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The treatment of slaughterhouse effluents is a problem for our municipalities and residents. The objective of this work is to contribute to the protection of the environment through a test treatment of the effluent from the slaughterhouse of cows by adsorption on adsorbents made from sawdust. To achieve this, two adsorbents were produced based on sawdust of Ayous (Triplochiton scleroxilon) and Iroko (Milicia excelsa), and were characterized. The effluent was sampled in a Ngaoundéré slaughterhouse and then characterized in its turn. Finally, discolouration tests by adsorption of this effluent were carried out. At the end of this work, it appears that both adsorbents produced had an acidic character. They are micro and macroporous with specific surface areas from 14.77 m2/g to 69.56 m2/g for Iroko and Ayous, respectively. The effluent from the slaughterhouse of cows sampled in the city of Ngaoundéré is highly conductive and turbid with an organic matter evaluated at 4.15 ± 0.18%. The adsorbent based on sawdust of Ayous is more effective, globally allowed the reduction of more than 70% of all the organic and inorganic loads of the slaughterhouse effluent after treatment. A discolouration rate estimated at more than 90% obtained at the scale of the laboratory, these adsorbents are effective for the treatment of the slaughterhouse effluents. These two adsorbents can therefore be used for the treatment of slaughterhouse effluent in any country in the world.

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Improving the efficiency of slaughterhouse effluent treatment processes is an ongoing quest. The objective of this work is to assess the efficiency of the treatment process, combining biodegradation and adsorption, on the elimination of organic, nitrogen and phosphate loads contained in the slaughterhouse effluent. To achieve this, a slaughterhouse effluent was sampled in the town of Ngaoundéré (Cameroon). after characterization, it was then introduced into two reactors operating in batch and with stirring, with the adsorbent produced based on sawdust of Triplochyton scleroxylon (Ayous). One of the reactors operated in the absence of oxygen (anoxia) and the other in the presence of oxygen (aeration). Then the effluent was characterized daily during the five-day treatment. The results obtained show that the pH of the effluent varies between 6.5 and 8 in the two reactors during the treatment. an oxygenating effect of the environment was observed both on the elimination of organic matter and on that of nitrogen pollution. Turbidity reduction rates vary from 77.3% in anoxia to 94% in aeration at the end of the five days of treatment. This process, which combines biodegradation with adsorption, reduces the biological treatment time of slaughterhouse effluent from more than 3 weeks to 2 days, with satisfactory efficiency in removing organic and nitrogen loads.