Browsing by Author "Mureth, Risala"

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Assessment of fluoride removal in a batch electro‒coagulation process
(NM-AIST, 2021-06) Mureth, Risala
A presence of excessive amounts of fluoride than the prescribed standards has been reported in sources of domestic water supply around mount Meru slopes and other parts in Tanzania while efforts to remove the excessive fluoride was carried out using various technologies and materials. This study was perfomed to understand the fluoride removal effeciency of the electrocoagulation technique. It has been reported that in the electrocoagulation process, ions removal efficiency depends on the electrolysis time, voltage, pH and initial ions concentration applied. In this electrocoagulation process, experiments were carried out to examine its efficiency on removal of fluoride ions. The fluoride concentration tested ranged from 1.37 to 48 mg/L in both synthetic and natural waters. The voltage applied for the electrocoagulation process ranged from 0 to 50 V while maintaining an optimal pH of 4 to 9. Experimental results showed the removal efficiency of 90% with an optimal time of 30 minutes, at an applied voltage of 20 V and a pH of 6 at initial concentration of 29.5 mg/L at 300 ml. The method showed efficient removal of fluoride in water to achieve the allowable limits by the World Health Organization and Tanzania Bureau of Standards (1.5 mg/L). At this voltage (30 V), the process could be inferred to have the capability of treating the water and hence rendering such water safe for use as reported previously.
Assessment of fluoride removal in a batch electrocoagulation process: A case study in the Mount Meru Enclave
(Elsevier B.V., 2021-03-04) Mureth, Risala; Machunda, Revocatus; Njau, Karoli; Dodoo-Arhin, David
The presence of excessive amounts of fluoride than prescribed standards has been reported in various sources of domestic water supply around the slopes of Mount Meru and other parts in Tanzania. Efforts to remove the excessive fluoride have been carried out using various technologies. In this study, electrocoagulation experiments were carried out to assess its efficiency on fluoride removal. The fluoride concentration tested ranged from 1.37 to 48 mg/L in both synthetic and natural waters. The voltage applied in the electrocoagulation (EC) process ranged from 0 to 50 V while maintaining pH values of 4 to 9. The representative experimental results for the Ngarenanyuki river water with initial fluoride concentration of 29.5 mg/L accomplished a removal efficiency of 90% at an optimal electrolysis time of 30 min, an applied voltage of 30 V and an optimal pH of 6. The method showed efficient fluoride removal in water to allowable limits by World Health Organization (WHO) and Tanzania Bureau of Standards (TBS) (1.5 mg/L). Despite the voltage applied (30 V), the pH at neutrality remained unchanged thus making the process more efficient. At this voltage (30 V) the process has been reported previously also to have the capability of disinfecting the water and hence rendering such water safe for use
Assessment of fluoride removal in a batch electrocoagulation process: A case study in the Mount Meru Enclave.
(Elseiver, 2021-03-01) Mureth, Risala; Machunda, Revocatus; Njau, Karoli; Arhin, David
The presence of excessive amounts of fluoride than prescribed standards has been reported in various sources of domestic water supply around the slopes of Mount Meru and other parts in Tanzania. Efforts to remove the excessive fluoride have been carried out using various technologies. In this study, electrocoagulation experiments were carried out to as- sess its efficiency on fluoride removal. The fluoride concentration tested ranged from 1.37 to 48 mg/L in both synthetic and natural waters. The voltage applied in the electrocoag- ulation (EC) process ranged from 0 to 50 V while maintaining pH values of 4 to 9. The representative experimental results for the Ngarenanyuki river water with initial fluoride concentration of 29.5 mg/L accomplished a removal efficiency of 90% at an optimal elec- trolysis time of 30 min, an applied voltage of 30 V and an optimal pH of 6. The method showed efficient fluoride removal in water to allowable limits by World Health Organiza- tion (WHO) and Tanzania Bureau of Standards (TBS) (1.5 mg/L). Despite the voltage applied (30 V), the pH at neutrality remained unchanged thus making the process more efficient. At this voltage (30 V) the process has been reported previously also to have the capability of disinfecting the water and hence rendering such water safe for use.