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A treatment process for high ammonia nitrogen and high heavy metal wastewater

A treatment process, high ammonia nitrogen high technology, applied in water/sewage treatment, special compound water treatment, light water/sewage treatment, etc., can solve the problems of poor biodegradability of aged leachate, heavy metal removal effect and ammonia nitrogen removal effect. , to achieve the effect of increasing the contact area, increasing the mass transfer area, and improving the reaction efficiency

Active Publication Date: 2020-08-28
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

5) The concentrations of COD and BOD are both very high, COD is as high as tens of thousands, and BOD is also several thousand, but with the extension of landfill time, the BOD / COD value is even lower than 0.1, indicating the stable period and the biodegradability of old leachate poor
This method has a poor effect on the removal of heavy metals and ammonia nitrogen in landfill leachate, and is not suitable for the treatment of a large amount of landfill leachate.

Method used

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  • A treatment process for high ammonia nitrogen and high heavy metal wastewater
  • A treatment process for high ammonia nitrogen and high heavy metal wastewater
  • A treatment process for high ammonia nitrogen and high heavy metal wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1 landfill leachate removes heavy metal, phosphorus, fluorine

[0037] In the landfill leachate treated in this embodiment, the total metal content is 20 mg / L, the total chromium content is 5 mg / L, the arsenic content is 4.5 mg / L, and the total phosphorus content is 7 mg / L.

[0038] The MOF catalyst used in this example is Fe-MIL-101, and the preparation process is as follows:

[0039] a) In the reactor, add 0.675g (ie 2.45mmol) FeCl 3. 6H 2 O and 206mg (ie 1.24mmol) terephthalic acid and 15mL N, N-dimethylformamide, and then the reaction kettle was stirred in a magnetic stirrer for 30min.

[0040] b) The reaction kettle is placed in a constant temperature 110° C. drying oven for 24 hours.

[0041] c) After the above reaction, cool to room temperature, filter with vacuum pump, and wash repeatedly with N,N-dimethylformamide.

[0042] d) Purify the sample obtained above with absolute ethanol at 60° C. for 3 h.

[0043] e) After the purification is complete...

Embodiment 2

[0047] Example 2 Landfill Leachate Removal of Heavy Metals, Phosphorus, Fluorine

[0048] In the landfill leachate treated in this embodiment, the total metal content is 22 mg / L, the total chromium content is 5.3 mg / L, the arsenic content is 4.4 mg / L, and the total phosphorus content is 6.85 mg / L.

[0049] The MOF catalyst used in this embodiment is Fe / MIL-125(Ti), and the preparation process is as follows:

[0050] a) Add 3.61gH in a 200mL double-necked bottle 2 BDC, then add 48mL N,N-dimethylformamide (DMF), and stir at 110°C under reflux for 2h;

[0051] b) Slowly add 16mL of methanol at intervals with a glass rod under stirring, and then install a reflux condenser to continue reflux at 110°C for 1h;

[0052] c) Add 5.6mL of isopropyl titanate, lower the temperature to 100°C, and continue to reflux for 3 days;

[0053] d) Suction filtration after natural cooling, washing with N,N-dimethylformamide (DMF), and drying the solid;

[0054] e) Add excess N,N-dimethylformamide...

Embodiment 3

[0059] Embodiment 3 Landfill leachate removes ammonia nitrogen

[0060] Get the 20L landfill leachate that embodiment 1 obtains, wherein the ammonia nitrogen content is 300mg / L, landfill leachate is passed in the photocatalytic reactor, is provided with the leaf, stem, bark of photosensitive plant in the photocatalytic reactor It is a porous molecular sieve TiO2 catalyst coating synthesized as a template. The reactor is equipped with an ultraviolet light source, and high-pressure air is introduced into the reactor. The landfill leachate forms atomized droplets in the reactor and reacts up and down. The reaction is completed after 2 hours. , the ammonia nitrogen content of the treated landfill leachate is 25mg / L.

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Abstract

The invention discloses a process for treating waste water with high ammonia nitrogen and high heavy metal. The process is characterized in that heavy metal is adsorbed and removed by adopting an MOFs (metal organic frameworks) catalyst after the waste water with high ammonia nitrogen and high heavy metal is pretreated, the waste water subjected to adsorption treatment is subjected to light-catalyzed reaction to remove ammonia nitrogen, and light-catalyzed reaction is conducted to remove COD; and when the ammonia nitrogen is removed by the light-catalyzed reaction, the waste water is atomized in a reactor to form cross flows for reaction, atomized cross flows are formed, the utilization rate of the light source is increased, and the reaction contact area is increased. The heavy metal, the ammonia nitrogen and the COD in the waste water can be effectively removed, the process is simple, the treatment efficiency is high, and the treated waste water can reach the related discharge standard.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment process for high ammonia nitrogen and high heavy metal waste water. Background technique [0002] Wastewater with high heavy metals, high ammonia nitrogen and high COD mainly comes from the chemical industry, garbage and hydrometallurgy industries. If it is discharged without effective treatment, it will cause great pollution to the environment. At present, the treatment of high concentration ammonia nitrogen and high concentration heavy metal wastewater is a major issue. difficulty. [0003] Landfill leachate is a typical waste water with high heavy metals, high ammonia nitrogen, and high COD. The leachate contains low-molecular-weight fatty acids, humic-like high-molecular carbohydrates, and medium-molecular-weight fulvic acids. Although the concentration of a particular pollutant in the leachate is low, the total amount is huge due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/32C02F1/28C02F103/06C02F101/16
CPCC02F1/285C02F1/32C02F2101/16C02F2103/06C02F2305/10
Inventor 王家强王伟李斌
Owner YUNNAN UNIV