scholarly journals Anaerobic Codigestion of Food Waste and Polylactic Acid: Effect of Pretreatment on Methane Yield and Solid Reduction

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Shakira R. Hobbs ◽  
Prathap Parameswaran ◽  
Barbara Astmann ◽  
Jay P. Devkota ◽  
Amy E. Landis
Keyword(s):  
Anaerobic Digestion ◽  
Polylactic Acid ◽  
Food Waste ◽  
Alkaline Treatment ◽  
Alkaline Pretreatment ◽  
Digested Sludge ◽  
Acid Effect ◽  
Anaerobic Codigestion ◽  
Methane Potential ◽  
Set Up

Food waste and biopolymers, plastics derived from plants, are unexploited sources of energy when discarded in landfills without energy recovery. In addition, polylactic acid (PLA) and food waste have complimentary characteristics for anaerobic digestion; both are organic and degrade under anaerobic conditions. Lab-scale reactors were set up to quantify the solubilization of pretreated amorphous and crystalline PLA. Biochemical methane potential (BMP) assays were performed to quantify CH4 production from both treated and untreated PLA in the presence of food waste and anaerobic digested sludge. Amorphous and crystalline PLA reached near-complete solubilization at 97% and 99%, respectively, when alkaline pretreatment was applied. The PLA that received alkaline treatment produced the most of CH4 throughout the run time of 70 days. The PLA without treatment resulted in 54% weight reduction after anaerobic digestion. Results from this study show that alkaline pretreatment has the greatest solid reduction of PLA and maximum production of CH4 when combined with food waste and anaerobic digested sludge.

scholarly journals Impact of pH Management Interval on Biohydrogen Production from Organic Fraction of Municipal Solid Wastes by Mesophilic Thermophilic Anaerobic Codigestion

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Chaudhry Arslan ◽  
Asma Sattar ◽  
Ji Changying ◽  
Abdul Nasir ◽  
Irshad Ali Mari ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Solid Wastes ◽  
Biohydrogen Production ◽  
Organic Fraction ◽  
Municipal Solid Wastes ◽  
Anaerobic Codigestion ◽  
Ph Management

The biohydrogen productions from the organic fraction of municipal solid wastes (OFMSW) were studied under pH management intervals of 12 h (PM12) and 24 h (PM24) for temperature of37±0.1°C and55±0.1°C. The OFMSW or food waste (FW) along with its two components, noodle waste (NW) and rice waste (RW), was codigested with sludge to estimate the potential of biohydrogen production. The biohydrogen production was higher in all reactors under PM12 as compared to PM24. The drop in pH from 7 to 5.3 was observed to be appropriate for biohydrogen production via mesophilic codigestion of noodle waste with the highest biohydrogen yield of 145.93 mL/gCODremovedunder PM12. When the temperature was increased from 37°C to 55°C and pH management interval was reduced from 24 h to 12 h, the biohydrogen yields were also changed from 39.21 mL/gCODremovedto 89.67 mL/gCODremoved, 91.77 mL/gCODremovedto 145.93 mL/gCODremoved, and 15.36 mL/gCODremovedto 117.62 mL/gCODremovedfor FW, NW, and RW, respectively. The drop in pH and VFA production was better controlled under PM12 as compared to PM24. Overall, PM12 was found to be an effective mean for biohydrogen production through anaerobic digestion of food waste.

scholarly journals Enhancing anaerobic digestion of food waste through biochemical methane potential assays at different substrate: inoculum ratios

2018 ◽  
Vol 71 ◽  
pp. 612-617 ◽  
Author(s):  
Shakira R. Hobbs ◽  
Amy E. Landis ◽  
Bruce E. Rittmann ◽  
Michelle N. Young ◽  
Prathap Parameswaran
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Biochemical Methane Potential ◽  
Methane Potential

scholarly journals Anaerobic Codigestion of Sugarcane Press Mud with Food Waste: Effects on Hydrolysis Stage, Methane Yield, and Synergistic Effects

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Lina M. Cárdenas-Cleves ◽  
Luis F. Marmolejo-Rebellón ◽  
Patricia Torres-Lozada
Keyword(s):  
Food Waste ◽  
Synergistic Effects ◽  
Environmental Benefits ◽  
Lag Phase ◽  
Press Mud ◽  
Limiting Stage ◽  
Anaerobic Codigestion ◽  
Methane Potential ◽  
Bmp Test ◽  
The Stability

