Oxidation-alkaline-enhanced abiotic humification valorizes lignin-rich biogas digestate into artificial humic acids

Sarlaki, Ehsan; Ghofrani-Isfahani, Parisa; Ghorbani, Marzieh; Benedini, Lidia; Kermani, Ali-mashaallah; Rezaei, Meisam; Marzban, Nader; Filonenko, Svitlana; Peng, Wanxi; Tabatabaei, Meisam; He, Yifeng; Aghbashlo, Mortaza; Kianmehr, Mohammad Hossein; Angelidaki, Irini

doi:10.1016/j.jclepro.2023.140409

Cited by 10 publications

(6 citation statements)

References 75 publications

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“…The spectral ratios for the tested humic samples were calculated and interpreted according to Sarlaki et al and Boguta et al , The indexes given in Table refer to the wavelengths at which the absorbance data were collected. Generally, due to the information provided, the values of the determined ratios were interpreted in two groups.…”

Section: Resultsmentioning

confidence: 99%

Application of Alkaline Deep Eutectic Solvents as a Green Alternative to the Traditional Extractants for the Isolation of Humic Substances

Nieweś,

Marecka,

Huculak-Mączka

2024

ACS Omega

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The presented study focused on the possibility of using alkaline deep eutectic solvents (ADESs) as green extractants for the isolation of humic substances (HSs) from peat and lignite in a process intensified by ultrasound. For this purpose, the extraction procedure was statistically described on the basis of the Box−Behnken design, and the carboxyl group content in the obtained products was optimized due to the ADES composition, ultrasound intensity, and extraction time. For optimal extraction conditions, the experimental carboxyl content in the isolated products was equal to 3.71 and 2.96 mmol g −1 for the HSs extracted from peat and lignite, respectively. These values were similar to the results for the reference samples, which were HSs extracted using 0.1 M NaOH, as well as humic acids and sodium humates purchased from Sigma-Aldrich. The qualitative assessment of the products obtained was based on spectroscopic methods, including FTIR, 1 H NMR, and UV−vis. The analyses carried out for the isolated samples revealed the characteristic structures of HSs, including components of aliphatic chains and aromatic core as well as carboxyl, ester, and amino groups. Simultaneously, the results of the spectral ratio of E 280 /E 472 showed the significant differences between the relative amount of lignin for the samples tested.

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Section: Resultsmentioning

confidence: 99%

Application of Alkaline Deep Eutectic Solvents as a Green Alternative to the Traditional Extractants for the Isolation of Humic Substances

Nieweś,

Marecka,

Huculak-Mączka

2024

ACS Omega

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“…Similarly, the E 4 /E 6 ratio in the Gly0.24 treatment experienced a sharp decrease from 5.25 to 2.42 during the 0~28 h time frame, followed by irregular fluctuations and ultimately dropping to 2.32. These E 4 /E 6 ratios were much higher than those of artificial humic acids (HAs) from the abiotic humification of lignin-rich biogas, where the E 4 /E 6 ratio was only 0.43 [17]. Although the E 4 /E 6 ratios of the supernatant fluid decreased after the polyphenol-Maillard reaction and the structural condensation of HLA was enhanced, the degree of humification was lower than that of HAs from the abiotic humification of lignin-rich biogas.…”

Section: E 4 /E 6 Ratio and Total Organic C (Toc) Of The Supernatant ...mentioning

confidence: 87%

“…The polyphenol-Maillard reaction was the main contributor to HA polymerization [32]. The presence of gibbsite (Al 3+ ), known for its Lewis acid properties, served to enhance the yield of HLA [17]. The increase in the C HLA /C FLA ratio more accurately indicated the shift from FLA to HLA, which exhibited a higher degree of condensation, thereby enhancing the quality of the HLSs [9].…”

Section: Discussionmentioning

confidence: 99%

Changes in the Glucose Concentration Affect the Formation of Humic-like Substances in Polyphenol–Maillard Reactions Involving Gibbsite

