The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Janine Gibert - One of the best experts on this subject based on the ideXlab platform.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to quantify the influences of tubificid worms on the biogeochemical functioning of an infiltration system impacted by a stormwater sediment deposit. Effects of worms with stormwater sediment deposit were compared with effects of worms with two other natural sediment deposits (one low and one rich-particulate organic matter deposits). We measured the effects of invertebrates on sediment reworking, organic matter processing, solute fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had slight effects on microbial activities in presence of the stormwater deposit whereas they significantly stimulated microbial activities in columns impacted by the other two deposits. High contents of labile organic matter contained in stormwater sediments probably led to very strong microbial activities that could not be easily stimulated by worm activities. In our experimental conditions, no significant influence of tubificid worms on the Fate of Pollutants (heavy metals and PAHs) contained in the stormwater deposit was measured. In conclusion, our study demonstrated that the organic matter characteristics of the stormwater sediments limited the efficiency of tubificid worms to stimulate organic matter mineralization in infiltration systems.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems?
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to examine the influence of tubificid worms on the biogeochemical functioning of water-sediment interface impacted by a stormwater particle deposit. Two other natural particle deposits (one low and one rich POM-deposits) were studied to compare their effects with those of the stormwater deposit in infiltration columns. We measured the effects of invertebrates on sediment reworking, organic matter processing, nutrient fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had lower effects on microbial activities in the stormwater deposit columns than in columns impacted by the other two deposits. The high lability of the POM of stormwater deposit led to a high microbial activity in the system that could not be easily stimulated by invertebrates under our infiltration conditions. In contrast, tubificid worms stimulated biogeochemical processes in more refractory deposits. Moreover, tubificid worms did not influence the Fate of Pollutants (heavy metals and PAHs) of the stormwater deposit because the chemical characteristics of this polluted deposit acted as a sink for most contaminants. Therefore, our study demonstrated that the influence of invertebrates on biogeochemical processes in sediments was strongly linked to the organic matter characteristics of the sediments (quantity and quality of POM).
Geraldine Nogaro - One of the best experts on this subject based on the ideXlab platform.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to quantify the influences of tubificid worms on the biogeochemical functioning of an infiltration system impacted by a stormwater sediment deposit. Effects of worms with stormwater sediment deposit were compared with effects of worms with two other natural sediment deposits (one low and one rich-particulate organic matter deposits). We measured the effects of invertebrates on sediment reworking, organic matter processing, solute fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had slight effects on microbial activities in presence of the stormwater deposit whereas they significantly stimulated microbial activities in columns impacted by the other two deposits. High contents of labile organic matter contained in stormwater sediments probably led to very strong microbial activities that could not be easily stimulated by worm activities. In our experimental conditions, no significant influence of tubificid worms on the Fate of Pollutants (heavy metals and PAHs) contained in the stormwater deposit was measured. In conclusion, our study demonstrated that the organic matter characteristics of the stormwater sediments limited the efficiency of tubificid worms to stimulate organic matter mineralization in infiltration systems.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems?
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to examine the influence of tubificid worms on the biogeochemical functioning of water-sediment interface impacted by a stormwater particle deposit. Two other natural particle deposits (one low and one rich POM-deposits) were studied to compare their effects with those of the stormwater deposit in infiltration columns. We measured the effects of invertebrates on sediment reworking, organic matter processing, nutrient fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had lower effects on microbial activities in the stormwater deposit columns than in columns impacted by the other two deposits. The high lability of the POM of stormwater deposit led to a high microbial activity in the system that could not be easily stimulated by invertebrates under our infiltration conditions. In contrast, tubificid worms stimulated biogeochemical processes in more refractory deposits. Moreover, tubificid worms did not influence the Fate of Pollutants (heavy metals and PAHs) of the stormwater deposit because the chemical characteristics of this polluted deposit acted as a sink for most contaminants. Therefore, our study demonstrated that the influence of invertebrates on biogeochemical processes in sediments was strongly linked to the organic matter characteristics of the sediments (quantity and quality of POM).
Vincent Gagnon - One of the best experts on this subject based on the ideXlab platform.
