10 results about "Biological oxidation" patented technology

This disclosure relates to a desulfurization method for sulfur-containing wastewater, comprising the following steps: the sulfur-containing wastewater is introduced into an anaerobic biological unit for sulfate reduction treatment to obtain reduced wastewater; the reduced wastewater and oxygen-containing gas are introduced into a hydrogen sulfide stripping unit for stripping treatment to obtain hydrogen sulfide gas products and stripped water; the stripped water is introduced into a water quality stabilization unit for activated carbon adsorption treatment to obtain purified water; the hydrogen sulfide gas products and air are introduced into a biological oxidation unit for hydrogen sulfide oxidation treatment to obtain elemental sulfur and tail gas; the tail gas obtained from the biological oxidation unit is introduced into a tail gas treatment unit, where it undergoes sequential water vapor removal treatment, activated carbon adsorption treatment, and photocatalytic oxidation treatment to obtain purified tail gas. This disclosure enables efficient treatment of high-concentration sulfate wastewater and the recovery of elemental sulfur.

The invention relates to a biofilter and a method for the oxidation of methane generated in industrial, agricultural and sanitary landfill processes, among others, where the methane oxidation is biological, requiring methanotrophic microbial consortia, and where copper mining tailings are added to stimulate methane oxidation mediated by said methanotrophic microorganisms.

This invention relates to the fields of environmental engineering and pollution remediation technology, and in particular to a bioelectrochemical system for the remediation and fixation of heavy metal pollution in groundwater and its application. The bioelectrochemical system employs an integrated columnar layered structure simulating vertical seepage of groundwater, comprising, from bottom to top: a groundwater inlet zone, a first transition support layer, an anodic reaction zone, an intermediate isolation layer, and a cathodic reaction zone. Electroactive microorganisms in the anodic zone oxidize organic matter, releasing electrons. These electrons are transferred to the cathode via an external circuit, driving the reduction of heavy metal ions (such as Cr(VI)) to a lower valence state, while pyrite releases Fe. 2+ Biochar promotes precipitation by enhancing fixation through adsorption and electron shuttle. This bioelectrochemical system enables continuous in-situ remediation of groundwater, achieving a Cr(VI) removal rate of up to 92.7%, while simultaneously removing organic matter and nitrogen and phosphorus pollutants. It exhibits stable long-term operation with a low risk of heavy metal re-release, requires no large amounts of chemical reagents or external power supply, and has low operating costs.

The utility model discloses a tail gas purification treatment device of biological oxidation gold extraction relates to tail gas purification treatment device technical field, the utility model discloses a main frame mechanism, the main frame mechanism includes the purification tower, the left side fixedly connected with the air inlet pipeline of purification tower outer surface, the top fixedly connected with the exhaust pipe of purification tower, the bottom fixedly connected with the deflector of purification tower inside, the utility model discloses a purification subassembly is set up, specifically is through setting up multilayer carbon filling layer, and carbon filling layer adopts the mixture of active carbon and modified molecular sieve, can increase the contact area and contact time of tail gas and absorption liquid and adsorbent, improve the removal efficiency to harmful gas, simultaneously, sodium hydroxide and hydrogen peroxide in absorption liquid can carry out chemical reaction and oxidation decomposition to different properties harmful gas, thereby realize the efficient purification to multiple harmful gas, effectively reduced the emission concentration of harmful substance in tail gas, and the environmental protection emission standard has been greatly improved.

The application provides a method for accelerating green bio-oxidation of arsenic pyrite by using reinforced bentonite medium, and belongs to the technical field of sulfide ore metallurgy. First, acidophilic leaching bacteria with good arsenic tolerance are cultivated, and then a bentonite-microorganism-arsenic pyrite synergistic oxidation system is established to accelerate bio-oxidation and dissolution of arsenic pyrite. Because of the unique physical and chemical properties (such as layered structure, good ion exchange performance, etc.), the bentonite can not only provide an attachment site for the adsorption of bacteria on the surface of arsenic pyrite, but also has a certain catalytic effect on the Al 3+ and other active groups released by the dissolution of the bentonite, which effectively promotes the bio-oxidation and dissolution of arsenic pyrite. The process is simple, efficient and requires low equipment, and can effectively avoid the high cost and environmental pollution problems caused by traditional pyrometallurgical and hydrometallurgical processes.

