Alternative co-digestion scenarios for efficient fixed-dome reactor biomethanation processes

Fotidis, Ioannis A.; Laranjeiro, Tiago Filipe Vicente Costa; Angelidaki, Irini

doi:10.1016/j.jclepro.2016.04.008

Cited by 18 publications

(5 citation statements)

References 44 publications

(45 reference statements)

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“…In the present study, the pH value for both the influent and effluent was 6.1 ± 0.8 and 7.6 ± 0.3 at psychrophilic temperature. The pH range for a healthy and continuous AD process is 6.8-8.2 [11]. The FOS/TAC ratio ranged between 0.72 ± 0.2-0.17 ± 0.1 mg of acetic acid/mg of CaCO 3 for the affluent and effluent, respectively.…”

Section: Chemical Oxygen Demand Concentration For Influent (Blue Rhombuses) and Effluent (Orange Cruxes) During Olr Changesmentioning

confidence: 99%

“…(16-20 • C) reached a specific biogas yield of 0.10 m 3 biogas /kg VS [10]. Therefore, biodigesters operated under psychrophilic conditions may present limitations due to the facts that: (i) microbial activity is slowed because the optimum growth temperature of bacteria and archaea is 37 • C; (ii) the removal of organic matter decreases, as does the concentration of methane in the biogas, and a fraction of this biogas is solubilized in the digestate; and (iii) in view of the above, the digestate contains organic matter that is converted to ammonia (NH 3 ) and methane (CH 4 ) during storage and soil usage [11]. Thus, this can be translated into a loss of energy efficiency and a larger environmental impact due to the aforementioned gaseous emissions [12].…”

Section: Introductionmentioning

confidence: 99%

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Psychrophilic Full Scale Tubular Digester Operating over Eight Years: Complete Performance Evaluation and Microbiological Population

Jaimes-Estévez¹,

Zafra²,

Martí-Herrero³

et al. 2020

Energies

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Most biogas plants in the world run under psychrophilic conditions and are operated by small and medium farmers. There is a gap of knowledge on the performance of these systems after several years of operation. The aim of this research is to provide a complete evaluation of a psychrophilic, low-cost, tubular digester operated for eight years. The thermal performance was monitored for 50 days, and parameters such as pH, total volatile fatty acid (tVFA), chemical oxygen demand (COD) and volatile solids (VS) were measured every week for the influent and effluent. The digester operated at a stabilized slurry temperature of around 17.7 °C, with a mean organic load rate (OLR) equal to 0.52 kg VS/m3digester *d and an estimated hydraulic retention time (HRT) of 25 days. The VS reduction in the digester was around 77.58% and the COD reduction was 67 ± 3%, with a mean value for the effluent of 3.31 ± 1.20 g COD/Lt, while the tVFA decreased by 83.6 ± 15.5% and the presence of coliforms decreased 10.5%. A BioMethane potential test (BMP) for the influent and effluent showed that the digester reached a specific methane production of 0.40 Nm3CH4/kg VS and a 0.21 Nm3CH4/m3digester d with 63.1% CH4 in the biogas. These results, together with a microbiological analysis, show stabilized anaerobic digestion and a biogas production that was higher than expected for the psychrophilic range and the short HRT; this may have been due to the presence of an anaerobic digestion microorganism consortium which was extremely well-adapted to psychrophilic conditions over the eight-year study period.

