Method for reducing ammonia nitrogen content of platinum and palladium production wastewater in short process

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a short-process method for reducing the ammonia nitrogen content of platinum and palladium production wastewater. The method comprises the following steps: putting an ultra-fine bubble generator into platinum-palladium production wastewater, carrying out ultra-fine bubble oxidation treatment on the waste liquid, generating hydroxyl radicals by ultra-fine bubbles in the waste liquid, deeply oxidizing ammonia nitrogen compounds in the waste liquid until nitrogen and water are generated, and directly overflowing the nitrogen from the solution. The method is suitable for removing nitrogen-containing organic matters, ammonia water and ammonium ions in the platinum-palladium production wastewater. The method has the advantages that air is used as a raw material, no extra chemicals are needed, no secondary pollutants are generated, the denitrification efficiency is high, the operation cost is low, and ammonia nitrogen in wastewater is degraded in an environment-friendly manner.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a method for reducing ammonia nitrogen content in platinum and palladium production wastewater in a short process. Background Art

[0002] Ammonia nitrogen is one of the common pollutants in platinum and palladium production wastewater, mainly from ammonium salts, ammonia water and other ammonia nitrogen compounds used in the platinum and palladium leaching and separation process. Wastewater containing ammonia nitrogen will have serious impacts on the environment, such as eutrophication of water bodies and destruction of ecosystems, and pose potential hazards to human health. Therefore, reducing the ammonia nitrogen content in platinum and palladium production wastewater is an urgent problem to be solved in the current environmental protection field.

[0003] In recent years, researchers have proposed a series of methods for treating ammonia nitrogen in platinum and palladium production wastewater, such as biological method, breakpoint chlorination method, chemical precipitation method, etc. However, these methods have problems such as high operating cost, difficulty in subsequent treatment, and secondary pollution. Therefore, it is necessary to find a short process method with simple process, convenient operation and low cost to reduce the ammonia nitrogen content in platinum and palladium production wastewater. Summary of the invention

[0004] The present invention discloses a method for reducing the ammonia nitrogen content of platinum-palladium production wastewater in a short process, so as to solve any of the above and other potential problems in the prior art.

[0005] The object of the present invention is to provide a method for reducing the ammonia nitrogen content of platinum-palladium production wastewater in a short process, which specifically comprises the following steps:

[0006] S1: Pumping platinum and palladium production wastewater into the advanced oxidation reaction tank;

[0007] S2: The water inlet of the ultrafine bubble generator is connected to the circulation pump, the water outlet of the ultrafine bubble generator is opened in the waste liquid of the advanced oxidation reaction tank, and the air inlet of the ultrafine bubble generator is connected to the atmosphere; the two ends of the circulation pump are connected to the water inlet of the ultrafine bubble generator and the waste liquid of the advanced oxidation reaction tank respectively;

[0008] S3: Turn on the circulation pump, the waste liquid is pumped from the advanced oxidation reaction tank into the ultrafine bubble generator, air is sucked into the ultrafine bubble generator to form ultrafine bubble water with the pumped waste liquid, and the ultrafine bubble water enters the advanced oxidation reaction tank from the outlet of the ultrafine bubble generator;

[0009] S4: Ultrafine bubbles generate hydroxyl radicals in the waste liquid, deeply oxidizing the ammonia nitrogen compounds in the waste liquid into nitrogen and water, and the nitrogen directly overflows from the solution;

[0010] S5: After reacting for a certain period of time at a certain temperature, the content of ammonia nitrogen compounds in platinum-palladium wastewater can be greatly reduced.

[0011] Preferably, the ammonia nitrogen compound pollutants in S4 are mainly one or more of nitrogen-containing organic matter, ammonia water and ammonium ions.

[0012] Preferably, the reaction temperature in S5 is 20-60° C., and the reaction time is 96-168 h.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The above technical solution can significantly reduce the content of ammonia nitrogen compounds in platinum-palladium wastewater, shorten the process flow, and save production costs;

[0015] 2. Through the introduction of ultra-fine bubbles, a large number of hydroxyl free radicals are generated, which oxidize the ammonia nitrogen compounds in the platinum-palladium wastewater into nitrogen and water, without generating new waste, thus completely solving the problem of secondary pollution;

[0016] 3. The operation method is simple, the process is simple and reliable, no reagents need to be added, it is easy to industrialize and automate, and has significant economic and social benefits. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Example 1

[0019] Take 100L of platinum-palladium production wastewater, analyze the ammonia nitrogen content and find it is 18440mg / L, connect the inlet of ultrafine bubble generator with the circulation pump, open the outlet of generator in the waste liquid, and connect the air inlet of ultrafine bubble generator with the atmosphere; turn on the circulation pump, the waste liquid is pumped into the ultrafine bubble generator from the advanced oxidation reaction tank, the air is sucked into the ultrafine bubble generator to form ultrafine bubbles, and the ultrafine bubbles enter the advanced oxidation reaction tank from the outlet of ultrafine bubble generator, the reaction temperature is 20℃, and the reaction time is 168h.

