Enhanced degradation of diesel-originated pollutants using phragmites planted intensified-wetlands aided with aeration, surfactant and nutrients

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Diesel oil spills may considerably damage the environment, especially the sensitive coastal areas and oil drilling sites. A serie of laboratory experiments were conducted for 60 days on diesel oil spiked (2% v/v) intensified wetlands (IW), planted with Phragmites australis. In the experiments the IW were externally assisted with aeration, surfactant and nutrients. This novel study assesses the performance of diesel oil spiked IW by monitoring the cumulative as well as individual effect of (1) aeration (dissolved oxygen level, ≥7.0±1 mg L-1), (2) nutrients (NPK fertiliser, 100mg L-1) and (3) surfactant, tween-20 (0.2% v/v). The performance of IW was evaluated by measuring root length, shoot length, plant biomass (Phragmites), diesel oil degradation and its transformation into other compounds using Fourier Transform Infrared (FTIR) spectroscopy. The results showed that a synergistic effect of aeration, nutrients and surfactant have a positive role on the overall growth of Phragmites as highest increment in biomass was achieved in IW (30.6%) compared to control (8.5%). However, the individual effect of aeration, nutrients and surfactant on plant biomass was 19.5, 10.1 and 12.4% respectively compared to control (8.5%). The highest plant biomass (fresh weight % increase) was associated with those IW, that received aeration (dissolved oxygen maintained at ≥ 7mg L-1). Furthermore, FTIR data also revealed that synergetic effect of aeration, nutrients and surfactant can completely degrade alkanes (CH2, CH3 angular deformation), aldehydes (C-H stretch), carboxylic acid dimers (C=O stretching), primary amides, Alkenes (C=C stretch), nitro compounds (N-O stretch), aliphatic esters (C-O stretch), sulfoxides (S=O stretching) and aromatic hydrocarbons group (=C–H stretch) present in diesel oil (frequency range 1458-675 cm-1). Thus it can be concluded that synergistic effect of aeration, surfactant and nutrients can degrade diesel oil in Phragmites planted IW and hence can be served as an effective treatment option in the field of wetlands. Moreover, this novel study provides a database for further evaluations and support to design optimal treatments strategies in restoration of diesel contaminated area through intensified wetlands.
TitelBook of Abstracts 8th International Symposium on Wetland Pollutant Dynamics and Control : 17 – 21 June, 2019, Aarhus University, Denmark
RedaktørerCarlos A. Arias, Carlos A. Ramírez-Vargas, Lorena Peñacoba-Antona, Hans Brix
Antal sider1
ForlagAarhus University
ISBN (trykt)978-87-971486-0-0
ISBN (Elektronisk)978-87-971486-1-7
StatusUdgivet - 2019
BegivenhedWETPOL2019: 8th International Symposium on Wetland Pollutants Dynamics and Control - Aarhus Universitet, Aarhus, Danmark
Varighed: 17 jun. 201921 jun. 2019
Konferencens nummer: 8


KonferenceWETPOL2019: 8th International Symposium on Wetland Pollutants Dynamics and Control
LokationAarhus Universitet

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