701 results about "Cadmium pollution" patented technology

The invention discloses a remediation method for cadmium-contaminated soil, and belongs to the field of soil remediation. In the remediation method, wood vinegar and biochar are prepared from rice straw and/or oilseed rape straw; paddy rice is planted in the cadmium-contaminated soil from May to October of each year firstly, and biochar is applied before paddy rice planting, so that paddy rice conforming to the national standard can be prepared in the cadmium-contaminated soil (to be specific, the cadmium content conforms to the national standard); oilseed rape is planted in the cadmium-contaminated soil from the time after the harvest of the paddy rice to May of next year, and wood vinegar is applied in a specific period to remove cadmium in the cadmium-contaminated soil safely and effectively, so that cadmium in the soil is effectively removed. Moreover, the method effectively utilizes the whole year, thereby guaranteeing the harvest of cereal crops while realizing the remediation of contaminated soil.

The invention discloses a remediation method for heavy metal cadmium pollution of orchard soil based on galinsoga parviflora. The remediation method comprises the following steps: preparing galinsoga parviflora seedlings in a direct transplanting mode or a direct seeding mode; watering to guarantee the water-holding capacity of soil in a field and performing daily management on the galinsoga parviflora; performing harvesting treatment, i.e., harvesting the aboveground part of the galinsoga parviflora. The galinsoga parviflora has resistance and hyperaccumulation feature to cadmium heavy metal, the seedlings absorb and accumulate the cadmium heavy metal in the contaminated soil of the orchard, and the cadmium is transferred to the aboveground part to reduce the cadmium content in the orchard soil, so that the purpose of reducing the cadmium content in the contaminated soil of the orchard is achieved. In addition, the galinsoga parviflora has strong reproductive capacity, grows quickly and is shade-tolerant, the base part has strong branching capacity and can sprout after being harvested; the galinsoga parviflora can be planted almost all the year round in southern China and can grow in extremely barren land, the cost is low, the operability is high, and a new plant genetic resource is developed for phytoremediation of the heavy metal cadmium contaminated orchard soil.