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231223s2009 xx |||||o 00| ||eng c |
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|a 10.2166/wst.2009.543
|2 doi
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|a pubmed25n0640.xml
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|a eng
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|a Singhakant, C
|e verfasserin
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|a Fractional analysis of arsenic in subsurface-flow constructed wetlands with different length to depth ratios
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|c 2009
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 17.12.2009
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|a Date Revised 21.11.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a Arsenic (As) removal in subsurface-flow constructed wetlands (CW) planting with vetiver grasses was experimented by comparing between two different configurations; (i) deep-bed units (dpCW) with length to depth (L:D) ratio=2 and (ii) shallow-bed units (shCW) with L:D ratio=8; operating at hydraulic retention time (HRT) of 6, 9, and 12 days. The tracer study of CW units revealed that no effect of L:D ratio on dispersion number could be determined, but affecting to the effective volume ratio. Based on the data obtained from the pilot-scale experiments of CW units for 117 days, it is apparent that the dpCW could achieve relatively high As removals (52.9%, 59.2%, and 72.1% at HRT of 6, 9, and 12 days, respectively). Analysis of As mass balance showed that only 0.2-0.4% of As input was uptaken by vetiver grasses whereas the major portion was retained in the CW media (38.9-77.6%). Forms of the retained As was determined by sequential fractionation which could indicate As complexation with iron and manganese on the media surface of 31-38% and As trapping into the media of 42-52% of the total. No obvious difference of As fractions in bed of between dpCW and shCW units was observable
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|a Journal Article
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|a Water Pollutants, Chemical
|2 NLM
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|a Arsenic
|2 NLM
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|a N712M78A8G
|2 NLM
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|a Koottatep, T
|e verfasserin
|4 aut
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|a Satayavivad, J
|e verfasserin
|4 aut
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|i Enthalten in
|t Water science and technology : a journal of the International Association on Water Pollution Research
|d 1986
|g 60(2009), 7 vom: 21., Seite 1771-8
|w (DE-627)NLM098149431
|x 0273-1223
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|g volume:60
|g year:2009
|g number:7
|g day:21
|g pages:1771-8
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|u http://dx.doi.org/10.2166/wst.2009.543
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