Process performance of biogas digesters incorporating pre-separated manure

Møller, Henrik Bjarne; Nielsen, Anne Ellerup; Nakakubo, Ryoh; Olsen, H.J.

doi:10.1016/j.livsci.2007.09.014

Cited by 58 publications

(37 citation statements)

References 8 publications

(6 reference statements)

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“…Low biodegradability (BD) of animal slurry is often caused by large amounts of indigestible fractions which are concentrated during animal digestion. The quantity of organic pools in slurry is often too small to perform economically viable operations [10,11]. Biogas productivity per unit of feedstock volume is inevitably related to its biochemical and physical composition.…”

Section: Biogas Production Using Animal Slurrymentioning

confidence: 99%

“…Meanwhile, in Denmark industrial organic waste is co-digested in most large scale biogas plants to increase methane yield. This results in limited availability of organic industrial waste, creating a setback of extending the biogas industry [11,17]. 20 Animal manures from different farms were collected.…”

Section: Biogas Production Using Animal Slurrymentioning

confidence: 99%

“…Hence, animal slurry has unique characteristics compared to other biomasses, since during digestion the relatively easily degradable organic matter is utilized while recalcitrant carbon concentrations are increased by animal digestion [10], which limits subsequent anaerobic degradability (BD) and biogas potential. Moreover, the quantity of organic polls in liquid slurry is often too small to perform economically viable operations [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of Animal Slurry as a Key Biomass for Biogas Production in Denmark

Triolo¹,

Ward²,

Pedersen³

et al. 2013

Biomass Now - Sustainable Growth and Use

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Section: Biogas Production Using Animal Slurrymentioning

confidence: 99%

Section: Biogas Production Using Animal Slurrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characteristics of Animal Slurry as a Key Biomass for Biogas Production in Denmark

Triolo¹,

Ward²,

Pedersen³

et al. 2013

Biomass Now - Sustainable Growth and Use

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“…Since the dry fraction of manure has a higher ammonium and protein content than the original liquid manure, this strategy can have a negative effect on gas production due to ammonia inhibition. Methane yield from pig manure in a digester supplemented with 60% (w/w) of separated solid manure was 200 l CH 4 /kg volatile solids (VS) compared to 320 l CH 4 /kg VS in a reference digester operating solely on unseparated pig manure (Møller et al, 2007). This difference was attributed to the high level of total ammonia nitrogen (TAN) exceeding 5 g/l in the digester processing the higher content of solid fraction pig manure.…”

