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Chlorobenzene removal efficiencies and removal processes in a pilot-scale constructed wetland treating contaminated groundwater. / Braeckevelt, M.; Reiche, N.; Trapp, Stefan; Wiessner, A.; Paschke, H.; Kuschk, P.; Kaestner, M.

In: Ecological Engineering, Vol. 37, No. 6, 2011, p. 903-913.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Braeckevelt, M.; Reiche, N.; Trapp, Stefan; Wiessner, A.; Paschke, H.; Kuschk, P.; Kaestner, M. / Chlorobenzene removal efficiencies and removal processes in a pilot-scale constructed wetland treating contaminated groundwater.

In: Ecological Engineering, Vol. 37, No. 6, 2011, p. 903-913.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{5e4776f125e04f2386382373d633b9a6,
title = "Chlorobenzene removal efficiencies and removal processes in a pilot-scale constructed wetland treating contaminated groundwater",
publisher = "Elsevier BV",
author = "M. Braeckevelt and N. Reiche and Stefan Trapp and A. Wiessner and H. Paschke and P. Kuschk and M. Kaestner",
year = "2011",
doi = "10.1016/j.ecoleng.2011.01.014",
volume = "37",
number = "6",
pages = "903--913",
journal = "Ecological Engineering",
issn = "0925-8574",

}

RIS

TY - JOUR

T1 - Chlorobenzene removal efficiencies and removal processes in a pilot-scale constructed wetland treating contaminated groundwater

A1 - Braeckevelt,M.

A1 - Reiche,N.

A1 - Trapp,Stefan

A1 - Wiessner,A.

A1 - Paschke,H.

A1 - Kuschk,P.

A1 - Kaestner,M.

AU - Braeckevelt,M.

AU - Reiche,N.

AU - Trapp,Stefan

AU - Wiessner,A.

AU - Paschke,H.

AU - Kuschk,P.

AU - Kaestner,M.

PB - Elsevier BV

PY - 2011

Y1 - 2011

N2 - Low-chlorinated benzenes (CBs) are widespread groundwater contaminants and often threaten to contaminate surface waters. Constructed wetlands (CWs) in river floodplains are a promising technology for protecting sensitive surface water bodies from the impact of CBs. The efficiency and seasonal variability of monochlorobenzene (MCB), 1,4-dichlorobenzene (1,4-DCB) and 1,2-dichlorobenzene (1,2-DCB) removal, the impact of planting, and gaseous MCB emissions from the filter surface were investigated over the course of 1 year in both a vegetated pilot-scale CW and an unplanted reference plot (UR). Annual mean concentration decreases of MCB and 1,4-DCB were observed; however, annual mean 1,2-DCB removal was seen only in the upper filter layer. Planting (Phragmites australis) had a statistically significant beneficial effect on removal. The CB removal efficiency in the CW generally decreased with depth, and seasonal variations of removal were evident, with less concentration decrease during summer. Load removal efficiencies of 59–65% (262–358mgm−2d−1) for MCB, 59–69% (4.0–5.1mgm−2d−1) for 1,4-DCB and 29–42% (0.6–2.1mgm−2d−1) for 1,2-DCB were observed in June and July. Volatilization of MCB from the filter surface accounted for 2–4% of the total amount removed. Simple cover layers of organic materials on the filter surface were suitable for MCB emission reduction. Model calculations were carried out to estimate the MCB removal potential attributable to microbial degradation, volatilisation, and plant uptake in the CW and UR. Microbial degradation was the dominating process. The observed positive impact of plants on MCB removal was caused by improved oxygen supply (due to root oxygen release into the rhizosphere and enhanced water table fluctuations), and direct plant uptake.

AB - Low-chlorinated benzenes (CBs) are widespread groundwater contaminants and often threaten to contaminate surface waters. Constructed wetlands (CWs) in river floodplains are a promising technology for protecting sensitive surface water bodies from the impact of CBs. The efficiency and seasonal variability of monochlorobenzene (MCB), 1,4-dichlorobenzene (1,4-DCB) and 1,2-dichlorobenzene (1,2-DCB) removal, the impact of planting, and gaseous MCB emissions from the filter surface were investigated over the course of 1 year in both a vegetated pilot-scale CW and an unplanted reference plot (UR). Annual mean concentration decreases of MCB and 1,4-DCB were observed; however, annual mean 1,2-DCB removal was seen only in the upper filter layer. Planting (Phragmites australis) had a statistically significant beneficial effect on removal. The CB removal efficiency in the CW generally decreased with depth, and seasonal variations of removal were evident, with less concentration decrease during summer. Load removal efficiencies of 59–65% (262–358mgm−2d−1) for MCB, 59–69% (4.0–5.1mgm−2d−1) for 1,4-DCB and 29–42% (0.6–2.1mgm−2d−1) for 1,2-DCB were observed in June and July. Volatilization of MCB from the filter surface accounted for 2–4% of the total amount removed. Simple cover layers of organic materials on the filter surface were suitable for MCB emission reduction. Model calculations were carried out to estimate the MCB removal potential attributable to microbial degradation, volatilisation, and plant uptake in the CW and UR. Microbial degradation was the dominating process. The observed positive impact of plants on MCB removal was caused by improved oxygen supply (due to root oxygen release into the rhizosphere and enhanced water table fluctuations), and direct plant uptake.

KW - Dichlorobenzene

KW - Phytoremediation

KW - Oxygen input

KW - VOC emissions

KW - Modeling

KW - Monochlorobenzene

U2 - 10.1016/j.ecoleng.2011.01.014

DO - 10.1016/j.ecoleng.2011.01.014

JO - Ecological Engineering

JF - Ecological Engineering

SN - 0925-8574

IS - 6

VL - 37

SP - 903

EP - 913

ER -