›› 2020, Vol. 32 ›› Issue (1): 141-148.DOI: 10.3969/j.issn.1004-1524.2020.01.18

• Environmental Science • Previous Articles     Next Articles

Effect of montmorillonite addition on aerobic composting and heavy metals passivation of pig manure

HUANG Jian1,2, XIAO Jianzhong1, TANG Shigang1,*, ZHENG Qiang1, DING Fenghua1, ZHANG Dongxu1   

  1. 1. College of Ecology, Lishui University, Lishui 323000, China;
    2. Department of Chemical Engineering, Ningbo Polytechnic, Ningbo 315800, China
  • Received:2019-09-13 Online:2020-01-25 Published:2020-03-11

Abstract: To further improve the composting process, montmorillonite was added during pig manure composting with straw. The temperature, pH values, electrical conductivity (EC) values, germination index (GI) and metal phases were determined to illustrate the effects of montmorillonite addition on the maturity of pig manure compost and the passivation effect of Cu and Zn. The results indicated that the addition of montmorillonite could increase the aerobic composting temperature of pig manure and prolong the high temperature period, effectively promote compost maturity and improve compost quality. The seed germination index could reach 92% when the montmorillonite addition amount was 5% of the dry weight of pig manure. Adding proper amount of montmorillonite could improve the passivation effect of heavy metals. The passivation rate of exchangeable Cu and Zn could reach 23.7% and 17.2%, respectively, when the addition amount was 5% of the dry weight of pig manure.

Key words: pig manure, aerobic composting, montmorillonite, heavy metal

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