APPLICATION OF THE DISCRETE LEAST SQUARES METHOD TO MEASUREMENTS OF CHEMICAL OXYGEN DEMAND IN TANNERY EFFLUENTS

The tanning process is the process of treatment and transformation of animal skin into leather, where said process resides especially in the addition to the skins of a series of tanning products such as chrome salts, among others. In this sense, it can be said that, in the present investigation, the physicochemical and microbiological behavior of the reactor was studied during the leather process in the industries, which has been increasing this activity in the behavior of the wastewater produced by the producers. leather, taking into account that they need more efficient systems for the treatment of effluents generated in this sector. This is how, for the development of this research, a reactor was managed per load with a useful volume of 2 liters that worked in aerobic circumstances with 24-hour cycles. Likewise, for the development of this investigation, it was possible to progressively increase the concentration of the effluent from the tannery, taking into account the DQO and the count of heterotrophic microorganisms, which were the main variables studied during the investigation. Finally, biodegradable DQO removals achieved at the end of the acclimatization process were 57.9% for DQOt and 76.8% for DQOs, also presenting little significant amount of heterotrophic bacteria in the effluent.