Effect of two-stage thermal disintegration on particle size distribution in sewage sludge

• Authors: Anna M. Karczmarek , Jerzy Gaca
• Languages of publication: EN

Abstracts

EN

The effect of two-stage thermal disintegration of sewage sludge on the particle size distribution using laser diffraction method has been studied. The sludge was sampled from municipal sewage treatment plant after each stage of disintegration. The first stage of disintegration known as homogenization proceeds at temperature of 70-90°C and pressure of 3 bar, the second stage called thermal hydrolysis was performed at temperature of 160-170°C and pressure of 6 bar. It was found that the first stage of disintegration has the strongest impact on the reduction of the sludge particle size and changes in chemical properties. The maximum size of the particles from raw sewage before disintegration was 310 μm. After first stage of the process average size of the particles was 250 μm, and during the second stage it was reduced to 226 μm. Sludge disintegration degree (DDCOD) of 59% confirms high effectiveness of the process. We established that the redox potential (Eh) of sludge effluents was changed after each step of the studied process. Furthermore, chemical oxygen demand (COD) increases which leads to the conclusion that resizing of floccules is accompanied by hydrolysis.

Keywords

EN

laser diffraction; particle size distribution; sludge; thermal hydrolysis

• Publisher: De Gruyter Open
• Journal: Polish Journal of Chemical Technology
• Year: 2013
• Volume: 15
• Issue: 3
• Pages: 69-73

Dates

published

1 - 09 - 2013

online

20 - 09 - 2013

Contributors

author

Anna M. Karczmarek

• University of Technology and Life Sciences in Bydgoszcz, Faculty of Technology and Chemical Engineering, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland

author

Jerzy Gaca

• University of Technology and Life Sciences in Bydgoszcz, Faculty of Technology and Chemical Engineering, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland

References

• 1. Appels, L., Baeyens, J., Degreve, J. & Dewil, R. (2008). Principles and potential of the anaerobic digestion of waste- -activated sludge. Progress in Energy and Combustion Science, 34 (6), 755-781. DOI: 10.1016/j.pecs.2008.06.002.[Crossref][WoS]
• 3. Friedrich, E., Friedrich, H., Heinze, W., Jobst, K., Richter, H.J. & Hermel, W. (1993). Progress in characterization of sludge particles. Wat. Sci. Tech., 28 (I), 14S-148. 0273-1223193.
• 4. Olböter, L. & Vogelpohl, A. (1993). Influence of particle size distribution on the dewatering of organic sludges. Wat. Sci. Tech. 28 (1), 149-157. 0273-1223193.
• 5. Neis, U. & Tiehm, A. (1997). Particle size analysis in primary and secondary waste water effluents. Wat. Sci. Tech. 36 (4), 151-158.[Crossref]
• 6. Tiehm, A., Herwig, V. & Neis, U. (1999). Particle size analysis for improved sedimentation and filtration in waste water treatment. Wat. Sci. Tech. 39 (8), 99-106.[Crossref]
• 7. Barth, H.G. & Flippen, R.B. (1995). Particle Size Analysis. Anal. Chem, 67(12), 257-272. Publication Date: June 1995. DOI: 10.1021/ac00108a013.[Crossref]
• 8. Biggs, C.A. & Lant, P.A. (2000). Activated sludge flocculation: on-line determination of floc size and the effect of shear. Wat. Res. 34 (9), 2542-2550.[Crossref]
• 9. Blume, T. & Neis, U. (2004). Improved wastewater disinfection by ultrasonic pre-treatment. Ultrasonics Sonochemistry, 11 (5), 333-336. Available online August 2003. DOI: 10.1016/ S1350-4177(03)00156-1.[Crossref]
• 10. Chaignon, V., Lartiges, B.S., El Samrani, A. & Mustin, C. (2002). Evolution of size distribution and transfer of mineral particles between flocs in activated sludges: an insight into floc exchange dynamics. Wat. Res. 36 (3), 676-84.[Crossref]
• 11. Houghton, J.I., Burgess, J.E. & Stephenson, T. (2002). Off-line particle size analysis of digested sludge. Wat. Res., 36 (18), 4643-7.[Crossref]
• 12. Jung, Y., Ko, H., Jung, B. & Sung, N. (2011). Application of Ultrasonic System for Enhanced Sewage Sludge Disintegration: A Comparative Study of Single- and Dual- Frequency, KSCE Journal of Civil Engineering, 15 (5), 793-797. DOI: 10.1007/s12205-011-0832-6.[WoS][Crossref]
• 13. Tiehm, A., Nickel, K., Zellhorn, M. & Neis, U. (2001). Ultrasonic waste activated sludge disintegration for improving anaerobic stabilization. Wat. Res., 35 (8), 2003-9. Web: www. elsevier.com/locate/watres.[Crossref]
• 14. Huan, L., Yiying, J., Mahar, R.B., Zhiyu, W. & Yongfeng, N. (2009). Effects of ultrasonic disintegration on sludge microbial activity and dewaterability. Journal of Hazardous Materials, 161 (2-3), 1421-6. DOI: 10.1016/j.jhazmat.2008.04.113.[WoS][Crossref]
• 15. DeLaune, R.D. & Reddy, K.R. (2005). Redox potential. Encyclopedia of Soils in the Environment, 366-371. Web: http:// www.sciencedirect.com/science/article/pii/B0123485304002125.
• 16. Wu, J. & He, C. (2010). Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension. Int. J. Environ. Sci. Tech. 7 (1), 37-46. [WoS][Crossref]

Identifiers

DOI

10.2478/pjct-2013-0047