31 results about "Selenium pollution" patented technology

The invention relates to a comprehensive treatment method and device for Se-containing wastewater. Two stages of reactors are adopted, the Se-containing wastewater enters a second reactor firstly andis subjected to a reaction with sulfur-containing flue gas, SO2 in the flue gas is removed, and purified gas is discharged; effluent of the second reactor enters an anaerobic reactor, and selenate ions in the wastewater are reduced into selenite ions; effluent of the anaerobic reactor returns to a first reactor and is subjected to a reaction with the flue gas, and the selenite ions are removed; effluent of the first reactor enters an aerobic reactor, and effluent of the aerobic reactor is subjected to flocculating sedimentation, solid-liquid separation is performed, and a product is discharged. The Se-containing wastewater is treated by the sulfur-containing flue gas, so that the Se-containing wastewater and the sulfur-containing flue gas are treated efficiently simultaneously, waste is treated by waste, treatment cost of the Se-containing wastewater is reduced, the removal rate for Se pollutants in the wastewater is higher than 95%, and content of SO2 in the sulfur-containing flue gasis lower than 20 mg / L.

The invention discloses a method for carrying out uniform selenium-enriched cultivation of pleurotus geesteranus by using selenium yeast, which is characterized by comprising steps of mixing a selenium-enriched cultivation material additive of which the weight is 1-10 percent of the total weight of a cultivation drier into the cultivation drier and carrying out cultivation according to a common cultivation method to obtain the uniform selenium-enriched pleurotus geesteranus, wherein the total content of selenium in the selenium-enriched cultivation material additive is in the range of 5-200mg / kg; the diameters of particles in the selenium-enriched cultivation material additive are distributed in a multiple diameter region mode in the range of 0.005-5.0mm; the weight of the particles with the diameter in the range of 1.0-5.0mm is at least 10 percent of the total weight of the additive; the weight of the particles with the diameter in the range of 0.005-0.1mm is at least 40 percent of the total weight of the additive; and the selenium-enriched cultivation material additive comprises the following composition raw materials in parts by weight: 100 parts of maize cob meal and 0.45-18 parts of selenium yeast. The pleurotus geesteranus obtained by using the method has high selenium utilization rate and stable selenium content between batches. Moreover, the method has no hidden dangerof selenium pollution and is convenient to operate and easy to popularize.

The invention belongs to the technical field of microbiology, in particular to a selenium-resistant strain Enterobacter ludwigii GX-C3 and its application. A selenium-tolerant strain Enterobacter ludwigii GX-C3, whose taxonomic name is Enterobacter ludwigii, was deposited in the Guangdong Provincial Microbial Culture Collection Center on December 10, 2020, and the deposit number is GDMCC No.61358. The selenium-resistant strain Enterobacter ludwigii GX-C3 strain of the present invention has a maximum removal rate of 46.76% of selenium in soil at a selenium concentration of 2000 μg / mL. The results can provide bacterial resources for bioremediation in selenium-contaminated areas, and provide reference for the development and utilization of selenium resources.

The invention discloses a treatment method and device for synchronously removing selenium pollution and sulfide pollution, belonging to the technical field of environmental protection wastewater treatment. The treatment method for simultaneous removal of selenium pollution and sulfide pollution is as follows: selenate ions (SeO 4 2‑ ) reduced to selenite ion (SeO 3 2‑ ); the intermediate collection device collects the selenium-containing wastewater after the reaction through the membrane; the pH adjustment device adjusts the pH of the selenium-containing wastewater after the reaction; the selenium-containing wastewater after adjusting the pH enters the reaction device and reacts with the sulfide-containing wastewater, and removes it synchronously Selenium and sulfur pollutants; the final collection device collects the post-reaction wastewater. The method of the invention can use the sulfide-containing wastewater to treat the selenium-containing wastewater, realizes waste treatment with waste, high removal rate of selenium and sulfur, low carbon source consumption, and simple operation.

The invention discloses a method for cultivating organic selenium-enriched edible or tea water lilies, belonging to the technical field of aquatic plant cultivation. Through the selection of water lily varieties, the cultivation methods of direct pond planting and potted plant submersion are realized by using the planting pond and potting container at the same time, and the optimal deployment of selenium-rich bio-organic fertilizer and soil is applied to the planting pond and potting container, and then through further Water level control and topdressing, maintenance and management, thus cultivated to obtain organic selenium-enriched water lilies for food or tea. The invention realizes the acquisition of pure natural organic selenium-enriched edible or tea water lilies in a simple and efficient manner, improves the edible and tea value of water lilies, and at the same time solves the problem that the existing cultivation methods easily cause selenium pollution and the cultivation workload is large , high cost and low work efficiency.

The invention discloses a method for culturing pleurotus geesteranus uniformly rich in selenium by using selenium-enriched crop stalks. The method is characterized by comprising the steps of: mixing selenium-enriched culture material additive in an amount which is 1 to 10 percent of the total weight of a dry culture material in the dry culture material, and culturing according to the common culture method to obtain the pleurotus geesteranus uniformly rich in selenium, wherein the selenium-enriched culture material additive has the total selenium content of 5 to 50mg / kg; the particles with theparticle size of 0.005 to 5.0mm in the selenium-enriched culture material additive are in multi-particle-size regional distribution, and particles with the particle size of 1.0 to 5.0mm at least account for 10 percent of the total weight of the additive; particles with the particle size of 0.005 to 0.1mm at least account for 40 percent of the total weight of the additive; and the selenium-enriched culture material additive comprises the following components in percentage by weight: 30 to 70 percent of selenium-enriched wheat stalk powder and 30 to 70 percent of selenium-enriched cornstalk powder. The pleurotus geesteranus prepared by the method has high utilization rate and stable selenium content in different batches; in addition, by the method, selenium pollution is avoided, and the method is easy to operate and easy to promote.

The invention relates to a zinc-iron-selenium-rich pollution-free organic compound fertilizer. The zinc-iron-selenium-rich pollution-free organic compound fertilizer is characterized by being prepared from the following materials in parts by weight: 80-100 parts of agricultural wastes, 20-30 parts of wild peppers, 20-30 parts of gingko seed coats, 20-30 parts of fructus cnidii and the like. Compared with the prior art, the zinc-iron-selenium-rich pollution-free organic compound fertilizer has the advantages of being good in weeding effect, safe to environment, unlikely to generate weed drug resistance and the like, and is extensive in application prospect.

The invention relates to a treatment method for SO2-containing flue gas and a treatment device. A double-section flue gas desulfurization reactor is adopted, the flue gas enters the first-section reactor and is subjected to a reaction with Se-containing wastewater discharged by an acidification reactor, and selenite ions are removed; the flue gas enters the second-section reactor and is directly subjected to a reaction with the Se-containing wastewater, SO2 in the flue gas is removed, and purified gas is discharged; effluent of the second-section reactor enters the acidification reactor, acidification pH is controlled at 2-6, and selenate ions are reduced into the selenite ions; effluent of the acidification reactor enters the first-section reactor and is subjected to a reaction with the flue gas, and the selenite ions are removed; effluent of the first-section reactor enters an aerobic reactor, and ammonia nitrogen, COD and remaining Se pollutants in the wastewater are removed; effluent of the aerobic reactor enters a flocculating sedimentation tank for treatment. The Se-containing wastewater is taken as a desulfurization absorption liquid, so that the Se-containing wastewater andthe SO2-containing flue gas are treated efficiently simultaneously, waste is treated by waste, and the economic benefits are increased greatly.