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A pilot test was carried out with only water in the drying box (without any drying agent and urine added) to quantify the drying capacity of the system. The amount of water evaporated per day from each treatment was measured (Table 1) and considered as the urine drying capacity of the system with specific temperature and airflow.

Table 1

Estimated daily urine loading rate in different treatments

TreatmentTemperature of moisture control box (°C)Temperature of drying box (°C)Airflow (L/min)Rate of water loss (L/m2, day)Total water loss from the drying box (ml/day)80% of average daily water loss (ml)Total urine load in a week (ml)Urine load (when applied 5 days/week) (ml/day)
T-1 35 60 6.20 223 179 1,250 250 
T-2 35 60 3.40 124 99 695 140 
T-3 35 35 0.64 23 19 130 26 
T-4 20 20 0.20 
TreatmentTemperature of moisture control box (°C)Temperature of drying box (°C)Airflow (L/min)Rate of water loss (L/m2, day)Total water loss from the drying box (ml/day)80% of average daily water loss (ml)Total urine load in a week (ml)Urine load (when applied 5 days/week) (ml/day)
T-1 35 60 6.20 223 179 1,250 250 
T-2 35 60 3.40 124 99 695 140 
T-3 35 35 0.64 23 19 130 26 
T-4 20 20 0.20 

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