Characterisation of humic substances formed during co-composting of grass and wood wastes with animal grease

Bikovens, Oskars; Dizhbite, Tatiana; Телышева, Галина

doi:10.1080/09593330.2011.632652

Cited by 20 publications

(6 citation statements)

References 19 publications

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“…FA and HA were mainly composed of carbon and oxygen elements. The carbon and oxygen contents of FA were 28.99% and 65.37%, respectively, while those of HA were 50.98% and 38.88%, which were consistent with the elemental analysis ratio of HA reported in the previous literature [ 28 , 29 ].…”

Section: Resultssupporting

confidence: 91%

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Chen

Zhuang

et al. 2022

IJERPH

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In this study, Baoqing lignite (BL) and rice straw (RS), which were the representatives of low-rank coal and biomass, were co-thermally oxidized to produce composite humic substances (HS), including humic acid (HA) and fulvic acid (FA). Taking HS content as the output response, the co-thermally oxidizing conditions were optimized through single factor experiment and response surface methodology (RSM). The structures of HA and FA prepared under optimized conditions were analyzed by SEM, UV, and FTIR. Results showed that HS content was clearly influenced by the material ratio, oxidation time, and oxidation temperature, as well as their interactions. The optimized co-thermal oxidization condition was as follows: BL and RS pretreated with a material ratio of 0.53, oxidation time of 59.50 min, and oxidation temperature of 75.63 °C. Through verification, the experimental value (62.37%) had a small relative error compared to the predicted value (62.27%), which indicated that the developed models were fit and accurate. The obtained HA had a tightly packed block structure; FA had a loosely spherical shape. The molecular weight of FA was 2487 Da and HA was 20904 Da; both had a smaller molecular weight than that reported in other literature. FA showed strong bands at 1720 cm−1, thus confirming the presence of more oxygen-containing functional groups. The appearance of double peaks at 2900~2980 cm−1 indicated that HA contains more aliphatic chains. The co-thermal oxidation of BL and RS gives a new method for the synthesis of HS, and the optimization of co-thermal oxidation conditions will provide fundamental information for the industrialization of composite HS.

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Section: Resultssupporting

confidence: 91%

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Chen

Zhuang

et al. 2022

IJERPH

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“…In all cases, media contained glucose as carbon source (56 mM). Defined media consisted of KH 2 PO 4 , 0.2 g/L; MgSO 4 . 7H 2 O, 0.05 g/L; CaCl 2 , 0.01 g/L and trace element solution, 1 mL/L [18].…”

Section: Defined Mediamentioning

confidence: 99%

“…Humic substances (HS) are the products of decomposition of plants and animal tissues, although they are much more stable than their precursors [1,4]. HS are formed when organic matter is decomposed in a process called humification.…”

Section: Introductionmentioning

confidence: 99%

Fungal treatment of humic-rich industrial wastewater: application of white rot fungi in remediation of food-processing wastewater

Zahmatkesh

Spanjers

Lier

2017

Environmental Technology

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This paper presents the results of fungal treatment of a real industrial wastewater (WW), providing insight into the main mechanisms involved and clarifying some ambiguities and uncertainties in the previous reports. In this regard, the mycoremediation potentials of four strains of white rot fungi (WRF): Phanerochaete chrysosporium, Trametes versicolor, Pleurotus ostreatus and Pleurotus pulmonarius were tested to remove humic acids (HA) from a real humic-rich industrial treated WW of a food-processing plant. The HA removal was assessed by color measurement and size-exclusion chromatography (SEC) analysis. T. versicolor showed the best decolorization efficiency of 90% and yielded more than 45% degradation of HA, which was the highest among the tested fungal strains. The nitrogen limitation was studied and results showed that it affected the fungal extracellular laccase and manganese peroxidase (MnP) activities. The results of the SEC analysis revealed that the mechanism of HA removal by WRF involves degradation of large HA molecules to smaller molecules, conversion of HA to fulvic acid-like molecules and also biosorption of HA by fungal mycelia. The effect of HS on the growth of WRF was investigated and results showed that the inhibition or stimulation of growth differs among the fungal strains.

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“…The characteristics of the output product are strongly affected by the quality of the incoming products and the techniques used for composting. Wastes from pruning, grass cuttings and leaves are the most valuable fractions in the co-composting process [22]. The high C/N ratio makes it advisable to compost waste containing a high concentration of nitrogen as sewage sludge.…”

Section: Co-composting Of Organic and Green Waste From Gardensmentioning

confidence: 99%

Management of Municipal Solid Waste in One of the Galapagos Islands

2016

Solid Waste Management

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This paper analyses some aspects of the management of municipal solid waste in one of the islands of the Galapagos archipelago. The aim is to point out a few aspects of an interesting experience that could help decision managers faced with the organization of the waste sector in similar realities. The relevance of this case study consists in the presence of a very famous National Park surrounding the inhabited area. The role of tourism in the generation of waste is analyzed too.

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Characterisation of humic substances formed during co-composting of grass and wood wastes with animal grease

Cited by 20 publications

References 19 publications

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Fungal treatment of humic-rich industrial wastewater: application of white rot fungi in remediation of food-processing wastewater

Management of Municipal Solid Waste in One of the Galapagos Islands

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