Review of processes controlling arsenic retention and release in soils and sediments of Bengal basin and suitable iron based technologies for its removal

Banerji, Tuhin; Kalawapudi, Komal; Salana, Sudheer; Vijay, Ritesh

doi:10.1016/j.gsd.2018.11.012

Cited by 44 publications

(18 citation statements)

References 159 publications

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“…During the 1990s, Fe 0 has been rediscovered and successfully applied for environmental remediation, including in subsurface permeable reactive barriers (Fe 0 PRBs) [10][11][12][13][14][15][16][17][18]. New Fe 0 -based technologies for safe drinking water supply were then derived from the Fe 0 -based PRB technology [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Operating Mode of Fe0/Fe-Sulfide/H2O Systems for Water Treatment

Xiao

Cui

et al. 2020

Processes

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The general suitability of water treatment systems involving metallic iron (Fe0) is well-established. Various attempts have been made to improve the efficiency of conventional Fe0 systems. One promising approach combines granular Fe0 and an iron sulfide mineral to form Fe0/Fe-sulfide/H2O systems. An improved understanding of the fundamental principles by which such systems operate is still needed. Through a systematic analysis of possible reactions and the probability of their occurrence, this study establishes that sulfide minerals primarily sustain iron corrosion by lowering the pH of the system. Thus, chemical reduction mediated by FeII species (indirect reduction) is a plausible explanation for the documented reductive transformations. Such a mechanism is consistent with the nature and distribution of reported reaction products. While considering the mass balance of iron, it appears that lowering the pH value increases Fe0 dissolution, and thus subsequent precipitation of hydroxides. This precipitation reaction is coupled with the occlusion of contaminants (co-precipitation or irreversible adsorption). The extent to which individual sulfides impact the efficiency of the tested systems depends on their intrinsic reactivities and the operational conditions (e.g., sulfide dosage, particle size, experimental duration). Future research directions, including the extension of Fe0/Fe-sulfide/H2O systems to drinking water filters and (domestic) wastewater treatment using the multi-soil-layering method are highlighted.

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Section: Introductionmentioning

confidence: 99%

Understanding the Operating Mode of Fe0/Fe-Sulfide/H2O Systems for Water Treatment

Xiao

Cui

et al. 2020

Processes

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“…Several Fe 0 -based clean water technologies are available for rural households in the developing world, and particularly Asia. Most of them have been designed in the framework of arsenic removal [116][117][118][119][120][121][122][123][124][125][126][127][128]. Water can be made available to a whole village, or alternatively, individual families may use household filters.…”

Section: Performance Of Available Fe 0 /H 2 O Systemsmentioning

confidence: 99%

“…The IITB filter was conceptualized using the knowledge that multiple additions of Fe(II) to slow sand filters improve their removal capacity for arsenic [16,[118][119][120][121][124][125][126][127][128]. As is adsorbed onto FeCPs, generally termed as hydrous ferric oxide (HFO) [125,129]. The system was designed and built by Tuhin Banerji, a PhD student under the supervision of Professor Sanjeev Chaudhari from IIT Bombay [5].…”

Section: Operating Principles and Limitationsmentioning

confidence: 99%

Fe0/H2O Filtration Systems for Decentralized Safe Drinking Water: Where to from Here?

Nanseu‐Njiki

Gwenzi

Pengou

et al. 2019

Water

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Inadequate access to safe drinking water is one of the most pervasive problems currently afflicting the developing world. Scientists and engineers are called to present affordable but efficient solutions, particularly applicable to small communities. Filtration systems based on metallic iron (Fe0) are discussed in the literature as one such viable solution, whether as a stand-alone system or as a complement to slow sand filters (SSFs). Fe0 filters can also be improved by incorporating biochar to form Fe0-biochar filtration systems with potentially higher contaminant removal efficiencies than those based on Fe0 or biochar alone. These three low-cost and chemical-free systems (Fe0, biochar, SSFs) have the potential to provide universal access to safe drinking water. However, a well-structured systematic research is needed to design robust and efficient water treatment systems based on these affordable filter materials. This communication highlights the technology being developed to use Fe0-based systems for decentralized safe drinking water provision. Future research directions for the design of the next generation Fe0-based systems are highlighted. It is shown that Fe0 enhances the efficiency of SSFs, while biochar has the potential to alleviate the loss of porosity and uncertainties arising from the non-linear kinetics of iron corrosion. Fe0-based systems are an affordable and applicable technology for small communities in low-income countries, which could contribute to attaining self-reliance in clean water supply and universal public health.

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“…The recycling of dredged sediments in beneficial uses could be a promising route compared to the traditional disposal methods (Baxter et al, 2004). The recovery of valuables, like sediments as secondary raw materials, may contribute towards achieving sustainable circular economies.…”

Section: Introductionmentioning

confidence: 99%

Characterization of dredged sediments: a first guide to define potentially valuable compounds – the case of Malmfjärden Bay, Sweden

et al. 2019

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Abstract. Millions of tons of bottom sediments are dredged annually all over the world. Ports and bays need to extract the sediments to guarantee the navigation levels or remediate the aquatic ecosystem. The removed material is commonly disposed of in open oceans or landfills. These disposal methods are not in line with circular-economy goals and additionally are unsuitable due to their legal and environmental compatibility. Recovery of valuables represents a way to eliminate dumping and contributes towards the sustainable extraction of secondary raw materials. Nevertheless, the recovery varies on a case-by-case basis and depends on the sediment components. Therefore, the first step is to analyse and identify the sediment composition and properties. Malmfjärden is a shallow semi-enclosed bay located in Kalmar, Sweden. Dredging of sediments is required to recuperate the water level. This study focuses on characterizing the sediments, pore water and surface water from the bay to uncover possible sediment recovery paths and define the baseline of contamination in the water body. The results showed that the bay had high amounts of nitrogen (170–450 µg L−1), leading to eutrophication problems. The sediments mainly comprised small size particle material (silt, clay and sand proportions of 62 %–79 %, 14 %–20 %, 7 %–17 %, respectively) and had a medium–high level of nitrogen (7400–11 000 mg kg−1). Additionally, the sediments had little presence of organic pollutants and low–medium concentration of metals or metalloids. The characterization of the sediments displays a potential use in less sensitive lands such as in industrial and commercial areas where the sediments can be employed as construction material or as plant-growing substrate (for ornamental gardens or vegetation beside roads).

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Review of processes controlling arsenic retention and release in soils and sediments of Bengal basin and suitable iron based technologies for its removal

Cited by 44 publications

References 159 publications

Understanding the Operating Mode of Fe0/Fe-Sulfide/H2O Systems for Water Treatment

Understanding the Operating Mode of Fe0/Fe-Sulfide/H2O Systems for Water Treatment

Fe0/H2O Filtration Systems for Decentralized Safe Drinking Water: Where to from Here?

Characterization of dredged sediments: a first guide to define potentially valuable compounds – the case of Malmfjärden Bay, Sweden

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