Section: Introductionmentioning

confidence: 99%

Ammonia Inhibition in Thermophilic Anaerobic Digestion of Dairy Cattle Manure

Sutaryo¹,

Ward²,

Møller³

2014

J. Indonesian Trop. Anim. Agric.

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ABSTRAKPenelitan ini bertujuan untuk mengevaluasi perbedaan lima konsentrasi total amonia nitrogen (TAN) dan amonia terhadap produksi methan dan kinerja digester biogas pada kondisi thermophilic (50°C). Penelitian menggunakan lima digester identik dengan pengisian subtrat secara kontinyu. Data diperoleh selama empat kali ulangan masa tinggal substrat di dalam digester. Data dianalisis dengan menggunakan fasilitas pengolahan data yang tersedia pada program Microsoft Excel. Lima konsentrasi TAN diperoleh dengan menambahkan urea sampai diperoleh konsentrasi TAN dan amonia yang diinginkan untuk selanjutnya konsentrasi tersebut dijaga dengan pemberian urea pada digester biogas disetiap harinya. Hasil penelitian menunjukkan adanya hubungan negatif yang sangat kuat antara konsentrasi TAN dan amonia terhadap produksi methan. Produksi methan berkurang sebesar 24, 30, 52 dan 66% pada digester yang mempunyai konsentrasi TAN 2.9, 3.6, 4.4 and 5.1 g/L setara dengan 0.7, 1.1,1.5 and 1.8 g/L AB. Konsentrasi total asam lemak mudah menguap, isovalerat dan isobutirat berada pada konsentrasi yang tinggi selama terjadinya penghambatan kinerja mikroorganisme oleh ammonia. Konsentrasi TAN pada digester biogas sebesar dan atau lebih dari 3 g/L mengindikasikan bahwa seringkali produksi methan di bawah kondisi produksi optimumnya, oleh karena itu untuk mengkompensasinya masa tinggal substrate pada digester biogas harus diperpanjang atau digester biogas dioperasikan pada temperatur yang lebih rendah. Kata kunci: inhibisi, total amonia nitrogen, amonia, produksi methan, asam lemak mudah menguap ABSTRACTThis study investigated the effect of five different concentrations of total ammonia nitrogen (TAN) and free ammonia (FA) on the methane yield and digester performance under thermophilic conditions (50°C). Five identical continuously fed digesters were used. The experiment was run for four times hydraulic retention time (HRT). Data were statitically analysed using the data Analysis Tool Pack available with the Microsoft Excel program. Different ammonia levels were obtained by pulsing urea to obtain the target level of TAN and FA, and to subsequently maintaining the concentration of ammonia levels by daily urea additions. The result showed a strong negative correlation between both TAN and FA concentrations and methane yield. The methane yield was reduced by 24, 30, 52 and 66% in digesters that had TAN levels of 2.9, 3.6, 4.4 and 5.1 g/L, respectively, corresponding to 0.7, 1.1,1.5 and 1.8 g/L FA. Total volatile fatty acid and especially isovaleric and isobutyric acid concentrations were elevated during ammonia inhibition. Concentration of TAN in the biogas digester exceeding 3 g/L indicating that very often the full biogas potential is not achieved due to ammonia inhibition and that longer HRT should be used to compensate or a lower process temperature should be chosen.

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“…The anaerobically digested livestock manure (ADM) can be applied to land in its liquid form (ADM L ), or separated into liquid and solid fractions (Moller et al, 2006). The liquid fraction can either be used as irrigation water or be recycled back to bio-gas production.…”

Section: Introductionmentioning

confidence: 99%

Yield, Nitrogen, Phosphorus, Copper and Zinc Uptake by Barley Forage Amended with Anaerobically Digested Cattle Feedlot Manure (ADM)

Hao

Hill

Caffyn

et al. 2013

E3S Web of Conferences

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Abstract.With increasing production of bio-gas and availability of anaerobically digested cattle feedlot manure (ADM), we need a better understanding of the impact of its application on crop production and the environment. The objective of this study was to investigate nutrient and heavy metal uptake by barley forage from soil amended with ADM. A four-year field study was conducted in southern Alberta to compare annual application of ADM liquid (ADML), and the solid fraction separated from the ADM (ADMS) to raw undigested cattle feedlot manure (CFMR). An unamended control (CK) was also included for comparison. Treatments were replicated four times using a split plot experimental design. All amendments were applied in spring each year prior to seeding and barley was grown and harvested at the soft dough stage for making cattle silage feed. All amendments were applied at rates supplying 100 or 200 kg N ha-1 yr-1, assuming 100% mineral N and 50% organic N was available to crops in the year of application. Averaged over four years, the highest yields were found from ADML (9.55 and 9.6 Mg ha-1 yr-1), and lowest from CK (6.93 Mg ha-1 yr-1), with ADMS and CFMR (7.80 to 8.66 Mg ha-1) in between. Contents and total uptake of nutrients and heavy metals (N, P, Cu and Zn) by barley forage from ADML were higher than ADMS and CFMR. and higher at 200 kg N ha-1 yr-1 than 100 kg N ha-1yr-1. Our data suggest that anaerobic digestion increases nutrients and heavy metal availability in cattle feedlot manure, but most increases occurred in the liquid fraction. Our data also suggest that the impact of organic amendment application on forage barley production is not only affected by the types of amendment used, but also by agronomic practices (e.g., seeding date) as well as growing conditions.

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Process performance of biogas digesters incorporating pre-separated manure

Cited by 58 publications

References 8 publications

Characteristics of Animal Slurry as a Key Biomass for Biogas Production in Denmark

Characteristics of Animal Slurry as a Key Biomass for Biogas Production in Denmark

Ammonia Inhibition in Thermophilic Anaerobic Digestion of Dairy Cattle Manure

Yield, Nitrogen, Phosphorus, Copper and Zinc Uptake by Barley Forage Amended with Anaerobically Digested Cattle Feedlot Manure (ADM)

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