Biological wastewater treatment plant

NITRIFICATION - DENITRIFICATION (N-DN): Consists in separating fractions at 250 or 80 microns depending on the type of slurry and physiological state of the animals. The solid fraction, with a high nitrogen load, we will use it for composting. And the liquid fraction will be used to the bacterial nitrification-denitrification cultivation, which will be located in a bioreactor of about 20 days of TRH. This reactor will have mechanical aeration and homogenization controled by a timer. We will meet the following stages in each “batch” of the SBR type process (“Sequencing Batch Reactor”): a. Liquid fraction input: The effluent dose from the separator comes to the reactor. The aeration will be stopped and the homogenization agitation in operation. b. Denitrification: The anoxic microbial activity degrades organic matter using nitrates (NO3-). They were previously generated for anaerobic respiration. It generates N2 (denitrifies) that is released into the atmosphere. NOTE: At this first stage of microbiological activity, immediately after the entry of the liquid fraction, in order to optimize the greatest transformation of organic matter, that occurs in these anoxic conditions, without air supply. And therefore, with the minimum energy consumption. At the same time, good bacterial activity of denitrifiers produce a high denitrification index. c. Nitrification: Aerobic microbial activity that oxidizes the ammonium (NH4+) generated in the previous stage, in addition to that which already directly involves the liquid fraction of the slurry, to NO3-. These bacteria do not require organic matter, as they are autotrophic.