Abstract
SBR (Sequencing Batch Reactor) treatment systems are made up of an artificial ecosystem where they develop the microorganisms under controlled and limited conditions, in which the pH, organic load and oxygen within the reactor vary spatially and in time. This causes the microbial population to be neither uniform nor constant and therefore reflects the conditions to which they have been exposed during the treatment system. Nitrifying and denitrifying bacteria in a SBR pilot system were monitored over 252 days, using two types of wastewater in the treatment; one with a high amount of organic matter and the other with a high amount of ammonium, both originating from a meat product processing plant. The two types of wastewater were mixed in different proportions with the aim of varying the organic and ammoniacal loading in the influent, thus allowing the most suitable conditions for obtaining high removal efficiencies in the combined treatment of organic matter and ammonia to be determined. The results showed efficiencies of 99%, 98% and 71% in COD F, BOD 5 and NH 4 +–N, respectively, and a microbial density of about 2.35 × 10 7 MPN/100 mL for nitrifying bacteria and 2.25 × 10 7 MPN/100 mL for denitrifying bacteria.
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