Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:ir.lib.uwo.ca:etd-7628". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Western Ontario

1. Haroun, Basem Mikhaeil Fawzy. Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition.

Degree: 2018, University of Western Ontario

The growing concerns regarding climate change, population growth, depletion of fossil fuel, and pollution arising from the combustion of petroleum-based fuel can be identified as the most important factors driving the urgent need for environmentally friendly renewable energy. Among all the recognized alternatives to gasoline-based fuel, hydrogen is not only considered as a clean energy but also it has a high energy content of 142 kJ/g which is almost three times higher compared to other fossil fuels. Only water and heat are the by-products of hydrogen combustion. Dark fermentative hydrogen production is a feasible option in which inexpensive, low-grade, carbohydrate-rich, and renewable lignocellulosic biomass can be used as a substrate and anaerobic digester sludge (ADS) as a seed for biohydrogen production. Lignocellulosic substances are abundant in nature and are suitable for dark fermentative hydrogen production. Pretreatment of these carbohydrate-rich materials is required to get rid of lignin and increase the readily biodegradable sugars required for fermentation. There are several methods to break down the rigid structure of lignin and increase the fermentable sugar content. Although chemical treatment may be appropriate, it produces not only readily biodegradable sugars but also other by-products which inhibit microbial growth. The main purpose of this study was to assess the significance of acclimatization and the impact of furfural inhibition in both batches and continuous-flow systems for biohydrogen production from synthetic lignocellulosic hydrolysates. First, acclimatization of ADS was tested for biohydrogen production in a patented continuous-flow system known as integrated biohydrogen reactor clarifier systems (IBRCS), and in batches. IBRCS, R1, was fed initially with glucose at a concentration of 10 g/L (phase 1) and then the feed was switched to a mixture of C6 and C5 sugars: glucose, cellobiose, xylose, arabinose at a concentration of 2.5 g/L each (phase 2) and then the feed reverted to glucose at the same concentration of 10 g/L (phase 3). The results showed that hydrogen production yields were negatively affected by changing the feed substrates, despite their biodegradability. Additionally, propionate, which is not favorable for both biohydrogen and biomethane production, was predominant as a result of feed changes. This was evident by microbial community analysis which revealed that the propionate-producing Megasphaera were predominant while the hydrogen and acetate-producing bacteria i.e. Clostridium were washed out after switching substrates in phases 2 and 3. On the other hand, neither hydrogen yields nor volatile fatty acids (VFAs) distribution was negatively affected in the batch study, but rather changing the feed from mono substrate to co-substrate enhanced the hydrogen production yields. A confirmation experiment has been conducted in IBRCS, R2, to investigate the effect of feed changes on the acclimatized anaerobic hydrogen-producing mesophilic mixed cultures where the system was…

Subjects/Keywords: lignocellulosic hydrolysates; dark fermentative hydrogen production; acclimatization; inhibition; furfural; continuous-flow system; batch; microbial community analysis; Chemical Engineering; Environmental Engineering

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Haroun, B. M. F. (2018). Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/5641

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Haroun, Basem Mikhaeil Fawzy. “Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition.” 2018. Thesis, University of Western Ontario. Accessed December 15, 2018. https://ir.lib.uwo.ca/etd/5641.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Haroun, Basem Mikhaeil Fawzy. “Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition.” 2018. Web. 15 Dec 2018.

Vancouver:

Haroun BMF. Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition. [Internet] [Thesis]. University of Western Ontario; 2018. [cited 2018 Dec 15]. Available from: https://ir.lib.uwo.ca/etd/5641.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Haroun BMF. Biohydrogen Production from Synthetic Lignocellulosic Hydrolysates: Acclimatization and Inhibition. [Thesis]. University of Western Ontario; 2018. Available from: https://ir.lib.uwo.ca/etd/5641

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.