A state of the art literature review on anaerobic digestion of food waste: influential operating parameters on methane yield

The aim of this study was to treat food waste containing 25% total solids (TS) through dry anaerobic digestion (dry AD) process at various pressures (0.5 to 2.5 kg/cm2) and different time duration (20 to 100 min) to understand the impact of pretreatment in enhancing the methane generation potential along with insights on scale up. The findings revealed that vs. reduction and methane yield of 60% and 0.25 L CH4/(g VSadded) can be achieved with pretreated food waste at two kilograms per square centimeter, while pretreatment of food waste at 2 kg/cm2 for 100 min enhanced the vs. reduction from 60% to 85% and methane yield from 0.25 to 0.368 L CH4/(g VSadded). However, the net energy indicated that 40 min of pre -treatment at two kilograms per square centimeter can be a suitable option as methane yield and vs. reduction of 0.272 L CH4/(g VSadded) and 70%, respectively was achieved. The vs. reduction and the methane yield of 45% and 0.14 L CH4/(g VSadded), respectively was obtained from untreated food waste which illustrated that pretreatment had significantly impacted on the enhancement of methane generation and organic matter removal which can make the dry AD process more attractive and feasible at commercial scale.

Download Full-text

Solid state anaerobic digestion of food waste and sewage sludge: Impact of mixing ratios and temperature on microbial diversity, reactor stability and methane yield

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.148586 ◽

2021 ◽

pp. 148586

Author(s):

Vijayalakshmi Arelli ◽

Naveen Kumar Mamindlapelli ◽

Sameena Begum ◽

Sudharshan Juntupally ◽

Gangagni Rao Anupoju

Keyword(s):

Anaerobic Digestion ◽

Solid State ◽

Sewage Sludge ◽

Microbial Diversity ◽

Food Waste ◽

Methane Yield ◽

Mixing Ratios ◽

Reactor Stability

Download Full-text

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

Processes ◽

10.3390/pr8111351 ◽

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.

Download Full-text

Study on Solid-State Anaerobic Co-Digestion with Distiller’s Grains and Food Waste for Methane Production

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.485.306 ◽

2012 ◽

Vol 485 ◽

pp. 306-309

Author(s):

Li Hong Wang ◽

Qun Hui Wang ◽

Wei Wei Cai

Keyword(s):

Anaerobic Digestion ◽

Solid State ◽

Synergistic Effect ◽

Food Waste ◽

Methane Production ◽

Waste Treatment ◽

Biogas Production ◽

Methane Yield ◽

Kitchen Waste ◽

Distiller's Grains

Solid-state anaerobic digestion (SSAD) of distiller’s grains (DG) and kitchen waste (KW) for biogas was investigated. Six DG to KW ratios of 10/1, 8/1, 6/1, 4/1, 1/0, and 0/1 was used. The results showed that in 48 digestion days the co-digestion with DG to KW ratio of 8:1 obtained the highest methane yield of 159.74mL/gTS, TS and VS reductions of 58.7% and 71.8%, hemicellulase, cellulose and lignin reductions of 46.7%, 45.4% and 4.0%. Compared to mono-digestions of DG or KW, co-digestion of DG and FW had a good synergistic effect. It indicated that SSAD of cellulosic-based waste and food waste could be one of the options for efficient biogas production and waste treatment

Download Full-text

Hydrogen Production by Anaerobic Digestion of Biomass with High Lignocellulose Content - References Selection Procedure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.659.475 ◽

2014 ◽

Vol 659 ◽

pp. 475-480

Author(s):

Bernadette Emöke Teleky ◽

Mugur Ciprian Balan

Keyword(s):

