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

Spent coffee ground (SCG) may affect wastewater treatment processes due to high coffee consumption worldwide. The impact of the main chemical compounds present in SCG on respiration activity of sewage sludge was investigated. The results showed approximately two times higher respiration in the samples where various types of SCG were present in comparison with samples without SCG. During intense microbial metabolism, statistically significant (p < 0.05) decreases in caffeine, total polyphenols, and chlorogenic acid contents after processing and in filtrate was observed. The monitored compounds (caffeine, polyphenols, and chlorogenic acid) deteriorated due to their probable inclusion in microbiological metabolism. Increase in respiration activity of microorganisms in the presence of cheap waste material such as coffee grounds can help to improve wastewater treatment. The research was focused on spent coffee grounds’ impact on the respiratory activity of microorganisms in the activated sludge taken from small and large wastewater treatment plants. The impact was measured in more detail due to the inclusion of different coffee species (Robusta and Arabica) in diverse concentrations. The novelty of the study can also be seen through the literature overview, where information cannot be found about SCG influence on the respiration activity of microbial communities, and data on the possible SCG aerobic degradation or utilization by a sewage sludge bacterial consortium has also never been reported. The study has shown the possibility of improving wastewater treatment due to respiration activity of microorganisms in the presence of cheap waste material such as coffee grounds.

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3D printing of spent coffee ground derived biochar reinforced epoxy composites

Journal of Composite Materials ◽

10.1177/00219983211002237 ◽

2021 ◽

pp. 002199832110022

Author(s):

Ahmed Alhelal ◽

Zaheeruddin Mohammed ◽

Shaik Jeelani ◽

Vijaya K Rangari

Keyword(s):

3D Printing ◽

Flexural Modulus ◽

Flexural Properties ◽

Direct Write ◽

Thermal And Mechanical Properties ◽

Spent Coffee Grounds ◽

Coffee Grounds ◽

Spent Coffee Ground ◽

Coffee Ground ◽

3D Printed

Semi-crystalline carbon biochar is derived from spent coffee grounds (SCG) by a controlled pyrolysis process at high temperature/pressure conditions. Obtained biochar is characterized using XRD, SEM, and TEM techniques. Biochar particles are in the micrometer range with nanostructured morphologies. The SCG biochar thus produced is used as reinforcement in epoxy resin to 3 D print samples using the direct-write (DW) method with 1 and 3 wt. % loadings. Rheology results show that the addition of biochar makes resin viscous, enabling it to be stable soon after print; however, it could also lead to clogging of resin in printer head. The printed samples are characterized for chemical, thermal and mechanical properties using FTIR, TGA, DMA and flexure tests. Storage modulus improved with 1 wt. % biochar addition up to 27.5% and flexural modulus and strength increased up to 55.55% and 43.30% respectively. However, with higher loading of 3 wt. % both viscoelastic and flexural properties of 3D printed samples drastically reduced thus undermining the feasibility of 3D printing biochar reinforced epoxies at higher loadings.

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Effect of Cellulases, Solvent Type and Particle Size Distribution on the Extraction of Chlorogenic Acid and Other Phenols from Spent Coffee Grounds

American Journal of Food Technology ◽

10.3923/ajft.2007.641.651 ◽

2007 ◽

Vol 2 (7) ◽

pp. 641-651 ◽

Cited By ~ 20

Author(s):

Manuel Pinelo ◽

Abigaille G. Tress ◽

Mads Pedersen ◽

Anis Arnous ◽

Anne S. Meyer

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Chlorogenic Acid ◽

Size Distribution ◽

Spent Coffee Grounds ◽

Solvent Type ◽

Coffee Grounds

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Biodiesel Production from Spent Coffee Grounds

Research Papers Faculty of Materials Science and Technology Slovak University of Technology ◽

10.1515/rput-2017-0013 ◽

2017 ◽

Vol 25 (40) ◽

pp. 113-121 ◽

Cited By ~ 3

Author(s):

Lenka Blinová ◽

Alica Bartošová ◽

Maroš Sirotiak

Keyword(s):

Organic Solvents ◽

Oil Extraction ◽

Waste Material ◽

Biodiesel Production ◽

Spent Coffee Grounds ◽

Drying Oil ◽

Biodiesel Feedstock ◽

Coffee Grounds ◽

Coffee Oil

Abstract The residue after brewing the spent coffee grounds is an oil-containing waste material having a potential of being used as biodiesel feedstock. Biodiesel production from the waste coffee grounds oil involves collection and transportation of coffee residue, drying, oil extraction, and finally production of biodiesel. Different methods of oil extraction with organic solvents under different conditions show significant differences in the extraction yields. In the manufacturing of biodiesel from coffee oil, the level of reaction completion strongly depends on the quality of the feedstock oil. This paper presents an overview of oil extraction and a method of biodiesel production from spent coffee grounds.

