Continuous bubble reactor using carbon dioxide and its mixtures for ballast water treatment

Jun Tae Baek, Jae Hoon Hong, Muhammad Tayyab, Doo Wook Kim, Pil Rip Jeon, Chang-Ha Lee

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)316-326
Number of pages11
JournalWater Research
Volume154
DOIs
Publication statusPublished - 2019 May 1

Fingerprint

ballast water
Water treatment
bubble
water treatment
Carbon dioxide
carbon dioxide
Gases
gas
Microorganisms
microorganism
reactor
Bubbles (in fluids)
Seawater
Ballast tanks
seawater
mortality
liquid
Disinfection
High speed cameras
countercurrent

All Science Journal Classification (ASJC) codes

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

Cite this

Baek, Jun Tae ; Hong, Jae Hoon ; Tayyab, Muhammad ; Kim, Doo Wook ; Jeon, Pil Rip ; Lee, Chang-Ha. / Continuous bubble reactor using carbon dioxide and its mixtures for ballast water treatment. In: Water Research. 2019 ; Vol. 154. pp. 316-326.
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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 journalArticle

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