The invention discloses a soil in-situ remediation and heavy
metal removing method. The method comprises the steps that a, a
composite material is diluted with water and then sprayed to heavy-
metal contaminated soil according to the proportion of 100-200 L / mu, and the
composite material is applied
every other week and applied continuously for one month; b, modified Chinese
medicine residue and
organic manure are mixed and sown in the heavy-
metal contaminated soil by adopting a
tractor-ploughing method; and c, weighing method watering is adopted for keeping the
soil water content to be 50-60% of the treated
soil water-holding capacity and is performed for 7-10 days successively. Soil contaminated with various
heavy metals such as Pb, Cd, Cu, Zn, Cr and As and toxic organic substances such as chlorinated organic compounds, bromo-organic matters and
antibiotics can be remediated, the form that the heavy metal activity and
biological availability in the soil are high is relieved, the heavymetals are prevented from migrating and transforming to plants from the soil, biological concentration and amplification of the
heavy metals are avoided, the
heavy metals such as Cr and Hg in the soil can be efficiently removed, the original functions of the soil are restored,
agricultural development requirements are met, the
ecological safety of the plants such as crops is guaranteed, and accordingly, ecological risks, caused by biological amplification and concentration of the heavy metals, to the people are avoided.