Novel approach to ammonia recovery from anaerobic digestion via side-stream stripping at multiple pH levels.

Autor: Palakodeti A; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium. Electronic address: advait.palakodeti@kuleuven.be., Rupani PF; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium. Electronic address: parveenfatemeh.rupani@kuleuven.be., Azman S; Avans University of Applied Sciences, Academy of Life Sciences and Technology, Lovensdijkstraat 61, 4818 AJ, Breda, Netherlands., Dewil R; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium; University of Oxford, Department of Engineering Science, Parks Road, Oxford OX1 3PJ, United Kingdom. Electronic address: raf.dewil@kuleuven.be., Appels L; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium. Electronic address: lise.appels@kuleuven.be.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2022 Oct; Vol. 361, pp. 127685. Date of Electronic Publication: 2022 Jul 22.
DOI: 10.1016/j.biortech.2022.127685
Abstrakt: Ammonia recovery from anaerobic digesters via side-stream stripping is a technique to recover nitrogen from manure wastes. This study demonstrated a novel approach to determining ammonia recovery to maintain total ammonia concentrations in the digester in the range of 1.7-2.1 gN/L. Increasing the pH during stripping from 8, 8.5 to 9.5 did not affect the stability of the digester. Methane yields of 60-80 mL/(gVS.d) and volatile fatty acid concentrations of 0-500 mg/L were reported throughout its operation. The low solubilisation increase upon recirculation of the digestate explained the lack of change in methane yields due to side-stream stripping. Increasing the pH during stripping also did not affect the digester's operating pH, which was attributed to the neutralising effect of biogas as stripping gas. Therefore, total ammonia concentrations in the digester can be controlled by determining the extent of ammonia recovery, and the pH during stripping can be increased without compromising the digester's stability.
(Copyright © 2022. Published by Elsevier Ltd.)
Databáze: MEDLINE
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