Method of removing ammonia nitrogen in water by using electrodialysis

A technology of electrodialysis and water removal, applied in the separation method and dispersed particle separation, etc., can solve the problems of poor biochemical ammonia removal effect, many disinfection by-products, easy air pollution, etc., achieve stable operation, few influencing factors, and reduce pollution Effect

Inactive Publication Date: 2006-06-14
HARBIN INST OF TECH
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Problems solved by technology

[0003] In order to solve the problems that the existing method for removing ammonia nitrogen in water is easy to pollute the air, have many disinfection by-products, low removal rate, and high cost, and the problem that the biological method has poor biochemical ammonia removal effect under low temperature conditions, it provides a method using electrodialysis The method for removing ammonia nitrogen in water, the technical scheme adopted to solve this technical problem is as follows:

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  • Method of removing ammonia nitrogen in water by using electrodialysis
  • Method of removing ammonia nitrogen in water by using electrodialysis

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specific Embodiment approach 1

[0012] Specific embodiment one: the present embodiment adopts electrodialysis to remove the method for ammonia nitrogen in water and comprises the following steps:

[0013] Step 1. Coagulate, settle or filter the feed water or waste water output by the rotameter 5; the function of this treatment is to remove suspended components in the water, and aluminum sulfate, polyaluminum, polyaluminium-iron or polysilicon-alumina can be added (5~40mg / L) coagulant, and 1.5~5.0mg / L coagulant can also be added at the same time. The coagulant uses activated silicic acid or polyacrylamide to strengthen the removal of suspended solids in the water; sedimentation uses a sedimentation tank; Filtration measures adopt ultrafiltration membrane, the pore size of ultrafiltration membrane is 0.45μm, and quartz sand, ceramsite, anthracite, garnet, iron ore or activated carbon can also be used for filtration;

[0014] Step 2. Oxidize the water in step 1; oxidize the organic nitrogen and coexisting organ...

specific Embodiment approach 2

[0017] Specific implementation mode two: combination figure 2 The difference between this embodiment and the specific embodiment 1 is that the method also includes: detecting the water quality of the water after the treatment in the first step and the second step of the specific embodiment, and then entering the b step for judgment, and when the judgment result, the dissolved matter in the water When it is in the range of 2000-5000mg / L, carry out the c-step adsorption and ion exchange treatment, the adsorbent treatment uses activated carbon, the ion-exchanger treatment uses zeolite or anion exchange resin, and the treated water goes to the d-step to test the water quality; when the b-step If the judgment result is no, go directly to step d to test the water quality, and then go to step e to make a judgment. When the COD in the water is within the range of 5-50 mg / L, go to step f to carry out activated carbon or biological activated carbon and oxidation and adsorption treatment...

specific Embodiment approach 3

[0018] Specific embodiment 3: The difference between this embodiment and specific embodiments 1 and 2 is that the NH in the feed water needs to be treated 3 -N concentration is 9.86mg / L, pH is 7.86, calcium ion is 34.43mg / L, magnesium ion is 7.61mg / L, conductivity is 430mS / m, water temperature is 17.8℃, water flow is controlled at 58.85mL / s, water The flow rate is 10cm / s, the current in the electrodialysis device 7 is 0.40A, and the applied voltage is 220V. After being treated by the electrodialysis device 7 , the ammonia nitrogen content in the water outlet pipe 8 was detected to be 0.86 mg / L, and the ammonia nitrogen removal rate was 91.28%. Other steps are the same as in the first embodiment.

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Abstract

The present invention relates to a method for removing ammonia nitrogen is water by adopting electrodialysis. Said method includes the following steps: (1), adopting the process of coagulation, sedimentation or filtration to treat raw material; (2), making oxidation treatment; and (3), feeding the water undergone the process of oxidation treatment into electrodialysis equipment to make ammonia nitrogen removal treatment, its electric current is 0.1-5A, voltage is 5-240V, it adopts pole-reversing method, its pH value is controlled in the range of 5-11, and the water flow rate can be controlled.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen in water. Background technique [0002] The treatment technology of ammonia nitrogen in water supply and wastewater has always been the focus of research by scholars from all over the world. There are many ways to remove ammonia nitrogen in water, and the methods currently used in industry mainly include biological denitrification method, air stripping method, break point chlorination method, ion exchange method and so on. The biological denitrification method is suitable for treating low-ammonia-nitrogen concentration wastewater containing organic matter, but it requires sufficient carbon sources in the water and other environments and conditions suitable for the survival of microorganisms. However, the above-mentioned environment is difficult to maintain, the conditions are difficult to achieve, and the operation, maintenance and management are complicated. For high-concentration inorga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
Inventor 马军秦文跃张佳发
Owner HARBIN INST OF TECH
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