50 results about "Municipal solid waste landfill" patented technology

The invention discloses a sub-step flotation and detoxification method for incineration fly ash of medical garbage. The sub-step flotation and detoxification method is characterized in that coseparation of dioxin and a carbon component is realized by first-step flotation, so that the toxicity of organic pollutants including the dioxin and the like in the fly ash is reduced; meanwhile, soluble heavy metal is eluted; second-step flotation of tail slurry is subjected to a sulfide precipitation flotation method and heavy metal including Pb, Zn and the like is removed and recycled, so that the harms of the heavy metal are eliminated. Separated final products mainly comprise enriched carbon, residual ash, heavy metal sediment salt and the like, wherein the enriched carbon rich in the dioxin is conveyed into a garbage incinerator secondary incineration chamber to be incinerated, so that the high-temperature decomposition of the dioxin is realized by a low cost; the volume and the toxicity of the residual ash are greatly reduced and the residual ash is directly conveyed into a municipal solid waste landfill to be safely treated or reutilized, so that the subsequent treatment cost is greatly reduced; the heavy metal in the fly ash is leached with an acid and vulcanized and then is precipitated, floated and recycled, so that a plurality of purposes are realized. The method can realize harmless treatment and resource utilization of the incineration fly ash of the medical garbage under environment-friendly and low-cost conditions.

The invention discloses a heat accumulation type super-low calorific value fuel gas treatment and energy utilization device, which is applied to reciprocal flow heat accumulation type combustion technology of the super-low calorific value fuel gas in industrial production. The device consists of a device body, a periodic reverse gas flow circulating pipeline and a measurement and control system. The self-maintenance combustion of super-low calorific value fuel gases with extremely low methane concentration, such as coal mine methane, gases produced in municipal solid waste landfill, combustible gases produced during pyrolysis and smolder (such as battery heating) of biomass in nature and in the lives of human society and the like, can be realized in the device; and because the aperture of low-porosity porous medium filled in a porous medium packed bed of a combustion chamber is less than the quenching diameter, the combustion can be controlled within the combustion chamber. In addition, a part of heat produced by the combustion of the super-low calorific value fuel gas is pumped out by a smoke suction device and conveyed to the conventional exhaust heat boilers for heating water for heating or producing super-heated steam for power generation; and thus the device has the advantages of energy conservation and environmental friendliness.

The invention provides a percolate biology physical and chemical treatment device of a municipal solid waste landfill, which comprises an improved anaerobic adjusting tank, a recirculation area, an aged refuse reactor, a high-grade oxidation pond, a high-grade adsorption and sedimentation tank, an artificial wet land and an ecological landscape treating pond, wherein the improved anaerobic adjusting tank pretreats percolate; the recirculation area is connected with the improved anaerobic adjusting tank and further treats the percolate; the aged refuse reactor is connected with the recirculation area and adsorbs and degrades the percolate; the high-grade oxidation pond is connected with the aged refuse reactor, and the percolate is reacted chemically in the high-grade oxidation pond; the high-grade adsorption and sedimentation tank is connected with the high-grade oxidation pond, and activated carbon is arranged in the high-grade adsorption and sedimentation tank to adsorb sediment in the percolate; the artificial wet land is connected with the high-grade adsorption and sedimentation tank and further treats the percolate in a biological method; and the ecological landscape treating pond is connected with the artificial wet land and further treats the percolate.

The invention discloses a method for synchronously achieving incineration fly ash detoxification and chromium slag reduction curing. The method includes the following steps that (1), incineration flyash and tuff are weighed, mixed to be uniform and ground, and gelatinized powder is obtained; (2), sodium hydroxide and sodium silicate are weighed, mixed to be uniform and ground, and an alkali activator is obtained; (3), sodium persulfate and sodium oxalate are weighed, mixed to be uniform and ground, and a reductive detoxification inducer is obtained; (4), chromium slag, the gelatinized powder,the alkali activator and the reductive detoxification inducer are weighed, mixed to be uniform and ground, and fly ash and chromium slag powder is obtained; (5), the fly ash and chromium slag powderis weighed and dissolved in water, the materials are mixed to be uniform, and fly ash and chromium slag slurry is obtained; (6), the fly ash and chromium slag slurry is sealed, activated through microwaves, cooled and put in a die to be cured. The leaching concentrations of multiple heavy metals and dioxin in the fly ash and a chromium heavy metal in the chromium slag are all lower than the entrance limiting value of a municipal solid waste landfill. Treated cured bodies have high acid resistance and high constraint capacity for heavy metal inorganic pollutants and organic pollutants.

