Changes in the Composition of Digestate Liquid Fraction after Ozone and Ultrasonic Post-Treatment

Aleksandra Chuda (), Konrad Jastrząbek and Krzysztof Ziemiński
Additional contact information
Aleksandra Chuda: Department of Environmental Biotechnology, Lodz University of Technology, Wolczanska 171/173 Street, 90-530 Lodz, Poland
Konrad Jastrząbek: Institute of Natural Products and Cosmetics, Lodz University of Technology, Stefanowskiego 2/22 Street, 90-537 Lodz, Poland
Krzysztof Ziemiński: Department of Environmental Biotechnology, Lodz University of Technology, Wolczanska 171/173 Street, 90-530 Lodz, Poland

Energies, 2022, vol. 15, issue 23, 1-15

Abstract: There is a growing concern about environmental pollution with digestate, which is produced in significant amounts in the anaerobic digestion process. The inappropriate application of digestate in agriculture may lead to ammonia emission to the atmosphere, nutrients infiltration to groundwater and surface waters eutrophication. There is a great interest in the development of efficient downstream technologies that will help better handle digestate. This study assessed the effect of three different disintegration methods (ozonation, ultrasonication, combination of ozonation and ultrasound) on solids content, nutrient concentration and biodegradability of the liquid fraction of sugar beet pulp digestate. The influence of initial pH (7, 8, 9), ozone dose (0.05–0.45 g O 3 /g TS), specific ultrasound energy (10,381–51,903 kJ/kg TS) and vibration amplitude (50, 100%) on the performance of digestate liquid fraction treatment was investigated. The highest removal efficiencies of organic substances, total and ammonia nitrogen averaging at 13.81, 20.04 and 28.70%, respectively, in separate ozonation and ultrasonication processes, was obtained at ozone dose of 0.25 g O 3 /g TS, specific energy of 41,522 kJ/kg TS and amplitude of 100%. The application of combined processes, first ultrasonication and then ozonation, resulted in an increase in the above-mentioned removal efficiencies to 58.16, 36.60 and 48.71%, respectively.

Keywords: ozone; ultrasound; anaerobic digestion; digestate; post-treatment; digestate disintegration; solubilization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/23/9183/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/23/9183/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:23:p:9183-:d:992852

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().