Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Fernández-Rodríguez, M. J.; Lama-Calvente, D. de la; Jiménez‐Rodríguez, Antonia; Pino‐Mejías, Rafael; Borja, R.; Rincón, B.

doi:10.1007/s13399-020-00759-1

Cited by 10 publications

(15 citation statements)

References 58 publications

(75 reference statements)

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“…Autoclaving pretreatment resulted in a 14% improvement over untreated corn stover. Similar results were reported by Fernández-Rodríguez et al (2020) An improvement of 12.6% in biogas production from the autoclaved OMSW was reported.…”

Section: Methane Yieldsupporting

confidence: 90%

“…Pretreatment is an important step in the conversion of lignocellulosic biomass into biogas through anaerobic digestion. The main objective of the pretreatment is to break down the lignocellulose structure, reducing its size and exposing a larger surface area ( Fernández-Rodríguez et al, 2020 ). This can be done by chemical or physical modification of the biomass structure.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation and modelling of methane production from corn stover pretreated with various physicochemical techniques

Fernández-Rodríguez

Mushtaq

et al. 2021

Waste Manag Res

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Lignocellulosic by-products from agricultural crops represent an important raw material for anaerobic digestion and clean renewable, which is a key component of the circular economy. Lignocellulose is recalcitrant to biodegradation and pretreatments are required to increase methane yield during anaerobic digestion. In this work, the efficacy of different physicochemical pretreatments was compared using corn stover biomass as substrate. Anaerobic digestion of untreated and pretreated corn stover was performed in batch mode at mesophilic temperature (38°C) and organic matter solubilization of pretreated substrates was also investigated. The highest organic matter solubilization occurred in autoclave pretreatment (soluble chemical oxygen demand = 5630 ± 42 mg O2 L−1). However, the highest methane yield was obtained using alkaline pretreatment (367 ± 35 mL CH4 g−1 VSadded). Alkaline pretreatment increased methane yield by 43.3% compared to untreated control (256 ± 15 mL CH4 g−1 VSadded). Two mathematical models (i.e. first-order kinetics and transfer function) were utilized to fit the experimental data with the aim of assessing anaerobic biodegradation and to obtain the kinetic constants in all cases studied. Both models adequately fit the experimental results. The kinetic constant, k, of the first-order model increased by 92.8% when stover was pretreated with sulphuric acid compared with control. The transfer function model revealed that the maximum methane production rate, Rm, was obtained for the sulphuric acid treatment, which was 63.5% higher compared to control.

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Section: Methane Yieldsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Evaluation and modelling of methane production from corn stover pretreated with various physicochemical techniques

Fernández-Rodríguez

Mushtaq

et al. 2021

Waste Manag Res

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“…In previous biomethanization studies, the high nitrogen content of the macroalgae was indicated as one of the main factors that inhibit methane production (Costa et al 2012). Co-digestion would not only help to balance the C/N ratio, but it also helps to dilute the presence of toxins and inhibitory substances for the anaerobic digestion process, such as salt, in the case of macroalgae and phenols and lignocellulosic material for the OMSW (Fernández-Rodríguez et al 2020).…”

Section: Discussionmentioning

confidence: 99%

“…In this sense, R. okamurae, as nitrogen-rich biomass (C/N around 10:1-15:1, Geider and La Roche 2002), could potentially be used in AD as a co-substrate for C-rich by-products. One of these by-products could be the olive mill solid waste (OMSW), the main solid by-product generated in the process of producing olive oil by centrifugation in two phases, which is a mixture of olive pulp, skin, and pit (Fernández-Rodríguez et al 2020). This by-product has a high organic content and its treatment and management represents an important environmental problem.…”

