Abstract
The treatment of ballast water is indispensable for preventing ecological and economic damage from the spread of invasive species. In this study, a continuous gas bubble reactor (CBR) system was developed for the efficient disinfection of microorganisms in ballast water. Ballast water treatment (BWT) in the CBR was experimentally performed to disinfect Artemia salina in seawater by using 1) pure CO 2 and 2) mixtures with CO 2 , N 2 , and/or SO 2 as a simulated flue gas (CO 2 /N 2 : 20%/80% and CO 2 /N 2 /SO 2 : 19.2%/77.0%/3.8%). The BWT efficiency was improved with an increase in gas flowrate, residence time, gas pressure, and CO 2 concentration in the gas. The toxicity of SO 2 in the CO 2 mixture significantly improved the mortality of microorganisms. Since good dispersion of bubbles and effective contact between bubbles and liquid were important factors in the BWT, a 100% mortality rate of microorganisms could be achieved by controlling the operating conditions in the vertical-type CBR with a counter-current flow between the gas bubbles and seawater. The CO 2 gas distribution, CO 2 solubility, and gas bubble size distribution in the CBR were determined using computational fluid dynamics (CFD) and experimentally confirmed using a high-speed camera. Since excess gas can be recovered from a gas-liquid separator before a ballast tank, the CBR system can be operated without using any toxic or explosive gases in an eco-friendly and energy saving manner.
| Original language | English |
|---|---|
| Pages (from-to) | 316-326 |
| Number of pages | 11 |
| Journal | Water Research |
| Volume | 154 |
| DOIs | |
| Publication status | Published - 2019 May 1 |
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All Science Journal Classification (ASJC) codes
- Ecological Modelling
- Water Science and Technology
- Waste Management and Disposal
- Pollution
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Continuous bubble reactor using carbon dioxide and its mixtures for ballast water treatment. / Baek, Jun Tae; Hong, Jae Hoon; Tayyab, Muhammad; Kim, Doo Wook; Jeon, Pil Rip; Lee, Chang-Ha.
In: Water Research, Vol. 154, 01.05.2019, p. 316-326.Research output: Contribution to journal › Article
TY - JOUR
T1 - Continuous bubble reactor using carbon dioxide and its mixtures for ballast water treatment
AU - Baek, Jun Tae
AU - Hong, Jae Hoon
AU - Tayyab, Muhammad
AU - Kim, Doo Wook
AU - Jeon, Pil Rip
AU - Lee, Chang-Ha
PY - 2019/5/1
Y1 - 2019/5/1
N2 - The treatment of ballast water is indispensable for preventing ecological and economic damage from the spread of invasive species. In this study, a continuous gas bubble reactor (CBR) system was developed for the efficient disinfection of microorganisms in ballast water. Ballast water treatment (BWT) in the CBR was experimentally performed to disinfect Artemia salina in seawater by using 1) pure CO 2 and 2) mixtures with CO 2 , N 2 , and/or SO 2 as a simulated flue gas (CO 2 /N 2 : 20%/80% and CO 2 /N 2 /SO 2 : 19.2%/77.0%/3.8%). The BWT efficiency was improved with an increase in gas flowrate, residence time, gas pressure, and CO 2 concentration in the gas. The toxicity of SO 2 in the CO 2 mixture significantly improved the mortality of microorganisms. Since good dispersion of bubbles and effective contact between bubbles and liquid were important factors in the BWT, a 100% mortality rate of microorganisms could be achieved by controlling the operating conditions in the vertical-type CBR with a counter-current flow between the gas bubbles and seawater. The CO 2 gas distribution, CO 2 solubility, and gas bubble size distribution in the CBR were determined using computational fluid dynamics (CFD) and experimentally confirmed using a high-speed camera. Since excess gas can be recovered from a gas-liquid separator before a ballast tank, the CBR system can be operated without using any toxic or explosive gases in an eco-friendly and energy saving manner.
AB - The treatment of ballast water is indispensable for preventing ecological and economic damage from the spread of invasive species. In this study, a continuous gas bubble reactor (CBR) system was developed for the efficient disinfection of microorganisms in ballast water. Ballast water treatment (BWT) in the CBR was experimentally performed to disinfect Artemia salina in seawater by using 1) pure CO 2 and 2) mixtures with CO 2 , N 2 , and/or SO 2 as a simulated flue gas (CO 2 /N 2 : 20%/80% and CO 2 /N 2 /SO 2 : 19.2%/77.0%/3.8%). The BWT efficiency was improved with an increase in gas flowrate, residence time, gas pressure, and CO 2 concentration in the gas. The toxicity of SO 2 in the CO 2 mixture significantly improved the mortality of microorganisms. Since good dispersion of bubbles and effective contact between bubbles and liquid were important factors in the BWT, a 100% mortality rate of microorganisms could be achieved by controlling the operating conditions in the vertical-type CBR with a counter-current flow between the gas bubbles and seawater. The CO 2 gas distribution, CO 2 solubility, and gas bubble size distribution in the CBR were determined using computational fluid dynamics (CFD) and experimentally confirmed using a high-speed camera. Since excess gas can be recovered from a gas-liquid separator before a ballast tank, the CBR system can be operated without using any toxic or explosive gases in an eco-friendly and energy saving manner.
UR - http://www.scopus.com/inward/record.url?scp=85061909850&partnerID=8YFLogxK
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U2 - 10.1016/j.watres.2019.02.014
DO - 10.1016/j.watres.2019.02.014
M3 - Article
VL - 154
SP - 316
EP - 326
JO - Water Research
JF - Water Research
SN - 0043-1354
ER -