|
| Stability of biochar-remediated contaminated soil from a lead mine site |
| Received:April 19, 2021 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar;aging;soil remediation;lead;enzyme activity |
| Author Name | Affiliation | | YANG Kai | College of Water Sciences, Beijing Normal University, Beijing 100875, China | | WANG Yingying | College of Water Sciences, Beijing Normal University, Beijing 100875, China | | DING Aizhong | College of Water Sciences, Beijing Normal University, Beijing 100875, China |
|
| Hits: 1093 |
| Download times: 1066 |
| Abstract: |
| This study investigated the stability of biochar-remediated contaminated soil from a lead mine site and its influence on the soil quality. In this context, the contaminated topsoil of a lead mine site in Shanxi Province was collected and mixed with wheat straw biochar and corn straw biochar pyrolyzed at 500℃ at a mass ratio of 0(control) and 5%, respectively. Then, this mixture was subjected to three aging experiments:30 d constant temperature and moisture; wet-dry cycling(30 d); and freeze-thaw cycling(30 d). The results showed that under the three aging conditions, the corn straw biochar consistently had a better immobilization effect on soil Pb as opposed to the wheat straw biochar. Compared to the three corresponding controls, the available soil Pb concentration with the addition of corn straw biochar was reduced by 47.4%, 16.1%, and 45.0%, respectively. Corn straw biochar had no negative effect on the geometric mean of soil invertase, urease, and catalase activities. Thus, the corn straw biochar demonstrated a higher potential for the in situ remediation of contaminated soil at lead mine sites compared with its wheat straw counterpart. |
|
|
|
