3results about How to "Reduce mercury levels" patented technology

This invention discloses a method and microbial preparation for controlling mercury accumulation in rice grains using Metarhizium anisopliae colonization, belonging to the field of agricultural environment and microbiology technology. The method involves inoculating rice plants with Metarhizium anisopliae spores, followed by planting the rice in mercury-contaminated paddy fields; water management is implemented throughout the rice's growth cycle until harvest. This invention establishes a complete microbial remediation system for mercury contamination in paddy fields, providing not only a method for the colonization and application of Metarhizium anisopliae in mercury-contaminated environments, but also ensuring safe rice production, offering a feasible approach to safeguarding food security and human health.

A field placing method for reducing mercury content of brown rice in a light and moderate mercury pollution rice field comprises the steps that after rice transplanting is conducted for 30-40 days, intermittent field placing is started at the last tillering stage, no matter whether rainfall exists or not, it is guaranteed that the total drying day number reaches 10 days, and the field placing degree is based on farmland cracks, rice leaves stretch upwards in a sword shape and touch and prick hands slightly; after the ripening period is finished, field placing is conducted, irrigation is stopped, and the rice field naturally falls dry; water is controlled in the growth period, wherein wet irrigation is carried out from the heading period to the end of grouting, and the irrigation water layer does not exceed 2 cm every time. The field placing method provided by the invention not only is an environment-friendly agricultural practice, but also shows a remarkable synergistic effect in the aspects of guaranteeing grain safety and improving rice quality, and provides a new thought and an effective way for solving the problem of heavy metal pollution in rice production.

The invention belongs to the technical field of gold smelting, and provides a method for reducing the mercury content in a gold smelting pregnant solution. The method comprises the following steps: firstly, measuring the mercury content in a gold smelting pregnant solution to be treated, then sequentially adding sodium diethyldithiocarbamate and a composite sulfur slow-release agent into the pregnant solution, and reacting for 2-4 hours under the conditions that the reaction temperature is controlled to be 25-35 DEG C and the stirring speed is 150-250 revolutions per minute; the composite sulfur slow-release agent is prepared from calcium sulphoaluminate, modified silica gel and a carbon nano-tube; and finally filtering and separating the pregnant solution. A novel composite sulfur slow-release agent is adopted, the slow-release agent can intelligently regulate and control the release rate of sulfur ions according to the ion concentration environment in the pregnant solution, meanwhile, a specific ion selectivity accelerant is added, the sulfur ions are accurately guided to be preferentially combined with mercury for precipitation, and therefore the mercury content is efficiently reduced on the basis that the extraction rate of gold and silver in the pregnant solution is not affected.