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In order to enhance a biogas production by the hydro-thermal pre-treatment of piggery manure, the effects of hydro-thermal reaction temperature at thermal hydrolysis of piggery manure on the methane potential and anaerobic biodegradability of thermal hydrolysate were analyzed. The increase of hydro-thermal reaction temperature from 170°C to 220°C caused the enhancement of hydrolysis efficiency, and most of organic matters were present in soluble forms. However, the methane potentials (B u -TCOD) of hydrolysate were decreased from 0.239 to 0.188 Nm 3 kg -1-TCOD added by increasing hydro-thermal reaction temperature from 170°C to 220°C, and also the anaerobic biodegradability (D TCOD ) decreased from 74.6% to 58.6% with increase of hydro-thermal reaction temperature. The increase of hydro-thermal reaction temperature from 170°C to 220°C resulted in the decrease of easily biodegradable organic matter content, while persistent organic matter contents increased.

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