64 results about "Volume loading" patented technology

A catalyzed diesel particulate filter (CDPF) and a method for filtering particulates from diesel engine exhaust are provided, where the catalyzed diesel particulate filter includes a substrate and a catalyst composition, where the catalyst composition contains at least one first component, at least one second component, and at least one third component, where the first component is at least one first component selected from the group consisting of cerium and a lanthanide and mixtures thereof, the at least one second component is selected from the group consisting of cobalt, copper, manganese and mixtures thereof; and the third component comprises strontium, where the first component, the second component, and the third component are in an oxide form after calcination. The catalyst on the catalyzed diesel particulate filter lowers the temperature at which particulates are removed from the CDPF by oxidizing the particulates on the filter. The catalyzed diesel particulate filter may also include a washcoat. Washcoats prepared from colloidal aluminum oxide may have higher surface areas and pore volumes loadings than washcoats containing aluminum oxide prepared from aluminum nitrate.

A microfibrous matrix with embedded supporting particulates / fibers and chemically reactive materials is provided as a filtration system for the removal of contaminants and other harmful agents from liquid and gaseous streams. Such filter may be used for example to protect the intolerant anodes and cathodes of fuel cells from damaging H2S while simultaneously aiding the selective conversion of CO to CO2 in fuel streams predominated by hydrogen. In general, the reactive materials utilized as well as the supporting matrix of fibers may be broadly selected to remove specific contaminants at specific reaction conditions inherent to the application. Such materials may include chemically reactive materials as high surface area carbons, zeolites, silicas, aluminas, inorganic metal oxides, polymer resins, ZnO, ZnO / Carbon, Pt / γ-Al2O3, PtCo / γ-Al2O3, ZnO / SiO2 and various other catalysts, sorbents or reactants. In an alternative embodiment, entrapped sorbents and other reactants may be used to provide a highly efficient gas and / or liquid separation and purification methodology for gas masks, building filtration systems, and / or as polishing media located downstream of traditional packed bed filtration systems so as to achieve the high volume loading / capacity of the packed bed along with the overall contacting efficiency of the outlet polishing layer.

The invention relates to a bioaugmentation treatment technology of the high ammonia nitrogen wastewater. The treatment technology is characterized in that under the condition that dissolved oxygen exists in the high ammonia nitrogen wastewater, an aerobic pool, an aerobic filter and a membrane pool are established, wherein by utilizing the metabolism of the aerobic microorganism, high concentration of organic substances are degraded, the organic substances with high molecular weight and energy are converted to substances with low molecular weight and energy; the aerobic pool adopts internal circulation and large-scale external circulation hydraulic agitation; and the aerobic filter is filled with novel fixed enzyme-floating filler and immobilized microorganism and microporous aeration and jet aeration are combined for aeration, thus the flow pattern of the nitrification filter is improved. Compared with the prior art, the system of the invention has high sludge concentration and the corresponding volume loading is also high, thus the floor space is small and the capital cost is low; the conversion rate and utilization rate of atmospheric oxygen is high, the effect of mass transfer is good, the anti-shock loading capability of the system is high, the effluent quality is stable; the operating cost is low; the density is increased relatively, the solid-liquid separating effect is good and the yield of excess sludge is low.

A catalyzed diesel particulate filter (CDPF) and a method for filtering particulates from diesel engine exhaust are provided, where the catalyzed diesel particulate filter includes a substrate and a catalyst composition, where the catalyst composition contains at least one first component, at least one second component, and at least one third component, where the first component is at least one first component selected from the group consisting of cerium and a lanthanide and mixtures thereof, the at least one second component is selected from the group consisting of cobalt, copper, manganese and mixtures thereof; and the third component comprises strontium, where the first component, the second component, and the third component are in an oxide form after calcination. The catalyst on the catalyzed diesel particulate filter lowers the temperature at which particulates are removed from the CDPF by oxidizing the particulates on the filter. The catalyzed diesel particulate filter may also include a washcoat. Washcoats prepared from colloidal aluminum oxide may have higher surface areas and pore volumes loadings than washcoats containing aluminum oxide prepared from aluminum nitrate.

The invention which discloses a mangneto modified ceramsite filler, a preparation method thereof and an application of the modified filler in wastewater processing belongs to the wastewater processing field. The modified filler is a magnetic filler which treats ceramsite as a base material and contains mixed magnetic powder, a biological affinity substance and a dispersant. The preparation methodof the modified filler comprises the following steps: 1, respectively immersing ceramsite in an acid liquor and an alkali liquor; 2, adding modification materials, and processing; and 3, mixing, and molding calcining. A method for improving the biological processing of the wastewater with the modified filler is characterized in that: the mangneto modified ceramsite filler is filled in an aerobic reactor according to a packing ratio of 35-50%, the wastewater is introduced, the retention time is 4-6, the volume loading is controlled at 0.5-2kgCOD / (m<3>.d), and the gas-water ratio in the aeration process is 5-15:1. Characteristics of the mangneto modified ceramsite filler are fully utilized in the invention to allow the wastewater processing efficiency to be improved, the wastewater processing cost to be saved, the service life of advanced processing equipment to be prolonged and large scale industrialization application to be easy.

