Evaluation of the applicability of selected analytical techniques for determining the characteristics of humic substances sourced from by-products of the wastewater treatment process

Michalska, Justyna; Turek–Szytow, Jolanta; Dudło, Agnieszka; Kowalska, ­Katarzyna­; Surmacz-Górska, Joanna

doi:10.1016/j.scitotenv.2023.164237

Cited by 11 publications

(5 citation statements)

References 107 publications

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“…However, in Figure A,B, which presented, respectively, the spectra of HSs isolated from lignite and peat, the characteristic inflection was observed at approximately 280 nm. This signal is characteristic for the CO chromophores of the fulvic fraction . It corresponds to the composition of these samples.…”

Section: Resultsmentioning

confidence: 92%

“…This signal is characteristic for the C=O chromophores of the fulvic fraction. 47 It corresponds to the composition of these samples. In the case of humic extracts, whose spectra are presented in Figure 5 A,B, the fraction of humates and humic acids was not separated by lowering the pH of the liquid phase after extraction, and therefore, the fulvic fraction was presented in these samples.…”

Section: Resultsmentioning

confidence: 99%

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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: 92%

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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“…A Varian Cary 50 spectrophotometer (Specord 50 Plus, Analytik Jena, Jena, Germany) operating in the 300 nm to 700 nm wavelength range was used to measure the UV-Vis spectra. According to Michalska et al [10], UV-Vis spectroscopy may be recognised as a cost-effective approach for the preliminary characterisation of HSs [10].…”

Section: Components Of Humus-isolation Of Fa and Ha Fractionsmentioning

confidence: 99%

“…In adsorbing heavy metals and creating stable complexes with humic substances, organic additions like composts and peat, which have a high proportion of humified organic matter (OM) [9], might reduce the bioaccessibility of heavy metals in soil. One of the most common, omnipresent, and reactive elements of biological matter in nature is humic substance (HS) [10]. Some toxic elements that are fundamentally soluble and changeable can be immobilised by adding humic compounds and can profoundly affect the environmental behaviour of metals.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Soil Humic Substances, Textural Fractions on the Sorption of Heavy Metals (Cd, Pb)

Feszterová,

Kowalska,

Hudec

2024

Applied Sciences

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This study examined the sorption of heavy metals in selected soils (e.g., Andosol, Cambisol, Planosol) in Slovakia, focusing on the kind and quantity of humic materials as well as the soil’s characteristics. Heavy metals were detected using GT AAS, while UV-Vis spectroscopy was used to determine humic substances’ colour quotients. The impact of the total organic carbon on the total cadmium, bioavailable lead, and cadmium was highlighted. The results reveal positive correlations among humic substances and bioavailable forms of Cd (r = 0.692) and Pb (r = 0.709). A relationship was discovered between FAs and the bioavailable forms of Pb (r = 0.743) and Cd (r = 0.700) and between the level of HSs and the bioavailable content of Cd (r = 0.499). Bioavailable heavy metals showed a positive correlation with clay fraction and a negative correlation with heavy metal content. Correlations were found between the bioavailable heavy metal forms and the colour quotients of humic substances and humic acids. Heavy metals in bioavailable forms decreased with the levels of the condensation and dispersion of humic substances. From clay to silt, the amounts of Cd and Pb increased. This study’ results provide insights into the relationships between soil properties, humic substances, and the sorption of the studied elements.

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“…MSS is an important source of HSs. Their occurrence, characterization, and yields depend mainly on the type of MSS (e.g., untreated, composted, or digested) [48]. Raw MSS may contain humus-like materials because, during municipal wastewater treatment, the OM mineralization is accompanied or closely followed by humification, making MSS rich in intermediate products of decomposition, mostly "raw" humus.…”

Section: Hs Contents In Raw and Processed Mssmentioning

confidence: 99%

Municipal Sewage Sludge as a Resource in the Circular Economy

Gusiatin,

Kulikowska,

Bernat

2024

Energies

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Municipal sewage sludge (MSS) is an inevitable byproduct of wastewater treatment, with increasing amounts year by year worldwide. The development of environmentally and economically acceptable methods for the sustainable management of MSS is a major environmental challenge. Nowadays, sludge management practices, besides the commonly used stabilization methods, focus attention on alternative sludge-disposal pathways, which encompass enhanced energy and valuable-resource recovery. This review presents the recent advances in the recovery of selected value-added products from sludge. Because of the high nitrogen and phosphorus concentrations, waste MSS can be a nutrient source (e.g., struvite). This paper discusses the conditions of and advances in the technology of struvite recovery. As in the extracellular polymeric substances (EPSs) of biological sludge, alginate-like exopolymers (ALEs) are present in MSS systems that treat municipal wastewater. The yields, dynamics in content, and characterization of ALEs and their possible applications were analyzed. MSS is an important source of humic substances. Their occurrence, characterization, and yields in various types of MSS (e.g., untreated, composted, and digested sludge) and main methods of application are presented. The important aspects and trends of MSS pyrolysis, including the thermochemical conversion to biochar, are discussed in this review. The characterization of biochar derived from MSS and the assessment of the environmental risks are also covered. This paper explores the potential use of biochar derived from MSS in various applications, including soil amendment, carbon sequestration, and environmental remediation.

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Evaluation of the applicability of selected analytical techniques for determining the characteristics of humic substances sourced from by-products of the wastewater treatment process

Cited by 11 publications

References 107 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

Assessing the Impact of Soil Humic Substances, Textural Fractions on the Sorption of Heavy Metals (Cd, Pb)

Municipal Sewage Sludge as a Resource in the Circular Economy

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