Anaerobic Digestion ◽

Hydrogen Production ◽

Literature Review ◽

Preliminary Analysis ◽

State Of The Art ◽

Selection Procedure ◽

Scientific Databases ◽

Manual Selection ◽

Preliminary Study ◽

Selection Of

The manuscript presents an objective and rigorous references selection procedure for a literature review concerning the state of the art in the field of bio-hydrogen production by anaerobic digestion of biomass with high lignocellulose content. The references selection procedure is presented in detail, with stages and different including and excluding criteria. The scientific databases and the key words used for their interrogation are also presented. The methodology of references selection consists of the following steps: automatic scientific databases interrogation, manual selection of references from the automatic interrogations results based on titles and abstracts, addition of new references based on study of references list from the previously selected papers, addition of references representing Romanian contributions and selection of papers based on preliminary study of their content. The main obtained results based on preliminary analysis of the selected references consist in presentation of the first published references, of the newest references and of the most cited references. It was highlighted that the trend of publication in anaerobic digestion of biomass with high lignocellulose content with the scope of hydrogen production, is in continuous increasing interest worldwide.

Download Full-text

The effect of the labile organic fraction in food waste and the substrate/inoculum ratio on anaerobic digestion for a reliable methane yield

Bioresource Technology ◽

10.1016/j.biortech.2014.01.018 ◽

2014 ◽

Vol 157 ◽

pp. 174-180 ◽

Cited By ~ 78

Author(s):

Minako Kawai ◽

Norio Nagao ◽

Nobuaki Tajima ◽

Chiaki Niwa ◽

Tatsushi Matsuyama ◽

...

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Methane Yield ◽

Organic Fraction

Download Full-text

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Processes ◽

10.3390/pr7090600 ◽

2019 ◽

Vol 7 (9) ◽

pp. 600 ◽

Cited By ~ 13

Author(s):

Sagor Kumar Pramanik ◽

Fatihah Binti Suja ◽

Mojtaba Porhemmat ◽

Biplob Kumar Pramanik

Keyword(s):

Experimental Data ◽

Anaerobic Digestion ◽

Kinetic Model ◽

Removal Efficiency ◽

Food Waste ◽

Biogas Production ◽

Gompertz Model ◽

Methane Yield ◽

Biogas Yield ◽

Modified Gompertz Model

A large quantity of food waste (FW) is generated annually across the world and results in environmental pollution and degradation. This study investigated the performance of a 160 L anaerobic biofilm single-stage reactor in treating FW. The reactor was operated at different hydraulic retention times (HRTs) of 124, 62, and 35 days under mesophilic conditions. The maximum biogas and methane yield achieved was 0.934 L/g VSadded and 0.607 L CH4/g VSadded, respectively, at an HRT of 124 days. When HRT decreased to 62 days, the volatile fatty acid (VFA) and ammonia accumulation increased rapidly whereas pH, methane yield, and biogas yield decreased continuously. The decline in biogas production was likely due to shock loading, which resulted in scum accumulation in the reactor. A negative correlation between biogas yield and volatile solid (VS) removal efficiency was also observed, owing to the floating scum carrying and urging the sludge toward the upper portion of the reactor. The highest VS (79%) and chemical oxygen demand (COD) removal efficiency (80%) were achieved at an HRT of 35 days. Three kinetic models—the first-order kinetic model, the modified Gompertz model, and the logistic function model—were used to fit the cumulative biogas production experimental data. The kinetic study showed that the modified Gompertz model had the best fit with the experimental data out of the three models. This study demonstrates that the stability and performance of the anaerobic digestion (AD) process, namely biogas production rate, methane yield, intermediate metabolism, and removal efficiency, were significantly affected by HRTs.

