Effect of microwave pretreatment on semi-continuous anaerobic digestion of sewage sludge

Gil, Aida; Siles, J.A.; Martín, M.A.; Chica, A.F.; Estévez-Pastor, F.S.; Toro-Baptista, E.

doi:10.1016/j.renene.2017.07.112

Cited by 75 publications

(18 citation statements)

References 20 publications

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“…However, its greatest potential in this regard is as a feedstock for anaerobic digestion to produce biogas. Currently, anaerobic digestion is one the most important sustainable treatment technologies to valorize and stabilize abundant organic waste . This treatment produces biogas and a digestate which can be used as organic amendment .…”

Section: Introductionmentioning

confidence: 99%

“…Currently, anaerobic digestion is one the most important sustainable treatment technologies to valorize and stabilize abundant organic waste. 16 This treatment produces biogas and a digestate which can be used as organic amendment. 17 The biogas is mainly composed of methane and carbon dioxide, which may be used to obtain electricity and heat.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Revalorization of grape marc waste from liqueur wine: biomethanization

Hungría

Ángel

Gil

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Grapes are one of the largest crops produced worldwide and are used mainly to produce wine, which generates a large volume of waste. Certain designations of origin, such as the Montilla‐Moriles PDO of Cordoba (Spain) produce liqueur wines at low yield. The possibility of generating by‐products from the waste during the winemaking process might provide an additional economic input. RESULTS Anaerobic digestion of grape marc waste derived from the Pedro Ximénez variety (ecological crop) was evaluated under mesophilic conditions at laboratory scale. The loads added to the reactors varied from 0.50 to 1.25 gVS (volatile solids) L−1, with an average methane production coefficient of 252 ± 31 mLSTP CH4 g−1 VSadded (STP: 0 °C, 1 atm). The highest methane rate production was found to be 47.97 ± 4.29 mLSTP CH4 L−1 h for 1.25 gVS L−1 of grape marc waste. The volatile fatty acids concentration increased, and the pH and alkalinity slightly decreased over the experimental time. Moreover, the digestate contained lower metal concentration in comparison with waste derived from nonecological crops. CONCLUSION Anaerobic digestion of Pedro Ximénez grape marc waste is feasible and might be implemented for waste management, thus reducing the large volume of waste generated. © 2018 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revalorization of grape marc waste from liqueur wine: biomethanization

Hungría

Ángel

Gil

et al. 2019

J of Chemical Tech & Biotech

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“…Based on the feedstock type and quality (e.g., biodegradability, nutrient content, inhibition components, etc.) [68][69][70][71][72], different process-engineering techniques (e.g., pretreatment, process configuration, additive dosage) can be applied [73][74][75][76][77][78]. To name one main example, compared to other organic solid wastes, the fast acidification of carbohydrates in food wastes can lead to excessive lowering of pH in AD [79].…”

Section: Anaerobic Digestionmentioning

confidence: 99%

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Tsui

Wong

2019

Waste Dispos. Sustain. Energy

145

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Municipal solid waste (MSW) management has emerged as probably the most pressing issue many governments nowadays are facing. Traditionally, Waste-to-Energy(WtE) is mostly associated with incineration, but now, with the emergence of the bioeconomy, it embraces a broader definition comprising any processing technique that can generate electricity/heat or produce a waste-derived fuel. Under the ambit of the circular economy many nations are looking for, additional effort must be made to be sure of acquiring the most updated information and paving a sustainable path for managing MSW in such a frame. In this regard, we have undertaken a critical review of various technologies, with their updated progress, involved in the exploitation of MSW as a renewable resource, along with the critical advantages and limitations on energy and material cycling for sustainable MSW management. Incineration, the most widely used method, is nowadays difficult to further apply due to its dubious reputation and social opposition. Meanwhile, to address the organic fraction of MSW which currently is mostly unrecycled and causes disposal issues, the biological approach presents an attractive option. The new emphasis of bioeconomy leads us to understand how environmental biotechnologies should be better connected/integrated for more sustainable MSW management. This article is concluded with advances of future prospects, which can serve as a timely reminder to encourage competent authorities/researchers to work towards further improvement of the present MSW management system.

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“…Lipid extraction is the step preceding biodiesel production from sewage sludge, and its performance can determine the biodiesel yield. Sewage sludge originates from diverse sewage sources and is a complicated microbial cell mixture [12], which makes it difficult to extract lipids from sewage sludge [13,14]. Several lipid extraction methods are available, and a common approach is to extract the lipids from pretreated (by dewatering and drying) sludge using organic solvents (for example toluene, hexane, methanol, ethanol, and chloroform).…”

Section: Introductionmentioning

confidence: 99%

Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment

Lee

Choi

et al. 2020

Energies

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In this study, two types of sewage sludge (primary sludge and waste activated sludge) were hydrothermally treated at 125–250 °C to enhance the lipid extraction efficiency and obtain a higher biodiesel yield. The enhanced efficiency of the lipid extraction method was compared with the efficiency of the organic solvent extraction method. The results confirmed that a hydrothermal reaction could be an appropriate option for disrupting sludge cell walls and increasing the lipid extraction from sewage sludge. The highest lipid recovery efficiency was observed at 200 °C, and the lipid recovery efficiency of primary sludge and waste activated sludge increased from 7.56% and 5.35% to 14.01% and 11.55% by weight, respectively. Furthermore, transesterified lipids, such as biodiesel from sewage sludge, mostly consist of C16 and C18 methyl esters, and have features similar to those of jatropha oil-based biodiesel. During the hydrothermal treatment, the carbon content in the sludge decreased as the carbon transformed into lipids and the lipids were extracted. The volatile matter and fixed carbon content in the solid residue decreased and increased, respectively, through chemical dehydration and decarboxylation reactions under hydrothermal reaction conditions.

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Effect of microwave pretreatment on semi-continuous anaerobic digestion of sewage sludge

Cited by 75 publications

References 20 publications

Revalorization of grape marc waste from liqueur wine: biomethanization

Revalorization of grape marc waste from liqueur wine: biomethanization

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment

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