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Ammonian remover used for treating highly concentrated ammonian wastewater and treatment method

A technology for ammonia nitrogen wastewater and treatment methods, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of inability to treat wastewater discharge standards, high residual phosphorus concentration, and the cost of ammonia nitrogen removal High-level problems, to achieve the effect of fast and efficient wastewater treatment, strong wastewater adaptability, and easy control of reaction conditions

Inactive Publication Date: 2009-10-14
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another purpose of the present invention is to solve the problem that the current ammonium magnesium phosphate precipitation method has a high cost of removing ammonia nitrogen, although a higher ammonia nitrogen removal effect can be obtained, but it still cannot be treated to the wastewater discharge standard, and the residual phosphorus concentration after treatment is high. Provide A method that can greatly reduce the cost of wastewater treatment and make the concentration of ammonia nitrogen and residual phosphorus in the effluent reach the discharge standard

Method used

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  • Ammonian remover used for treating highly concentrated ammonian wastewater and treatment method

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: Add 2m in the pH pre-adjustment sedimentation tank 3 Alkaline soap wastewater, after adding sodium hydroxide to adjust the pH = 8, the wastewater enters the MAP sedimentation tank, and then presses Mg 2+: NH 4 + :PO 4 3- =1.6:1:1.6 Add magnesium chloride and disodium hydrogen phosphate, adjust pH=9, stir for 30 minutes, let stand for precipitation for 1 hour, and the resulting precipitate is decomposed by OH in the MAP decomposition chamber - : NH 4 + =1.1:1 Molar ratio is added sodium hydroxide, control decomposition temperature at 95 ℃, heating and decomposing for 3h, decomposition product is in the decomposition product dissolution chamber according to the molar ratio of sodium hydroxide added in hydrochloric acid and MAP decomposition chamber namely H + :OH - Add hydrochloric acid to dissolve at a ratio of 1:1, stir and mix to form a slurry to make ammonia nitrogen remover.

Embodiment 2

[0032] Embodiment 2: Add 2m in the pH pre-adjustment sedimentation tank 3 Ammonium bicarbonate precipitates and washes the waste water, adds sodium hydroxide to adjust the pH=8.2, the waste water enters the MAP sedimentation tank, and then presses Mg 2+ : NH 4 + :PO 4 3- =1.5:1:1.5 Add magnesium chloride and disodium hydrogen phosphate, adjust pH=9, stir for 30 minutes, let stand for precipitation for 1 hour, and the resulting precipitate is decomposed by OH in the MAP decomposition chamber - : NH 4 + =1.2:1 Molar ratio is added sodium hydroxide, control decomposition temperature at 100 ℃, heating and decomposing for 3h, decomposition product is in the decomposition product dissolution chamber according to the molar ratio of sodium hydroxide added in hydrochloric acid and MAP decomposition chamber namely H + :OH - Add hydrochloric acid to dissolve at a ratio of 0.8:1, stir and mix to form a slurry to make ammonia nitrogen remover.

[0033] The embodiment that uses the ...

Embodiment 3

[0035] Embodiment 3: Add 2m in the pH pre-adjustment sedimentation tank 3 Alkaline soap wastewater, then add 23kg of sodium hydroxide to adjust the pH to 8.5, let the wastewater pass into the MAP sedimentation tank after standing for precipitation, add 95% of the No. 1 ammonia nitrogen remover, adjust the pH to 9, and let it stand after 30 minutes of reaction 1h, take the supernatant and measure the ammonia nitrogen concentration to be 55mg / L, then enter the MAP sedimentation tank again, add the remaining 5% of the No. 1 ammonia nitrogen remover, the reaction conditions are the same as in the MAP sedimentation tank, and the residual ammonia nitrogen concentration It is 8.7mg / L, and the waste water enters the dephosphorization tank again, according to Mg 2+ :PO 4 3- =5:1 Add magnesium chloride, adjust pH=10, react for 30 minutes, let stand for 30 minutes, the residual phosphorus concentration in the wastewater is 0.7mg / L.

[0036] The sediment produced in the MAP sedimentati...

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Abstract

The invention relates to an ammonian remover used for treating highly concentrated ammonian wastewater and a treatment method, belonging to the technical field of wastewater treatment. The ammonian remover is prepared in such a way that magnesium salts and phosphates are added into the ammonian wastewater with set quantity according to a rule of Mg:NH4:PO4=1.4-1.6:1:1.4-1.6 for reaction to generate precipitate, the precipitate is decompounded in an MAP decomposition chamber, and decomposed products are dissolved by hydrochloric acid and is evenly mixed to be of slime shape. The treatment method using the ammonian remover is characterized by comprises the following steps: the ammonian wastewater with set quantity primarily enters a pH pre-adjusting precipitation tank and enters an MAP precipitation tank later, the ammonian remover is added for reacting with the ammonian wastewater and the ammonian wastewater enters an MAP secondary precipitation tank or not according to the ammonian concentration of supernatant fluid, at last the ammonian wastewater enters a phosphorus removing tank for removing phosphorus; generated MAP is sent to the MAP decomposition chamber for being decompounded, and decomposed products and precipitate produced in the phosphorus removing tank are sent to a decomposed product dissolving chamber for dissolving. The treatment method has low cost of wastewater treatment without secondary pollution or environment factor interference; and ammonian and surplus phosphorus concentration in treated wastewater reaches national wastewater primary emission standard.

Description

technical field [0001] The invention relates to an ammonia nitrogen removing agent and a treatment method for treating high-concentration ammonia nitrogen wastewater, belonging to the technical field of sewage treatment. Background technique [0002] Ammonia nitrogen mainly comes from urban domestic sewage and industrial wastewater. The concentration of ammonia nitrogen in urban domestic sewage is low, and the wastewater discharge standard can be reached through appropriate biochemical treatment; the concentration of ammonia nitrogen in industrial wastewater is high, and it comes from a wide range of sources. Wastewater discharged from different types of factories contains nitrogen The situation is quite different. Factories that produce high-concentration ammonia-nitrogen wastewater can be divided into two categories: one is nitrogen-containing product production plants, and the other is nitrogen-containing product use or processing plants, such as nitrogen fertilizer plant...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C01B25/45
Inventor 黄海明肖贤明晏波
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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