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Deep treatment method for cyanide-containing waste water of tailings pond in gold industry

The invention discloses a deep treatment method for cyanide-containing waste water of a tailings pond in the gold industry. The process adopts an ozone oxidation method, a catalytic oxidation method and a biological treatment method to collectively deeply treat the cyanide-containing waste water of the tailings pond in the gold industry. Through the combination of the three methods, a good treatment effect on the cyanide, thiocyanate, arsenic and heavy metals is good, the content of the cyanide after being treated is less than or equal to 0.05mg/L, the content of ammonia and nitrogen after being treated is less than 1mg/L, and other pollutants after being treated can meet the requirement of the ground surface water grade-B water quality standard. The method is used for treating the cyanide-containing waste water of the tailings pond in the gold industry, the treatment effect on the cyanide, the COD, As and heavy metals is good, the heavy metals such as the gold and silver as well as other metal resource can be recovered, and the secondary pollution caused by the ammonia and nitrogen can be avoided. By adopting the deep treatment method for the cyanide-containing waste water of the tailings pond, a good environment, a good economic benefit and a good social benefit can be achieved.
Owner:CHANGCHUN GOLD RES INST

Method for treating coking waste water by electro-Fenton-coagulation combination process

The invention relates to a method for treating coking waste water by an electro-Fenton-coagulation combination process, which comprises the following steps of: 1) introducing biochemical effluent of the coking waste water into a regulation pond, regulating water quality and water volume, and regulating the pH value to be between 2 and 4; 2) introducing the effluent in the regulation pond into an electrochemical reactor, adding H2O2, and regulating current density to be between 50 and 300 A/m<2>; 3) introducing the effluent in the electrochemical reactor into a coagulation sedimentation pond, regulating the pH value to be between 7 and 8 by using alkaline liquor, adding a flocculating agent, performing a flocculating reaction, and performing mud water separation in the sedimentation pond; and 4) filtering the effluent in the sedimentation pond by a sand leach unit, and discharging. By the method, the biochemical effluent of the coking waste can be deeply treated, chemical oxygen demand(COD), ammonia nitrogen and chromaticity of the effluent can meet the requirements of national first-level discharge standards and the water inflow requirement of the advanced treatment of membrane separation.
Owner:RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

Technique for biological treatment of mine acidic wastewater

The invention relates to a process for biologically treating wastewater with sulfate and hydrochloric acid and recycling elemental sulfur, belonging to the technical fields of environmental protection and wastewater treatment, which is characterized in that in the process, the sludge acidic fermentation products from a wastewater treatment plant is used as carbon source sulfate reducing bacteria for treating acidic sulfate wastewater and recycling the elemental sulfur; the sulfate reducing bacteria SRB in an anaerobic biological reactor reduces sulfate SO4<2-> creature as hydrogen sulfide H2S of colorless sulfur bacteria CSB in an aerobic biofilm reactor reduces H2S or S<2->creature as the elemental sulfur and then the obtained substance is filtered and sand-scrapped by a slow sand filter; the elemental sulfur S in sand filtering material is completely dissolved by an extraction equipment; the extractant CS2, the sand filtering material and the biofilm are separated by a solid-liquid separator; the extracted solution is distilled by a distillation equipment; the distilled solution is parched by a drying device and then the elemental sulfur is recycled.In the invention the mine wastewater with the sulfate and the hydrochloric acid is treated; the elemental sulfur is recycled and the sludge from the wastewater treatment plant achieves resource utilization and harmlessness.
Owner:TAIYUAN UNIV OF TECH

