Method for treating low-concentration ammonia-nitrogen wastewater or feed liquid

A low-concentration ammonia nitrogen and treatment method technology, applied in the field of wastewater or feed liquid treatment, can solve the problems of reducing the effect of desorbing ammonia nitrogen, reducing the pH value of the regeneration solution, and air pollution

Active Publication Date: 2014-12-17
TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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Problems solved by technology

For example, the removal of used regeneration liquid by distillation requires steam as a heat source, which is generally limited by the lack of steam in sewage plants; air pollution is easily caused by stripping, and the trace amount of carbon dioxide in the air and most of the hydrogen in the regeneration liquid Sodium oxide reacts to generate sodium carbonate solution, thereby reducing the pH value of the regeneration solution and reducing the effect of desorbing ammonia nitrogen; in addition, if the ammonia nitrogen in the original wastewater is deeply removed, the ammonia nitrogen in the absorption complete solution needs to be reduced to a very low level, which requires a large amount of The air is blown off (for example, to remove 90-99% of ammonia nitrogen from highly alkaline wastewater, the required gas-liquid volume flow ratio is about 2000-6000), and it needs to consume 15-40 kWh / ton of wastewater

Method used

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  • Method for treating low-concentration ammonia-nitrogen wastewater or feed liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Biochemical treatment effluent from a petrochemical plant, pH=6~8, yellow, slightly turbid, water quality is COD Cr 50mg / L, ammonia nitrogen 50mg / L. After ultrafiltration (molecular weight cut-off: 6000MWCO), the waste water is still yellow, but clear and transparent, and the surface tension increases to 68mN / m. The pretreated wastewater enters the natural zeolite adsorption device, and the wastewater flow rate SV is controlled to 30min -1 , after zeolite adsorption treatment, the water quality of the effluent is pH=6~8, yellow, clear, COD Cr 40mg / L, ammonia nitrogen 3.6mg / L.

[0075] Taking 7mg / L as the breakthrough point of zeolite adsorption, when this point is reached, the average ammonia nitrogen value of the overall effluent of the adsorption column is measured to be 4.7mg / L, which meets the national first-class A discharge standard; The solution (density at room temperature is 1.07) after the alkali is adjusted to pH = 12.0 is used to regenerate the zeolite. T...

Embodiment 2

[0077] Biochemical treatment effluent of a municipal sewage treatment plant, pH=6~8, colorless, with suspended solids, water quality is COD Cr 58mg / L, ammonia nitrogen 20mg / L. After microfiltration (average pore size is 0.2μm) and ultrafiltration treatment (molecular weight cut-off is 6000MWCO), the surface tension of wastewater is increased to 68mN / m, and then directly enters the zeolite adsorption device. The flow rate of wastewater is controlled to be 10min-1. After zeolite treatment, The water quality of the effluent is pH=6~8, colorless, clear, COD Cr 40mg / L, ammonia nitrogen 2.5mg / L.

[0078] Taking 8mg / L as the breakthrough point of zeolite adsorption, when this point is reached, the average ammonia nitrogen value of the adsorption column’s overall effluent is measured to be 4.6mg / L, which meets the national first-class A emission standard; use 6%NaCl with pH=11.5 + 5% sodium glycine solution (density 1.06 at room temperature) to regenerate the zeolite, the regenerati...

Embodiment 3

[0080] The biochemical treatment effluent of the sewage treatment plant of an antibiotic production plant, pH=6~8, colorless, with suspended solids, and the water quality is COD Cr 45mg / L, ammonia nitrogen 96mg / L. After microfiltration (average pore size: 0.2μm) and ultrafiltration (molecular weight cut-off: 6000MWCO), the wastewater is treated with surface tension increased to 69mN / m, and then directly enters the zeolite adsorption device, controlling the wastewater flow rate SV to be 10min -1 , after zeolite treatment, the water quality of the effluent is pH=6~8, colorless, clear, COD Cr 41mg / L, ammonia nitrogen 3.0mg / L.

[0081] With 12mg / L as the breakthrough point of zeolite adsorption, when this point is reached, the average ammonia nitrogen value of the overall effluent of the adsorption column is measured to be 4.6mg / L, which meets the national first-class A discharge standard; 20%NaCl with pH=11.5 is used +Na 2 CO 3 The solution (with a density of 1.18) regenerate...

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Abstract

The invention relates to a method for treating a low-concentration ammonia-nitrogen wastewater or feed liquid. The method comprises the steps: firstly, pre-treating the low-concentration ammonia-nitrogen wastewater or feed liquid, removing impurities in the wastewater or feed liquid, adjusting the pH of the wastewater or feed liquid to 6-7.5, and increasing the surface tension to 40 mN/m or even 65 mN/m or more; then carrying out selective adsorption treatment on the pretreated low-concentration ammonia-nitrogen wastewater or feed liquid with zeolite, making the ammonia-nitrogen average concentration of the wastewater or feed liquid subjected to adsorption less than a predetermined value, when the ammonia-nitrogen average concentration of the wastewater or feed liquid after the adsorption treatment reaches the predetermined value, carrying out regeneration treatment on zeolite by utilizing a regeneration liquid, and thus obtaining an ammonia-nitrogen enriched regeneration liquid; followed by allowing the ammonia-nitrogen enriched regeneration liquid to enter a gas membrane separation device, and carrying out deamination treatment; and finally carrying out concentration treatment on the ammonia-nitrogen removed regeneration liquid, and thus obtaining a recyclable regeneration liquid. The method has the advantages of simple operation, small energy consumption, low operation cost, no secondary pollution, economy and environmental protection.

Description

technical field [0001] The invention relates to a waste water or feed liquid treatment method, in particular to a method for removing and recovering ammonia nitrogen from low-concentration ammonia nitrogen waste water or feed liquid, and belongs to the field of environmental protection and waste water treatment methods. Background technique [0002] In recent years, with the rapid development of petrochemical, coal chemical, fine chemical, fertilizer, pharmaceutical, metallurgy, electronics and other industries, the resulting ammonia nitrogen wastewater has also become one of the restrictive factors for the development of the industry. According to relevant statistics, the annual discharge of ammonia nitrogen in my country exceeds 300,000 tons, which not only seriously pollutes the environment, but also causes a huge waste of resources. With the enhancement of people's awareness of environmental protection and the deepening of the country's awareness of environmental protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F9/04C02F9/06
Inventor 秦英杰崔东胜刘立强周伟蔡腾豪
Owner TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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