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Bioenergy > Lecture 15 > Flashcards

Lecture 15 Flashcards

1
Q

Best examples of anaerobic digestion are with ___

A

Solid waste from cows, chicken, and pigs

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2
Q

Process of anaerobic digestion

A

Microbes decompose the waste in a low oxygen (anaerobic) environment and produce methane

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3
Q

How much biogas can be yielded from 1 ton of manure

A

200-400 m3

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4
Q

How much of the biogas yielded from 1 ton of manure is methane

A

50-75%

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5
Q

Microbes that produce methane

A

Methanogens

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6
Q

Are methanogens the only bacteria involved in producing methane

A

No (mixture of bacteria is complex and poorly understood)

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7
Q

Stages of anaerobic digestion

A
  1. Hydrolysis
  2. Acidogenesis
  3. Acetogenesis
  4. Methanogenesis
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8
Q

Pyrolysis

A

Overused word to describe many different processes from straight burning to making bioliquids

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9
Q

In the industry, pyrolysis is the process of ____

A

Producing bio-oil

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10
Q

Bio-oil examples

A

Oils, acids, water, odd compounds

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11
Q

How is the pyrolysis process controlled

A

Under high heat (but gasification is minimized)

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12
Q

How is the bio-oil collected from the pyrolysis process

A

Vapors are collected and allowed to condense to liquids (the bio-oil)

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13
Q

Is the process of pyrolysis understood

A

No. Varying outcomes depending on the technology used

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14
Q

Fischer-Tropsch process

A

A German invention that produces liquid fuel from solid

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15
Q

Original starting material of the Fischer-Tropsch process

A

Coal

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16
Q

__ and __ are required for the Fischer-Tropsch process

A

Pressure and temperature

17
Q

Chemical conversion in Fischer-Tropsch process

A

Chemical conversion of gasification gases (H2 and CO) to alkanes in the presence of a catalyst

18
Q

Typical catalysts of chemical conversion of gasification gases in the Fischer-Tropsch process

A

Metals like cobalt and iron

19
Q

Length of alkanes resulting from chemical conversion in the Fischer-Tropsch process

A

Variable

20
Q

Small alkane chain

A

Gas (methane)

21
Q

How many carbons in a small alkane chain

A

1

22
Q

Big alkane chain

A

Waxy

23
Q

How many carbons in a big alkane chain

A

35

24
Q

“Sweet zone” of alkane length

A

5 to 16 carbons

Bioenergy (22 decks)

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