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Budownictwo i Inżynieria Środowiska

Budownictwo i Inżynieria Środowiska
18/15, DOI: 10.7862/rb.2015.18

CONDITIONS FOR EFFECTIVE ULTRASONIC DISINTEGRATION OF ACTIVATED SLUDGE SUSPENSION

Tomasz KAMIZELA, Mariusz KOWALCZYK, Małgorzata WORWĄG

DOI: 10.7862/rb.2015.18

Abstract

Low-frequency and high energy sonication were used in the experiments on ultrasonic disintegration of activated sludge. Selected operational parameters of sonication were monitored and analyzed. The transformation of solids into a dissolved form by application of ultrasounds was analyzed on the base of changes in the concentrations of carbon, nitrogen and phosphorus. The scope of the research included determination of a five-day biochemical oxygen demand and rate constant of decomposition, which parameters indirectly represented the biodegradability of product of activated sludge disintegration. The study showed that the propagation of ultrasonic wave was highly disintegrating factor, generating a product of the characteristics of concentrated organic solution. By sonication of activated sludge the dissolved phase was enriched particularly in significant amounts of nitrogen and phosphorus. These elements could disturb the processes that require additional source of carbon, thus application of sonication for generation of easily available of organic carbon may seem less feasible. It seems more appropriate application of sonication to reduce the excess sludge through sludge disintegration and biological conversion. For optimum ultrasonic disintegration of activated sludge was considered sonication time 1200 s, which corresponded to the acoustic energy 170 kJ and specific energy 36 MJ/kgTS. In view of obtained values of the rate constant of decomposition, it was found that the disintegration of sludge required energy sonication in excess of 22 MJ/kgTS. Determination of potential applications of activated sludge subjected to sonication still requires further investigations that would use system for biological wastewater treatment. This would be the most reliable way to prove the suitability of activated sludge sonication in wastewater treatment technologies.

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References

  1. Bień J., Kamizela T., Kowalczyk M., Mrowiec M.: Possibilities of gravitational and mechanical separation of sonicated activated sludge suspension. Environmental Protection Engineering, 2009, no. 35(2), pp. 67-72.
  2. Carrere H., Dumas C., Battimelli A., Batstone D.J., Delgenes J.P., Steyer J.P., Ferrer I.: Pretreatment methods to improve sludge anaerobic degradability: A review. Journal of Hazardous Materials, no. 183, 2010, pp. 1-15.
  3. Cao X.Q., Chen J., Cao Y.L., Zhu J.Y., Hao X.D.: Experimental study on sludge reduction by ultrasound. Water Science and Technology, no. 54(9), 2006, pp. 87-93.
  4. Feng X., Lei H., Deng J., Yu Q., Li H.: Physical and chemical characteristics of waste activated sludge treated ultrasonically. Chemical Engineering and Processing, no. 48, 2009, pp. 187-194.
  5. Gogate P.R., Kabadi A.M.: A review of applications of cavitation in biochemical engineering/biotechnology. Biochemical Engineering Journal, no. 44, 2009, pp. 60-72.
  6. He J., Wan T., Zhang G., Yang J.: Ultrasonic reduction of excess sludge from activated sludge system: Energy efficiency improvement via operation optimization. Ultrasonics Sonochemistry, no. 18, 2011, pp. 99-103.
  7. Hogan F., Mormede S., Clark P., Crane M.: Ultrasonic sludge treatment for enhanced anaerobic digestion. Water Science & Technology, no. 50(9), 2004, pp. 25-32.
  8. Kidak R., Wilhelm A.M., Delmas H.: Effect of process parameters on the energy requirement in ultrasonical treatment of waste sludge. Chemical Engineering and Processing, no. 48, 2009, pp. 1346-1352.
  9. Pérez-Elvira S., Fdz-Polanco M., Plaza F.I., Garralón G., Fdz-Polanco F.: Ultrasound pre-treatment for anaerobic digestion improvement. Water Science & Technology, no. 60(6), 2009, pp. 1525-1532.
  10. Salsabil M.R., Prorot A., Casellas M., Dagot C.: Pre-treatment of activated sludge: Effect of sonication on aerobic and anaerobic digestibility. Chemical Engineering Journal, no. 148, 2009, pp. 327-335.
  11. Wang F., Lu S., Ji M.: Components of released liquid from ultrasonic waste activated sludge disintegration. Ultrasonics Sonochemistry, no. 13, 2006, pp. 334-338.
  12. Xie B., Liu H., Yan Y.: Improvement of the activity of anaerobic sludge by low-intensity ultrasound. Journal of Environmental Management, 2009, no. 90, 260-264.
  13. Zawieja I., Wolny L., Wolski P.: Influence of excessive sludge conditioning on the efficiency of anaerobic stabilization process and biogas generation. Desalination, no. 222, 2008, pp. 374-381.
  14. Zhang G., Zhang P., Gao J., Chen Y.: Using acoustic cavitation to improve the bio-activity of activated sludge. Bioresource Technology, no. 99, 2008, pp. 1497-1502.
  15. Zhang G., Zhang P., Yang J., Chen Y.: Ultrasonic reduction of excess sludge from the activated sludge system. Journal of Hazardous Materials, no. 145, 2007, pp. 515-519.

About this Article

TITLE:
CONDITIONS FOR EFFECTIVE ULTRASONIC DISINTEGRATION OF ACTIVATED SLUDGE SUSPENSION

AUTHORS:
Tomasz KAMIZELA (1)
Mariusz KOWALCZYK (2)
Małgorzata WORWĄG (3)

AUTHORS AFFILIATIONS:
(1) Czestochowa University of Technology
(2) Czestochowa University of Technology
(3) Czestochowa University of Technology

JOURNAL:
Budownictwo i Inżynieria Środowiska
18/15

KEY WORDS AND PHRASES:
activated sludge, disintegration, sonication

FULL TEXT:
http://doi.prz.edu.pl/pl/pdf/biis/241

DOI:
10.7862/rb.2015.18

URL:
http://dx.doi.org/10.7862/rb.2015.18

RECEIVED:
2014-10-02

COPYRIGHT:
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