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Method and device for treating high ammonia nitrogen water

A kind of treatment equipment, high ammonia nitrogen technology, applied in the direction of neutralization water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption, high operating cost, and difficulty in normal growth of organisms And other issues

Inactive Publication Date: 2009-12-16
TIANJIN HUANHAI JINGYUAN HI TECH DEV
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  • Description
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AI Technical Summary

Problems solved by technology

However, this method consumes a lot of energy, and the treatment cost is very high, and the quality of the effluent water cannot meet the discharge standard (the first-level discharge standard of ammonia nitrogen is 15mg / L); while the use of biological treatment requires a large amount of oxygen consumption, generally oxidizing 1mg / L ammonia nitrogen Requires 5mg / L of dissolved oxygen, so the operating cost is very high
[0004] Moreover, high ammonia nitrogen has a strong inhibitory effect on organisms in wastewater, making it difficult for organisms to grow normally
With the rapid development of my country's economy, due to the lack of economical and efficient treatment technology for high-concentration ammonia-nitrogen industrial wastewater, many enterprises have excessive discharge or illegal discharge, resulting in large-scale pollution of water bodies, and more than 70% of water bodies are eutrophic.

Method used

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  • Method and device for treating high ammonia nitrogen water
  • Method and device for treating high ammonia nitrogen water
  • Method and device for treating high ammonia nitrogen water

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The above method, wherein T1=20°C, T2=20°C; P1=0.15MPa, P2=0.08MPa; pH1=9.5.

[0038] The temperature of the treated water is 20°C, the concentration of ammonia nitrogen is 10000mg / L-12000mg / L, and the pH of the treated wastewater is adjusted to 9.5 with lime solution. The said containing H + The absorption liquid is 5% hydrochloric acid aqueous solution, pH is less than 0. Using this device for treatment, the concentration of ammonia nitrogen in the effluent is 15mg / L. When the ammonium salt concentration in the absorbing liquid reaches 20%, it is sent to the heating evaporation equipment to obtain solid ammonium chloride.

Embodiment 2

[0039] Embodiment 2, the above method, wherein T1=30°C, T2=30°C; P1=0.2MPa, P2=0.1MPa; pH1=10.

[0040] The temperature of the treated water is 30°C, the concentration of ammonia nitrogen is 6000mg / L-8000mg / L, and the pH of the treated wastewater is adjusted to 10 by using 30% caustic soda solution. The said containing H + The absorption liquid is 7% nitric acid aqueous solution, pH is less than 0. Using this device for treatment, the concentration of ammonia nitrogen in the effluent is 10mg / L. When the ammonium salt concentration in the absorption liquid reaches 25%, it is sent into the heating evaporation equipment to obtain solid ammonium nitrate,

Embodiment 3

[0041] Embodiment 3, the above method, wherein T1=40°C, T2=40°C; P1=0.12MPa, P2=0.05MPa; pH1=10.5.

[0042] The temperature of the treated water is 40°C, the concentration of ammonia nitrogen is 1000mg / L-3000mg / L, and the pH of the treated wastewater is adjusted to 10.5 by using 50% caustic soda solution. The said containing H + The absorption liquid is 10% sulfuric acid aqueous solution, pH is less than 0. Using this device for treatment, the concentration of ammonia nitrogen in the effluent is 8mg / L. When the ammonium salt concentration in the absorbing liquid reaches 30%, it is sent to the heating and evaporating equipment to obtain solid ammonium sulfate.

[0043] see figure 2 , figure 2 It is a schematic diagram of the series connection of multi-stage gas-water separation membrane units. The outlet of the first-stage booster pump 1 is connected to the feed-liquid inlet of the first-stage gas-water separation membrane unit 2 (a certain number of gas-water separation...

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Abstract

The invention belongs to a waste water treatment method in the field of environmental protection and the field of complete devices. A method for treating high ammonia nitrogen industrial waste water comprises the steps of firstly adjusting the pH of the treated waste water to more than 9, and raising the form proportion of free ammonia (NH3) of ammonia nitrogen in water; and the method is characterized by also comprising the following steps: filtering the free ammonia (NH3) in the waste water through an air-water separation membrane so that the free ammonia (NH3) enters absorption liquid containing H and reacts with the H in the absorption liquid to generate ammonium salt, and delivering the absorption liquid containing the ammonium salt to a heating evaporation device to obtain solid ammonium salt. The method and the device have the advantages that the residual ammonia nitrogen in the water separated by the air-water separation membrane can reach below 15 milligrams per liter and 8 milligrams per liter, and about 99.9 percent of ammonia nitrogen in the waste water is reclaimed to form the ammonium salt and becomes a clean industrial raw material.

Description

technical field [0001] The invention belongs to the field of wastewater treatment methods in the field of environmental protection, and is a solution and a complete set of equipment for problems such as difficult treatment of high-concentration ammonia nitrogen industrial wastewater, environmental pollution, and eutrophication of water bodies. Background technique [0002] The eutrophication of the surface water body has caused the deterioration of the water environment, the decline of drinking water quality, and the frequent occurrence of offshore red tides. The key factor causing the eutrophication of the water body is the entry of a large amount of nutrients into the water body, and the discharge of high-concentration ammonia nitrogen wastewater is the primary factor causing the eutrophication. [0003] Ammonia nitrogen is the main pollution component of various industrial wastewater. The industries that produce industrial wastewater containing high concentration ammonia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/00C02F1/66C02F1/44
Inventor 孙胜利周新生张根旺
Owner TIANJIN HUANHAI JINGYUAN HI TECH DEV
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