Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

Even thoughdigestate, which is continually generated in anaerobic digestion process, can only be used as fertilizer during the growing season, digestate treatment is still a critical, environmental problem. That is why the present work aims to develop a method to manage digestate in agricultural bio...

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Autores principales:	Aleksandra Chuda, Krzysztof Ziemiński
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	anaerobic digestion biological digestate treatment activated sludge nitrification/denitrification external carbon source COD/N ratio Technology T
Acceso en línea:	https://doaj.org/article/37967d84ff924b21ac3ed2367efe72a4
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spelling	oai:doaj.org-article:37967d84ff924b21ac3ed2367efe72a42021-11-11T16:03:01ZChallenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process10.3390/en142173211996-1073https://doaj.org/article/37967d84ff924b21ac3ed2367efe72a42021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7321https://doaj.org/toc/1996-1073Even thoughdigestate, which is continually generated in anaerobic digestion process, can only be used as fertilizer during the growing season, digestate treatment is still a critical, environmental problem. That is why the present work aims to develop a method to manage digestate in agricultural biogas plant in periods when its use as fertilizer is not possible. A lab-scale system for the biological treatment of the digestate liquid fraction using the activated sludge method with a separate denitrification chamber was constructed and tested. The nitrogen load that was added tothe digestate liquid fraction accounted for 78.53% of the total nitrogen load fed into the reactor. External carbon sources, such as acetic acid, as well as flume water and molasses, i.e., wastewater and by-products from a sugar factory, were used to support the denitrification process. The best results were obtained using an acetic acid and COD (Chemical Oxygen Demand)/NO<sub>3</sub>–N (Nitrate Nitrogen) ratio of 7.5. The removal efficiency of TN (Total Nitrogen), NH<sub>4</sub>–N (Ammonia Nitrogen) and COD was 83.73%, 99.94%, 86.26%, respectively. It was interesting to see results obtained that were similar to those obtained when using flume water and COD/NO<sub>3</sub>–N at a ratio of 8.7. This indicates that flume water can be used as an alternative carbon source to intensify biological nitrogen removal from digestate.Aleksandra ChudaKrzysztof ZiemińskiMDPI AGarticleanaerobic digestionbiological digestate treatmentactivated sludgenitrification/denitrificationexternal carbon sourceCOD/N ratioTechnologyTENEnergies, Vol 14, Iss 7321, p 7321 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	anaerobic digestion biological digestate treatment activated sludge nitrification/denitrification external carbon source COD/N ratio Technology T
spellingShingle	anaerobic digestion biological digestate treatment activated sludge nitrification/denitrification external carbon source COD/N ratio Technology T Aleksandra Chuda Krzysztof Ziemiński Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
description	Even thoughdigestate, which is continually generated in anaerobic digestion process, can only be used as fertilizer during the growing season, digestate treatment is still a critical, environmental problem. That is why the present work aims to develop a method to manage digestate in agricultural biogas plant in periods when its use as fertilizer is not possible. A lab-scale system for the biological treatment of the digestate liquid fraction using the activated sludge method with a separate denitrification chamber was constructed and tested. The nitrogen load that was added tothe digestate liquid fraction accounted for 78.53% of the total nitrogen load fed into the reactor. External carbon sources, such as acetic acid, as well as flume water and molasses, i.e., wastewater and by-products from a sugar factory, were used to support the denitrification process. The best results were obtained using an acetic acid and COD (Chemical Oxygen Demand)/NO<sub>3</sub>–N (Nitrate Nitrogen) ratio of 7.5. The removal efficiency of TN (Total Nitrogen), NH<sub>4</sub>–N (Ammonia Nitrogen) and COD was 83.73%, 99.94%, 86.26%, respectively. It was interesting to see results obtained that were similar to those obtained when using flume water and COD/NO<sub>3</sub>–N at a ratio of 8.7. This indicates that flume water can be used as an alternative carbon source to intensify biological nitrogen removal from digestate.
format	article
author	Aleksandra Chuda Krzysztof Ziemiński
author_facet	Aleksandra Chuda Krzysztof Ziemiński
author_sort	Aleksandra Chuda
title	Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
title_short	Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
title_full	Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
title_fullStr	Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
title_full_unstemmed	Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process
title_sort	challenges in treatment of digestate liquid fraction from biogas plant. performance of nitrogen removal and microbial activity in activated sludge process
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/37967d84ff924b21ac3ed2367efe72a4
work_keys_str_mv	AT aleksandrachuda challengesintreatmentofdigestateliquidfractionfrombiogasplantperformanceofnitrogenremovalandmicrobialactivityinactivatedsludgeprocess AT krzysztofzieminski challengesintreatmentofdigestateliquidfractionfrombiogasplantperformanceofnitrogenremovalandmicrobialactivityinactivatedsludgeprocess
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Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

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