On the Spent Coffee Grounds Biogas Production

Abstract

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 m 3 /kg dry organic matter.

Valorization of spent coffee grounds recycling as a potential alternative fuel resource in Turkey: An experimental study

“…Anaerobic digestion or co-digestion has been proposed as an alternative to composting to produce biogas from SCG (Caetano et al, 2014;Dinsdale et al, 1996;Neves et al, 2006;Vítěz et al, 2016). Moreover, antioxidant and antitumor activities were recently report in SCG (Acevedo et al, 2013).…”

“…It is believed that 34.1% of waste are recycled or composted, whereas 11.7% are combusted for energy and 54.2% are landfilled (Figure 1) (U.S. Environmental Protection Agency [EPA], 2017). Current legislation and zero-waste strategy demand finding appropriate technologies for the treatment waste (Vítěz et al, 2016).…”

Adsorption of Ni2+ and Cd2+ from Water by Calcium Alginate/Spent Coffee Grounds Composite Beads

“…The coffee spent grounds are a pollutant by themselves and most of them are wasted in landfills. Spent coffee grounds are discarded into landfills and they create methane, which is a greenhouse gas [13]. The chemical composition of SCGs is based on hemicellulose, cellulose, fat, proteins, polyphenols, minerals, and products from Maillard reaction during the roasting process, such as melanoidins [13].…”

“…Spent coffee grounds are discarded into landfills and they create methane, which is a greenhouse gas [13]. The chemical composition of SCGs is based on hemicellulose, cellulose, fat, proteins, polyphenols, minerals, and products from Maillard reaction during the roasting process, such as melanoidins [13]. Major components of the SCGs, namely polysaccharides cellulose and hemicellulose, and the polymeric compound lignin can be used to remove heavy metals from water because they have functional groups as −OH, −COOH and phenolic groups which are able to adsorb heavy metals from aqueous solutions.…”

The Possibility of Using Spent Coffee Grounds to Improve Wastewater Treatment Due to Respiration Activity of Microorganisms

“…Microorganisms can isomerize, hydrolyze, or degrade them into low-weight molecular compounds. On the other hand, high concentrations of phenolic compounds have an adverse effect on anaerobic microorganisms, which may cause problems at the processing of biodegradable waste in biogas transformation technologies [19][20][21][22]. Phenolic compounds are a major cause of digestive failures in anaerobic digestion [23].…”