Department of ICT Integrated Safe Ocean Smart Cities Engineering, Dong-A University, 37 Nakdong-daero Saha-gu, Busan, 49315, Republic of Korea.
Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX, 77843, United States.
J Environ Manage. 2022 Oct 1;319:115704. doi: 10.1016/j.jenvman.2022.115704. Epub 2022 Jul 14.
A novel aerator for enhancing the oxygen transfer rate and efficiency, named multistage vortex aerator (MVA), was developed. It uses vortex flow in repeated stages to increase the gas-liquid interfacial area and to decrease the thickness of the stagnant layer at the interface between the two phases. The basic characteristics of oxygen transfer using this aerator were investigated using the American Society of Civil Engineers standard procedure. The MVA could rapidly transfer oxygen to water to a concentration higher than 40 mg/L in 60 min owing to the effect of high purity oxygen, additional pressure induced by water and gas, and vortex flow dynamics. A gas transfer model was developed for describing the non-steady state operation of the aerator. This model is based on the mass and molar balances of oxygen in gas and water. It could successfully simulate the DO change inside the aerator. This study can help better understand the oxygen transfer mechanism and evaluate the performance of the new aerator at the various temperatures, pressures, and gas compositions found in diverse environmental systems.
开发了一种新型曝气设备，名为多级旋流曝气器（MVA），用于提高氧气转移速率和效率。它利用多级旋流增加气液界面面积，并减少两相之间停滞层的厚度。使用美国土木工程师协会标准程序研究了该曝气器的氧气转移基本特性。由于高纯度氧气、水和气体产生的附加压力以及旋流动力学的影响，MVA 能够在 60 分钟内迅速将氧气转移到水中，使其浓度高于 40mg/L。开发了一个气体传递模型来描述曝气器的非稳态运行。该模型基于氧气在气体和水中的质量和摩尔平衡。它可以成功模拟曝气器内的 DO 变化。本研究有助于更好地理解氧气传递机制，并评估新型曝气器在各种环境系统中遇到的不同温度、压力和气体组成下的性能。
