Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater
Underwater plasma has been long recognized as a “green” alternative to conventional chemicals in the wastewater treatment processes. However, practical application of underwater plasma is still challenging due to insufficient treatment performance. Recently, we proposed a novel process named ACAP ut...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-02-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417722000347 |
| _version_ | 1818330480421896192 |
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| author | Yifan Xu Takuya Yamamoto Daiki Hariu Sergey Komarov |
| author_facet | Yifan Xu Takuya Yamamoto Daiki Hariu Sergey Komarov |
| author_sort | Yifan Xu |
| collection | DOAJ |
| description | Underwater plasma has been long recognized as a “green” alternative to conventional chemicals in the wastewater treatment processes. However, practical application of underwater plasma is still challenging due to insufficient treatment performance. Recently, we proposed a novel process named ACAP utilizing acoustic cavitation in order to stabilize the plasma generation and to enlarge the plasma processing region.This work continues our investigation regarding the ACAP treatment process focusing on effects of gas injection. Experiments were performed using an ultrasonic installation equipped with a specially designed sonotrode (Diam. 48 mm) operated at a frequency of 20 kHz and acoustic power of 120 W. The results revealed that the degradation efficiency of Rhodamine B, which was used as a model wastewater pollutant, remains almost unchangeable in the case of air injection, but it is doubled when argon is injected into the ACAP reactor. It was found that the argon injection enhances the degradation efficiency significantly even without ultrasound irradiation. Results of additional measurements suggest that the effect of argon is attributed to its ability to yield high temperature during cavitation, comparatively good solubility in water and a better ability to reduce the breakdown voltage in water compared to the air case. |
| first_indexed | 2024-12-13T13:04:37Z |
| format | Article |
| id | doaj.art-9ccd9194e67f4f54b2ff3e7ba4f94f5d |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-12-13T13:04:37Z |
| publishDate | 2022-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-9ccd9194e67f4f54b2ff3e7ba4f94f5d2022-12-21T23:44:52ZengElsevierUltrasonics Sonochemistry1350-41772022-02-0183105941Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewaterYifan Xu0Takuya Yamamoto1Daiki Hariu2Sergey Komarov3Department of Frontier Sciences for Advanced Environment, Tohoku University, 980-8579 Sendai, Japan; Corresponding author.Department of Metallurgy, Tohoku University, 980-8579 Sendai, JapanDepartment of Frontier Sciences for Advanced Environment, Tohoku University, 980-8579 Sendai, JapanDepartment of Metallurgy, Tohoku University, 980-8579 Sendai, JapanUnderwater plasma has been long recognized as a “green” alternative to conventional chemicals in the wastewater treatment processes. However, practical application of underwater plasma is still challenging due to insufficient treatment performance. Recently, we proposed a novel process named ACAP utilizing acoustic cavitation in order to stabilize the plasma generation and to enlarge the plasma processing region.This work continues our investigation regarding the ACAP treatment process focusing on effects of gas injection. Experiments were performed using an ultrasonic installation equipped with a specially designed sonotrode (Diam. 48 mm) operated at a frequency of 20 kHz and acoustic power of 120 W. The results revealed that the degradation efficiency of Rhodamine B, which was used as a model wastewater pollutant, remains almost unchangeable in the case of air injection, but it is doubled when argon is injected into the ACAP reactor. It was found that the argon injection enhances the degradation efficiency significantly even without ultrasound irradiation. Results of additional measurements suggest that the effect of argon is attributed to its ability to yield high temperature during cavitation, comparatively good solubility in water and a better ability to reduce the breakdown voltage in water compared to the air case.http://www.sciencedirect.com/science/article/pii/S1350417722000347Underwater plasmaUltrasound irradiationAcoustic cavitationHigh-voltage pulseGas injectionRhodamine B degradation |
| spellingShingle | Yifan Xu Takuya Yamamoto Daiki Hariu Sergey Komarov Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater Ultrasonics Sonochemistry Underwater plasma Ultrasound irradiation Acoustic cavitation High-voltage pulse Gas injection Rhodamine B degradation |
| title | Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater |
| title_full | Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater |
| title_fullStr | Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater |
| title_full_unstemmed | Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater |
| title_short | Effect of gas injection on cavitation-assisted plasma treatment efficiency of wastewater |
| title_sort | effect of gas injection on cavitation assisted plasma treatment efficiency of wastewater |
| topic | Underwater plasma Ultrasound irradiation Acoustic cavitation High-voltage pulse Gas injection Rhodamine B degradation |
| url | http://www.sciencedirect.com/science/article/pii/S1350417722000347 |
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