WEIHai-shan,WANGYi,WANGWen-huai,et al.Harvesting Strategy of Ecological Floating Bed Plants and Its Utilization to Prepare Biochar for Heavy Metals Adsorption[J].China Water & Wastewater,2023,39(5):17-23.
Harvesting Strategy of Ecological Floating Bed Plants and Its Utilization to Prepare Biochar for Heavy Metals Adsorption
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第5期
Page:
17-23
Column:
Date of publication:
2023-03-01
- Keywords:
- ecological floating bed plant; harvesting strategy; resource utilization; biochar; heavy metal adsorption
- Abstract:
- To accurately formulate the harvesting strategy of ecological floating bed plants and seek for the resource utilization method of the harvested plants, the changes of nitrogen and phosphorus contents in stems, leaves and roots of different plants in ecological floating bed were monitored first, and then the harvested plant tissues were pyrolyzed in high temperature and oxygen-limited environment to prepare biochar for removing heavy metals from wastewater, and the adsorption mechanism was eventually analyzed. The stems and leaves of Calamus and Lythrum should be harvested from late October to early November each year, while Iris and Hydrocotyle vulgaris did not need to be harvested. In addition, the biochar prepared by stems and leaves of Calamus pyrolyzed at 400 ℃ was selected to remove heavy metals from wastewater. The saturated adsorption capacities of Pb2+, Cu2+, Ni2+ and Mn2+ reached 256.189 mg/g, 52.538 mg/g, 49.141 mg/g and 43.463 mg/g, respectively, which conformed to the monolayer adsorption of Langmuir model. Except adsorption, the cationic π interaction between biochar and heavy metals and precipitation of heavy metals under alkaline conditions also contributed to the removal of heavy metals from wastewater.
Last Update:
2023-03-01