Thermophilic condition favors ammonia production during dry anaerobic digestion.
Ammonia production has strongly negative linear relationship with manure's TS.
First-order kinetic models well fit the dry ammonia fermentation process.
65% of organic-N conversion was achieved under optimal 8 days' dry AD conditions.
> 90% of TAN in swine manure was recovered by dry AD and stripping at 20% TS.