Appraisal of a simple arsenic removal method for ground water of Bangladesh

Khan, Avik; Rasul, Shahriar Bin; Munir, A. K. M.; Habibuddowla, M.; Alauddin, Mohammad; Newaz, S.S.; Hussam, Abul

doi:10.1080/10934520009377018

Cited by 129 publications

(102 citation statements)

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“…This work also complements our ongoing efforts to develop inexpensive methods for the purification of water from arsenic. [16,17] In Bangladesh, it is commonly known that groundwater high in iron when left in the open forms a brownish precipitate and removes some inorganic species. The water, locally known as 'bashi pani,' is then collected by decanting.…”

Section: Introductionmentioning

confidence: 99%

“…It shows that arsenic in groundwater can be removed much below the MCL by a simple 3-Kolshi filtration procedure using locally available material and without adding chemicals. [16,17] The overall water quality obtained from the 3-Kolshi setup meets the guideline values suggested by USEPA, World Health Organization and Bangladesh. Although the NAGW barely meets the water quality for arsenic, one could use the technique to reduce the initial concentration of arsenic and then use other techniques to enhance the efficiency and lifetime of the process.…”

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confidence: 99%

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Chemical Fate of Arsenic and Other Metals in Groundwater of Bangladesh: Experimental Measurement and Chemical Equilibrium Model

Hussam

Habibuddowla²,

Alauddin

et al. 2003

Journal of Environmental Science and Health, Part A

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The presence of toxic level of inorganic arsenic in groundwater used for drinking in Bangladesh and neighboring India is unfolding as one of the worst natural disaster in the region. The purpose of this work is to ascertain the chemical fate of arsenic and other metals in groundwater of Bangladesh. A combination of techniques was used to measure 24 metals, 6 anions, E h , pH, dissolved oxygen, conductivity, and temperature to understand the distribution of components which were then used in computational chemical equilibrium model, MINEQLþ, for detailed speciation. It was found that the fate of arsenic and its speciation were inextricably linked to the formation of hydrous ferric oxide (HFO) and its kinetic. The HFO induced natural attenuation removes 50-75% of total arsenic in first 24 h through a first order kinetics. Adsorption on HFO is the predominant mode of removal of arsenic, MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK, NY 10016iron, manganese, and most trace metals. The equilibrium model points to the presence of excess active sites for the removal of arsenic. MINEQLþ shows that significantly higher concentration of HFO forming iron is required to remove arsenic below maximum contamination level (MCL) of 50 mg/L than predicted by stoichiometry. The practical implication of this work is the prediction of water quality based on models.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Chemical Fate of Arsenic and Other Metals in Groundwater of Bangladesh: Experimental Measurement and Chemical Equilibrium Model

Hussam

Habibuddowla²,

Alauddin

et al. 2003

Journal of Environmental Science and Health, Part A

Self Cite

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“…In fact, very efficient Fe [31][32][33][34] but were abandoned because of service lives of only 6 to 24 weeks [35][36][37]. Hussam [37] reported that 3-Kolshi filters were "highly functional, but not sustainable" as the filters experienced permeability loss after 3 to 6 months.…”

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confidence: 99%

Enhancing sustainability of household water filters by mixing metallic iron with porous materials

Noubactep¹,

Caré

2010

Chemical Engineering Journal

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“…The remarkable efficiency of 3-Kolsi filters has prompted researchers to further develop the system for improved sustainability [9,10,31,[34][35][36][37]. The best product is the SONO arsenic filter in which the 100 % Fe 0 layer is replaced by a proprietary porous Fe 0 -based material (termed as Composite Iron Material -CIM) [32,33].…”

Section: Metallic Iron For Household Filtersmentioning

confidence: 99%

Dimensioning metallic iron beds for efficient contaminant removal

Noubactep¹,

Caré

2010

Chemical Engineering Journal

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Remediation of contaminated groundwater is an expensive and lengthy process. (ii) used Fe 0 amounts must represent 30 to 60 vol-% of the mixture, and (iii) Fe 0 beds are deep-bed filtration systems. The major output of this study is that thicker barriers are needed for long service life. Fe 0 filters for save drinking water production should use several filters in series to achieve the treatment goal. In all cases proper material selection is an essential issue. [5][6][7][8], and (ii) as reagents to assist biofiltration in household filters [3,9,10]. The fundamental process responsible for contaminant removal in both contexts is necessarily the oxidative dissolution of Fe 0 (iron corrosion) which may be coupled with contaminant reduction (reactive walls) or the subsequent precipitation of iron hydroxides which may be coupled with contaminant adsorption and co-precipitation (household filters).Adsorption, co-precipitation and chemical transformations (oxidation and/or reduction) are not mutually exclusive [11][12][13]. It is obvious that in household filters and reactive walls, a synergy between these three processes is responsible for expected and observed decontamination. Moreover, these processes proceed in the inter-granular porosity of the packed beds which are made up of Fe 0 (100 %) or a mixture of Fe 0 and an inert material (e.g. gravel, pumice, sand) [2,14]. Because of the volumetric expansive nature of the process of iron corrosion [15], the porosity of the filtrating systems certainly decreases with increasing service life, possibly yielding complete permeability loss system (filter clogging) [16,17]. The filling of the pore volume by corrosion products is necessarily coupled with improved size exclusion capacity. Therefore, a fourth mechanism for decontamination in packed Fe 0 beds is The concept that contaminants are fundamentally removed by adsorption and co-precipitation is consistent with many experimental observations which remained non-elucidated by the reductive transformation concept [11,12]. Although researchers are continuing to maintain the validity of the latter concept [24][25][26], the new concept was validated [27,28] and has been independently verified [29,30]. As a matter of course the concept of adsorption/co- Metallic iron for household filtersWhile using slow sand filtration for water treatment in rural Bangladesh, it was observed that the filter efficiency for arsenic removal depends on the iron content of natural waters. Arsenic was readily removed from Fe-rich natural waters. Accordingly, Fe 0 is used "to provide a constant input of iron (soluble or surface precipitate) for groundwater low in soluble iron"[32]. The very efficient resulting filter for As removal was the 3-Kolsi filter [10,33]. A typical 3-Kolsi filter contained a layer of about 3 kg Fe 0 (100 % Fe 0 ). However, the 3-Kolsi filter was not sustainable as it clogged after some 8 weeks of operation [3,34].The remarkable efficiency of 3-Kolsi filters has prompted researchers to further develop the system fo...

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Appraisal of a simple arsenic removal method for ground water of Bangladesh

Cited by 129 publications

References 30 publications

Chemical Fate of Arsenic and Other Metals in Groundwater of Bangladesh: Experimental Measurement and Chemical Equilibrium Model

Chemical Fate of Arsenic and Other Metals in Groundwater of Bangladesh: Experimental Measurement and Chemical Equilibrium Model

Enhancing sustainability of household water filters by mixing metallic iron with porous materials

Dimensioning metallic iron beds for efficient contaminant removal

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