66 results about "Biological oxidation" patented technology

The invention discloses a method for synergistically enhancing biological oxidation of arsenopyrite by utilizing symbiotic minerals, which particularly comprises the following steps: adding a certain amount of pyrite into an arsenopyrite biological oxidation system, and improving the quantity and activity of acidophilic thiobacillus ferrooxidans by utilizing chemical change of a solution generated by oxidation of the pyrite. The mineral leaching capability of the functional microorganisms is optimized; meanwhile, under the dual action of pyrite and microorganisms, the content of Fe < 3 + > in the solution is remarkably increased, and the Fe < 3 + > serves as a main oxidizing agent for oxidizing arsenopyrite; due to the difference between the surface potentials of the pyrite and the arsenopyrite, a galvanic couple effect is formed between minerals, the electron transfer efficiency between the arsenopyrite and the oxidizing agent is accelerated, and finally the purpose of improving the leaching rate of the arsenopyrite in a biological system is achieved; according to the method, the leaching rate of arsenic in an arsenopyrite biological oxidation system is increased by nearly 8 times at most, the reinforcing effect on arsenopyrite oxidation is remarkable, and meanwhile the method is simple in process, mild in condition, easy and convenient to operate and low in cost.

The utility model belongs to the technical field of biological denitrification of industrial aquaculture water, and particularly relates to a denitrification device suitable for an industrial aquaculture system. Comprising an aerobic nitrification zone, a carbon source zone, an aerobic denitrification zone and a suspended particle removal zone which are communicated in sequence, a filter material is arranged in the aerobic nitrification zone, and the aerobic nitrification zone is used for carrying out biological oxidation on aquaculture water to generate nitrate; the upper part of the carbon source region is filled with carbon sources; the aerobic denitrification area is used for reducing nitrate in the water body into nitrogen; the suspended particle removal area is used for removing suspended particles in the water body. A water inlet pipe is arranged at the bottom of one side wall of the aerobic nitrification area, an aerobic nitrification area overflow port is formed in the upper part of the other side wall of the aerobic nitrification area, and the internal space of the aerobic nitrification area is distributed in a shape; a water outlet pipe is arranged at the bottom of the side wall of the suspended particle removal area. According to the device, aerobic nitrification, aerobic denitrification and suspended particulate matter removal are organically integrated, intensification and modularization are realized, the device is simple in structure and convenient to operate, and the culture denitrification effect is effectively improved.

The invention relates to the technical field of water treatment and resource recovery, in particular to a high-iron-content acid mine water treatment and recycling method based on immobilized biological oxidation and fractional precipitation, which comprises the following steps: S1, a bacterial immobilization stage; s2, an immobilized biological oxidation stage; and S3, a fractional precipitation stage. The method is high and stable in treatment efficiency, bacteria are firmly fixed on a carrier by adopting a bacteria immobilization technology, the loss of the bacteria is avoided, and the biomass and the metabolic activity are improved; waste recycling is achieved, the sludge yield is low, secondary pollution is avoided, the technology is coupled and innovated, and the reactor is reasonable and efficient in design.

The invention discloses a method for efficiently extracting and recovering valuable elements from tailings. The method comprises the steps of gradient crushing-morphology separation, rotational flow reselection-flotation coupling, enhanced alkaline leaching, biological oxidation-acid leaching collaboration, membrane electrolysis enrichment, extraction resin deep recovery and tail water zero discharge treatment. According to the method, metal is pre-enriched through gradient crushing-morphology separation; after rotational flow classification, minerals of different size fractions are recycled through gravity separation and flotation; metal with different chemical forms is dissolved through three-stage synergism of alkaline leaching, biological oxidation and acid leaching; selective deposition of valuable metal in the solution is realized through membrane electrolysis; adsorbing and recovering rare earth by using extraction resin; and tail water closed-loop treatment. According to the method, the aim of multi-element collaborative recovery is achieved, meanwhile, the recovery rate of coarse-grain gold is increased, meanwhile, high-temperature roasting is replaced with biological oxidation, energy consumption is reduced, full recycling of waste water can be achieved, and the method is quite suitable for efficient recovery of valuable elements in metal mine tailings.