The present invention relates to an anaerobic-micro-aerobic membrane bioreactor and an operation method thereof, and belongs to the technical field of waste anaerobic biological treatment. The bioreactor combines an Upflow Anaerobic Sludge Bed body portion with a two stage membrane module, wherein the body portion comprises a granular sludge anaerobic reaction zone, a three-phase separator, a settling zone and a biogas collection system; and the two stage membrane module are an ultrafiltration membrane module and a nano filtration membrane module, respectively, and an aeration system is arranged at the bottom of the ultrafiltration membrane module. Concentrated water trapped by the ultrafiltration membrane module and the nano filtration membrane module flows back to the bottom of the settling zone, and in the micro-aerobic environment, hardly degradable organic matters are further degraded. The volume loading rate of the reactor in treating hardly degradable organic waste water of pharmacy and coal chemistry can reach about 15 kg COD / (m<3>.d). The anaerobic-micro-aerobic membrane bioreactor and the operation method of the present invention solve the problems that in the prior art when the efficient anaerobic reactors represented by UASB treat hardly degradable waste water, the hydraulic retention time is long, the effect is not ideal, the conventional anaerobic membrane bioreactors have significant membrane contamination, and the hardly degradable organics removal effect is poor.

The invention provides a method for biochemical treatment and standard discharge of sewage of coal chemical industry. The method comprises the steps of BDO (1,4-butanediol) pretreatment and main biochemical treatment, wherein the BDO pretreatment is performed sequentially through a coagulative precipitation tank, an anaerobic tank and a SBR (sequencing batch reactor) tank; the main biochemical treatment is performed sequentially through an aerobic carrier fluidized bed reactor, a pre-denitrification tank, an aerobic activated sludge tank and a secondary sedimentation tank; and a mixed liquor which flows out of the aerobic activated sludge tank partially or entirely flows back into the pre-denitrification tank. The whole process is high in volume loading and impact resistance, and operates safely and stably. The whole biochemical system has high impact resistance; and the treatment effect is slightly affected by the change of the temperature. The whole system has a compact structure and is small in floor area. After high-concentration BDO sewage is pretreated, chemical oxygen demand (COD) of an effluent can be stably maintained to be less than 500mg / L, so that the main biochemical treatment can be easily performed; and after the sewage of the coal chemical industry is subjected to main biochemical treatment, the COD of an effluent can be stably maintained to be less than 50mg / L, so that the national first-class discharge standard is met, and the investment and operation cost is saved.

The invention discloses a preparation method for a high-adaptability nitrifying bacterial agent. The preparation method comprises the steps of: 1) inoculating active sludge on a membrane biological reactor, and continuously feeding a culture solution, composed of sewage, inorganic ammonia nitrogen, a phosphate buffer solution and an alkalinity regulator, into the membrane biological reactor; (2) firstly, setting SRT as non-sludge discharge status, and controlling the ammonia nitrogen volume loading of the membrane biological reactor to be lower than 1.5 kg-N / (m<3>*d), and then stepwise increasing the ammonia nitrogen loading until a maximum value; and 3) finally determining minimum value of the SRT and under the minimum value of the SRT, continuously discharging the nitrifying bacterial agent. The preparation method can produce nitrifying bacteria, which are homologous with the bacteria from a sewage treatment plant, within a short time. The nitrifying bacteria have high degradation activity on ammonia nitrogen, have good adaptability and are low in addition frequency.

In the field of wastewater treatment, microwave irradiation is used to decompose the regeneration method of activated carbon that absorbs organic matter in wastewater. Features: the adsorption of organic matter in wastewater and the regeneration of activated carbon are carried out in the same microwave irradiation regeneration device; the activated carbon is granular, and the humidity Control at 35-55%; the filling volume is 1 / 3-4 / 5 of the reactor volume; the microwave frequency is 2450MHz or 915MHz; the power is 0.5-64kW; The time is 15 minutes; the microwave irradiation regeneration device [20] is mainly composed of a magnetron [12], a microwave resonant cavity [11] and a reactor [10]. 16] and the nozzle [8] in the reactor, the lower part is provided with a sampling port [14] and a water outlet [15], which is connected with the steam outlet [16] with a lye absorption tank [17] and a gas adsorption column [18]. Advantages: (1) realize in-situ or ex-situ regeneration, flexible operation; (2) short regeneration time, low energy consumption; (3) high regeneration efficiency; (4) simple operation, easy to realize automation; (5) no secondary Contamination, no subsequent treatment is required.