Assessment of the biochemical methane potential of mono- and co-digested dairy farm wastes

Adghim, Mohamad; Abdallah, Mohamed; Saad, Suhair; Shanableh, Abdallah; Sartaj, Majid

doi:10.1177/0734242x19871999

Cited by 20 publications

(4 citation statements)

References 28 publications

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“…For the same reason, cattle manure with 15.68 m 3 CH 4 t −1 was responsible for the 44% of the total feedstock in the 1st period. Regarding the CH 4 yield of the substrates, similar results were reported by previous studies about the BMP of cattle manure [25], pig manure [26], poultry manure [27], glycerine [28], corn silage [29], cheese whey [30] and grape pomace [31].…”

Section: Bmps Of Substrates and Comparison With The Actual Methane Production Of The Biogas Plant-preliminary Assessment Of Ammonia Toxicsupporting

confidence: 86%

The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method

et al. 2021

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Ammonia accumulation in biogas plants reactors is becoming more frequently encountered, resulting in reduced methane (CH4) production. Ammonia toxicity occurs when N-rich substrates represent a significant part of the biogas plant’s feedstock. The aim of this study was to develop an estimation method for the effect of ammonia toxicity on the CH4 production of biogas plants. Two periods where a biogas plant operated at 3200 mg·L−1 (1st period) and 4400 mg·L−1 (2nd period) of ammonium nitrogen (NH4+–N) were examined. Biomethane potentials (BMPs) of the individual substrates collected during these periods and of the mixture of substrates with the weight ratio used by the biogas plant under different ammonia levels (2000–5200 mg·L−1 NH4+–N) were determined. CH4 production calculated from the substrates’ BMPs and the quantities used of each substrate by the biogas plant was compared with actual CH4 production on-site. Biogas plant’s CH4 production was 9.9% lower in the 1st and 20.3% in the 2nd period in comparison with the BMP calculated CH4 production, of which 3% and 14% was due to ammonia toxicity, respectively. BMPs of the mixtures showed that the actual CH4 reduction rate of the biogas plant could be approximately estimated by the ammonia concentrations levels.

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Section: Bmps Of Substrates and Comparison With The Actual Methane Production Of The Biogas Plant-preliminary Assessment Of Ammonia Toxicsupporting

confidence: 86%

The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method

et al. 2021

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“…The maximum methane release occurred during storage, at 20 and 25 °C, reaching 4.90 LNCH4 (kgVSCO) −1 , the minimum of 0.23 LNCH4 (kgVSCO) −1 was determined for storage, at 5 °C. In comparison, the highest cumulative methane emissions found in these experiments corresponded to only approximately 2% of the biochemical methane potential of lactating cow manure reported in other studies [35,59]. BMP measurements were conducted to measure the maximum methane production from these samples.…”

Section: Dairy Manurementioning

confidence: 71%

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Hilgert

Amon

et al. 2022

Sustainability

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Livestock production contributes to releasing methane into the atmosphere. Liquid manure management offers significant opportunities to reduce these emissions. A better understanding of the factors controlling methane emissions from manure is necessary to select effective mitigation strategies. Our study aimed to identify the influence of storage temperature and the associated change in chemical composition on methane emissions from dairy and fattening pig manure. Storage temperature affects microbial activity and induces changes in chemical composition that are key influences in methane emissions. Dairy and fattening pig manure samples were stored at five different temperatures (5–25 °C) for 90 days in a laboratory-scale experiment to measure the methane production. The chemical composition of the slurry samples was analyzed, and the biochemical methane potential (BMP) tests were performed before and after storage. For pig manure stored at 25 °C and 20 °C, methane emissions accounted for 69.3% and 50.3% of the BMP, respectively. Maximum methane emissions for dairy slurry were observed at 25 °C but remained at a low level. Analyses of the accumulation of volatile fatty acids (VFAs) during storage are presented in few studies, this work revealed a potential inhibition of methane production, where the accumulation of VFAs was most elevated in samples stored at 20 °C and 25 °C. This partly counteracted the increase in methane emissions expected from the higher temperatures. The degree of VFA and dissociated fatty acids accumulation in dairy cattle slurry should be assessed for more accurate estimations of methane emissions from slurry stores.

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“…The total solids obtained for TSS and DSS, 0.66 and 0.41, respectively, are in the range obtained by Mitraka et al [52], where for activated sludge, they were between 0.4 and 1.2. The inoculum, substrate, and mixture presented values of volatile fatty acids less than 2000 mg/L CH 3 COOH; this indicates a non-toxic environment for methanogenic bacteria [53]. The C/N ratio was low compared to the optimal range, which should be 20-30 for anaerobic digestion [54].…”

Section: Physicochemical Characterizationmentioning

confidence: 92%

Optimizing Anaerobic Digestion at Ambient Temperatures: Energy Efficiency and Cost Reduction Potential in Panama

Deago,

Ramírez,

Espino

et al. 2023

Water

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Anaerobic digestion (AD) is usually carried out at mesophilic temperatures (25–45 °C) in most countries, whether in temperate or tropical climates, which results in the need for heat injection and consequently increases costs. In this regard, batch AD tests were conducted at 25, 28, and 35 °C, with 25 °C being the lowest ambient temperature in Panama, using thickened secondary sludge (TSS) and digested secondary sludge (DSS) from the Juan Diaz wastewater treatment plant (WWTP) to determine the Biochemical Methane Potential (BMP). The AD study generated maximum mean BMP values of 163 mL CH4/g VS for DSS and 289.72 mL CH4/g VS for codigestion at 25 °C. The BMP value of DSS at 25 °C showed that it can still be used for energy generation, using the lowest ambient temperature recorded in Panama City. Likewise, trials at 25 °C showed a 43.48% reduction in the electrical energy produced compared to that generated at 38 °C in WWTP. This results in a reduction in energy, as the use of heat could be omitted and the energy costs required for the process are covered. In this regard, the novelty of this work lies in its investigation of anaerobic digestion at ambient temperatures, which represents a departure from conventional practices that typically require higher temperatures. By exploring the feasibility of anaerobic digestion within the temperature range of 25–35 °C, this study offers a novel approach to optimizing energy efficiency and reducing costs associated with elevated temperatures.

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Assessment of the biochemical methane potential of mono- and co-digested dairy farm wastes

Cited by 20 publications

References 28 publications

The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method

The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Optimizing Anaerobic Digestion at Ambient Temperatures: Energy Efficiency and Cost Reduction Potential in Panama

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