Some Physical and Chemical Properties of Bio-fertilizers

Animal slurry is widely used as a fertilizer in organic farms. Dairy cattle typically produce between 42 kg and 64 kg (depending on body weight) of manure per day, so if they are housed for 50% of the year that corresponds to 7.6-11.6 tonnes per cow. In many developing nations, animalfaeces have been composted and used to fertilize farm fields. Many factors, including the type and concentration of substrate, temperature, moisture, pH, etc., may affect the performance of the anaerobic digestion process in the bioreactor. The anaerobic digestion of organic waste is also an environmentally useful technology.described the benefits of this process to reduce environmental pollution in two main ways: the sealed environment of the process prevents exit of methane into the atmosphere, while burning of the methane will release carbon–neutral carbon dioxide (no net effect on atmospheric carbon dioxide and other greenhouse gases).

On the other hand, the anaerobic process has some disadvantages such as long retention times and low removal efficiencies of organic compounds. Consequently, various physical, chemical and enzymatic pretreatments are required to increase substrate solubility andaccelerate the biodegradation rate of solid organic waste. In the described manner of treating the liquid manure its temperature is augmented; our findings show that in the summer time that it is possible to supply the air from outside the barn to the aerator pump whereas in winter it is recommendable to supply warmed air from the barn interior. In this way the liquid manure heating is accelerated and at the same time the barn microclimate, from which the bad smell is removed, is improved.