Control of Several Emissions during Olive Pomace  Thermal Degradation

Waste production is increasing every day as a consequence of human activities; thus, its valorization is becoming more important. For this purpose, the usage of wastes as biofuels is one of the most important aspects of sustainable strategies. This is the case of the main waste generated in brewing industries: brewers’ spent grain (BSG). In this sector, microbreweries are not able to properly manage the wastes that they generate due to lack of space. Consequently, the transformation of BSG to a high-quality biofuel might be an interesting option for this kind of small industry. In this work, we carried out a physical-energy characterization of BSG, as well as pellets from this waste. The initial characterization showed slightly unfavorable results concerning N and ash, with values of 3.76% and 3.37% db, respectively. Nevertheless, the physical characterization of the pellets was very good, with acceptable bulk density (662.96 kg·m−3 wb) and low heating value (LHV; 17.65 MJ·kg−1 wb), among others. This situation is very favorable for any of the intended uses (for energy use or animal feed, among others).

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“…Similar profiles were found for agro-industrial wastes with comparable characteristics, such as olive pomace [61].…”

Section: Thermogravimetric Analysissupporting

confidence: 74%

Feasibility Analysis of Brewers’ Spent Grain for Energy Use: Waste and Experimental Pellets

et al. 2021

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“…However, according to the current emission regulations, the use of EOP as a renewable fuel poses problems due to particle emissions. Some of the most worrying emissions related to this biomass are aromatics compounds (benzene, toluene, or phenol), sulphur, chlorine compounds, dioxins and furans, which are considered dangerous to both the environment and human health [ 7 ]. Therefore, the search for alternative uses for this agro-industrial waste is of great interest [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Valorisation of Exhausted Olive Pomace by an Eco-Friendly Solvent Extraction Process of Natural Antioxidants

et al. 2020

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Exhausted olive pomace (EOP) is the waste generated from the drying and subsequent extraction of residual oil from the olive pomace. In this work, the effect of different aqueous solvents on the recovery of antioxidant compounds from this lignocellulosic biomass was assessed. Water extraction was selected as the best option for recovering bioactive compounds from EOP, and the influence of the main operational parameters involved in the extraction was evaluated by response surface methodology. Aqueous extraction of EOP under optimised conditions (10% solids, 85 ºC, and 90 min) yielded an extract with concentrations (per g EOP) of phenolic compounds and flavonoids of 44.5 mg gallic acid equivalent and 114.9 mg rutin equivalent, respectively. Hydroxytyrosol was identified as the major phenolic compound in EOP aqueous extracts. Moreover, these extracts showed high antioxidant activity, as well as moderate bactericidal action against some food-borne pathogens. In general, these results indicate the great potential of EOP as a source of bioactive compounds, with potential uses in several industrial applications.

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“…Additionally, TGA/DSC equipment can be coupled with other instruments that identify released gasses and their chemical composition. As result, emissions and evolved pollution during the process can be quantified and managed [25][26][27].…”

Section: Methods Of Thermal Processes Analysismentioning

confidence: 99%

Carbonized Solid Fuel Production from Polylactic Acid and Paper Waste Due to Torrefaction

2021

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The quantity of biodegradable plastics is increasing steadily and taking a larger share in the residual waste stream. As the calorific value of biodegradable plastic is almost two-fold lower than that of conventional ones, its increasing quantity decreases the overall calorific value of municipal solid waste and refuse-derived fuel which is used as feedstock for cement and incineration plants. For that reason, in this work, the torrefaction of biodegradable waste, polylactic acid (PLA), and paper was performed for carbonized solid fuel (CSF) production. In this work, we determined the process yields, fuel properties, process kinetics, theoretical energy, and mass balance. We show that the calorific value of PLA cannot be improved by torrefaction, and that the process cannot be self-sufficient, while the calorific value of paper can be improved up to 10% by the same process. Moreover, the thermogravimetric analysis revealed that PLA decomposes in one stage at ~290–400 °C with a maximum peak at 367 °C, following a 0.42 reaction order with the activation energy of 160.05 kJ·(mol·K)−1.

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Control of Several Emissions during Olive Pomace Thermal Degradation

Cited by 17 publications

References 25 publications

Feasibility Analysis of Brewers’ Spent Grain for Energy Use: Waste and Experimental Pellets

Feasibility Analysis of Brewers’ Spent Grain for Energy Use: Waste and Experimental Pellets

Valorisation of Exhausted Olive Pomace by an Eco-Friendly Solvent Extraction Process of Natural Antioxidants

Carbonized Solid Fuel Production from Polylactic Acid and Paper Waste Due to Torrefaction

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