The invention provides a preparation method of a debris flow protection engineering self-repairing concrete part by using microorganisms and magnesium oxide, which comprises the following steps: S1, dipping a porous aggregate base material with the particle size distribution of 1-5mm in a urease-producing microbial agent, and enabling urease-producing microorganisms in the urease-producing microbial agent to fully enter pores of the porous aggregate base material; s2, urea and magnesium oxide are added into the urease-producing microbial agent impregnated with the porous aggregate base material to obtain a mixed solution, the mixed solution is maintained for 2-5 days, the self-repairing aggregate with the particle size distribution ranging from 2 mm to 10 mm is obtained, urea, urease-producing microorganisms, magnesium oxide and water react with one another in the maintenance period, a hardened shell wrapping the outer surface of the porous aggregate base material is generated, and the self-repairing aggregate with the particle size distribution ranging from 2 mm to 10 mm is obtained. Urea and urease-producing microorganisms are retained in pores of the porous aggregate base material, and the hardened shell comprises brucite, basic magnesium carbonate and magnesium oxide which is not completely reacted; and S3, mixing the self-repairing aggregate with the debris flow protection material, and curing to obtain the debris flow protection engineering self-repairing concrete piece utilizing the microorganisms and the magnesium oxide.

The present application belongs to the technical field of wastewater treatment, and discloses a method for treating electroplating wastewater by using bioreduction of biogas slurry and combined iron bio-oxidation, which is a secondary combined use technology for removing various heavy metals in electroplating wastewater by iron bio-oxidation, comprising the following steps: (1) collecting fermentation biogas slurry, and performing ultraviolet irradiation sterilization after aeration; (2) adding potassium dichromate solution and fresh nutrient solution to the sludge system, and culturing anaerobic sludge; (3) adding treated biogas slurry to the anaerobic sludge, and repeatedly domesticating chromium-reducing microorganisms; (4) configuring a mixed solution of comprehensive electroplating wastewater and biogas slurry according to a certain proportion; (5) building a primary treatment biological reactor, and reducing Cr(VI) in wastewater by anaerobic biological reduction under the promotion of pyrite; and (6) building a secondary biological reactor filled with straw biomass charcoal, and generating iron oxides under the action of functional bacteria to continue adsorbing Cd, Cu and Ni ions in wastewater.

The utility model relates to a high COD (Chemical Oxygen Demand) organic wastewater treatment system which comprises a biological oxidation tank, the biological oxidation tank comprises an inner cylinder body and a jacket cylinder body arranged outside the inner cylinder body, a water inlet is formed in the lower part of the jacket cylinder body, and a water outlet is formed in the upper part of the jacket cylinder body; a first discharge port is formed in the bottom of the inner cylinder body, an air inlet, a sampling port and a plurality of detection ports are formed in the side wall of the inner cylinder body, an upper flange cover is detachably and fixedly arranged at the top of the inner cylinder body, and an exhaust port, an inoculation port and a plurality of material supplementing ports are formed in the upper flange cover; the air inlet is connected with an aeration disc positioned at the bottom of the barrel body of the inner barrel through a breather pipe; and a stirring mechanism is arranged in the middle of the inner cylinder body. The high-COD organic wastewater treatment system is high in COD removal treatment efficiency, high in impact resistance, good in biodegradability, low in cost and small in investment, and has obvious environmental benefits and wide application prospects.

The invention discloses a method for green and efficient recovery of gold from refractory gold ore. The green and efficient gold recovery method for the refractory gold ore comprises the following steps that biological oxidation pretreatment is conducted on the refractory gold ore, and biological oxidation ore pulp is obtained; adjusting the pH value of the biological oxidation ore pulp, standing for 1-3 days to carry out bacterial inactivation on the biological oxidation ore pulp, then adding a proper amount of iron-based ligand to adjust the potential of the biological oxidation ore pulp to a proper range, and then adding a proper amount of thiosulfate to carry out in-situ leaching to obtain leached ore pulp; and the leaching ore pulp is filtered and separated, and gold leaching liquid and leaching residues are obtained. According to the method for green and efficient gold recovery from the refractory gold ore, a biological oxidation pretreatment method and a weakly acidic iron-based thiosulfate in-situ leaching process are combined, acid-base conversion of ore pulp is not needed, and green and efficient leaching of gold in the refractory gold ore can be achieved with the low production cost and the short process.

