51results about How to "To achieve the goal of "treating waste with waste"" patented technology

The invention belongs to an adsorption material, and concretely discloses a carbon / hydrotalcite composite adsorption agent. The carbon / hydrotalcite composite adsorption agent comprises a carbon substrate and carbonate and hydroxyl double-intercalating hydrotalcite carried on the surface of the carbon substrate. The invention also discloses a preparation method of the carbon / hydrotalcite compositeadsorption agent. The method comprises the following steps of putting a raw material solution containing a carbon substrate and raw materials of ion sources, carbonate sources and hydroxyl sources forsynthesizing hydrotalcite into a sealed container; performing aging at 90 to 130 DEG C; preparing the carbon / hydrotalcite composite adsorption agent. The preparation process is simple; the operationis easy; the prepared magnetic composite adsorption agent can realize the fast separation under the external magnetic field conditions. The adsorption material belongs to a novel environment functional material, and can be widely applied to the treatment of domestic wastewater and industrial waste water.

The invention relates to a method for processing waste acid generated during preparing acid from fume generated in the smelting process of metal sulphide ore. In the method, the waste acid generated in process of preparing the acid from the metal smelting fume is processed by adopting a ferrous sulfate-lime neutralization method. The method comprises a sulfuration step and a neutralization step and is characterized in that a neutralizer used in the neutralization step is calcium carbide neutralizer slurry prepared from calcium carbide. In the invention, improvement is carried out aiming at the problems that in industrial application, the ferrous sulfate-lime neutralization method is large in the consumption of the calcium material lime of the neutralizer and high in processing cost; through fully utilizing the characteristic that the content of effective CaO in carbide slag is high, the carbide slag is used as a calcium material to replace the lime, thereby greatly reducing the cost, achieving the environment-friendly effect of treating the waste liquid by utilizing the waste slag, creating a novel way for use of calcium carbide and achieving the purpose of using wastes to treat wastes.

The invention discloses a method for repairing soil containing novel organic pollutants by using sludge biological carbon. The method comprises the steps of (1), drying a biomass raw material containing sludge at a temperature of 40-60 DEG C, sieving the biomass raw material containing the sludge via a sieve with 10-200 meshes, and carbonizing the biomass raw material for 0.5-6 hours at a temperature of 300-650 DEG C under an anaerobic condition to prepare biomass carbon; (2), applying the prepared biomass carbon to the surface of the polluted soil according to a mass ratio of 0.5-5%, plowing the surface layer of the polluted soil in a distance of 0-30cm, and enabling the surface layer of polluted soil to be fully and evenly mixed with the biomass carbon; and (3), aging for 6-12 months. The biomass carbon is low in cost of preparation raw material and environmentalally-friendly; the preparation process is simple and feasible and totally conforms to the principle of turning waste into wealth and forming the stereoscopic agriculture. In addition, the biomass carbon contains a large quantity of carbon elements and nutritional ingredients; the biomass carbon has the effect of fertilizing the soil.

The invention relates to the technical field of regenerating treatment and recycling utilization of sludge and particularly discloses a preparation method of a novel sludge carbon-based desulfurization and denitrification catalyst. The preparation method disclosed by the invention has the advantages that a carbon product obtained by utilizing a hydrothermal carbonization method has more active sites and stable C-O compounds, and the adsorbing capability is larger than that of high-temperature cracked carbon, and rare-soil metal is used as a catalyst; the novel sludge carbon-based desulfurization and denitrification catalyst has the characteristics of wide source and low price, and the obtained sludge carbon-based catalyst is high in activity and strong in stability; the processing steps are simple and feasible; the catalyst is environmental-friendly, is easy in promotion and application, has industrial application prospect and achieves the purpose of treating-waste-by-waste really.

