Influence of the gas composition on the efficiency of ammonia stripping of biogas digestate

Bousek, J.; Scroccaro, D.; Šíma, Jiří; Weißenbacher, N.; Fuchs, Werner

doi:10.1016/j.biortech.2015.12.046

Cited by 68 publications

(38 citation statements)

References 24 publications

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“…During this process, the digester content (digestate) is treated in a separate column where it is exposed to increased pH and temperature causing the transfer of dissolved ammonia to gas phase which is removed through the application of a gas flow, usually air. Then, the stripped digestate is recirculated back into the reactor (Bousek et al, 2016;Pedizzi et al, 2017). When the stripping process lacks a previous solid-liquid separation step, the complete digestate from the reactor enters the stripping column, and therefore, a fraction of the reactor microbial community is exposed to the harsh conditions of the stripping process.…”

Section: Introductionmentioning

confidence: 99%

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Fernandez‐Gonzalez

Pedizzi

Lema

et al. 2019

Microbial Biotechnology

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Summary Air‐side stripping without a prior solid–liquid phase separation step is a feasible and promising process to control ammonia concentration in thermophilic digesters. During the process, part of the anaerobic biomass is exposed to high temperature, high pH and aerobic conditions. However, there are no studies assessing the effects of those harsh conditions on the microbial communities of thermophilic digesters. To fill this knowledge gap, the microbiomes of two thermophilic digesters (55°C), fed with a mixture of pig manure and nitrogen‐rich co‐substrates, were investigated under different organic loading rates (OLR: 1.1–5.2 g COD l−1 day−1), ammonia concentrations (0.2–1.5 g free ammonia nitrogen l−1) and stripping frequencies (3–5 times per week). The bacterial communities were dominated by Firmicutes and Bacteroidetes phyla, while the predominant methanogens were Methanosarcina sp archaea. Increasing co‐substrate fraction, OLR and free ammonia nitrogen (FAN) favoured the presence of genera Ruminiclostridium, Clostridium and Tepidimicrobium and of hydrogenotrophic methanogens, mainly Methanoculleus archaea. The data indicated that the use of air‐side stripping did not adversely affect thermophilic microbial communities, but indirectly modulated them by controlling FAN concentrations in the digester. These results demonstrate the viability at microbial community level of air side‐stream stripping process as an adequate technology for the ammonia control during anaerobic co‐digestion of nitrogen‐rich substrates.

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Section: Introductionmentioning

confidence: 99%

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Fernandez‐Gonzalez

Pedizzi

Lema

et al. 2019

Microbial Biotechnology

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“…The management of agricultural waste, animal manure (bovine, swine, and poultry), and food residues by means of anaerobic digestion (AD) is becoming more important [1,2]. In anaerobic digestion (AD), the microorganisms in the absence of oxygen break down the biodegradable matter and produce a valuable biogas consisting of mostly methane [3].…”

Section: Introductionmentioning

confidence: 99%

The Valorization of Ammonia in Manure Digestate by Means of Alternative Stripping Reactors

et al. 2018

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The proper recovery of resources such as nitrogen and phosphorus present in the manure from intensive livestock farming is essential in order to allow environmental sustainable zootechny especially in densely populated areas where these activities are historically prevalent. The experiences at full-scale established that the ammonia stripping allows recovery from 35% to 50% of nitrogen depending on the type of substrate treated with anaerobic digestion and on the nitrogen content/form in the digestate. This study focuses on the ammonia stripping on digestate derived from anaerobic digestion of livestock manure and corn silage. Two different full-scale plants are studied including a packed column and an air bubble reactor without filling material with the aim to reduce fouling issues due to the content of suspended solids in digestate. The main results suggest that the use of an air bubble reactor could treat digestate with high concentration of suspended solids. A deeper study based on a two-level factorial experiment highlights that the temperature is an important parameter that influences the ammonia removal yields. Thus, a proper management of available thermal energy is very important.

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“…In order to improve the digestion of mono fermentation mixture of poultry litter, air stripping is performed on the substrate to reduce the concentration of nitrogen as previously detailed [20]. Even though the pH and temperature of the substrate influence the nitrogen reduction from organic feedstocks, it is noted from the past researches on air stripping, the pH acts as a most persuasive factor.…”

Section: Resultsmentioning

confidence: 99%

Mitigation of nitrogen in the poultry litter to enhance biomethane production

Balaji¹,

Sakthivel²,

Alagirisamy³

et al. 2018

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI161004113BThe objective of the study is to lower the nitrogen content in the substrate to mitigate the ammonia nitrogen generated in the anaerobic digestion of poultry litter using air stripping technique. The effect of nitrogen mitigation on the biomethane yield from poultry litter was studied in batch experiments with an organic load of 8 kg for a hydraulic retention time of 21 days in mesophilic ambiance. Air stripping results indicate that the free ammonia stripping is greatly influenced by the pH of the substrate and the aeration time. It is observed that the total Kjeldahl nitrogen content in the poultry litter substrate is reduced from 6.9% to 3.69% that is about a reduction of 53%. A significant improvement in the biomethane yield was noticed for poultry litter of which nitrogen content is lowered at a pH 11. The cumulative yield for air stripped substrate increased from 8.77 L/kg to 10.66 L/kg volatile solids. The biomethane production from air stripped poultry litter shows improvement of 18% compared to the control test. From this results, it is evident that the reduction in the nitrogen content of the substrate using air stripping at high pH value is a possible option for enhancing the biomethanisation of poultry litter.

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Influence of the gas composition on the efficiency of ammonia stripping of biogas digestate

Cited by 68 publications

References 24 publications

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

The Valorization of Ammonia in Manure Digestate by Means of Alternative Stripping Reactors

Mitigation of nitrogen in the poultry litter to enhance biomethane production

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