A kind of preparation method of low-temperature ammonia removal catalyst
An ammonia catalyst and low-temperature technology, which is applied in the field of preparation of low-temperature ammonia removal catalysts, can solve the problems of low biological nitrogen removal efficiency, and achieve the effects of high nitrogen gasification degree of the product, simple and convenient preparation process, and low energy consumption
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0022] In this example, magnesium chloride and ferric chloride solutions with a concentration of 0.8mol / L were prepared respectively; under the condition of rapid stirring (200rpm), 500mL of magnesium chloride and ferric chloride solutions were mixed; Sodium silicate solution to pH 6.7, forming a colloidal precipitate, washed with pure water for 3 times, dried at 105°C, and crushed to 40 mesh or below 0.45mm in particle size, ready to use, to form component A; crushed to 40 mesh or Sodium silicate powder with a particle size below 0.45mm and starch are uniformly mixed at a mass ratio of 1% to form silicate starch; the straw is dried and crushed, and the fraction particles of 18-35 mesh are screened; the mass ratio is 4:2:4 Mix the above-mentioned granules with silicate starch and water, and stir well to make component B; take 30g of component A and 15g of component B, mix evenly and make 3~5mm particle size particles, and place them in a muffle furnace for anaerobic roasting at...
Embodiment 2
[0024] In this example, keep the temperature at 2-5°C, add 1 g of the above-mentioned catalyst C1 into the reactor, add 600 mL of ammonium sulfate solution with an ammonia nitrogen content of 50 mg / L (the pH of the solution is <5.9), and pass through ozone to make the solution The equilibrium concentration of ozone in the medium was maintained at 12 mg / L, and after shaking for 5 minutes, 10 minutes, and 60 minutes, samples were taken to determine the residual ammonia nitrogen content in the water. At the same time, under the same conditions, the ozone oxidation sample (pH9.0) was used as a control without adding a catalyst (ozone has almost no ability to oxidize and remove ammonia when the pH is lower than 7). The result is as follows:
[0025]
[0026] It can be seen that the effect of using the catalyst of the present invention to remove ammonia by catalytic oxidation is more than 4.7 times that of ozone oxidation alone, and the removal effect is good.
Embodiment 3
[0028] In this example, keep the temperature at 2-5°C, add 1 g of the above-mentioned catalyst C1 to the reactor, add 600 mL of ammonium sulfate solution with an ammonia nitrogen content of 63 mg / L, and inject ozone to keep the equilibrium concentration of ozone in the solution at 15 mg / L, shake the reaction for 5min, 10min, 60min and then take samples to measure the residual ammonia nitrogen and total nitrogen content in the water. At the same time, under the same conditions, the ozone oxidation sample (pH8.7) without catalyst was used as a control. The result is as follows:
[0029]
[0030] It can be seen that the catalytic oxidation group has a high removal rate of ammonia nitrogen, and the removal rate of total nitrogen is also significantly higher than that of the ozone control group.
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More