When the content of heavy metals is lower than the relevant standards, it can be used as biomass energy or organic fertilizer.
When the content of heavy metals is higher than the allowable value of land, it cannot be used for soil fertilization and can be burned, but the incineration residue needs further treatment, such as solidification-landfill.
When the content reaches the standard of hazardous waste, it can be directly sealed and buried after pretreatment, and can be used as raw material for recovering heavy metals when it has economic benefits.
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