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

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 183.3mg·m-3 was detected during drying. A NH3 concentration of 10.8mg·m-3 was measured in the exhaust air of the ammonia scrubber, which is equal to a NH3 reduction rate of 94%.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Awiszus S,Meissner K,Reyer S,Müller J

doi

10.1016/j.biortech.2017.09.099

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

419-425

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(17)31664-4

journal_volume

247

pub_type

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