This invention discloses a method and its application for regulating the oxidation and arsenic speciation transformation of arsenopyrite. The method involves sequentially adding arsenopyrite and pyrrhotite to an acidic, iron-free medium with an initial pH of 2.0 to form a protective galvanic cell coupling, followed by inoculation with *Thiobacillus ferrooxidans* and a shaking reaction. By adjusting the ratio of arsenopyrite to pyrrhotite and the addition of *Thiobacillus ferrooxidans*, the method achieves precise regulation of the oxidation of arsenopyrite and the arsenic speciation transformation through phased changes in arsenic release behavior and the As(III) / As(V) ratio. This method possesses dual application value in resource utilization and environmental remediation, and can be applied to the optimization of pretreatment processes for the biological oxidation of gold-bearing arsenic ores or the control of arsenic pollution migration and transformation in acidic mine wastewater, tailings heap leaching, and arsenic-containing sulfide ore coexisting scenarios.

This invention discloses a device for simultaneous treatment and hydrogen production of organic wastewater based on microbial electrochemistry, relating to the fields of water pollution control and energy recovery technology. Specifically, it is a device for simultaneous treatment and hydrogen production of organic wastewater based on microbial electrochemistry. The device includes, in sequence, a wastewater pretreatment module, an anode biological oxidation module, an ion conduction module, a cathode catalytic reduction module, a gas collection and separation module, and an energy regulation and intelligent feedback control module. After pretreatment, the wastewater enters the anode chamber, where electrogenic bacteria oxidize organic matter, releasing protons and electrons. Electrons are transferred to the cathode via an external circuit, where a catalyst reduces water to produce hydrogen. An ion exchange membrane ensures the directional migration of protons. The system uses an intelligent module to monitor water quality and operating parameters in real time, dynamically adjusting voltage and influent load to achieve efficient and stable hydrogen production and wastewater purification.

The utility model discloses a kind of microbial screening enrichment devices of biological oxidation gold extraction, it is related to microbial screening enrichment technical field, including main frame mechanism, main frame mechanism includes stirring leaching cabin, the left side of stirring leaching cabin is fixedly connected with drain, the top of the outer surface of stirring leaching cabin is fixedly connected with fixed ring, top is provided with cover, cover bottom and fixed ring top contact, stirring leaching cabin inside is provided with stirring assembly, stirring leaching cabin bottom is provided with filter component, the utility model has the technical effect of stirring, vibration screening, specifically is that starting motor rotates through shaft gear one, simultaneously with gear one rotation, it can be rotated by several gear two to drive several rotating rods, several stirring vanes inside stirring leaching cabin can be rotated by rotating rod to fully stir microorganism, ore and solution inside stirring leaching cabin, avoid local microorganism concentration too high or too low, to ensure that oxidation reaction is efficiently carried out in each part.

The application discloses a low-shear external circulation micro-bubble generating device and method suitable for a biochemical system and belongs to the technical field of aerobic biochemical reactions. The method comprises the steps of strain culture, ore pulp preparation, reaction system adjustment, micro-bubble aeration reaction and solid-liquid separation. The device is combined by a micro-bubble aeration head and an external circulation sleeve and is used for aeration. The micro-bubble aeration head adopts an upper gas outlet structure, and the gas-liquid flow direction is vertical. The external magnetic force pump is connected in a low-shear mode to form ore pulp external circulation, and the mild entrainment of micro-bubbles is realized. The device comprises a micro-bubble aeration head, an external circulation sleeve and an external magnetic force pump, and all the components are detachably connected. The application can significantly improve the gas-liquid mass transfer efficiency under the premise of protecting the activity of microorganisms, simultaneously improve the total arsenic and total iron leaching rates of refractory gold mines, and is especially suitable for high solid content gas-liquid-solid three-phase aerobic biochemical systems such as biological oxidation of refractory gold mines, can shorten the reaction period and reduce the operation cost.