Sugarcane press mud (SPM) has a high potential to produce renewable energy through anaerobic digestion (AD); however, hydrolysis is the limiting stage of the process due to the presence of slowly biodegradable compounds. An alternative that can improve this deficiency is anaerobic codigestion (AcoD). In this investigation, the monodigestion of SPM and its AcoD with food waste (FW) were evaluated through the biochemical methane potential (BMP) test, and kinetic parameters were analyzed through the analysis of the kinetic models of first order and modified Gompertz. This study showed that the AcoD of SPM with FW improved the hydrolysis stage, increased methane (CH4) yield, improved the stability of the process, and presented synergistic effects. As regards the hydrolysis stage, the hydrolysis constant was increased, and the lag phase was reduced. The monodigestion of SPM (SPM : FW 100 : 0) showed an increase of 9% with the addition of external nutrients solution, while that of AcoD in the SPM : FW 80 : 20 ratio showed the highest CH4 yield, with increments of 12 and 22% in comparison with the monodigestion of SPM under WN and NN conditions, respectively. It is even possible to add up to 40% of FW (SPM : FW 60 : 40) and achieve an increase of 5% compared to the monodigestion of SPM under the NN condition. The synergistic effects obtained in this study showed that the incorporation of FW, in the substrates ratios evaluated, would improve the AD of the SPM without addition of external nutrients solution, which represents economic and environmental benefits of implementing this alternative at full scale.

scholarly journals Effect of Pasteurisation on Methane Yield from Food Waste and Other Substrates in Anaerobic Digestion

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1351
Author(s):  
Yue Zhang ◽  
Sigrid Kusch-Brandt ◽  
Sonia Heaven ◽  
Charles J. Banks
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Statistical Significance ◽  
Methane Yield ◽  
Volatile Components ◽  
Cattle Slurry ◽  
Animal Blood ◽  
Potato Waste ◽  
Methane Potential ◽  
The Difference

The effect of pasteurisation and co-pasteurisation on biochemical methane potential values in anaerobic digestion (AD) was studied. Pasteurisation prior to digestion in a biogas plant is a common hygienisation method for organic materials which contain or have been in contact with animal by-products. Tests were carried out on food waste, slaughterhouse waste, animal blood, cattle slurry, potato waste, card packaging and the organic fraction of municipal solid waste (OFMSW); pasteurisation at 70 °C for 1 h was applied. Pasteurisation had increased the methane yields of blood (+15%) and potato waste (+12%) only, which both had a low content of structural carbohydrates (hemi-cellulose and cellulose) but a particularly high content of either non-structural carbohydrates such as starch (potato waste) or proteins (blood). With food waste, card packaging and cattle slurry, pasteurisation had no observable impact on the methane yield. Slaughterhouse waste and OFMSW yielded less methane after pasteurisation in the experiments (but statistical significance of the difference between pasteurised and unpasteurised slaughterhouse waste or OFMSW was not confirmed in this work). It is concluded that pasteurisation can positively impact the methane yield of some specific substrates, such as potato waste, where heat-treatment may induce gelatinisation with release of the starch molecules. For most substrates, however, pasteurisation at 70 °C is unlikely to increase the methane yield. It is unlikely to improve biodegradability of lignified materials, and it may reduce the methane yield from substrates which contain high contents of volatile components. Furthermore, in this experimental study, the obtained methane yield was unaffected by whether the substrates were pasteurised individually and then co-digested or co-pasteurised as a mixture before batch digestion.

scholarly journals Impact of Attrition Ball-Mill on Characteristics and Biochemical Methane Potential of Food Waste

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2085
Author(s):  
Yang Mo Gu ◽  
Seon Young Park ◽  
Ji Yeon Park ◽  
Byoung-In Sang ◽  
Byoung Seong Jeon ◽  
...  
Keyword(s):  
Particle Size ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Methane Production ◽  
Ball Mill ◽  
Volatile Fatty Acids ◽  
Milling Time ◽  
Biochemical Methane Potential ◽  
Methane Potential ◽  
The Impact