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Section: Chemical Oxygen Demand Concentration For Influent (Blue Rhombuses) and Effluent (Orange Cruxes) During Olr Changesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Psychrophilic Full Scale Tubular Digester Operating over Eight Years: Complete Performance Evaluation and Microbiological Population

Jaimes-Estévez¹,

Zafra²,

Martí-Herrero³

et al. 2020

Energies

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show abstract

“…These obstacles can be overcome by adding co-substrate to the reactor. This method is considered to be able to increase biogas production to more than 20% CH4 than predicted [6,12]. Various studies have been carried out related to the use of co-substrates in the production of biogas with biomass substrates.…”

Section: Anaerobic Co-digestionmentioning

confidence: 99%

Rice husk as renewable energy for biogas production from biomass: prospect and challenges

2020

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Greenhouse gas emissions go hand in hand with fossil energy consumption. The use of fossil energy has increased sharply in the past 15 years. Biogas is one of renewable energy derived from biomass that can overcome greenhouse gas emissions and reduce the generation of organic solid waste. Some materials with high lignin content are good substrates to increase biogas production. Rice husk is a potential material to be used as a biogas substrate and it is quite abundant in Indonesia. However, its utilization for full scale operation has not been maximized. This review article will discuss the potential of rice husks as substrates and prospects in their implementation including various characteristics, influence factors to optimize and up-scale the biogas production. Further research is needed to increase biogas production and overcome existing obstacles.

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“…As steady-state was defined a quasi-steady-state (Venkiteshwaran et al, 2016), for at least a period of ten successive days with less than 10 % variation in the methane production, VFA accumulation and pH fluctuation (Fotidis et al, 2016).…”

Section: Steady-statementioning

confidence: 99%

“…1) of 263 mL CH 4 g -1 VS, at steady-state. defined as a period of ten successive days with less than 10 % variation in the methane production, VFA accumulation and pH fluctuation (Fotidis et al, 2016). When ammonia levels increased in the feedstock to 3 g NH 4 + -N L -1 (P-2) and 4 g NH 4 + -N L -1 (P-3) methane production, at inhibitedsteady-state, was decreased in both reactors between 30 and 43 % compared to P-1.…”

Section: Reactors Performancementioning

confidence: 99%

Effects of added enzymes on sorted, unsorted and sorted-out barley: A model study on realtime viscosity and process potentials using rapid visco analyser

Shetty

Zhuang

Olsen

et al. 2017

Journal of Cereal Science

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Many ammonia-rich biomass sources, such as manures and protein-rich substrates, are potential inhibitors of the anaerobic digestion (AD) process. It was previously demonstrated that bioaugmentation of Methanoculleus bourgensis MS2T in an ammonia inhibited process in a continuous stirred tank reactor (CSTR), resulted in up to 90 % recovery of the methane production compared to the uninhibited production. However, cultivation of pure strains has practical difficulties due to the need of special growth media and sterile conditions. In contrast, acclimatized enriched cultures have minor sterility requirements. In the current study, an enriched ammonia-tolerant methanogenic culture was bioaugmented in a CSTR reactor operating under ammonia-induced, inhibited-steady-state. The results demonstrated that bioaugmentation, completely counteracted the ammonia toxicity effect. This indicates that a commercial application of bioaugmentation could improve up to 36 % the methane production, the greenhouse gas reduction efficiency and the gross revenue of ammonia inhibited full scale biogas reactors. 16S rRNA gene sequencing showed that bioaugmentation changed the microbial composition of the reactors resulting in higher bacterial and lower archaeal community diversity. The bioaugmented reactor showed a fourfold increase of the abundance of the bioaugmented methanogens compared to the control reactor. This indicates that ammonia-tolerant methanogens established well in the ammonia-inhibited reactor and dominated over the domestic methanogenic population. Finally, this study showed that the enriched culture alleviated ammonia toxicity 25 % more efficiently than the previously used pure culture.

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Alternative co-digestion scenarios for efficient fixed-dome reactor biomethanation processes

Cited by 18 publications

References 44 publications

Psychrophilic Full Scale Tubular Digester Operating over Eight Years: Complete Performance Evaluation and Microbiological Population

Psychrophilic Full Scale Tubular Digester Operating over Eight Years: Complete Performance Evaluation and Microbiological Population

Rice husk as renewable energy for biogas production from biomass: prospect and challenges

Effects of added enzymes on sorted, unsorted and sorted-out barley: A model study on realtime viscosity and process potentials using rapid visco analyser

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