Arsenic Removal from Ground Water by Sand Filtration during Biological Iron Oxidation

Shafiquzzaman, Md.; Mishima, Iori; Nakajima, Jun

doi:10.2521/jswtb.44.11

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…Therefore, the removal of As(III) in the column was occurred mainly due to the simultaneous oxidation of As(III) and Fe(II) and their subsequent adsorption. This mechanism was explained in our previous study 27) .…”

Section: Hybrid 1 Filtration Methods For As(iii) Removalsupporting

confidence: 52%

“…In our study, synthetic groundwater contained 1.0 mg/l phosphorus and in the single column MC the Fe released inhibited by phosphorus. On the contrary, P was almost removed by the BC of Hybrid 1 27) and did not effect the MC. Therefore, Fe release was higher in Hybrid 1 MC.…”

Section: Hybrid 1 Filtration Methods For As(iii) Removalmentioning

confidence: 81%

“…and Leptothrix ochracea [23][24][25][26] . In our previous study 27) , As removal from synthetic groundwater containing high As and Fe (500 µg/l As(III) and 5 mg/l Fe(II)) was investigated during biological Fe(II) oxidation. Batch studies were conducted to clarify the arsenic removal mechanism during the biological Fe(II) oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Method for Arsenic Removal from Groundwater

Shafiquzzaman

Mishima

Nakajima

2008

Japanese J. Wat. Treat. Biol.

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Hybrid methods for arsenic removal from synthetic groundwater were investigated in this study. Batch study showed that As(III) removal was first-order at high Fe(0) shavings concentration and approached zero-order at low concentration. It was suggested that As(III) was removed by surface precipitation and adsorption processes. A single Fe(0) shavings column experiment was conducted for As(III) removal and the experimental data were evaluated by the Thomas and Yan adsorption models. As(III) removal capacity of Fe(0) shavings estimated by the Thomas model (11.3 mg/g) and Yan models (10.8 mg/g) were closed to the values calculated from the experimental data (10.3 mg/g). Two types of hybrid column filtration methods (Hybrid 1 and Hybrid 2) were conducted to evaluate the processes with regard to the applicability and remedial performance of As(III). Hybrid 1 was bacterial column (BC) filtration followed by Fe(0) shavings column filtration (MC), while Hybrid 2 was MC followed by BC. Results showed that As(III) was removed to less than 10 µg/l in Hybrid 1 but the effluent Fe concentration was higher (> 0.5 mg/l). By contrast, both As and Fe were removed to less than 10 µg/l and 0.3 mg/l, respectively in Hybrid 2. The MC columns data of Hybrid 1 and Hybrid 2 were examined by the Thomas and Yan models. As(III) removal capacity was increased in Hybrid 2 MC due to the presence of Fe(II) in the synthetic groundwater. Accordingly, it was suggested that the hybrid methods would be effective processes to remove As(III) from highly contaminated groundwater.

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Section: Hybrid 1 Filtration Methods For As(iii) Removalsupporting

confidence: 52%

Section: Hybrid 1 Filtration Methods For As(iii) Removalmentioning

confidence: 81%

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Hybrid Method for Arsenic Removal from Groundwater

Shafiquzzaman

Mishima

Nakajima

2008

Japanese J. Wat. Treat. Biol.

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“…It is well known that amorphous Fe(OH) 3 , HFO and Goethite bind both arsenite (As(III)) and arsenate (As(V)) (Manning et al, 1998;Hug and Leupin, 2003). In contrast, the oxidation of As(III) parallel to the biological and/or physico-chemical oxidation of Fe(II) may occur in the reactor and further enhance the overall As removal efficiency Katsoyiannis and Zouboulis, 2004;Leupin and Hug, 2005;Shafiquzzaman et al, 2008). Moreover, the gradual decrease of effluent As concentration in Runs 1 and 2 (Fig.…”

Section: As(iii) Removal Mechanismmentioning

confidence: 99%

“…Arsenic can directly adsorb onto the biological iron oxides. In addition, As(III) oxidation during biological oxidation of dissolved Fe(II) may occur (Katsoyiannis and Zouboulis, 2004;Shafiquzzaman et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Development of a Simple, Effective Ceramic Filter for Arsenic Removal

Shafiquzzaman

Hasan

Nakajima

et al. 2011

J. of Wat. & Envir. Tech.

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A simple, low-cost filtration system composed of a ceramic filter, an iron net and iron bacterial sludge was developed to remove arsenic (As) from groundwater. The ceramic filter, made of an 80% clay soil and 20% rice bran mixture on a weight basis, was combined with the iron net and the iron bacterial sludge in a reactor, and the assembly (As removal filter) was tested for its ability to remove As from synthetic groundwater. Synthetic groundwater with a varying composition of As(III), ferrous iron (Fe(II)) and phosphate phosphorus (P) was filtered on a daily basis. The results showed that both Fe(II) in groundwater and those released from the iron net were oxidized biologically and/or physico-chemically and that As and P were effectively removed by adsorption and/or co-precipitation processes. The concentrations of Fe(II) and P in groundwater were decisive factors in the removal of As . Groundwater Fe concentrations of ≥ 2 mg/L and P concentrations of ≤ 3 mg/L with an Fe/P molar ratio of ≥ 3.0 were required to achieve an effluent As concentration of less than 50 µg/L from raw water containing 500 µg/L of As(III). This simple, inexpensive filter could be used to treat As in contaminated regions.

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Influence of iron, phosphate, and silicate on arsenic removal from groundwater using a low‐cost ceramic filter

Shafiquzzaman,

Haider,

Azam

et al. 2023

Water Environment Research

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The ceramic filter amended with iron (Fe) has proven to be a potential low‐cost method for arsenic (As) removal from groundwater. The presence of Fe, phosphate (P), and silicate (Si) significantly affects the As removal efficiency of the ceramic filter, which has not been passably investigated. The present research aimed to examine the effect of Fe, P, and (or) Si presence as single or in combination on As (III) removal from synthetics groundwater by a low‐cost iron amended ceramic filter (IACF). Laboratory‐scale filtration experiments at different compositions of Fe, P, Si, and As (III) were conducted by the IACF fabricated with a ceramic candle and iron netting box. Fe (II) in synthetic groundwater positively impacted As (III) removal. At a concentration of 2 mg/L of Fe (II), the As levels in the effluent decreased to less than the maximum contamination level (MCL) of 50 μg/L. Groundwater P concentration needed less than 3 mg/L or Si concentrations required less than 35 mg/L to effectively reduce As (III) to below the MCL at 5mg/L of groundwater Fe (II). The cumulative effect of P and Si on As removal was found to be more significant than distinct contributions. The presence of 2 mg/L P and 35 mg/L or higher Si in the groundwater cumulatively reduced the As removal performance from 92% to 63%, and the MCL was not met. The negative impact of P and Si on As (III) removal followed the order of (P + Si) > P > Si. P competed with As for adsorption sites during the process, while Si inhibited the Fe release and floc formation, significantly reducing As removal performance. The study findings can potentially contribute to optimizing IACF as a low‐cost method for As removal from groundwater.

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Arsenic Removal from Ground Water by Sand Filtration during Biological Iron Oxidation

Cited by 12 publications

References 18 publications

Hybrid Method for Arsenic Removal from Groundwater

Hybrid Method for Arsenic Removal from Groundwater

Development of a Simple, Effective Ceramic Filter for Arsenic Removal

Influence of iron, phosphate, and silicate on arsenic removal from groundwater using a low‐cost ceramic filter

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