Ammonia and methane emissions during drying of dewatered biogas digestate in a two-belt conveyor dryer

Publikations-Art: Zeitschriftenbeitrag (peer-reviewed)
Autoren: Awiszus, S; Meissner, K; Reyer, S; Müller, J
Erscheinungsjahr: 2017
Veröffentlicht in: Bioresource Technology
Herausgeber: Elsevier
DOI: org/10.1016/j.biortech.2017.09.099
Schlagworte: Ammonia scrubber, digesta, drying, Fourier transform infrared spectroscopy, greenhouse gas emission

Abstract

Aim of the present study was to identify type and amount of emissions during the drying of biogas digestate in a two-belt conveyor dryer at different temperature settings and to investigate the effect on its nutrient content. Furthermore, the possibility of recovering nitrogen from the exhaust air was investigated. Emissions of CH₄, CO₂ and NH₃ were measured by Fourier transform infrared spectroscopy. Biogas is mainly composed of CH₄ and CO₂, hence gas release from the digestate during drying was expected to increase the concentration of these components. Although CO₂ concentration was elevated above the background concentration, CH₄ did not exceed the background concentration. Maximum NH₃ concentration of 183.3 mg m^-3 was detected during drying. A NH₃ concentration of 10.8 mg·m^-3 was measured in the exhaust air of the ammonia scrubber, which is equal to a NH₃ reduction rate of 94%.

Beteiligte Personen

Beteiligte Einrichtungen

Projekte im Rahmen der Publikation

Ganzheitliche Optimierung der Biogasprozesskette zur Steigerung der betrieblichen, stofflichen, energetischen und ökologischen Effizienz unter besonderer Berücksichtigung der Produktion eines natürlichen kundenspezifischen Düngemittels (GOBi)