsorption on SL. Stubborn, cohesive oil agglomerates were dissociated. Sulfate radical anion (SO4−·) with a high oxidation potential, was formed from sodium persulfate. The oxidation reaction occurred between SO4−· and polycyclic aromatic hydrocarbons. A good three-phase separation effect was attained. The oil recovery reached 89.65%. This provides theoretical support for the efficient clean separation of oily sludge.

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Section: Resultsmentioning

confidence: 99%

Section: Change Of Composition Of Phcs From the Oily Sludgementioning

confidence: 89%

Efficient Separation and Recovery of Petroleum Hydrocarbon from Oily Sludge by a Combination of Adsorption and Demulsification

Yao

Liu

et al. 2022

IJMS

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“…The HCN releases at approximately 390 °C were associated with the thermal degradation of nitrile-N (e.g., C 7 H 5 N and C 4 H 2 N 2 ) or cyclic-N components (e.g., C 9 H 7 N and C 5 H 6 N 2 ) that formed from the dehydrogenation and polymerization of amine-N components in PC/TA, and the HCN releases at approximately 700 °C could be related to the secondary thermal cracking of protein-N components in PC (Figure S8 and Table S6). 4,49,58 The onset and predominant releases of NH 3 could probably be ascribed to the thermal decomposition of amine-N and protein-N components, respectively. 52,59 Moreover, significant releases of HCNO and NO were also observed at approximately 390 °C, which were related to the thermal degradation of nitrile-N groups and the reaction of N-containing compounds with OH radicals.…”

Section: Osmentioning

confidence: 99%

Heterogeneous Dynamic Behavior and Synergetic Evolution Mechanism of Internal Components and Released Gases during the Pyrolysis of Aquatic Biomass

Song

et al. 2022

Environ. Sci. Technol.

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Evolution of gaseous contaminants from biomass pyrolysis has drawn increasing attention. However, the thermal degradation, dynamics, and synergetic evolution mechanisms during real-time biomass pyrolysis remain unclear. Herein, a novel method using thermogravimetry−Fourier transform infrared spectrometry−gas chromatography/mass spectrometry (TG− FTIR−GC/MS) combined with thermal kinetics and two-dimensional correlation spectroscopy was proposed to explore the chemical properties and temperature response mechanisms of gaseous species released during Phragmites communis (PC) and Typha angustifolia (TA) pyrolysis. The thermal degradation mechanisms of PC/TA pyrolysis were mainly associated with the sigmoidal rate and random nucleation mechanisms. The formation intensities of alcohols/ethers, phenols/esters, acids, aldehydes, and ketones were higher during low-temperature TA pyrolysis and high-temperature PC pyrolysis. The average carbon oxidation state (OS C ) of gaseous species mainly ranged from −1.5 to −0.5, and the OS C slope of most gaseous species was greater than −2.0, which was related to the reduction of aldehyde/ketone groups. Two-dimensional (2D)-TG− FTIR−COS analysis revealed that the sequential temperature response of gaseous species followed: acids → phenols, esters → aldehydes → hydrocarbons → alcohols, ethers → aromatics during PC/TA pyrolysis. The establishment of relationships between the sequential response of gases and degraded components provides an important basis for online monitoring/recovery of gaseous contaminants during biomass pyrolysis.

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“…Thus, the heating temperature has a great influence on the distribution and yield of the pyrolysis product. Presently, research studies on OS pyrolysis mainly focus on the relationship between the pyrolysis procedure and the corresponding product, − while the discussion on the pyrolysis mechanism and kinetics of OS is relatively less. It is also found that at lower heating rates (10, 20 K/min), the rate had little effect on the gas-phase yield, while at a higher rate (100 K/min), some volatile compounds would be released from OS immediately, greatly increasing the gas-phase yield …”

Section: Introductionmentioning

confidence: 99%

Functional Group Characteristics and Pyrolysis/Combustion Performance of Karamay OS Based on FT-IR and TG–DTG Analyses

Shan

et al. 2021

ACS Omega

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Proximate analysis, ultimate analysis, Fourier-transform infrared spectroscopy (FT-IR), and thermogravimetry−differential thermal analysis characterization were carried out on oily sludge (OS) samples OS1−OS5, from Karamay, Xinjiang, China. The Coast− Redfern model (CRm) was used to simulate the pyrolysis and combustion kinetics of oily samples. The results showed that the peak area percentage of benzene ring trisubstitution of OS5, in the range of 700−900 cm −1 , is close to 75%, corresponding to its high volatile content. Based on the kinetic analysis by the CRm, it is found that the fitting degree of the five samples is better when the reaction order is selected as n = 2, with R 2 close to 1.00 and 2RT/E to 0. Among them, the S N and D W of OS5 are 17.8 × 10 −10 % 2 min −2 °C−3 and 0.10899 × 10 −5 % min −1 °C−2 , respectively, higher than those of other samples, indicating a good combustion performance.

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Emission characteristics of nitrogen and sulfur containing pollutants during the pyrolysis of oily sludge with and without catalysis

Cited by 57 publications

References 44 publications

Efficient Separation and Recovery of Petroleum Hydrocarbon from Oily Sludge by a Combination of Adsorption and Demulsification

Efficient Separation and Recovery of Petroleum Hydrocarbon from Oily Sludge by a Combination of Adsorption and Demulsification

Heterogeneous Dynamic Behavior and Synergetic Evolution Mechanism of Internal Components and Released Gases during the Pyrolysis of Aquatic Biomass

Functional Group Characteristics and Pyrolysis/Combustion Performance of Karamay OS Based on FT-IR and TG–DTG Analyses

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