Composite functional material capable of synchronously removing nitrogen and phosphorus and preparation method thereof

A technology of simultaneous denitrification and dephosphorization and composite function, which is applied in the field of composite functional materials for simultaneous denitrification and dephosphorization and its preparation, can solve the problems of insignificant phosphorus adsorption effect, poor dephosphorization effect, limitation of lanthanum load, etc. To achieve the effect of enhancing phosphorus adsorption, excellent size effect, and increasing loading

Inactive Publication Date: 2020-05-19
NANJING UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor phosphorus removal effect of existing in-situ restoration materials for surface water bodies, the present invention provides a method for preparing composite functional materials for synchronous denitrification and phosphorus removal. The knot component and the rare earth component are mixed and pelletized and calcined to obtain the finished filter material
By directly calcining the powdered rare earth component and other components without using a rare earth solution, the loading capacity of the rare earth component is significantly increased, the phosphorus adsorption effect of the finished filter material is enhanced, and the problem of poor phosphorus removal effect is solved
[0007] Further, the present invention also provides a composite functional material for synchronous denitrification and phosphorus removal, which is directly loaded with lanthanum oxide or lanthanum hydroxide particles, which solves the problem of limited lanthanum loading; and the weight ratio of rare earth components It improves the adsorption effect of phosphorus and solves the problem that other biological solidification materials have no obvious adsorption effect on phosphorus, thus achieving the simultaneous adsorption of nitrogen and phosphorus.

Method used

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  • Composite functional material capable of synchronously removing nitrogen and phosphorus and preparation method thereof
  • Composite functional material capable of synchronously removing nitrogen and phosphorus and preparation method thereof
  • Composite functional material capable of synchronously removing nitrogen and phosphorus and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing a composite functional material for synchronous denitrification and phosphorus removal. The mixture is obtained by mixing powdered nitrogen adsorption components, penetration components, bonding components and rare earth components, wherein the rare earth components are mixed The mass proportion of the material is 0.5-5%. The mixed material is granulated in a granulator to obtain a spherical filter material, which is calcined to obtain a finished filter material. It is worth noting that the particle size of the rare earth component used is larger than that of the nitrogen adsorption component, and the particle size of the rare earth component is larger than that of the binding component. The rare earth component plays the role of "skeleton" and "ball core" in the pelletizing process, which can promote the formation of the cue ball and increase the strength of the green ball, and also enable the rare earth component to have a ...

Embodiment 1

[0038] In this embodiment, 50% by weight of mordenite, 40% by weight of attapulgite, 5% by weight of diatomite powder, and 5% by weight of lanthanum oxide are formulated. Zeolite and attapulgite are crushed to 200 mesh (that is, the particle size is 75 μm), diatomaceous earth is crushed to 50 mesh (that is, the particle size is 270 μm), fully mixed, and rolled in the granulator while adding water to make the particle size A spherical filter material of about 5mm is calcined at a temperature of 500°C for 4 hours to produce a composite functional material 1 for synchronous denitrification and dephosphorization. Composite functional material 1 is characterized by BET=28.45m 2 / g, the particle strength is 43.15N / particle, the SEM scanning picture is as follows figure 1 shown.

[0039] Through the above preparation method, there is no need to use rare earth solution, the loading capacity of rare earth components is significantly increased, and the phosphorus adsorption effect of ...

Embodiment 2

[0044] The basic content of the present embodiment is the same as that of Example 1, the difference being: the clinoptilolite of proportioning 58% by weight, the attapulgite of 35% by weight, the diatomite powder of 5% by weight, 2% Lanthanum hydroxide by weight. Zeolite and attapulgite are crushed to 200 mesh (that is, the particle size is 75 μm), diatomaceous earth is crushed to 50 mesh (that is, the particle size is 270 μm), fully mixed, and rolled in the granulator while adding water to make the particle size A spherical filter material of about 5mm is calcined at 600°C for 6 hours to make a composite functional material 2 for synchronous denitrification and phosphorus removal. Composite functional material 2 is characterized by BET=20.86m 2 / g, particle strength 68.21N / particle, SEM electron microscope scanning picture is as follows figure 2 shown.

[0045] Through the above preparation method, there is no need to use rare earth solution, the loading capacity of rare ...

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Abstract

The invention discloses a composite functional material capable of synchronously removing nitrogen and phosphorus and a preparation method thereof, belonging to the field of in-situ remediation of surface water. The preparation method comprises the following steps: mixing a powdery nitrogen adsorption component, a permeation component, a bonding component and a rare earth component to obtain a mixture, wherein the mass ratio of the rare earth component in the mixture is 0.5-5%; and granulating the mixture in a granulator, and conducting calcining to obtain a finished filter material. By addingthe rare earth component, the problem that other biological curing materials are not obvious in phosphorus adsorption effect is solved, so synchronous adsorption of nitrogen and phosphorus is achieved; and the finished filter material can be used for synchronous treatment of inorganic nitrogen and soluble phosphorus in surface water, so the problem of nitrogen and phosphorus pollution is effectively solved.

Description

technical field [0001] The invention belongs to the field of in-situ restoration of surface water, and more specifically relates to a composite functional material for synchronous nitrogen and phosphorus removal and a preparation method thereof. Background technique [0002] According to the "2018 China Environmental Status Bulletin", among the 1,613 water quality sections in the country, the proportion of IV to inferior V water quality sections is 25.7%, and the main pollution indicators are ammonia nitrogen, TP, etc.; in 107 lakes (reservoirs) that monitor the nutritional status , mild eutrophication accounted for 23.4%, moderate eutrophication accounted for 5.6%. It can be seen that the rivers and lakes in the country are still seriously polluted by nitrogen and phosphorus. Excessive nitrogen, phosphorus and other pollutants can lead to eutrophication of river and lake systems, algal blooms, and ecological degradation. At the same time, it can also cause black and odorou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/14B01J20/20B01J20/28C02F1/28C02F101/10C02F101/16C02F101/30C02F101/38
CPCB01J20/06B01J20/14B01J20/186B01J20/205B01J20/28019C02F1/281C02F1/283C02F2101/105C02F2101/16C02F2101/30C02F2101/38
Inventor 马天海阮晓红詹炎培尹琳
Owner NANJING UNIV
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