45results about How to "Achieve denitrification" patented technology

The invention discloses a glass fiber coated filter material with a catalytic function and a preparation method thereof. The glass fiber coated filter material consists of a glass fiber filter material base material, a glass fiber protective film, a catalyst nano-particle layer and an expanded microporous polytetrafluoroethylene filter film. During application in filtering, dust is firstly blockedby the expanded microporous polytetrafluoroethylene filter film of the glass fiber coated filter material with the catalytic function, so that the active sites on catalyst nano-particles are prevented from being covered with the dust and thus losing activity, the catalytic function of the catalyst is efficient and can last for a long time, and residual harmful gas is decomposed by the catalyst nano-particle layer to achieve the purpose of comprehensive prevention and control of the dust and harmful gas. The integration of dust removal, desulfurization, denitration, dioxin removal, mercury removal and the like is achieved, and the filter material is particularly suitable for industrial production.

The invention discloses a composite ecological treatment method for intercepting farmland recession pollutants, relates to a farmland ecological treatment system, and provides an ecological ditch-plant pond-constructed wetland composite system for ecologically intercepting farmland recession pollutants and a construction method thereof. The method can relieve the continuous pressure of farmland recession on the natural water environment, overcome the technical defects of existing farmland recession treatment, effectively solve the problems that an artificial wetland purification system is single in function, the effluent quality cannot meet the specified requirements and the like, strengthen the removal effect on organic matter, nitrogen and phosphorus in water, reduce the occupied area ofthe wetland, reducing the wetland load, prevent wetland blockage, achieve the purposes of high efficiency and low consumption, and beautify the environmental landscape. The system is low in investment and operation cost, convenient to operate, free of electromechanical equipment and operation energy consumption and suitable for being applied to ecological interception treatment engineering of farmland returned water pollutants greatly affected by natural rainfall.

The invention discloses a sewage deep treatment method by using an oxygenation filter system. The method is implemented by establishing an oxygenation filter system, wherein the oxygenation filter system comprises a sewage deep treatment tank in which a filter layer is arranged. Domestic sewage is sufficiently oxygenated through an oxygenation device, and sent into the sewage deep treatment tank through a water inlet pump; the sewage flowing out of a water distributor passes through the filter layer from bottom to top; a porous sintered ceramic granule filter material with developed pore structure can provide an attachment space for microbial films; the growth of the microbial films can enhance the removal effect on COD (chemical oxygen demand) and ammonia nitrogen in the sewage; as the water flow ascends, the dissolved oxygen content in the sewage gradually decreases, and an anoxic layer is formed on the upper part of the filter layer, thereby implementing the denitrification action and lowering the total nitrogen content in water; and since the filter layer has favorable adsorption and entrapment actions, the (suspended sediment) SS content in the sewage is lowered. The oxygenation filter system is small in occupied area and simple to operate, does not need to clean the filter layer after shutdown, and provides favorable conditions for removing COD, ammonia nitrogen and TN (total nitrogen).

The invention provides an ecological filter dam based on efficient in-situ interception of pollutants and application of the ecological filter dam, and belongs to the technical field of water environment treatment. The ecological filter dam sequentially comprises a dam front intercepting area, a front dam, a biological contact oxidation area and a rear dam in the water flow direction. The dam front intercepting area comprises an overwater trash holding buoy and a fishing net; the front dam is formed by stacking a plurality of ecological gabion single bodies, which are respectively filled withmedium and small-particle-size matrixes and large-particle-size matrixes in a staggered manner; an aeration system in the biological contact oxidation zone comprises an aeration pipe arranged at the bottom of the river channel and a microporous aeration disc attached to the aeration pipe; a filler supporting body is arranged above the aeration system, and biological filler is hung on the filler supporting body; the rear dam is formed by stacking a plurality of ecological gabion single bodies filled with matrixes with superfine particle sizes in a staggered mode. The ecological filter dam can effectively improve the removal capacity of the filter dam, the problem of dam body blockage is fundamentally solved, and the service life of the ecological filter dam is greatly prolonged. And meanwhile, the dam body adopts modular units, is easy to construct, can be replaced and disassembled in time, and is wide in applicability.

The invention discloses a flue gas denitrification system. The flue gas denitrification system comprises a boiler hearth, a pyrolysis mechanism, an SCR reactor, a pipeline system and an exhausting pressurizing mechanism, wherein the pyrolysis mechanism, the SCR reactor and the pipeline system are located outside the boiler hearth; one end of a flue gas pipeline is communicated to the boiler hearth, and the other end of the flue gas pipeline is communicated to a pyrolysis mechanism; one end of a hearth flue is communicated to the boiler hearth, and the other end of the hearth flue is communicated to the SCR reactor; an air outlet pipeline is communicated to a hearth flue through the flue gas pipeline; and the exhausting pressurizing mechanism is connected between the pyrolysis mechanism andthe SCR reactor and is communicated to the air outlet pipeline. The exhausting pressurizing mechanism is arranged at the lower end of the pyrolysis mechanism, and pressurized high-temperature flue gas is introduced into the SCR reactor, so that the flue gas denitrification is realized; and compared with the prior art, the flue gas denitrification system has the advantages that the defect of an over-high temperature of the exhausting pressurizing mechanism is improved, and the service life of the system is not influenced.

The invention discloses a biomass boiler fuel pretreatment method, a pretreatment device and a flue gas denitrification method. The pretreatment method comprises the steps of crushing biomass; spraying a catalyst to the crushed biomass, and mixing well; extracting flue gas with 300-350 DEG C from a boiler, introducing to a biomass material which a catalyst is mixed in, and pyrolyzing the biomass material to obtain pyrolytic gas and carbon, wherein the catalyst is a molecular sieve loaded with copper oxide and iron oxide in a molar ratio of 1:(2-3). The flue gas with 400-500 DEG C extracted from the boiler is mixed with air to treat biomass; low-level heat is utilized; therefore, heating efficiency of the boiler is guaranteed. When the treatment temperature for biomass is low, a pretreatment chamber to pretreat the biomass has low requirements, and the pretreatment process has better safety and reliability.