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| Influence of biochar prepared by co-pyrolysis with attapulgite and sludge on maize growth and heavy metal accumulation |
| Received:December 14, 2019 |
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| KeyWord:attapulgite;sludge biochar;heavy metal;stabilization;accumulation |
| Author Name | Affiliation | E-mail | | TAO Ling | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co. Ltd, Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China | | | ZHANG Qian | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | ZHANG Xue-bin | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | ZHOU Ya-qi | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | SUN Meng-jie | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | REN Jun | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co. Ltd, Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China | renjun@mail.lzjtu.cn |
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| Abstract: |
| Seven kinds of biochar were prepared by co-pyrolysis with sludge and different amounts of attapulgite(0, 5%, 10%, 15%, 20%, 25%, 30%)and were applied to maize seedlings in pot experiments in order to stabilize heavy metals(Cu, Zn, Pb, Ni, Cd)and affect growth. The results suggested that adding 15% attapulgite to biochar significantly increased maize germination rate and plant height, which increased by 55.87% and 24.35%, respectively. When the amount of attapulgite added was 20%, root length, fresh weight, and dry weight increased by 65.57%, 79.85%, and 76.84%, respectively. Biochar prepared by co-pyrolysis with attapulgite and sludge significantly inhibited the enrichment of heavy metals. The addition of 15% attapulgite significantly inhibited the accumulation of Cu, Zn, Ni, and Cd in maize, reducing accumulation by 55.01%, 49.27%, 54.87%, 41.99%, respectively. Furthermore, the addition of 20% attapulgite reduced the accumulation of Pb by 34.01%. The addition of attapulgite enhances the passivation function of sludge biochar and provides a new method for the safe use of sludge. |
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