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.

A method for recovering nutrients from wet animal manure, the method comprising adding acid to wet manure (1) to lower the pH value of the wet manure to provide acidified wet manure; adding a polyelectrolyte to the acidified wet manure to obtain granulated wet acidified manure (5b); conveying the granulated wet acidified manure continuously into a liquid-solids separator (6) to separate a liquid manure fraction (16) and a solid manure fraction (7); providing a water purification apparatus (9) comprising an electrolytic cell (21), and a substantially vertical separator tower (20) arranged in a flow connection with the upper part of the electrolytic cell (21), conveying the liquid manure fraction to the electrolytic cell (21), operating the electrolytic cell (21) to produce an accumulating floc; conveying the raising floc into the separator tower (20), wherein the floc (19) is separated by expelling from the top of the separator tower (15), and conveying the solid manure fraction (7) and the floc (19) to an aerated bio-oxidizer device (8) to provide oxidized manure; discharging the oxidized manure (10) from the bio-oxidizer device. A system for recovering nutrients from wet animal manure. A fertilizer product (12) comprising nitrogen, phosphorus and potassium encapsulated in spores of Thermoactinomyces. Use of Thermoactinomyces for producing organic fertilizer. Use of a water purification apparatus for treating wet animal manure. Use of a continuously operating aerated bio-oxidizer device.

The present disclosure discloses a method for strengthening a biological manganese oxidation using a magnetic field and use thereof. The method includes steps of inoculating a manganese-oxidizing microorganism into a culture medium containing Mn2+, performing magnetization treatment in a culture process, and then collecting a biogenic manganese oxide. The method includes steps of performing a primary magnetic field treatment at a magnetic field intensity of 0.2-50 mT for 1-5 h when culturing is performed for 6-12 h, continuing culturing after the primary magnetization treatment, and performing magnetization treatment once every other 24 h for culture time of 72 h. A magnetic field is applied to accelerate an oxidation rate of a manganese-oxidizing microorganism to Mn2+ and a biological manganese oxidation rate is respectively improved by 36.4% and 23.8% under an action of an alternating magnetic field or a constant magnetic field within 72 h.

The utility model discloses a biological treatment device for acid mine wastewater. The biological treatment device comprises a connecting pipe, a peristaltic pump, an aeration device with an air compressor and an aeration pipe, a biological oxidation component, a biological reduction component, a water outlet tank and a water inlet tank, the biological oxidation part consists of an AMD tank, a peristaltic pump, a biological oxidation reactor, an iron precipitation reactor, a settling tank and a connecting pipe; the biological oxidation reactor is filled with biological filler, is provided with an aeration device, enters from the lower part and exits from the upper part and is beneficial to growth and attachment of microorganisms; the iron precipitation reactor is provided with a stirring device and can adjust the pH value of a solution; the settling tank is used for solid-liquid separation after an iron precipitation reaction and clarification of the solution; the biological reduction part consists of three peristaltic pumps, a biological reduction reactor 7 capable of realizing internal water circulation, heating, temperature measurement, sampling and bacterial liquid addition, two peristaltic pumps, two connecting pipes, three connecting pipes and a water outlet tank for solid-liquid separation and solution clarification; and the wastewater subjected to biological oxidation treatment is received by the water inlet tank and then flows to biological reduction for continuous treatment. The device has the advantages of purifying water and recycling Fe and Cu under the condition of low loss of Cu with low pH value, and being high in cost performance and the like.

