文献类型: 外文期刊
作者: Fan, Wei 1 ; Li, Yuhang 1 ; Lyu, Tao 2 ; Yu, Jia'ao 1 ; Chen, Zhen 1 ; Jarvis, Peter 2 ; Huo, Yang 1 ; Xiao, Dan 3 ; Huo, Mingxin 1 ;
作者机构: 1.Northeast Normal Univ, Sch Environm, 2555 Jingyue St, Changchun 130117, Peoples R China
2.Cranfield Univ, Sch Water Energy & Environm, Coll Rd, Cranfield MK430AL, Beds, England
3.Jilin Acad Agr Sci, 1363 Shengtai St, Changchun 130033, Peoples R China
关键词: Bubble dynamics; Gas -liquid transfer; Micro-nanobubble technology; Water and wastewater treatment
期刊名称:WATER RESEARCH ( 影响因子:12.8; 五年影响因子:13.3 )
ISSN: 0043-1354
年卷期: 2023 年 228 卷
页码:
收录情况: SCI
摘要: Bubble aeration has been widely applied in water/wastewater treatment, however its low gas utilization rate results in high energy consumption. Application of micro-nanobubbles (MNB) has emerged as a process with the potential to significantly increase gas utilisation due to their high relative surface area and high gas-liquid mass transfer efficiency. In this study, we demonstrate through calibrated models that MNB of an optimum bubble size can shrink and burst at or below the water surface enabling (1) all encapsulated gas to thoroughly dissolve in water, and (2) the bursting of nanobubbles to potentially generate free radicals. Through the understanding of MNB dimensional characteristics and bubble behaviour in water, a dynamic model that integrated force balance (i.e. buoyancy force, gravity, drag force, Basset force and virtual mass force), and mass transfer was developed to describe the rising velocity and radius variation of MNB along its upward trajectory. Unlike for conventional millimetre-sized bubbles, intensive gas dissolution of MNBs led to radius reduction for small bubbles, while a large initial radius triggers bubble swelling. The initial water depth was also crucial, where greater depth could drive the potential for bubble shrinkage so that they were more liable to contract. For example, the optimum bubble size of air (42-194 mu m) and oxygen (127-470 mu m) MNB that could achieve complete gas transfer (100% gas utilisation) for a range of specific water depths (0.5-10 m) were calculated. The modelling results for microbubbles (10-530 mu m) were well validated by the experimental data (R2>0.85). However, the validation of the modelling results for nanobubble (<1 mu m) aeration requires further study due to a lack of available empirical data. In this study, the proposed model and analysis provided new insights into understanding bubble dynamics in water and offered fundamental guidance for practitioners looking to upgrade bubble aeration system.
- 相关文献
作者其他论文 更多>>
-
Effects of Continuous Manure Application on the Microbial Community and Labile Organic Carbon Fractions
作者:Yan, Han;Wu, Jinggui;Fan, Wei
关键词:Mollisols; manure; organic carbon; soil microbial diversity
-
Threshold Recognition of Water Turbidity for Clogging Prevention during Groundwater Recharge Using Secondary Effluent from Wastewater Treatment Plant
作者:Li, Shiwei;Zou, Shubin;Fan, Wei;Wang, Siyue;Xiao, Dan;Wang, Yang
关键词:artificial groundwater recharge; physical clogging; secondary effluent; suspended particles; turbidity; threshold
-
Temporal and Spatial Distribution of Residual Film in Soil Profile under Continuous Film Mulching
作者:Yang, Xiaoting;Fan, Wei;Wu, Jinggui;Yang, Xiaoting;Lv, Yan;Fan, Wei;Cai, Hongguang;Zhu, Wenyue
关键词:plastic pollution; farmland soil; residual film; distribution characteristics; mulch cycle
-
Effects of Straw Maize on the Bacterial Community and Carbon Stability at Different Soil Depths
作者:Fan, Wei;Wu, Jinggui;Fan, Wei;Yuan, Jingchao;Cai, Hongguang
关键词:straw amendment; protected C; soil depths; soil bacterial community
-
Tracking Cryptosporidium in urban wastewater treatment plants in a cold region: Occurrence, species and infectivity
作者:Xiao, Dan;Xiao, Dan;Lyu, Zhaofeng;Chen, Shiheng;Huo, Yang;Fan, Wei;Huo, Mingxin
关键词:WWTPs; Cryptosporidium; Occurrence; Species; Infectivity; Low temperature
-
Reclamation of ginseng residues using two-stage fermentation and evaluation of their beneficial effects as dietary feed supplements for piglets
作者:Xiao, Dan;Shao, Hongze;Huo, Yang;Ogunniran, Blessing Ifeoluwa;Fan, Wei;Huo, Mingxin;Nugroho, Wahyunanto Agung
关键词:Ginseng residue; Bioconversion; Dietary supplementation; Piglet; Beneficial effects
-
Numerical Modeling of COD Transportation in Liaodong Bay: Impact of COD Loads from Rivers Flowing into the Sea
作者:Yu, Hexin;Chen, Zhen;Fan, Wei;Jin, Ge;Jin, Sheng;Xiao, Dan
关键词:inlet river; Liaodong Bay; hydrodynamic-water quality coupling; pollutant transport; emergency water pollution response