Section: Introductionmentioning

confidence: 99%

Enhancing methane production from the invasive macroalga Rugulopteryx okamurae through anaerobic co-digestion with olive mill solid waste: process performance and kinetic analysis

et al. 2021

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The biomass valorisation of the invasive brown alga Rugulopteryx okamurae (Dictyotales, Phaeophyceae) is key to curbing the expansion of this invasive macroalga which is generating tonnes of biomass on southern Spain beaches. As a feasible alternative for the biomass management, anaerobic co-digestion is proposed in this study. Although the anaerobic digestion of macroalgae barely produced 177 mL of CH4 g−1 VS, the co-digestion with a C-rich substrate, such as the olive mill solid waste (OMSW, the main waste derived from the two-phase olive oil manufacturing process), improved the anaerobic digestion process. The mixture improved not only the methane yield, but also its biodegradability. The highest biodegradability was found in the mixture 1 R. okamurae—1 OMSW, which improved the biodegradability of the macroalgae by 12.9% and 38.1% for the OMSW. The highest methane yield was observed for the mixture 1 R. okamurae—3 OMSW, improving the methane production of macroalgae alone by 157% and the OMSW methane production by 8.6%. Two mathematical models were used to fit the experimental data of methane production time with the aim of assessing the processes and obtaining the kinetic constants of the anaerobic co-digestion of different combination of R. okamurae and OMSW and both substrates independently. First-order kinetic and the transference function models allowed for appropriately fitting the experimental results of methane production with digestion time. The specific rate constant, k (first-order model) for the mixture 1 R. okamurae- 1.5 OMSW, was 5.1 and 1.3 times higher than that obtained for the mono-digestion of single OMSW and the macroalga, respectively. In the same way, the transference function model revealed that the maximum methane production rate (Rmax) was also found for the mixture 1 R. okamurae—1.5 OMSW (30.4 mL CH4 g−1 VS day−1), which was 1.6 and 2.2 times higher than the corresponding to the mono-digestions of the single OMSW and sole R. okamurae (18.9 and 13.6 mL CH4 g−1 VS day−1), respectively.

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“…The pre-treatment at 121 ºC and 1.1 bars during 30 min was chosen based on previous results obtained from different soft hydrothermal pre-treatments carried out on OMSW (Fernández-Rodríguez et al, 2020). 500 g of OMSW were introduced into a 1L autoclaved bottle and then it was autoclaved under the conditions selected.…”

Section: Substrates and Inoculummentioning

confidence: 99%

Evolution of control parameters in biochemical methane potential tests of olive mill solid waste (OMSW), thermal pre-treated OMSW, and its co-digestion with Dunaliella salina

et al. 2020

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The aim of the present work was to compare the mesophilic anaerobic digestion of untreated olive mill solid waste (OMSW), soft hydrothermal pre-treated OMSW (SHP OMSW) and a co-digestion mixture of 95% OMSW and 5% microalga Dunaliella salina (Co-OMSW). During the co-digestion experiment, the volatile fatty acid accumulation decreased in comparison with that obtained for OMSW and SHP OMSW, reducing the slight inhibition observed during the OMSW and SHP OMSW experiments. Final values of methane yield of 380±1 mL CH4 g -1 VSadded for the OMSW, 424±2 mL CH4 g -1 VSadded for the SHP OMSW and 491±1 mL CH4 g -1 VSadded for the co-OMSW were determined. Two mathematical models, first-order kinetics and modified Gompertz model, were employed to fit the experimental data with the aim of elucidating the anaerobic biodegradation and obtain the kinetic constants. Both models allowed for adequately fitting the experimental results of methane production with time. The kinetic constant, k, of the first-order model increased by 12% for the Co-OMSW compared with the values achieved for OMSW and SHP OMSW. The modified Gompertz model revealed that the maximum methane production rate, Rm, for the Co-OMSW and SHP OMSW increased by 34.7% and 10.3% compared to the value obtained for OMSW.

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Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Cited by 10 publications

References 58 publications

Evaluation and modelling of methane production from corn stover pretreated with various physicochemical techniques

Evaluation and modelling of methane production from corn stover pretreated with various physicochemical techniques

Enhancing methane production from the invasive macroalga Rugulopteryx okamurae through anaerobic co-digestion with olive mill solid waste: process performance and kinetic analysis

Evolution of control parameters in biochemical methane potential tests of olive mill solid waste (OMSW), thermal pre-treated OMSW, and its co-digestion with Dunaliella salina

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