Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment
Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Yu, J. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2000 |
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| Schlagwörter: |
Upflow Anaerobic Sludge Blanket |
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| Anmerkung: |
© Springer-Verlag Berlin Heidelberg 2000 |
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| Übergeordnetes Werk: |
Enthalten in: Bioprocess engineering - Springer-Verlag, 1986, 22(2000), 4 vom: Apr., Seite 315-322 |
|---|---|
| Übergeordnetes Werk: |
volume:22 ; year:2000 ; number:4 ; month:04 ; pages:315-322 |
| Links: |
|---|
| DOI / URN: |
10.1007/s004490050738 |
|---|
| Katalog-ID: |
OLC2106605684 |
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| 520 | |a Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. | ||
| 650 | 4 | |a Hydraulic Retention Time | |
| 650 | 4 | |a Upflow Anaerobic Sludge Blanket | |
| 650 | 4 | |a Upflow Anaerobic Sludge Blanket Reactor | |
| 650 | 4 | |a Sludge Granule | |
| 650 | 4 | |a Anaerobic Biomass | |
| 700 | 1 | |a Chen, H. |4 aut | |
| 700 | 1 | |a Ji, M. |4 aut | |
| 700 | 1 | |a Yue, P. L. |4 aut | |
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10.1007/s004490050738 doi (DE-627)OLC2106605684 (DE-He213)s004490050738-p DE-627 ger DE-627 rakwb eng 570 690 540 VZ 12 ssgn Yu, J. verfasserin aut Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2000 Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. Hydraulic Retention Time Upflow Anaerobic Sludge Blanket Upflow Anaerobic Sludge Blanket Reactor Sludge Granule Anaerobic Biomass Chen, H. aut Ji, M. aut Yue, P. L. aut Enthalten in Bioprocess engineering Springer-Verlag, 1986 22(2000), 4 vom: Apr., Seite 315-322 (DE-627)129208922 (DE-600)55154-5 (DE-576)01445761X 0178-515X nnns volume:22 year:2000 number:4 month:04 pages:315-322 https://doi.org/10.1007/s004490050738 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_11 GBV_ILN_23 GBV_ILN_32 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_4046 GBV_ILN_4277 GBV_ILN_4307 GBV_ILN_4310 GBV_ILN_4328 AR 22 2000 4 04 315-322 |
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10.1007/s004490050738 doi (DE-627)OLC2106605684 (DE-He213)s004490050738-p DE-627 ger DE-627 rakwb eng 570 690 540 VZ 12 ssgn Yu, J. verfasserin aut Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2000 Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. Hydraulic Retention Time Upflow Anaerobic Sludge Blanket Upflow Anaerobic Sludge Blanket Reactor Sludge Granule Anaerobic Biomass Chen, H. aut Ji, M. aut Yue, P. L. aut Enthalten in Bioprocess engineering Springer-Verlag, 1986 22(2000), 4 vom: Apr., Seite 315-322 (DE-627)129208922 (DE-600)55154-5 (DE-576)01445761X 0178-515X nnns volume:22 year:2000 number:4 month:04 pages:315-322 https://doi.org/10.1007/s004490050738 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_11 GBV_ILN_23 GBV_ILN_32 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_4046 GBV_ILN_4277 GBV_ILN_4307 GBV_ILN_4310 GBV_ILN_4328 AR 22 2000 4 04 315-322 |
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10.1007/s004490050738 doi (DE-627)OLC2106605684 (DE-He213)s004490050738-p DE-627 ger DE-627 rakwb eng 570 690 540 VZ 12 ssgn Yu, J. verfasserin aut Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2000 Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. Hydraulic Retention Time Upflow Anaerobic Sludge Blanket Upflow Anaerobic Sludge Blanket Reactor Sludge Granule Anaerobic Biomass Chen, H. aut Ji, M. aut Yue, P. L. aut Enthalten in Bioprocess engineering Springer-Verlag, 1986 22(2000), 4 vom: Apr., Seite 315-322 (DE-627)129208922 (DE-600)55154-5 (DE-576)01445761X 0178-515X nnns volume:22 year:2000 number:4 month:04 pages:315-322 https://doi.org/10.1007/s004490050738 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_11 GBV_ILN_23 GBV_ILN_32 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_4046 GBV_ILN_4277 GBV_ILN_4307 GBV_ILN_4310 GBV_ILN_4328 AR 22 2000 4 04 315-322 |
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10.1007/s004490050738 doi (DE-627)OLC2106605684 (DE-He213)s004490050738-p DE-627 ger DE-627 rakwb eng 570 690 540 VZ 12 ssgn Yu, J. verfasserin aut Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2000 Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. Hydraulic Retention Time Upflow Anaerobic Sludge Blanket Upflow Anaerobic Sludge Blanket Reactor Sludge Granule Anaerobic Biomass Chen, H. aut Ji, M. aut Yue, P. L. aut Enthalten in Bioprocess engineering Springer-Verlag, 1986 22(2000), 4 vom: Apr., Seite 315-322 (DE-627)129208922 (DE-600)55154-5 (DE-576)01445761X 0178-515X nnns volume:22 year:2000 number:4 month:04 pages:315-322 https://doi.org/10.1007/s004490050738 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_11 GBV_ILN_23 GBV_ILN_32 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_4046 GBV_ILN_4277 GBV_ILN_4307 GBV_ILN_4310 GBV_ILN_4328 AR 22 2000 4 04 315-322 |
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10.1007/s004490050738 doi (DE-627)OLC2106605684 (DE-He213)s004490050738-p DE-627 ger DE-627 rakwb eng 570 690 540 VZ 12 ssgn Yu, J. verfasserin aut Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2000 Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. Hydraulic Retention Time Upflow Anaerobic Sludge Blanket Upflow Anaerobic Sludge Blanket Reactor Sludge Granule Anaerobic Biomass Chen, H. aut Ji, M. aut Yue, P. L. aut Enthalten in Bioprocess engineering Springer-Verlag, 1986 22(2000), 4 vom: Apr., Seite 315-322 (DE-627)129208922 (DE-600)55154-5 (DE-576)01445761X 0178-515X nnns volume:22 year:2000 number:4 month:04 pages:315-322 https://doi.org/10.1007/s004490050738 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_11 GBV_ILN_23 GBV_ILN_32 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_4046 GBV_ILN_4277 GBV_ILN_4307 GBV_ILN_4310 GBV_ILN_4328 AR 22 2000 4 04 315-322 |
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distribution and change of microbial activity in combined uasb and afb reactors for wastewater treatment |
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Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment |
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Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. © Springer-Verlag Berlin Heidelberg 2000 |
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Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. © Springer-Verlag Berlin Heidelberg 2000 |
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Abstract A thermophilic upflow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic fluidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD $ l^{−1} $. The COD removal efficiency reached 75% with a removal rate of 0.2 g COD $ l^{−1} $ $ h^{−1} $ at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and specific ATP content of the biomass. In the UASB reactor, the difference in specific ATP was significant between the sludge bed and blanket solution (0.02 mg ATP g $ VS^{−1} $ versus 0.85 mg ATP g $ VS^{−1} $) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher specific ATP than the biomass fixed in polyurethane carriers (1.6 mg ATP g $ VS^{−1} $ versus 1.1 mg ATP g $ VS^{−1} $), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system. © Springer-Verlag Berlin Heidelberg 2000 |
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