7 results about "Selenium pollution" patented technology

The invention relates to the technical field of microbiology and selenium polluted environment restoration, and provides an ensifer morelensis R2-120 strain and an application thereof. The bacterial strain R2-120 is ensifer morelensis capable of efficiently synthesizing volatile selenium, and the preservation number of the bacterial strain R2-120 is GDMCC No: 63730. The strain R2-120 has relatively strong tolerance to selenate and selenite, and a plate test shows that the R2-120 can tolerate at least 200 mM of selenate and 60 mM of selenite. The strain R2-120 can metabolize selenite and convert the selenite into nano-selenium, and can convert the selenite and the nano-selenium into volatile selenium. The invention also establishes a method for removing selenium in the water body by using R2-120 in the bioreactor, and the method can be used for bioremediation of selenium-polluted water body and soil, treatment of selenium-containing wastewater and recycling of selenium, and has a wide application prospect.

This invention discloses a Ni 0 / Fe 0 This invention relates to zinc sulfide-loaded composite materials, their preparation methods, and applications, belonging to the field of environmental functional nanomaterials. The preparation method includes: dissolving zinc and sulfur precursors in a solvent to obtain ZnS nanosheets via a hydrothermal method; dispersing ZnS, iron, and nickel precursors in deionized water to form a mixed dispersion under an inert atmosphere; and adding sodium borohydride solution dropwise to the mixed dispersion to allow Ni to... 2+ and Fe 2+ In-situ reduction was performed on the zinc sulfide surface; after the reaction was completed, Ni was obtained through solid-liquid separation, washing, and freeze-drying. 0 / Fe 0 -ZnS composite material. This material can reduce Ni 0 and Fe 0 The aggregation of particles increases the exposure of surface active sites, and through the sulfur sites on the ZnS surface, the reduction activity of zero-valent metals and the bimetallic electron transfer effect, it can achieve the adsorption, reduction and fixation of uranium and selenium pollutants, which is suitable for the treatment of selenium-containing water bodies and water bodies with uranium and selenium coexistence.

The application discloses a preparation method of iron modified malus micromalus crabapple biochar based on malus micromalus crabapple waste and application thereof. The preparation method of the malus micromalus crabapple iron modified biochar comprises two steps of carbonization and modification. The malus micromalus crabapple litter waste is subjected to oxygen-limited heating carbonization to prepare carbonized materials, and then is subjected to acid pickling and iron modification to prepare the iron modified malus micromalus crabapple biochar. The prepared biochar has high adsorption capacity for selenium in water, has the function of holding selenium in selenium-rich soil, can simultaneously passivate harmful heavy metals in soil, and has the functions of controlling the release of selenium in water and improving soil quality. The application not only provides a new way for resource utilization of the malus micromalus crabapple litter, but also provides an efficient technology for water selenium pollution treatment, soil selenium holding and heavy metal soil fixation, and achieves the effect of turning waste into treasure.

The present invention relates to methods for biological wastewater treatment for Se control in Se-laden wastewater. The Se contaminants in the wastewater include the Se oxyanions selenate (SeO42−) and selenite (HSeO3−), which are biochemically reduced and transformed to elemental selenium (Se0) by microorganisms through anaerobic biological reduction. The resulting Se0 is entrained in the biomass, which is further processed to enable the efficient recovery of concentrated Se0.

The invention provides preparation of a selenium-water-soluble high-molecular polysaccharide hydrogel and use thereof. The preparation method includes: (1) water solution of polysaccharide and seleno-compound was prepared by heating the mixture with stirring; and (2) the solution was cooled with standing within shaped container to obtain the selenium-polysaccharide composite hydrogel. Plant seeds are sown on the surface of the composite hydrogel and cultivated to obtain selenium-rich plants. Shape-controllable hydrogel could be prepared by recycled hydrogel through high-temperature dissolution followed with cooling to realize the effective utilization of selenium in the hydrogel. Compared with the traditional selenium enrichment method, current method showed advances in prevent of selenium pollution, which normally caused by the application of selenium fertilizers.

The application provides a biochar modifier for reducing plant mercury and soil methylmercury, and a preparation method and application thereof. The biochar modifier provided by the application comprises biochar loaded with selenium and phosphorus. The preparation method of the biochar modifier comprises the following steps: dipping biochar into a solvent containing a selenium modifier and a phosphorus modifier and reacting, and then performing solid-liquid separation on the reaction solution to obtain a solid phase; and the solid phase is dried to obtain the biochar modifier. The biochar modifier provided by the application has a remarkable effect of reducing plant mercury and soil methylmercury, has a simple preparation process, does not cause secondary selenium pollution, and is easy to popularize.

This invention discloses *Comamonas* sp. strain S1-158 and its applications. Strain S1-158 is a new species of *Comamonas* sp. capable of efficiently synthesizing volatile selenium, with accession number GDMCC No: 63731. The *Comamonas* sp. strain S1-158 of this invention exhibits strong tolerance to selenate, selenite, and elemental selenium, and can efficiently convert selenite and elemental selenium into volatile selenium. A method for the large-scale preparation of methylselenic acid using a bioreactor has also been established, which can be used for the treatment of selenium-containing wastewater and the bioremediation of selenium-polluted environments, showing broad application prospects.