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Utilization of sewage sludge ashes in the brick and tile industry

Water Science & Technology ◽

10.2166/wst.1997.0418 ◽

1997 ◽

Vol 36 (11) ◽

pp. 251-258 ◽

Cited By ~ 26

Author(s):

Bernd Wiebusch ◽

Carl Franz Seyfried

Keyword(s):

Heavy Metals ◽

Wastewater Treatment ◽

Chemical Composition ◽

Sewage Sludge ◽

Treatment Methods ◽

Sludge Incineration ◽

Brick And Tile ◽

The Impact

Several aspects of using ashes from sewage sludge incineration in the brick and tile industry have been examined. After discussing the item of ash production in Germany, the impact of different wastewater treatment methods is described; for instance, the use of precipitation agents containing iron will considerably influence the ash quality. Depending on their respective chemical composition, different ashes have different effects on the ceramic qualities of the bricks made of clay blended with ashes. These effects will be shown in regard to the major ceramic parameters. Similarly, the quality of the ashes also influences the elution behaviour and the mineral fixation of heavy metals.

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Use of wheat flour and spent coffee grounds in the production of cookies with high fiber and antioxidant content: Effects of spent coffee grounds ratio on the product quality

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/947/1/012044 ◽

2021 ◽

Vol 947 (1) ◽

pp. 012044

Author(s):

Trấn Thi Thu Trà ◽

Lê Nguyên Phúc ◽

Võ Thi Ngoc Yến ◽

Lê Thánh Sang ◽

Nguyễn Thi Anh Thu ◽

...

Keyword(s):

Dietary Fiber ◽

Wheat Flour ◽

Composite Flour ◽

Spent Coffee Grounds ◽

High Fiber ◽

Overall Acceptability ◽

Antioxidant Content ◽

Coffee Grounds ◽

Sensory Score ◽

Spent Coffee Ground

Abstract Spent coffee ground (SCG) is the main by-product of the instant coffee industry. In this study, wheat flour and dried SCG powder were used in the production of cookies with high fiber and antioxidant content. The objective of the study was to evaluate the effects of SCG ratio in the cookie formulation on nutritional quality, physical properties and sensory overall acceptability of the product. SCG is a rich source of dietary fiber. In 100 g dry weight of SCG, the total fiber and phenolic contents were 76.6 ± 0.58% and 3828±12 mg GAE/100g dry basis, respectively. When the SCG ratio increased from 0 to 0.25 of the composite flour weight, the dough had increased hardness and reduced adhesiveness, cohesiveness and springiness. An increase in the SCG ratio in the cookie formulation also decreased the diameter and thickness of the product but enhanced its hardness. Cookie samples supplemented with SCG had higher dietary fiber and phenolic content as well as a higher antioxidant activity than the control sample. Cookie samples were considered as high fiber food when the SCG ratio was 0.1 or higher. The use of SCG reduced the overall acceptability of cookies. When the ratio of SGC powder varied from 0.1 to 0.2, a sensory score of the obtained cookies was acceptable.

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Extrusion Compounding Process for the Development of Eco-Friendly SCG/PP Composite Pellets

Sustainability ◽

10.3390/su11061720 ◽

2019 ◽

Vol 11 (6) ◽

pp. 1720 ◽

Cited By ~ 2

Author(s):

Joo Sohn ◽

Youngjae Ryu ◽

Chang-Seok Yun ◽

Kun Zhu ◽

Sung Cha

Keyword(s):