This invention discloses a method and application for treating polyoxymethylene (POM) wastewater, belonging to the field of wastewater treatment technology. The method first involves adding hexadecyltrimethylammonium bromide and ethanol to the wastewater in an anaerobic environment to form micelles that encapsulate POM, and then utilizing anaerobic bacteria to degrade formaldehyde and macromolecular organic matter. Next, the anaerobic effluent is introduced into a facultative anaerobic environment, where a continuous linear decrease in pH triggers the staged disintegration of the micelles, releasing POM. Simultaneously, acclimation bacteria are added in stages according to pH changes to dynamically degrade the released formaldehyde. Finally, complete mineralization is achieved through two-stage biological oxidation in an aerobic environment. This invention blocks the random depolymerization of POM through spatial encapsulation and controls the release rate through sequential acidification, achieving a dynamic balance between formaldehyde formation and biodegradation. This effectively avoids the inhibition of microorganisms by toxicity peaks, significantly improving the removal efficiency of formaldehyde and organic pollutants and the stability of system operation.

The invention discloses a biological oxidation process intelligent optimization method based on a control model, and relates to the technical field of biological oxidation process control, and the method comprises the steps: constructing a biological oxidation coupling deviation operator and a liquid level overflow risk operator based on a biological oxidation process smooth monitoring sequence set, and generating a control response factor group, forming a biological oxidation process control model; performing stability statistical processing on the biological oxidation coupling deviation operator and the liquid level overflow risk operator to form a biological oxidation coupling deviation operation threshold value group and a liquid level operation state threshold value group, dividing operation states, and generating a biological oxidation process intelligent optimization control instruction in combination with a biological oxidation process control model; the biological oxidation process intelligent optimization control instruction is issued to an execution mechanism to complete adjustment, biological oxidation process monitoring data are collected again, a new biological oxidation coupling deviation operator and a new liquid level overflow risk operator are generated, and the biological oxidation process control model is corrected.

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 scintillation liquid supply device of a biological oxidation combustion instrument in the field of radioactive test analysis, which comprises a mixed scintillation liquid bottle made of glass, a bottle cap made of rubber is arranged at a bottle opening of the mixed scintillation liquid bottle, and a liquid outlet of the mixed scintillation liquid bottle is communicated with the mixed scintillation liquid bottle. A main liquid supply pipe, a gas pipe and a liquid adding pipe which are made of quartz materials are respectively inserted into the mixed scintillation liquid bottle, the main liquid supply pipe, the gas pipe and the liquid adding pipe penetrate through the bottle cap, the upper ends of the main liquid supply pipe, the gas pipe and the liquid adding pipe extend out of the bottle cap, a one-way valve is arranged at the extending end of the gas pipe, and a one-way check valve is arranged on the liquid adding pipe extending out of the bottle cap. According to the utility model, the scintillation liquid can be prevented from being polluted by a plastic material, and the liquid supply pipe made of the quartz material is corrosion-resistant, non-discoloring, stable and reliable; radioactive test pungent odor generated during preparation and transfer of the mixed scintillation liquid is avoided, and the health of experiment operators is protected.

The invention relates to an arsenic-gold dissociation optimization treatment device and method for arsenic-gold ore, and belongs to the technical field of gold ore treatment.The multiple sensors are arranged in a reaction chamber of the arsenic-gold dissociation optimization treatment device for the arsenic-gold ore, and multi-source data information is collected through the multiple sensors; a digital twinborn body is formed through the mechanism model layer, the data driving model layer and the high-fidelity simulation layer, so that process states under different control parameter combinations within a preset time are predicted in a virtual space, and the maximum arsenic oxidation rate and flora activity optimal interval are solved based on a genetic algorithm; and calculating an optimal control instruction set, and performing control optimization based on the optimal control instruction set. According to the method, the virtual-real interactive digital twinborn system is constructed, and the genetic algorithm is fused for dynamic optimization, so that accurate prediction and real-time optimization of the biological oxidation process are realized, the arsenic and gold dissociation degree in the arsenic-containing gold ore is improved, and the preparation purity of the gold ore is improved.

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.

This invention relates to a process for treating organic wastewater containing particulate pollutants. The process involves sedimentation and separation of organic wastewater to obtain primary organic wastewater. This primary organic wastewater is then treated in conjunction with ROS aeration and ultrasonic processes. This combination increases the active oxygen content of the primary organic wastewater. The cavitation bubbles generated by the ultrasonic waves break up suspended microparticles in the primary organic wastewater and initiate the initial oxidation of recalcitrant organic matter. Simultaneously, the bubbles generated by aeration enhance the ultrasonic cavitation effect, increasing the concentration of hydroxyl radicals in the primary organic wastewater and significantly improving its oxidizing power. This effectively pre-treats the organic wastewater and improves the water quality stability during the targeted biological purification stage. Consequently, when the resulting secondary organic wastewater undergoes targeted biological purification, the organic matter is rapidly degraded under the action of biological oxidation, reducing the amount of chemicals needed and lowering the operating costs of organic wastewater treatment.

