ZHANGQi,DENGYing-ying,LIUYuan.Simultaneous Recovery of Phosphorus and Electricity from Partially Hydrolyzed Urine[J].China Water & Wastewater,2024,40(7):73-78.
Click Copy

Simultaneous Recovery of Phosphorus and Electricity from Partially Hydrolyzed Urine

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第7期 Page: 73-78 Column: Date of publication: 2024-04-01
Author(s):
ZHANG　Qi1; 2; 3;  DENG　Ying-ying2; 3;  LIU　Yuan2
（1. College of River and Ocean Engineering， Chongqing Jiaotong University， Chongqing 400074， China； 2. Chongqing Institute of Green and Intelligent Technology， Chinese Academy of Sciences， Chongqing 400714， China； 3. College of Resource and Environment， University of Chinese Academy of Sciences， Beijing 100049， China）
Keywords:
urine;  struvite;  phosphorus recovery;  magnesium-air fuel cell;  urea;  hydrolysis degree
Abstract:
It is easy to obtain partially hydrolyzed urine, and struvite is a high-quality phosphorus containing slow-release fertilizer with high economic value. This paper aimed to recover high-purity struvite precipitates from partially hydrolyzed urine and preserve most of the urea in a magnesium-air fuel cell (MAFC) platform. The results of urine hydrolyzed theoretical calculations and phosphorus recovery experiment showed that the hydrolysis degree of 10% was favor for the struvite precipitation since urine could provide sufficient ammonium salt, alkalinity and buffering capacity. After 60 min of reaction in MAFC, the proportion of struvite (including potassium struvite) in the collected precipitates was 94.92%, and the removal rate of PO43--P in the urine reached 95.86%. The initial urea with proportion of 95.74% was preserved, and the treatment of 1 m3 of urine simultaneously recovered 0.044 kW·h of electricity. Therefore, partially hydrolyzed urine can achieve simultaneous recovery of high-purity struvite precipitation and electricity in MAFCs.
Last Update: 2024-04-01