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effect of plant species on sludge dewatering and Fate of Pollutants in sludge treatment wetlands
Ecological Engineering, 2013Co-Authors: Vincent Gagnon, Florent Chazarenc, Yves Comeau, Jacques BrissonAbstract:a b s t r a c t Plants are assumed to play a central role in sludge treatment wetlands (STWs) by preventing clogging, favouring dewatering and improving sludge mineralisation. However, few comparative studies have been made to assess the influence of plants presence or species on the treatment of sludge in STWs. Therefore, the aim of this study was to evaluate the effect of three plant species on sludge dewatering and miner- alisation, and on the general Fate of water and Pollutants in STWs. The experimental setup consisted of mesocosm sized STWs planted with monocultures of Phragmites australis, Typha angustifolia and Scirpus fluviatilis, in addition to an unplanted control, each in duplicate. The mesocosms were fed with settled fish farm sludge for three summers, and the effect of plants was assessed according to the percentage of Pollutants per mass of dry sludge (pollutant content), in addition to a mass balance analysis of Pollutants in the STWs. Results revealed that the standard method for assessing STW efficiency (i.e. sludge Pollutants content) is inadequate when comparing the subtle effect of plant species and that a mass balance analysis should be used instead. Mass balance showed that Pollutants were mainly retained within the sludge cake, while the rest was considered trapped inside the STWs or mineralised. Only a small percentage of Pollutants was discharged at the effluent (from <0.1% to 5% of total Pollutants input). Plant species had a distinct effect on Pollutants, which differed according to the sampling location in the STWs. At the outlet, pollutant removal was more efficient in the planted system and was significantly different according to plant species. In the sludge cake, contrary to common assumptions, STWs planted with T. angustifolia and S. fluviatilis had generally higher sludge cake volume, mass of organic matter, nitrogen and phosphorus, when compared to the unplanted control. This was attributed to the presence of plant litter in the sludge cake, which mitigated mineralisation. In contrast, STWs planted with P. australis resulted in the highest reduction in sludge volume and were the most efficient for sludge dewatering and mineralisation of organic matter in comparison to other species and the unplanted control. A fraction of the nitrogen and phosphorus was also sequestered in plant tissues, which represented close to a quarter of the nitrogen input by the sludge in P. australis STWs. This study shows that the presence of plants and the choice of plant species is an important factor that affects sludge dewatering and mineralisation, but also the general Fate of water and Pollutants in STWs. Further studies should be done in a full size STW to validate the finding obtained in this mesocosm experiment.
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Effect of plant species on sludge dewatering and Fate of Pollutants in sludge treatment wetlands
Ecological Engineering, 2013Co-Authors: Vincent Gagnon, Florent Chazarenc, Yves Comeau, Julie BrissonAbstract:Plants are assumed to play a central role in sludge treatment wetlands (STWs) by preventing clogging, favouring dewatering and improving sludge mineralisation. However, few comparative studies have been made to assess the influence of plants presence or species on the treatment of sludge in STWs. Therefore, the aim of this study was to evaluate the effect of three plant species on sludge dewatering and mineralisation, and on the general Fate of water and Pollutants in STWs. The experimental setup consisted of mesocosm sized STWs planted with monocultures of Phragmites australis, Typha angustifolia and Scirpus fluviatilis, in addition to an unplanted control, each in duplicate. The mesocosms were fed with settled fish farm sludge for three summers, and the effect of plants was assessed according to the percentage of Pollutants per mass of dry sludge (pollutant content), in addition to a mass balance analysis of Pollutants in the STWs.Results revealed that the standard method for assessing STW efficiency (i.e. sludge Pollutants content) is inadequate when comparing the subtle effect of plant species and that a mass balance analysis should be used instead. Mass balance showed that Pollutants were mainly retained within the sludge cake, while the rest was considered trapped inside the STWs or mineralised. Only a small percentage of Pollutants was discharged at the effluent (from
Florian Mermillod-blondin - One of the best experts on this subject based on the ideXlab platform.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to quantify the influences of tubificid worms on the biogeochemical functioning of an infiltration system impacted by a stormwater sediment deposit. Effects of worms with stormwater sediment deposit were compared with effects of worms with two other natural sediment deposits (one low and one rich-particulate organic matter deposits). We measured the effects of invertebrates on sediment reworking, organic matter processing, solute fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had slight effects on microbial activities in presence of the stormwater deposit whereas they significantly stimulated microbial activities in columns impacted by the other two deposits. High contents of labile organic matter contained in stormwater sediments probably led to very strong microbial activities that could not be easily stimulated by worm activities. In our experimental conditions, no significant influence of tubificid worms on the Fate of Pollutants (heavy metals and PAHs) contained in the stormwater deposit was measured. In conclusion, our study demonstrated that the organic matter characteristics of the stormwater sediments limited the efficiency of tubificid worms to stimulate organic matter mineralization in infiltration systems.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems?
