Renewability and sustainability of biogas system: Cosmic exergy based assessment for a case in China

Chen, G.Q.; Wu, Xudong; Yang, Qing; Alsaedi, Ahmed; Hayat, Tasawar; Ahmad, Bashir

doi:10.1016/j.rser.2015.07.051

Cited by 46 publications

(10 citation statements)

References 64 publications

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“…By contrast with common economic analysis methods, biophysical methods consider the contribution of environmental services and inputs in production systems . Biophysical methods are based on the thermodynamic theory, including life cycle assessment, energy analysis, emergy synthesis, exergy analysis, and other hybrid methods . These methods have their own merits and demerits, and they can solve problems from different aspects.…”

Section: Introductionmentioning

confidence: 99%

Sustainability accounting for the construction and operation of a plant‐scale solar‐biogas heating system based on emergy analysis

et al. 2019

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Summary Domestic heating systems have long been playing a significant role in China's energy structure. The sustainability of a hybrid solar‐biogas heating system (SBHS) under various feedstock fermentation scenarios was evaluated using emergy analysis. Representative emergy indices such as transformities, emergy yield ratio (EYR), environmental loading ratio (ELR), emergy sustainability index (ESI), ratio of waste treatment (%W), feedback yield ratio (FYR), and emission mitigation intensity (EMI; g/1010 sej) were selected to evaluate the sustainability performance of different feedstock scenarios including cow dung (CD), swine manure (SM), and poultry manure (PM). The results showed that PM fermentation scenario had greater market competitiveness, lower environmental pressure, better sustainability, and self‐organizing ability than the other two options. However, both the emergy efficiency and the CO2 emissions mitigation intensity of PM scenario were worse than that of the SM and CD. Moreover, compared with other biogas systems and traditional agricultural systems, the hybrid SBHS was proved to be a promising mode for the treatment of rural manure waste with favorable economic benefits and environmental sustainability.

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Section: Introductionmentioning

confidence: 99%

Sustainability accounting for the construction and operation of a plant‐scale solar‐biogas heating system based on emergy analysis

et al. 2019

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“…Stougie and van der Kooi (2012) studied exergy and sustainability by addressing exergy loss as a qualitative measure of environmental effects. Wu et al (2015) used cosmic exergy to assess the sustainability of biogas systems. Chen et al used extended-exergy analysis to study the sustainability of Chinese societal system (Chen and Chen, 2009) and Chinese biogas project (Yang and Chen, 2014).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Sustainability of Fuel from the Viewpoint of Exergy

Zhang

Zhao

et al. 2018

European Journal of Sustainable Development Research

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At the same time of providing a huge amount of energy to the world population (social sustainability) and global economy (economic sustainability), the fuel itself also releases a great amount of emissions to the environment the world people live in in the forms of gaseous pollutants (SOx, NOx, CO, CO2, CH4, etc.) and ash compositions (Al2O3, CaO, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SO3, SiO2, TiO2, etc.), seriously impacting the environment (environmental sustainability) for the world population and global economy. Sustainability generally encompasses economic sustainability, environmental sustainability, and social sustainability, and all of these are significantly related to the energy/resource sustainability. This study addresses the sustainability of fuel from the viewpoint of exergy. It is demonstrated that the energy of a fuel is best evaluated by its chemical exergy, and the environmental impact of a fuel can be assessed through the chemical exergy of its emissions (the specific impacts such as toxicity or greenhouse effect are not detailed). Then, the sustainability of fuel can be understood from the viewpoint of exergy through three ways: (a) high chemical exergy of the fuel, (b) high exergy efficiency of the fuel conversion process, and (c) low chemical exergy of the emissions.

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“…According to a Chinese renewable energy report, approximately 100,000 large-scale biogas-engineering projects were constructed in 2013 (Wu et al 2015). However, a large amount of biogas slurry produced from these projects is not treated appropriately, which can cause secondary pollutions to soil and water (Bian et al 2014;Wentzel et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Production of Bioflocculants Prepared from Wastewater Supernatant of Anaerobic Co-Digestion of Corn Straw and Molasses Wastewater Treatment

Zhao

Sun

et al. 2017

BioResources

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a Novel bioflocculants (BS-MBF) were prepared using the wastewater supernatant from anaerobic co-digestion of corn straw and molasses wastewater as a nutrient resource. Acetic acid and ethanol were the dominant fermentation products during the anaerobic digestion process and were estimated to be 50.5% and 30.0%, respectively, after 150 d of operation. Equal volumes of bioflocculant producing bacteria F2 (Rhizobium radiobacter) and F6 (Bacillus sphaericus) were mixed to form F + , which was inoculated to wastewater supernatant at different times. A maximum flocculation activity of 91.3% was achieved, and 2.32 g/L of purified bioflocculant was extracted when a compound medium from 110-d wastewater supernatant was used. The removal efficiencies of heavy metals from simulated electroplating wastewater were tested by using these prepared bioflocculants. The optimal conditions for heavy metal removal to BS-MBF were found to be at 374 mg/L at an initial pH of 6.0 and a contact time of 40 min. The adsorption capacities for Cu 2+ and Zn 2+ reached more than 90%, while for Cr 6+ it reached approximately 30%. Overall, the study showed for the first time that wastewater supernatant from anaerobic co-digestion of corn straw and molasses wastewater can be used for producing bioflocculants, which can be effectively used to remove heavy metals from electroplating wastewater.

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Renewability and sustainability of biogas system: Cosmic exergy based assessment for a case in China

Cited by 46 publications

References 64 publications

Sustainability accounting for the construction and operation of a plant‐scale solar‐biogas heating system based on emergy analysis

Sustainability accounting for the construction and operation of a plant‐scale solar‐biogas heating system based on emergy analysis

Understanding the Sustainability of Fuel from the Viewpoint of Exergy

Production of Bioflocculants Prepared from Wastewater Supernatant of Anaerobic Co-Digestion of Corn Straw and Molasses Wastewater Treatment

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