Exposure of the static magnetic fields on the microbial growth rate and the sludge properties in the complete-mix activated sludge process (a Lab-scale study)

Microbial Cell Factories

Research

Glen T. Daigger¹  Abdolmotaleb Seid-Mohammadi²  Reza Shokoohi²  Mohammad Reza Samarghandi²  Behrooz Malekolkalami³  Ramin Khoshniyat⁴  Ghorban Asgari⁴ 

[1] Department of Civil and Environmental Engineering, University of Michigan, 177 EWRE Building, 1351 Beal Street, 48109, Ann Arbor, MI, USA;Department of Environmental Health Engineering, School of Public Health, Research Centre for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran;Department of Physics, University of Kurdistan, P.O. Box 66177-15175, Sanandaj, Iran;Social Determinants of Health Research Center (SDHRC), Faculty of Public Health, Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran;

关键词: Activated sludge;    Static magnetic fields;    Aeration reactors;    α-Factor;    Mixed liquor volatile suspended solids;    Bioflocs;   

DOI  :  10.1186/s12934-023-02207-x

 received in 2023-05-24, accepted in 2023-09-19,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundIn this study, the effect of static magnetic fields (SMFs) on improving the performance of activated sludge process to enhance the higher rate of microbial growth biomass and improve sludge settling characteristics in real operation conditions of wastewater treatment plants has been investigated. The effect of SMFs (15 mT), hydraulic retention time, SRT, aeration time on mixed liquor suspended solids (MLSS) concentrations, mixed liquor volatile suspended solids (MLVSS) concentrations, α-factor, and pH in the complete-mix activated sludge (CMAS) process during 30 days of the operation, were evaluated.ResultsThere were not any differences between the concentration of MLSS in the case (2148.8 ± 235.6 mg/L) and control (2260.1 ± 296.0 mg/L) samples, however, the mean concentration of MLVSS in the case (1463.4 ± 419.2 mg/L) was more than the control samples (1244.1 ± 295.5 mg/L). Changes of the concentration of MLVSS over time, follow the first and second-order reaction with and without exposure of SMFs respectively. Moreover, the slope of the line and, the mean of α-factor in the case samples were 6.255 and, − 0.001 higher than the control samples, respectively. Changes in pH in both groups of the reactors were not observed. The size of the sluge flocs (1.28 µm) and, the spectra of amid I' (1440 cm−1) and II' (1650 cm−1) areas related to hydrogenase bond in the case samples were higher than the control samples.ConclusionsSMFs have a potential to being considered as an alternative method to stimulate the microbial growth rate in the aeration reactors and produce bioflocs with the higher density in the second clarifiers.

【 授权许可】

CC BY   
© BioMed Central Ltd., part of Springer Nature 2023

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