Novel adsorption catalyst for nitrogen removal of sewage and preparation method thereof

A catalyst and denitrification technology, used in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of difficult separation of Fe conversion products and effluent, and achieve adsorption. good effect

Active Publication Date: 2013-04-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are Fe, Fe 2+ , Fe 3+ Removal of NH 4 + -N, NO 3 - -N, NO 2 - -N adsorption catalytic method, but with these forms of Fe element as the catalyst, there is a problem that it is difficult to separate the conversion product of Fe from the effluent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Combine tannic acid with FeCl 3 ·6H 2 O was prepared as a solution with a concentration of 0.001mol / L, and the FeCl 3 The solution is added to the tannic acid solution, and the tannic acid solution and FeCl 3 The volume ratio of the solution is 1:40, fully reacted for 20 minutes, and the reacted mixed solution contains blue-black flocs;

[0033] 2) NaHCO 3 Dissolve the solid in distilled water and prepare NaHCO with a concentration of 0.65mol / L 3 solution;

[0034] 3) NaHCO in step 2) 3 The solution is slowly added to the tannic acid and FeCl in step 1) with a dropper 3 In the mixed solution containing blue-black flocs after the reaction, add slowly while stirring and measure the pH value of the mixed solution with a pH meter, stop dropping when the pH value of the mixed solution reaches 7.0;

[0035] 4) Centrifuge the mixed solution containing blue-black flocs in step 3) at 4000rpm for 5min in a centrifuge;

[0036] 5) Wash the blue-black precipitate in step...

Embodiment 2

[0040] 1) Combine tannic acid with FeCl 3 ·6H 2 O was prepared as a solution with a concentration of 0.01mol / L, and the FeCl 3 The solution is added to the tannic acid solution, and the tannic acid solution and FeCl 3 The volume ratio of the solution is 1:25, fully reacted for 10 minutes, and the reacted mixed solution contains blue-black flocs;

[0041] 2) NaHCO 3 Dissolve the solid in distilled water and prepare NaHCO with a concentration of 0.65mol / L 3 solution;

[0042] 3) NaHCO in step 2) 3 The solution is slowly added to the tannic acid and FeCl in step 1) with a dropper 3 In the mixed solution containing blue-black flocs after the reaction, add slowly while stirring and measure the pH value of the mixed solution with a pH meter, stop dropping when the pH value of the mixed solution reaches 7.0;

[0043] 4) Centrifuge the mixed solution containing blue-black flocs in step 3) at 3000rpm for 5min in a centrifuge;

[0044] 5) Wash the blue-black precipitate in step ...

Embodiment 3

[0048] 1) Combine tannic acid with FeCl 3 ·6H 2 O was prepared as a solution with a concentration of 0.02mol / L, and the FeCl 3 The solution is added to the tannic acid solution, and the tannic acid solution and FeCl 3 The volume ratio of the solution is 1:10, fully react for 10 minutes, and the reacted mixed solution contains blue-black flocs;

[0049] 2) NaHCO 3 Dissolve the solid in distilled water and prepare NaHCO with a concentration of 0.65mol / L 3 solution;

[0050] 3) NaHCO in step 2) 3 The solution is slowly added to the tannic acid and FeCl in step 1) with a dropper 3 In the mixed solution containing blue-black flocs after the reaction, add slowly while stirring and measure the pH value of the mixed solution with a pH meter, stop dropping when the pH value of the mixed solution reaches 7.0;

[0051] 4) Centrifuge the mixed solution containing blue-black flocs in step 3) at 3000rpm for 5min in a centrifuge;

[0052] 5) Wash the blue-black precipitate in step 4)...

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Abstract

The invention discloses a novel adsorption catalyst for nitrogen removal of sewage and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing FeC13 solution with tannin solution according to a certain proportion, and regulating pH of the mixed solution to 7.0 by adding NaHCO3; then carrying out centrifuging, distilled water washing and recentrifuging on the neutral mixed solution; and carrying out freeze drying on solid matters obtained by centrifugal separation so as to obtain a novel ferric tannate adsorption catalysis material. The novel adsorption catalyst for the nitrogen removal of the sewage and the preparation method thereof have the advantages of simplicity in operation, economy, applicability and the like; due to a prepared ferric tannate adsorption catalyst, NH4<+>- and NO2<->-N in water can be simultaneously absorbed and converted into N2; and the adsorption catalyst has the advantages of rich pore structures, high stability, good adsorption and nitrogen removal catalyzing effects and wide applicable range and can be widely applied to the nitrogen removal of the sewage.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a novel adsorption catalyst for denitrification of sewage and a preparation method thereof. Background technique [0002] Sewage contains nutrients such as ammonia nitrogen and nitrite nitrogen, which is one of the main reasons for the eutrophication of the receiving water body. At present, sewage denitrification methods include physical and chemical methods and biochemical methods. The biological denitrification method is easily affected by the C / N and temperature conditions of the sewage, and the microbial culture time is long, the denitrification reaction process is slow, the required bioreactor volume is large, and the energy consumption is high. Physicochemical methods mainly include adsorption and catalytic methods. The pure adsorption method has the problem that the adsorbent needs to be regenerated after saturation, while the pure catalytic method has the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J20/22B01J20/30C02F1/28C02F101/16
Inventor 刘俊新张瑞娜李琳
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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