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Effect of Pressure on the Removal of NH 3 from Hydrolyzed and Pre-Fermented Slaughterhouse Waste for Better Biomethanization

Author

Listed:
  • Aleš Zver

    (KG Lendava d.d., Glavna ulica 115, 9220 Lendava, Slovenia)

  • Rajko Bernik

    (Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia)

  • Rok Mihelič

    (Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia)

Abstract

Slaughterhouse waste (SW) is potentially a good source of biomethane; however, its excessive ammonia content quickly causes inhibition of microbial processes. Our aim was therefore to remove ammonia from SW before putting it into a biogas reactor. Experimental 120 L pressure container was constructed to observe NH 3 removal from diluted slaughterhouse waste at constant air flow of 144 NL/min, temperature 130 °C, and at different pressures: 300 kPa, 600 kPa, and 900 kPa. SW was first allowed to hydrolyze for 14 days at 38 °C. The SW was diluted with water (DSW) to 8.4% dry matter (DM) and forcibly aerated for 334 min. From the DSW, 0.7%, 3.8%, and 9% of initial total N were removed at 300 kPa, 600 kPa, and 900 kPa, respectively. However, the C/N ratio changed only slightly, from the initial 4.38 to 3.17, which is not a promising result for biomethanization. Further research on the presented system with the addition of bases might be promising to remove more ammonia.

Suggested Citation

  • Aleš Zver & Rajko Bernik & Rok Mihelič, 2019. "Effect of Pressure on the Removal of NH 3 from Hydrolyzed and Pre-Fermented Slaughterhouse Waste for Better Biomethanization," Energies, MDPI, vol. 12(10), pages 1-11, May.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1868-:d:231732
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