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| Accumulation of Heavy Metals in Different Pig Bio-Beds |
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| KeyWord:bio-bed; heavy metal accumulation; available heavy metals; potential ecological risk; material flow analysis（MFA） |
| Author Name | Affiliation | | ZHANG Li-ping | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | SHENG Jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | SUN Guo-feng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | ZHENG Jian-chu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China |
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| Abstract: |
| Bio-bed is a novel ecological system for pig raising. Its impacts on the environment are arousing concerns. This study was designed to examine accumulation of Zn, Cu and As in three different bio-beds：40% rice husk+60% mushroom bran（FJ）, 40% rice husk+ 60% sawdust（FD） and 40% rice husk+60% Vinasse（FW） using material flow analysis（MFA）. The profile distribution of Zn, Cu and As in bio-beds and their activities in the soil underneath were also investigated. The potential ecological risk index of Hakanson was applied to evaluate the potential ecological risk to the area. After one production cycle, contents of Cu and Zn decreased, but As increased with the bio-bed depth. Most of three heavy metals were detained in the bio-beds, with only a very small part leaked into the soil underneath through eluviations. Different bio-beds were different in absorption and activities of heavy metals. Zn, Cu and As did not exceed the minimal ecological risk threshold（RI≤150） in three bio-beds. Three years of life span for a bio-bed were recommended to control Cu, Zn and As pollution and retain nutrients in organic fertilizers. |
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