Comparison of methane production by co-digesting fruit and vegetable waste with first stage and second stage anaerobic digester sludge from a two stage digester

2012 ◽  
Vol 65 (7) ◽  
pp. 1252-1257 ◽  
Author(s):  
Nathan D. Park ◽  
Ronald W. Thring ◽  
Steve S. Helle
Keyword(s):  
Methane Production ◽  
Anaerobic Digester ◽  
Batch Reactors ◽  
Vegetable Waste ◽  
Fruit And Vegetable ◽  
Methane Generation ◽  
Second Stage ◽  
Substrate Ratio ◽  
Sewer Sludge ◽  
Anaerobic Digester Sludge

Fruit and vegetable waste (FVW) was co-digested with first stage (FSS) and second stage anaerobic digester sludge (SSS) separately, over the course of 10 days, in batch reactors. Addition of FVW significantly increased the methane production in both sludges. After 10 days of digestion FSS + FVW produced 514 ± 57 L CH4 kg VS−1added compared with 392 ± 16 L CH4 for the SSS + FVW. The increased methane yield was most likely due to the higher inoculum substrate ratio of the FSS. The final VS and COD contents of the sewer sludge and FVW mixtures were not significantly different from the control values suggesting that all of the FVW added was degraded within 10 days. It is recommended that FVW be added to the first stage of the anaerobic digester in order to maximize methane generation.

Co-treatment of fruit and vegetable waste in sludge digesters. An analysis of the relationship among bio-methane generation, process stability and digestate phytotoxicity

2014 ◽  
Vol 34 (9) ◽  
pp. 1603-1608 ◽  
Author(s):  
Francesco Di Maria ◽  
Alessio Sordi ◽  
Giuseppe Cirulli ◽  
Giovanni Gigliotti ◽  
Luisa Massaccesi ◽  
...  
Keyword(s):  
Generation Process ◽  
Vegetable Waste ◽  
Process Stability ◽  
Fruit And Vegetable ◽  
Methane Generation ◽  
The Relationship

Increased biogas production in a wastewater treatment plant by anaerobic co-digestion of fruit and vegetable waste and sewer sludge – A full scale study

2011 ◽  
Vol 64 (9) ◽  
pp. 1851-1856 ◽  
Author(s):  
Nathan D. Park ◽  
Ronald W. Thring ◽  
Randy P. Garton ◽  
Michael P. Rutherford ◽  
Steve S. Helle
Keyword(s):  
Energy Recovery ◽  
Solid Waste Management ◽  
Biogas Production ◽  
Treatment Plant ◽  
Full Scale ◽  
Vegetable Waste ◽  
Fruit And Vegetable ◽  
Biogas Yield ◽  
Sewer Sludge ◽  
The City

Anaerobic digestion is a well established technology for the reduction of organic matter and stabilization of wastewater. Biogas, a mixture of methane and carbon dioxide, is produced as a useful by-product of the process. Current solid waste management at the city of Prince George is focused on disposal of waste and not on energy recovery. Co-digestion of fresh fruit and vegetable waste with sewer sludge can improve biogas yield by increasing the load of biodegradable material. A six week full-scale project co-digesting almost 15,000 kg of supermarket waste was completed. Average daily biogas production was found to be significantly higher than in previous years. Digester operation remained stable over the course of the study as indicated by the consistently low volatile acids-to-alkalinity ratio. Undigested organic material was visible in centrifuged sludge suggesting that the waste should have been added to the primary digester to prevent short circuiting and to increase the hydraulic retention time of the freshly added waste.

Anaerobic digestion of food waste with aerobic post-treatment: Effect of fruit and vegetable content

2018 ◽  
Vol 36 (10) ◽  
pp. 965-974 ◽  
Author(s):  
Sophia Ghanimeh ◽  
Charbel Abou Khalil ◽  
Elsy Ibrahim
Keyword(s):  
Food Waste ◽  
Oxygen Demand ◽  
Anaerobic Digester ◽  
Post Treatment ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Fruit And Vegetable ◽  
Removal Rates ◽  
Methane Generation ◽  
Highly Correlated

A mesophilic anaerobic digester, followed by a psychrophilic aerobic post-treatment, was used to treat food waste (FW) with different proportions of fruit and vegetable waste (FVW). Two types of FW were used: low fruit and vegetable mix (LFV, with 56.5% of FVW) and high fruit and vegetable mix (HFV, with 78.3% of FVW). The anaerobic digester fed with LFV failed at an organic loading rate of 1.6 g VS.L-1.d-1 (volatile fatty acid (VFA) = 6000 mg.L-1) due to high ammonia (reaching 3000 mg.L-1). It was shown that, in an unstable anaerobic environment, ammonia is highly correlated ( r2 = 0.77) with VFA and is negatively correlated with volatile solids, total solids, and chemical oxygen demand (COD) removal rates ( r2 = 0.88, r2 = 0.71, and r2 = 0.91, respectively). In contrast, the anaerobic digester fed with HFV exhibited a stable performance (VFA = 1243 mg.L-1), with limited ammonia accumulation (940 mg.L-1). Methane generation was affected by the FVW content and reached 531 ml CH4.g VS-1 (CH4 = 52%) with LFV feed and 478 ml CH4.g VS-1 (CH4 = 57.4%) with HFV. The overall TS, VS and COD removal rates (all ranging between 94% and 97%), were closely similar for LFV and HFV. Accordingly, the aerobic post-treatment seems to compensate for the reduced performance of the disturbed anaerobic system fed with LFV.

