Method for removing nitrate nitrogen, corresponding combination preparation, and preparation method and application thereof
A technology of nitrate nitrogen and composite preparations, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of long storage time of nano-iron, poor chemical stability, Easy to agglomerate and other problems, to achieve the effect of convenient operation, increased reaction rate constant, and low purity requirements
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Embodiment 1
[0036] The nitrate concentration in deionized water was set at 10 mg / L, and the pH was 5.5. Different formulations of composite nano-iron materials were added to carry out the nitrate degradation test. The instruments and equipment used in the test process are shown in Table 1.
[0037] Table 1 Instruments and equipment used in the test
[0038]
[0039] Calculated according to the concentration of substances in water, the dosage of nano-iron is 5g / L, and the dosage of aluminum sulfate is 0mg / L, 30mg / L, 50mg / L, 65mg / L, 80mg / L, 100mg / L. Below, the curve of nitric acid concentration changing with time is as follows figure 1 shown.
[0040] From figure 1 It can be clearly seen that as the content of aluminum sulfate in the composite nano-iron material increases, the removal rate and removal rate of nitrate increase significantly. Corresponding to different composite nano-iron materials, the removal rates of nitrate reached 51%, 57%, 61%, 70%, 76% and 83% after 6 hours of re...
Embodiment 2
[0041] Example 2: The equipment used in the test is shown in Table 1. When the initial concentration of nitrate is 5mg / L, pH is 5.5 and under normal temperature conditions, after 6 hours of reaction, the composite nano-iron (the material ratio in the composite nano-iron is: nano-iron 98%, aluminum sulfate 2%) dosage The nitrate removal rates were 22%, 29%, 38%, 54%, 61%, and 83% when they were 0.5g / L, 1g / L, 2.5g / L, 3g / L, 4g / L, and 5g / L, respectively. %, 88%, see figure 2 . On the one hand, the increase in the dosage of composite nano-iron increases the concentration of substrate reactants and increases the driving force of the reaction; Under the joint action of the two, the rate of reduction reaction and the removal rate of nitrate are effectively improved.
Embodiment 3
[0042] Example 3: The equipment used in the test is shown in Table 1. The dosage of composite nano-iron is 5g / L (nano-iron 98%, aluminum sulfate 2%), when the pH is 5.5, the initial concentration of nitrate nitrogen is 1, 3, 5, 10, 20, 30, 50mg / L respectively , the removal rate of nitrate after 6h at normal temperature is 92%, 89%, 85%, 83%, 68%, 53%, 44%, the results are detailed in image 3 . It can be seen that this technical method has a good removal effect for different initial concentrations of nitrate.
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