A proposal for the classification of sludge products throughout hydrothermal treatment

Pola, Lucía; Collado, Sergio; Oulego, Paula; Dı́az, Mario

doi:10.1016/j.cej.2021.132746

Cited by 15 publications

(1 citation statement)

References 43 publications

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“…Hydrothermal treatment is considered as an environmentally benign option as it uses high-pressure and sub-supercritical water for the material treatment. It eliminates the need for additional chemicals by using water as the reaction catalyst/solvent and has primarily been used for sewage treatment and the separation and classification of valuable materials. , Furthermore, various studies investigating the impact of hydrothermal treatment on the cellulose structure have been undertaken. According to Kim et al, the commencement of hydrothermal decomposition for cellulose begins at 200–220 °C, and Kang et al confirmed the presence of microspheres on the cellulose surface after hydrothermal treatment .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Aramid–Cellulose Nanofiber Films with Improved Mechanical and Dielectric Properties Utilizing Environmentally Friendly Hydrothermal Treatment for Electrical Insulation

Sankhla

Nath

Neogi

2023

ACS Sustainable Chem. Eng.

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Finding long-term solutions to environmental issues like resource depletion and pollution is crucial. Hence, in this research, the authors prepare nanocomposite films of sustainable materials, cellulose nanofiber (CNF) and aramid nanofiber (ANF) films, using the hydrothermal method, which is an environmentally friendly approach. The effect of treatment temperature on the surface functionality, crystallinity, thermal behavior, and morphology of nanocomposite films is investigated. This analysis contributed to the conclusion that the mechanical strength of the nanocomposite films is improved due to the existence of hydrogen bonds between the nanofibers and enhanced ANF fibrillation. The tensile strength and tensile modulus increased by 123 and 24%, respectively. Furthermore, in contrast to the brittle pristine ANF and CNF films, the nanocomposite films are extremely flexible, with a total elongation that is more than 3.5 times higher. An examination of the films’ dielectric properties showed a rise in the dielectric strength of more than 55%, with a minimal dielectric loss. As a result, the ANF/CNF nanocomposite films produced by hydrothermal treatment can be efficiently used for high-strength insulating applications.

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Section: Introductionmentioning

confidence: 99%

Preparation of Aramid–Cellulose Nanofiber Films with Improved Mechanical and Dielectric Properties Utilizing Environmentally Friendly Hydrothermal Treatment for Electrical Insulation

Sankhla

Nath

Neogi

2023

ACS Sustainable Chem. Eng.

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Optimization of a pre-concentration method for the analysis of mercury isotopes in low-concentration foliar samples

Ali,

Božič,

Vijayakumaran Nair

et al. 2024

Anal Bioanal Chem

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Hg isotope analysis in samples from background regions is constrained by the presence of low Hg concentration and therefore requires a pre-concentration method. Existing Hg pre-concentration methods are constrained by long sample processing time and limited sample loading capacity. Using foliar samples as a test case, an optimized Hg pre-concentration method is presented that involves the microwave-assisted digestion of samples for Hg isotope analysis with the addition of a pre-digestion step. Microwave-digested foliar samples and CRMs were transferred to an impinger, reduced with SnCl2, and collected in a 2.25 mL concentrated inverse aqua regia (3:1 HNO3:HCl, v/v). This resulted in an optimal acid concentration in the solution ideal for analysis on MC-ICP-MS. The time for purging with Hg-free N2 was optimized to 30 min and the efficiency of the pre-concentration method was tested using a combination of approaches. Tests performed on pure reagents and matrix of foliar samples spiked with 197Hg radiotracer showed recoveries averaging 99 ± 1.7% and 100 ± 3.0%, respectively. Mercury at concentrations as low as 1.83 ng g−1 was pre-concentrated by digesting aliquots of foliage samples in individual digestion vessels. Recoveries following their pre-concentration averaged 99 ± 6.0%, whereas recoveries of 95 ± 4.7% and 95 ± 2.5% were achieved for NIST SRM 1575a (pine needle) and reagents spiked with NIST SRM 3133, respectively. Analysis using multicollector-ICP-MS showed low fractionation of δ202Hg during sample pre-concentration with no significant mass-independent fractionation. The proposed method is a relatively simple and robust way to prepare Hg samples for Hg isotopic analysis and is suitable even for complex biological matrices. Graphical abstract

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Synergistic treatment of sewage sludge and food waste digestate residues for efficient energy recovery and biochar preparation by hydrothermal pretreatment, anaerobic digestion, and pyrolysis

Li,

Wang,

Xie

et al. 2024

Applied Energy

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A proposal for the classification of sludge products throughout hydrothermal treatment

Cited by 15 publications

References 43 publications

Preparation of Aramid–Cellulose Nanofiber Films with Improved Mechanical and Dielectric Properties Utilizing Environmentally Friendly Hydrothermal Treatment for Electrical Insulation

Preparation of Aramid–Cellulose Nanofiber Films with Improved Mechanical and Dielectric Properties Utilizing Environmentally Friendly Hydrothermal Treatment for Electrical Insulation

Optimization of a pre-concentration method for the analysis of mercury isotopes in low-concentration foliar samples

Synergistic treatment of sewage sludge and food waste digestate residues for efficient energy recovery and biochar preparation by hydrothermal pretreatment, anaerobic digestion, and pyrolysis

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