The impact of attrition ball-mill pretreatment on food waste particle size, soluble chemical oxygen demand (SCOD), biochemical methane potential, and microbial community during anaerobic digestion was investigated based on milling speed and time. The uniformity of particle size improved with increasing milling speed and time. The SCOD of the pretreated samples increased to 4%, 7%, and 17% at the speeds of 150, 225, and 300 rpm, respectively, compared to the control. Milling time did not significantly change the SCOD. The cumulative methane productions of 430, 440, and 490 mL/g-VS were observed at the speeds of 150, 225, and 300 rpm, respectively, while the untreated sample exhibited the cumulative methane production of 390 mL/g-VS. Extended milling time did not improve methane production much. When the milling times of 10, 20, and 30 min were applied with the milling speed fixed at 300 rpm, the methane productions of 490, 510, and 500 mL/g-VS were observed respectively. Ball-mill pretreatment also increased the total volatile fatty acids. During the anaerobic digestion (AD) of ball-mill treated food waste, acetoclastic methanogens predominated, with a relative abundance of 48–49%. Interestingly, hydrogenotrophic methanogens were 1.6 times higher in the pretreated samples than those in the control. These results showed the potential of attrition ball milling as a food waste pretreatment for improving methane production.

scholarly journals The Influence of Low-Temperature Food Waste Biochars on Anaerobic Digestion of Food Waste

2021 ◽  
Author(s):  
Kacper Świechowski ◽  
Andrzej Białowiec ◽  
Bartosz Matyjewicz ◽  
Paweł Telega
Keyword(s):  
Anaerobic Digestion ◽  
Low Temperature ◽  
Food Waste ◽  
Hydrothermal Carbonization ◽  
Batch Reactors ◽  
Biochemical Methane Potential ◽  
Order Model ◽  
Methane Potential ◽  
Potential Test ◽  
Residual Heat

The proof-of-the-concept of application of low-temperature food waste biochars for the anaerobic digestion (AD) of food waste (the same substrate) was tested. The concept assumes that residual heat from biogas utilization may be reused for biochar production. Four low-temperature biochars produced under two pyrolytic temperatures 300 °C and 400 °C and under atmospheric and 15 bars pressure with 60 minutes retention time were used. Additionally, the biochar produced during hydrothermal carbonization (HTC) was tested. The work studied the effect of a low biochar dose (0.05 gBC x gTSsubstrate-1, or 0.65 gBC x L-1) on AD batch reactors’ performance. The biochemical methane potential test took 21 days and the process kinetics using the first-order model were determined. The results showed that biochars obtained under 400°C with atmospheric pressure and under HTC conditions improve methane yield by 3.6%. It has been revealed that thermochemical pressure influences the electrical conductivity of biochars. The biomethane was produced with a rate (k) of 0.24 d-1, and the most effective biochars increased the biodegradability of FW to 81% in comparison to variants without biochars (75%).

scholarly journals Smart Approaches to Food Waste Final Disposal

2019 ◽  
Vol 16 (16) ◽  
pp. 2860 ◽  
Author(s):  
Franco Cecchi ◽  
Cristina Cavinato
Keyword(s):  
Anaerobic Digestion ◽  
Greenhouse Gas ◽  
Food Waste ◽  
Waste Treatment ◽  
Biogas Production ◽  
Ghg Emissions ◽  
Renewable Resource ◽  
Wide Availability ◽  
Anaerobic Codigestion ◽  
Suitable Treatment

Food waste, among the organic wastes, is one of the most promising substrates to be used as a renewable resource. Wide availability of food waste and the high greenhouse gas impacts derived from its inappropriate disposal, boost research through food waste valorization. Several innovative technologies are applied nowadays, mainly focused on bioenergy and bioresource recovery, within a circular economy approach. Nevertheless, food waste treatment should be evaluated in terms of sustainability and considering the availability of an optimized separate collection and a suitable treatment facility. Anaerobic codigestion of waste-activated sludge with food waste is a way to fully utilize available anaerobic digestion plants, increasing biogas production, energy, and nutrient recovery and reducing greenhouse gas (GHG) emissions. Codigestion implementation in Europe is explored and discussed in this paper, taking into account different food waste collection approaches in relation to anaerobic digestion treatment and confirming the sustainability of the anaerobic process based on case studies. Household food waste disposal implementation is also analyzed, and the results show that such a waste management system is able to reduce GHG emissions due to transport reduction and increase wastewater treatment performance.

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