[0020] After adopting the method of the present invention for reducing the ammonia nitrogen content in platinum-palladium production wastewater, the ammonia nitrogen content is 7860 mg / L, and the removal rate is 57.37%.

[0021] Example 2

[0022] 100L of platinum-palladium production wastewater was taken, and the ammonia nitrogen content was analyzed to be 22368mg / L. The inlet of the ultrafine bubble generator was connected to the circulation pump, and the outlet of the generator was opened in the waste liquid, and the air inlet of the ultrafine bubble generator was connected to the atmosphere; the circulation pump was turned on, and the waste liquid was pumped into the ultrafine bubble generator from the advanced oxidation reaction tank, and the air was sucked into the ultrafine bubble generator to form ultrafine bubbles, and the ultrafine bubbles entered the advanced oxidation reaction tank from the outlet of the ultrafine bubble generator. The reaction temperature was 40°C and the reaction time was 132h.

[0023] After adopting the method of the present invention for reducing the ammonia nitrogen content in platinum-palladium production wastewater, the ammonia nitrogen content is 8752 mg / L, and the removal rate is 60.87%.

[0024] Example 3

[0025] Take 100L of platinum and palladium production wastewater, and analyze the ammonia nitrogen content therein to be 19650mg / L. Connect the inlet of the ultrafine bubble generator to the circulation pump, and the outlet of the generator is open in the waste liquid, and the air inlet of the ultrafine bubble generator is connected to the atmosphere; turn on the circulation pump, and the waste liquid is pumped into the ultrafine bubble generator from the advanced oxidation reaction tank, and the air is sucked into the ultrafine bubble generator to form ultrafine bubbles. The ultrafine bubbles enter the advanced oxidation reaction tank from the outlet of the ultrafine bubble generator. The reaction temperature is 60°C and the reaction time is 96h.

[0026] After adopting the method of the present invention for reducing the ammonia nitrogen content in platinum-palladium production wastewater, the ammonia nitrogen content is 7600 mg / L, and the removal rate is 61.32%.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for reducing the ammonia nitrogen content of platinum and palladium production wastewater by a short process, characterized in that: The specific steps include: S1: Pumping platinum and palladium production wastewater into the advanced oxidation reaction tank; S2: The water inlet of the ultrafine bubble generator is connected to the circulation pump, the water outlet of the ultrafine bubble generator is opened in the waste liquid of the advanced oxidation reaction tank, and the air inlet of the ultrafine bubble generator is connected to the atmosphere; the two ends of the circulation pump are connected to the water inlet of the ultrafine bubble generator and the waste liquid of the advanced oxidation reaction tank respectively; S3: Turn on the circulation pump, the waste liquid is pumped from the advanced oxidation reaction tank into the ultrafine bubble generator, air is sucked into the ultrafine bubble generator to form ultrafine bubble water with the pumped waste liquid, and the ultrafine bubble water enters the advanced oxidation reaction tank from the outlet of the ultrafine bubble generator; S4: Ultrafine bubbles generate hydroxyl radicals in the waste liquid, deeply oxidizing the ammonia nitrogen compounds in the waste liquid into nitrogen and water, and the nitrogen directly overflows from the solution; S5: After reacting for a certain period of time at a certain temperature, the content of ammonia nitrogen compounds in platinum-palladium wastewater can be greatly reduced.

2. A method for reducing ammonia nitrogen content in platinum and palladium production wastewater by a short process according to claim 1, characterized in that: The ammonia nitrogen compound pollutants in S4 are mainly one or more of nitrogen-containing organic matter, ammonia water and ammonium ions.

3. A method for reducing ammonia nitrogen content in platinum and palladium production wastewater by a short process according to claim 1, characterized in that: The reaction temperature in S5 is 20-60° C., and the reaction time is 96-168 h.