Title: Biological treatments

Aerobic systems

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The presence of O2 makes this element an electron acceptor, which is why high energy yields are obtained, causing a significant generation of sludge, due to the high growth of aerobic bacteria. Its application to wastewater treatment can be highly conditioned by the low solubility of oxygen in the water.

Anaerobic systems

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In this case, the electron acceptor can be CO2 or part of the organic matter itself, obtaining as a product of this reduction carbon is its lowest state, CH4. The use of this system would have, as will be explained, as an important advantage, obtaining a fuel gas.

Anoxic systems

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This is the name given to systems in which the absence of O2 and the presence of NO3- make this last element the electron acceptor, transforming, among others, into N2, a completely inert element. Therefore, it is possible, under certain conditions, to achieve a biological elimination of nitrates (denitrification).