The invention discloses a method for treating polluted water by using solid waste steel slag. The present invention modifies steel slag, an industrial solid waste environmental protection material, and adopts steel slag adsorption method to treat eutrophic water and water polluted by heavy metals, which can effectively degrade TP, TN, As, Pb, COD in sewage etc., can effectively improve eutrophic water bodies and water bodies polluted by heavy metals, and can be directly applied to the treatment of urban rivers, lakes, and groundwater, effectively solving the current water pollution problems caused by urban construction and development.

The invention discloses a printing and dyeing wastewater treatment method which comprises the following steps of: firstly mixing the printing and dyeing wastewater with domestic sewage; stirring at a certain pH value; and mixing intrinsic iron irons, magnesium ions, calcium ions and hydroxides of magnesium ions in the wastewater and the components such as suspended particles and the like in the domestic sewage to form a composite flocculating body with a synergistic effect. The composite flocculating body removes chromaticity in the printing and dyeing wastewater through the effects such as electrostatic adsorption, adhesion, bridging, sweeping and the like, and the domestic sewage is purified at the same time. The method disclosed by the invention is applicable to water-soluble and non-water soluble single kind or more kinds of mixed wastewater, and can be matched with a biological method or other physical and chemical methods for further treatment. The method has the characteristics of high decoloration degree, remarkable reduction of COD (chemical oxygen demand), suspended solids and total phosphorus and nitrogen, short treatment flow, simplicity in operation and management, only need for acid-base agents, low equipment investment and operation cost, no need of changing the original treatment facilities, wide application range, convenience in popularization and application and the like.

The invention discloses a preparation method of porous tea residue biochar with a high specific surface area, and belongs to the field of resource reutilization of product processing wastes. Potassiumbicarbonate is used as a modifier. The method comprises the steps: washing tea residues with hot water, drying and crushing; secondly, carrying out hydro-thermal treatment on the tea residues; dryinga tea residue hydrothermal carbon solid after hydrothermal treatment; then soaking and uniformly mixing the hydrothermal carbon and potassium bicarbonate; after drying, putting the mixture into a tubular muffle furnace for pyrolysis; and carrying out acid washing, water washing, drying and ball milling on the carbonized product after pyrolysis to obtain the tea residue biochar, wherein the prepared tea residue biochar has a developed pore structure and a large specific surface area, the specific surface area is 1278-1405 m<2> / g, and the pore volume is 0.6734-0.8067 cm<3> / g. The tea residue biochar has a good removal effect on tetracycline in a water body, and the adsorption capacity of the tea residue biochar on tetracycline in the water body can reach 429-478 mg / g.

The invention relates to a method for modifying straw biochar for remediating heavy metal contaminated soil. The method comprises the following steps: (1) feeding crop straw as a biochar raw materialto a drying oven, and smashing and sieving the crop straw to obtain powdery crop straw; (2) weighing the crop straw, placing the crop straw in a box-type atmosphere furnace, introducing nitrogen to keep an anaerobic condition, performing programmed heating to a target temperature, and keeping the final temperature for pyrolysis for 2-4 h to obtain original biochar; (3) repeatedly washing the biochar with deionized water to be neutral and drying the biochar; (4) weighing the straw biochar, soaking the straw biochar in 30% sodium hydroxide and performing stirring; (5) repeatedly washing the straw biochar with deionized water, and placing the straw biochar in the drying oven to obtain the target product, namely, alkali modified biochar. The crop straw subjected to reduction and harmless treatment can effectively immobilize heavy metal pollutants after being added to the heavy metal contaminated soil, durable and stable remediation effect is realized, secondary pollution is avoided, and the biochar is an ideal low-cost remediation agent for the heavy metal contaminated soil.

The invention discloses a preparation method of rice straw modified charcoal for removing tetracycline in a water body, and belongs to the technical field of resource recycling of product processing wastes. The preparation method comprises the following steps of: washing, drying and crushing rice straws; fully and uniformly mixing the crushed rice straws with ferric chloride and urea in an aqueoussolution; drying a mixture, pyrolyzing the dried mixture in a tubular muffle furnace; washing, drying and ball-milling a pyrolyzed carbonized product to obtain rice straw modified charcoal. The specific surface area of the prepared rice straw modified charcoal is 512-606 m<2> / g; and the pore volume of the prepared rice straw modified charcoal is 0.1328-0.1537 cm<3> / g. When the concentration of the tetracycline in the water body is initially within the range of 0-100 mg / L, the removal rate of the tetracycline in the water body by the rice straw modified charcoal exceeds 95%; and the rice strawmodified charcoal has magnetism and is easy to recover.