Wang,

Cui,

Zhou

et al. 2024

Molecules

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The polyphenol–Maillard reaction is considered one of the important pathways in the formation of humic-like substances (HLSs). Glucose serves as a microbial energy source that drives the humification process. However, the effects of changes in glucose, particularly its concentration, on abiotic pathways remain unclear. Given that the polyphenol–Maillard reaction requires high precursor concentrations and elevated temperatures (which are not present in soil), gibbsite was used as a catalyst to overcome energetic barriers. Catechol and glycine were introduced in fixed concentrations into a phosphate-buffered solution containing gibbsite using the liquid shake-flask incubation method, while the concentration of glucose was controlled in a sterile incubation system. The supernatant fluid and HLS components were dynamically extracted over a period of 360 h for analysis, thus revealing the influence of different glucose concentrations on abiotic humification pathways. The results showed the following: (1) The addition of glucose led to a higher degree of aromatic condensation in the supernatant fluid. In contrast, the supernatant fluid without glucose (Glu0) and the control group without any Maillard precursor (CK control group) exhibited lower degrees of aromatic condensation. Although the total organic C (TOC) content in the supernatant fluid decreased in all treatments during the incubation period, the addition of Maillard precursors effectively mitigated the decreasing trend of TOC content. (2) While the C content of humic-like acid (CHLA) and the CHLA/CFLA ratio (the ratio of humic-like acid to fulvic-like acid) showed varying increases after incubation, the addition of Maillard precursors resulted in a more noticeable increase in CHLA content and the CHLA/CFLA ratio compared to the CK control group. This indicated that more FLA was converted into HLA, which exhibited a higher degree of condensation and humification, thus improving the quality of HLS. The addition of glycine and catechol without glucose or with a glucose concentration of 0.06 mol/L was particularly beneficial in enhancing the degree of HLA humification. Furthermore, the presence of glycine and catechol, as well as higher concentrations of glucose, promoted the production of N-containing compounds in HLA. (3) The presence of Maillard precursors enhanced the stretching vibration of the hydroxyl group (–OH) of HLA. After the polyphenol–Maillard reaction of glycine and catechol with glucose concentrations of 0, 0.03, 0.06, 0.12, or 0.24 mol/L, the aromatic C structure in HLA products increased, while the carboxyl group decreased. The presence of Maillard precursors facilitated the accumulation of polysaccharides in HLA with higher glucose concentrations, ultimately promoting the formation of Al–O bonds. However, the quantities of phenolic groups and phenols in HLA decreased to varying extents.

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“…HTC operates at milder temperature and pressure conditions (180-260 • C and 20-50 bar), HTL at intermediate operating conditions (240-375 • C and 50-250 bar), and HTG at more severe conditions, above supercritical conditions of water (T > 380 • C and P > 250 bar) [7]. Additionally, recent advancements in HTPs include hydrothermal humification (HTH) and hydrothermal fulvification (HTF), defined based on the pH of the solution due to the presence of alkaline agents (e.g., KOH) [8][9][10][11][12]. Due to the wide range of combinations of operative conditions, the field of applications is even wider.…”

Section: Hydrothermal Carbonizationmentioning

confidence: 99%

Business and Market Analysis of Hydrothermal Carbonization Process: Roadmap toward Implementation

Farru,

Scheufele,

Moloeznik Paniagua

et al. 2024

Agronomy

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This study assesses the status of hydrothermal carbonization (HTC) technology and identifies barriers hindering its commercial viability. Conducting a global survey among HTC companies (with a total of 24 surveys sent), the research evaluates the current landscape, challenges, and future prospects of large-scale HTC operations. Furthermore, it presents a detailed global inventory of existing HTC facilities, illustrating geographical distribution and trends in application. Most of the companies are located in Europe, followed by Asia and North America. With substantial participation from HTC companies, exceeding 62% in the survey (15 companies), the study provides a comprehensive overview of diverse companies, their business models, regulatory challenges, and the overall state of HTC technology. The majority of companies in this study, approximately 80%, offer services in the field of waste management. This paper also explores the potential of HTC in transforming waste management practices, carbon sequestration methodologies, and the development of new materials. Employing a thorough SWOT analysis, the paper advocates for a broader adoption of HTC, emphasizing its transformative capacity in fostering sustainable management of urban, industrial, and agricultural residues, promoting circular economy principles, mitigating climate change, and offering a robust foundation for informed decision-making and sustainable development strategies.

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Oxidation-alkaline-enhanced abiotic humification valorizes lignin-rich biogas digestate into artificial humic acids

Cited by 10 publications

References 75 publications

Application of Alkaline Deep Eutectic Solvents as a Green Alternative to the Traditional Extractants for the Isolation of Humic Substances

Application of Alkaline Deep Eutectic Solvents as a Green Alternative to the Traditional Extractants for the Isolation of Humic Substances

Changes in the Glucose Concentration Affect the Formation of Humic-like Substances in Polyphenol–Maillard Reactions Involving Gibbsite

Business and Market Analysis of Hydrothermal Carbonization Process: Roadmap toward Implementation

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