钝化材料对猪粪堆肥过程中重金属（Cu、Zn）形态转化的影响及其植物毒性分析

doi:10.12160/j.issn.1672-5190.2019.08.002

Abstract

Abstract: The effect of two heavy metal passivators （biochar and VT-1000 microorganisms agent） on concentrations and forms of heavy metals （Cu and Zn） during pig manure composting was studied by BCR sequential extraction method. Furthermore, the phytotoxicity of the compost treated with the two heavy metal passivators was evaluated. The results showed that after composting, the total concentrations of Cu and Zn in pig manure exhibited a ′relative concentration effect′, resulting in an increase in their concentrations. Composting treatment promoted the transformation of Zn from high-activity form to low one, thereby reducing its bioavailability. Biochar had better passivation effect on Cu and Zn after composting, and its passivation rate on acid extractable fraction of Cu and Zn was 27.23% and 73.46%, respectively. The composted pig manure treated with the two passivation materials had no significant （P>0.05） effect on germination rate, root length and germination index of the seeds. It was indicated that the pig manure treated by composting was fully decomposed and had no inhibitory effect on seed germination. The combined data suggest that biochar is an ideal passivation material for reducing the bioavailability of Cu and Zn in pig manure, and it is conductive to reduce the risk of heavy metal pollution in land fertilized with pig manure compost.

Key words: biochar, VT-1000 microorganisms agent, pig manure, heavy metal, passivation

CLC Number:

S141.4
X53

DIAO Li-peng, ZHANG Zhuo-yi, WU Di-mei, HUANG Zhen, BAI Ruo-bing. Effect of Passivation Materials on Form Transformation of Heavy Metals (Cu, Zn) During Pig Manure Composting and Assessment of Their Phytotoxicity[J]. Animal Husbandry and Feed Science, 2019, 40(8): 6-11.

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Effect of Passivation Materials on Form Transformation of Heavy Metals (Cu, Zn) During Pig Manure Composting and Assessment of Their Phytotoxicity

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