Journal
ENERGIES
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/en12101868
Keywords
slaughterhouse waste; hydrolyzes; pressure; pilot-scale; ammonia; biogas
Categories
Funding
- European Union, European Social Fund
- Ministry of Higher Education, Science and Technology of the Republic of Slovenia
- European Social Fund of the European Union
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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 NH3 removal from diluted slaughterhouse waste at constant air flow of 144 NL/min, temperature 130 degrees C, and at different pressures: 300 kPa, 600 kPa, and 900 kPa. SW was first allowed to hydrolyze for 14 days at 38 degrees 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.
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