Bacterial strain and bacterial agent for reducing cadmium content and preparation and use method thereof

Abstract

The invention discloses a bacterial strain for reducing cadmium content, a bacterial agent and a preparation and application method thereof. The strain is Paenibacillus polymyxa P1 with a preservation number of CCTCC NO: M 2014319; the bacterial agent obtained after fermentation is applied to rice fields with mild to moderate cadmium pollution, which can effectively reduce the cadmium content in rice and has huge Promote application value.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a bacterial strain for reducing cadmium content, a bacterial agent and a preparation and use method thereof. Background technique [0002] Soil is the main material basis for human survival. However, due to the increasing mining, smelting, processing, and commercial manufacturing activities of heavy metals, many heavy metals such as lead, cadmium, and mercury enter the atmosphere, water, and soil, causing serious environmental pollution. According to statistics, about 30,000 tons of cadmium is released into the environment every year in the world, and 82%-94% of the cadmium will enter the soil. Long-term intake of rice, vegetables, and fruits seriously polluted by cadmium, and drinking water with excessive cadmium will cause symptoms of chronic poisoning, affect the nervous system, hematopoietic system, digestive system, and repro...

AI Technical Summary

Problems solved by technology

Hunan Province is the main grain producing area in the country. It has been known as the "land of fish and rice" and "the world's granary" since ancient times. It shoulders the great responsibility of ensuring national food security. The quality of "Xiangmi" has been compromised, causing great harm to the health of local residents

[0003] Currently, heavy metal-contaminated soil remediation technologies mainly include phytoremediation, electrodynamic remediation, leaching, thermal desorption, vitrification, and fixation and stabilization. Among the above heavy metal-contaminated soil remediation methods, phytoremediation requires considerable It takes a long time (decades or even hundreds of years) and there are problems with the treatment of plants; electrokinetic remediation is only suitable for small areas of pollution, and it is not easy to operate on site; the leaching method needs to add surfactants, which has the risk of polluting groundwater; thermal The desorption method is a method of recovering gas by heating, which is not suitable for on-site operation, high cost, and narrow scope of application; the vitrification method changes the properties of the soil and is only suitable for serious pollution and small areas; adding lime Stabilization methods increase soil pH, cause soil compaction, and do not work well on alkaline soils

Therefore, it is not suitable for the treatment of heavy metal pollution in large-scale paddy fields.

Images