Category Archives: Biofuels from Agricultural Wastes and Byproducts

Dried Distillers ’ Grains and Solubles (DDGS)

Dry and wet mill ethanol production from corn starch is regarded as an essentially mature technology for producing bioethanol. Currently, dry-grind ethanol plants produce the majority of ethanol fuel (ca. 60%) in the United States. With concerns regarding net energy balance and food compared to fuel debate, ethanol production from corn is expected to stabilize (von Braun 2007). Some incremental […]

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Biological Processing of Cellulosic Biomass to Ethanol

Biological conversion of cellulosic biomass to ethanol is summarized here to provide a context for understanding some of the key features of agricultural residues and their impact on producing fuels, with more details available elsewhere (Valkanas et al. 1977; Fan et al. 1981; Gould 1984; Gusakov et al. 1992; Saddler 1993; Asghari et al. 1996; Baghaei-Yazdi et al. 1996; Belkacemi […]

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Biofuels from Agricultural Wastes and Byproducts

The demand for energy is rising and given that energy demand is projected to keep rising with constrained oil supplies, oil prices seem unlikely to fall significantly in the near future. Because 60% of U. S. petroleum supplies are imported, there is a need to develop alternative fuel supplies for future energy demands. Bioenergy has become a subject of increasing […]

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ASBRs

Our lab has experience with treatment of swine waste with ASBR technology, and therefore we will use this technology as an example of a high-rate anaerobic digester system on the farm (Garcia and Angenent 2009). The ASBR is a single-vessel system that requires no feed — distribution and gas-solids-separation systems, which simplify its design (Figure 4.2). However, intermittent mixing is […]

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Fuel and Chemical Production from Glycerol, a Biodiesel Waste Product

Syed Shams Yazdani, Anu Jose Mattam, and Ramon Gonzalez Abstract Glycerol (or glycerin) is a byproduct of biodiesel, oleo-chemical, and bioethanol production processes. Due to the tremendous growth of the biofuel industry, glycerol is now regarded as a waste product, often with a disposal cost associated with it. Glycerol is abundant and inexpensive, and it is also a highly reduced […]

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Components of an Inbound Logistics of Agricultural Feedstocks

The design of inbound logistics of feedstock delivery must consist of the following three unit operations: a sampling station, an unloading station, and storage space. The design layout and accompanying equipment will depend on the type of feedstock to be processed. For lignocellulosic feedstocks such as plant biomass or woods, the form in which the feedstock is delivered will determine […]

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Feedstocks and Their Primary Compounds

Agricultural biomass and biowaste include crop residues and wood, food processing waste, animal manure, and algae. Crop residues and wood primarily contain lignocellulose, while animal and food processing waste contains lipids, protein, and usually small amounts of lignocellulose (except ruminant animal manure). In this section, the primary compounds and structure in these feedstocks will be summarized and the potential functions […]

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Butanol Production from Lignocellulosic Biomass

Thaddeus C. Ezeji and Hans P. Blaschek Abstract As the worldwide demand for fuels and chemicals surges and petroleum deposits are depleted, producers of ethanol fuel are increasingly looking beyond corn, potatoes, and other starchy crops for substrates for ethanol fuel production. Ethanol is currently the most important renewable liquid biofuel, but it has problems ranging from lesser energy content […]

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