Zero-sewage discharge novel process for development of natural gas fields

The invention discloses a zero-sewage discharge novel process for development of natural gas fields. The zero-sewage discharge novel process comprises the following steps of: classifying sewage in a gas field into normal production sewage, domestic sewage, overhauling sewage, accident waste liquid, rainwater, production wastewater and gas field water, and collecting separately; next, guiding the normal production sewage, domestic sewage, overhauling sewage, accident waste liquid and initial rainwater to a biochemical treatment unit, guiding the production wastewater to an electrodialysis treatment unit and guiding the gas field water to a gas field water pretreatment unit; guiding all of up-to-standard sewage which is treated by the biochemical treatment unit previously and not completely recycled, concentrate generated after the treatment of the electrodialysis treatment unit and the gas field water treated by the gas field water pretreatment unit to an evaporative crystallization unit for advanced treatment; and after the quality of the water is up to the standard, recycling the water as make-up water for circulating cooling water or water for other production in the gas field, and separating out pollutants from the sewage in the form of crystalline salts, backfilling or recycling the crystalline salts, and finally, realizing zero discharge of the sewage.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1

Combined sewage treatment device

The invention discloses a combined type sewage treatment apparatus, which comprises an integrated grid-shaped sewage filter component formed through assembled connection of a plurality of sewage treatment primitive boards. The outer contour of the filter component is adapted to the shape and the size of a cross-section of flowing water of the sewage so as to determine the shapes and the number ofthe selected sewage treatment primitive boards. Each sewage treatment primitive board comprises a cage for filling with a water treatment adsorbent, wherein a unit frame and two cover plates with meshes are actively assembled into the cage. With the meshes in the cover plate, the water treatment adsorbent in the cage can be prevented from loss. The shapes and the number of the sewage treatment primitive boards can be adjusted freely, such that the size of the sewage treatment apparatus can be adapted to a sewage treatment system requiring treatment. The sewage treatment primitive boards are easy to be disassembled and assembled, such that the water treatment adsorbent can be reused so as to reduce the secondary pollution. The apparatus provided by the present invention has characteristicsof simple structure, convenient operation, low cost, strong applicability and good size adjustability, and can be applicable for various sewage treatment systems.
Owner:SHANGHAI UNIV

Machining method of long-and-thin walled cylindrical component

The invention provides a machining method of a long-and-thin walled cylindrical component, and belongs to the technical field of machining of cylindrical components. The method comprises the following steps: carrying out rough machining to obtain a rough machining workpiece with a chuck; carrying out quenching and tempering treatment on the workpiece subjected to rough machining; carrying out ultrasonic flaw detection on the workpiece; carrying out rough turning and half finished turning of the workpiece; carrying out stress elimination treatment on the workpiece; caryring out finished turning of the workpiece; placing a circular disc shaped support part in an inner hole of a chuck end; clamping the chuck; carrying out finished turning of an outer circle and the inner hole; radially cutting a groove on the outer circle of the workpiece close to the chuck part; then carrying out finished turning of the inner hole and the end surface of the other end to a designed size; finally, cutting off the end provided with the chuck; milling and cutting off the end surface of the workpiece of the chuck end to the length of the workpiece to meet the design requirement. According to the machining method of the long-and-thin walled cylindrical component, the deformation of the workpiece during clamping can be avoided, the machining stress of the workpiece can be effectively released, and the situation that coaxial degree of the workpiece meets the design requirement can be guaranteed.
Owner:SHENYANG TURBO MASCH CORP

Multi-layer type water curtain spraying chamber

The present invention discloses a multi-layer type water screen spray room, whose inside is provided with a water screen plate, and the inside of the spray room is divided into the front spray painting operating area and the back painting mist processing area. The bottom of the whole spray room is provided with a water tank, and an air flow channel is formed between the water tank and the water screen plate. The upper part of the painting mist processing area is provided with an air exit, and the upper part of the spray painting operating area is provided with a uniform compression chamber. The uniform compression chamber is connected with the central wind supplying system to make the dissipated paint mist in the whole spray painting operating area can be fully absorbed to the painting mist processing area for processing, moreover, the invention can reduce the energy consumption of the whole system and is convenient for the maintenance of the system. The inside of the painting mist processing area is provided with a glue flower layer, and a plurality of water spray nozzles, and the glue flower layer further absorbs the residual paint mist to ensure the processing effect of paint mist. The water screen plate comprises the upper and lower layer water screen plates, and the upper and lower water screen plates are all provided with water tanks. The invention makes the spray room provide different spray painting environments according to the spray coating requirement of the working piece by choosing to start the water screen plate.
Owner:东莞丰裕电机有限公司

