Removal of PAHs from laboratory columns simulating the humus upper layer of vertical flow constructed wetlands

Cottin, Nathalie; Merlin, Gérard

doi:10.1016/j.chemosphere.2008.06.060

Cited by 25 publications

(12 citation statements)

References 27 publications

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“…The study by Cottin and Merlin [12] has demonstrated that the use of organic matter or compost layer could retain and degrade Pahs, this probably due to the presence of Pah-degrading microorganisms in the organic layer where humification processes occur [30]. The results in present research suggested that Pah reduction was mainly attributed to uptake by reed roots, as well as transformation and reinforced degradation around the rhizosphere microcosms.…”

Section: Discussionsupporting

confidence: 54%

“…it is worth to note that the plants growed in the soil polluted with Pahs could immobilize, remove and degrade Pahs by rhizosphere processes [27] and would therefore vary across plant species [28]. While in CW wastewater treatment system, it suggested that the absorption in solid media is the main mechanism for Pahs removal from wastewater [11,12].…”

Section: Discussionmentioning

confidence: 99%

“…accordingly, CW technology (especially reed bed) provides a new method for Pahs degradation and transformation in wastewater sludge [3,5]. Most research about Pahs remove mainly come from CW waste water treatment system, the subsurface CW system was discovered to have a good performance on Pahs removal and the average removal of Pahs was 79.2% [11]; Cottin and Merlin investigated the PAHs removal by using four laboratory columns filled with two different organic media, the results showed a great removal of PAHs (> 95%) from wastewater [12]. While the Pahs removal from wastewater is different from that of sludge, in this study, we used constructed wetlands to stabilize wastewater sludge and examined the Pahs distribution and degradation during the sludge stabilization process to provide a robust scientific basis for use of sludge in agriculture.…”

Section: Olycyclic Aromatic Hydrocarbons (Pahs)mentioning

confidence: 99%

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Phytoremediation of PAHs-contaminated Sludge in a Constructed Wetland

Cui¹,

Wang²,

Chen³

2017

JRST

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Wastewater sludge from metropolitan areas has become a source of polycyclic aromatic hydrocarbons (PAHs), and may result in pollution of soils and plants if applied to agricultural areas. It is important to stabilize wastewater sludge before its application to agricultural land. Constructed wetlands (CWs) have been widely applied for stabilization of sludge. In CWs, plants, especially reeds, promote degradation of pollutants in the rhizosphere and are the principal mechanisms for PAH-contaminated sludge phytoremediation. We studied PAH removal in sludge planted with Phragmites australis (common reeds) in onsite experiments over a 3-year period comprising 2 years of sludge application and 1 year of resting. The average PAH content in the feeder sludge was 5.7 mg kg -1 (DW), consisting of approximately 48% low-molecular-weight (2-3 ring) PAHs, 27% middle-molecular-weight (4 ring) PAHs and 25% high-molecular-weight (5-6 ring) PAHs. After 3 years, the average PAH content in stabilized sludge was 2.1 mg kg -1 (DW), which was lower than that of the feeder sludge. Overall, about 66% of low-molecular-weight PAHs (dominant type), 57% of middle-molecular-weight PAHs and 32% of high-molecular-weight PAHs were removed from the stabilized sludge. Additionally, there were spatial variations in PAHs in stabilized sludge, with PAHs being highest in the surface layer (12-14 cm) sludge, lower in the middle layer (6-8 cm) and lowest in the bottom layer (0-2 cm).

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Olycyclic Aromatic Hydrocarbons (Pahs)mentioning

confidence: 99%

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Phytoremediation of PAHs-contaminated Sludge in a Constructed Wetland

Cui¹,

Wang²,

Chen³

2017

JRST

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“…Road/highway stormwater runoff is a major source of contaminants and one of the most frequent sources of surface water pollution (Terzakis et al, 2008;Cottin and Merlin, 2008;Lundy et al, 2011). Heavy traffic flows generate numerous contaminants directly or indirectly in the form of motor vehicle emissions, crankcase oil drips, vehicle tire wear and particles from asphalt road surfaces, etc.…”

Section: Introductionmentioning

confidence: 99%

Floating treatment wetlands for heavy metal removal in highway stormwater ponds

Ladislas

Gérente

Chazarenc

et al. 2015

Ecological Engineering

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“…Adsorption onto the substrate or organic matter is also the key pathway to remove these organic pollutants due to their high adsorption affinity (Polprasert et al, 1996;Cottin and Merlin, 2008). The adsorption of organic pollutants can be reflected by their enrichment in the sediment.…”

Section: Removal Of Pollutantsmentioning

confidence: 99%