Method for restoring paddy cadmium pollution by combining water management with passivator adding

Abstract

The invention belongs to the technical fields of control of soil pollution and quality safety of agricultural products and provides a method for restoring paddy cadmium pollution by combining water management with passivator adding in order to solve the control problem of paddies with severe cadmium pollution. The method comprises the steps that cadmium polluted paddy soil is treated through a composite passive material, rice is transplanted, water management is conducted, and the composite passive material is formed by proportionally mixing natural palygorskite and sulfydryl-modified palygorskite. Rice with the cadmium content reaching the standard can be produced through the paddy soil with severe cadmium pollution, the soil pollution problem is solved, the food security is ensured, and the method is significant. The composite passive material is easy to apply, low in cost and free of adverse effect on environment and does not influence regular growth and yield formation of rice, and the passivation effect on cadmium in soil can be maintained for 3-4 years by applying the composite passive material to soil once. After the composite passive material is applied to the cadmium polluted paddies soaked in water for a long time, the effect that cadmium accumulation is reduced is remarkable, and the cadmium content of produced brown rice meets the current national standard.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

AI Technical Summary

Benefits of technology

This patented technology uses special materials mixed together during construction or use to protect crops from heavy metal contamination caused by water runoff. These compositions are easy to apply evenly over large areas without causing damage to their roots. They work well when used alone but may lose its ability if they get into deeper groundwater layers where there could harm them more severely due to environmental factors such as acidic conditions at certain depth levels below sea level (pH<7).

Problems solved by technology

This patents discusses different methods used during recovery from contamination areas on slopes or other water bodies where there may also accumulate harmful materials such as lead that can cause injury if absorbed into living organism. These techniques include both physical removal and chemistry solutions like phosphorus acid esters and zinc sulfates. Additionally, some research suggests that even small amounts of certain compounds found naturally occur within crop roots themselves when they enter our natural ecosystems with high levels of nitrogen, making them potential sources of secondary nutrients. Therefore, finding ways to restore their original condition without damaging surrounding vegetables could help address concerns over public safety issues related to heavy metal exposures.

Images