what is the meaning of anaerobic digestion?

Answer 1

It is the breakdown of wastes by anaerobic bacteria.
Aerobic bacteria use free dissolved oxygen (O2) in their life processes while anaerobic bacteria survive without free oxygen. Instead, they get their oxygen supply by breaking down wastes and converting them to other products. For example, they convert carbon dioxide (CO2) to methane (CH4) or sulfates (SO4) to hydrogen sulfide (H2S).

In the anaerobic process, there is a type of bacteria (acid-forming) that converts organic wastes into organic acids. In another stage, there is another type of bacteria (methane fermenters) that convert organic acids into by-products, like methane, carbon dioxide, and hydrogen sulfide.

Answer 2

This would more properly be called anaerobic respiration.. Anaerobic bacteria can obtain energy without using oxygen. However, our cells do this too. Glucose is broken down into lactic acid. This process yields 2 ATP (Adenosine Tri Phosphate). The ATP molecule is like a battery inside the cell and it is used to store energy. When the cell needs energy it breaks down the ATP into Adenosine Di Phosphate and Adenosine Monophosphate. The more energy you get from a process the more ATP molecules you get.

In the second aerobic step oxygen is used to convert the lactic acid into carbon dioxide and water. During strenuous exercise the first step can outpace the available oxygen and the resulting lactic acid can build up in the muscles. This is what causes a "charlie horse" or cramping in the muscles when you get short of breath when exercising.

During the first anaerobic step only 2 ATP are created. However, during the next step of aerobic respiration you get 38 ATP. So, to get the bulk of the available energy you need oxygen. This is why there are no animals that rely only on anaerobic respiration; this process doesn't yield enough energy to sustain larger organisms. There are single celled organisms like bacteria and yeast that are capable of surviving with no oxygen using only anaerobic respiration.

In the first step, our cells work the same way as Streptococcus and Lactobacillus bacteria which also produce lactic acid as a byproduct. Other anaerobic organisms can produce other byproducts including acetic acid, alchohol, and methane. Bacteria that produce lactic and acetic acid are what create yogurt, sauerkraut, and pickles. Yeast that produce alcohol create beer and wine. These alcohol producing yeast also produce carbon dioxide which makes bread rise and makes beer fizzy.

Answer 3

Aerobic means 'with oxygen', so aerobic excercise is excercise to encourage oxygen into your blood stream.

Anaerobic means 'without oxygen', which is the contrary.

Digestion is 'the breakdown of energy sources to convert to energy'.

Therefore, Anaerobic Digestion is the breaking down of food in the abscence of oxygen. Worms, slugs, and snails are a good example.

Mammals and Animals require Oxygen flow to complete this bodily function properly.

Answer 4

you mean anaerobic RESPIRATION. (not to be confused with the respiratory system)

digestion is the breakdown of large food particles into the composite molecules which are small enough to be absorbed by the cells lining the digestive tract. These molecules are then used by various biochemical pathways to produce energy and produce the proteins that each cell is designed to make.

anaerobic respiration occurs without the presence of oxygen to "pull" energy from chemical bonds of organic molecules such as glucose. This form of metabolism is found in bacteria that live in deep water, soil, wounds etc. The energy molecule it produces is known as ATP and it can only produce 2 of them so it is very inefficient compared to aerobic respiration.

aerobic respiration requires a respiratory system to flood large multicellular organisms with enough oxygen so that oxygen atoms can act as the final acceptor of electrons. This form of respiration produces 38 ATP, so is far more efficient for a large animals needs, ie by removing electrons it creates an energy gradient down which energy is removed from glucose in a series of steps that stop us blowing up like bombs.

Answer 5

Anaerobic digestion is the bacterial decomposition of organic matter without oxygen.

Answer 6

Anaerobic means without air/oxygen. Are you sure you mean digestion?

Answer 7

In the wastewater field, it refers to the placing of excess bacteria from a biological treatment facility in a tank with minimal oxygen (<1 mg/L). The purpose is to reduce the amount of bacteria present in the mix so that when you collect the waste bacteria for dosposal, there is a smaller amount. This happens by the bacteria using the other bacteria as a food source. See this link


http://web.deu.edu.tr/atiksu/toprak/ani4132.html

Answer 8

I'm guessing digestion without oxygen present. You might want to check me on that one, though.

Answer 9

it is a process of digestion in the absence of air or oxygen.

Answer 10

http://en.wikipedia.org/wiki/Anaerobic_digestion