The invention discloses an organic waste liquid treatment method which comprises the following steps: firstly adjusting the pH value of an organic waste liquid to 2-3, aerating and stirring, separating out jellies from the organic waste liquid, and fishing out dross; then adding an alkaline to adjust the pH value to 8-9, inputting 1-2g / L potassium permanganate and reacting for 20-40 minutes; then adding a flocculant FeSO4 and a coagulant aid PAM for coagulating sedimentation and filter pressing by virtue of a filter press; and adsorbing and filtering the filtrate by active carbon to be discharged in a standard manner. The method disclosed by the invention is easy to control the treatment process, is extremely implemented in the existing process, and meets the requirement of industrial production.

The invention discloses a moving bed type thermal method distillation crystallizer. The crystallizer comprises a box body, an intake pipe, a water injection pipe, an exhaust pipe and a condenser; the inner part of the box body is provided with a crystallizing chamber, wherein the top of the crystallizing chamber is connected with a feed port arranged on the top part of the box body, the bottom part of the crystallizing chamber is connected with a discharge port arranged on the bottom part of the box body, and a cavity of the crystallizing chamber is full of light filler balls having adsorbing performance; the hypertonic saline injected from the water injection pipe forms a moving bed by using the filler balls as carriers and with the help of the gravity function of the filler balls, and is then subjected to the heat exchanging with the hot air or exhaust fume in the crystallizing chamber in order to separate the saline adhered on the surfaces of the filler balls so as to obtain salt and distilled water. The moving bed type thermal method distillation crystallizer provided by the invention does not scale in the distillation process and is capable of processing all hypertonic saline, so as to achieve zero discharge; with the adoption of waste fume as a heat source, the energy consumption and the running cost are low.

The invention relates to a method for comprehensively utilizing red mud and high-phosphorus iron ore, and specifically relates to a red mud and high-phosphorus iron ore solid dephosphorization and iron extraction technology. The method comprises the following preparation steps of: a, evenly mixing powdered high-phosphorus iron ore, powdered red mud and pulverized coal according to the proportion of 100: (1-100): (1-100), b, heating the mixed material obtained in the step a in a temperature range of 100-900 DEG C and preserving the temperature for 10-300min, c, after the material obtained in the step b is cooled, soaking the material by water for 10-120min and then filtering the liquid, and d, carrying out magnetic separation on the solid filtered in the step c, wherein the magnetic part is hematite or magnet or iron ore concentrate and the phosphorus content is less than 0.3wt%. According to the method, the red mud can be effectively utilized to reduce the pollution to the environment, and at the same time, the phosphorus content of the high-phosphorus iron ore can be decreased for recycling. The method is simple in process, low in production cost and beneficial to industrial popularization.

The invention discloses a green restoration method of organic contaminated soil. The green restoration method is used for the technical fields of organic contaminated soil restoration and waste recycling. The green restoration method is different from a conventional charcoal adsorption soil organic contaminant restoration method in that environmentally-persistent free radicals with oxidative activity on the surface of hydrothermal charcoal and H2O2 carry out heterogeneous catalysis degradation on soil organic contaminants. Under the condition of normal pressure and temperature, the organic contaminated soil, the hydrothermal charcoal and H2O2 are mixed to be uniform according to the mass ratio of the organic contaminated soil to the hydrothermal charcoal of 5:1 to 20:1 and the solid-to-liquid ratio of the organic contaminated soil to H2O2 of 2:1 to 10:1 to synergistically remove the organic contaminants in the soil. The contaminant removal rate in the organic contaminated soil is increased, meanwhile, no contaminant precipitation or secondary pollution is generated in a reaction system, and no soil structure or ingredients are damaged inevitably. The method is simple in process, economical, efficient and environmentally friendly, and has great application potential in the field of organic contaminated soil restoration.

