Caracterisation Physico-Chimique Et Microbiologique Des Boues De Vidange Deshydratees Et Des Dechets Solides Menagers Organiques Pour Une Valorisation en Compost Agricole

Abstract

In the city of Ouagadougou in Burkina Faso, faecal sludge treatment plants suffer from the lack of a process for recovering sludge after drying. Forsolid household waste, the quantities collected are mainly intended fortechnical landfill. Finding a solution for the recovery of Dewatered Faecal Sludge (DFS) and Organic Household Solid Waste (OHSW) is necessary in order to complete the faecal sludge management and solid waste management sectors. Our work aims to make a physico-chemical, microbiological and eco-toxicological study of a compost based on DFS and OHSW in order to propose a methodological approach for the sustainable production of hygienic compost. This article discusses the first step of our research, which consisted in characterizing the DFS at the Zagtouli treatment station as well as the OHSW of waste treatment and recovery center of Ouagadougou in order to identify a suitable recovery channel. To do so, a representative sample was taken from the Zagtouli DFS heap for laboratory analysis. The OHSW sample was obtained from household garbage bins from pre-collection centers in the city of Ouagadougou. The raw characteristics of DFS and OHSW (organic matter, nitrogen, pH, etc.) and their value in mineral elements (calcium, magnesium, potassium, phosphorus) show that these substrates would be ideal for the production of quality compost.

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“…The result of the study is similar to Wong et al (2001) who found that a C/N ratio value around or below 20 is satisfactory. Our results also corroborate with those of Soré (2018) who argued moreover that the C/N ratio for Dewatered Faecal Sludge (DFS) is at 18.99 ± 8.12. However, our results differ from those obtained by Haug (1993) whose results from this work showed that a C/N ratio between 25 and 35 allows for optimal composting.…”

“…This result is in accordance with the ADEME (2006) which confirms that the digestate produced is poor in organic matter [18]. The result of the study is very close to that found by Soré (2018) who shows that the Organic Matter content (%OM) is 25.62 ± 2.59 for Dehydrated Faecal Sludge (DFS).…”

“…This pH value of the digestate is related to the evolution of the reaction medium during the digestion process [16]. Our results are close to those found by Soré (2018) who states that the pH of composts from Solid Household Waste (SHW) is 7.85 ± 0.01 [17].…”

“…The result of the study about the Nitrogen content (0.68% DM) is consistent with that of M'Sadak and M'Barek (2015) whose results show that the Nitrogen (N) contents in compost, generally vary from 0.6% to 1.3% of the Dry Matter (DM) mass and of which 5% to 20% are directly assimilable. The result of the study about Potassium content (0.67% DM) is consistent with that of Soré (2018) whose results showed that the Potassium (K) content in compost based on Dewatered Faecal Sludge (DFS) was 0.74 ± 0.03. Our results corroborate with those found by Soré (2018) who argued that the Magnesium (Mg) content in the compost based on Dewatered Faecal Sludge (DFS) was 0.16 ± 0.02.…”

“…The result of the study about Potassium content (0.67% DM) is consistent with that of Soré (2018) whose results showed that the Potassium (K) content in compost based on Dewatered Faecal Sludge (DFS) was 0.74 ± 0.03. Our results corroborate with those found by Soré (2018) who argued that the Magnesium (Mg) content in the compost based on Dewatered Faecal Sludge (DFS) was 0.16 ± 0.02. For N, P and K content, the results of the study are close to half of the results found by FAO (1994) with a digestate containing 1.60% DM in Nitrogen, 1.40% DM in Phosphorus and 1.20% DM in Potassium.…”