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PAES - Agricultural Structures > Agricultural Structures-BIOGAS PLANT > Flashcards

Agricultural Structures-BIOGAS PLANT Flashcards

1
Q

Used to process animal wastes or manure to produce biogas and sludge.

A

Biogas plant

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2
Q

Consisting of an

inlet/mixing tank, digester, gas chamber and outlet/sludge tank.

A

Biogas plant

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3
Q

Biogas plant where the digester and gas chamber form one unit.

A

Integrated plant

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4
Q

Digester and gas chamber form separate units.

A

Split-type Plant

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5
Q

Plant with series of digesters.

A

Multi-digester plant

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6
Q

Plant consisting of digester and a moving, floating gasholder that either float directly in the
fermenting slurry or in a separate water jacket.

A

Floating type

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7
Q

Closed digester with an immovable, rigid gas chamber and a displacement pit.

A

Fixed type

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8
Q

Plant consisting of a heat-sealed plastic or rubber bag, combining digester and
gasholder.

A

Balloon type

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9
Q

Chamber where manure and water are collected, stored and separated from heavy and non-
biodegradable materials before feeding them into the digester.

A

Collecting tank

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10
Q

Serves as conveyor of the manure-water mixture or slurry from the mixing tank to the digester.

A

Inlet pipe

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11
Q

Any water and air tight container designed for the process of anaerobic microbiological degradation of organic matter into which the slurry is introduced for digestion and methanization.

A

digester
biodigester
bio-reactor
anaerobic reactor

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12
Q

Division in the digester that prevent the slurry from premature exit into the sludge/outlet tank.

A

Baffle board

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13
Q

Mechanical device inside the digester used to stir the slurry.

A

stirrer
mixer
agitator

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14
Q

Space inside or outside the digester for the collection and storage of biogas.

A

Gas chamber

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15
Q

Cantilever beam that holds the gasholder/movable cover in position at the desired biogas
pressure.

A

Gasholder retainer

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16
Q

Serves as conveyor where the effluent or the slurry is forced out.

A

Outlet pipe

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17
Q

Layer of compacted soil and gravel to support the digester wall.

A

Backfill

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18
Q

Amount of slurry fed per unit volume of digester capacity per day.

A

Loading rate

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19
Q

organic material used to produce biogas

A

Substrate

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20
Q

adding or introducing anaerobic bacteria to the digester

A

Seeding

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21
Q

mixture of manure and water

A

Slurry

22
Q

difference in height between the digester wall and the filling line

A

Freeboard

23
Q

level of slurry when the digesters is at full load

A

Filling line

24
Q

average period that a given quantity of slurry is retained in the digester for digestion

A

Retention time

25
Q

materials that inhibit the normal growth of pathogens in the digester such as mineral ions, heavy metals and detergents

A

Toxic materials

26
Q

materials that inhibit the normal growth of pathogens in the digester such as mineral ions, heavy metals and detergents

A

Toxic materials

27
Q

various processes that take place among the methanogens, non-methanogens and substrates
fed into the digester as inputs

A

methanization

digestion

28
Q

anaerobic bacteria that act upon organic materials and in the process, produce biogas

A

Methanogens

29
Q

temperature range of 20 oC – 40 oC where mesophilic bacteria operates

A

Mesophilic temperature rage

30
Q

amount of biogas produced per day per cubic meter of slurry

A

Gas production rate

31
Q

mixture of gas (composed of 50 to 70 percent methane and 30 to 40 percent carbon dioxide)
produced by methanogenic bacteria

A

Biogas

32
Q

layer of floating material (mainly fibrous) on the slurry

A

Scum

33
Q

settled portion or precipitate of the slurry; a mud-like, semi-solid mass

A

Sludge

34
Q

residue that comes out at the outlet after the substrate is digested/processed inside the digester

A

Effluent

35
Q

The minimum diameter of the inlet pipe shall be

A

0.2m

36
Q

Retention time for liquid pig manure

A

15 to 25 days

37
Q

Retention time for liquid cow or carabao manure

A

20 to 30 days

38
Q

Retention time for liquid chicken manure

A

20 to 40 days

39
Q

Retention time for animal manure mixed with plant materials

A

50 to 80 days

40
Q

For Balloon Type:

The digester volume is ___% of the total digester volume is occupied by the slurry.

A

80%

41
Q

The minimum diameter of the outlet pipe shall be ___.

A

0.2m

42
Q

For fixed type, the volume of the outlet tank shall be ____ of digester volume occupied by the slurry.

A

1/3

43
Q

The tank should be concreted and a ______ should be provided to control or allow the proper mixture of water and manure.

A

Sluice gate

44
Q

The floor of the mixing tank should be inclined from ______ toward the inlet pipe and it should be elevated at least ___ from the filling line.

A

8.5% to 17.5% ; 0.2m

45
Q

Concrete pipe (prefabricated RC pipe) should be used and it should be inclined ____ with digester wall.

A

58%

46
Q

Lower end of inlet pipe should be positioned below the gasholder retainer for floating type. If there is no retainer, the lower end should be located ____ from the floor of the digester.

A

100mm

47
Q

Manhole cover should be _____ in

diameter and _____ thick.

A

0.65m ; 0.125m

48
Q

The floor shall have a slope of about ____ from the inlet to the outlet

A

2.5%

49
Q

The gas drum should consist of ____ mild steel sheets for the sides and ____ sheets for the top.

A

2.5 mm ; 2mm

50
Q

The gas drum should have a sloping roof of _____ and it should be provided
with guide frame.

A

16.5%

PAES - Agricultural Structures (21 decks)

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