The invention discloses a
biochar-
plant combined remediation method for mine heavy
metal contaminated soil, and relates to modified
biochar and a remediation accelerator.The preparation method of the modified
biochar comprises the steps that peanut shells are subjected to high-temperature
carbonization and then added into a
ferric iron solution to neutralize a NaOH solution, ultrasonic treatment is conducted, and the biochar is obtained; a
biomass raw material is crushed and composted to obtain pretreated
biomass, then the pretreated
biomass and a
ferric iron solution are subjected to a heating reaction, a
reaction product is mixed with the biochar,
carbonization is continued, and the biochar is obtained. The repairing
accelerant comprises turf, phospholime
powder,
mannitol, a
plant growth regulator, a
microbial agent and a chelating agent. According to the remediation method, planting of the modified biochar, the remediation
accelerant and the enrichment plants is combined, a synergistic remediation mechanism is formed, the three components have a synergistic effect, the removal efficiency of heavy
metal is remarkably improved, the biomass and the
survival rate of the enrichment plants are improved, and efficient and accurate remediation of the mine heavy
metal contaminated soil is achieved.