The present invention discloses a method for synergistically treating heavy metal sludge in cement production. The method comprises: (1) carrying out a drying pretreatment on heavy metal sludge so as to make the moisture content be less than or equal to 40 wt%; (2) mixing the obtained heavy metal sludge and a cement raw material to prepare a raw material for cement; and (3) after the raw material for cement is homogenize, firing into a cement clinker. According to the present invention, with the method, the harmless treatment of the sludge and the production of the cement clinker and the product thereof can be simultaneously achieves, such that the heavy metal sludge with characteristics of complex components and difficult recycling is completely digested, and the quality performance of the cement product is not affected.

The invention provides a garbage pyrolysis sewage treatment system. The system comprises a raw material cabin, a raw material pre-treatment device, a pyrolyzing furnace, an oil-water separating device, a water collecting pool, a pyrolytic carbon cooling device, a primary sewage purifying device, a comprehensive sewage treatment system and a pyrolytic carbon collecting device; the raw material cabin is connected with the raw material pre-treatment device; the raw material pre-treatment device is connected with the pyrolyzing furnace by a pipeline; the raw material cabin is connected with the water collecting pool by a pipeline; the pyrolyzing furnace is connected with the oil-water separating device; the sewage outlet of the oil-water separating device is connected with the water collecting pool; the pyrolyzing furnace is connected with the pyrolytic carbon cooling device by virtue of a discharge hole; the pyrolytic carbon outlet is connected with the sewage primary purifying device. By utilizing the method provided by the invention, the investment of sewage equipment is reduced, the process is simplified, and the quenching water is saved at the same time. The adsorption function of the garbage pyrolytic carbon is re-found for treating pyrolysis sewage without secondary pollution, the purpose of treatment of a waste with another waste is achieved, so the method is a environment-friendly and effective method for treating pyrolysis sewage.

The invention discloses a treatment method for converting acidic tailings into soil, and belongs to the technical field of ecological restoration. The method comprises the following steps that biomasswaste and the acidic tailings are separately aired, crushed and sieved; the biomass waste and the acid tailings are carbonized to obtain a carbide; the carbide is uniformly spread on the waste land of the strong acid tailings, a certain amount of compound fertilizer, organic fertilizer and artificial soil are added into the carbide, and the mixture is uniformly mixed; and stress resistance trees,shrubs and herbaceous plants are selected to be planted. According to the method, the biomass waste such as straws are fully utilized, so that soil fertility is increased; meanwhile, carbonization isconducted to promote thermal weathering of the tailings, and the conversion of the tailings into the soil is accelerated, so that the ecological restoration is accelerated; and fine charcoal is wrapped around the acid tailings to isolate sulfur from being in contact with the air, so that generation of an acid liquid is reduced.

The invention relates to a resource process of industrial solid wastes and discloses a process for burning ceramiste by chemical excess sludge. The process comprises the steps of: agitating the sludge that is mechanically dehydrated after drying, blending, dry-mixing and water filling; prilling to obtain raw nodules; and drying the raw nodules and roasting the raw nodules at 1050-1300 DEG C to form sludge ceramsite. The leaching concentration of heavy metal is far lower than GB5085.32007 (leaching toxicity identification of hazardous waste identifying standard). The process not only reduces energy consumption and has low production cost, but also creates a novel way for resource treatment of sludge by means of treating waste with waste and recycling the wastes. The invention has obvious environmental and economic benefits.

