Abstract The recycle of the wastewater is one of the main factors for realizing a higher closure degree of bioregenerative life support system (BLSS), among which the treatment and recovery of the crew's urine are the most difficult and critical issues. Researchers have paid a lot of attention on the desalination of urine in the previous studies, however, if the nitrogen could be recycled simultaneously while desalting the urine, the substance circulation and the closure of BLSS could be improved more significantly. In this study, two-step method was conducted to treat the urine and recycle the water and nitrogen. The urine was hydrolyzed firstly, and then the water vapor and ammonia gas were cooled and collected by using reduced pressure distillation in alkaline condition. High temperature acidification method (HTAM) and immobilized urease catalysis method (IUCM) were investigated in the hydrolysis pretreatment of urine. The treatment conditions of both methods were optimized and the hydrolysis efficiencies were compared. The results showed that the optimum treatment temperature and acidity for HTAM were 99°C and [H+] =2mol/L when the reaction time was 7h, and the maximum nitrogen recycle efficiency was 39.7%. While, the optimum treatment conditions for IUCM were 60°C, pH=7.0 and 40min, and the maximum nitrogen recycle efficiency could reach 52.2%. Therefore, compared with HTAM, IUCM has higher hydrolysis efficiency with milder reaction temperature and pH and shorter reaction time which means it could adapt to the heavy urine treatment workload in BLSS. This investigation has provided a promising method to recycle the urine in BLSS, and all the results will contribute to the further BLSS experiments conducted in the stage II of the “Lunar Palace 1”.
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Highlights Both the HTAM and IUCM could improve the nitrogen recycle efficiency. The optimal pretreatment conditions for HTAM could be 99°C, 7h and [H+]=2mol/L. The optimal pretreatment conditions for IUCM could be 60°C, 40min and pH=7. IUCM is more efficient than HTAM to treat the urine in BLSS. Water recycle efficiency could reach 100% and desalination efficiency was 92.59%.
The recycle of water and nitrogen from urine in bioregenerative life support system
Acta Astronautica ; 123 ; 86-90
2016-03-10
5 pages
Article (Journal)
Electronic Resource
English
BLSS , bioregenerative life support system , HTAM , high temperature acidification method , IUCM , immobilized urease catalysis method , TN , total nitrogen , UHE , urine hydrolysis efficiency , T , temperature , RT , reaction time , Urine treatment , Nitrogen recycle , High temperature acidification , Immobilized urease
The recycle of water and nitrogen from urine in bioregenerative life support system
Online Contents | 2016
|Bioregenerative Life Support System Design
SAE Technical Papers | 1995
|Bioregenerative life-support systems
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