YANGHao-yuan,DUZi-wen,ZHANGLi-qiu.Performance and Risk of Hydrolyzed Urine for Hydroponic Vegetable Cultivation[J].China Water & Wastewater,2024,40(1):110-115.
Performance and Risk of Hydrolyzed Urine for Hydroponic Vegetable Cultivation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
110-115
Column:
Date of publication:
2024-01-01
- Keywords:
- urine; hydrolysis; hydroponics; fertilization evaluation; risk analysis
- Abstract:
- The recycle and reuse of source-separated urine has drawn great attention around the world recently. However, the previous studies mainly focused on the recovery of nutrients, and there are relatively few studies related to direct utilization of urine. In this study, the effects of urine pretreatment on the growth of hydroponic plants were investigated, and the risk of residual medicine in urine used for hydroponic plant growth was discussed. The addition of urease accelerated the hydrolysis of urine during fermentation. The pH of the hydrolyzed urine rose to approximately 9, and the ammonia nitrogen increased to approximately 8 000 mg/L. The best hydrolysis performance of fresh urine was obtained when the temperature was 50 ℃ and the dosage of urease was 10 mg/L, and the hydrolysis process was completed within 2 days. The hydrolyzed urine used as liquid fertilizer for hydroponic water spinach growth showed good performances. Among them, the performance of fertilizer was the best when the dilution ratio of hydrolyzed urine was 1∶500, and there was little impact on the water environment. In addition, water spinach had little absorptive capacity to the added medicine, thus showing extremely low potential risk.
Last Update:
2024-01-01