The invention relates to a smelting and roasting device and particularly relates to an energy-saving tunnel reduction kiln for both combustion and reduction. The energy-saving tunnel reduction kiln is characterized in that a drying section, a heating section, a combustion section, a reduction section and a cooling section are orderly arranged in the tunnel reduction kiln; the sections have different functions; a ventilation outlet is formed in the top of the inlet of the drying section, a heat source inlet is formed in the top of the inlet of the heating section, and an air inlet is formed in the top of the outlet of the cooling section; the bottom of the cooling section is communicated with the bottom of the middle position of the drying section, and the bottom of the heating section is communicated with the bottom of the drying section in a position near the outlet. The energy-saving tunnel reduction kiln has the advantages of energy saving, no requirement on a drying place for molded materials, low noise and the like.

The invention relates to the technical field of soil treatment, in particular to a resource utilization method of hexavalent chromium contaminated soil. The method comprises the following steps: (1) physically crushing and screening hexavalent chromium contaminated soil, (2) physically crushing and screening blast furnace slag, (3) uniformly stirring and mixing water, the screened hexavalent chromium contaminated soil and blast furnace slag, (4) granulating the mixture to form a ceramsite raw material, (5) drying and roasting the ceramsite raw material, and (6) cooling the roasted ceramsite toobtain a ceramsite product taking hexavalent chromium contaminated soil and blast furnace slag as raw materials. According to the method, the remediation problem of the remediated soil is solved in aresource utilization mode, resources such as raw coal do not need to be purchased additionally, the purpose of treating waste with waste is achieved, and the disposal cost is reduced.

The invention relates to grape residue sludge-based high-efficiency biological carbon and a preparation method and application thereof and relates to the technical field of solid waste treatment and recycling. The grape residue sludge-based high-efficiency biological carbon is prepared from dry sludge and dry grape slag through activation and pyrolysis. The grape residue sludge-based high-efficiency biological carbon has high adsorption and decontamination ability. The preparation method comprises mixing dry sludge and dry grape slag, grinding the mixture, adding a chemical activator into thepowder, carrying out dipping activation for 20-30h, carrying out pyrolysis on the product at 400-700 DEG C in the inert gas atmosphere for 30-120min, adding an acid to immerse the product, washing theproduct through water until pH of 7 and carrying out drying. The preparation method has simple processes and realizes a low cost and recycling of solid wastes. The grape residue sludge-based high-efficiency biological carbon is used for sewage treatment, realizes disposal of wastes from wastes and satisfies the requirements on sustainable development.

The invention discloses an alkali-modified charcoal loaded zero-valent iron composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing original biochar from a biochar raw material by using a pyrolysis carbonization method, carrying out alkaline solution impregnation modification on the original biochar, stirring and fully contacting, washing with ultrapure water until the pH value is neutral, carrying out suction filtration, and drying to prepare alkali modified biochar; and the alkali modified biochar and zero-valent iron are subjected to ball milling, and the alkali modified zero-valent iron loaded composite material is prepared. The composite material prepared by the invention has a higher specific surface area, can effectively load zero-valent iron, and has better adsorption capacity and removal effect on chlorohydrocarbon in water. Adsorbed chlorinated hydrocarbon can be reduced by zero-valent iron, and secondary desorption is avoided. The composite material can be used for effectively adsorbing, reducing and removing chlorohydrocarbon in water, and has the characteristics of easiness in operation, high efficiency, greenness and the like.

The invention relates to the field of preparation of fluorine removal agents, in particular to a method for preparing a fly ash fluorine removal agent through two steps of hydrothermal reaction / acid leaching and an application. According to the method for preparing the fly ash fluorine removal agent through two steps of hydrothermal reaction / acid leaching, fly ash and an alkaline solution are mixed and subjected to a hydrothermal reaction at the temperature of 35-200 DEG C for 0.5-6 h, washing and suction filtration are performed, and a filter cake is formed; the filter cake is soaked in an acid solution or subjected to magnetic stirring treatment for 5-10 min, and then, suction filtration is performed; the filter cake subjected to acid treatment is dried, and the fly ash fluorine removalagent is obtained. The fluorine removal agent is a novel adsorbent with great prospects, can be widely used in the industries of fluorine-containing wastewater treatment and high-fluorine surface water purification, can be put in a proper container for use and can be subjected to one-time batch-type treatment, that is, the fluorine removal agent is added to high-fluorine water and stirred to adsorb fluorine ions, and the purpose of fluorine removal is achieved. In a word, the fluorine removal agent has various application methods and can be selected and used according to actual conditions.

