Leaching Effect of Biochar and Zeolite on Pb, Cd and W in Tungsten Ore Area of Jiangxi Province Under Simulated Acid Rain Conditions

LIAO Yueqing; CHEN Ming; ZHENG Xiaojun; ZOU Jieping; WANG Junfeng; CHEN Weijiang; WANG Miaomiao

doi:10.13870/j.cnki.stbcxb.2021.06.043

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Leaching Effect of Biochar and Zeolite on Pb, Cd and W in Tungsten Ore Area of Jiangxi Province Under Simulated Acid Rain Conditions

更新时间：2025-03-12

- Leaching Effect of Biochar and Zeolite on Pb, Cd and W in Tungsten Ore Area of Jiangxi Province Under Simulated Acid Rain Conditions
- Vol. 35, Issue 6, Pages: 319-326(2021)
- 作者机构：
  
  稀有稀土资源开发与利用省部共建协同创新中心, 江西省矿冶环境污染与控制重点实验室, 江西理工大学资源与环境工程学院,江西,赣州,341000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.06.043
  CLC： X53
- Published：2021
- 稿件说明：
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LIAO Yueqing, CHEN Ming, ZHENG Xiaojun, et al. Leaching Effect of Biochar and Zeolite on Pb, Cd and W in Tungsten Ore Area of Jiangxi Province Under Simulated Acid Rain Conditions[J]. 2021, 35(6): 319-326.
DOI：

LIAO Yueqing, CHEN Ming, ZHENG Xiaojun, et al. Leaching Effect of Biochar and Zeolite on Pb, Cd and W in Tungsten Ore Area of Jiangxi Province Under Simulated Acid Rain Conditions[J]. 2021, 35(6): 319-326. DOI： 10.13870/j.cnki.stbcxb.2021.06.043.

摘要

为解决江西某钨矿区钨及其他重金属污染问题，通过室内模拟酸雨淋溶试验，研究在不同pH （3.1，4.5，5.8）酸雨条件下，添加稻壳生物炭（BC）、天然沸石（ZE）、稻壳生物炭—天然沸石（CO）改良剂对土壤Pb、Cd、W的固定效果。结果表明，酸雨增加了重金属的溶出风险，pH越低，风险越大。添加BC、ZE、CO有效提高土壤的酸缓冲能力，平均分别使得淋溶液pH增加0.53，0.23，0.58个单位，使得淋溶后土壤pH增加0.27，0.09，0.17个单位。在pH=4.5和pH=5.8模拟酸雨后，生物炭联合沸石处理Cd和Pb的淋溶总量明显低于未处理土壤，相较于空白分别降低32.1%，38.0%和36.0%，32.7%。W和Cd、Pb不同，在模拟酸雨pH=3.1条件下，添加改良剂对W淋溶总量均无显著影响，在模拟酸雨pH=4.5和pH=5.8时，单独施用生物炭处理使得W淋溶总量分别增加44.3，53.8 μg/L，但生物炭联合沸石处理使得W淋溶总量分别降低6.0，7.1 μg/L。综合来看，生物炭—沸石能更有效同时防止酸雨条件下污染土壤Pb、Cd、W的淋溶流失，可为后期钨矿区重金属污染防治提供参考。

Abstract

To solve Jiangxi tungsten and other heavy metal pollution problems

an indoor simulated acid rain leaching test was conducted in this study. In the test

we studied the fixed effect of soil amendments such as rice husk biochar (BC)

natural zeolite (ZE) and rice husk biochar-natural zeolite (CO) on the soil Pb

Cd and W under the conditions of acid rain with different pH (3.1

4.5 and 5.8). The results showed that acid rain increased the leaching risk of heavy metals

and the lower the pH

the greater the risk. The addition of BC

ZE and CO effectively improved the acid buffering capacity of soil

and increased the pH of the leaching solution by 0.53

0.23 and 0.58 units on average

respectively

and increased the soil pH by 0.27

0.09 and 0.17 units on average after leaching. After leaching of simulated acid rain with pH=4.5 and pH=5.8

the total leaching amounts of Cd and Pb in CO treatment were significantly lower than those in untreated soil

and decreased by 32.1%

38.0% and 36.0%

32.7%

respectively

compared with untreated soil. W was different from Cd and Pb. Under the condition of simulated acid rain with pH=3.1

the addition of amendments had no significant effect on the total leaching amount of W. When the pH of simulated acid rain were 4.5 and 5.8

the total leaching amounts of W increased by 44.3 μg/L and 53.8 μg/L in the treatment of applying biochar alone

respectively. However

biochar combined with zeolite treatment reduced the total leaching amounts of W by 6.0 μg/L and 7.1 μg/L

respectively. In conclusion

biochar combined with zeolite could more effectively prevent leaching loss of Pb

Cd and W from contaminated soil under acid rain conditions

which could provide a reference for prevention and control of heavy metal pollution in tungsten ore areas.

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