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Anaerobic digestion of onion processing waste and biochemical methods for enhanced anaerobic digestion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Anaerobic digestion of onion processing waste and biochemical methods for enhanced anaerobic digestion./
作者:	Romano, Rowena T.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2008,
面頁冊數:	149 p.
附註:	Source: Dissertations Abstracts International, Volume: 70-04, Section: B.
Contained By:	Dissertations Abstracts International70-04B.
標題:	Agricultural engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3317966
ISBN:	9780549665892

Anaerobic digestion of onion processing waste and biochemical methods for enhanced anaerobic digestion.
Romano, Rowena T.

Anaerobic digestion of onion processing waste and biochemical methods for enhanced anaerobic digestion. - Ann Arbor : ProQuest Dissertations & Theses, 2008 - 149 p.

Source: Dissertations Abstracts International, Volume: 70-04, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2008.

Anaerobic digestion is a bioconversion technology applicable to the treatment of food-processing and agricultural residues. Anaerobic digestion produces biogas, which contains methane that can be used as a source of renewable energy. Two methods were investigated to enhance the methane yield and volatile fatty acid (VFA) production from onion waste from an onion processing plant. The first treatment method utilized an Anaerobic Phased Solids Digester, which yielded 0.31 L CH4/g of volatile solids (VS) at an organic loading rate (OLR) of 2 gVS/L/d. However due to limitations of the system at higher OLRs, a second treatment method was investigated in which the onion waste was fractionated into liquid and solids, and treated separately. The onion liquid was co-digested with wastewater sludge in an anaerobic mixed biofilm reactor. The wastewater sludge was used to lower the substrate carbon to nitrogen ratio to 15. At OLRs of 1.5 to 3.5 gVS/L/d the average methane yield was about 0.37 L CH4/gVS. Thus separate treatment of the onion liquid allowed higher OLRs and higher methane yields to be achieved. The separated onion solids were treated in an acidogenic fermenter for the production of VFAs. At an OLR of 4 gVS/L/d a maximum concentration of 12 g VFA/L was attained. The VFAs can be further converted to biogas or can be extracted from the effluent as a value-added product. Biochemical methods to increase the conversion of lignocellulosic material to biogas were also investigated. Clostridium cellulovorans, a highly cellulolytic bacterium, was bioaugmented into batch anaerobic digesters treating onion solids. The bioaugmented treatments resulted in slightly lower methane yields when compared to the non-bioaugmented treatments possibly due to inhibition of the methanogenic population. In another study cellulase and β-glucosidase was added to different anaerobic digester configurations for the treatment of wheatgrass. Addition of cellulase caused slightly higher biogas yields during digestion, but there were no significant effects on the biogas and methane yields by the end of the digestion period. These studies demonstrated a potential to enhance anaerobic digestion through biochemical methods, however further studies are recommended to determine their effects under varying conditions.

ISBN: 9780549665892Subjects--Topical Terms:

3168406
Agricultural engineering.
Subjects--Index Terms:

Anaerobic digestion

Anaerobic digestion of onion processing waste and biochemical methods for enhanced anaerobic digestion.
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