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to examine the influence of tubificid worms on the biogeochemical functioning of water-sediment interface impacted by a stormwater particle deposit. Two other natural particle deposits (one low and one rich POM-deposits) were studied to compare their effects with those of the stormwater deposit in infiltration columns. We measured the effects of invertebrates on sediment reworking, organic matter processing, nutrient fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had lower effects on microbial activities in the stormwater deposit columns than in columns impacted by the other two deposits. The high lability of the POM of stormwater deposit led to a high microbial activity in the system that could not be easily stimulated by invertebrates under our infiltration conditions. In contrast, tubificid worms stimulated biogeochemical processes in more refractory deposits. Moreover, tubificid worms did not influence the Fate of Pollutants (heavy metals and PAHs) of the stormwater deposit because the chemical characteristics of this polluted deposit acted as a sink for most contaminants. Therefore, our study demonstrated that the influence of invertebrates on biogeochemical processes in sediments was strongly linked to the organic matter characteristics of the sediments (quantity and quality of POM).
Bernard Montuelle - One of the best experts on this subject based on the ideXlab platform.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to quantify the influences of tubificid worms on the biogeochemical functioning of an infiltration system impacted by a stormwater sediment deposit. Effects of worms with stormwater sediment deposit were compared with effects of worms with two other natural sediment deposits (one low and one rich-particulate organic matter deposits). We measured the effects of invertebrates on sediment reworking, organic matter processing, solute fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had slight effects on microbial activities in presence of the stormwater deposit whereas they significantly stimulated microbial activities in columns impacted by the other two deposits. High contents of labile organic matter contained in stormwater sediments probably led to very strong microbial activities that could not be easily stimulated by worm activities. In our experimental conditions, no significant influence of tubificid worms on the Fate of Pollutants (heavy metals and PAHs) contained in the stormwater deposit was measured. In conclusion, our study demonstrated that the organic matter characteristics of the stormwater sediments limited the efficiency of tubificid worms to stimulate organic matter mineralization in infiltration systems.
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Do tubificid worms influence organic matter processing and Fate of Pollutants in stormwater sediments deposited at the surface of infiltration systems?
Chemosphere, 2007Co-Authors: Geraldine Nogaro, Florian Mermillod-blondin, Bernard Montuelle, Jean-claude Boisson, Michel Lafont, Bernadette Volat, Janine GibertAbstract:The purpose of this study was to examine the influence of tubificid worms on the biogeochemical functioning of water-sediment interface impacted by a stormwater particle deposit. Two other natural particle deposits (one low and one rich POM-deposits) were studied to compare their effects with those of the stormwater deposit in infiltration columns. We measured the effects of invertebrates on sediment reworking, organic matter processing, nutrient fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had lower effects on microbial activities in the stormwater deposit columns than in columns impacted by the other two deposits. The high lability of the POM of stormwater deposit led to a high microbial activity in the system that could not be easily stimulated by invertebrates under our infiltration conditions. In contrast, tubificid worms stimulated biogeochemical processes in more refractory deposits. Moreover, tubificid worms did not influence the Fate of Pollutants (heavy metals and PAHs) of the stormwater deposit because the chemical characteristics of this polluted deposit acted as a sink for most contaminants. Therefore, our study demonstrated that the influence of invertebrates on biogeochemical processes in sediments was strongly linked to the organic matter characteristics of the sediments (quantity and quality of POM).
