Hydrothermal carbonization of oily sludge for solid fuel recovery – investigation of chemical characteristics and combustion behaviour

Pauline, A. Leena; Joseph, Kurian

doi:10.1016/j.jaap.2021.105235

Cited by 31 publications

(7 citation statements)

References 54 publications

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“…nitrogen, also appear [24]. Pauline and Joseph [25] applied HTC technology to the oily sludge of a refinery in India. The results show that the structure of the oily sludge was destroyed after dehydration, decarboxylation, and the condensation reaction, and finally, coke with an energy recovery rate of 75.7%-78.9% was obtained, and the obtained coke was rich in linear long chain alkane (C7-C20).…”

Section: Hydrothermal Carbonmentioning

confidence: 99%

Catalyzed hydrothermal treatment of oily sludge: A review

Zhang,

et al. 2024

Clean Energy Sci. Technol.

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Oily sludge is a common by-product of the petroleum exploration industry, which is rich in resources and has strong toxicity. It is categorized as hazardous waste in many nations worldwide. Owing to the distinct physical and chemical characteristics of sub/supercritical water, the application of hydrothermal conversion technology, which uses sub/supercritical water as a medium, has been growing in the utilization of resources and the safe disposal of oily sludge. In this article, the research on the oxygen-free hydrothermal transformation of oil sludge, including hydrothermal carbonization, hydrothermal liquefaction, hydrothermal upgrading, and supercritical water gasification, is reviewed. Due to the significant impact of nitrogenous and sulfurous compounds in sludge on hydrothermal conversion products, the hydrogenation conversion, reaction path, and kinetics for these two compounds were discussed. Finally, a summary and comparison of the studies conducted on carriers and catalysts in hydrothermal processes are provided. This review can offer recommendations for future studies, as well as guidance for the hydrothermal catalytic treatment of oily sludge.

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Section: Hydrothermal Carbonmentioning

confidence: 99%

Catalyzed hydrothermal treatment of oily sludge: A review

Zhang,

et al. 2024

Clean Energy Sci. Technol.

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“…It is known that sewage sludge contains different types of pathogens, including eggs of parasitic worms, bacteria and viruses. AD is one of the effective methods for the reduction in pathogens to allow the safe application of digested sludge for agriculture [4]. However, depending on the temperature regime, the results of hygienisation may vary: after MAD, the digestate did not meet the requirements that would permit to apply the digestate as a fertilizer to soil; meanwhile, after TAD, the digestate possessed higher pathogenic safety results [52].…”

Section: Hygienisation Efficiency Assessmentmentioning

confidence: 99%

“…Hence, the sludge is converted into energy, nutrients, and other valuable substances (metals, specific organic substances). All of the above mentioned can be reused in different spheres of our life, including agriculture (fertilizers), various industries (biopolymers, fuels) and communal services (heat) [2][3][4]. By this, lower emissions of pollutants to the environment are reached [5].…”

Section: Introductionmentioning

confidence: 99%

Digested Sludge Quality in Mesophilic, Thermophilic and Temperature-Phased Anaerobic Digestion Systems

Lanko

Hejnic

Ambrožová

et al. 2021

Water

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Anaerobic digestion (AD) technology is commonly used to treat sewage sludge from activated sludge systems, meanwhile alleviating the energy demand (and costs) for wastewater treatment. Most often, anaerobic digestion is run in single-stage systems under mesophilic conditions, as this temperature regime is considered to be more stable than the thermophilic one. However, it is known that thermophilic conditions are advantageous over mesophilic ones in terms of methane production and digestate hygienisation, while it is unclear which one is better concerning the digestate dewaterability. Temperature-phased anaerobic digestion (TPAD) is a double-stage AD process that combines the above-mentioned temperature regimes, by operating a thermophilic digester followed by a mesophilic one. The aim of this study is to compare the digestate quality of single-stage mesophilic and thermophilic AD and TPAD systems, in terms of the dewaterability, pathogenic safety and lower calorific value (LCV) and, based on the comparison, consider digested sludge final disposal alternatives. The research is conducted in lab-scale reactors treating waste-activated sludge. The dewaterability is tested by two methods, namely, centrifugation and mechanical pressing. The experimental results show that the TPAD system is the most beneficial in terms of organic matter degradation efficiency (32.4% against 27.2 for TAD and 26.0 for MAD), producing a digestate with a high dewaterability (8.1–9.8% worse than for TAD and 6.2–12.0% better than for MAD) and pathogenic safety (coliforms and Escherichia coli were not detected, and Clostridium perfringens were counted up to 4.8–4.9 × 103, when for TAD it was only 1.4–2.5 × 103, and for MAD it was 1.3–1.8 × 104), with the lowest LCV (19.2% against 15.4% and 15.8% under thermophilic and mesophilic conditions, respectively). Regarding the final disposal, the digested sludge after TAD can be applied directly in agriculture; after TPAD, it can be used as a fertilizer only in the case where the fermenter HRT assures the pathogenic safety. The MAD digestate is the best for being used as a fuel preserving a higher portion of organic matter, not transforming into biogas during AD.

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“…The hydrothermal carbon produced is widely used for the adsorption and removal of pollutants [ 10 , 11 , 12 ]. The hydrothermal carbonization process involves the dehydration and decarboxylation of functional groups, resulting in increased carbon content and density, as well as enhanced adsorption properties [ 13 ]. At the same time, hydrothermal carbon has been shown to display high adsorption characteristics for lead and arsenic [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

The Adsorption of Pb(II) from Aqueous Solution Using KOH-Modified Banana Peel Hydrothermal Carbon: Adsorption Properties and Mechanistic Studies

Bai,

Zhao,

Tian

et al. 2024

Materials

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Adopting banana peel as a raw material, the adsorption properties of banana peel hydrothermal carbon modified with a KOH solution for lead ions in aqueous solution were studied. The surface structure and functional groups of the modified hydrothermal carbon were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, the Brunner–Emmet–Teller (BET) method, element analysis, and Raman spectroscopy. The results showed that an adsorption capacity of 42.92 mg/g and a removal rate of 86.84% were achieved when the banana peel hydrothermal carbon was modified with a KOH solution of 0.5 mol/L, with a pH of 6 and a solid–liquid ratio of 1 g/L. The equilibrium adsorption time for lead ions in solution being adsorbed using KOH-modified hydrothermal carbon was 240 min, the adsorption process satisfied the quasi-second-order kinetic model and the Redlich–Peterson isotherm equation, and the equilibrium removal efficiency was 88.62%. The adsorption of lead ions using KOH-modified hydrothermal carbon is mainly chemical–physical adsorption.

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Hydrothermal carbonization of oily sludge for solid fuel recovery – investigation of chemical characteristics and combustion behaviour

Cited by 31 publications

References 54 publications

Catalyzed hydrothermal treatment of oily sludge: A review

Catalyzed hydrothermal treatment of oily sludge: A review

Digested Sludge Quality in Mesophilic, Thermophilic and Temperature-Phased Anaerobic Digestion Systems

The Adsorption of Pb(II) from Aqueous Solution Using KOH-Modified Banana Peel Hydrothermal Carbon: Adsorption Properties and Mechanistic Studies

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