Self-purification of soil

Self-purification of soil is a very complex process that depends on the structure, chemical composition, physical properties, bacterial flora and fauna soil.
The decisive role in the recycling of organic substances belong to the microbes. The decay of organic substances (protein) is carried out in two stages, through mineralization and nitrification.
The process of mineralization of organic substances can take place in aerobic conditions (when the access of oxygen) and anaerobic conditions (in the absence or insufficient quantity of oxygen). This organic matter decompose due to the activity of enzymes secreted by microbes, fungi, etc., under anaerobic conditions, processes of rotting and fermentation of organic matter are accompanied by allocation of malodorous gases (ammonia, hydrogen sulphide, methane and others), so soil disposal of waste should be performed using the aerobic process when the access of oxygen. In the process of mineralization kill the pathogens of infectious diseases, and the eggs of worms lose their viability.
The process of nitrification is the aerobic nitrifying bacteria. End-products generated by mineralization, under the influence of these microbes pass in complex chemical compounds needed for power plants.
At a certain stage of decomposition of organic substances formed a special product - humus (humus). The humus slowly decomposes and gives plants the necessary nutrients. He does not issue the stench and does not contain microorganisms, except spore.