CN113072122A

CN113072122A - Treatment scheme and device for ammonia nitrogen adsorption of acid modified fly ash

Info

Publication number: CN113072122A
Application number: CN202110280089.1A
Authority: CN
Inventors: 刘小真; 杨子依
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-07-06

Abstract

The invention relates to the field of acid modified adsorption, in particular to a treatment scheme and a device for adsorbing ammonia nitrogen by using acid modified fly ash. The invention adopts a plurality of processes of acid washing, water washing, drying and the like for treatment, so that the acid modified fly ash can completely adsorb ammonia nitrogen, and part of free hydrogen ions in the modification process are removed to be attached to the fly ash, thereby being beneficial to the adsorption effect of the fly ash on the ammonia nitrogen, and the whole process is integrally treated in the device.

Description

Treatment scheme and device for ammonia nitrogen adsorption of acid modified fly ash

Technical Field

The invention relates to the field of acid modified adsorption, in particular to a treatment scheme and a device for adsorbing ammonia nitrogen by using acid modified fly ash.

Background

When rare earth is extracted by a rare earth-containing company, a large amount of ammonia nitrogen-containing wastewater and ammonia nitrogen wastewater with high concentration can be generated, if a membrane biological method and the like are adopted, the cost is higher, new pollution can be generated, the subsequent treatment is complicated, the ammonia nitrogen wastewater is discharged into rivers and lakes, the eutrophication of lakes can be caused, aquatic plants and fishes in the water body can die, and the water body in the lakes is stink. If the wastewater containing ammonia nitrogen is eaten by people by mistake, the wastewater seriously harms the health of the people and can cause the death of the people if the wastewater is serious.

Disclosure of Invention

The invention aims to provide a novel adsorption and adsorption treatment scheme and equipment, after acid modification, the fly ash is subjected to washing for different times in different time periods, and after different washing times, the fly ash contains acidity which is continuously desalted, and the washing times are different, so that hydrogen ions on the surface of the fly ash are removed to the maximum extent after the fly ash is subjected to acid washing, and the water of the used fly ash is minimized, so that the economic cost is saved.

In order to achieve the purpose, the invention provides a treatment method for adsorbing ammonia nitrogen by using acid modified fly ash, which comprises the steps of soaking fly ash and nitric acid according to a ratio, standing for 24 hours, then pouring the soaked waste liquid into a waste liquid cylinder, and adding the soaked fly ash into a waste liquid cylinder with a solid-liquid ratio of 1: 5, washing with water, soaking for 24 hours, detecting the pH value, and adding a mixture of water with a solid-liquid ratio of 1: and 5, washing the fly ash with water, soaking for 8 hours, removing the washing liquid, measuring the pH value, repeating the steps until the pH value is not changed, drying the remaining fly ash, and adsorbing the treated fly ash.

Preferably, the nitric acid is concentrated nitric acid, and is diluted to prepare a nitric acid solution with the concentration of 2 mol/L.

Preferably, the solid-liquid ratio of the fly ash to the acid is 1: 5.

preferably, the device comprises a plastic funnel, a glass cylinder container with a notch at the top, a square container with a tube opening, a square iron container with a tube, a suction filter pump, an iron square container, a plastic rectangular container, a quartz sand-stainless steel movable plate, the plastic funnel is embedded on a glass cylinder container with a notch at the top by adopting a screw device at the bottom, the top of the container is provided with a notch glass cylinder container which is transversely arranged, a quartz sand-stainless steel movable plate is embedded below the container, quartz sand-stainless steel fly leaf sub-unit connection iron cube container, half embedding plastics cuboid container on the left of the iron cube container, the uncovered cube container of upper right end open connection area pipe, the bottom is with the heating tape, and the open connection area pipe cube container of making in the right side below, take to connect the suction filtration pump on the square iron container pipeline of pipe.

Compared with the prior art, the invention has the beneficial effects that:

(1) under the condition of acid modification of the fly ash, the surface structure of the fly ash is not smooth any more, a plurality of folds are formed on the surface, and the specific surface area is increased, so that more adsorption sites are increased, the adsorption capacity is increased, the fly ash after being washed by water has no influence of hydrogen ions, the phenomenon of inhibiting the adsorption of ammonia nitrogen is avoided, and the accurate control of the adsorption time is not needed;

(2) the acid collecting tank is a movable plate, so that waste water and waste acid can be conveniently collected;

(3) the equipment adopted by the invention can modify and adsorb the fly ash and carry out integrated treatment on the equipment.

