Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Enhancement of OH Radical Generation of Dielectric Barrier Discharge Plasma Gas Using Air-automizing Nozzle

이류체 노즐을 이용한 유전체장벽방전 플라즈마 가스의 OH 라디칼 생성 향상

  • Park, Young-Seek (Division of Creative Integrater General Studies, Daegu University)
  • Received : 2018.02.20
  • Accepted : 2018.05.09
  • Published : 2018.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Many chemically active species such as ${\cdot}H$, ${\cdot}OH$, $O_3$, $H_2O_2$, hydrated $e^-$, as well as ultraviolet rays, are produced by Dielectric Barrier Discharge (DBD) plasma in water and are widely use to remove non-biodegradable materials and deactivate microorganisms. As the plasma gas containing chemically active species that is generated from the plasma reaction has a short lifetime and low solubility in water, increasing the dissolution rate of this gas is an important challenge. To this end, the plasma gas and water within reactor were mixed using the air-automizing nozzle, and then, water-gas mixture was injected into water. The dissolving effect of plasma gas was indirectly confirmed by measuring the RNO (N-Dimethyl-4-nitrosoaniline, indicator of the formation of OH radical) solution. The plasma system consisted of an oxygen generator, a high-voltage power supply, a plasma generator and a liquid-gas mixing reactor. Experiments were conducted to examine the effects of location of air-automizing nozzle, flow rate of plasma gas, water circulation rate, and high-voltage on RNO degradation. The experimental results showed that the RNO removal efficiency of the air-automizing nozzle is 29.8% higher than the conventional diffuser. The nozzle position from water surface was not considered to be a major factor in the design and operation of the plasma reactor. The plasma gas flow rate and water circulation rate with the highest RNO removal rate were 3.5 L/min and 1.5 L/min, respectively. The ratio of the plasma gas flow rate to the water circulation rate for obtaining an RNO removal rate of over 95% was 1.67 ~ 4.00.

Keywords

References

  1. Deng, S., Ruan, R., Mok, C., Huang, G., Lin, X., Chen, P., 2007, Inactivation of Escherichia coli on almonds using nonthermal plasma,. J. of Food Sci., 72, M62-M65. https://doi.org/10.1111/j.1750-3841.2007.00275.x
  2. Jee, S. I., Won, C. H., Lee, H. J., Lee, K. H., Lee, I. H., Kim, H. W., 2016, Effect of pH change on properties of treated water in sewage treatment by nonthermal plasma method, J. of Kor. Soc. Env. Tech., 17(6), 501-510.
  3. Jiang, B., Zheng, J., Qiu, S., Wu, M., Zhang, Q., Yan, Z., Xue, Q., 2014, Review on electrical discharge plasma technology for wastewater remediation, Chem. Eng. J. 236, 348-368. https://doi.org/10.1016/j.cej.2013.09.090
  4. Ke, Z., Huang, Q., Zhang, H., Yu, Z., 2011, Reduction and removal of aqueous Cr(VI) byglow discharge plasma at the gasesolution interface, Environ. Sci. Technol., 45, 7841-7847. https://doi.org/10.1021/es201680m
  5. Kim, D. S., Park, Y. S., 2011, A Basic study of plasma reactor of dielectric barrier discharge for the water treatment, J. of Environ. Sci. 20(5), 623-630.
  6. Kim, D. S., Park, Y. S., 2013, A Study for oxidants generation on oxygen-plasma discharging process discharging system, J. of Environ. Sci. Int., 22(12), 1561-1569. https://doi.org/10.5322/JESI.2013.22.12.1561
  7. Kim, D. S., Park, Y. S., 2014, Improvement of OH radical generation in plasma reactor using homogenizer, 2014 Annual Conference Kor. Environ. Sci. Soc., 23, 344-348.
  8. Kim, D. S., Park, Y. S., 2014, Improvement of OH radical generation in plasma reactor using homogenizer, Proceeding of 2014 Regular Conference, Kor. Environ. Sci. Soc., 23, 344-348.
  9. Lee, W. T., 2009, Ozonation technology, http://attfile.konetic.or.kr/konetic/uploaded_data/MARKET_FOREIGN/TBL_FOREIGN_HO_20110225PM122356.pdf.
  10. Mok, C. K., Song, D. M., 2013, Low-pressure discharge plasma inactivation of Salmonella typhymurium and sanitation of egg, Food Eng. Prog., 17(3), 245-250. https://doi.org/10.13050/foodengprog.2013.17.3.245
  11. MS nozzle, 2014, http://www.msnozzle.co.kr/product.php?cat=011004.
  12. Park, Y. S., 2014, Improvement of gas dissolution rate in a plasma reactor by using the air atomizing nozzle, Proceeding of 2014 Regular Conference, Kor. Environ. Sci. Soc., 23, 354-358.
  13. Park, Y. S., 2017, Performance improvement of gas-liquid mixed plasma discharge system using high speed agitation, J. of Environ. Sci. Int., 26(6), 711-717. https://doi.org/10.5322/JESI.2017.26.6.711
  14. Shi, J., Bian, W., Yin, X., 2009, Organic contaminants removal by the technique of pulsed high-voltage discharge in water, J. Hazard. Mater., 171, 924-931. https://doi.org/10.1016/j.jhazmat.2009.06.134
  15. Water Encyclopedia, 2016, Ozone, http://www.water.or.kr
  16. Zhang, C., Sun, Y., Yu, Z., Zhang, G., Feng, J., 2018, Simultaneous removal of Cr(VI) and acid orange 7 from water solution by dielectric barrier discharge plasma, Chemosphere, 191, 527-536. https://doi.org/10.1016/j.chemosphere.2017.10.087