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Title Technologies for Environmental Safety Application of Digestate as Biofertilizer
Authors Ablieieva, Iryna Yuriivna  
Berezhna, Iryna Oleksiivna  
Berezhnyi, Dmytrii Mykhailovych  
Enrich Prast, A.
Geletuha, G.
Lutsenko, Serhii Viktorovych
Yanchenko, Ilona Olehivna  
Carraro, G.
ORCID http://orcid.org/0000-0002-2333-0024
http://orcid.org/0000-0001-9606-4241
http://orcid.org/0000-0002-0751-4835
http://orcid.org/0000-0002-7833-5690
Keywords anaerobic residues
digestat
fertilizing
low-carbon society
pollution
renewable energy
Type Article
Date of Issue 2022
URI https://essuir.sumdu.edu.ua/handle/123456789/87839
Publisher MDPI
License Creative Commons Attribution 4.0 International License
Citation Ablieieva I, Berezhna I, Berezhnyi D, et al. Technologies for Environmental Safety Application of Digestate as Biofertilizer. Ecological Engineering & Environmental Technology. 2022;23(3):106-119. doi:10.12912/27197050/147154.
Abstract The purpose of the paper is to determine the environmentally safe and economically feasible technology of biofertilizer production from the digestate including dewatering process. Methodological basis is based on the systematic approach to the determination of factors effected on the distribution of nutrients and pollutants between liquid and solid fractions after digestate separation. The paper analyzes modern technologies aimed at dewatering the digestate and reduction of its volume, showed their effectiveness. These technologies allow expanding the opportunities for commercialization of the digestate, increasing the cost of its transportation and application to the soil instead of complex fertilizers, using some valuable products. The results of the study showed that the ecological quality of the digestate is the highest as well as co-digested thermally pre-treated feedstock is used for solid-liquid separation in centrifuge with polymer addition as post-treatment approach to the flocculation. In order to increase efficiency of biofertilizer application the technological scheme of production process of granular fertilizers from digestate was proposed. Special feature of this scheme is in the use of phosphogypsum binder for the production of organo-mineral fertilizer that contributes phosphogypsum recycling in the waste management system.
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