222results about How to "Reduce total nitrogen" patented technology

A hydrocarbon liquid feedstock containing at least 50 wt. % chemically digested organic-MSW material is catalytically hydroconverted utilizing either a single stage or two-stage catalytic reaction process to produce desirable lower-boiling hydrocarbon liquid products. The catalyst can be either a particulate supported type catalyst such as containing cobalt and / or molybdenum and / or nickel on alumina support, or a dispersed slurry type catalyst containing mainly iron oxide with anions of molybdate, phosphate, sulfate or tungstate, and combinations thereof. Broad useful reaction conditions are 600-860° F. (315-460° C.) temperature, 1000-3000 psi hydrogen partial pressure, and fresh feed rate of 20-60 pounds / hr / ft3 reactor volume. Effluent material from the final stage catalytic reactor is phase separated and the resulting liquid portion is fractionated to produce the desired low-boiling hydrocarbon liquid products particularly useful as transportation fuels. If desired, the chemically digested organic-MSW feedstock can be blended with petroleum residua and / or particulate coal and / or mixed waste plastics and the blended feed material processed in catalytic two-stage reactors to produce similar desirable low-boiling hydrocarbon liquid products.

The invention discloses two-stage backflow simultaneous nitrogen and phosphorus removal device and technology for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation of municipal sewage, and belongs to the field of sewage treatment. Municipal sewage enters an anaerobic / anoxic reactor after passing through a regulating reservoir; phosphorus-accumulating bacteria finish storage and phosphorus release of polyhydroxybutyrate (PHB) by using inflow chemical oxygen demand (COD) under an anaerobic condition; phosphorus-rich supernatant enters inside a middle reservoir through a water decanter, and is injected into a moving bed membrane bioreactor by a lift pump after the water quantity is adjusted; autotrophic nitrogen removal of the shortcut nitrification and anaerobic ammonia oxidation is achieved by alternate operation of low-oxygen aeration and anoxic agitation; the processed effluent enters the anaerobic / anoxic reactor again under the action of a suction pump; denitrification phosphorus removal is achieved after phosphorus-accumulating sludge containing the PHB and autotrophic denitrification effluent containing nitrate nitrogen are mixed. Simultaneous nitrogen and phosphorus removal of low-carbon municipal sewage is achieved by using coupling of three functional microorganisms for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation, and the two-stage backflow simultaneous nitrogen and phosphorus removal device has the advantages of being high-efficiency and energy-efficient, stable to run, and low in sludge yield.

The invention relates to a rapid nitrogenous wastewater biological treatment process, particularly to a method for rapidly realizing short distance deep denitrogenation by SBR process. The prior short distance biological denitrogenation technique is not suitable for treating wastewater with low C / N ratio. The inventive method comprises the steps of feeding water, aerating, adding equal amount of raw wastewater, aerating, adding equal amount of raw wastewater, aerating, adding external carbon source, aerating, settling, draining, and idle running. The temperature in the overall process is controlled at 30-33 DEG C, the water dissolved oxygen concentration during nitration stage is controlled in the range of 0.8-1.2 mg / L, the mean sludge retention time in the system is 12-15 days, and the aeration amount and the denitrification time of the short distance deep denitrogenation by SBR process is controlled based on the change feature of online parameter pH value. The inventive method has the advantages of good denitrogenation effect, high degree of automation, low energy consumption, convenient operation, low cost, and suitability for treatment of wastewater with low C / N ratio.

A method and apparatus for producing an oxygen product in which air is separated in an installation including one or more air separation units having higher and lower pressure columns. An exhaust stream produced from a turboexpander and optionally an impure oxygen stream such as that derivable from higher pressure column bottoms is rectified within an auxiliary column to produce an oxygen containing stream that is introduced into the lower pressure column of each of the air separation units to increase the capacity of such columns. The pressure within the auxiliary column is set by the pressure of the exhaust stream such that a nitrogen-rich vapor stream extracted from the top of the auxiliary column can be used in regenerating adsorbent within a pre-purification unit utilized in connection with the installation.

The invention belongs to the technical field of microbial carrier preparation methods and relates to a preparation method of a modified montmorillonite-containing reticulated polyurethane microbial carrier with an interpenetrated network structure. The preparation method comprises adding vinyl polyether polyol, polyether polyol, polyester polyol, H2O, silicone oil, a tin catalyst, an amine catalyst and an olefin monomer into a reactor, carrying out stirring to obtain a uniform mixture, adding modified montmorillonite into the mixture, carrying out stirring to obtain a uniform mixture, carrying out thermal insulation, wherein the mixture is used as a component 1, adding isocyanate and a free radical polymerization initiator into a reactor, carrying out stirring to obtain a uniform mixture as a component 2, mixing the component 1 and the component 2 to obtain a uniform mixture, carrying out foaming to obtain polyurethane flexible foam and carrying out meshing treatment on the polyurethane flexible foam through an alkali liquor immersion or explosion method to obtain the reticulated polyurethane microbial carrier with an interpenetrated network structure. The olefin polymer is introduced into the reticulated polyurethane microbial carrier through the interpenetrated network structure so that hydrolysis resistance and biodegradation resistance of the carrier are improved and compatibility of the polyurethane ingredient and the olefin polymer ingredient is improved.

The invention discloses a flocculant for sewage and a preparation method thereof. The raw materials of the flocculant for sewage include: dimethyl diallyl ammonium chloride, sodium silicate, acrylamide, dibenzoyl peroxide , tert-butanol, ferric chloride, aluminum sulfate octadecahydrate, polyaluminum chloride, ferrous sulfate, polyphosphorus ferric chloride, chitosan, sodium alginate, polyvinylpyridinium salt, porous adsorbent, carbonic acid Sodium Hydrogen, Lignin, Triethylene Triamine, Sodium Methylsulfonate, Propionaldehyde, Alum. The volume and density of the flocculant of the present invention are increased, the flocculation effect is improved, and the suspended matter in the sewage can be effectively and quickly flocculated, and can be gathered into agglomerates, which are not easy to disperse and easy to separate, and at the same time, the corrosion to pipeline equipment is lower than other With similar flocculants, the chemical oxygen demand (COD), biochemical oxygen demand (BOD), and suspended solids (SS) of the treated sewage are all significantly reduced, and the total nitrogen, ammonia nitrogen, and chromaticity are also reduced.

The invention discloses a method for planting hard artificial landscape water-body aquatic plants. The method comprises the following steps of: filling natural plant fibers in mesh bags which are woven by using degradable fibers to form a plant growing carrier; planting different aquatic plant seeds in the plant growing carrier according to the requirements on landscape designs; placing the plant growing carrier with the different aquatic plant seeds in water bodies with hardened underwater or poor underwater matrixes according to the requirements on the landscape designs, and the like. By the method for planting the aquatic plants, the transparency of landscape water bodies is improved, the dissolved oxygen is increased, the eutrophication degree is reduced, the landscape performance is high, and the ecological system becomes perfect gradually.

The invention discloses a biological compound treatment agent for sewage. The biological compound treatment agent comprises a biological flocculant and chlorella. The biological compound treatment agent synchronously utilize the compound biological flocculant and the chlorella to carry out compound treatment, in order to remove the vast majority of pollutants such as ammoniacal nitrogen, SS, nitrite, nitrate nitrogen, TN (Total Nitrogen), TP (Total Phosphorus) and heavy metal. The biological compound treatment agent is efficient in pollutant removal, free from secondary pollution, and enormous in ecological benefits and economic benefits.