Effect of pressure on the removal of NH$_3$ from hydrolyzed and pre-fermented slaughterhouse waste for better biomethanization

Zver, Aleš (author), Bernik, Rajko (author), Mihelič, Rok (author)

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.

• Language: English
• Keywords: slaughterhouse waste, hydrolyzes, pressure, pilot-scale, ammonia, biogas
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 11 str.
• Numbering: Vol. 12, iss. 10, art. 1868
• PID: 20.500.12556/RUL-132331
• UDC: 621.31
• ISSN on article: 1996-1073
• DOI: 10.3390/en12101868
• COBISS.SI-ID: 9222777
• Publication date in RUL: 21.10.2021

Record is a part of a journal

• Title: Energies
• Shortened title: Energies
• Publisher: Molecular Diversity Preservation International
• ISSN: 1996-1073
• COBISS.SI-ID: 518046745

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 16.05.2019

Secondary language

• Language: Slovenian
• Keywords: klavniški odpadki, hidroliza, pritisk, amonijak, bioplin

Projects

• Funder: EC - European Commission
• Funding programme: European Social Fund

• Funder: Other - Other funder or multiple funders
• Funding programme: Ministry of Higher Education, Science and Technology of the Republic of Slovenia