The invention relates to the technical field of paper-making industry wastewater biological oxidation treatment, in particular to paper-making industry wastewater biological oxidation treatment equipment which comprises a treatment pond and an aeration bottom plate, the aeration bottom plate is mounted on the inner bottom wall of the treatment pond, multiple treatment assemblies are arranged on the inner side of the treatment pond, and the upper ends of the treatment assemblies are fixed to the upper end of the treatment pond; the treatment assembly comprises a plurality of connecting ropes and a concave frame, the upper end of the concave frame is connected with the upper end of the treatment pond, every two adjacent connecting ropes are connected through a floating head mechanism, and the floating head mechanisms can float on the surface of sewage. Sewage in the treatment pond shakes under the shaking mechanism, the floating head mechanism shakes along with fluctuation of the water surface, the position of the biological filling base plate on the lower side is changed during shaking, a lifting rope pulls a movable shaft rod to move in a center shaft, and the biological filling base plate is pulled to deform through a penetrating rope, so that gaps are generated among biological matrixes filled on the surface; sewage can be in full contact with the biological matrix on the inner side.

The invention discloses a sewage purification system which comprises a water storage tank, a group of partition plates are connected in the water storage tank, the interior of the water storage tank is divided into a first water collection area, two backflow areas, a purification area and a second water collection area through the partition plates, an adsorption box is arranged in the purification area and divides the purification area into two oxidation areas, a first water pump is arranged in the first water collection area, and a second water pump is arranged in the second water collection area. The first water pump is connected with a water distribution pipe through a pipeline; the water distribution pipe is arranged on the upper side of the adsorption box. The sewage treatment device has the advantages that anion pollutants and cation pollutants in sewage are adsorbed and gathered by the first adsorption area and the second adsorption area, nutrient substances gathered on the surface of the adsorption layer are absorbed by plants, the sewage is subjected to nitrogen and phosphorus removal through the biological anaerobic reaction layer, then aeration is performed through an aeration pipe in the oxidation area, and the sewage treatment effect is improved. Under the action of illumination, sewage is subjected to photocatalytic oxidation reaction on the photocatalytic oxidation layer, organic matters are degraded, and biological oxidation, COD degradation and nitrogen-containing compound oxidation are carried out on the biological contact oxidation layer.

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.

The application discloses a method for pretreating resourceful electroplating sludge by synergic biological oxidation, and belongs to the field of mineral processing engineering. The method for pretreating resourceful electroplating sludge by synergic biological oxidation is provided, the method is combined with the synergic biological oxidation pretreatment technology, valuable metal elements in the electroplating sludge are effectively recovered, and the process comprises five steps of slurry treatment, synergic treatment, filtration, ion exchange process and desorption. The method has the advantages of remarkable resourceful effect, friendly operation environment, high production efficiency and the like, and realizes the goal of "waste treatment by waste".

The application provides a method for calculating oxidation rates of S, As and Fe in a biological oxidation process, and belongs to the technical field of process mineralogy. The method introduces MLA to detect the change of the relative content of minerals before and after the biological oxidation of gold concentrate, and calculates the oxidation rate of the biological oxidation process, thereby avoiding the technical problem that the traditional acid-base chemical leaching method for detecting the iron, sulfur and arsenic phases will produce toxic and harmful gases. The application eliminates the influence of the outer oxidation film of sulfide in the oxidation residue through pretreatment of the oxidation residue, reduces the measurement error of the relative content of the sulfide phase, introduces a correction coefficient for calculation, reduces the calculation error caused by irregular mineral particle morphology and too small particle size, and thus obtains a more actual true quality, so that the measured content of the mineral is more accurate. Compared with the traditional method, the method is simple in operation, simple in process, accurate in data and strong in timeliness.