Treatment method and equipment for high phosphorus haematite mineral processing acid wastewater

The invention relates to a method for treating wastewater and equipment thereof. A method for treating acid wastewater generated during high phosphorus hematite ore dressing is characterized in comprising the following steps: 1)a step of preparation of modified red mud is prepared, which comprises the following sub-steps: (1) red mud is dried, crushed and passed through a 20-mesh sieve to obtain red mud powder; (2) according to a red mud powder to hydrochloric acid ratio of between 40 to 60g:1L, the red mud powder is added into the hydrochloric acid, fully stirred in a water bath pot at 60 to 100 DEG C for 1 to 2 hours and cooled to obtain a mixed solution, and (3) the mixed solution is added with ammonia water with stirring, subjected to adjustment pH value to between 7.5 and 8.5 and keeps stand; and the obtained precipitate is washed with distillate water, dried, crushed, passed through a 60-mesh sieve to obtain the modified red mud; and 2) according to a principle of 6 to 23 grams of modified red mud for per litter of acid wastewater generated during the high phosphorus hematite ore dressing, modified red mud is added into a coagulative precipitation tank containing acid wastewater generated during the high phosphorus hematite ore dressing and stirred for 1 to 2 hours to obtain mud-water mixed liquid; and the mud-water mixed liquid flows to a dynamic membrane reactor to obtain reusable acid purified water. The method has the characteristics of good treatment effect, simple process operation, high water flux, low cost, short treatment period, etc.
Owner:WUHAN UNIV OF TECH

Heavy metal-polycyclic aromatic hydrocarbon combined polluted soil reinforcer and application thereof

The invention relates to a plant rehabilitation technology of cadmium-polycyclic aromatic hydrocarbon combined polluted soil, in particular to a heavy metal-polycyclic aromatic hydrocarbon combined polluted soil reinforcer and application thereof. The reinforcer comprises the following components in mol ratio of citric acid: salicylic acid of (0.5-5.0):(0.1-1.0). The reinforcer is put into the heavy metal-polycyclic aromatic hydrocarbon combined polluted soil planted with hyperaccumulator and/or accumulator. The citric acid and the salicylic acid are mixed and then dissolved in water to be used as the reinforcer and then applied to the heavy metal-polycyclic aromatic hydrocarbon combined polluted soil planted with the hyperaccumulator and/or accumulator, especially polluted soil planted with nightshade, and after the nightshade is ripen, the plant and the soil samples are harvested; by comparing the harvested plant and soil samples with the plant and soil samples without the putting of the reinforcer, the treatment effect of the plant and soil samples applied with the reinforcer is best, the Cd extraction rate of the overground part of the nightshade is increased by 39.8 percent; meanwhile, the removal rate of the total quantity of the polycyclic aromatic hydrocarbons in the soil can reach 30.2 percent and the repair efficiency is remarkably improved.
Owner:SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI

Method for treating cyanide-containing wastewater in gold cyaniding enterprises

The invention discloses a method for treating cyanide-containing wastewater in gold cyaniding enterprises. The method comprises the four steps of electrochemical treatment, chemical oxidation treatment, coagulating sedimentation treatment and biological activated carbon treatment. When the cyanide-containing wastewater is treated, cyanide is electrolyzed by adopting the electrochemical treatment method; coagulating sedimentation is carried out by adding a coagulating agent, and heavy metal pollutants in wastewater can be removed; precipitated wastewater is oxidized by adding a chemical reagent; and finally, pollutants which are hardly removed from wastewater by a chemical method are removed by adopting a biological and physical adsorption method through a biological activated carbon treatment system. According to the method, the four steps are combined together according to the characteristics of complex and hardly treated pollutants in cyanide-containing wastewater of gold production enterprises, and are synergized to carry out deep treatment on the cyanide-containing wastewater of gold production enterprises. The method has the advantages of good treatment effect, high treatment efficiency, stable system operation and simple process flow, and can easily realize industrial application, and the treated wastewater can be returned to a production process flow to be used as reclaimed water or discharged with standard level.
Owner:CHANGCHUN GOLD RES INST

