Optimization and Analysis of Liquid Anaerobic Co-Digestion of Agro-Industrial Wastes via Mixture Design

Regalado, Roberto Eloy Hernández; Weide, Tobias; Baumkötter, Daniel; Wettwer, Lukas; Häner, Jurek; Brügging, Elmar; Tränckner, Jens

doi:10.3390/pr9050877

Cited by 5 publications

(7 citation statements)

References 35 publications

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“…Since the calculated ratios were based on the yield of the two-substrate benchmark mixture, the ratio for the PM+CWM mixture was equal to 1. As for the batch data results from Regalado et al [24] and some complementary unpublished data, the MY MAX value corresponding to a maximum value of each operating point was used. In addition, a comparison between the MY MAX in the continuous and batch operation processes was made for each mixture.…”

Section: My Max_tm My Max_dm Continuousmentioning

confidence: 99%

“…The twosubstrate mixture of PM+CWM (pellets 1) had a BMP ∞ of 342.83 L CH4 /kg VS . Meanwhile, the BMP ∞ values for the three-substrate mixtures of pellets 2 and 3 were 534.21 and 530.28 L CH4 /kg VS , respectively [24,47]. After data cleaning, the resulting data sets have sizes of 162, 181, and 203 instances for reactors 1, 2, and 3 respectively.…”

Section: Reactors' Operation Overviewmentioning

confidence: 99%

“…To study the possible synergistic effects suggested by the interactions identified as acute effects in Regalado et al [24], the ratios between the maximum MYs in the continuous operation and batch validation tests were compared using equation 5. The results are shown in Table 5.…”

Section: Characterization Of Synergistic Effectsmentioning

confidence: 99%

“…In particular, the optimal compositions of two of the considered agro-industrial mixtures were determined using an approach initially designed by our group. The optimal composition of the third mixture was determined in Regalado et al [23] using the approach of Regalado et al [24]. The observed performance characteristics of the laboratory-scale reactors will form the basis for operation optimization and scale-up to pilot plant scale.…”

Section: Introductionmentioning

confidence: 99%

“…The MY < biomethane potential of the mixture at HRT ∞ (BMP ∞ ), which was taken from Regalado et al [24].…”

mentioning

confidence: 99%

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Continuous Co-Digestion of Agro-Industrial Mixtures in Laboratory Scale Expanded Granular Sludge Bed Reactors

et al. 2022

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Anaerobic co-digestion often improves the yields and stability of single anaerobic digestion. However, finding the right substrate proportions within mixtures and corresponding optimal operating conditions using a particular reactor technology often presents a challenge. This research investigated the anaerobic digestion of three mixtures from the liquid fractions of piglet manure (PM), cow manure (CWM), starch wastewater (SWW), and sugar beet (SBT) using three 30 L expanded granular sludge bed (EGSB) reactors. The synergistic effects of two three-substrate mixtures (i.e., PM+CWM+SWW and PM+CWM+SBT) were studied using the PM+CWM mixture as a benchmark. These were used to detect the predicted synergistic interactions found in previous batch tests. The methane productivity of both three-substrate mixtures (~1.20 LCH4/Lreact/d) was 2× the productivity of the benchmark mixture (0.64 LCH4/Lreact/d). Furthermore, strong indications of the predicted synergistic effects were found in the three-substrate mixtures, which were also stable due to their appropriate carbon-to-nitrogen ratio values. Moreover, the lowest averaged solid to hydraulic retention times ratio calculated for samples obtained from the top of the reactors was > 1. This confirmed the superior biomass retention capacity of the studied EGSB reactors over typical reactors that have been used in agricultural biogas plants with a continuous stirred tank reactor.

