Arsenic Contamination in Groundwater and Its Removal Strategies with Special Emphasis on Nano Zerovalent Iron

Thakur, Shivani; Singh, Harminder; Chaudhari, Umakant; Mittal, Sunil; Sahoo, Prafulla Kumar

doi:10.1002/9781119870562.ch6

Cited by 4 publications

(2 citation statements)

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“…According to the previous literatures, numerous analytical techniques have been employed such as chemical precipitation, biological processing, ion exchange, adsorption, and more for arsenic removal. Adsorption is one of the most alluring methods among them due to the advantages of ease of use, low operating costs, and efficient removal without the production of toxic byproducts [3].…”

Section: Introductionmentioning

confidence: 99%

“…In previous years, a lot of work has been carried out using different types of adsorbents for arsenic or other heavy metals removal. Thakur et al, 2023 studied the effectiveness of different iron based adsorption materials for perfect removal of arsenic from waste water [3]. Xiong et al, investigated the performance of iron oxyhydroxide for chromium (III) removal from acidic solution using batch technique at various reaction time, pH, and adsorbent dose [18].…”

Section: Introductionmentioning

confidence: 99%

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Modified paddy husk carbon with linked fibrils of FeHO₂ using aluminium as surface regulator for enhanced As (III) removal in fixed bed system

Ahmad¹,

Gautam²,

Sawood³

et al. 2023

Preprint

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The As (III) uptake capacity of Fe impregnated AC greatly depends on availability of active surface sites of Iron Oxide, which is determined by the surface area of the anchoring particles. In this context, utilizing Al as a surface regulator, we proposed a process to attach linked fibrils of FeHO₂ with the objective of developing an adsorbent with enhanced As (III) adsorption capacity. The procedure was based on hydrothermal process using paddy husk based AC, and both Iron and aluminium ions in the test hydrolysis solution. By a dynamic approach that would enable an industrial-scale treatment, fixed column adsorption tests were conducted to enhance the generation of cleaner effluents and further study the primary mechanisms involved in the adsorption process. CCD was employed to evaluate the interactions between various operating process variables and their effects on the breakthrough time for optimization of As (III) adsorption process. The exhaust time was observed to rise with increasing dose, falling flow rate, and influent concentration. The CCD optimization result showed that the FeAlPBC was an efficient and cost effective adsorbent with a maximum response of 1681 min, when the independent parameters were retained at 15.0 g FeAlPBC dose, 500 µg/L influent concentrations, 2.0 mL/min flow rate, and a desirability value of 0.986. To further comprehend the primary adsorption mechanisms, the breakthrough curves were predicted by application of the test data in the Thomas, Adam-Bohart, Yoone-Nelson, and Advection diffusion models. The experimental results and Thomas and Advection diffusion models were in good agreement. 0.1 M NaOH solution was used to regenerate the columns. The FeAlPBC samples can be recycled upto four cycles with little to no reduction in adsorption capacity. Also, the TCLP test demonstrated that the used FeAlPBC were inert and could be put into landfills without risk. In conclusion, FeAlPBC is a strong contender for removing As (III) from potable water and has a wide range of potential future applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%