Since the crisis that happened in 2002, artisanal gold panning activity is practised on the minor and major bed of Cavally river in Zouan-hounien (Côte d'ivoire). This generating activity of income to the populations is done without respecting the environmental and social measures. However the water of the river is used by this population for food, bodily, agricultural needs. This study aims at evaluating the impacts of artisanal gold panning on the morphology and the quality of water of the Çavally river. Thus, the treatement of satellite images by teledetection software ang geographics informations systems, the analyze and the treatement, with SEQ-Water tool, for samples taken are used. It comes out from this study that surfaces of the sections of the river evolved/moved from 5,68%, in 1986, to 16,31%, in 2011. Between 2011 and 2018, surfaces of the sections increased by 16,39% to 55,93%. This study raises too that water of the Çavally river is of average quality. It thus allowed to propose an action plan to fight against the impacts of the artisanal gold panning on the quality of water while being based on the classification carried out according to the uses.

Ecological sanitation (Ecosan) consists in valuing human excreta as bio-fertilizer after treatment of feces by adding ash for composting and treatment of urine by storage in hermetically sealed containers. As schistosomiasis is endemic in the study area, the question is whether hygienization of schistosome-infected excreta is effective in eliminating them. The objective of the study is to determine the parasitic load of urine and feces, the parameters and the maximum time that influences the hygienization. A prevalence survey helped to identify and know the level of parasitic infestation of sick people. Full urine and ash-treated stool samples collected from infected persons were analyzed daily and every 15 days. The pH and temperature values of each urine sample were recorded. The results show that the eggs of S. haematobium and S.mansoni disappear respectively after 30 and 15 days of hygienization. The parameters that influence the hygienization are the increase of the pH and the oscillation of the temperature. Ecosan would be a solution to fight against schistosomiasis because the application of sanitized urine and feces breaks the cycle of transmission of the disease.

This study investigated anaerobic co-digestion of cassava liquid waste (very acid and poor in nitrogen) and human urine. Three experimental digesters were used: manioc effluent; manioc effluent + urine; manioc effluent + urine + cow dung.
All digesters have functioned with mesophilic temperatures between 24.0 and 35.6