Economic analysis of renewable heat and electricity production by sewage sludge digestion-a case study

Fersi, Soukaina; Chtourou, Nouri; Jury, Colin; Poncelet, F.J.

doi:10.1002/er.3234

Cited by 14 publications

(7 citation statements)

References 33 publications

(58 reference statements)

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“…As a result, there is a 55 critical scale of biogas production above which biogas utilisation can be economically 56 feasible. This critical threshold can be overcome through the use of co-digestion of the 57 sewage sludge with concentrated organic wastes (Fersi et al, 2014;Silvestre et al, 2015). 58…”

Section: Introduction 34mentioning

confidence: 99%

Biomethane potential evaluation of co-digestion of sewage sludge and organic wastes

Wickham

Galway

Bustamante

et al. 2016

International Biodeterioration & Biodegradation

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Co-digestion of organic rich wastes and wastewater sludge to enhance biogas production has become an attractive economic possibility for water utilities. The suitability of the organic rich waste depends on its ability to produce biogas as well as its influence on the overall anaerobic digestion process. Biomethane potential evaluation was conducted to screen seven organic wastes and dehydrated algae. All co-substrates increased the bio-methane yield by three to six times compared with conventional anaerobic digestion of sewage sludge. Maximum co-digestion ratios were identifiable for most solid co-substrates including algae (6% wt/wt), undiluted food waste (5% wt/wt), bakery waste (5% wt/wt), and diluted commercial food waste (10% wt/wt). On the other hand, the maximum co-digestions ratio of beverage reject and sewage sludge was 10% (wt/wt). With the exception of fat-oil-grease, all solids free liquid co-substrates evaluated in this study showed a notable synergistic effect, to enhanced removals of total solids, volatile solids (VS) and chemical oxygen demand (COD) during anaerobic digestion. The increase in COD removal when co-digesting wastewater sludge and liquid waste was from 2 to 41%. Conversely, the co-digestion of most solid cosubstrates resulted in additional VS and COD residuals in the final biosolids. Elevated concentrations of sulphur and phosphorous in all food waste co-substrates suggest that control measures to address H2S in biogas and the accumulation of phosphorus in sludge centrate may be necessary during full scale operation. Data presented here provide the basis for subsequent pilot scale evaluation of anaerobic digestion of these organic rich wastes and wastewater sludge. Co-digestion of organic rich wastes and wastewater sludge to enhance biogas production has 12 become an attractive economic possibility for water utilities. The suitability of the organic 13 rich waste depends on its ability to produce biogas as well as its influence on the overall 14 anaerobic digestion process. Biomethane potential evaluation was conducted to screen seven 15 organic wastes and dehydrated algae. All co-substrates increased the bio-methane yield by 16 three to six times compared with conventional anaerobic digestion of sewage sludge. 17Maximum co-digestion ratios were identifiable for most solid co-substrates including algae 18 (6% wt/wt), undiluted food waste (5% wt/wt), bakery waste (5% wt/wt), and diluted 19 commercial food waste (10% wt/wt). On the other hand, the maximum co-digestions ratio of 20 beverage reject and sewage sludge was 10% (wt/wt). With the exception of fat-oil-grease, all 21 liquid co-substrates evaluated in this study showed a notable synergistic effect, to enhanced 22 removals of total solids, volatile solids (VS) and chemical oxygen demand (COD) during 23 anaerobic digestion. The increase in COD removal when co-digesting wastewater sludge and 24 liquid waste was from 2 to 41%. Conversely, the co-digestion of most solid co-substrates 25 resulted in additional VS and COD resi...

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Section: Introduction 34mentioning

confidence: 99%

Biomethane potential evaluation of co-digestion of sewage sludge and organic wastes

Wickham

Galway

Bustamante

et al. 2016

International Biodeterioration & Biodegradation

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“…59 Renewable energy must be both environmentally favorable and economically competitive to draw investors' attention. 60 Despite the fact that alternative energy's positive influence on climate change alleviation is an undeniable truth, many projects currently require high capital and/or operating expenditures.…”

Section: Economic Analysismentioning

confidence: 99%

Life Cycle and Economic Assessment of Anaerobic Co-digestion of Dairy Manure and Food Waste

Chen

Rojas-Downing

Zhong

et al. 2015

Industrial Biotechnology

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A comprehensive life cycle and financial analysis was conducted to evaluate the environmental and economic performance of an anaerobic co-digestion system for dairy manure and food wastes versus a control system that anaerobically digests dairy manure but landfills food wastes. The environmental impacts of co-digestion are lower than the control system for global warming (66.95%), water eutrophication (18.88%), and smog emission (68.93%), but higher for air acidification (39.38%). Co-digestion results in a net energy ratio that is 1.67 times higher than the control system. An economic analysis revealed that co-digestion is more profitable, as the calculated 25-year net value of over $8.4 million is far superior to the -$7.5 million for the control system. Considering both environmental impacts and economic indicators, manure and food waste co-digestion is a preferable solution for waste management and bioenergy production.

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“…The framework conditions of organic biogas generation and its monetary implications on production economics must be carefully analysed [8] and [9], with risks evaluation [10]. Renewable energy production is not economically viable by its own, without considering the wastewater treatment function and the associated incomes [11].…”

Section: Economic Forecast Of a Biogas Plant Projectmentioning

confidence: 99%

Economy of Biogas Plants

Kremljak¹

2017

DAAAM Proceedings

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At a time when worldwide energy demand grows, the care for greener environment grows as well. Due to the extremely high energy potential, along the safety and cleanness of its operations, the biogas plant as an energy solution is deemed a great investment in the future. Frequently in that regard we face the question concerning the scope of the investment and the time needed for its return. This paper gives an example of an investment in a biogas plant and the exploitation of renewable sources, which is simultaneously an example of circular economy. The biogas plant has a power of 1 MW, which along the existing concession prices and the resulting economy justifies the validity of the decision to invest while ensuring a cleaner environment. Invested funds shall be returned within a maximum of 6 years, reflecting the extremely dynamic business process.

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Economic analysis of renewable heat and electricity production by sewage sludge digestion-a case study

Cited by 14 publications

References 33 publications

Biomethane potential evaluation of co-digestion of sewage sludge and organic wastes

Biomethane potential evaluation of co-digestion of sewage sludge and organic wastes

Life Cycle and Economic Assessment of Anaerobic Co-digestion of Dairy Manure and Food Waste

Economy of Biogas Plants

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