This study focuses on the evaluation of the ammonia(NH_(3))stripping and the sizing of a sludge treatment plant,based on experimental results obtained at the station Sonfonia(Conakry,Guinea),based on the Heins-Coll mo...This study focuses on the evaluation of the ammonia(NH_(3))stripping and the sizing of a sludge treatment plant,based on experimental results obtained at the station Sonfonia(Conakry,Guinea),based on the Heins-Coll model.The targeted physicochemical parameters are temperature,the pH and nitrogenous forms NH_(3)/NH_(4)^(+).The nitrogen stripping process is described using the Azov and Goldman mathematical model,which allows for the estimation of the concentration of stripped ammonia nitrogen(N-NH_(3))as a function of temperature and pH.The methodology is based on sampling the liquid fraction at different levels of the station,followed by physicochemical analyses and a comparative interpretation of the results.The average results obtained for the period 2022-2023 at the plant inlet are as follows:temperature of 29.71℃,pH of 7.74,and NH_(3)concentration of 28.76 mg/L.These values show that the ammonia load of the incoming sludge is significantly lower than that considered in the initial design of the plant(142 mg/L).Monitoring the flow of the effluent through the four lagoons reveals a progressive decrease in concentrations,with average values of 29.66℃ and pH of 7.66.And NH_(3)of 16.91 mg/L,reflecting a significant purification performance of the lagoon system.Nitrogen stripping tests were conducted in 2023 at Lagoon 1,based on six observation points.The application of the Azov and Goldman model yielded the following results:temperature of 32.15℃,pH of 9.62,NH_(4)^(+)of 37.82 mg/L,NH_(3)of 29.83 mg/L,with an NH_(3)/NH_(4)^(+)ratio of 78.78%,confirming the determining influence of pH and temperature on the effectiveness of ammonia stripping.In conclusion,the analysis of the treatment performance of the Sonfonia sludge treatment plant highlights the relevance and robustness of the Azov and Goldman model,combined with the Heins-Coll model,for understanding nitrogen stripping mechanisms.The results obtained provide a reliable scientific basis for the optimization and design of new sludge treatment plants adapted to tropical climatic conditions.展开更多
This study analyzes the causes and effects of climate change in the upper Niger River basin and the implementation of local adaptation strategies based on EMS(Environmental Management Systems).It aims to strengthen ec...This study analyzes the causes and effects of climate change in the upper Niger River basin and the implementation of local adaptation strategies based on EMS(Environmental Management Systems).It aims to strengthen ecological resilience and sustainable natural resource management practices through training,awareness-raising,and community participation.The work was conducted in three rural communes in the Kissidougou prefecture,located in the Faranah administrative region.Data collection and analysis tools included questionnaires,GPS devices,digital devices,laptops,and Excel and SPSS software.The methodology employed a participatory and multidisciplinary approach combining a literature review,surveys of 163 respondents,semi-structured interviews with 16 key informants,training for 218 technical staff and local elected officials(30%of whom were women),and awareness-raising activities for 1,800 participants in local languages.Five community forests covering 443.58 hectares were integrated into management plans,concerted,under the coordination of the NGO APARFE.The results show an increase in average temperature(+0.8°C since 1960),a decrease in rainfall(-5.3 mm/month),and increased vulnerability of populations dependent on agriculture.The integration of the EMS(Environmental Management System)has led to improvements in environmental governance,community forest management,awareness of sustainable agricultural practices,and the inclusion of women(51%of participants).In short,the EMS is an effective tool for strengthening community resilience and environmental sustainability.展开更多
Background: Despite persistent efforts to improve maternal health through various interventions, Guinea faces challenges in achieving adequate antenatal care coverage (ANC). This study aims to identify the key factors...Background: Despite persistent efforts to improve maternal health through various interventions, Guinea faces challenges in achieving adequate antenatal care coverage (ANC). This study aims to identify the key factors influencing prenatal consultation in Guinea. Methods: A secondary analysis was conducted on Guinea’s 2018 Demographic and Health Survey (DHS) data. The study sample comprised women aged 15 - 49 who participated in the survey. Logistic regression was employed to identify the determinants of ANC utilisation. Results: Most women in the sample (59.1%) were aged between 18 and 30, resided in rural areas (69.8%), had no formal education (71.0%), had low incomes (43.4%), were married (91.4%), relied on the radio for information (63.4%), and were employed at the time of the survey (68.0%). The study identified several factors acting as barriers to meeting the recommended four ANC visits, including low education levels, with odds ratios (OR) of 0.43 (p = 0.011) for those with no schooling and 0.48 (p = 0.046) for those with primary-level education. Lack of radio access also negatively influenced ANC utilisation with an OR of 0.72 (p = 0.012). Additionally, delayed timing of the first ANC visit in the second trimester had an OR of 0.36 (p 0.001), while in the third trimester, the OR was 0.04 (p 0.004). On the other hand, factors that facilitated achieving the recommended four ANC visits included having an average wealth quintile with an OR of 1.63 (p = 0.002) and being wealthy with an OR of 2.30 (p 0.001). Conclusion: This study underscores the negative association between low education level and poverty with ANC utilisation among pregnant women in Guinea. These findings emphasise the need for targeted interventions to address the barriers faced by vulnerable populations and improve maternal healthcare access and utilisation in the country.展开更多
