Discolouration Studies of the Slaughterhouse Effluent by Adsorption on Two Adsorbents Made from Species Sawdust of Triplochiton scleroxilon and Milicia excelsa

Abstract

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.

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

“…The adsorbent used in this work was produced on the basis of sawdust from Triplochyton scleroxylon (Ayous). It was produced and characterized by Djonga et al [10]. Its characteristics are presented in Table 1.…”

“…Then the adsorbent was introduced into each reactor at a ratio of 2g/L. This amount of adsorbent corresponds to the minimum and effective amount for adsorption, obtained by Djonga et al, [10]. The contents of the two reactors were stirred at 100 rpm.…”

“…To achieve this, it was necessary to assess the level of efficiency of the adsorption on the removal of certain pollutants contained in the slaughterhouse effluent. This objective has been explored by Djonga et al, [10,11] with satisfactory results. In 2020, these same authors studied the influence of oxygenation on the biodegradation of the pollutants contained in this effluent.…”

“…This is what justifies the idea of combining this biological treatment with adsorption. One of the objectives of the work of [10,11] was also to test the effectiveness of adsorbents made from sawdust of several species of wood. As a result of this work, the Triplochyton scleroxylon based adsorbent (Ayous) showed very interesting results.…”