Browsing by Author "Edward, Daniel"

Now showing 1 - 2 of 2

The removal of arsenic from synthetic solution using a sand filter coupled with zero valent iron
(NM-AIST, 2024-07) Edward, Daniel
Contamination of groundwater with arsenic (As) poses a serious risk to public health, demanding the development of effective remediation technology. This study investigated the use of sand filters coupled with of zero-valent iron (ZVI) for removal of arsenic from synthetic solutions as the function of ZVI dosage and contact time. ZVI materials, including iron wool, iron fillings, and iron nails, were investigated and compared for their efficacy in removing As from synthetic solutions. The experiment employed synthetic solutions spiked with As compounds (set to be 1000 µg/L) to simulate contaminated groundwater scenarios. The concentrations of As in the influent and effluent samples were used to calculate the efficiency. The findings indicate that all three forms of ZVI tested exhibited significant As removal capabilities. Iron wool, iron fillings, and iron nails demonstrated varying efficiencies, likely influenced by their surface area, reactivity, and specific surface chemistry. According to the findings, iron wool-containing sand filter was more effective at removing As than iron filings and iron nails. As removal efficiency increased with increase in ZVI dose. The results show that As can effectively be removed from water in the first 48h. The highest removal efficiency was 99.6% and the lowest removal efficiency was 82.7%. These results suggest that ZVI materials could be promising candidates for practical applications in As-contaminated groundwater treatment systems. This study contributes valuable insights into the use of inexpensive and widely available ZVI materials for As remediation, highlighting their potential as sustainable solutions for addressing water quality challenges.
Removal of arsenic in a sand filter coupled with zero valent iron
(Elsevier, 2023-06-22) Edward, Daniel; Karungamye, Petro; Nelson, Grite; Selemani, Juma; Njau, Karoli
Arsenic (As) in wastewater has negative effects on the environment and human health, hence As containing wastes must be handled properly. Given the accessibility of metallic iron, studies investigating into the potential application of zerovalent iron in the removal of arsenic are promising. In this study, the performance of sand filter blended with several kinds of zero valent iron (Fe0), such as iron wool, iron fillings, and iron nails, were compared. These materials were combined in a sand filter column, and the efficiency was calculated using the As concentrations in the influent and effluent samples. Experiments were carried out in order to compare performance as a function of Fe0 dose and contact time. The outcome of this investigation showed that sand filter containing iron wool had a better removal efficiency of arsenic removal than iron filings and iron nails. The results in all columns showed that as dosage was increased, removal efficiency of arsenic increased significantly. In case of contact time the results revealed that arsenic can effectively be removed from water in the first 48 h. The early adsorption response is quick in all columns, but get slower as time goes on. The highest removal efficiency was 99.6% and the lowest removal efficiency was 82.7%.