After calculating the total amount of TAN + u in fresh urine, dried urine, condensate and acid trap, all the values are put together to make a mass balance of TAN + u in the whole urine drying system (Table 5). Here, we considered fresh urine application as the input of TAN + u, the output includes two parts: one is storage in the dried urine, and the other part is loss from the system, which represents the TAN found in condensate and acid trap.

Table 5

Mass balance of TAN + U in the urine drying system

Output (TAN + u)

Input (TAN + u)StorageLoss
Total outputUnaccounted TAN
StoredLost
Treatmentfresh urine (g)dried urine (g)Condensate (g)Acid trap (g)(storage + loss) (g)Input-output (g)Input-output (%)(%)(%)
T1R1 63.51 40.90 0.17 8.97 50.03 13.48 21.22 64 14
T1R2 49.55 17.03 0.40 20.97 38.40 11.15 22.51 34 43
T2R1 36.46 18.65 0.18 14.15 32.98 3.47 9.53 51 39
T2R2a 25.47 14.42 0.10 8.74 23.27 2.20 8.65 57 35
T3R1 6.22 6.09 0.01 1.01 7.11 −0.89 −14.30 98 16
T3R2 6.89 6.90 0.01 1.19 8.10 −1.21 −17.50 100 17
Output (TAN + u)

Input (TAN + u)StorageLoss
Total outputUnaccounted TAN
StoredLost
Treatmentfresh urine (g)dried urine (g)Condensate (g)Acid trap (g)(storage + loss) (g)Input-output (g)Input-output (%)(%)(%)
T1R1 63.51 40.90 0.17 8.97 50.03 13.48 21.22 64 14
T1R2 49.55 17.03 0.40 20.97 38.40 11.15 22.51 34 43
T2R1 36.46 18.65 0.18 14.15 32.98 3.47 9.53 51 39
T2R2a 25.47 14.42 0.10 8.74 23.27 2.20 8.65 57 35
T3R1 6.22 6.09 0.01 1.01 7.11 −0.89 −14.30 98 16
T3R2 6.89 6.90 0.01 1.19 8.10 −1.21 −17.50 100 17

aT2R2 was replaced with new material after 3rd week.

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