Sánchez Sánchez, Guillermo LeónGil Garzón, Miriam JanetGil Garzón, Maritza AndreaGiraldo Rojas, Francisco JavierMillán Cardona, Leonidas de JesúsVillada Ramírez, María Eugenia2012-07-172012-07-172012-07-171909-0455http://hdl.handle.net/10567/551Introduction. Environmental pollution produced by the disposal of the serum that results from dairy industries activities is a motivation for keeping on searching for effective technologies that allow the use of this sub product. The use of efficient micro organisms usually used to transform the soil, recovery of agricultural and farming resources and water treatments, can be an alternative for a company located in the North of Antioquia, Colombia, which produces great quantities of serum per year and does not have an effective treatment for it, causing environmental problems. Objective. To transform mil serum obtained from a dairy company located in the North of Antioquia by the use of efficient micro organisms, aiming to reduce the contamination produced by this process remain. Materials and methods. Efficient micro organisms of the lactobacillus type were applied to the salty serum produced in a company from the Northern Antioquia region. The serum was treated at 94°C and the phases formed were separated with a filtration. The initial and precipitated serums were characterized by the application of physical, chemical and bromatological analysis procedures. Result analysis. Efficient micro organisms help to separate two stages: An inferior stage or precipitation represented by the 7.10%, in which a protein increase is observed (from 0.86±0.04% to 6.58±0.05% after the treatment) due to the hydrogen fixation and concentration capacity of the micro organisms. The second stage, which takes place at a liquid state, was characterized in order to determine the reduction of the value corresponding to the chemical oxygen demand (COD). A 98% measure was achieved. Conclusion. The use of efficient micro organisms is an alternative for the treatment of serum, as an organic waste from dairy industries, because it allows the recovery of a phase (7.10%) which represents a protein increase that can be used for obtaining other products for human an animal consumption. Besides, an approximately 98% COD removal rate is achieved in the liquid stage, avoiding an environmental risk.esLactobacillusSubproducto de la lecheMicroorganismos eficientes (EM)Corporación Universitaria LasallistaÁrea Metropolitana del Valle de AburráDemanda química de oxígeno (DQO)Article