Enhanced anaerobic digestion of livestock waste by ultrasonication: A tool for ammonia removal and solubilization

Title
Enhanced anaerobic digestion of livestock waste by ultrasonication: A tool for ammonia removal and solubilization
Authors
조시경이모권김동훈윤여명정경원신항식오세은
Keywords
Ammonia inhibition; Ultrasonication; Stable bubble; Livestock wastewater; Anaerobic digestion
Issue Date
2014-04
Publisher
The Korean journal of chemical engineering
Citation
VOL 31, NO 4, 619-623
Abstract
Ultrasonication was applied to lower the ammonia level in livestock waste to enhance the anaerobic digestion performance. In simulated waste tests, in spite of an identical temperature increase, a higher ammonia removal rate was observed at lower frequency. This could be explained by the existence of athermal effects, accounting for 64% of the total ammonia removal rate. These effects originated from various convections (micro-streaming, micro-convection, shock-waves, and micro-jets), possibly caused by stable bubbles, and this indigenous mixing ability led to a negligible effect of aeration in the ultrasound assisted ammonia stripping process. In actual waste tests, an ammonia removal rate of up to 55% was achieved with a 0.77 h−1 mass transfer rate coefficient. After ultrasonication (28 kHz, pH 11, 15 min) of livestock waste, 58% higher CH4 yield was achieved due to the decrease of ammonia concentration (28%) and enhanced solubilization (51%).
URI
http://pubs.kist.re.kr/handle/201004/49566
ISSN
02561115
Appears in Collections:
KIST Publication > Article
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