The invention relates to a method for pre-treating landfill leachate by coagulation-ozonation and belongs to the field of methods for wastewater treatment. The method for pre-treating landfill leachate by coagulation-ozonation comprises the following steps: after coarsely stirring the landfill leachate, adjusting the pH value to 7-8; adding a flocculant into a coagulative precipitation tank to treat in the stirring state; after settling, carrying out ozonation treatment on supernate in an ozonation pond, wherein effluent is pre-treated wastewater; and introducing the wastewater in a subsequent anaerobic-aerobic biological treatment process. According to the method for pre-treating landfill leachate by coagulation-ozonation provided by the invention, under the optimal treatment condition, the removal rate of COD (Chemical Oxygen Demand) of the landfill leachate reaches 70.6%, the BOD5 (Biochemical Oxygen Demand) removal rate reaches 75.4% and the chroma removing rate reaches 94%. The water quality has already been close to secondary standard of pollution control of municipal solid waste landfill of China so as to supply favorable conditions for a subsequent treatment process, thus the pre-treatment process is feasible.

The invention belongs to the field of dangerous waste stabilizing treatment, relates to a method for treating incineration fly ash by mixing diethyl dithiocarbamate carbamate and ferrous sulfate (copperas) in a certain proportion as a stabilization agent, and provides a method for treating multiple kinds of heavy metal in incineration fly ash by mixing diethyl dithiocarbamate carbamate, phosphate and copperas in a certain proportion as an agent to solve the problems that in single use of an existing stabilization agent, many defects exists, for example, a chelating agent is high in use level, cost is high, and multiple kinds of metal are not likely to be fixed by single agents at the same time. According to the method, multiple kinds of heavy metal such as cadmium, lead, zinc and nickel in the incineration fly ash can be fixed at the same time, and therefore the leaching toxicity of the heavy metal is lowered, and the requirement of the Municipal Solid Waste Landfill Contamination Control Standard (GB16889-2008) is met. In addition, the method is low in cost, raw materials are easy to obtain, secondary pollution is avoided, and the treatment method is simple. The simple and feasible method for stabilizing treatment on household refuse incineration fly ash is provided, a great obstacle of restraining the cleanliness development of waste incineration enterprises is eliminated, great environment benefits can be achieved, and obvious economic benefits and good social benefits can be achieved.

The invention provides a method for treating leachate MBR effluent through combination of ozone-catalyzed oxidation and aeration biological filter towers. The method comprises carrying out gas-liquidmixing on leachate MBR effluent and ozone according to a reaction ratio through an injector, mixing the gas-liquid mixture and a circulation fluid, mixing the mixture and hydrogen peroxide according to a reaction ratio through a static mixer, feeding the final mixed liquid into an ozone-catalyzed oxidation tower through a lower water inlet, feeding the tail gas discharged through a top tail gas outlet into an ozone decomposing device, carrying out treatment, carrying out gas-liquid mixing through the injector, feeding the gas-liquid mixture into a biological filter tower through a low water inlet, and carrying out treatment through the biological filter tower so that the product water can stably satisfy the municipal solid waste landfill pollution control standard (GB 16889-2008) in the fig 2. The method realizes full treatment on leachate MBR, solves the problem that the prior art is difficult to treat a thick membrane liquid and realizes the efficient and comprehensive utilization ofozone.

The invention relates to an in-situ biological treating method for a municipal solid waste landfill, which comprises the following steps: 1) reshaping a field area; 2) preventing the field area from leaking; 3) covering the field area; and 4) performing aerobic in-situ biological treatment on the field area. According to the in-situ biological treating method for the municipal solid waste landfill provided by the invention, the waste landfill can be treated within a controllable area; the parameters required by treatment can be precisely calculated; the whole treating process is accurately monitored; the whole process is under a completely closed state; and the secondary pollution to the external environment during the treating process is avoided.

A process for converting municipal solid waste landfills to aerobic conditions that will allow for a highly accelerated and enhanced bioreduction of landfill mass, followed by the optional excavation of the landfill cell materials subsequent to the bioreduction process, separation of excavated materials using trommels, screens, and other means as necessary, production of useable compost materials, and reclamation of recyclable plastics, metal, and glass.

The invention discloses a treatment method for heavy metal polluted sediment. The treatment method comprises the following steps: pumping the polluted sediment into a vibrating screen by a mud pump, carrying out primary sieving on polluted sediment so as to separate gravels and sand grains with the grain diameter being more than 1mm, wherein the dehydrated gravels and sand grains are directly utilized as building materials or filling materials; conveying mud being less than 1mm into a hydraulic cyclone to be further separated; discharging separated mud sand being more than 50 microns into a plate-and-frame filter press to be dehydrated, wherein the dehydrated mud sand is directly utilized as building materials or filling materials; conveying fine slurry being less than 50 microns into a mud preparing tank; conveying prepared mud into a floatation column to be subjected to floating separation; after separation, enriching upwards floating foam on heavy metal, carrying out press filtering and dehydration and conveying the mud into a waste incineration plant or a smelting plant to be treated; and after dehydrating sunk low-pollution clay and fine sand grains, directly conveying the low-pollution clay and the fine sand grains into a municipal solid waste landfill to be landfilled. By adopting the treatment method for the heavy metal polluted sediment, the sediment can be graded and separated, be subjected to volume reduction and quantity reduction treatment and be recycled on site in an efficient and low-cost manner, so that the problems of large treatment amount, high transportation cost and the like in the treatment process of dredging the sediment are effectively solved.

