Effects of carbon: Nitrogen ratio on anaerobic digestion of dairy manure

Hills, David J.

doi:10.1016/0141-4607(79)90011-8

Cited by 96 publications

(32 citation statements)

References 7 publications

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“…The best results were achieved for TPOP/PS 80:20 w/w and 60:40 w/w with COD/TAN ratio values of 260 and 97 respectively. These results suggest that tested feedstocks are close to values reported as optimal, since substrates in co-digestion balances the mono-digestion drawbacks [33]. Fig.…”

Section: Control Parameters: Ph Alkalinity and Volatile Fatty Acidssupporting

confidence: 79%

Techno-economic anaerobic co-digestion feasibility study for two-phase olive oil mill pomace and pig slurry

2016

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a b s t r a c tAnaerobic mono-(AmoD) and co-digestion (AcoD) of two-phase olive oil mill pomace (TPOP) and pig slurry (PS) at different ratios were studied in a semi-continuous stirred tank reactor (sCSTR) at mesophilic temperature (37 C). The methane yields for AcoD experiments ranged from 150.9 to 274.3 L CH 4 kg VS À1 d À1 . The maximum chemical oxygen demand (COD) removal rate (59.60%) was achieved for TPOP/PS 80:20 w/w substrate composition at OLR 3.68 g VS L reactor À1 d À1 and 24 days HRT. Despite the energy production from food waste is not a new process, the industrial implementation and application continue to be a challenge. Hence, the present paper also reports on the economic feasibility study of a full scale anaerobic co-digestion plant to treat 7000 t year À1 and 1750 t year À1 of TPOP and PS, respectively. The results of this study are compared against a conventional PS mono-digestion plant. Net present values (NPV) and payback time periods (PBT) were reported to be 782,493 V and 135,701 V and 6.7 and 9.2 years for AcoD and AmoD plants, respectively. Finally, the sensibility analysis concluded that AcoD configuration is less dependent on energy and compost sale prices variations.

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Section: Control Parameters: Ph Alkalinity and Volatile Fatty Acidssupporting

confidence: 79%

Techno-economic anaerobic co-digestion feasibility study for two-phase olive oil mill pomace and pig slurry

2016

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“…This difference between ratios could influence the methane yield. The optimum C/N ratio for anaerobic digestion has been found to be 25 (Hills, 1979) or between 20-30 (Speece, 1987). The phosphorus content of 0.74-0.84 mg g -1 for wheats A and B was lower than the 1.77 mg g -1 in wheat C. The heavy metals composition for wheats A, B and C were measured and the two regarded as critical in terms of toxicity (Commission regulation (EC) No1881/2006) are high within an acceptable range except for wheat C. This regulation gives values of Cd = 0.2 mg/kg and Pb = 0.2 mg/kg on a wet weight basis.…”

Section: Influence Of Growth Stage and Storage Practice In The Bmp Testmentioning

confidence: 99%

Biochemical methane potential of winter wheat (Triticum aestivum L.): Influence of growth stage and storage practice

Rincón

Banks

Heaven

2010

Bioresource Technology

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The effect of growth stage at harvest and of storage practice on the biochemical methane potential (BMP) of winter wheat was investigated using batch-fed stirred mesophilic digesters. The wheat used was a single variety sown at the same time (autumn) and harvested at 3 different stages in its growth: medium milk (A); soft dough (B) and Caryopsis (C). Wheats (A and B) were ensiled whilst the later harvested material (C) with a higher dry matter content was treated by the alkalage process. The BMP values expressed on the basis of volatile solids (VS) were 0.360±0.030, 0.346±0.006 and 0.311±0.016 l CH 4 g -1 VS added for A, B and C respectively. A simple first order kinetic model gave only a poor fit to the experimental data but a close match was obtained using a modified first order pseudo-parallel model which explains the methane production curve on the basis of differences in biodegradability of the plant material.

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“…This pH rage is optimum for the growth of bacterial culture and it can be said that there is no negative effect of pH on the biogas production from cattle manure. Most of the research results indicate that the ratio of carbon to nitrogen (C:N), micronutrients (trace elements) and phosphorus are important for anaerobic growth of bacteria during biogas production, and the optimum range for C:N ratio is 20-35 (Hills, 1979;Tarbaghia, 1993;Ghasimi et al, 2009). Our results show that…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Biogas Production Yields of Different Waste Materials

Öztürk¹

2012

ESR

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Biogas production from three different sources namely, cattle manure, cheese whey and blood, which have different characteristics, were investigated comparatively. Biogas production rates of 0.63, 0,72 and 0,64 l min PO were observed in 30 days of digestion of manure. The amount of total nitrogen (Tot-N) decreased 10% in 30 days of digestion but ammonium-nitrogen (Am-N) increased 46% at the same duration of time. Manure, during co-digestion, buffered and inoculated the cheese whey and blood, and converted them to the energy source. An average COD removal of 52% or 34% is also possible during co-digestion of cheese whey or blood with manure.

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Effects of carbon: Nitrogen ratio on anaerobic digestion of dairy manure

Cited by 96 publications

References 7 publications

Techno-economic anaerobic co-digestion feasibility study for two-phase olive oil mill pomace and pig slurry

Techno-economic anaerobic co-digestion feasibility study for two-phase olive oil mill pomace and pig slurry

Biochemical methane potential of winter wheat (Triticum aestivum L.): Influence of growth stage and storage practice

Evaluation of Biogas Production Yields of Different Waste Materials

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