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 Technoljournal_title
Bioresource technologyauthors
Awiszus S,Meissner K,Reyer S,Müller Jdoi
10.1016/j.biortech.2017.09.099subject
Has Abstractpub_date
2018-01-01 00:00:00pages
419-425eissn
0960-8524issn
1873-2976pii
S0960-8524(17)31664-4journal_volume
247pub_type
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