Download Full-text

The positive effects of waste leachate addition on methane fermentation from food waste in batch trials

Water Science & Technology ◽

10.2166/wst.2015.231 ◽

2015 ◽

Vol 72 (3) ◽

pp. 429-436 ◽

Cited By ~ 7

Author(s):

Wanli Zhang ◽

Lei Zhang ◽

Aimin Li

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Volatile Fatty Acids ◽

Methane Content ◽

Methane Yield ◽

Methane Fermentation ◽

Mixture Ratio ◽

Positive Effects ◽

Stable Performance ◽

Waste Leachate

The purposes of this study were to investigate the effect of waste leachate (WL) addition on batch anaerobic digestion of food waste (FW), and to examine the influence of mixture ratio on the co-digestion process. The results showed that anaerobic digestion of FW was greatly enhanced by WL addition, as indicated by the higher methane yield, higher methane content, more volatile solids (VS) destruction, and higher stability. Although WL was rich in volatile fatty acids (VFA), its addition did not cause VFA inhibition. It was found that WL addition was beneficial to accelerate the start-up and shorten the long reaction time of the batch anaerobic process. The time to reach the peak methane yield was reduced by 1, 2, and 4 days with WL addition. The optimum FW to WL ratio was 77.9:22.1 with the highest methane yield (416 mL/g VS), the highest methane content (64.3%), the greatest VS removal (77.6%), and stable performance. These results confirmed the positive effects of WL addition on methane fermentation from FW.

Download Full-text

Enhanced Anaerobic Digestion of Sewage Sludge by Addition of Food Waste

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.777.139 ◽

2013 ◽

Vol 777 ◽

pp. 139-142

Author(s):

Li Han ◽

Ru Ying Li ◽

Min Ji

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Removal Efficiency ◽

Food Waste ◽

Methane Yield ◽

Anaerobic Sludge ◽

Sludge Digestion ◽

Vs Removal ◽

Anaerobic Sludge Digestion ◽

Mesophilic Condition

In order to improve the methane yield and removal efficiency of organic matters in anaerobic sludge digestion, effects of addition of food waste were investigated at mesophilic condition. Results showed that the optimal TS ratio between sewage sludge and food waste was 4:1, with a methane yield of 592.7 ml/g-VS, methane content of 66.84% and the VS removal efficiency of 31%, which were 47%, 50% and 55% higher than those of sole sludge digestion, respectively.

Download Full-text

Treatment of Cattle Manure by Anaerobic Co-Digestion with Food Waste and Pig Manure: Methane Yield and Synergistic Effect

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17134737 ◽

2020 ◽

Vol 17 (13) ◽

pp. 4737 ◽

Cited By ~ 2

Author(s):

Gahyun Baek ◽

Danbee Kim ◽

Jinsu Kim ◽

Hanwoong Kim ◽

Changsoo Lee

Keyword(s):

Anaerobic Digestion ◽

Synergistic Effect ◽

Food Waste ◽

Antagonistic Effect ◽

Cattle Manure ◽

Methane Yield ◽

Pig Manure ◽

Mixing Ratio ◽

Synergy Index ◽

Index Model

The management of cattle manure (CM) has become increasingly challenging because its production continues to rise, while the regulations on manure management have become increasingly stringent. In Korea, most farms produce CM as a dry mixture with lignocellulosic bedding materials (mainly sawdust), making it impractical to treat CM by anaerobic digestion. To address this problem, this study examined whether anaerobic co-digestion with food waste (FW) and pig manure (PM) could be an effective approach for the treatment of CM. The batch anaerobic digestion tests at different CM: FW: PM mixing ratios showed that more methane was produced as the FW fraction increased, and as the CM fraction decreased. The response surface models describing how the substrate mixing ratio affects the methane yield and synergistic effect (methane yield basis) were successfully generated. The models proved that the methane yield and synergistic effect respond differently to changes in the substrate mixing ratio. The maximum 30-day methane yield was predicted at 100% FW, whereas the maximum 30-day synergy index was estimated for the mixture of 47% CM, 6% FW, and 47% PM (total solids basis). The synergy index model showed that CM, FW, and PM could be co-digested without a substantial loss of their methane potential at any mixing ratio (30-day synergy index, 0.89–1.22), and that a possible antagonistic effect could be avoided by keeping the FW proportion less than 50%. The results suggest that co-digestion with PM and FW could be flexibly applied for the treatment and valorization of CM in existing anaerobic digestion plants treating FW and PM.

Download Full-text