The invention provides a method for utilizing scheelite slag. The method comprises the following steps: uniformly mixing scheelite slag with fuel coal; and delivering the mixed material into a combustion chamber of a coal boiler for combusting. The method can be used for solving the problem that scheelite slag requires innoxious treatment, and can prevent sulfur dioxide and nitrogen oxide generated in combustion of sulfur-containing fuel coal from entering tail gas, so that the stress of desulfurization and denitrification for tail gas of an industrial coal boiler can be relieved. The invention further provides a device for utilizing the scheelite slag and an application of the scheelite slag as a sulphur-fixing agent.

The invention relates to a method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid. The method comprises the following steps: (1) mean value blending and coagulating sedimentation: carrying out pH adjustment, coagulation flocculation and sedimentation on potassium ferricyanide-containing wastewater by utilizing a large amount of H < + >, Cu < 2 + > and Fe < 2 + > contained in ferric trichloride etching waste liquid; (2) solid-liquid separation: carrying out solid-liquid separation on ferrous ferricyanide and copper ferricyanide precipitates formed by ferricyanide ions in the potassium ferricyanide-containing wastewater by adopting a filter press, sending an obtained filter cake to a metal sludge treatment section,collecting an obtained filtrate, and sending the filtrate to an evaporation desalting device; (3) evaporating and desalting: evaporating, concentrating, crystallizing and desalting an obtained filtered clear liquid by using a triple-effect evaporator; and (4) biochemical treatment: mixing condensed distilled water after distillation treatment of the triple-effect evaporator with domestic sewage toenter a UCT-MBR combined process biochemical treatment system. According to the method, non-toxic and harmless treatment of the ferric trichloride etching waste liquid and the potassium ferricyanidewastewater is realized, and environmental pollution is avoided.

The invention discloses a low-cost desulfurization wastewater pretreatment method which comprises the following steps of: introducing desulfurization wastewater into a primary reactor, adding carbideslag into the primary reactor, and conveying the reacted desulfurization wastewater in the primary reactor into a first-stage sedimentation tank; conveying the desulfurization wastewater subjected tofirst-stage sedimentation into an air floatation chamber, and introducing flue gas of a thermal power plant or high-concentration CO2 into the air floatation chamber to obtain Ca <2+>-removed desulfurization wastewater; introducing the desulfurization wastewater without Ca <2+> into a secondary reactor, and adding sodium carbonate into the secondary reactor; and conveying the reacted desulfurization wastewater in the secondary reactor into a secondary sedimentation tank. According to the method, lime is replaced by Ca(OH)2 in carbide slag; different from traditional lime treatment, the carbideslag contains a certain amount (8%-10%) of Mg / Al hydrotalcite; the Mg / Al hydrotalcite is a layered dicationic hydroxide compound; and electrons in the layered dicationic hydroxide compound can be subjected to ion exchange with the outside, so that the carbide slag has good adsorbability and is beneficial to improving the settling property of magnesium hydroxide.

The invention relates to a method for improving biodegradability through heterogeneous Fenton oxidation treatment of cotton pulp black liquor. The method comprises the following steps: mixing cotton pulp black liquor and viscose wastewater according to a volume ratio of (1-1.5):4 to be added into a first stirring reaction tank (1), and regulating the pH value to be 2.5-3.5; enabling effluent to enter a solid-liquid separation device (3), treating by adopting an acid precipitation method for 1-2 hours, producing a precipitate, filtering and separating, recycling the obtained xylogen, enabling the supernatant effluent to enter a second stirring reaction tank (7) to be mixed with a H2O2 solution, conveying the mixture into a fixed bed reactor (5) filled with slag (6) by virtue of a pump (4),and performing heterogeneous Fenton oxidation treatment. According to the method disclosed by the invention, resources are fully recovered, the treatment cost is reduced, the wastewater biodegradability is improved, the aim of 'treatment of wastes with processes of wastes against one another' is achieved, the environmental pollution problem is comprehensively treated and solved, good conditions are created for subsequent biological treatment, and the method has excellent popularization and application prospects and environmental benefits.

