Abstract
Abstract The effect of total ammonia nitrogen (TAN) transfer to nitrate via the nitrification process on the nitrogen loss during long-term storage of liquid phase of digestate (LPD) was verified. The treatments simulating summer (25 ±2 ° C) and winter (10 ±0.5 ° C) conditions were evaluated in addition to the influence of the stirring. The experiments proved that intensive nitrogen losses could be connected with the storage of raw LPD. Up to 87% of TAN was lost within 100 days and stirring led to a 96% increase in loss. Nitrogen loss observed during the storage of nitrified LPD did not exceed 6% even after 250 days where the stirring had no effect on the results. For raw and nitrified LPD, temperature had no significant influence on nitrogen loss.
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