Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate
The objective of the current study was to determine the applicability of a sensor-based dynamic control strategy for the treatment of real variable dairy wastewater by aerobic granular sludge (AGS) performing enhanced biological phosphorus removal (EBPR). Two parallel sequencing batch reactors (SBRs...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-12-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/88/11/2707 |
| _version_ | 1797389136870506496 |
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| author | Flinn De Vleeschauwer Jan Dries |
| author_facet | Flinn De Vleeschauwer Jan Dries |
| author_sort | Flinn De Vleeschauwer |
| collection | DOAJ |
| description | The objective of the current study was to determine the applicability of a sensor-based dynamic control strategy for the treatment of real variable dairy wastewater by aerobic granular sludge (AGS) performing enhanced biological phosphorus removal (EBPR). Two parallel sequencing batch reactors (SBRs) were set up that used only an anaerobic feast/aerobic famine microbial selection strategy to successfully obtain sludge granulation. SBR-STA used a fixed cycle length, while the duration of the reaction steps in SBR-DYN was variable. The control strategy was based solely on (derived) signals from low-cost and common sensors. The profile of the electric conductivity during the anaerobic reaction step was related to the microbial release of phosphate (PO4-P) and the associated uptake of dissolved organic carbon (DOC) by polyphosphate-accumulating organisms (PAOs). Control of the aerobic reaction step was based on the oxygen uptake rate (OUR). This resulted in a dynamic reactor operation with significant efficiency gains, such as 32% shorter cycle times and 42% higher sludge loading rates without impairing the effluent quality. These results extend the existing potential of indirect control strategies to full biological nutrient removal processes, which may be of great assistance to the operators and designers of industrial installations.
HIGHLIGHTS
Aerobic granulation was achieved by an anaerobic feast/aerobic famine operation in sequencing batch reactors treating real dairy wastewater.;
Enhanced biological phosphorus removal (EBPR) was stable and efficient.;
The duration of the reaction steps could be controlled using electric conductivity and oxygen uptake rate.;
Significant efficiency gains can be reached by using dynamic control strategies in the operation of AGS systems.; |
| first_indexed | 2024-03-08T22:51:28Z |
| format | Article |
| id | doaj.art-4e7fb3d6f5c14dd48d24d2d27ee08538 |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-03-08T22:51:28Z |
| publishDate | 2023-12-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-4e7fb3d6f5c14dd48d24d2d27ee085382023-12-16T11:35:44ZengIWA PublishingWater Science and Technology0273-12231996-97322023-12-0188112707271810.2166/wst.2023.361361Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rateFlinn De Vleeschauwer0Jan Dries1 Research Group BioWAVE, Biochemical Wastewater Valorisation and Engineering, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium Research Group BioWAVE, Biochemical Wastewater Valorisation and Engineering, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium The objective of the current study was to determine the applicability of a sensor-based dynamic control strategy for the treatment of real variable dairy wastewater by aerobic granular sludge (AGS) performing enhanced biological phosphorus removal (EBPR). Two parallel sequencing batch reactors (SBRs) were set up that used only an anaerobic feast/aerobic famine microbial selection strategy to successfully obtain sludge granulation. SBR-STA used a fixed cycle length, while the duration of the reaction steps in SBR-DYN was variable. The control strategy was based solely on (derived) signals from low-cost and common sensors. The profile of the electric conductivity during the anaerobic reaction step was related to the microbial release of phosphate (PO4-P) and the associated uptake of dissolved organic carbon (DOC) by polyphosphate-accumulating organisms (PAOs). Control of the aerobic reaction step was based on the oxygen uptake rate (OUR). This resulted in a dynamic reactor operation with significant efficiency gains, such as 32% shorter cycle times and 42% higher sludge loading rates without impairing the effluent quality. These results extend the existing potential of indirect control strategies to full biological nutrient removal processes, which may be of great assistance to the operators and designers of industrial installations. HIGHLIGHTS Aerobic granulation was achieved by an anaerobic feast/aerobic famine operation in sequencing batch reactors treating real dairy wastewater.; Enhanced biological phosphorus removal (EBPR) was stable and efficient.; The duration of the reaction steps could be controlled using electric conductivity and oxygen uptake rate.; Significant efficiency gains can be reached by using dynamic control strategies in the operation of AGS systems.;http://wst.iwaponline.com/content/88/11/2707enhanced biological phosphorus removal (ebpr)glycogen-accumulating organisms (gaos)indirect control strategiesindustrial wastewatermicrobial selectionpolyphosphate-accumulating organisms (paos) |
| spellingShingle | Flinn De Vleeschauwer Jan Dries Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate Water Science and Technology enhanced biological phosphorus removal (ebpr) glycogen-accumulating organisms (gaos) indirect control strategies industrial wastewater microbial selection polyphosphate-accumulating organisms (paos) |
| title | Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| title_full | Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| title_fullStr | Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| title_full_unstemmed | Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| title_short | Full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| title_sort | full dynamic control of dairy wastewater treatment by aerobic granular sludge using electric conductivity and oxygen uptake rate |
| topic | enhanced biological phosphorus removal (ebpr) glycogen-accumulating organisms (gaos) indirect control strategies industrial wastewater microbial selection polyphosphate-accumulating organisms (paos) |
| url | http://wst.iwaponline.com/content/88/11/2707 |
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