ZHANG Jun,SONG Meng-meng,GAO Xing,et al.Effect of Biochar Filling Mode and Aging on Leaching of Nitrogen and Phosphorus in Bioretention Facilities[J].China Water & Wastewater,2020,36(15 15):100-106.
Effect of Biochar Filling Mode and Aging on Leaching of Nitrogen and Phosphorus in Bioretention Facilities
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
15 15
Page:
100-106
Column:
Date of publication:
2020-08-01
- Abstract:
- In order to investigate the effects of biochar addition on characteristics and nutrient leaching in bioretention facilities, deionized water was used to simulate the precipitation leaching of different substrates. After adding biochar, saturated water conductivity and retention capacity of the substrates increased by 21% and 41% on average, and the accumulative leaching of nitrogen and phosphorus nutrients was reduced. After adding pre-aging biochar, the substrate with mixed biochar filling showed higher saturated hydraulic conductivity and retention capacity than those of stratified filling. After aging, the hydrophily, polarity and acidic functional groups of the biochar increased and the electrostatic repulsion decreased, and alternating wetting and drying mode had stronger aging effect than the constant wetting mode. The saturated water conductivity, retention capacity and cumulative leaching loss control ability of nitrogen and phosphorus increased with aging of the biochar. Therefore, this property of biochar was expected to be used for long-term control of nitrogen and phosphorus leaching in substrate of bioretention facilities.
Last Update:
2020-08-01