Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation
This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time cou...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Lamy, Edvina [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2013transfer abstract |
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| Schlagwörter: |
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| Umfang: |
7 |
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| Übergeordnetes Werk: |
Enthalten in: Editorial board - 2015, official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association, Barking |
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| Übergeordnetes Werk: |
volume:83 ; year:2013 ; pages:85-91 ; extent:7 |
| Links: |
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| DOI / URN: |
10.1016/j.ibiod.2013.04.015 |
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ELV033330360 |
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| 245 | 1 | 0 | |a Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation |
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| 520 | |a This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. | ||
| 520 | |a This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. | ||
| 650 | 7 | |a Microbial growth |2 Elsevier | |
| 650 | 7 | |a Hydrocarbon removal |2 Elsevier | |
| 650 | 7 | |a Water content |2 Elsevier | |
| 650 | 7 | |a Respiratory quotient |2 Elsevier | |
| 700 | 1 | |a Tran, Thanh Chi |4 oth | |
| 700 | 1 | |a Mottelet, Stéphane |4 oth | |
| 700 | 1 | |a Pauss, André |4 oth | |
| 700 | 1 | |a Schoefs, Olivier |4 oth | |
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10.1016/j.ibiod.2013.04.015 doi GBVA2013016000022.pica (DE-627)ELV033330360 (ELSEVIER)S0964-8305(13)00184-4 DE-627 ger DE-627 rakwb eng 570 570 DE-600 550 VZ 690 VZ 610 VZ 44.65 bkl Lamy, Edvina verfasserin aut Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. Microbial growth Elsevier Hydrocarbon removal Elsevier Water content Elsevier Respiratory quotient Elsevier Tran, Thanh Chi oth Mottelet, Stéphane oth Pauss, André oth Schoefs, Olivier oth Enthalten in Elsevier Editorial board 2015 official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association Barking (DE-627)ELV018796621 volume:83 year:2013 pages:85-91 extent:7 https://doi.org/10.1016/j.ibiod.2013.04.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.65 Chirurgie VZ AR 83 2013 85-91 7 045F 570 |
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10.1016/j.ibiod.2013.04.015 doi GBVA2013016000022.pica (DE-627)ELV033330360 (ELSEVIER)S0964-8305(13)00184-4 DE-627 ger DE-627 rakwb eng 570 570 DE-600 550 VZ 690 VZ 610 VZ 44.65 bkl Lamy, Edvina verfasserin aut Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. Microbial growth Elsevier Hydrocarbon removal Elsevier Water content Elsevier Respiratory quotient Elsevier Tran, Thanh Chi oth Mottelet, Stéphane oth Pauss, André oth Schoefs, Olivier oth Enthalten in Elsevier Editorial board 2015 official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association Barking (DE-627)ELV018796621 volume:83 year:2013 pages:85-91 extent:7 https://doi.org/10.1016/j.ibiod.2013.04.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.65 Chirurgie VZ AR 83 2013 85-91 7 045F 570 |
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10.1016/j.ibiod.2013.04.015 doi GBVA2013016000022.pica (DE-627)ELV033330360 (ELSEVIER)S0964-8305(13)00184-4 DE-627 ger DE-627 rakwb eng 570 570 DE-600 550 VZ 690 VZ 610 VZ 44.65 bkl Lamy, Edvina verfasserin aut Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. Microbial growth Elsevier Hydrocarbon removal Elsevier Water content Elsevier Respiratory quotient Elsevier Tran, Thanh Chi oth Mottelet, Stéphane oth Pauss, André oth Schoefs, Olivier oth Enthalten in Elsevier Editorial board 2015 official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association Barking (DE-627)ELV018796621 volume:83 year:2013 pages:85-91 extent:7 https://doi.org/10.1016/j.ibiod.2013.04.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.65 Chirurgie VZ AR 83 2013 85-91 7 045F 570 |
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10.1016/j.ibiod.2013.04.015 doi GBVA2013016000022.pica (DE-627)ELV033330360 (ELSEVIER)S0964-8305(13)00184-4 DE-627 ger DE-627 rakwb eng 570 570 DE-600 550 VZ 690 VZ 610 VZ 44.65 bkl Lamy, Edvina verfasserin aut Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. Microbial growth Elsevier Hydrocarbon removal Elsevier Water content Elsevier Respiratory quotient Elsevier Tran, Thanh Chi oth Mottelet, Stéphane oth Pauss, André oth Schoefs, Olivier oth Enthalten in Elsevier Editorial board 2015 official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association Barking (DE-627)ELV018796621 volume:83 year:2013 pages:85-91 extent:7 https://doi.org/10.1016/j.ibiod.2013.04.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.65 Chirurgie VZ AR 83 2013 85-91 7 045F 570 |
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10.1016/j.ibiod.2013.04.015 doi GBVA2013016000022.pica (DE-627)ELV033330360 (ELSEVIER)S0964-8305(13)00184-4 DE-627 ger DE-627 rakwb eng 570 570 DE-600 550 VZ 690 VZ 610 VZ 44.65 bkl Lamy, Edvina verfasserin aut Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. Microbial growth Elsevier Hydrocarbon removal Elsevier Water content Elsevier Respiratory quotient Elsevier Tran, Thanh Chi oth Mottelet, Stéphane oth Pauss, André oth Schoefs, Olivier oth Enthalten in Elsevier Editorial board 2015 official journal of the Biodeterioration Society and groups affiliated to the International Biodeterioration Association Barking (DE-627)ELV018796621 volume:83 year:2013 pages:85-91 extent:7 https://doi.org/10.1016/j.ibiod.2013.04.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.65 Chirurgie VZ AR 83 2013 85-91 7 045F 570 |
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relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation |
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Relationships of respiratory quotient to microbial biomass and hydrocarbon contaminant degradation during soil bioremediation |
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This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. |
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This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. |
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This work focused on monitoring respiratory quotient, RQ (defined as a ratio of CO2 production to O2 uptake rates), microbial growth and residual hydrocarbon concentration during bioremediation experiments performed on laboratory soil microcosms. The aim of the study was to determine if the time course biodegradation profile of the contaminant can be related to the RQ evolution and to investigate the effect of the water content on RQ measurements. A natural soil was artificially contaminated with hexadecane and adjusted with inorganic nutrients to stimulate biodegradation. Microbial growth, CO2 production, O2 uptake and residual hexadecane were periodically monitored at different soil water contents ranging from 0.15 to 0.35 g water g−1 of dry soil. Results showed that microbial activity and contaminant degradation were strongly dependent on soil water content. Maximal growth and hexadecane depletion were obtained at a water content of 0.20 g water g−1 of dry soil, which corresponded to 46.6% of the water holding capacity. Hexadecane degradation was considerably reduced with increasing soil water content. RQ values fluctuated as a function of the hexadecane biodegradation phases. The lowest RQs corresponded to the highest hexadecane depletion and microbial growth. The water content variation did not significantly affect the shape of the RQ evolution curves as a function of time. It only modified the magnitude of RQ values. This study indicates that additional biological and chemical analyses are needed to support RQ data when monitoring contaminant degradation to have an accurate understanding of all the biotic processes, which may occur simultaneously. |
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