The influence of the total-ammonia concentration on the thermophilic digestion of cow manure

Zeeman, G.; Wiegant, W.M.; Koster-Treffers, M.E.; Lettinga, G.

doi:10.1016/s0141-4607(85)80014-7

Cited by 123 publications

(58 citation statements)

References 9 publications

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“…The methane content in the bio-gas increased from 59.3% to 63% between 55 and 20 °C (at 1.5 kgVS/m 3 day OLR), which partly counteracted the decrease in volumetric bio-gas production rate. Similar results were obtained by Alvarez and Lidén 26 , Hansen, Angelidaki 27 and Zeeman, Wiegant 28 , where the methane production rate in psychrophilic digesters is reduced compared to mesophilic and thermophilic reactors treating cow dung.…”

Section: Interpretation Of Contour Plots and 3d Response Surfacessupporting

confidence: 86%

Process Optimization and Modeling of Anaerobic Digestion of Cow Manure for Enhanced Biogas Yield in a Mixed Plug-flow Reactor using Response Surface Methodology

Rasouli⃰¹,

Ajabshirchi²,

Mousavi³

et al. 2015

Biosci., Biotech. Res. Asia

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Pilot scale experiments were performed on the digestion of dairy cow manure in a semi-continuous process using a mixed plug flow reactor (MPFR) to determine the effects of organic loading rate (OLR), temperature and mixing levels on production biogas and methane yield. Response surface methodology (RSM) was applied for the design and analysis of experiments with the optimization of OLR, temperature and mixing level during the biogas production process. Experiments were designed as per the central composite design technique. Four cubic mathematical models were derived for prediction of the responses. The optimization study has been carried out to identify the highest yields achievable when the factors temperature and mixing are minimized. In process optimization, maximum values of biogas production and methane yield were achieved as 0.570 m 3 /m 3 day and 0.113 m 3 /kgVS added, respectively, with an OLR of 3.15 kgVS/m 3 day, temperature of 37.66 °C and mixing regime of 20.32 rpm for 10 min per 2 hours.

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Section: Interpretation Of Contour Plots and 3d Response Surfacessupporting

confidence: 86%

Process Optimization and Modeling of Anaerobic Digestion of Cow Manure for Enhanced Biogas Yield in a Mixed Plug-flow Reactor using Response Surface Methodology

Rasouli⃰¹,

Ajabshirchi²,

Mousavi³

et al. 2015

Biosci., Biotech. Res. Asia

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“…In an unadapted process, ammonia inhibition occurred at 0.08-0.15 gN/l free ammonia concentration (Braun et al 1981;de Baere et al 1984;Ikbal et al 2003), while an adapted inhibition during the treatment of livestock manure occurred at 0.7-1.1 gN/ l of free ammonia (Angelidaki and Ahring 1993;Hansen et al 1998). The total ammonia concentration is also a factor in the inhibition of methanogenesis (Zeeman et al 1985). With unadapted cultures, ammonia inhibition occurred at a total ammonia concentration of about 2.5 gN/l (van Velsen 1979;Hashimoto 1986), while adapted cultures can tolerate ammonia up to a concentration of 4-6.5 gN/l (Hashimoto 1986;Angelidaki and Ahring 1993;Schnürer et al 1999).…”

Section: Ammonia Inhibitionmentioning

confidence: 99%

Factors influencing the degradation of garbage in methanogenic bioreactors and impacts on biogas formation

Murakami

Sasaki

2012

Appl Microbiol Biotechnol

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Anaerobic digestion of garbage is attracting much attention because of its application in waste volume reduction and the recovery of biogas for use as an energy source. In this review, various factors influencing the degradation of garbage and the production of biogas are discussed. The surface hydrophobicity and porosity of supporting materials are important factors in retaining microorganisms such as aceticlastic methanogens and in attaining a higher degradation of garbage and a higher production of biogas. Ammonia concentration, changes in environmental parameters such as temperature and pH, and adaptation of microbial community to ammonia have been related to ammonia inhibition. The effects of drawing electrons from the methanogenic community and donating electrons into the methanogenic community on methane production have been shown in microbial fuel cells and bioelectrochemical reactors. The influences of trace elements, phase separation, and co-digestion are also summarized in this review.

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“…It is therefore common to ®nd a wide range of values reported at which the anaerobic digestion process is deemed to have been inhibited by ammonia/amonium ion [25,26]. It is, however, well accepted that toxicity effects may be detrimental to the anaerobic process performance in both homoge- [27,28] has been found to be very dif®cult at ammonia nitrogen concentration of 3 g/l; in these cases the authors attributed these dif®culties to ammonia toxicity rather than high volatile solids loadings. The effect is likely to be more pronounced on the methanogenic population in the digester as these are reported to have the greatest sensitivity [29], Methanobacterium formicum, for example, was shown to be at least partially inhibited at an ammoniacal nitrogen concentration of 3.3 g/l.…”

Section: Kinetics Of Methane Productionmentioning

confidence: 99%

Effect of temperature and pH on the kinetics of methane production, organic nitrogen and phosphorus removal in the batch anaerobic digestion process of cattle manure

Sánchez¹,

Borja

Weiland³

et al. 2000

Bioprocess Engineering

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A study of the effect of temperature and pH on the kinetics of methane production and organic nitrogen and phosphorus degradation in the anaerobic digestion process of cattle manure was carried out. Two laboratoryscale batch completely mixed reactors, operating at 35°C (mesophilic temperature), and other two, operating at 60°C (thermophilic temperature) were used. For each temperature selected, the in¯uent pH values were 7.6 (initial pH of the waste used) and 7.0. The apparent kinetic constants of the biomethanization process increased 2.3 times when the initial pH of the in¯uent was increased from 7.0 to 7.6 at mesophilic temperature. The values found at thermophilic temperature were similar. The kinetic constants of methane production decreased 2.6 and 7.2 times when the operating temperature increased from 35°C to 60°C for the experiments carried out at initial pH of 7.0 and 7.6, respectively. The methane yield coef®cient (l CH 4 STP/g VS removed) also decreased when the temperature increased from 35°C to 60°C for the two initial pH values studied. This behaviour agreed with the major inhibition level observed at thermophilic temperature as a result of the higher organic nitrogen removal and ammonia nitrogen production observed at 60°C. Speci®-cally, the speci®c rate constants for organic nitrogen removal and ammonia nitrogen production increased 3.6 and 12 times when the temperature was increased from 35°C to 60°C for the experiments carried out at initial pH values of 7.0 and 7.6, respectively. In the same way, the values of the kinetic constant for phosphorus removal were 44% and 80% higher than those obtained at 35°C for the two initial pH values above-mentioned, respectively. Finally, the experimental values of organic nitrogen and phosphorus concentrations were reproduced with deviations equal to or less than 10% and 15% in every case, respectively.

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The influence of the total-ammonia concentration on the thermophilic digestion of cow manure

Cited by 123 publications

References 9 publications

Process Optimization and Modeling of Anaerobic Digestion of Cow Manure for Enhanced Biogas Yield in a Mixed Plug-flow Reactor using Response Surface Methodology

Process Optimization and Modeling of Anaerobic Digestion of Cow Manure for Enhanced Biogas Yield in a Mixed Plug-flow Reactor using Response Surface Methodology

Factors influencing the degradation of garbage in methanogenic bioreactors and impacts on biogas formation

Effect of temperature and pH on the kinetics of methane production, organic nitrogen and phosphorus removal in the batch anaerobic digestion process of cattle manure

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