Cosmic exergy-based ecological assessment for farmland-dairy-biogas agroecosystems in North China

Liu, Zhen; Wang, Deyun; Li, Geng; Ning, Tangyuan; Tian, Shenzhong; Hu, Hongxing; Li, Zengjia

doi:10.1016/j.jclepro.2017.05.056

Cited by 11 publications

(18 citation statements)

References 29 publications

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“…cities) excluding particular species and various economic aspects [13,20]. Rarely has eco-exergy been applied to evaluations and comparison of biomass recycling in a system [21]. The present study has been established to evaluate a closed scheme for integrated eco-agriculture systems based on the exergy analysis and energy analysis.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong Delta, Vietnam

et al. 2020

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Background Both exergy and energy analysis methodologies are used for analysing energy efficiencies in various processes, including agriculture. This study focuses on the connection of three main process components (husbandry-crop-fishpond) in a typical farming household located within an acid soil region of rural Vietnam. The concept of exergy analysis is used to underline the potential for resource efficiency in alternative processes in the agricultural system. For development of an integrated ecological system aiming towards zero emissions, the analytical methods of material cycles and energy flows utilized a set of indicators of resource efficiency in a sustainable agriculture. Results The design of the ideal integrated farming system “Agro-Industrial Zero Emissions Systems” (AIZES) can increase the system efficiency by making use of indigenous natural materials and waste reuse/recycling. Recycling waste produce energy, fish feed and fertilizer can result in a decreased environmental load of approximately half. Using exergy analysis to calculate an indicator non-renewable yield ratio (NRYR), the systems verified sustainability of agriculture production. Conclusions The farming household will be able to subsidize their fuel and electricity consumption by utilizing biogas. Surplus biogas will be distributed to proximate households, further creating sustainable goals. Biochar, created by mixing the biomass residues with local plants, will improve soil quality and pig sludge, mixed with biomass residue, will create high-quality fertilizer.

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Section: Introductionmentioning

confidence: 99%

Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong Delta, Vietnam

et al. 2020

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“…Rarely has eco-exergy been applied toevaluations and comparison of biomass recycling in a system [21]. The present study has been established to evaluate a closed scheme for integrated eco-agriculture systems based on the exergy analysis and energy analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Exergy and energy analysis methods are basically used in analysis and comparison of energy in intensive manufacturing processes. Thermodynamic methodologies manifest energy efficiency evaluation in manufacturing processes, implying exergy as well as energy balance [13,18,19,21,23,25].…”

Section: Introductionmentioning

confidence: 99%

“…Thereby, exergy loss from the system can be computed in the same unit of energy (Joules); whereas it cannot be counted in physical units. Indicators were developed from exergy analysis to evaluate the efficiency of conversing materials flows into energy in biogas-linked agricultural systems [11,21,25]. Liu et al, [21] suggested that the exergy efficiency is highly prior to the system of a big ecosystem scale which consisting of three elements farming, diary, and biogas.…”

Section: Introductionmentioning

confidence: 99%

“…Indicators were developed from exergy analysis to evaluate the efficiency of conversing materials flows into energy in biogas-linked agricultural systems [11,21,25]. Liu et al, [21] suggested that the exergy efficiency is highly prior to the system of a big ecosystem scale which consisting of three elements farming, diary, and biogas. Exergy and indicator evaluation was assessed during the sustainable agricultural development in China between 2001 and 2015 [26].…”

Section: Introductionmentioning

confidence: 99%

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Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong delta, Vietnam

Thảo

Tung²,

Thao³

et al. 2020

Preprint

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Background: Both exergy and energy analysis methodologies are used for analysing energy efficiencies in various processes, including agriculture. This study focuses on the connection of three main process components (husbandry-crop-fishpond) in a typical farming household located within an acid soil region of rural Vietnam. The concept of exergy analysis is used to underline the potential for resource efficiency in alternative processes in the agricultural system. For development of an integrated ecological system aiming towards zero-emissions, the analytical methods of material cycles and energy flows utilized a set of indicators of resource efficiency in a sustainable agriculture.Results: The design of the ideal integrated farming system “Agro-Industrial Zero Emissions Systems” (AIZES) can increase the system efficiency by making use of indigenous natural materials and waste reuse/recycling. Recycling waste produce energy, fish feed and fertilizer can result in a decreased environmental load of approximately half. Using exergy analysis to calculate an indicator non-renewable yield ratio (NRYR), the systems verified sustainability of agriculture production.Conclusions: The farming household will be able to subsidize their fuel and electricity consumption by utilizing biogas.. Surplus biogas will be distributed to proximate households, further creating sustainable goals. Biochar, created by mixing the biomass residues with local plants, will improve soil quality and pig sludge, mixed with biomass residue, will create high-quality fertilizer.

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Energetic assessment of the agricultural production system. A review

Hercher-Pasteur

Loiseau

Sinfort

et al. 2020

Agron. Sustain. Dev.

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Energy holds a key role in farm systems. Cultivation is based on the conversion of solar energy into biomass of interest. Fossil energy allows mechanized and high-yield agricultural production system, but has a strong impact on climate change, and its supply is compromised in the next decades. Energy flows stand between two worlds: while energy is a strategic component of the economy, it is also a thermodynamic state variable for describing ecosystems. This situation reemphasizes the need for energy flow analysis in farm systems. There is a great variety in the approaches used to compute energy flows at farm scales. Yet, their main characteristics and the ways they handle farm sustainability issues need to be clarified. This review identifies ten kinds of energetic approaches, i.e., (i) conventional energy analysis, (ii) pluri-energy analysis, (iii) agroecological energy analysis, (iv) exergy analysis, (v) cumulative exergy consumption, (vi) extended exergy account, (vii) cumulative exergy extraction from the natural environment, (viii) eco-exergy, (ix) cosmic exergy analysis, and (x) emergy assessment. These approaches are analyzed through key features to discuss their ability to address resources' efficiency issues and identify promising outcomes for energy assessment of farms. This analysis emphasizes the lack of clear definition of system boundaries in farm-scale studies. In addition, most of the studies mainly focus on socio-economic flows through a sectoral perspective. Yet, internal biomass flows that play a role in maintaining agroecosystem functionality can also be considered according to a circular/systemic perspective. Then, integration of soil organic matter in the energy balance leads to significant changes in energy efficiency evaluation playing a function of biotic energy storage in the farm system. Hence, some recommendations are provided to perform an exhaustive energetic assessment of farm systems as well as future lines of research to be investigated.

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Cosmic exergy-based ecological assessment for farmland-dairy-biogas agroecosystems in North China

Cited by 11 publications

References 29 publications

Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong Delta, Vietnam

Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong Delta, Vietnam

Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong delta, Vietnam

Energetic assessment of the agricultural production system. A review

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