Effect of pH and Gas Flow Rate on Ozone Mass Transfer of Κ-Carrageenan Solution in Bubble Column Reactor

Prasetyaningrum, Aji; Kusumaningtyas, Dyah Arum; Suseno, Purbo; Ratnawati, Ratnawati

doi:10.14710/reaktor.18.04.177-182

Cited by 6 publications

(4 citation statements)

References 14 publications

(13 reference statements)

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“…The experimental studies show that the efficiency of the plasma actuator depends on several factors, including air flow velocity V , as well as the parameters of the plasma actuator supply system and the power of the discharges. Many experimental studies confirm that the efficiency of DBD systems decreases with the increase in gas flow velocity (e.g., ozone generators, the concentration of ozone decreases) [ 32 , 33 , 34 ], the same is the case with DBD plasma actuators [ 35 , 36 ] because the operation of the plasma actuator is precisely to generate the plasma “ion wind”.…”

Section: Resultsmentioning

confidence: 97%

Wind Tunnel Testing of Plasma Actuator with Two Mesh Electrodes to Boundary Layer Control at High Angle of Attack

Gnapowski

Pytka

Jóźwik

et al. 2021

Sensors

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The manuscript presents experimental research carried out on the wing model with the SD 7003 profile. A plasma actuator with DBD (Dielectric Barrier Discharge) discharges was placed on the wing surface to control boundary layer. The experimental tests were carried out in the AeroLab wind tunnel where the forces acting on the wing during the tests were measured. The conducted experimental research concerns the analysis of the phenomena that take place on the surface of the wing with the DBD plasma actuator turned off and on. The plasma actuator used during the experimental tests has a different structure compared to the classic plasma actuator. The commonly tested plasma actuator uses solid/impermeable electrodes, while in the research, the plasma actuator uses a new type of electrodes, two mesh electrodes separated by an impermeable Kapton dielectric. The experimental research was carried out for the angle of attack α = 15° and several air velocities V = 5–15 m/s with a step of 5 m/s for the Reynolds number Re = 87,500–262,500. The critical angle of attack at which the SD 7003 profile has the maximum lift coefficient is about 11°; during the experimental research, the angle was 15°. Despite the high angle of attack, it was possible to increase the lift coefficient. The use of a plasma actuator with two mesh electrodes allowed to increase the lift by 5%, even at a high angle of attack. During experimental research used high voltage power supply for powering the DBD plasma actuator in the voltage range from 7.5 to 15 kV.

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Section: Resultsmentioning

confidence: 97%

Wind Tunnel Testing of Plasma Actuator with Two Mesh Electrodes to Boundary Layer Control at High Angle of Attack

Gnapowski

Pytka

Jóźwik

et al. 2021

Sensors

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“…Penelitian relevan mengenai pH terhadap efisiensi gas ozon belum banyak dilakukan. Prasetyaningrum et al 33 melaporkan bahwa peningkatan pH akan meningkatkan konsentrasi ozon terlarut, dan konsentrasi ozon tertinggi dijumpai pada pH 7-8. Telah diketahui pH memengaruhi koefisien tranfer massa ozon dari fase gas ke fase cair.…”

Section: Bahasanunclassified

“…Namun, peningkatan nilai pH di atas 8 akan membuat konsentrasi ozon terlarut semakin menurun. 33 Hal tersebut mendukung penelitian ini yaitu pH 7,2 masih termasuk dalam rentang pH optimal dari gas ozon sehingga memengaruhi paparan gas ozon dalam mem-berikan efek bermakna terhadap penurunan jumlah koloni jamur C. albicans.…”

