Abstract: 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.Abstract: 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...Show More
Abstract: The objective of this work is to study the elimination of Methyl Orange (MO) contained in wastewater, by adsorption on four different adsorbents, produced from peanut shells. To achieve this, the various adsorbents were first produced. The native biosorbent (BN) was obtained from drying, crushing and sieving the peanut shells. The activated biosorbent (BA) was obtained by chemical activation with ortho-phosphoric acid (H3PO4) 10% BN. The activated carbons (CA1 and CA2) were obtained by pyrolysis at 650°C of BN and BA, respectively. The four products were characterized adsorbents and experiments to determine the effects of pH, contact time, of their masses and the concentration of methyl orange in its removal by adsorption was carried out. The results show that the thermal activation of the BN has multiplied its surface area by 11, while chemical activation has multiplied by its specific surface 8. Both treatment (chemical and thermal) have also tripled the micropores of BN. All four adsorbents have a maximum adsorption capacity at pH6. At this pH, the amount of MO adsorbed decreases with increase in its concentration, regardless of the adsorbent used. Likewise, adsorption equilibrium is reached at 3 min on the four adsorbents. The pseudo second order model describes the adsorption kinetics of MO on the four adsorbents. Ultimately, CA1 is found to be the most effective in removing MO from wastewater.Abstract: The objective of this work is to study the elimination of Methyl Orange (MO) contained in wastewater, by adsorption on four different adsorbents, produced from peanut shells. To achieve this, the various adsorbents were first produced. The native biosorbent (BN) was obtained from drying, crushing and sieving the peanut shells. The activated biosorb...Show More
