Hydraulic characterization and start-up of a novel circulating flow bio-carriers
Abstract High-quality biofilm carriers are crucial for the formation of biofilm, but problems such as slow biofilm growth on the carrier surface have been troubling a large number of researchers. The addition of a carrier changes the flow state in the reactor, which in turn affects the microbial att...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-03-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-56857-x |
| _version_ | 1797259336769077248 |
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| author | Xingyu Li Guang Li Yunyong Yu Hongsheng Jia Xiaoning Ma Hong Yang Prince Atta Opoku |
| author_facet | Xingyu Li Guang Li Yunyong Yu Hongsheng Jia Xiaoning Ma Hong Yang Prince Atta Opoku |
| author_sort | Xingyu Li |
| collection | DOAJ |
| description | Abstract High-quality biofilm carriers are crucial for the formation of biofilm, but problems such as slow biofilm growth on the carrier surface have been troubling a large number of researchers. The addition of a carrier changes the flow state in the reactor, which in turn affects the microbial attachment and the quantity of microorganisms. Also, aerobic microorganisms need to use dissolved oxygen in the water to remove water pollutants. In this paper, a novel recirculating flow carrier with a hollow cylinder structure is proposed, with a certain number of hollow inverted circular plates placed at equal distances inside. In this paper, the hydraulic residence time, aeration volume, and the spacing of the inflow plates of the recirculating flow biofilm carrier, which are three important factors affecting the hydraulic characteristics of the reactor, are first investigated. At the same time, it was compared with the common combined carrier to find the optimal operating conditions for the hydraulic characteristics. Secondly, a reactor start-up study was carried out to confirm that the new recirculating flow biofilm carrier could accelerate the biofilm growth by changing the hydraulic characteristics. The results showed that under the same conditions, the hydraulic properties of the reactor were better with the addition of the recirculating flow carrier, with an effective volume ratio of 98% and a significant reduction in short flows and dead zones. The stabilized removal of COD, NH3-N, and TN in the reactor with the addition of the recirculating flow carrier reached about 94%, 99%, and 91% respectively, at the beginning of the 15th day, which effectively proved the feasibility of the recirculating flow carrier. |
| first_indexed | 2024-04-24T23:07:49Z |
| format | Article |
| id | doaj.art-2b9fc539b6624821ad2565a9a1035bc9 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T23:07:49Z |
| publishDate | 2024-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-2b9fc539b6624821ad2565a9a1035bc92024-03-17T12:22:43ZengNature PortfolioScientific Reports2045-23222024-03-0114111310.1038/s41598-024-56857-xHydraulic characterization and start-up of a novel circulating flow bio-carriersXingyu Li0Guang Li1Yunyong Yu2Hongsheng Jia3Xiaoning Ma4Hong Yang5Prince Atta Opoku6Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu UniversityKey Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu UniversityKey Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu UniversityKey Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu UniversityKey Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu UniversityShanghai Investigation, Design & Research Institute Co., LtdSchool of Environment, Harbin Institute of TechnologyAbstract High-quality biofilm carriers are crucial for the formation of biofilm, but problems such as slow biofilm growth on the carrier surface have been troubling a large number of researchers. The addition of a carrier changes the flow state in the reactor, which in turn affects the microbial attachment and the quantity of microorganisms. Also, aerobic microorganisms need to use dissolved oxygen in the water to remove water pollutants. In this paper, a novel recirculating flow carrier with a hollow cylinder structure is proposed, with a certain number of hollow inverted circular plates placed at equal distances inside. In this paper, the hydraulic residence time, aeration volume, and the spacing of the inflow plates of the recirculating flow biofilm carrier, which are three important factors affecting the hydraulic characteristics of the reactor, are first investigated. At the same time, it was compared with the common combined carrier to find the optimal operating conditions for the hydraulic characteristics. Secondly, a reactor start-up study was carried out to confirm that the new recirculating flow biofilm carrier could accelerate the biofilm growth by changing the hydraulic characteristics. The results showed that under the same conditions, the hydraulic properties of the reactor were better with the addition of the recirculating flow carrier, with an effective volume ratio of 98% and a significant reduction in short flows and dead zones. The stabilized removal of COD, NH3-N, and TN in the reactor with the addition of the recirculating flow carrier reached about 94%, 99%, and 91% respectively, at the beginning of the 15th day, which effectively proved the feasibility of the recirculating flow carrier.https://doi.org/10.1038/s41598-024-56857-xCirculating flow carrierTracer testFlow patternHydraulic propertiesStart-upEfficiency |
| spellingShingle | Xingyu Li Guang Li Yunyong Yu Hongsheng Jia Xiaoning Ma Hong Yang Prince Atta Opoku Hydraulic characterization and start-up of a novel circulating flow bio-carriers Scientific Reports Circulating flow carrier Tracer test Flow pattern Hydraulic properties Start-up Efficiency |
| title | Hydraulic characterization and start-up of a novel circulating flow bio-carriers |
| title_full | Hydraulic characterization and start-up of a novel circulating flow bio-carriers |
| title_fullStr | Hydraulic characterization and start-up of a novel circulating flow bio-carriers |
| title_full_unstemmed | Hydraulic characterization and start-up of a novel circulating flow bio-carriers |
| title_short | Hydraulic characterization and start-up of a novel circulating flow bio-carriers |
| title_sort | hydraulic characterization and start up of a novel circulating flow bio carriers |
| topic | Circulating flow carrier Tracer test Flow pattern Hydraulic properties Start-up Efficiency |
| url | https://doi.org/10.1038/s41598-024-56857-x |
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