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

2015 ◽  
Vol 72 (3) ◽  
pp. 429-436 ◽  
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.

A comparative study of anaerobic digestion of food waste in a single pass, a leachate recycle and coupled solid/liquid reactors

2003 ◽  
Vol 47 (1) ◽  
pp. 319-324 ◽  
Author(s):  
H.L. Xu ◽  
J.Y. Wang ◽  
H. Zhang ◽  
J.H. Tay
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Methane Content ◽  
Anaerobic Sludge ◽  
Methane Fermentation ◽  
Two Phase ◽  
Single Pass ◽  
Digestion Process ◽  
Solid Liquid ◽  
Methanogenic Phase

A single pass reactor (R1), a leachate recycle reactor (R2) and a coupled solid/liquid bioreactor (R3-Rm) for anaerobic digestion of food waste were comparatively investigated in terms of digestion process and treatment efficiency. The coupled solid/liquid bioreactor is an enhanced two-phase system and distinctive from a traditional two-phase process with an upflow anaerobic sludge blanket (UASB) reactor as the methanogenic phase and a circulation of treated leachate between the acidification and methanogenic phases. In comparison with R1 and R2, R3-Rm enhanced the digestion process and increased the methane content of biogas. 100% of the R3-Rm methane yield was from the methanogenic phase with average methane content of 71%. The significant enhancement was also confirmed by the removal of 79% of total organic carbon (TOC), 60% of volatile solids (VS) and 80% of total COD in 12 days running of R3-Rm. However, no active methane fermentation was detected in R1 and R2 during 60 days operation. The results in this laboratory-scale study show that the rapid accumulation of volatile fatty acids (VFAs) due to the rapid acidification of food waste inhibits the development of effective methane fermentation in single pass and leachate recycle reactors. The coupled solid/liquid bioreactor is more efficient in converting food waste into methane and carbon dioxide.

Increasing 2 -Bio- (H2 and CH4) production from food waste by combining two-stage anaerobic digestion and electrodialysis for continuous volatile fatty acids removal

2021 ◽  
Vol 129 ◽  
pp. 20-25
Author(s):  
Gamal K. Hassan ◽  
Rhys Jon Jones ◽  
Jaime Massanet-Nicolau ◽  
Richard Dinsdale ◽  
M.M. Abo-Aly ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Two Stage ◽  
Ch4 Production

scholarly journals Improved Food Waste Stabilization and Valorization by Anaerobic Digestion Through Supplementation of Conductive Materials and Trace Elements

2020 ◽  
Vol 12 (12) ◽  
pp. 5222 ◽  
Author(s):  
A. Sinan Akturk ◽  
Goksel N. Demirer
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Value Added ◽  
Electron Transfer Mechanism ◽  
Conductive Material ◽  
Positive Effects ◽  
Waste Stabilization ◽  
Environmentally Safe

The positive effects of conductive material supplementation on anaerobic digestion have been mainly investigated for single synthetic substrates, while its significance for real and complex organic wastes such as food waste has not been sufficiently investigated. This study investigated the effect of conductive material (biochar and magnetite) and trace metal supplementation on the anaerobic digestion of food waste by means of biochemical methane potential assays. The results indicated that the supplementation of biochar and trace metals improved both total biogas production and methane yields. A biochar dose of 2.0 and 5.0 g/L resulted in 11.2 ± 6.5 and 27.3 ± 9.5% increase in biogas and 8.3 ± 6.8 and 33.2 ± 2.8% increase in methane yield, respectively. Moreover, the same reactors demonstrated high food waste stabilization performance of over 80% chemical oxygen demand removal efficiency. These results indicate that biochar supplementation leads to more enhanced anaerobic digestion operation that could be through increased surface area for microbial growth and/or direct interspecies electron transfer mechanism. In turn, food waste will not only be stabilized but also valorized by anaerobic digestion at higher efficiencies that support sustainable waste management through both environmentally safe disposal and value-added generation.

Anaerobic digestion of food waste to volatile fatty acids and hydrogen at high organic loading rates in immersed membrane bioreactors

2020 ◽  
Vol 152 ◽  
pp. 1140-1148 ◽  
Author(s):  
Steven Wainaina ◽  
Mukesh Kumar Awasthi ◽  
Ilona Sárvári Horváth ◽  
Mohammad J. Taherzadeh
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Membrane Bioreactors ◽  
Organic Loading ◽  
Loading Rates

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

2017 ◽  
Vol 16 (2) ◽  
pp. 347-360 ◽  
Author(s):  
Dimitrios Komilis ◽  
Raquel Barrena ◽  
Rafaela Lora Grando ◽  
Vasilia Vogiatzi ◽  
Antoni Sánchez ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Literature Review ◽  
Food Waste ◽  
State Of The Art ◽  
Methane Yield ◽  
Operating Parameters

scholarly journals Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1018
Author(s):  
Vijayalakshmi Arelli ◽  
Sudharshan Juntupally ◽  
Sameena Begum ◽  
Gangagni Rao Anupoju
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Scale Up ◽  
Methane Yield ◽  
Net Energy ◽  
Time Duration ◽  
Methane Generation ◽  
Pre Treatment ◽  
The Impact ◽  
Dry Anaerobic Digestion

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.

scholarly journals Influence of Performance and Microbial Community by Internal pH Control on Anaerobic Digestion of Food Waste Leachate

2013 ◽  
Vol 35 (8) ◽  
pp. 571-578 ◽  
Author(s):  
Yeo-Myeong Yun ◽  
Si-Kyung Cho ◽  
Da-Young Jeong ◽  
Eun-Jin Lee ◽  
Kwan-Yong Huh ◽  
...  
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Ph Control ◽  
Internal Ph ◽  
Food Waste Leachate ◽  
Waste Leachate

Rapid-rate thermophilic, single-stage and two-phase methane fermentation of synfuel-industry wastewaters

2001 ◽  
Vol 43 (1) ◽  
pp. 35-42
Author(s):  
S. Ghosh ◽  
D. Jerger ◽  
M. P. Henry ◽  
A. Sajjad
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Hydrolytic Degradation ◽  
Single Stage ◽  
Methane Yield ◽  
Residence Times ◽  
Rapid Rate ◽  
Methane Fermentation ◽  
Two Phase ◽  
End Products

Thermophilic (55°C) anaerobic digestion of wastewaters from wet carbonization of Minnesota peat was conducted in a simple, upflow digester at an HRT of one day to provide a methane yield of 0.20 SCM/kg VS added and a BOD5 reduction of 85%. Carbonization of Maine peat conducted for a much longer duration of thermal treatment produced recalcitrant and potentially toxic end products that reduced the biodegradability of wastewaters. Methane fermentation of the Maine-peat wet-carbonization waste was inhibited at an HRT of one day in the single-stage digester. However, two-phase digestion with separate acid-phase fermentation to promote hydrolytic degradation of toxic end products followed by separate methane fermentation at an HRT of 2 days exhibited a methane yield of 0.21 SCM/kg VS added and a BOD5 reduction of 76%. Volatile fatty acids profiles along the depths digesting cultures indicated that single-stage and two-phase digestion could be accomplished at one-half the reactor residence times (one day for single-stage and three days for two-phase) used in this research.

Sign in / Sign up

Export Citation Format

Share Document