1
|
Zhu Q, Sun X, Ge S, Yu Y. Insights into the characteristics and mechanism of vacuum drying technology for municipal sludge processing. CHEMOSPHERE 2023; 310:136729. [PMID: 36252900 DOI: 10.1016/j.chemosphere.2022.136729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/15/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
Vacuum drying is an effective approach for sludge treatment and valorization. However, the vacuum drying of sludge has not been industrialized at present. The objective of this study was to elucidate the vacuum drying characteristics of static sludge and crack initiation mechanism. Our results indicate that crusting on the sludge surface under a high vacuum inhibited drying by reducing major cracks at sludge thicknesses of 13.6 and 10.2 mm. The inhibition effect weakened with decreasing sludge thickness. At 6.8 mm, the mean drying rate (VM) was the lowest at 0.08 MPa, while VM decreased with increasing vacuum degree at thicknesses of 13.6 and 10.2 mm. The decrease in drying rate could be attributed to rapid evaporation on the sludge surface under a high vacuum, leading to crusting, which inhibited crack initiation. VM was raised by 67.9-162.2% from 10.2 to 6.8 mm because the suction force of vacuum on water was much higher than the resistance to water diffusion of small isolation piles at 6.8 mm. Additionally, this study provided essential information to improve existing sludge treatment methods.
Collapse
Affiliation(s)
- Qixiang Zhu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, NO. 2 Sipailou, Nanjing, 210096, China.
| | - Xiaofeng Sun
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, NO. 2 Sipailou, Nanjing, 210096, China.
| | - Shifu Ge
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, NO. 2 Sipailou, Nanjing, 210096, China.
| | - Yang Yu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, NO. 2 Sipailou, Nanjing, 210096, China.
| |
Collapse
|
2
|
Hadjout‐Krimat L, Belbahi A, Dahmoune F, Hentabli M, Boudria A, Achat S, Remini H, Oukhmanou‐Bensidhoum S, Spigno G, Madani K. Study of microwave and convective drying kinetics of pea pods (
Pisum sativum
L.): A new modeling approach using support vector regression methods optimized by dragonfly algorithm techniques. J FOOD PROCESS ENG 2022. [DOI: 10.1111/jfpe.14232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lynda Hadjout‐Krimat
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
| | - Amine Belbahi
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
- Department of Microbiology and Biochemistry, Faculty of Sciences University of M'Sila M'Sila Algeria
| | - Farid Dahmoune
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
- Département de Biologie, Faculté des Sciences de la Nature et de la Vie et des Sciences de la Terre Université de Bouira Bouira Algeria
| | - Mohamed Hentabli
- Laboratory of Biomaterials and Transport Phenomena (LBMPT), Faculty of Technology University Yahia Fares of Médéa Médéa Algeria
| | - Asma Boudria
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
| | - Sabiha Achat
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
| | - Hocine Remini
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
- Département de Biologie, Faculté des Sciences de la Nature et de la Vie et des Sciences de la Terre Université de Bouira Bouira Algeria
| | - Sonia Oukhmanou‐Bensidhoum
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
| | - Giorgia Spigno
- DiSTAS—Department for Sustainable Food Process Università Cattolica del Sacro Cuore Piacenza Italy
| | - Khodir Madani
- Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie Université de Bejaia Bejaia Algeria
- Centre de Recherche en Technologies Agro‐alimentaires (CRTAA) Bejaia Algeria
| |
Collapse
|