The invention discloses a method for preparing a flue gas desulfurization powder adsorbent from liquid-solid wastes, which comprises the following steps of: performing acidolysis on ferromanganese solid wastes by using copper electrolysis wastewater, and separating to obtain a sulfate solution; then removing sulfate ions in the sulfate solution by using lime milk and acid, and separating to obtain a metal salt solution; adding carbide slag into the metal salt solution for precipitation reaction, standing for aging, and separating to obtain a gelatinous product; and finally, drying, calcining, crushing and finely grinding the gel to obtain the desulfurization powder adsorbent. The active components of the desulfurization powder adsorbent prepared by the method are CaO and MnO, and the auxiliaries are Fe3O4 and ZnO; the catalyst contains catalytic active components CuO and NiO, and can catalyze SO2 and O2 in the flue gas to react to generate SO3; the desulfurization powder adsorbent is small in particle size, complete in micropores, large in pore volume and high in desulfurization activity; and the method is suitable for dry dedusting device desulfurization or flue gas spray drying desulfurization, does not need a desulfurization packed tower, and reduces the investment cost of enterprises.

The present invention proposes a garbage pyrolysis sewage treatment system, including a raw material warehouse, a raw material pretreatment device, a pyrolysis furnace, an oil-water separation device, a water collection pool, a pyrolysis carbon cooling device, a sewage primary purification device, and a comprehensive sewage treatment system. Charcoal collection device; the raw material warehouse is connected to the raw material pretreatment device, and the raw material pretreatment device is connected to the pyrolysis furnace through pipelines; the raw material warehouse is connected to the sump through pipelines; the pyrolysis furnace is connected to the oil-water separation device, and the sewage outlet of the oil-water separation device connected to the sump; the pyrolysis furnace is connected to the pyrolytic carbon cooling device through the discharge port; the pyrolytic carbon outlet is connected to the sewage primary purification device. The method proposed by the invention not only reduces the investment in sewage equipment, simplifies the technological process, but also saves coke quenching water. Rediscover the adsorption function of garbage pyrolytic carbon to treat pyrolysis sewage without causing secondary pollution, and achieve the purpose of "treating waste with waste". It is an effective method for treating pyrolysis sewage that is green and environmentally friendly.

The invention discloses a treatment method of A landfill leachate concentrate, specifically comprising the following steps of: (1) adding a heavy metal ion precipitation agent to a landfill leachate concentrate, stirring, standing, and filtering to obtain a concentrate I; (2) sequentially adding sodium sulfate and calcium sulfate into the concentrate I, and stirring to obtain a concentrate II; and(3) adding Portland slag cement or Portland fly-ash cement into the concentrate II, stirring, curing and landfilling. According to the invention, the Portland slag cement or Portland fly-ash cement is used to solidify the landfill leachate concentrate therein, thereby achieving the purposes of harmlessness and stabilization, and effectively solving the treatment problem of the landfill leachate concentrate.

The invention provides a method for treating hexavalent chromium in wastewater by using gold tailing products, comprising: mixing gold tailing products with hexavalent chromium wastewater for treatment to obtain treated wastewater. In the invention, gold tailing products are used as a treating agent for treating hexavalent chromium, it is discovered that this treating agent has high efficiency in treating hexavalent chromium without secondary pollution, and additionally gold tailings provided herein is waste itself; the method provided herein enables recycling of waste, enables 'treating waste with waste' to be achieved simply and effectively, and is both energy-efficient and environment-friendly.