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Section: My Max_tm My Max_dm Continuousmentioning

confidence: 99%

Section: Reactors' Operation Overviewmentioning

confidence: 99%

Section: Characterization Of Synergistic Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The MY < biomethane potential of the mixture at HRT ∞ (BMP ∞ ), which was taken from Regalado et al [24].…”

mentioning

confidence: 99%

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Continuous Co-Digestion of Agro-Industrial Mixtures in Laboratory Scale Expanded Granular Sludge Bed Reactors

et al. 2022

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Anaerobic Co-Digestion of Fish Sludge Originating from a Recirculating Aquaculture System

Netshivhumbe,

Faloye,

Tolessa

et al. 2024

Waste Biomass Valor

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Anaerobic co-digestion (AcoD) of fish sludge (FS) with food waste (FW), and fruit and vegetable waste (FVW) for biogas and methane production was optimised in small-scale bioreactors, and batch and semi-continuous pilot-scale digesters, under mesophilic (37 ℃) conditions. An experimental mixture design was first applied to small-scale biomethane potential (BMP) tests, to determine the optimal mixture proportions of the AcoD of FS, FW, and FVW that maximise the specific methane yield (SMY in NmLCH4 gVS−1). The optimal mixture proportion was 67%FS:18%FW:19%FVW (w/w), producing 401 mLCH4 gVS−1, which was 8 times higher than the SMY when FS was mono-digested (48 mLCH4 gVS−1). The SMY achieved in batch pilot-scale digesters were 70–82% of methane yields obtained in BMP tests under the same operating conditions, with stable biogas production and no apparent inhibition during the batch run. Semi-continuous operation of the pilot-scale digester was undertaken with organic loading rates (OLRs) of 1, 2, and 3 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 , provided intermittently. However, the digester did not achieve stable biogas production at all of the evaluated OLRs, due to the intermittent feeding and accumulation of volatile fatty acids (VFAs): Improved process stability was achieved at an OLR of 2 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 , compared to OLRs of 1 and 3 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 . Optimisation of the AcoD process resulted in attractive biomethane yields from FS with FW and FVW co-feeds, indicating that producing biogas from co-digestion of FS with relevant substrates is a valuable managing tool for FS, while simultaneously providing renewable energy. The work provides novel data that elucidated optimal proportions in which to combine FS, FW and FVW to obtain optimal biogas production, and provided important new information relevant for the scale up and continuous operation of an AD process for treating FS. Graphical Abstract

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Techno-Economic Assessment of Solid–Liquid Biogas Treatment Plants for the Agro-Industrial Sector

et al. 2022

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The urgent need to meet climate goals provides unique opportunities to promote small-scale farm anaerobic digesters that valorize on-site wastes for producing renewable electricity and heat, thereby cushioning agribusinesses against energy perturbations. This study explored the economic viability of mono-digestion of cow manure (CWM) and piglet manure (PM) in small manured-based 99 kWel plants using three treatment schemes (TS): (1) typical agricultural biogas plant, (2) a single-stage expanded granular sludge bed (EGSB) reactor, and (3) a multistage EGSB with a continuous stirred tank reactor. The economic evaluation attempted to take advantage of the financial incentives provided by The Renewable Energy Sources Act in Germany. To evaluate these systems, batch tests on raw and solid substrate fractions were conducted. For the liquid fraction, data of continuous tests obtained in a laboratory was employed. The economical evaluation was based on the dynamic indicators of net present value and internal return rate (IRR). Sensitivity analyses of the electricity and heat selling prices and hydraulic retention time were also performed. Furthermore, an incremental analysis of IRR was conducted to determine the most profitable alternative. The most influential variable was electricity selling price, and the most profitable alternatives were TS1 (CWM) > TS1 (PM) > TS3 (CWM). However, further studies on co-digestion using TS3 are recommended because this scheme potentially provides the greatest technical flexibility and highest environmental sustainability.

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Optimization and Analysis of Liquid Anaerobic Co-Digestion of Agro-Industrial Wastes via Mixture Design

Cited by 5 publications

References 35 publications

Continuous Co-Digestion of Agro-Industrial Mixtures in Laboratory Scale Expanded Granular Sludge Bed Reactors

Continuous Co-Digestion of Agro-Industrial Mixtures in Laboratory Scale Expanded Granular Sludge Bed Reactors

Anaerobic Co-Digestion of Fish Sludge Originating from a Recirculating Aquaculture System

Techno-Economic Assessment of Solid–Liquid Biogas Treatment Plants for the Agro-Industrial Sector

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