Amending anaerobic bioreactors with pyrogenic carbonaceous materials: the influence of material properties on methane generation

2018 ◽  
Vol 4 (11) ◽  
pp. 1794-1806 ◽  
Author(s):  
Qiwen Cheng ◽  
Francis L. de los Reyes ◽  
Douglas F. Call
Keyword(s):  
Electrical Conductivity ◽  
Material Properties ◽  
Methane Production ◽  
Carbonaceous Material ◽  
Batch Reactors ◽  
Short Term ◽  
Methane Generation ◽  
Anaerobic Bioreactors ◽  
Multiple Material ◽  
The Impact

The impact of pyrogenic carbonaceous material amendments on methane production in short-term anaerobic batch reactors depended on multiple material properties, including, but not limited to, electrical conductivity.

Effects of leachate recycle and anaerobic digester sludge recycle on the methane production from solid wastes

1998 ◽  
Vol 38 (2) ◽  
pp. 159-168 ◽  
Author(s):  
J. H. Bae ◽  
K. W. Cho ◽  
S. J. Lee ◽  
B. S. Bum ◽  
B. H. Yoon
Keyword(s):  
Methane Production ◽  
Anaerobic Digester ◽  
Solid Wastes ◽  
Anaerobic Digester Sludge

Performances of lab-scale lysimeters were evaluated to develop a new landfill system for the recovery of CH4 from solid wastes. Lysimeters were operated at three different conditions: control (L-control), leachate recycle (L-recycle), and sludge recycle (L-sludge). For L-sludge, sludge from the leachate-treating anaerobic digester was recycled, whereas the produced leachate was recycled for L-recycle. After 430 days of operation, the amounts of COD recovered by CH4 were 0.13, 0.29, and 22.5 kg for L-control, L-recycle, and L-sludge, respectively. For L-sludge, 77% of total COD outflow was recovered by CH4, and the remaining COD was washed out by leachate. However, less than 5% of total COD outflow was recovered as CH4 from L-control and L-recycle. Stabilization of organics in L-sludge approached completion within 430 days, while other lysimeters still produced leachate with high COD. Results indicated that the continuous addition of active methanogenic population from the anaerobic digester rather than simple leachate recycle was effective for the rapid and significant CH4 recovery from solid wastes.

Anaerobic co-digestion of winery wastewater

2007 ◽  
Vol 56 (2) ◽  
pp. 49-54 ◽  
Author(s):  
L. Rodríguez ◽  
J. Villaseñor ◽  
F.J. Fernández ◽  
I.M. Buendía
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Reduction Rate ◽  
Operational Performance ◽  
Waste Activated Sludge ◽  
Batch Reactors ◽  
Methane Generation ◽  
Winery Wastewater ◽  
Methane Production Rate ◽  
Mesophilic Conditions

The operational performance of anaerobic batch reactors treating winery wastewater (WW) combined with waste activated sludge (WAS) in different proportions was investigated under mesophilic conditions. In these experiments it was shown that for anaerobic digestion of WW alone, methane production rate was lower than the rates achieved when WW and WAS were treated together. When WW was mixed with WAS at a concentration of 50% WW resulted in the highest methane production rates. A simplified anaerobic model was used to determine the main kinetic parameters; maximum COD reduction rate (qDA) and maximum methane generation rate (kmax). The maximum values of qDA and kmax were 16.50 kgCOD COD−1 d−1 and 14.34 kgCOD kgCOD−1 d−1, respectively.

scholarly journals Biomethane Potential Test To Access The Feasibility of Vegetable And Fruit Waste For Methane Yield Using Different Inoculums To Substrate Ratios

2021 ◽  
Author(s):  
Akanksha Agrawal ◽  
Parmesh Kumar Chaudhari ◽  
Prabir Ghosh
Keyword(s):  
Fossil Fuels ◽  
Global Climate ◽  
Methane Yield ◽  
Vegetable Waste ◽  
Fruit And Vegetable ◽  
Glass Bottle ◽  
Biogas Yield ◽  
Biomethane Potential ◽  
Substrate Ratio ◽  
Potential Test

Abstract To address the world's energy issue and global climate change, a green, efficient and carbon-neutral renewable energy sourcesare in great demand to replace fossil fuels. The study was undertaken to determine optimal inoculum to substrate ratio for increase in biogas generation via co-digestion of fruit and vegetable waste under mesophilic environmental conditions (25–34oC). Biomethane potential of the fruit and vegetable waste was accessed in terms of biogas yield. Digestate from gobar gas plant was taken as inoculum. Biomethane potential (BMP) assay was performed in a 500ml glass bottle with suitable inlet and outlet arrangement for taking feed and collection of biogas. Inoculum to substrateratio chosen for the study was 0.2, 0.3,0.5,0.7 and 0.8. Highest daily biogas yield was obtained for inoculum to substrate ratio of 30: 70 i.e. reactor R2 which is equivalent to 440 ml on day 14 with methane yield of 58%. Cumulative biogas yields for different inoculum to substrate ratio were in the range of 6–11.378 L/day.

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