Method for removing COD (Chemical Oxygen Demand) and recycling high-ammonia-nitrogen high-salt organic wastewater

A technology of organic wastewater and high ammonia nitrogen, which is applied in chemical instruments and methods, water pollutants, process efficiency improvement and other directions, can solve the problems of reducing the COD removal efficiency of organic wastewater, polluting the air, and high treatment costs, and achieves simple and convenient treatment steps. , The effect of low processing cost and less slag production

Pending Publication Date: 2022-08-05
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Description
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Problems solved by technology

However, the existing methods for high-ammonia-nitrogen and high-salt organic wastewater have great limitations, such as the coagulation-sedimentation method has a low removal rate of dissolved substances, low reuse rate of activated carbon and high cost; the traditional Fenton method is too expensive to treat , a large amount of iron-containing sludge will be produced during the degradation of organic matter, causing secondary pollution. At the same time, due to the presence of a large amount of ammonium sulfate in the solution, a large amount of ammonia gas will also be generated in the Fento

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  • Method for removing COD (Chemical Oxygen Demand) and recycling high-ammonia-nitrogen high-salt organic wastewater

Examples

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Embodiment 1

[0038]First, take 1.0L of refractory organic wastewater with high ammonia nitrogen and high salt produced in the process of nickel-cobalt wet smelting. The ammonia nitrogen concentration in the wastewater is 5g / L. The main salts in the wastewater (concentration 37.59%) include ammonium sulfate, sodium sulfate, chloride Sodium, ammonium chloride, TDS of wastewater is 39.63%, organic matter includes P204, P204 ammonia soap, P204 sodium soap, sulfonated kerosene, etc. TOC concentration is 12560.75mg / L, COD concentration is 11778.9mg / L. Put the waste water into a round-bottomed flask, add a stirrer, and heat it properly. Control the temperature of the waste water to 70°C. According to the characteristics of the waste water, add an appropriate amount of NaOH with a mass fraction of 60% into the solution until no ammonia gas is produced in the solution. , using sulfuric acid with a concentration of 98% to absorb ammonia gas, and the purity of the obtained ammonium salt solution is ab...

Embodiment 2

[0040] First, take 1.0L of refractory organic wastewater with high ammonia nitrogen and high salt produced in the process of nickel-cobalt hydrometallurgy. The ammonia nitrogen concentration in the wastewater is 14.7g / L. Magnesium chloride, ammonium chloride, waste water TDS 27.93%, organics include P507, P507 ammonia soap, P507 sodium soap, sulfonated kerosene, etc. TOC concentration is 1914.27mg / L, COD concentration is 5832mg / L. Put the waste water into a round-bottomed flask, add a stirrer, and heat it properly. Control the temperature of the waste water to 70°C. According to the characteristics of the waste water, add an appropriate amount of NaOH with a mass fraction of 60% into the solution until no ammonia gas is produced in the solution. , using sulfuric acid with a concentration of 85% to absorb ammonia gas, and the purity of the obtained ammonium salt solution is about 90%. When the temperature of the waste water is lowered from 70° C. to room temperature, sodium sul...

Embodiment 3

[0042] First, take 1.0L of refractory organic wastewater with high ammonia nitrogen and high salt produced in the nickel-cobalt wet smelting process. The ammonia nitrogen concentration in the wastewater is 14.67g / L. Magnesium chloride, ammonium chloride, nickel sulfate, nickel chloride, etc., waste water TDS 19.79%, organics include P507, P507 ammonia soap, P507 sodium soap, sulfonated kerosene, etc. TOC concentration is 1277.31mg / L, COD concentration is 28732mg / L . Put the waste water into a round-bottomed flask, add a stirrer, and heat it properly. Control the temperature of the waste water to be 70 °C. According to the characteristics of the waste water, add an appropriate amount of NaOH with a mass fraction of 80% into the solution until no ammonia is produced in the solution. , using sulfuric acid with a concentration of 90% to absorb ammonia gas, and the purity of the obtained ammonium salt solution is about 80%. When the temperature of the waste water is lowered from 7...

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Abstract

The invention provides a method for removing COD (Chemical Oxygen Demand) from high-ammonia-nitrogen high-salt organic wastewater, which comprises the following steps: (1) adding alkali into high-ammonia-nitrogen wastewater for deamination to obtain deaminated liquid; (2) standing the deaminated liquid to separate out sodium sulfate crystal salt, and performing solid-liquid separation to obtain crystallized liquid; (3) adjusting the pH value of the crystallized liquid, and aerating; (4) performing electrocatalytic oxidation on the solution obtained in the step (3); (5) further performing Fenton reaction on the solution obtained in the step (4); (6) adding alkali liquor to adjust the solution obtained in the step (5) to be alkaline; and (7) adding a flocculating agent into the solution obtained in the step (6), and carrying out solid-liquid separation to obtain a COD-removed solution. According to the method, COD in the high-ammonia-nitrogen high-salt organic wastewater can be efficiently removed, meanwhile, ammonium salt and sodium sulfate can be recycled, the treatment cost is low, the slag amount is small, and the treatment steps are simple and convenient.

Description

technical field [0001] The invention relates to the field of wastewater treatment in the new energy industry, in particular to a method for removing COD and recycling organic wastewater with high ammonia nitrogen and high salt. Background technique [0002] In the process of nickel, cobalt, manganese smelting and nickel-cobalt-manganese recovery of waste batteries, P507 or P204 are commonly used for nickel-cobalt enrichment and purification. The extraction method can realize the enrichment and purification of nickel, cobalt and manganese. Generally, the extractant (mainly phosphate ester extractant, such as P507, P204) is diluted with a solvent such as sulfonated kerosene before extraction, and then ammonia water is used. Or saponification such as liquid caustic soda, saponification of the organic phase for extraction. After the extraction reaction finishes, through mechanical clarification, phase separation obtains raffinate (water phase) and extraction phase (cobalt-rich ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/12C02F101/16C02F101/30C02F101/34C02F101/38
CPCC02F9/00C02F1/66C02F1/4672C02F1/46104C02F1/722C02F1/725C02F1/5245C02F2101/101C02F2101/12C02F2101/16C02F2101/34C02F2101/38C02F2101/30C02F2305/026Y02W30/84
Inventor 赵次娴雷吟春蒋国民戴镇璇王凯廖圆刘永丰闫虎祥孟云曾丽娟赵淑宏金利平
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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