This study focused on the characterization of digestates resulting from anaerobic digestion of manioc effluents from attiéké factories. Two types of digestate were characterized, one consisting of manioc effluent + urine and another composed of manioc effluent + urine + cow dung. As a result, these residues of bio-digestion rich in nutrients (NPK) can be used as agricultural fertilizer. Moreover, the determination of some microorganisms and heavy metals digestates allowed to better appreciate its fertilizing quality. These parameters remained in accordance with the quality standards of a digestate prescribed. These results show that digestates from anaerobic co-digestion of manioc effluents, urine and cow dung can be used without fear as an agricultural biofertilizer.
The control of the anaerobic digestion of cassava residues from attiéké factories requires their characterization to offer a better working environment to attiéké producers. This study concerns at first the quantity of solid residues of cassava, dough of crushed cassava and other waste generated by the process of attiéké production. The second aspect concerns the determination of some physicochemical parameters (COD, TKN, pH, COD/TKN). These two aspects were realized thanks to the use of a bag in synthetic fibers, a dynamometric steelyard with dial of diameter 17 cms, and the use of a gradual can of capacity 20 L. The results of this study showed that an average quantity of 1.53 tonne of manioc handled (treated) generates 1.14 m 3 of effluents and 0.16 tonne of solid waste per day. These effluents are acid with a pH ranged between 2.54 and 4.80. So they have on average a DCO of 58.79 g/L for 0,71 g/L of nitrogen. All these parameters help control the optimal conditions of anaerobic digestion of cassava effluents in the manufacturing process of attiéké.
The department of Bouaflé is increasingly faced with health problems related to inadequate family sanitation. This situation creates high risks of high mortality and morbidity. In order to help significantly reduce these risks, EAA has initiated a project to promote family sanitation, ecological sanitation latrines (EcoSan) and the reuse of its by-products in agriculture in several villages in this department. The objective of this study is to assess the sustainability of ecological sanitation in rural areas in the said department. In order to achieve this objective, in addition to the literature review, this study was part of a mixed approach mobilizing related techniques and tools. The results obtained revealed that full latrine coverage and hand hygiene are not effective in all households.The factors contributing to the maintenance of the status of end of defecation in the open air in rural areas, especially the use of by-products in agriculture, are problematic. However, some of the households using the hygienized human excreta (HHE) show that crops fertilized by HHEs grow faster, the leaves of the plants are greener, have larger grains and fruits with a good taste when ripe. In addition, they control several pathogens, particularly Swollen Shoot in cocoa plantations.
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