The influence of pH to the P-recovery from human urine via struvite formation
The urine from flushing toilet contains different nutrients, such as nitrogen, phosphorus, etc., and pathogens are few, so it has a very good value as fertilizer. This experiment uses struvite formation process to recycle phosphorus of urine and has studied the influence of the pH value to the effect of phosphorus recycling with emphasis. The test result indicated that the influence of different magnesium/phosphorus to the pH value of urine has little difference. The effect of the phosphorus recycling from urine via struvite is different under the condition of different urine initial pH value. When initial pH value of the urine climbs to 8 from 7, the phosphorus return-ratio increases quite big. When the urines initial pH value elevates between 8 and 10, the phosphorus return-ratio has a tendency to increase, but is quite gentle. Along with the urines initial pH value elevates continuously, and the phosphorus return-ratio has a downtrend. In addition, under different urines initial pH value conditions, the ingredient of struvite precipitation is different. When the urines initial pH value is 7, it nearly has no precipitation. When the urines initial pH value changes in 8～10 scopes, the production precipitation is mainly the struvite crystal. When the urines initial pH value elevates to 11 above, the production precipitation is mainly the amorphous state material. The pH value of urine will drop after it becomes struvite.
Ecosan Urine Struvite Phosphorus recycling
Yifei Li Zifu Li Jian Zhang Liang Li Huiming Wang Xiaolin Fan
Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, 10083, Beijing, China
国际会议
2009 Beijing International Environmental Technology Conference(2009北京国际环境技术会议暨第五届“中、德、波环境技术研讨会)
北京
英文
664-675
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）