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A method for electrochemical denitrification and dephosphorization of sewage

A sewage electricity and chemical technology, applied in chemical instruments and methods, inorganic chemistry, water/sewage treatment, etc., can solve the problems of electrode surface scaling and passivation, low removal rate of ammonia nitrogen, etc., to slow down plate passivation, high Nitrogen and phosphorus removal rate, beneficial to the effect of waste resource utilization

Active Publication Date: 2020-10-30
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for electrochemical denitrification and phosphorus removal of sewage, aiming at solving the problems of ammonia nitrogen caused by the imbalance of nitrogen-phosphorus ratio in sewage (the amount of phosphorus is low) when the MAP method is used to treat sewage. The technical problem of low removal rate; and the problem that the existing electrochemical ammonium magnesium phosphate method is easy to cause fouling and passivation on the electrode surface

Method used

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  • A method for electrochemical denitrification and dephosphorization of sewage
  • A method for electrochemical denitrification and dephosphorization of sewage
  • A method for electrochemical denitrification and dephosphorization of sewage

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Embodiment 1

[0054] At a concentration of 0.010molL -1 In the simulated wastewater of ammonium dihydrogen phosphate, NaCl was added as a supporting electrolyte to make the concentration reach 0.020molL -1 , adjust the pH of the solution to 7.0, the stirring rate is 200rpm, the pulse power supply voltage is +10V, -10V, ±10V respectively, the frequency is 0.04hz, the bias is 0.0%, and the electrolysis time is 180min respectively. A Mg / Pt electrode reactor is used. The experiment uses three waveforms: A (﹢10V), B (-10V), and C (±10V) (such as Figure 2a -c shown).

[0055] When the voltage is positive, the first electrode made of magnesium is at a high potential, and a precipitation reaction occurs in the solution. When the voltage is negative, when the second electrode made of platinum is at a low potential, an oxidation reaction occurs in the solution. During the experiment, samples were taken every 30 minutes to detect the concentration of ammonia nitrogen and phosphate to calculate th...

Embodiment 2

[0061] Set three gradients of ammonium ion to phosphate ion molar ratio 1:0.2, 1:0.5 and 1:1, where the concentration of ammonia nitrogen is 0.010molL -1 , the concentration of phosphate ion is 0.002molL respectively -1 , 0.005molL -1 , 0.010molL -1 . NaCl is used as a supporting electrolyte, so that the concentration is 0.020molL -1 , adjust the pH of the solution to 7.0, the stirring rate is 200rpm, the pulse power supply voltage is ±10V, the frequency is 0.02hz, the bias is 0.0%, and the electrolysis time is 180min. Such as Figure 5a As shown, under the conditions of N:P 1:0.2, 1:0.5 and 1:1, after 180 min of reaction, the final removal rates of ammonia nitrogen were 32.2%, 49.5% and 70.8%, respectively. Such as Figure 5b As shown, under the conditions of N:P being 1:0.2 and 1:0.5 respectively, the final removal rates of phosphate were 96.8% and 98.2% respectively when reacting for 60 minutes. When N:P was 1:1, phosphoric acid was The root removal rate was 38%, and...

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Abstract

The invention discloses a sewage electrochemical nitrogen and phosphorus removal method. The method comprises the following steps: 1) at least setting one group of electrodes in the sewage containing ammonium ions and phosphate radical ions, wherein each group of the electrodes comprises a first electrode and a second electrode, and the material of the first electrode is magnesium or magnesium alloy; 2) enabling the first and second electrodes to be positioned in high potential and low potential alternately through a bidirectional pulse power supply; 3) while the first electrode is positioned in the high potential, and the second electrode is positioned in the low potential, releasing out soluble Mg<2+> by electrolysis of the first electrode, and generating hydroxyl ions by the second electrode, rising the pH value of the sewage, and promoting the reaction of the Mg<2+> in solution and the ammonium ions and phosphate radical ions in water to generate a magnesium ammonium phosphate sediment; and 4) while the second electrode is positioned in the high potential, the ammonium ions are oxidized, and the first electrode is positioned in the low potential, generating H2 on the surface, and relieving the electrode passivation. The method is capable of realizing the recovery of nitrogen and phosphorus in the water, and further improving the nitrogen and phosphorus removal rate, and has the better adaptability to each type of the sewage.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for electrochemical denitrification and phosphorus removal of sewage. Background technique [0002] Nitrogen and phosphorus are one of the main causes of eutrophication in water bodies. Generally speaking, when the nitrogen content of the water body is greater than 0.2 mg / L and the phosphorus content is greater than 0.02 mg / L, the water body will become eutrophic. The eutrophication of the water body will cause a large number of algae to multiply. On the one hand, the dissolved oxygen in the water will be consumed, resulting in the death of a large number of aquatic animals and plants such as fish and shrimp in the water body. Under normal circumstances, 1mg of ammonia nitrogen is converted into nitrate nitrogen under the catalysis of nitrifying bacteria, which needs to consume 4.57mg of dissolved oxygen in water. On the other hand, the decomp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/72C01B25/45C05B7/00C02F101/16
CPCC01B25/451C02F1/001C02F1/4672C02F2001/007C02F2101/16C05B7/00
Inventor 曾晓岚丁文川厉晓宇罗万申王健康张玉权国卿徐晓棠
Owner CHONGQING UNIV
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