Section: Bahasanunclassified

Pengaruh Paparan Gas Ozon terhadap Jumlah Koloni Jamur Candida albicans

Chusaeni

Wibisono

Skripsa

2021

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Candida albicans is one of the pathogenic fungal species which causes oral infections. One of the methods to minimize the risk of fungal infection is by application of asepsis procedure through gargling with antiseptics. Ozone has high oxidative properties, therefore, it is considered as an antiseptic agent. Plasma Study Center of Diponegoro University has developed an ozone generator machine which opens up an opportunity to identify ozone properties as an antiseptic in controlling the number of fungal colonies, especially Candida albicans. This study was aimed to identify the effects of ozone exposure on the number of fungal colonies of Candida albicans. This was a laboratory experimental study with one-group pretest-posttest design. A total of 32 samples of Candida albicans suspensions were divided into two groups (16 each). Group 1 was not treated with ozonation, while group 2 were ozonated. Then, the two groups were cultured in SDA media using the spread plate method and were incubated for 48 hours. The data were obtained by calculating the number of fungal colonies growing in SDA media. The Wilcoxon test obtained a p-value <0.05, meaning that there were differences in the colony number of Candida albicans before and after ozonation. In conclusion, ozone exposure has a significant effect on the number of fungal colonies of Candida albicans. Further studies are needed adding variables or parameters. Keywords: ozone; fungal colony; Candida albicans Abstrak: Candida albicans merupakan salah satu spesies jamur patogen yang menyebabkan infeksi oral. Salah satu metode untuk meminimalkan risiko infeksi jamur ialah melalui penerapan prosedur asepsis dengan berkumur menggunakan antiseptik. Ozon memiliki kemampuan oksidasi tinggi sehingga dipertimbangkan untuk menjadi bahan antiseptik. Pusat Penelitian Plasma Universitas Diponegoro telah mengembangkan mesin generator ozon yang membuka peluang untuk mengetahui kemampuan ozon sebagai antiseptik dalam mengendalikan jumlah koloni jamur terutama Candida albicans. Penelitian ini bertujuan untuk mengetahui adanya pengaruh paparan gas ozon terhadap jumlah koloni jamur (Candida albicans). Jenis penelitian ialah eksperimental laboratorik dengan one group pretest-posttest design. Sebanyak 32 sampel suspensi jamur Candida albicans dibagi menjadi dua kelompok (masing-masing 16 sampel). Kelompok 1 tidak dilakukan ozonasi dan kelompok 2 dilakukan ozonasi kemudian kedua kelompok dikultur dalam media SDA dengan metode spread plate dan diinkubasi 48 jam. Data diperoleh dengan menghitung jumlah koloni jamur yang tumbuh pada media SDA. Hasil uji statistik Wilcoxon mendapatkan nilai p<0,05 yang berarti terdapat perbedaan jumlah koloni jamur (Candida albicans) sebelum dan setelah pemberian gas ozon. Simpuolan penelitian ini ialah paparan gas ozon berpengaruh secara bermakna terhadap jumlah koloni jamur (Candida albicans). Penelitian lanjutan diperlukan dengan penambahan variabel atau parameter.Kata kunci: gas ozon; koloni jamur; Candida albicans

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“…The efficient removal of phenolic compounds from industrial wastewater requires a high-performance process with economic feasibility. Different reactor designs have been employed to remove phenol from wastewater, including a semi-batch reactor [28], fluidized bed reactor [29], trickle bed reactor, and bubble column reactor [30][31][32][33].…”

Section: ■ Introductionmentioning

confidence: 99%

Enhancement of Ozonation Reaction for Efficient Removal of Phenol from Wastewater Using a Packed Bubble Column Reactor

2023

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In the ozonation process, the phenol degradation in wastewater undergoes a low mass transfer mechanism. In this study, ozonized packed bubble column reactor was designed and constructed to remove phenol. The reactor’s inner diameter and height were 150 and 8 cm, respectively. The packing height was kept constant at 1 m in accordance with the reactor hydrodynamics. The gas distributor was designed with 55 holes of 0.5 mm. The phenol removal efficiency was evaluated at ozone concentrations of 10, 15, and 20 mg/L, contact times of 15, 30, 45, 60, 75, 90, 105, and 120 min, and phenol concentrations of 3, 6, 9, 12, and 15 mg/L. The results indicated that the highest phenol removal efficiency of 100% was achieved at 30 min in presence of packing. Moreover, the use of packing improved the contact between the gas and liquid, which significantly enhanced the phenol degradation. Actually, a thin film over a packing surface enhances the mass transfer. Also, it was found that the phenol is degraded into CO2 and H2O through a series of reaction steps. Additionally, a kinetic study of a first-order reaction provided an efficient estimation of reaction parameters with a correlation factor of 0.997.

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Effect of pH and Gas Flow Rate on Ozone Mass Transfer of Κ-Carrageenan Solution in Bubble Column Reactor

Cited by 6 publications

References 14 publications

Wind Tunnel Testing of Plasma Actuator with Two Mesh Electrodes to Boundary Layer Control at High Angle of Attack

Wind Tunnel Testing of Plasma Actuator with Two Mesh Electrodes to Boundary Layer Control at High Angle of Attack

Pengaruh Paparan Gas Ozon terhadap Jumlah Koloni Jamur Candida albicans

Enhancement of Ozonation Reaction for Efficient Removal of Phenol from Wastewater Using a Packed Bubble Column Reactor

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