102 results about "Nitrogen Handling" patented technology

The invention relates to a method for treating municipal intermediate water, in particular to an advanced treatment method for treating the municipal intermediate water which is used as cooling water for a power plant. The method comprises the following specific steps that: water in a municipal sewage treatment plant is introduced into a pool, respectively added with lime hydrate, polymeric ferric sulfate as a coagulant and polyacrylamide as a coagulant aid and clarified; a clarifying solution is added with an disinfectant for disinfection, added with sulphuric acid for adjusting the PH value of the clarifying solution to between 8 and 8.5 and filtered; and intermediate water after filtration is added with a composite scale corrosion inhibitor, evenly mixed and added to circulating water in the power plant. The advanced treatment method solves the relevant technological difficult problems of advanced treatment, disinfection, scale inhibition, anticorrosion, ammonia nitrogen treatment, etc. of the intermediate water recycled by the power plant and provides technological support for the safe and economic use of the intermediate water in the power plant; and the intermediate water in the power plant is used as circulating water and replenishing water for recycling and has remarkable economic, social and environmental benefits.

The invention discloses an interactive type three-chamber biological fuel cell device and a method for denitriding wastewater by using the device, belongs to the sewage biological remediation and in particular relates to a denitrification treatment method applicable to wastewater containing nitrate nitrogen. By adopting the method, nitrate instead of oxygen is taken as an electron acceptor of a negative electrode on the basis of a conventional two-chamber biological fuel cell, and a three-chamber biological fuel cell consisting of a middle positive electrode chamber and two side negative electrode chambers is built; meanwhile, the conditions of switching on and off a middle positive electrode and two side negative electrodes are controlled interactively through a control switch, so that an electrode denitrification process and a non-electrode denitrification process of the negative electrode are reasonably matched to process. The method is capable of sustainably generating current and effectively removing nitrate nitrogen and saving an organic carbon source needed for denitrification; the method is a novel sewage treatment method based on energy conservation and consumption reduction and is good in application prospect.

The invention discloses a method for manufacturing high-tenacity automobile hardware. The method is characterized by including the following steps of S01, casting a mould, S02, manufacturing a blank, S03, conducting machining and forming, S04, conducting galvanizing, S05, conducting chromate passivating, S06, conducting nickel plating, S07, conducting nitriding, wherein the hardware generated after nickel plating is conducted is placed into a part heat treatment furnace to be subjected to nitriding processing, the nitriding temperature ranges from 700 DEG C to 800 DEG C, the nitriding time ranges from 20 hours to 40 hours, ammonia gas serves as a nitriding agent, diffusion is conducted for 3 hours to 4 hours after nitriding is completed, and a product is sent to quenching liquid after diffusion is completed, S08, conducting cleaning and polishing, wherein parts generated after quenching treatment is conducted are cleaned and dried, and deburring is conducted after polishing is conducted and S09 conducting inspecting. According to the method for manufacturing the high-tenacity automobile hardware, the hardware is good in machinable property, good in tenacity and suitable for being widely applied and popularized.

The invention discloses an efficient denitrification treatment method for kitchen wastewater. The method comprises the following steps: 1, pretreating the kitchen wastewater; 2, inputting the kitchenwastewater into a first-stage anoxic tank, and mixing the kitchen wastewater with sludge returned by a membrane tank and a mixed solution returned by a first-stage aerobic tank for denitrification reaction; 3, enabling the kitchen wastewater to enter the first-stage aerobic tank, conducting aeration to remove most of organic matter, and achieving a nitration reaction 4, enabling the kitchen wastewater to enter the next-stage anoxic tank, and continuously performing denitrification reaction on the residual nitrate nitrogen; 5, repeatedly executing the step 2 to the step 4, so as to enable the kitchen wastewater to be treated by the multiple stages of anoxic tank treatment and corresponding aerobic tank treatment; 6, enabling the kitchen wastewater to enter the membrane tank, and further degrading residual organic matter; and 7, putting the kitchen wastewater treated by the membrane tank into a clean water pool. The application of the invention can fully ensure the stable operation, highefficiency and reliability of the kitchen wastewater denitrification treatment process.

The present relates to a process of manufacturing cemented carbide and to a product obtained thereof wherein hex doped WC is subjected to nitrogen before and / or during sintering.

The invention discloses a longitudinal-profiled (LP) high-strength ship plate and a production method. A steel plate comprises the following chemical components in percentage by mass: 0.140 percent to0.180 percent of C, 0.20 percent to 0.40 percent of Si, 1.00 percent to 1.40 percent of Mn, 0.030 percent to 0.070 percent of V, 0.003 percent to 0.018 percent of Ti, 0.0100 percent to 0.0150 percentof N, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S and 0.015 percent to 0.030 percent of Als. The method comprises the following steps: performing nitrogen blowing treatment on molten steel in a converter or a RH refining furnace; heating casting billets to 1100 DEG C to 1250 DEG C and keeping the temperature for 0.5 hour to 5.0 hours; setting a initial rolling temperature to be between 1050 DEG C and 1130 DEG C, and rolling the casting billets to ensure that the thickness of the casting billets is 2.0 times to 3.0 times of the maximum thickness of a final LP steel plate; performing rolling when the temperature of intermediate billets is at 880 DEG C to 920 DEG C, and performing rolling to ensure that the thickness of the intermediate billets is 1.5 times to 2.0 times of the maximum thickness of the final LP steel plate; controlling the final rolling temperature of the steel plate to reach 800 DEG C to 850 DEG C by adopting a profiling rolling way; and performing air-cooling on the steel plate until room temperature is reached so as to obtain the final LP steel plate. According to the longitudinal-profiled (LP) high-strength ship plate and theproduction method disclosed by the invention, the steel plate is high in uniformity of mechanical property in the length direction, and the intensity difference between a thick position and a thin position is in the range of 15MPa, and thus, the toughness and the plasticity are consistent, and therefore, the steel plate is applied to any shapes of LP high-strength ship plates.

The invention discloses a longitudinal variable-thickness ultrahigh-strength ship plate and a production method. The steel plate comprises the following chemical components: 0.060% to 0.120% of C, 0.15% to 0.50% of Si, 1.10% to 1.70% of Mn, 0.040% to 0.070% of V, 0.20% to 0.50% of Cu, 0.10% to 0.50% of Ni, 0.005% to 0.020% of Ti, 0.0120% to 0.0180% of N, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S and 0.015% to 0.030% of Als. The method comprises the following steps of performing nitrogen blowing treatment on molten steel in a converter or RH, heating a casting blank to 1130 to 1250 DEG C and keeping for 40 to 240 minutes; enabling the initial rolling temperature to be 1040 to 1120 DEG C, and rolling the thickness of the casting blank to 2.0 to 3.0 times of the maximum thickness of the final LP steel plate; rolling an intermediate billet at 850 to 910 DEG C, and rolling the thickness to be 1.5 to 2.0 times of the maximum thickness of the final LP steel plate; adopting variable-thickness rolling, and controlling the finish rolling temperature of the steel plate to be 800 to 850 DEG C; and performing air-cooling on the steel plate to the room temperature in order to obtain the final longitudinal variable-thickness steel plate. The steel plate is good in mechanical property uniformity in the length direction, the strength difference between the thickposition and the thin position is within 15 MPa, the toughness and plasticity are consistent, and the steel plate is suitable for the longitudinal variable-thickness high-strength ship plates in anyshape.