Mechanical Properties ◽

Injection Molding ◽

Waste Biomass ◽

Spent Coffee Grounds ◽

Coffee Grounds ◽

Petroleum Resources ◽

Composite Pellets ◽

Resource Circulation ◽

American Society ◽

The Impact

As the consumption of coffee increases worldwide, the amount of spent coffee grounds (SCG) is gradually increasing every year. Some of these grounds are recycled for composting, but most are discarded, which causes widespread financial and social costs. We developed a bio-based plastic pellet by blending polypropylene (PP) with waste biomass SCG to convert it into a sustainable, recyclable eco-friendly material. It was confirmed that extrusion compounding for SCG/PP composite pellets and injection molding with good formability are possible. To evaluate the formability of the composite pellets, American Society for Testing and Materials (ASTM) test specimens were prepared for evaluating mechanical properties by injection molding. As a result of the measurement of the test samples, the mechanical properties of SCG/PP composite pellets were generally lowered as the SCG content increased. However, the impact strength of SCG/PP composite based on the HOMO-PP matrix improved as the SCG content increased. In addition, Young’s modulus of SCG/PP increased as the SCG content increased. In the future, this study will be applied to manufacture of products that requires non-toxic products, such as disposable products and food containers, realizing commercialization of eco-friendly products and thereby replacing finite petroleum resources and practicing resource circulation and environmental protection.

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Co-combustion Kinetics and Synergistic Characteristics of Sewage Sludge and Spent Coffee Grounds

Heat Transfer Research ◽

10.1615/heattransres.2021034708 ◽

2021 ◽

Author(s):

Min Ruan ◽

Zhihao Zeng ◽

Jing Huang ◽

Yutong Sun ◽

Xikai Wu ◽

...

Keyword(s):

Sewage Sludge ◽

Combustion Kinetics ◽

Spent Coffee Grounds ◽

Coffee Grounds

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Pollution of underground water—a computational case study using a transport model

Journal of Hydroinformatics ◽

10.2166/hydro.2002.0025 ◽

2002 ◽

Vol 4 (4) ◽

pp. 255-263 ◽

Cited By ~ 1

Author(s):

Katalin Balla ◽

Gerzson Kéri ◽

Tamás Rapcsák

Keyword(s):

Sewage Sludge ◽

Transport Model ◽

Relevant Literature ◽

Underground Water ◽

Waste Material ◽

Aluminium Dross ◽

Basic Ideas ◽

The Impact ◽

Sludge Composting

Damage of the waterproofing system in a waste material depository or sewage sludge composting plant and the penetration of pollutants into the soil and groundwater may cause an environmental mishap. Although the standard waterproofing technologies are extremely safe, one cannot disregard possible malfunctions. For a well-established plan of managing unexpected events, the impact of such damage must be forecast. With the help of models described in the relevant literature, we propose the basic ideas used in simulations for two planned regional waste material depositories, a planned sewage sludge composting plant and an active aluminium dross depository of a foundry.

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Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

10.21203/rs.3.rs-1035447/v1 ◽

2021 ◽

Author(s):

Enrique Terroba-Delicado ◽

Stefano Fiori ◽

Sergio Torres-Giner ◽

Jaume Gomez-Caturla ◽

Nestor Montanes ◽

...

Keyword(s):

Lactic Acid ◽

Chemical Interaction ◽

Extrusion Process ◽

Green Composites ◽

Green Composite ◽

Spent Coffee Grounds ◽

Reinforcing Fillers ◽

Coffee Grounds ◽

Coffee Oil ◽

The Impact

Abstract This work puts the Circular Bioeconomy’s concept into action, originally valorizing residues from the beverage liquor coffee industry into reinforcing fillers for green composites of polylactide (PLA). The as-received spent coffee grains derived from liquor waste were first milled to obtain the so-called spent coffee grounds (SCGs), which were then incorporated at 20 wt.% into PLA by extrusion. With the aim of improving the compatibility between the biopolyester and the lignocellulosic particles, two oligomers of lactic acid (OLAs), namely OLA2 and OLA2mal, being the latter functionalized with maleic anhydride (MAH), were both added during the extrusion process at 10 wt.%. The resultant compounded pellets were finally shaped into pieces by injection molding for characterization. Results showed that, as opposite to most claims published in the literature of PLA composites based on lignocellulosic fillers derived from soluble coffee wastes, the incorporation of liquor waste derived SCGs increased the ductility of the pieces by nearly 280% due to their high coffee oil content. The incorporation of OLA2 and OLA2mal contributed to improve the impact strength of the pieces by approximately 6% and 12.6%, respectively. The higher performance of OLA2mal was ascribed to a reduction of crystallinity in the green composite due to the chemical interaction by the MAH groups. However, the incorporation of SCGs into PLA slighlty reduced the thermal stability and yielded a dark-to-brown color, whereas it also delayed the disintegration rate of the pieces in controlled compost soil. Therefore, the results attained herein open up novel opportunities for the development of green composites of PLA with higher ductility and toughness through the valorization of liquor coffee wastes.

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