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It is called wastewater to any solution that comes from waste. These can be domestic or industrial origin. In the case of industrial companies are prohibited from being deposited in inhabited areas, for several reasons. Firstly because they threatened public health and, secondly, because they ruin the aesthetics of the population. For these reasons must be sought to eliminate other channels, other than the conventional streams or lakes or ponds.

The waste water must be treated in a special way, since the organic elements that have needed to be eliminated, the activity of some special microorganisms that convert the organic matter into CO2. Thus, through treatment of wastewater, waste eliminating pathogens and prevents them from reaching rivers or drinking water sources (of which supply human beings). In this water treatment (biological) treatment is called secondary, because it involves two processes of microbiology: the of aerobes and anaerobes.

To correctly perform secondary treatment of water, must be passed through various processes performed by bacteria. These processes include digestion and fermentation carried out by these microorganisms, that are able to convert organic materials into carbon dioxide and methane gas. If methane gas is separated from the rest of the waste can be burned and used as energy source.

As CO2 and methane gas are volatile substances, significantly decreased the amount of organic substances from water. To check whether a process wastewater treatment was efficient or not, we express results in percentages. Should be measured initial BOD removal.

measured initial BOD removal.
Within the biological treatment of waste water we have, as mentioned earlier, two internal processes:
The anaerobic process: it depends on the transfer reactions. These transfers are inter-species H2.

The aerobic process: putting oxygen in irrigation, by agitation or aeration, or by any of them simultaneously. The organisms grow or degrade in proportion to the level of aeration. The mixed colonies of bacteria and fungi in waste water are formed based on organic and inorganic substances that cause turbidity. Thus the flocs are formed that upon receiving a decreasing agitation, reach the desired diameter, split and sink.