The invention relates to an in-situ environment restoration system of an unstable municipal solid waste landfill. The in-situ environment restoration system comprises a ventilation unit, a pollutant vacuum pumping unit, a percolate pumping unit and a nutrient liquid injection unit; the ventilation unit comprises a ventilation pipeline inserted into a waste heap body and a temperature control device for controlling the air temperature; the nutrient liquid injection unit comprises a supply pipeline inserted into the waste heap body and a nutrient liquid storage device connected with the supply pipeline; and part of pumped percolate can be conveyed into the nutrient liquid storage device to be mixed with nutrient liquid. Temperature-suitable air is injected into the waste heap body to adjust the temperature and humidity of waste in the heap body, the living environment of microbial floras is improved, and the degradation vigor of the of microbial floras is stimulated; and part of the pumped percolate is supplied into the nutrient liquid to provide local bacteria for the nutrient liquid, the local bacteria cooperate with additionally-provided bacteria to degrade the waste, and the degradation ability of microorganisms is improved.

The invention relates to a variable-frequency pulse electrochemical process for removing ammonia-nitrogen in landfill leachate. Variable-frequency pulse electrochemical pretreatment is carried out before anaerobic biological treatment and aerobic biological treatment or variable-frequency pulse electrochemical deep treatment is carried out after the anaerobic biological treatment and the aerobic biological treatment; the variable-frequency pulse electrochemical treatment adopts a variable-frequency pulse electrochemical device which comprises an electrobath and a variable-frequency pulse power supply connected with an electrode plate of the electrobath, wherein the variable-frequency pulse power supply is arranged in a power cabinet, the input end of the variable-frequency pulse power supply is externally connected with a three-phase power of 380V/50Hz, the output ends are used for guiding out anode and cathode which are respectively connected with the positive pole and the negative pole of the electrode plate of the electrobath, and a control panel of the power cabinet is provided with frequency, voltage and current adjusting buttons. Due to the adoption of the variable-frequencypulse electrochemical process, the ammonia-nitrogen removal rate can reach 70-100 percent, and the effluent of the landfill leachate with the unit electricity consumption of 4-8 kwh/m<3>, which is treated by the full process line, has the NH3-N content less than 6 mg/L and reaches the emission standard of national municipal solid waste landfill pollution control standard of GB16889-2008.

The invention discloses a method for large-scale cooperative disposal of aging household garbage in a landfill through a cement kiln, belongs to the field of resource and environment protection and particularly relates to garbage disposal special for municipal solid waste landfills. The method sequentially comprises the following steps of coarse crushing, grain-size sorting, gravity grain-size sorting, gas-solid mixture disposal, heavy material disposal and light material disposal. The method is a garbage disposal method which solves the contradiction between occupation and pollution by the municipal refuse landfills and the demands for the landfills due to day-by-day increases of municipal solid waste, achieves large-scale disposal of the garbage, and does not affect production of a dry method cement plant.

The invention relates to a process system for producing organic soil through classified treatment of municipal solid waste. According to composition characteristics of the municipal solid waste in the system implementation, compostable waste in classified waste is subjected to static aerobic biological fermentation and composting to produce the organic soil, other non-compostable materials can be sold or recycled after re-classification, poisonous and hazardous materials are delivered to a special processing mechanism for processing, waste which cannot be treated or used is sent to a refuse landfill or an incineration plant, and the burying amount of waste can be reduced greatly. According to the system, the accuracy requirement for waste classification is low, the waste source classification operation is simple while follow-up composting treatment is not affected, a composting process is controlled, the quality of produced organic soil products is high, and the purposes of harmlessness, reduction and recycling of the waste are achieved truly. The whole waste classified treatment process is low-consumption, efficient and environment-friendly, full-year production can be realized, and problems about waste classification, treatment and utilization in urban, community and rural areas and the like can be solved effectively.

