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The average pH of urine (mixed urine from different donors) applied to the system was 6.1 (Table 4). The range of pH of every day urine mixture was 5 to 7.5. Fresh urine samples were collected in different bottles for the first half and the second half of the experiment and total ammonia TAN was measured after enzymatic degradation with urease (TAN + u) and it was 6.84 ± 0.02 g/L and 8.24 ± 0.09 g/L of wet mass of urine (Table 4), respectively. The pH of sieved ash was 12 as measured before the drying experiment.

Table 4

Measured characteristics of collected urine

ParameterValue
Average pH 6.1 (range: 5 to 7.5) 
TAN + u 6.84 ± 0.02 g/L (weeks 1–3.5, 1st half of the experiment) 
8.24 ± 0.09 g/L (weeks 3.5–7, 2nd half of the experiment) 
ParameterValue
Average pH 6.1 (range: 5 to 7.5) 
TAN + u 6.84 ± 0.02 g/L (weeks 1–3.5, 1st half of the experiment) 
8.24 ± 0.09 g/L (weeks 3.5–7, 2nd half of the experiment) 

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