The Valorization of Ammonia in Manure Digestate by Means of Alternative Stripping Reactors

Marco Baldi, Maria Cristina Collivignarelli, Alessandro Abbà and Ilaria Benigna
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Marco Baldi: Department of Chemistry, University of Pavia, viale Taramelli 10, 27100 Pavia, Italy
Maria Cristina Collivignarelli: Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 1, 27100 Pavia, Italy
Alessandro Abbà: Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, 25123 Brescia, Italy
Ilaria Benigna: Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 1, 27100 Pavia, Italy

Sustainability, 2018, vol. 10, issue 9, 1-14

Abstract: The proper recovery of resources such as nitrogen and phosphorus present in the manure from intensive livestock farming is essential in order to allow environmental sustainable zootechny especially in densely populated areas where these activities are historically prevalent. The experiences at full-scale established that the ammonia stripping allows recovery from 35% to 50% of nitrogen depending on the type of substrate treated with anaerobic digestion and on the nitrogen content/form in the digestate. This study focuses on the ammonia stripping on digestate derived from anaerobic digestion of livestock manure and corn silage. Two different full-scale plants are studied including a packed column and an air bubble reactor without filling material with the aim to reduce fouling issues due to the content of suspended solids in digestate. The main results suggest that the use of an air bubble reactor could treat digestate with high concentration of suspended solids. A deeper study based on a two-level factorial experiment highlights that the temperature is an important parameter that influences the ammonia removal yields. Thus, a proper management of available thermal energy is very important.

Keywords: anaerobic digestion; livestock manure; digestate; ammonia recovery; fouling issue (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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