Influence of time and oxygenation on the degradation of organic matter, nitrogen and phosphates during the biological treatment of slaughterhouse effluent

Removal of Organic, Nitrogen and Phosphate Pollutants from Slaughterhouse Effluent by a Process Combining Biodegradation with Adsorption

“…This elimination is significantly greater in the presence of oxygen than in the absence of oxygen. These results are in agreement with those of Djonga et al, [1] who already showed the positive influence of oxygenation of the medium on the rate of biodegradation of OM. however, they stated that oxygenation of the medium accelerated biodegradation without increasing the efficiency of its removal.…”

“…The efficiency aspect of OM removal was therefore corrected in this process by its retention on the adsorbent introduced into the reactors. Compared to the work of Djonga et al, [1], adsorption reduced the time required for OM elimination, from 9 days of treatment offered by biological treatment alone, to 2 days when combined with adsorption.…”

“…This leads to a decrease in the concentrations of ammonium, nitrate and nitrite in the effluent. The brief increase in nitrates observed at the end of the 1 st day of treatment is explained by the successive phenomena of nitrification of ammonium to nitrate, and nitration of nitrites to nitrates, before being reduced to N 2 during the 2 nd and 3 rd day of treatment [1]. However, there is a 2 nd phase of treatment in anoxia which goes from the 3 rd to the 5 th day.…”

“…Slaughterhouses are a case in point, where most of the water is used for cleaning the plant. But the wastewater that comes out is highly loaded with organic matter, nitrogen and phosphate [1]. The discharge of this wastewater without prior treatment constitutes a source of pollution for the environment with significant consequences on the social life of living beings.…”

“…In 2020, these same authors studied the influence of oxygenation on the biodegradation of the pollutants contained in this effluent. They showed that there is a minimum effective biological treatment time (9/27 days), beyond which biodegradation of pollutants is practically negligible [1]. However, this minimum effective biodegradation time has an average rate of <80%.…”