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Sludge Rising and Critical Time Prediction for Denitrification in Secondary Clarifiers: Experimental and Computational Fluid Dynamics Studies
Fan, Long1,2; Xiao, Yao2; Liu, Qiao1,3; Xu, Nong1,3; Dong, Qiang1,3; Shi, Hanchang2; Ding, Aiqin1
2021-06-11
Source PublicationENVIRONMENTAL ENGINEERING SCIENCE
ISSN1092-8758
Pages9
AbstractIn this study, we investigated the sludge rising process during denitrification, especially its hydrodynamics, with both experiments and computational fluid dynamics (CFD) modeling. The rising process was observed and divided into three stages: bubble-forming, sludge particles rising with isolated bubbles, and sludge blanket rising. A new solid phase denoted as lighter sludge was introduced in the CFD simulation to bridge the gap between the simulation and the reality. We simulated the three-phase (wastewater, normal activated sludge, and lighter sludge) turbulent flow in the secondary clarifier. CFD simulation agreed with the experiments and math-model results. Lighter sludge dominated the effluent quality during the denitrification process. Sludge blanket rising started at scattered points in the bottom hopper. A 30-min window occurred between the rising of the sludge blanket and the worsening of effluent quality, which could be regarded as a critical time to prevent sludge from rising.
Keywordcomputational fluid dynamics (CFD) critical time denitrification lighter sludge sludge rising
DOI10.1089/ees.2021.0163
Language英语
WOS KeywordMATHEMATICAL-MODEL ; DESIGN ; FLOW
Funding ProjectKey Research and Development Project of Anhui Province, China[201904a05020077] ; Major Program of Anhui Provincial Science and Technology, China[201903a05020044] ; Start-up Fund for Distinguished Scholars in Hefei University[18-19RC15] ; Start-up Fund for Distinguished Scholars in Hefei University[18-19RC16] ; Start-up Fund for Distinguished Scholars in Hefei University[18-19RC19] ; Fund of State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University ; State Key Laboratory of Biochemical Engineering, IPE, CAS
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
Funding OrganizationKey Research and Development Project of Anhui Province, China ; Major Program of Anhui Provincial Science and Technology, China ; Start-up Fund for Distinguished Scholars in Hefei University ; Fund of State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University ; State Key Laboratory of Biochemical Engineering, IPE, CAS
WOS IDWOS:000660216800001
PublisherMARY ANN LIEBERT, INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/49095
Collection中国科学院过程工程研究所
Corresponding AuthorXu, Nong; Dong, Qiang
Affiliation1.Hefei Univ, Sch Energy Mat & Chem Engn, Hefei 230601, Peoples R China
2.Tsinghua Univ, Environm Sch, State Key Joint Lab Environm Simulat & Pollut Con, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Fan, Long,Xiao, Yao,Liu, Qiao,et al. Sludge Rising and Critical Time Prediction for Denitrification in Secondary Clarifiers: Experimental and Computational Fluid Dynamics Studies[J]. ENVIRONMENTAL ENGINEERING SCIENCE,2021:9.
APA Fan, Long.,Xiao, Yao.,Liu, Qiao.,Xu, Nong.,Dong, Qiang.,...&Ding, Aiqin.(2021).Sludge Rising and Critical Time Prediction for Denitrification in Secondary Clarifiers: Experimental and Computational Fluid Dynamics Studies.ENVIRONMENTAL ENGINEERING SCIENCE,9.
MLA Fan, Long,et al."Sludge Rising and Critical Time Prediction for Denitrification in Secondary Clarifiers: Experimental and Computational Fluid Dynamics Studies".ENVIRONMENTAL ENGINEERING SCIENCE (2021):9.
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