文摘This study focuses on the evaluation of the ammonia(NH_(3))stripping and the sizing of a sludge treatment plant,based on experimental results obtained at the station Sonfonia(Conakry,Guinea),based on the Heins-Coll model.The targeted physicochemical parameters are temperature,the pH and nitrogenous forms NH_(3)/NH_(4)^(+).The nitrogen stripping process is described using the Azov and Goldman mathematical model,which allows for the estimation of the concentration of stripped ammonia nitrogen(N-NH_(3))as a function of temperature and pH.The methodology is based on sampling the liquid fraction at different levels of the station,followed by physicochemical analyses and a comparative interpretation of the results.The average results obtained for the period 2022-2023 at the plant inlet are as follows:temperature of 29.71℃,pH of 7.74,and NH_(3)concentration of 28.76 mg/L.These values show that the ammonia load of the incoming sludge is significantly lower than that considered in the initial design of the plant(142 mg/L).Monitoring the flow of the effluent through the four lagoons reveals a progressive decrease in concentrations,with average values of 29.66℃ and pH of 7.66.And NH_(3)of 16.91 mg/L,reflecting a significant purification performance of the lagoon system.Nitrogen stripping tests were conducted in 2023 at Lagoon 1,based on six observation points.The application of the Azov and Goldman model yielded the following results:temperature of 32.15℃,pH of 9.62,NH_(4)^(+)of 37.82 mg/L,NH_(3)of 29.83 mg/L,with an NH_(3)/NH_(4)^(+)ratio of 78.78%,confirming the determining influence of pH and temperature on the effectiveness of ammonia stripping.In conclusion,the analysis of the treatment performance of the Sonfonia sludge treatment plant highlights the relevance and robustness of the Azov and Goldman model,combined with the Heins-Coll model,for understanding nitrogen stripping mechanisms.The results obtained provide a reliable scientific basis for the optimization and design of new sludge treatment plants adapted to tropical climatic conditions.
文摘This study analyzes the causes and effects of climate change in the upper Niger River basin and the implementation of local adaptation strategies based on EMS(Environmental Management Systems).It aims to strengthen ecological resilience and sustainable natural resource management practices through training,awareness-raising,and community participation.The work was conducted in three rural communes in the Kissidougou prefecture,located in the Faranah administrative region.Data collection and analysis tools included questionnaires,GPS devices,digital devices,laptops,and Excel and SPSS software.The methodology employed a participatory and multidisciplinary approach combining a literature review,surveys of 163 respondents,semi-structured interviews with 16 key informants,training for 218 technical staff and local elected officials(30%of whom were women),and awareness-raising activities for 1,800 participants in local languages.Five community forests covering 443.58 hectares were integrated into management plans,concerted,under the coordination of the NGO APARFE.The results show an increase in average temperature(+0.8°C since 1960),a decrease in rainfall(-5.3 mm/month),and increased vulnerability of populations dependent on agriculture.The integration of the EMS(Environmental Management System)has led to improvements in environmental governance,community forest management,awareness of sustainable agricultural practices,and the inclusion of women(51%of participants).In short,the EMS is an effective tool for strengthening community resilience and environmental sustainability.
文摘Background: Despite persistent efforts to improve maternal health through various interventions, Guinea faces challenges in achieving adequate antenatal care coverage (ANC). This study aims to identify the key factors influencing prenatal consultation in Guinea. Methods: A secondary analysis was conducted on Guinea’s 2018 Demographic and Health Survey (DHS) data. The study sample comprised women aged 15 - 49 who participated in the survey. Logistic regression was employed to identify the determinants of ANC utilisation. Results: Most women in the sample (59.1%) were aged between 18 and 30, resided in rural areas (69.8%), had no formal education (71.0%), had low incomes (43.4%), were married (91.4%), relied on the radio for information (63.4%), and were employed at the time of the survey (68.0%). The study identified several factors acting as barriers to meeting the recommended four ANC visits, including low education levels, with odds ratios (OR) of 0.43 (p = 0.011) for those with no schooling and 0.48 (p = 0.046) for those with primary-level education. Lack of radio access also negatively influenced ANC utilisation with an OR of 0.72 (p = 0.012). Additionally, delayed timing of the first ANC visit in the second trimester had an OR of 0.36 (p 0.001), while in the third trimester, the OR was 0.04 (p 0.004). On the other hand, factors that facilitated achieving the recommended four ANC visits included having an average wealth quintile with an OR of 1.63 (p = 0.002) and being wealthy with an OR of 2.30 (p 0.001). Conclusion: This study underscores the negative association between low education level and poverty with ANC utilisation among pregnant women in Guinea. These findings emphasise the need for targeted interventions to address the barriers faced by vulnerable populations and improve maternal healthcare access and utilisation in the country.
