Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste

The project was conducted to study leaching bed reactors for the hydrolysis of carbohydrate rich solid organic waste. It also explored the current leaching bed reactor designs and identified the best type of hydrolysis for the three-phase anaerobic digestion system (3PADS) for the co-production of h...

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Bibliographic Details
Main Author: Er, Aldred Guo Yao
Other Authors: Wang Jing-Yuan
Format: Final Year Project (FYP)
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/15869
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author Er, Aldred Guo Yao
author2 Wang Jing-Yuan
author_facet Wang Jing-Yuan
Er, Aldred Guo Yao
author_sort Er, Aldred Guo Yao
collection NTU
description The project was conducted to study leaching bed reactors for the hydrolysis of carbohydrate rich solid organic waste. It also explored the current leaching bed reactor designs and identified the best type of hydrolysis for the three-phase anaerobic digestion system (3PADS) for the co-production of hydrogen and methane. 2 types of hydrolysis such as hydrogenogenic hydrolysis and solubilisation hydrolysis were discussed and modelling calculations was conducted to assess the fed-batch leaching bed reactor performance of removing total volatile solids and starch. The appropriate type of seed sludge used and suitable operational design of the leaching bed for 3PADS was discussed. Hydrogenogenic hydrolysis produced leachates with high amount of soluble sugar and allowed for high rate of hydrogen gas production. Solubilisation hydrolysis allowed for high volatile solids degradation of solid organic waste. Batch experiments were conducted to understand such hydrolysis and it was found that pH adjustment and new substrate addition was needed after 4 days of experiment to allow for optimum hydrogenogenic hydrolysis. Metabolic shifts between acidogenesis and solventogenesis were influenced by changes in pH and it was identified that undissociated butyric acid initiated solventogenesis. Further batch experiments were conducted to determine the most appropriate seed sludge needed for hydrolysis and it was found that heated digested sludge was ideal for hydrolysis. A ratio of sludge-to-feedstock of 3 was also determined in the experiment for assessing the amount of seed sludge needed. Lastly, a fed batch experiment seeded with heated digested sludge was conducted where both optimum hydrogenogenic and solubilisation hydrolysis were achieved. Modelling calculations were also carried out where model calculations showed that 82.6% of total volatile solids were removed with 93% of the total starch degraded with the fed batch experiment.
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spelling ntu-10356/158692023-03-03T16:54:34Z Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste Er, Aldred Guo Yao Wang Jing-Yuan School of Civil and Environmental Engineering Environmental Engineering Research Centre DRNTU::Engineering::Environmental engineering::Waste management The project was conducted to study leaching bed reactors for the hydrolysis of carbohydrate rich solid organic waste. It also explored the current leaching bed reactor designs and identified the best type of hydrolysis for the three-phase anaerobic digestion system (3PADS) for the co-production of hydrogen and methane. 2 types of hydrolysis such as hydrogenogenic hydrolysis and solubilisation hydrolysis were discussed and modelling calculations was conducted to assess the fed-batch leaching bed reactor performance of removing total volatile solids and starch. The appropriate type of seed sludge used and suitable operational design of the leaching bed for 3PADS was discussed. Hydrogenogenic hydrolysis produced leachates with high amount of soluble sugar and allowed for high rate of hydrogen gas production. Solubilisation hydrolysis allowed for high volatile solids degradation of solid organic waste. Batch experiments were conducted to understand such hydrolysis and it was found that pH adjustment and new substrate addition was needed after 4 days of experiment to allow for optimum hydrogenogenic hydrolysis. Metabolic shifts between acidogenesis and solventogenesis were influenced by changes in pH and it was identified that undissociated butyric acid initiated solventogenesis. Further batch experiments were conducted to determine the most appropriate seed sludge needed for hydrolysis and it was found that heated digested sludge was ideal for hydrolysis. A ratio of sludge-to-feedstock of 3 was also determined in the experiment for assessing the amount of seed sludge needed. Lastly, a fed batch experiment seeded with heated digested sludge was conducted where both optimum hydrogenogenic and solubilisation hydrolysis were achieved. Modelling calculations were also carried out where model calculations showed that 82.6% of total volatile solids were removed with 93% of the total starch degraded with the fed batch experiment. Bachelor of Engineering (Environmental Engineering) 2009-05-18T07:18:20Z 2009-05-18T07:18:20Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/15869 en Nanyang Technological University 63 p. application/pdf
spellingShingle DRNTU::Engineering::Environmental engineering::Waste management
Er, Aldred Guo Yao
Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title_full Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title_fullStr Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title_full_unstemmed Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title_short Three-phase anaerobic digestion system for co-production of bio-hydrogen and bio-methane from food waste
title_sort three phase anaerobic digestion system for co production of bio hydrogen and bio methane from food waste
topic DRNTU::Engineering::Environmental engineering::Waste management
url http://hdl.handle.net/10356/15869
work_keys_str_mv AT eraldredguoyao threephaseanaerobicdigestionsystemforcoproductionofbiohydrogenandbiomethanefromfoodwaste