Removal of uranium from aqueous solutions by diatomite (Kieselguhr)

“…Diatomite has been utilized as a filtration medium for adsorption of both inorganic and organic chemicals because of its specific attributes, namely its low density, highly porous structure and high surface area. The natural and modified structures of diatomite have attracted the attention of researchers as an adsorbent for heavy metals and uranium [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have investigated the efficiency of zeolite, diatomite, and bentonite in removing metal ions from wastewater [22,23,26,27,29]. However, no applied studies have been conducted so far investigating and comparing pilot-scale bed columns made from the above-mentioned materials for removal of metals from drainage effluent at CLEQM.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Natural Clay Mineral Adsorbent Filtration Systems in Wastewater Treatment for Potential Irrigation Purposes

et al. 2021

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This project investigated the relative efficiencies of three pilot-scale constructed columns for enhancing drainage wastewater treatment processes to ensure compliance with Egyptian and international water quality criteria. In this investigation, basic materials (sand and gravel) and variable natural clay minerals zeolite (Z), diatomite (D) and bentonite (B) were utilized as packing materials to build up a Z column (ZC), D column (DC) and B column (BC), respectively. The three columns’ ability to remove pollutants from waste water for re-use in irrigation was investigated throughout one year (12 trials). The results revealed that the influent water had 211 mg/L total suspended solids, 6.09 mg/L total nitrogen, 36.67 mg/L biochemical oxygen demand, 56 mg/L chemical oxygen demand, 1700 mg/L total dissolved solids, 0.97 mg/L copper (Cu2+), 1.12 mg/L iron (Fe2+), 1.07 mg/L manganese (Mn2+), 1.02 mg/L lead (Pb2+), 1.05 mg/L zinc (Zn2+), and 46 × 103 CFU/mL fecal coliforms. These parameters were higher than the values permitted by Egyptian and international licenses. The range of removal efficiency of these pollutants by ZC was 96–21%, by BC was 99–29.8%, and by DC was 99–19.80%. Regeneration studies for the spent adsorbents demonstrated that the percentages of pollutant removal were sufficiently high. The treated effluent produced by the three columns was suitable for irrigation purposes, especially at a contact time of four hours, with the order for column treatment efficiency being BC ˃ DC ˃ ZC. Treated water was classified for irrigation suitability according to the Agrifood Water Quality Index (AFWQI) as marginal from the ZC, very good from the DC, and excellent from the BC. Treatment of such drainage water using the BC and DC appears feasible, because the process is easily operated and leads to final treated effluent of high quality for agricultural uses. The economic cost also confirms the feasibility of this treatment.

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“…Clean uranium polluted water remains a challenge, in which, most of the efforts focus on uranyl ion adsorbents, which need to be effective in uranium removal as well as environmental friendly. Natural absorbents such as clays and minerals have been the subjects of many U(VI) adsorption studies [6][7][8][9][10] . Recently, a class of synthetic clay known as the magnesium aluminum hydroxide hydrate layered double hydroxides, or hydrotalcite-like compound, has been demonstrated as a potential adsorbent because of its high adsorption capacity with cationic and anionic species [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of U(VI) from Aqueous Solution onto Hydrotalcite‐Like Compounds

Suc¹

2011

Journal of Chemistry

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Uranium adsorption by the synthesized compound of magnesium aluminum hydroxide hydrate – layered double hydrotalcite (STH)-like compounds was studied. The calcinated STH was proven to be a highly effective in U(VI) adsorption in pH range from 6.5 to 7. The time dependent experimental data were found to be fit to the pseudo-second-oder model. The equilibrium data have been modeled using Langmuir and Freundlich isotherms. The results showed that both model provide the best correlation with equilibrium data. The highest adsorption capacity, approximated 62.5 mg/g, was observed in the calcinated STH at 500 °C. The positive value of enthalpy change indicated that adsorption reaction of U(VI) on STH was endothermic process. The regeneration experiments of STH using 0.1M Na2CO3solution was successfully demonstrated multiple times without any significant effect on the initial adsorption capacity.

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Removal of uranium from aqueous solutions by diatomite (Kieselguhr)

Cited by 58 publications

References 11 publications

On the retention of uranyl and thorium ions from radioactive solution on peat moss

On the retention of uranyl and thorium ions from radioactive solution on peat moss

Efficiency of Natural Clay Mineral Adsorbent Filtration Systems in Wastewater Treatment for Potential Irrigation Purposes

Adsorption of U(VI) from Aqueous Solution onto Hydrotalcite‐Like Compounds

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