lydie allali - Academia.edu (original) (raw)
Papers by lydie allali
International Journal of Biological and Chemical Sciences, 2022
Lack of access to safe drinking water is an issue in some areas where centralized water treatment... more Lack of access to safe drinking water is an issue in some areas where centralized water treatment is not possible, the biosand filter (BSF) one of several such point-of-use technologies is available. This study was conducted in Côte d’Ivoire to evaluate the effect of flow rate on the performance of the BSF. Three biosand filter (BSF) built in Poly vinyl chloride was used to investigate the effect of three flow rates (1.95 L/d in BSF1; 3.9 L/d in BSF2 and 7.8 L/d in BSF3) for 91 days. Each BSF was filled with 15 cm of gravel, 90 cm of sand and 40 cm of supernatant water. Physical and chemical parameters were analyzed in raw water and filtered water with standards methods. The results showed that the percentage removal of TSS approximately the same for all filters. Ammonium concentrations ranged from 37 to 170 μg.L-1, 110 to 190 μg.L-1 and 150 to 278 μg.L-1 for filtered waters of BSF1, BSF2 and BSF3, respectively. Nitrite concentrations in filtered waters of BSF1 (2 - 33 μg.L-1) were ...
Journal of environment and earth science, 2018
Calcined sandstone and calcined laterite were tested as adsorbent at a low cost for the removal o... more Calcined sandstone and calcined laterite were tested as adsorbent at a low cost for the removal of arsenic (As) from the drinking water. The natural materials were collected in Cote d'Ivoire, washed and then dried at a temperature of 60 ° C and finally calcined in an oven at the atmospheric air in several temperatures 300 ° C, 400 ° C, 500 ° C, 600 ° C and 700 ° C. The study of adsorption of the arsenic was realized for the various adsorbates. It showed that the biggest efficiency of the elimination was attributed to the calcined sandstone to 300°C and 400°C for laterite during 2h with a percentage that reached 99.4 %. At this calcination temperature, amount of arsenic in treated water, satisfying the World Health Organization (WHO) standard for drinking water at initial arsenic concentrations greater than 5 mg/L. The chemical composition of the obtained adsorbs was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and thermal analysis (TGA-DSC). Adso...
International Journal of Engineering Technologies and Management Research, 2020
The pollution by heavy metal in the environment, particularly groundwater, constitutes an environ... more The pollution by heavy metal in the environment, particularly groundwater, constitutes an environmental problem and health in Côte d’Ivoire. Among methods used for removal heavy metals, adsorption by natural absorbent such as a laterite is effective and cheap when compared to other methods. So, this study evaluates the laterite reactor performance for effective removal of heavy metals viz., arsenic (As), nickel (Ni) and lead (Pb) from real-life groundwater. And adsorption of heavy metals was performed with laterite of different particle sizes, viz. coarse grain size of laterite (LRCOG) and laterite granules (LRG). The results obtained showed that the percentages of removal of heavy metal are higher than the size of the laterite. As, Ni and Pb removal are 98.3 ± 0.4%, 99.2 ± 0.2% and 96.1 ± 1.1% respectively in LRCOG effluents. With the laterite in form of granules, percentage removal were of 98.6 ± 0.3% for As that of the Ni is of 99.7 ± 0.2% and 97.9 ± 0.5 % for Pb. The adsorption ...
International Journal of Innovation and Applied Studies, May 25, 2015
Four biosand filters were used for treatment of Banco river source water to investigate the effec... more Four biosand filters were used for treatment of Banco river source water to investigate the effects of sand depth (30, 50, 70 and 90 cm) on the removal of suspended solids, nitrogen and oxidized forms of the chemical demand oxygen and their effect on the pH. The results showed that the filter of 90 cm of sand was the most efficient. However, the purification yields between filters 50, 70 and 90 cm of sand showed no significant difference, and the treated water met the drinking water standards of the world health organization. Therefore, sand depth between 50 and 90 cm can be used in biosand filter to treat water.
A concrete biosand filter (BSF) was designed, and its performance was evaluated on three differen... more A concrete biosand filter (BSF) was designed, and its performance was evaluated on three different water used in the rural communities. The field study was conducted by using tap, well and pump waters, and a questionnaire was administered to apprehend the community’s attitudes in the BSF utilisation. BSF performance was characterised by analysing the filtrates concentration in NH4+, NO3- , NO2-, COD, Escherichia coli, and Clostridium perfringens. The BSF was approved by 94% of the population for water quality, ease of use and quantity of clean water produced. The main results are effective removal of microorganisms (C. perfringens, E. coli), chemical transformation and removal of NH4+, NO3- and COD at concentrations below WHO drinking water standards. BSF technology could be a solution in the provision of portable water to rural areas and might represent an alternative for the use of expensive bottled water.
