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.

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.

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.

scholarly journals Anaerobic Co-Digestion of Water Hyacinth (E. crassipes) with Ruminal Slaughterhouse Waste for Biogas Production

2019 ◽  
Vol 8 (3) ◽  
pp. 253-259 ◽  
Author(s):  
Erick Auma Omondi ◽  
Peter Gikuma Njuru ◽  
Peter Kuria Ndiba
Keyword(s):  
Retention Time ◽  
Water Hyacinth ◽  
Fossil Fuels ◽  
Environmental Concern ◽  
Biogas Production ◽  
Methane Yield ◽  
Biogas Yield ◽  
Process Dynamics ◽  
Invasive Aquatic Plant ◽  
Initial Drop

The use of biomass as renewable energy source is of interest in reducing dependence on fossil fuels and associated impacts of climate change. Water hyacinth (WH), an invasive aquatic plant of environmental concern has large biomass that is available for biogas production. Co-digestion of this largely lignocellulose biomass with other substrates may correlate process parameters and improve biogas production. This study evaluated co-digestion of WH biomass with various mix proportions of ruminal slaughterhouse waste (RSW) at 24, 32 and 37°C in order to assess the optimum proportion and temperature. The rate of biomethanation increased with temperature from 0.23 at 24ºC to 0.75 and 0.96 at 32ºC and 37ºC, respectively, and similarly methane yield improved from 14 at 24ºC to 40 and 52 L/kg air dried water hyacinth at 32ºC and 37ºC respectively. A WH: RSW ratio of 30% showed optimum acclimatization and methane yield in a residence time of 60 days. The duration of the initial drop in pH that indicates hydrolysis stage decreased with increase in proportion of RSW, indicating faster hydrolysis and fermentation processes. Longer and stable latter alkaline pH zone suggested improved biomethanation and greater biogas production. Co-digestion with 30% RSW at 24ºC improved biogas yield by 75% from 8.05 to 14.09L/Kg biomass, methane component of biogas by 9% from 59 to 68% and reduced the retention time for substrate by 36%, suggesting synergy in co-digestion with respect to biogas quality. Changing the temperature from 24 to 32ºC increased the yield by 186% and reduced retention time by 73%. The results demonstrated synergy in co-digestion of the two substrates and the process dynamics that are useful in a possible process commercialization. ©2019. CBIORE-IJRED. All rights reserved

Recovering biomethane and nutrients from anaerobic digestion of water hyacinth (Eichhornia crassipes) and its co-digestion with fruit and vegetable waste

2015 ◽  
Vol 73 (2) ◽  
pp. 355-361 ◽  
Author(s):  
M. A. Hernández-Shek ◽  
L. S. Cadavid-Rodríguez ◽  
I. V. Bolaños ◽  
A. C. Agudelo-Henao
Keyword(s):  
Anaerobic Digestion ◽  
Water Hyacinth ◽  
Biogas Production ◽  
Organic Loading Rate ◽  
Vegetable Waste ◽  
Fruit And Vegetable ◽  
Biogas Yield ◽  
Stirred Tank Reactors ◽  
Volatile Solids ◽  
Bmp Test

The potential to recover bioenergy from anaerobic digestion of water hyacinth (WH) and from its co-digestion with fruit and vegetable waste (FVW) was investigated. Initially, biogas and methane production were studied using the biochemical methane potential (BMP) test at 2 g volatile solids (VS) L−1 of substrate concentration, both in the digestion of WH alone and in its co-digestion with FVW (WH-FVW ratio of 70:30). Subsequently, the biogas production was optimized in terms of total solids (TS) concentration, testing 4 and 6% of TS. The BMP test showed a biogas yield of 0.114 m3 biogas kg−1 VSadded for WH alone. On the other hand, the biogas potential from the WH-FVW co-digestion was 0.141 m3 biogas kg−1 VSadded, showing an increase of 23% compared to that of WH alone. Maximum biogas production of 0.230 m3 biogas kg−1 VSadded was obtained at 4% of TS in the co-digestion of WH-FVW. Using semi-continuously stirred tank reactors, 1.3 m3 biogas yield kg−1 VSadded was produced using an organic loading rate of 2 kg VS m−3 d−1 and hydraulic retention time of 15 days. It was also found that a WH-FVW ratio of 80:20 improved the process in terms of pH stability. Additionally, it was found that nitrogen can be recovered in the liquid effluent with a potential for use as a liquid fertilizer.

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