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Bacterial hydrolysis and methane fer...

Stanford University.

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Bacterial hydrolysis and methane fermentation of lignocellulosic materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Bacterial hydrolysis and methane fermentation of lignocellulosic materials./
作者:	Tong, Xinggang.
面頁冊數:	224 p.
附註:	Adviser: Perry L. McCarty.
Contained By:	Dissertation Abstracts International53-07B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9234175

Bacterial hydrolysis and methane fermentation of lignocellulosic materials.
Tong, Xinggang.

Bacterial hydrolysis and methane fermentation of lignocellulosic materials. - 224 p.

Adviser: Perry L. McCarty.

Thesis (Ph.D.)--Stanford University, 1992.

In order for methane fermentation of lignocellulosic materials to be an effective method for providing both a renewable energy source and a means to reduce the volume of municipal solids wastes, a better understanding of the fermentation process is required, because this process has been generally observed to be a slow and incomplete one. This dissertation focused on understanding of the rate-limiting mechanisms of methane fermentation, including the influence of the type of lignocellulosic materials, bacterial culture characteristics, bacterial concentration, pH, and temperature.Subjects--Topical Terms:

783781
Engineering, Civil.

Bacterial hydrolysis and methane fermentation of lignocellulosic materials.
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245 1 0 $a Bacterial hydrolysis and methane fermentation of lignocellulosic materials.
300 $a 224 p.
500 $a Adviser: Perry L. McCarty.
500 $a Source: Dissertation Abstracts International, Volume: 53-07, Section: B, page: 3383.
502 $a Thesis (Ph.D.)--Stanford University, 1992.
520 $a In order for methane fermentation of lignocellulosic materials to be an effective method for providing both a renewable energy source and a means to reduce the volume of municipal solids wastes, a better understanding of the fermentation process is required, because this process has been generally observed to be a slow and incomplete one. This dissertation focused on understanding of the rate-limiting mechanisms of methane fermentation, including the influence of the type of lignocellulosic materials, bacterial culture characteristics, bacterial concentration, pH, and temperature.
520 $a Lignocellulosic materials selected for this study were: corn stover, wheat straw, napier grass, wood grass, newspaper, and white fir. Four methanogenic cultures grown on monosaccharides, purified holocellulose, wheat straw, and mixed municipal sludge, respectively, were developed at 35$\sp\circ $c and neutral pH.
520 $a Each of the four bacterial cultures developed a glucose and cellobiose consumption potential higher than the methanogenic potential, which in turn was higher than the lignocellulosic hydrolysis potential. Further examination of lignocellulosic hydrolysis revealed that it is the step in which bacteria and enzymes open the lignocellulosic matrix so that hydrolytic enzymes can have access to holocellulosic polymers that limits the hydrolysis rate. Microscopic examination revealed that hydrolysis appears to have occurred only at the points of physical contact between the hydrolytic bacteria and the particle surface.
520 $a Both fermentation rate and extent were greatly influenced by the lignocellulosic material used and by pH and temperature, but they were much less affected by the bacterial culture employed. Lignocellulosic hydrolysis reached a maximum rate at relatively low bacterial concentrations. Both hydrolysis and fermentation processes can be adequately modeled by a first-order rate equation. Linear correlations between lignin content and biodegradability or methane conversion rate were very poor, with correlation coefficients (r$\sp2)$ of 0.6 and 0.82, respectively, for the lignocellulosic materials studied.
520 $a Both hydrolysis and methanogenesis had an optimum pH near neutral for the cultures studied. It is therefore unnecessary to separate the hydrolysis process from the methanogenic process. Based on the findings of this research, a reactor system consisting of a continuously-stirred tank reactor followed by a plug-flow reactor with methane production in both is recommended for commercial application of methane generation from lignocellulosic materials. Laboratory studies confirmed the advantages of this system.
590 $a School code: 0212.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Sanitary and Municipal. $3 1018731
650 4 $a Environmental Sciences. $3 676987
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690 $a 0554
690 $a 0768
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 53-07B.
790 $a 0212
790 1 0 $a McCarty, Perry L., $e advisor
791 $a Ph.D.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9234175