Experimental investigation of the thermal and disinfection performances of a novel hydrodynamic cavitation reactor

Xun Sun, Jong Jin Park, Hyun Soo Kim, Seung Ho Lee, Si Jin Seong, Ae Son Om, Joon Yong Yoon

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In the present study, we proposed an effective, efficient, and economical approach to disinfect water using a novel, advanced, rotational hydrodynamic cavitation reactor (HCR). First, analyses of the flow field and cavitation generation mechanism in the HCR were conducted through visualization of the reactor flow field using a high-speed camera. Second, the thermal performance was tested in 20 experiments with various rotational speeds of the rotor (2700, 3000, 3300, and 3600 rpm) and pump pressure settings (0.0, 0.5, 0.7, 1.0, and 1.5 bar gauge pressure). The HCR maximally achieved a heat generation rate of 48.15 MJ/h and thermal efficiency of 82.18%. Then, the disinfection effect was evaluated using water that simulated an effluent containing Escherichia coli (E. coli) for various flow rates (8, 11, and 14 L/min), a pump pressure setting fixed at 0.5 bar, and a rotational speed of 3600 rpm. In addition, an economical assessment of the disinfection processes was performed by considering the measured electric consumption. The thermal effect generated by the HCR was the dominant factor affecting the concentration of E. coli. The HCR achieved a 100% disinfection rate with a 4.3 L/min treatment rate and a cost of US $ 3.019/m3 at the optimal flow rate. The effects of the pressure setting and rotational speed on the performance were discussed in detail. Finally, compared to the recent studies, the treatment rate of the HCR is several hundred times greater than that obtained by the HCRs utilized in those studies, and also has a reasonable cost.

Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalUltrasonics Sonochemistry
Volume49
DOIs
StatePublished - 2018 Dec

Fingerprint

Disinfection
Hydrodynamics
cavitation flow
Cavitation
Hot Temperature
hydrodynamics
reactors
Pressure
Escherichia
Escherichia coli
Flow fields
flow distribution
flow velocity
Costs and Cost Analysis
Flow rate
Pumps
Process Assessment (Health Care)
pumps
Water
costs

Keywords

  • Economy
  • Escherichia coli
  • Hydrodynamic cavitation
  • Thermal performance
  • Treatment rate
  • Water disinfection

Cite this

Sun, Xun ; Park, Jong Jin ; Kim, Hyun Soo ; Lee, Seung Ho ; Seong, Si Jin ; Om, Ae Son ; Yoon, Joon Yong. / Experimental investigation of the thermal and disinfection performances of a novel hydrodynamic cavitation reactor. In: Ultrasonics Sonochemistry. 2018 ; Vol. 49. pp. 13-23.
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Experimental investigation of the thermal and disinfection performances of a novel hydrodynamic cavitation reactor. / Sun, Xun; Park, Jong Jin; Kim, Hyun Soo; Lee, Seung Ho; Seong, Si Jin; Om, Ae Son; Yoon, Joon Yong.

In: Ultrasonics Sonochemistry, Vol. 49, 12.2018, p. 13-23.

Research output: Contribution to journalArticle

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T1 - Experimental investigation of the thermal and disinfection performances of a novel hydrodynamic cavitation reactor

AU - Sun, Xun

AU - Park, Jong Jin

AU - Kim, Hyun Soo

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AU - Seong, Si Jin

AU - Om, Ae Son

AU - Yoon, Joon Yong

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AB - In the present study, we proposed an effective, efficient, and economical approach to disinfect water using a novel, advanced, rotational hydrodynamic cavitation reactor (HCR). First, analyses of the flow field and cavitation generation mechanism in the HCR were conducted through visualization of the reactor flow field using a high-speed camera. Second, the thermal performance was tested in 20 experiments with various rotational speeds of the rotor (2700, 3000, 3300, and 3600 rpm) and pump pressure settings (0.0, 0.5, 0.7, 1.0, and 1.5 bar gauge pressure). The HCR maximally achieved a heat generation rate of 48.15 MJ/h and thermal efficiency of 82.18%. Then, the disinfection effect was evaluated using water that simulated an effluent containing Escherichia coli (E. coli) for various flow rates (8, 11, and 14 L/min), a pump pressure setting fixed at 0.5 bar, and a rotational speed of 3600 rpm. In addition, an economical assessment of the disinfection processes was performed by considering the measured electric consumption. The thermal effect generated by the HCR was the dominant factor affecting the concentration of E. coli. The HCR achieved a 100% disinfection rate with a 4.3 L/min treatment rate and a cost of US $ 3.019/m3 at the optimal flow rate. The effects of the pressure setting and rotational speed on the performance were discussed in detail. Finally, compared to the recent studies, the treatment rate of the HCR is several hundred times greater than that obtained by the HCRs utilized in those studies, and also has a reasonable cost.

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