Method for utilizing sludge containing vanadium and chromium

The invention discloses a method for utilizing sludge containing vanadium and chromium. The method disclosed by the invention comprises the following steps of: drying the sludge containing vanadium and chromium, then adding an organic binding agent and silicon carbide powder, processing to form balls, and then baking again to obtain mud balls containing vanadium and chromium; and returning the mud balls containing vanadium and chromium to a steelmaking LF (Ladle Furnace) refining process, reducing Cr and V elements of Cr2O3 and V2O5 oxides in the mud balls containing vanadium and chromium by utilizing an LF, and then microallying the mud balls containing vanadium and chromium in molten steel. According to the method, the sludge containing vanadium and chromium is dried and made into balls, so that the treatment cost is low; and the Cr and V elements are reduced and converted into steelmaking alloying beneficial elements in a steelmaking internal refining process and are microalloyed in the molten steel. The method disclosed by the invention is taken as a harmless treatment manner of the sludge containing vanadium and chromium, the sludge treatment cost is reduced, harm of heavy metal elements in discharged sludge to the environment is reduced, the method disclosed by the invention has the characteristics of good treatment effect, energy conservation, environmental friendliness and low cost, and can be used for fully utilizing alloy in the sludge containing vanadium and chromium, so that the effect of producing low alloy steel by microalloying is achieved.
Owner:HEBEI IRON AND STEEL

Integrated electrochemical reaction apparatus for processing difficultly degraded organic waste water and processing method thereof

The invention belongs to the technical field of sewage processing, and concretely relates to an integrated electrochemical reaction apparatus for processing difficultly degraded organic waste water and a processing method thereof. A housing of a reactor is divided into a circle cavity reaction zone and a cone cavity precipitation zone, a semi-arc ruthenium iridium anode and a semi-arc porous iron net are arranged in the circle cavity reaction zone, the insulation pads which are symmetrically distributed are arranged at the intermediate part, and a stainless steel cathode is arranged in the housing of the reactor; a discharge pipeline is arranged at the bottom of the cone cavity precipitation zone, an water inlet pipe is arranged at the top of the housing of the reactor, a drainpipe is arranged at the bottom of the housing of the reactor; and the semi-arc ruthenium iridium anode, the semi-arc porous iron net and the stainless steel cathode are connected with stabilized power supply. Waste water is introduced into the reactor through the water inlet pipe, the reactor is turned on, the stabilized power supply and a motor are turned on, the cathode is rotated with the motor slowly, the waste water is stirred slowly with the cathode, the waste water is subjected to Fenton-like and electric flocculation reactions near the porous iron net, electrooxidation is generated near the ruthenium iridium anode, the waste water is discharged from the drainpipe, and a precipitate is discharged through the discharge pipeline.
Owner:HARBIN INST OF TECH

Water recycling circulating system

The invention discloses a water recycling circulating system, which mainly comprises the treatment process that: sewage flows into a collector well 1 from a water inlet pipeline; larger suspended matters in the sewage are removed in a grid trench 2; the sewage flows into a regulating reservoir 4 and the water amount and quality of the sewage are regulated; the sewage is purified through a composite biofilter system 7 in a biofilter chamber 6; the treated water flows into a middle tank 8 for storage; and the stored water is subjected to subsequent treatment through an artificial wetland 9, namely the treated water is the recycled water for secondary use. Due to the adoption of the composite biofilter system 7, the water recycling circulating system overcomes the defects that the traditional biofilter is easily blocked and the like, greatly improves the treatment efficiency and stability of a reactor, and has the advantages of good treatment effect, low energy consumption, simple and convenient operation, low operating cost, and the like. The water quality of the treated recycled water can reach a national level of discharge standard, an aeration tank, a sedimentation basin, and the like in the traditional recycled water treatment system are saved, and the construction cost is saved.
Owner:安徽鲁班建设投资集团有限公司
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