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

Weldi Gnowe Djonga,Eric Noubissié,Guy Bertrand Noumi,Inna Samomssa

doi:10.5296/emsd.v8i3.15000

Weldi Gnowe Djonga, Eric Noubissié + Show 2 more

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https://doi.org/10.5296/emsd.v8i3.15000

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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.

Highlights

Slaughterhouses of cows produce effluents heavily loaded with organic matter, which constitute a significant source of pollution for the environment where they are rejected (Bamba et al, 2009)
It is the difference in structural shape of the pores observed in the two adsorbents that justifies the predisposition of Ayous to more friability and fragility compared to Iroko, as observed in Figure 1(a and d)
The pH values obtained in this work are comparable to the pH values obtained by Daoud and Benturki (2014) on activated carbon produced from jujube kernels

Summary

Introduction

Slaughterhouses of cows produce effluents heavily loaded with organic matter, which constitute a significant source of pollution for the environment where they are rejected (Bamba et al, 2009). In the classification of pollutant generators, food industries (including slaughterhouses of cows) are considered as the main sources of biodegradable organic pollutants in waters, whether insoluble or dissolved (Labioui et al, 2007). This kind of pollution can be treated by electrocoagulation-flotation with iron electrodes (Khennoussi et al 2011). Gongwala et al, (2012) tried to treat slaughterhouse effluent by cold plasma with rampant electric discharge (glidarc) in Yaoundé. They obtained encouraging results on the reduction of BOD5 and COD. In 2014, these same authors try the same treatment for the elimination of phosphates and nitrates in the effluent of the slaughterhouse, with a despondency assessed at 86% and 42% respectivelly (Gongwala et al, 2014)

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