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Influence of NH₃ and NH₄⁺ on anaerobic digestion and microbial population structure at increasing total ammonia nitrogen concentrations

Title data

Mlinar, Stanislava ; Weig, Alfons ; Freitag, Ruth:
Influence of NH₃ and NH₄⁺ on anaerobic digestion and microbial population structure at increasing total ammonia nitrogen concentrations.
In: Bioresource Technology. (2022) . - No. 127638.
ISSN 1873-2976
DOI: https://doi.org/10.1016/j.biortech.2022.127638

Abstract in another language

Despite the extensive research dedicated to ammonia inhibition, the effect of NH3 and NH4+ on each anaerobic digestion stage and the associated microorganisms is still not completely understood. In the past, the focus was mainly on methanogenesis and either on NH3 or total ammonia nitrogen (TAN). Here, anaerobic digestion of two defined substrates, namely starch/NH4Cl and casein, was investigated particularly regarding the effects of different NH3/NH4+ ratios on the involved microorganisms. TAN affected bacteria, primarily gram-positive ones, whereas archaea responded largely to the NH3 concentration. These sensitivity differences are attributed to differences in the corresponding cell-membrane structures. A TAN decrease via stripping performed in two full-scale agricultural biogas plants resulted in increased bacterial diversity, with a pronounced increase in the propionate acetogens’ abundance. Based on these data, it is suggested that inhibition can be avoided and processes stabilized in biogas plants by adjusting the NH3/NH4+ ratio, when feeding nitrogen-rich substrates.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Engineering Science > Chair Process Biotechnology
Faculties > Faculty of Engineering Science > Chair Process Biotechnology > Chair Process Biotechnology - Univ.-Prof. Dr. Ruth Freitag
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
500 Science > 570 Life sciences, biology
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 19 Jul 2022 07:02
Last Modified: 19 Jul 2022 07:02
URI: https://eref.uni-bayreuth.de/id/eprint/70616