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

  • Environmental Engineering
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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%).

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Correspondence to Si-Kyung Cho.

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Cho, SK., Lee, MK., Kim, DH. et al. Enhanced anaerobic digestion of livestock waste by ultrasonication: A tool for ammonia removal and solubilization. Korean J. Chem. Eng. 31, 619–623 (2014). https://doi.org/10.1007/s11814-013-0284-4

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  • DOI: https://doi.org/10.1007/s11814-013-0284-4

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