改性椰壳炭钝化修复农田土壤镉、铅的长期稳定化效果及生态风险评估

毛欣宇; 于怀志; 翟森茂; 姜小三; 徐洲; 王琪琳

doi:10.13205/j.hjgc.202204020

改性椰壳炭钝化修复农田土壤镉、铅的长期稳定化效果及生态风险评估

doi: 10.13205/j.hjgc.202204020

1. 河海大学农业科学与工程学院, 南京 211000;
2. 南京农业大学泰州研究院, 江苏泰州 225300

基金项目:

泰州市科技支撑计划(农业)项目(SNY20208551)

中央高校基本科研业务费项目(2019B08514)

国家自然科学基金青年项目(51809076)

泰州市级财政专项资金项目(20201301)

详细信息

通讯作者:
毛欣宇(1988-),男,博士,教授,主要研究方向为农业水土环境修复与保护。mxy880731@163.com

计量
- 文章访问数: 67
- HTML全文浏览量: 9
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-25
- 网络出版日期: 2022-07-06

LONG-TERM STABILIZATION EFFECT AND ECOLOGICAL RISK ASSESSMENT OF SOIL CADMIUM AND LEAD BY USING MODIFIED COCONUT SHELL BIOCHAR

1. College of Agricultural Science and Engineering, Hohai University, Nanjing 211000, China;
2. College of Taizhou Research Institute, Nanjing Agricultural University, Taizhou 225300, China

摘要

摘要: 为探究改性椰壳炭钝化修复土壤中镉、铅的长期效果及生态风险,采取硝酸-高锰酸钾改性方法优化椰壳炭表征,通过设置不同改性椰壳炭用量,探究其对土壤中镉、铅生物有效性的长期影响,结合土壤-农产品综合质量影响指数评价结果,最终验证其场地应用的可行性。结果表明:改性椰壳炭可显著提高土壤镉、铅的稳定性,当用量>20 g/kg时,钝化培养12周,土壤中镉、铅以残渣态为主,固定率较对照组分别提高了8%~23%和11%~24%。钝化培养15~18周,土壤镉、铅有效态含量均低于安全阈值,且种植蔬菜未检测到重金属超标,不存在生态风险。采用改性椰壳炭进行土壤重金属场地修复具有一定应用价值。
- 改性生物炭 /
- 镉 /
- 铅 /
- 长期钝化效果 /
- 生态风险评估
Abstract: Heavy metal pollution in farmland soil attracted broad attention in China due to its harm to human health and ecological environment. In order to explore the feasibility of biochar on remediating soil heavy metals in pilot-scale, the long-term stabilization effect and ecological risk of soil cadmium and lead was studied by using the nitric acid and potassium permanganate modified coconut shell biochar. With application of different dosages of biochar, the long-term variation of soil cadmium and lead bioavailability was discussed, in combination with the results of soil-agricultural product comprehensive quality impact index, to evaluate the possible ecological risk after the remediation. The results showed that the modified biochar could significantly improve the stability of soil cadmium and lead. When the applied amount of modified bichar was higher than 20 g/kg, soil cadmium and lead were mainly in residual fraction after 12 weeks and the immobilization rates were increased by 8%~23% and 11%~24%, respectively, compared with the control group. After 15~18 weeks’ remediation, the contents of bioavailable cadmium and lead in soil were maintained within the safety threshold, and no excessive metals were detected in the planted vegetables. This study indicated that it might be desirable to use modified coconut shell biochar for large-scale remediation of soil heavy metals.
- modified biochar /
- cadmium /
- lead /
- long-term stabilization effect /
- ecological risk assessment

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