Characterization and prediction of organic nitrogen biodegradability during anaerobic digestion: A bioaccessibility approach

Bareha, Y.; Girault, Romain; Jimenez, Julie; Trémier, Anne

doi:10.1016/j.biortech.2018.04.085

Cited by 38 publications

(11 citation statements)

References 31 publications

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“…Total solids (TS) and volatile solids (VS) were measured using standard methods [22]. TKN and total ammonia nitrogen concentrations were determined by distillation (TKN after mineralization) on wet and grounded samples [23].…”

Section: Methodsmentioning

confidence: 99%

Storage of Food Waste: Variations of Physical–Chemical Characteristics and Consequences on Biomethane Potential

Degueurce¹,

Picard²,

Peu³

et al. 2019

Waste Biomass Valor

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Food waste (FW) storage influences its physical-chemical characteristics and anaerobic digestion (AD) performance. In this work we present the results of two weeks long experiment where two types of FW were stored in dedicated cells (10 L and 300 L). Air was evenly flushed on the top surface of the substrates and then analyzed to identify and quantify possible gaseous emissions. Solid and liquid fractions were also periodically sampled and analyzed for total solid, volatile solid, ammonia and VFA contents. Results showed that storage initiated a hydrolysis process that modified the physical structure of FW, leading to the production of gases (CH 4 , CO 2 and ethanol) and a partly liquefied FW. Depending on experimental conditions, a fraction between 61 and 70% of the initial substrate remained solid at the end of the storage period. In the liquid phase, a large proportion of lactic acid was measured with maximum contents of 5.9 and 14.8 g/kg vs for the small-scale experiments with two different FW types and 3.0 g/kg vs for the large-scale experiment, leading to inhibition of the biomethane potential (BMP) tests. In conclusion, this work showed that when storage of FW is needed before AD, the optimal time recommended to keep a high methane yield is one week.

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Section: Methodsmentioning

confidence: 99%

Storage of Food Waste: Variations of Physical–Chemical Characteristics and Consequences on Biomethane Potential

Degueurce¹,

Picard²,

Peu³

et al. 2019

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…Moreover, the methanogens recovery during starvation might also be linked to the lower ammonium concentration of the digestates after starvation (0.89 ± 0.02 g NH 4 + /L, Table 1). Indeed, the nitrogen mineralization percentage was not recovered since ammonium levels in the effluents after starvation did not reach the same concentration as in scenario 3B.This could be explained by the different fate of carbon and nitrogen during AD [37]. In this case, it seems likely that nitrogen mineralization did not recover its initial efficiency.…”

Section: Microbial Population Dynamicsmentioning

confidence: 91%

Volatile Fatty Acids Production from Microalgae Biomass: Anaerobic Digester Performance and Population Dynamics during Stable Conditions, Starvation, and Process Recovery

2019

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Disturbances in anaerobic digestion (AD) negatively impact the overall reactor performance. These adverse effects have been widely investigated for methane generation. However, AD recently appeared as a potential technology to obtain volatile fatty acids (VFAs) and thus, the impact of process disturbances must be evaluated. In this sense, microbial response towards a starvation period of two weeks was investigated resulting in a conversion of organic matter into VFAs of 0.39 ± 0.03 COD-VFAs/CODin. However, the lack of feeding reduced the yield to 0.30 ± 0.02 COD-VFAs/CODin. Microbial analysis revealed that the starvation period favored the syntrophic acetate-oxidizing bacteria coupled with hydrogenotrophic methanogens. Finally, the system was fed at 9 g COD/Ld resulting in process recovery (0.39 ± 0.04 COD-VFAs/CODin). The different microbiome obtained at the end of the process was proved to be functionally redundant, highlighting the AD robustness for VFAs production.

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“…Total solids (TS) and volatile solids (VS) were measured on wet and ground samples, directly after sampling, using standard methods [21]. TKN and total ammonia nitrogen concentrations were determined by distillation (TKN after mineralization) on defrosted samples [22]. Chemical organic demand (COD) of FW and solid digestate was quantified by Mohr's salt dosage (after mineralisation) on dried and finely ground samples according to the manufacturer's instruction (855 Robotic Titrosampler, Metrohm).…”

Section: Physical-chemical Analysismentioning

confidence: 99%

An Innovative Solid-State Micro-Anaerobic Digestion Process to Valorize Food Waste: Technical Development Constraints and Consequences on Biological Performances

Degueurce

Dabert

Argence

et al. 2021

Waste Biomass Valor

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To face the increase of waste production and meet the energy demand of urban areas, municipal waste management systems should be rethought. Innovative solutions such as decentralised small-scale anaerobic digestion could be developed. This work presents the design, operation and performances of a new micro-scale anaerobic digester (AD) developed to degrade food waste (FW) in urban areas i.e. highly compact and with low water and energy demand. To meet these objectives, the new micro-scale AD is a semi-continuous and two-stage process built vertically to take advantage of the gravity to mix and move the digested matter instead of using mechanical devices. The first stage consists in a tubular reactor fed weekly with FW and periodically watered with leachate from the second stage reactor located below the tubular reactor. Results show that AD performances were highly correlated to the efficiency of hydric transfer between the tubular reactor and the leachate tank. Indeed, pH, volatile fatty acids and microbial community analysis showed that the hydrolysis occurred in the tubular reactor, while the methanogenesis step occurred in the leachate tank. Overall, the average methane production was 143 ± 87 NL/kgvs with an average methane content of 44 ± 10% and the operation mode of the process has still to be improved. Graphic Abstract

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Characterization and prediction of organic nitrogen biodegradability during anaerobic digestion: A bioaccessibility approach

Cited by 38 publications

References 31 publications

Storage of Food Waste: Variations of Physical–Chemical Characteristics and Consequences on Biomethane Potential

Storage of Food Waste: Variations of Physical–Chemical Characteristics and Consequences on Biomethane Potential

Volatile Fatty Acids Production from Microalgae Biomass: Anaerobic Digester Performance and Population Dynamics during Stable Conditions, Starvation, and Process Recovery

An Innovative Solid-State Micro-Anaerobic Digestion Process to Valorize Food Waste: Technical Development Constraints and Consequences on Biological Performances

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