The application discloses a kind of refractory gold concentrate biological oxidation carbon-in-pulp gold extraction process pollutant processing method, by biological oxidation residue filter pressing washing, reduce the impurity ions such as iron, arsenic, polysulfide into carbon-in-pulp cyanidation process from source, source reduces the generation amount of pollutants such as ferricyanide, arsenic, thiocyanate;Biological oxidation residue is treated with hydrogen peroxide before carbon-in-pulp cyanidation, oxidize low-valence sulfur to sulfate ion, can reduce the generation amount of thiocyanate from source, reduce the amount of gold leaching agent.Carbon-in-pulp cyanidation is carried out with low-cyanide reagent, reduce the cyanide content in carbon-in-pulp tailings;Carbon-in-pulp tailings are filter pressed and washed, filter pressing liquid is returned to be used for oxidation residue slurry, re-enter cyanide leaching, make full use of the residual gold leaching agent in filter pressing liquid, and valuable elements such as gold and silver in filter liquid are recycled.The application uses biological oxidation liquid to treat carbon-in-pulp tailings washing liquid, reduces the cost of cyanide breaking treatment of carbon-in-pulp tailings washing liquid.

The application belongs to the technical field of environment, and discloses a two-stage biological oxidation gas guide well, which comprises a well wall structure, a well pipe structure, a filling structure, a biological cover layer structure and a leachate irrigation structure; the well wall structure comprises a reinforced stone cage net, the reinforced stone cage net is arranged in a well hole of a garbage pile body, a first geotextile screen is fixedly installed on the outer side of the reinforced stone cage net, and a concrete base is arranged at the bottom of the outer wall of the reinforced stone cage net. The two-stage biological oxidation gas guide well is formed by the biological filling layer and the biological cover layer structure, the first-stage biological filling layer maintains moisture by using the percolate in the interior of the pile body, the second-stage biological cover layer maintains moisture by the specially arranged leachate irrigation structure, the purpose of in-situ control of landfill gas is achieved, the problem that landfill gas cannot be treated in a small landfill is solved, the two-stage biological oxidation reduces the emission amount of landfill gas, and the method is suitable for the landfill in operation and has the advantages of low cost and easy operation.

The application discloses a method for improving water flooding heavy oil recovery rate by biological oxidation, which comprises the following steps: (1) selection of test block; (2) selection of oxidizing microorganism; (3) selection of activator system; (4) optimization of injection process parameters, the injection process parameters being soak period and water flooding speed; and (5) field construction and acceptance. The application has the following beneficial effects: 1. The oxygen content in water is reduced for the first time by biological oxidation, the purpose of reducing the viscosity of heavy oil is achieved, and the water flooding heavy oil reservoir recovery rate is finally improved by 3-5%; 2. The injection process and soak time are mainly adjusted according to the microorganism system and the field situation at any time, and the effect efficiency of the system on the reservoir is improved; and 3. The application has the advantages of green environmental protection, good oil increasing effect and high input-output ratio, the water flooding efficiency is improved by 30%, the average daily oil increasing amount of a single well is greater than 2t, and the input-output ratio is greater than 1:3.

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.

The utility model discloses an efficient circulating biological oxidation pond which comprises a pond body, a supporting column is fixedly connected to the side surface of the pond body, a first sliding groove is formed in the supporting column, a first sliding block is connected to the inner surface of the first sliding groove in a sliding mode, and a threaded rod is connected to the interior of the first sliding block in a threaded mode; a motor is fixedly connected to the upper end of the supporting column, a filter screen frame is slidably connected to the inner surface of the tank body, a filter screen is arranged in the filter screen frame, a first connecting block is fixedly connected to the upper surface of the filter screen frame, and a supporting rod is rotatably connected to the interior of the first connecting block; through cooperation of the motor, the threaded rod, the first sliding block and the connecting frame, the filter screen in the oxidation pond can be lifted, through cooperation of the spring, the pull rod, the sliding block and the connecting rod, the angle of the filter screen can be driven to be inclined, impurities fall into the collecting tank from the filter screen through the gravity of the impurities, workers can conveniently collect the impurities in a unified mode, and the operation efficiency is improved.