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Method for treating high-concentration nitrogenous organic wastewater

An organic wastewater and high-concentration technology, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as low biochemical reaction activity, low electrolysis reaction efficiency, and large sludge production

Active Publication Date: 2012-12-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the problems existing in the existing treatment methods of nitrogen-containing high-concentration organic wastewater, the present invention provides a method for treating nitrogen-containing high-concentration organic wastewater, which removes nitrogen through a combination of highly integrated chemical precipitation, biochemical reaction and electrolytic hydrogen production reaction The method is used to treat nitrogen-containing high-concentration organic wastewater, and overcome the problems of large sludge production, low biochemical reaction activity, and low electrolysis reaction efficiency in a single chemical precipitation reaction

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  • Method for treating high-concentration nitrogenous organic wastewater
  • Method for treating high-concentration nitrogenous organic wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Chemical precipitation reaction:

[0041] The nitrogen-containing organic waste water to be treated is carried out high-efficiency precipitation reaction in the precipitation reactor, the ammonia nitrogen concentration of the nitrogen-containing organic waste water to be treated in the present embodiment is 4000mg / L, with MgCl 2 ﹒ 6H 2 O and Na 2 HPO 4 ﹒ 12H 2 O is a precipitant, according to the molar ratio Mg 2+ : NH 4 + :PO 4 3- Add a precipitant to 1.4:1:1, adjust the pH value to 10, mix and stir the reaction time for 30min, and the temperature is 30°C. Through chemical precipitation, the ammonia nitrogen component to be treated in the influent is removed, and the precipitation and clarification reaction Go to the next step after completion;

[0042] (2) Two-stage serial SBR biochemical reactor reaction:

[0043] The concentration of ammonia nitrogen in the wastewater treated by sedimentation is reduced to 380mg / L, and the effluent from sedimentation...

Embodiment 2

[0049] (1) Chemical precipitation reaction:

[0050] The nitrogen-containing organic waste water to be treated is carried out high-efficiency precipitation reaction in the precipitation reactor, the ammonia nitrogen concentration of the nitrogen-containing organic waste water to be treated in the present embodiment is 3000mg / L, with MgCl 2 ﹒ 6H 2 O and Na 2 HPO 4 ﹒ 12H 2 O is a precipitant, according to the molar ratio Mg 2+ : NH 4 + :PO 4 3- Add a precipitant to 1.4:1:1, adjust the pH value to 11, mix and stir for 35 minutes, and the temperature is 25°C. Through chemical precipitation, the ammonia nitrogen component to be treated in the influent is removed, and the precipitation and clarification reaction Go to the next step after completion;

[0051] (2) Two-stage serial SBR biochemical reactor reaction:

[0052] The concentration of ammonia nitrogen in the wastewater treated by sedimentation is reduced to 300mg / L, and the effluent from sedimentation treatment pa...

Embodiment 3

[0057] (1) Chemical precipitation reaction:

[0058] The nitrogen-containing organic wastewater to be treated is subjected to a high-efficiency precipitation reaction in a precipitation reactor. The ammonia nitrogen concentration of the nitrogen-containing organic wastewater to be treated in this embodiment is 1000mg / L, and the concentration of MgCl 2 ﹒ 6H 2 O and Na 2 HPO 4 ﹒ 12H 2 O is a precipitant, according to the molar ratio Mg 2+ : NH 4 + :PO 43- Add a precipitant to 1.4:1:1, adjust the pH value to 9, mix and stir the reaction time for 25 minutes, and the temperature is 35°C. Through chemical precipitation, the ammonia nitrogen component to be treated in the influent is removed, and the precipitation and clarification reaction Go to the next step after completion;

[0059] (2) Two-stage serial SBR biochemical reactor reaction:

[0060] The concentration of ammonia nitrogen in the wastewater treated by precipitation is reduced to 100mg / L, and the effluent of p...

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Abstract

The invention discloses a method for treating high-concentration nitrogenous organic wastewater, which belongs to the field of wastewater treatment, and includes the steps: (1) performing high-efficiency precipitation reaction for nitrogenous organic wastewater to be treated in a precipitation reactor, wherein MgCl2 6H2O (magnesium chloride hexahydrate) and Na2HPO4 12H2O (disodium hydrogen phosphate) are utilized as precipitators, and the precipitators are added according to the molar ratio of Mg2+:NH4+:PO43- equal to 1.4:1:1; (2) enabling effluent after precipitation treatment to pass through two-stage SBR (sequencing batch reactor activated sludge process) biochemical reactors in series connection, and filling surface nitrifying bacteria immobilized suspended filler in the SBR biochemical reactors; and (3) enabling effluent from the SBR biochemical reactors pass through an electrolytic hydrogen making reactor and go through electrolytic denitrification reaction, so that ammonia nitrogen in the wastewater is finally removed by being electrolyzed into nitrogen and hydrogen. The method overcomes the problems of high sludge production, low biochemical reaction activity, low electrolytic reaction efficiency in single chemical precipitation reaction, has the advantages of high ammonia nitrogen removal efficiency, low operational cost, low sludge production and high automation degree, and is capable of more effectively realizing harmless treatment of the nitrogenous organic wastewater.

Description

technical field [0001] The present invention relates to the field of organic wastewater treatment methods, more specifically, it relates to a method for treating high-concentration nitrogen-containing organic wastewater, which is a combination of three reaction units using highly integrated chemical precipitation, biological methods and electrolytic hydrogen production The process directly treats high-concentration organic wastewater containing nitrogen, and can make the ammonia nitrogen concentration of the final effluent without subsequent deep nitrogen removal treatment. Background technique [0002] Many types of chemical or pharmaceutical wastewater and landfill leachate contain high concentrations of ammonia nitrogen and have low biodegradability. These high concentrations of nitrogen-containing wastewater usually cause impacts on biochemical treatment facilities. Therefore, generally use Stripping (or stripping), precipitation, membrane absorption, wet oxidation and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/461C02F101/38
Inventor 丁原红任洪强王庆牛川肖椿
Owner NANJING UNIV