Anaerobic digestion of hydrothermal liquefaction wastewater from spent coffee grounds

Due to the strict legislation currently in use for landfilling, anaerobic digestion has a strong potential as an alternative treatment for biodegradable waste. Coffee is one of the most consumed beverages in the world and spent coffee grounds (SCG) are generated in a considerable amount as a processing waste during making the coffee beverage. Chemical composition of SCG, presence of polysaccharides, proteins, and minerals makes from the SCG substrates with high biotechnological value, which might be used as valuable input material in fermentation process. The methane production ranged from 0.271–0.325 m3/kg dry organic matter.

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Anaerobic digestion of spent coffee grounds

Biomass ◽

10.1016/0144-4565(83)90017-3 ◽

1983 ◽

Vol 3 (4) ◽

pp. 247-268 ◽

Cited By ~ 38

Author(s):

A.G. Lane

Keyword(s):

Anaerobic Digestion ◽

Spent Coffee Grounds ◽

Coffee Grounds

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Hydrothermal liquefaction of spent coffee grounds in water medium for bio-oil production

Biomass and Bioenergy ◽

10.1016/j.biombioe.2016.02.005 ◽

2016 ◽

Vol 86 ◽

pp. 191-198 ◽

Cited By ~ 53

Author(s):

Linxi Yang ◽

Laleh Nazari ◽

Zhongshun Yuan ◽

Kenneth Corscadden ◽

Chunbao (Charles) Xu ◽

...

Keyword(s):

Oil Production ◽

Hydrothermal Liquefaction ◽

Water Medium ◽

Spent Coffee Grounds ◽

Coffee Grounds ◽

Bio Oil

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A Comparison of Batch Extracted Bio-oil and Continuous Hydrothermal Liquefaction Bio-oil using Spent Coffee Grounds as Biomass Feedstock

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) ◽

10.17758/eares4.eap1118262 ◽

2018 ◽

Keyword(s):

Hydrothermal Liquefaction ◽

Biomass Feedstock ◽

Spent Coffee Grounds ◽

Coffee Grounds ◽

Bio Oil

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Ulva biomass as a co-substrate for stable anaerobic digestion of spent coffee grounds in continuous mode

Bioresource Technology ◽

10.1016/j.biortech.2017.06.012 ◽

2017 ◽

Vol 241 ◽

pp. 1182-1190 ◽

Cited By ~ 9

Author(s):

Jaai Kim ◽

Hakchan Kim ◽

Changsoo Lee

Keyword(s):

Anaerobic Digestion ◽

Continuous Mode ◽

Spent Coffee Grounds ◽

Coffee Grounds

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An alternative biorefinery approach to address microalgal seasonality: blending with spent coffee grounds

Sustainable Energy & Fuels ◽

10.1039/d0se00164c ◽

2020 ◽

Vol 4 (7) ◽

pp. 3400-3408 ◽

Cited By ~ 1

Author(s):

Andre Prates Pereira ◽

Tao Dong ◽

Eric P. Knoshaug ◽

Nick Nagle ◽

Ryan Spiller ◽

...

Keyword(s):

Hydrothermal Liquefaction ◽

Spent Coffee Grounds ◽

Carbohydrate Fraction ◽

Coffee Grounds ◽

Fuels And Chemicals

An effective method for the production of fuels and chemicals from microalgae is to ferment the carbohydrate fraction, extract the lipids and convert the resulting solids through hydrothermal liquefaction (HTL).

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A Comparative Study on Thermochemical Valorization Routes for Spent Coffee Grounds

Energies ◽

10.3390/en14133840 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3840

Author(s):

Jie Yang ◽

Hao Chen ◽

Haibo Niu ◽

Josiah McNutt ◽

Quan He

Keyword(s):

Oil Extraction ◽

Hydrothermal Liquefaction ◽

Biodiesel Production ◽

Optimal Conditions ◽

Spent Coffee Grounds ◽

Microwave Assisted ◽

Assisted Extraction ◽

Coffee Grounds ◽

Biodiesel Synthesis ◽

Biochemical Compositions

Extracting oil from spent coffee grounds (SCG) for biodiesel production has recently attracted much research interest. Large amounts of organic solvents are involved for oil extraction and biodiesel synthesis. Hydrothermal liquefaction (HTL) is an emerging thermochemical technology with great potential for biocrude production from a broad range of feedstocks. This study attempted to compare two SCG valorization options: route 1, oil extraction for biodiesel production followed by HTL of defatted SCG; and route 2, direct HTL of raw SCG. The microwave-assisted extraction conditions were optimized to effectively remove oil from SCG using response surface methodology. Under optimal conditions, an SCG oil yield of 8.4 wt.% could be achieved. HTL of defatted SCG generated less biocrude (18.9 wt.%) than that of raw SCG (28.1 wt.%). The biochemical compositions of resultant biocrudes were largely different from each other. The life cycle assessment was conducted on each of the SCG valorization routes and showed that the greenhouse gas emissions from direct HTL of raw SCG were only 35% of the other valorization route, suggesting that direct HTL is a favorable valorization route for SCG within this study’s scope.

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