Drawings

FIG. 1 is a schematic view of the apparatus of the present invention.

In the figure: 1. a plastic funnel; 2. a glass cylinder container with a notch at the top; 3. an open square container with a pipe; 4. a square iron container with a tube; 5. a suction filtration pump; 6. an iron cube container; 7. a plastic rectangular parallelepiped container; 8. quartz sand-stainless steel movable plate.

Detailed Description

The present invention will be further described with reference to examples.

Example 1

The method comprises the steps of pouring fly ash from a plastic funnel 1, pouring acid into a glass cylinder container 2 with a notch at the top in sequence, enabling the fly ash to be in full contact with the acid in the glass cylinder container 2 with the notch at the top, enabling a quartz sand-stainless steel movable plate 8 to have a timing effect, opening a small opening after 24 hours, introducing waste acid into a plastic cuboid container 7, pouring water into the plastic funnel 1 for continuous water washing after the acid is poured out, and enabling water washing wastewater to flow into the plastic cuboid container 7. After washing, quartz sand-stainless steel fly leaf 8 is opened completely and fly ash is poured into iron cube container 6, there is heating system in iron cube container 6 department bottom, quartz sand-stainless steel fly leaf 8 will be opened and get rid of fly ash steam when heating, ammonia nitrogen waste water is poured into in the square container 3 department that will take the pipe uncovered, adsorb and handle in flowing into iron cube container 6, after adsorbing, open suction filtration pump 5, take out water to take pipe cube iron container 4 and go out water, take out plastics cuboid container 7 jar after adsorbing, take out fly ash.

Example 2

And (3) modifying the fly ash by 20-30g more than the required amount of the fly ash. Diluted by concentrated nitric acid to prepare a nitric acid solution of 2 mol/L. A container with a higher outer wall is adopted, and the solid-liquid ratio is 1: 5, and a standing was performed while the fly ash was also poured therein. After 24 hours, pouring the soaking solution into a waste liquid tank, and adding a mixture of 1: 5, washing with water, soaking in water for 24 hours, detecting the pH value, and adding a mixture of water with a solid-to-liquid ratio of 1: and 5, washing the fly ash with water, soaking for 8 hours, removing the washing liquid to measure the pH, repeating the steps, and finishing the experiment generally for 3 times when the pH of the washing liquid is not changed.

Claims

1. The treatment method for adsorbing ammonia nitrogen by using acid modified fly ash is characterized by comprising the following steps: soaking fly ash and nitric acid according to a ratio, standing for 24h, then pouring the soaked waste liquid into a waste liquid cylinder, and adding the soaked fly ash into a waste liquid cylinder with a solid-to-liquid ratio of 1: 5, soaking for 24 hours, removing the water and the washing liquid, measuring the pH value, and then adding a mixture of water, water and the washing liquid in a solid-to-liquid ratio of 1: and 5, washing the fly ash with water, soaking for 8 hours, removing the washing liquid, measuring the pH value, repeating the steps until the pH value is not changed, drying the remaining fly ash, and adsorbing the treated fly ash.

2. The method of claim 1, further comprising: the nitric acid is diluted by concentrated nitric acid to prepare a nitric acid solution with the concentration of 2 mol/L.

3. The method of claim 1, further comprising: the solid-liquid ratio of the fly ash to the acid is 1: 5.

4. an apparatus for use in the method of claim 1, wherein: the device comprises a plastic funnel (1), wherein the top is provided with a notch glass cylinder container (2), an open square container (3) with a tube is provided with a square iron container (4), a suction filter pump (5), an iron square container (6), a plastic cuboid container (7) and a quartz sand-stainless steel movable plate (8), the plastic funnel (1) adopts the bottom to be inlaid on the notch glass cylinder container (2) at the top for a screw device, the notch glass cylinder container (2) is transversely arranged at the top, the quartz sand-stainless steel movable plate (8) is embedded below, the lower part of the quartz sand-stainless steel movable plate (8) is connected with the iron square container (6), the left side of the iron square container (6) is half embedded into the plastic cuboid container (7), and the upper right end is connected with the open square container (3), the bottom part is attached with the heating band, and the opening of right side below is connected with square iron container (4) of union coupling, connect suction filtration pump (5) on square iron container (4) pipeline of union coupling.