International Journal of Biological and Chemical Sciences, 2022
Lack of access to safe drinking water is an issue in some areas where centralized water treatment... more Lack of access to safe drinking water is an issue in some areas where centralized water treatment is not possible, the biosand filter (BSF) one of several such point-of-use technologies is available. This study was conducted in Côte d’Ivoire to evaluate the effect of flow rate on the performance of the BSF. Three biosand filter (BSF) built in Poly vinyl chloride was used to investigate the effect of three flow rates (1.95 L/d in BSF1; 3.9 L/d in BSF2 and 7.8 L/d in BSF3) for 91 days. Each BSF was filled with 15 cm of gravel, 90 cm of sand and 40 cm of supernatant water. Physical and chemical parameters were analyzed in raw water and filtered water with standards methods. The results showed that the percentage removal of TSS approximately the same for all filters. Ammonium concentrations ranged from 37 to 170 μg.L-1, 110 to 190 μg.L-1 and 150 to 278 μg.L-1 for filtered waters of BSF1, BSF2 and BSF3, respectively. Nitrite concentrations in filtered waters of BSF1 (2 - 33 μg.L-1) were ...
Journal of environment and earth science, 2018
Calcined sandstone and calcined laterite were tested as adsorbent at a low cost for the removal o... more Calcined sandstone and calcined laterite were tested as adsorbent at a low cost for the removal of arsenic (As) from the drinking water. The natural materials were collected in Cote d'Ivoire, washed and then dried at a temperature of 60 ° C and finally calcined in an oven at the atmospheric air in several temperatures 300 ° C, 400 ° C, 500 ° C, 600 ° C and 700 ° C. The study of adsorption of the arsenic was realized for the various adsorbates. It showed that the biggest efficiency of the elimination was attributed to the calcined sandstone to 300°C and 400°C for laterite during 2h with a percentage that reached 99.4 %. At this calcination temperature, amount of arsenic in treated water, satisfying the World Health Organization (WHO) standard for drinking water at initial arsenic concentrations greater than 5 mg/L. The chemical composition of the obtained adsorbs was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and thermal analysis (TGA-DSC). Adso...
International Journal of Engineering Technologies and Management Research, 2020
The pollution by heavy metal in the environment, particularly groundwater, constitutes an environ... more The pollution by heavy metal in the environment, particularly groundwater, constitutes an environmental problem and health in Côte d’Ivoire. Among methods used for removal heavy metals, adsorption by natural absorbent such as a laterite is effective and cheap when compared to other methods. So, this study evaluates the laterite reactor performance for effective removal of heavy metals viz., arsenic (As), nickel (Ni) and lead (Pb) from real-life groundwater. And adsorption of heavy metals was performed with laterite of different particle sizes, viz. coarse grain size of laterite (LRCOG) and laterite granules (LRG). The results obtained showed that the percentages of removal of heavy metal are higher than the size of the laterite. As, Ni and Pb removal are 98.3 ± 0.4%, 99.2 ± 0.2% and 96.1 ± 1.1% respectively in LRCOG effluents. With the laterite in form of granules, percentage removal were of 98.6 ± 0.3% for As that of the Ni is of 99.7 ± 0.2% and 97.9 ± 0.5 % for Pb. The adsorption ...
International Journal of Innovation and Applied Studies, May 25, 2015
Four biosand filters were used for treatment of Banco river source water to investigate the effec... more Four biosand filters were used for treatment of Banco river source water to investigate the effects of sand depth (30, 50, 70 and 90 cm) on the removal of suspended solids, nitrogen and oxidized forms of the chemical demand oxygen and their effect on the pH. The results showed that the filter of 90 cm of sand was the most efficient. However, the purification yields between filters 50, 70 and 90 cm of sand showed no significant difference, and the treated water met the drinking water standards of the world health organization. Therefore, sand depth between 50 and 90 cm can be used in biosand filter to treat water.
A concrete biosand filter (BSF) was designed, and its performance was evaluated on three differen... more A concrete biosand filter (BSF) was designed, and its performance was evaluated on three different water used in the rural communities. The field study was conducted by using tap, well and pump waters, and a questionnaire was administered to apprehend the community’s attitudes in the BSF utilisation. BSF performance was characterised by analysing the filtrates concentration in NH4+, NO3- , NO2-, COD, Escherichia coli, and Clostridium perfringens. The BSF was approved by 94% of the population for water quality, ease of use and quantity of clean water produced. The main results are effective removal of microorganisms (C. perfringens, E. coli), chemical transformation and removal of NH4+, NO3- and COD at concentrations below WHO drinking water standards. BSF technology could be a solution in the provision of portable water to rural areas and might represent an alternative for the use of expensive bottled water.