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Volume 10 Issue 2
Jun.  2019
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HUANG Wei, DIAO Xiaoping, LI Sennan, GONG Ying. Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure[J]. Journal of Tropical Biology, 2019, 10(2): 151-158. doi: 10.15886/j.cnki.rdswxb.2019.02.009
Citation: HUANG Wei, DIAO Xiaoping, LI Sennan, GONG Ying. Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure[J]. Journal of Tropical Biology, 2019, 10(2): 151-158. doi: 10.15886/j.cnki.rdswxb.2019.02.009

Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure

doi: 10.15886/j.cnki.rdswxb.2019.02.009
  • Received Date: 2019-01-09
  • Rev Recd Date: 2019-03-03
  • Pig manure separated from the dry and the wet was used as substrate, inoculated with earthworms(Eisenia fetida) and cultured indoors for 4 weeks. The contents of heavy metals(Cu, Zn, Cr, Pb, Cd, As) in the pig manure and earthworms were determined by the inductively coupled plasma mass spectrometry(ICP-MS). The speciation changes in the pig manure and the enrichment of heavy metals in the earthworms were systematically analyzed under the action of the earthworms. The experimental results showed that the pig manure promoted the growth of earthworms, increased the body weight of the earthworms obviously after 4 weeks of treatment and had no effect on the reproduction of the earthworms. After 4 weeks of earthworm treatment, the pH value of the pig manure increased from 6.51 to 6.86. The total amount of Cu, Zn, Cr, Pb, Cd and As in the pig manure decreased by 13.69%, 24.47%, 30.70%, 39.17%, 21.91% and 9.36%, respectively, compared with the control group. Meanwhile, the proportion of Zn, Cr and Cd in the pig manure decreased by 15%, 27% and 27%, respectively compared with the control group. The earthworms had a certain effect on enrichment of heavy metals. The concentrations of Cu, Zn, Cd and As, except for Cr, in the earthworms increased by 0.49 mg·kg-1, 3.86 mg·kg-1, 0.012 mg·kg-1 and 0.064 mg·kg-1, respectively compared with those before the experiment, and showed a time-effect relationship. The biota-sediment accumulation factors increased in the order of Tr>Cd>Zn>Cu>As. This indicates the earthworms can enrich heavy metals and reduce the content of heavy metals in the pig manure and the proportion of heavy metals in the form of residue in the pig manure, which is conducive to the transfer and removal of heavy metals.
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Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure

doi: 10.15886/j.cnki.rdswxb.2019.02.009

Abstract: Pig manure separated from the dry and the wet was used as substrate, inoculated with earthworms(Eisenia fetida) and cultured indoors for 4 weeks. The contents of heavy metals(Cu, Zn, Cr, Pb, Cd, As) in the pig manure and earthworms were determined by the inductively coupled plasma mass spectrometry(ICP-MS). The speciation changes in the pig manure and the enrichment of heavy metals in the earthworms were systematically analyzed under the action of the earthworms. The experimental results showed that the pig manure promoted the growth of earthworms, increased the body weight of the earthworms obviously after 4 weeks of treatment and had no effect on the reproduction of the earthworms. After 4 weeks of earthworm treatment, the pH value of the pig manure increased from 6.51 to 6.86. The total amount of Cu, Zn, Cr, Pb, Cd and As in the pig manure decreased by 13.69%, 24.47%, 30.70%, 39.17%, 21.91% and 9.36%, respectively, compared with the control group. Meanwhile, the proportion of Zn, Cr and Cd in the pig manure decreased by 15%, 27% and 27%, respectively compared with the control group. The earthworms had a certain effect on enrichment of heavy metals. The concentrations of Cu, Zn, Cd and As, except for Cr, in the earthworms increased by 0.49 mg·kg-1, 3.86 mg·kg-1, 0.012 mg·kg-1 and 0.064 mg·kg-1, respectively compared with those before the experiment, and showed a time-effect relationship. The biota-sediment accumulation factors increased in the order of Tr>Cd>Zn>Cu>As. This indicates the earthworms can enrich heavy metals and reduce the content of heavy metals in the pig manure and the proportion of heavy metals in the form of residue in the pig manure, which is conducive to the transfer and removal of heavy metals.

HUANG Wei, DIAO Xiaoping, LI Sennan, GONG Ying. Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure[J]. Journal of Tropical Biology, 2019, 10(2): 151-158. doi: 10.15886/j.cnki.rdswxb.2019.02.009
Citation: HUANG Wei, DIAO Xiaoping, LI Sennan, GONG Ying. Effect of Earthworms on Enrichment of Heavy Metals in Pig Manure[J]. Journal of Tropical Biology, 2019, 10(2): 151-158. doi: 10.15886/j.cnki.rdswxb.2019.02.009
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