An upper protective layer structure of an impervious barrier structure of a municipal solid waste landfill is a protective layer structure for projecting an uppermost geotextile layer and geomembrane of the impervious barrier structure at the no-landfill-waste position during design of the upper leachate guide layer of the impervious barrier structure for a pebble bed landfill. The upper protective layer structure of the impervious barrier structure of the municipal solid waste landfill comprises a reservoir side wall slope. An impervious barrier lower structure, an impervious HDPE (high-density polyethylene) film and geotextile are sequentially arranged on the surface of the reservoir side wall slope from top to bottom. A wheat straw mud layer or rice straw mud layer is arranged on the geotextile. Geogrid is arranged in the middle of the wheat straw mud layer or rice straw mud layer in the area with gradient larger than 1:1. The wheat straw mud or rice straw mud firmly and durably protects the upper geotextile and the geomembrane of the impervious barrier structure. The upper protective layer structure has the advantages that structure is simple, construction is safe and convenient, materials are taken locally, quality is reliable, and protection of the geotextile and the geomembrane on the structure surface is evidently effective. Ageing and cracking of the geotextile and the geomembrane on the surface of the impervious barrier structure due to long-term rain and insolation are prevented, and impermeability of the impervious barrier structure is ensured.

The invention relates to a cadmium copper lead polluted bottom mud curing agent. The curing agent is characterized by being composed of alkali materials and heavy metal fixing agents. The alkali materials comprise cement, lime and coal ash; the heavy metal fixing agents comprise monopotassium phosphate or hydroxyapatite and sodium diethyl dithiocarbamate. The invention further relates to a cadmium copper lead polluted bottom mud curing method. The curing method is low in treating cost and can obviously reduce the cadmium copper lead leaching content of bottom mud. Especially, the cadmium copper lead leaching content obtained through an acetic acid buffer method (HJT300-2007) which is a solid waste leaching toxicity leaching method is obviously lower than a limit value of municipal solid waste landfill pollution controlling standard (GB16889-2008).

The invention provides a method for determining an acting range of a biogas gas guiding well of a municipal solid waste landfill, comprising the following steps of: drilling a plurality of gas guiding wells in the municipal solid waste landfill along the same straight line; selecting the two gas guiding wells to be respectively used as a gas pumping well and a detection well; if the pressure of the detection well is positive pressure, determining that the acting range of the gas guiding wells is less than the distance between the two wells; if the pressure of the detection well is negative pressure, determining that the acting range of the gas guiding wells is more than the distance between the two wells; selecting different gas guiding wells to be combined to gradually and accurately determine the acting range interval of the gas guiding wells; and when the pressure of the detection well is zero or weak negative pressure and the oxygen concentration is more than zero, determining that the distance between the detection well and the gas pumping well is the acting range of the gas guiding wells. According to the method for determining the acting range of the biogas gas guiding well of the municipal solid waste landfill, the problems of the existing method that the engineering period is long and the quantity of the drilled wells is more are solved, and the aim of determining the acting well of the gas pumping well by an optimized scheme is achieved; and the method is convenient to operate and is safe and practical.

The invention discloses an extracting agent for treating dioxin in flying ash and a method for extracting the dioxin by the extracting agent, which belong to the technical field of environment engineering. The extracting agent comprises the following ingredients in percentage by volume: 10 to 80 percent of sulfonated kerosene, 10 to 50 percent of normal hexane and 10 to 40 percent of acetone. A method for preparing the extracting agent comprises the following step that the raw materials in the proportion are uniformly mixed. The invention also discloses the method for extracting the dioxin by the extracting agent, which comprises the following steps that: the extracting agent for treating the dioxin in the flying ash and the flying ash are mixed according to the mass ratio of 1:1 to 3:1, the mixed materials are placed in a stirrer at normal temperature for being continuously stirred for 12 to 48h, and then, the still-standing delamination is carried out. The extracting agent has wide sources, low price and high treatment efficiency. The equivalent concentration of the toxicity of the dioxin contained in the flying ash after the extraction treatment can be lower than the limit value specified by the pollution control standard of municipal solid waste landfills, the flying ash can be sanitarily landfilled after further innocent treatment, and the efficient innocent treatment and the resource utilization of the flying ash are realized.

The invention discloses a recycling method of municipal solid waste landfill leachate. The invention provides a recycling technology for separating humic acid from leachate and then concentrating into an organic liquid fertilizer. According to the technology, the treatability of the leachate can be improved or the leachate can be treated to be up to standard, and the problems and defects during treatment of concentrated liquor in the reverse osmosis and nano-filtration technology can be overcome. When a secondary ultrafiltration system treats primary concentrated liquor, less hydrochloric acid is added to reduce the concentration of calcium carbonate in the primary concentrated liquor and maintain the pH value being more than 7 so as to prevent the blocking problem of calcium carbonate. The recycling method has the characteristics that the recycling technology is provided from another view aiming to the most important problem that the indices of organic matters in the treated effluent water difficultly reach the standard because of high-concentration humic acid in the leachate, and the up-to-standard treatment of the leachate can be also considered.