1.   In non-methanogenic subjects, sulphate reducing bacteria consume some of the hydrogen produced in fermentation.

2.   At the same time, but much more slowly, acetic bacteria consume the alcohol and transform it into acetic acid.

3.   Bacteria consume oxygen as they decompose sewage and other organic matter.

4.   The modernization effort includes a new bioenergy recovery system in which bacteria consume protein and carbohydrates in wastewater in order to produce methane.

5.   When they die, they are consumed by bacteria, which proliferate and drain the water of oxygen.

6.   The gas is quickly consumed by bacteria or absorbed into the bloodstream.