Multifunctional bioremediation medicament for cadmium-contaminated farmlands and repair method

Abstract

The invention discloses a multifunctional bioremediation medicament for cadmium-contaminated farmlands and a repair method. The bioremediation medicament, in parts by weight, comprises the following components: 30-60 parts of phosphorus base compound, 10-30 parts of silicon base compound, 5-10 parts of calcium base compound, and 1-5 parts of biological materials. The repair method comprises the following steps: the bioremediation medicament is prepared according to the pollution index of cadmium in soil; the bioremediation medicament is uniformly scattered on the surface layer of the soil needing treatment, and is uniformly mixed with the soil through ploughing for curing; and after curing, the farmlands are normally cultivated. Besides of passivation of the activity of heavy metal in the soil, the properties of the soil can be regulated to improve the microorganism environment in the soil, so that the microorganism growth is accelerated, and the content of cadmium in food crops is controlled to achieve the standard limit value of cadmium in the national food crops when the grain yield is guaranteed.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a multifunctional biological remediation agent and a remediation method for cadmium-contaminated farmland. Background technique [0002] With the development of modern agriculture, heavy metal pollution in farmland is becoming more and more serious. According to the "National Pollution Survey Report" in 2014, the overall situation of my country's soil environment is not optimistic. Some areas have serious soil pollution, and the quality of cultivated land soil environment is worrying. Among them, the rate of cadmium pollutant points exceeding the standard reached 7%, which is the heavy metal pollutant that my country's agricultural products are mainly concerned about. Cadmium is one of the well-known "five poisonous" elements of heavy metals. It has the characteristics of long decomposition cycle (half-life over 20a), high toxicity, and refractory degradati...

AI Technical Summary

Problems solved by technology

At this stage, the control of cadmium pollution in farmland is mainly through the addition of chemicals, changing the environmental conditions to change the form of cadmium in the soil, thereby reducing the migration and biological mobility of cadmium, and achieving the purpose of pollution control and sustainable land use; A large number of additions lead to serious soil salinization, resulting in the loss of soil ecological functions after restoration