Multi-functional composite conditioner for controlling cadmium-polluted soil and remediation method for soil cadmium pollution

Abstract

The invention discloses a multi-functional composite conditioner for controlling cadmium-polluted soil and a remediation method for soil cadmium pollution. The multi-functional composite conditioner comprises an inorganic passivation agent for soil heavy metal cadmium, an organic passivation agent and a cadmium antagonist, wherein the inorganic passivation agent is selected from red mud, hydroxyapatite, bentonite, zeolite or dolomite; the organic passivation agent comprises cruciferous plant residues or liliaceous plant residues. The cruciferous plant residues are Chinese cabbage plant residues, rape plant residues, leaf mustard plant residues or cabbage plant residues, and the liliaceous plant residues are garlic plant residues, onion plant residues or Chinese chive plant residues. The cadmium antagonist is a compound containing Zn, Ca or Fe. The multi-functional composite conditioner adopts a composite cadmium remediation mode, can reduce the content of cadmium in plant bodies, and provides an effective, feasible and economic means for the planting of agricultural products with normal content of cadmium.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal treatment, in particular to a multifunctional composite conditioner for treating cadmium-contaminated soil and its application in soil cadmium-polluted restoration methods. Background technique [0002] In recent years, with the development of industry and urbanization, the risk of cadmium (Cd) pollution in farmland soil in my country has become increasingly prominent. Cd has been widely concerned because it can persist in the soil environment, accumulate and pass through the biological food chain, and cause harmful effects on human health. my country's Cd polluted farmland has exceeded 1.3×10 4 hm 2 , involving 25 regions in 11 provinces and cities. At present, the concentration of Cd in the edible parts of many vegetables grown on medium and low Cd-polluted farmlands, such as leafy spinach, has exceeded the national standard of 0.2mg kg -1 . In particular, incidents of cadmium exce...

AI Technical Summary

Problems solved by technology

However, since the degree of cadmium pollution is increasing year by year, the amount of a single passivating agent that needs to be added is also greater. For example, when using a cadmium phosphate passivating agent, the passivating agent has too much influence on the soil pH, reduces the soluble phosphorus content in the soil, and causes Phosphorus eutrophication, passivation effect is not ideal

Images