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As the experiment was started, it was observed that all the acid traps were increasing by volume since they started to receive evaporated water from urine drying (Table 3). There was a chance of spilling acid solution out of the bottle that contains acid. Therefore, T-connections were used to install pipes before the acid traps (Figure 1), which could retain a part of water vapor before it entered the acid trap. The pipes with T-connections were installed for all treatments, so that those could be removed every day for collecting condensate from urine drying and then connected back.

Table 3

Summary of additional changes during the experiment

TreatmentChanges occurred during the experiment
repetitionDay-14Day-15Day-22 to 28Day-29Day-31Day-33Days-38 to 40Day-43Day-45Day-48Day-39
T1R1   The experiment was paused that means the system was running but no urine was added to any treatment     All the treatments became moist and urine loading was reduced by 30% for all treatments    
T1R2   Became moist 300 g drying agent was added Urine loading was reduced by 50% No urine applied 100 g drying agent was added   
T2R1        150 g drying agent was added  
T2R2 Be-came moist No urine applied Replaced with new drying agents      
T3R1  Became moist  95 g drying agent was added     50 g drying agent was added 
T3R2  Became moist      
TreatmentChanges occurred during the experiment
repetitionDay-14Day-15Day-22 to 28Day-29Day-31Day-33Days-38 to 40Day-43Day-45Day-48Day-39
T1R1   The experiment was paused that means the system was running but no urine was added to any treatment     All the treatments became moist and urine loading was reduced by 30% for all treatments    
T1R2   Became moist 300 g drying agent was added Urine loading was reduced by 50% No urine applied 100 g drying agent was added   
T2R1        150 g drying agent was added  
T2R2 Be-came moist No urine applied Replaced with new drying agents      
T3R1  Became moist  95 g drying agent was added     50 g drying agent was added 
T3R2  Became moist      

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