CN114602305B - Aluminum oxidation waste gas and wastewater treatment system and application method thereof - Google Patents

Abstract

The invention relates to the technical field of aluminum oxidation sewage treatment processes, in particular to an aluminum oxidation waste gas and wastewater treatment system and a using method thereof. An aluminum oxidation waste gas and wastewater treatment system comprises a waste gas treatment flow channel, a wastewater treatment flow channel and a post-treatment flow channel, wherein an outlet of the waste gas treatment flow channel is communicated with an inlet of the wastewater treatment flow channel, and an outlet of the wastewater treatment flow channel is communicated with an inlet of the post-treatment flow channel. The hydrogen sulfide gas generation reducing device has the effects of reducing the generation of hydrogen sulfide gas and improving the working safety of workers.

Description

Aluminum oxidation waste gas and wastewater treatment system and application method thereof

Technical Field

The invention relates to the technical field of aluminum oxidation sewage treatment processes, in particular to an aluminum oxidation waste gas and wastewater treatment system and a using method thereof.

Background

With the development of the aluminum industry, the surface treatment of aluminum has become an essential and important link in the aluminum processing process. However, the surface treatment of aluminum itself generates a large amount of acidic high-concentration aluminum oxidation waste water and aluminum oxidation waste gas, and if the aluminum oxidation waste gas and the waste water are discharged without being treated, the aluminum oxidation waste gas and the waste water will cause environmental pollution.

In the related art, workers usually add strong alkaline agent solution such as sodium hydroxide or sodium sulfide to treat the aluminum oxidation wastewater and exhaust gas. However, the applicant finds that when the sodium sulfide solution is used for treating the aluminum oxide waste gas, once the chimney waste water generated by treatment contacts with the aluminum oxide waste water, a large amount of highly toxic gas hydrogen sulfide is formed in the chimney waste water, thereby causing threat to the personal safety of workers.

Disclosure of Invention

In order to reduce the generation of hydrogen sulfide gas, the application provides an aluminum oxidation waste gas and wastewater treatment system and a use method thereof.

In a first aspect, the application provides an aluminum oxidation waste gas and wastewater treatment system, which adopts the following technical scheme:

an aluminum oxidation waste gas and wastewater treatment system comprises a waste gas treatment flow channel, a wastewater treatment flow channel and a post-treatment flow channel, wherein an outlet of the waste gas treatment flow channel is communicated with an inlet of the wastewater treatment flow channel, and an outlet of the wastewater treatment flow channel is communicated with an inlet of the post-treatment flow channel;

the waste water treatment runner includes the chimney wastewater disposal basin and the comprehensive wastewater disposal basin of intercommunication each other, the export of exhaust-gas treatment runner with the chimney wastewater disposal basin communicates each other, the entry of synthesizing the wastewater disposal basin with the export of chimney wastewater disposal basin communicates each other, synthesize the wastewater disposal basin and be used for turning into aluminium oxidation waste water basicity, synthesize the wastewater disposal basin and be used for mixing chimney waste water and alkaline aluminium oxidation waste water and deposit the pollutant.

When the aluminum oxide waste gas and waste water are required to be treated, workers can firstly treat the waste gas in the waste gas treatment flow channel through a sodium sulfide solution, so that the chimney waste water is obtained and stored in the chimney waste water pool. And then, workers can convert the aluminum oxidation wastewater into alkalinity in the comprehensive wastewater pool through sodium hydroxide and calcium hydroxide, and then can mix the alkaline aluminum oxidation wastewater and the chimney wastewater.

By adopting the technical scheme, the generation of hydrogen sulfide gas is effectively reduced, meanwhile, the treatment of the chimney waste water and the aluminum oxidation waste water is not required to be carried out independently, and the treatment efficiency of the aluminum oxidation waste gas and the aluminum oxidation waste water is effectively improved.

Optionally, the post-treatment flow channel comprises a total nitrogen treatment tank and a sedimentation tank, an outlet of the comprehensive wastewater tank is communicated with an inlet of the total nitrogen treatment tank, and a filter screen is arranged in the outlet of the comprehensive wastewater tank; and the outlet of the total nitrogen treatment tank is communicated with the inlet of the sedimentation tank.

Because the filter screen is arranged in the outlet of the comprehensive wastewater pool, the filter screen can block the sediment after the chimney wastewater and the aluminum oxidation wastewater are treated, thereby reducing the secondary pollution of the sediment to the water body.

In addition, nitrogen is an important pollution factor in water environment, if the content of nitrogen in sewage is relatively high, when the sewage is discharged, water body is eutrophicated, so that algae or aquatic plants in the water body explode greatly, the oxygen content in the water is reduced, organisms in the water die due to oxygen deficiency, and water body pollution is further aggravated. In the present application, however, the total nitrogen treatment is first performed in the post-treatment, thereby reducing the nitrogen content in the stack waste water and the aluminum oxidation waste water.

Optionally, the waste gas treatment flow channel comprises a first waste gas tower, a second waste gas tower and a third waste gas tower which are connected in sequence, and an outlet of the third waste gas tower is communicated with an inlet of the chimney wastewater pool; the first waste gas tower is provided with a first waste gas pipe and is used for storing and stirring sodium sulfide solution; the second waste gas tower is provided with a second waste gas pipe and is used for storing and stirring the primary treatment chimney wastewater flowing out of the first waste gas tower; and a third waste gas pipe is arranged on the third waste gas tower, and the third waste gas tower is used for storing and stirring secondary treatment chimney wastewater flowing out of the second waste gas tower.

When the aluminum oxide waste gas needs to be treated, a worker can firstly fill a sodium sulfide solution into the first waste gas tower, then fill the aluminum oxide waste gas into the first waste gas tower for mixing reaction, and obtain primary chimney waste water when the pH value of a mixed solution in the first waste gas tower is 12-13;

transferring the primary chimney waste water into a second waste gas tower, then filling new aluminum oxidation waste gas into the second waste gas tower and carrying out mixed reaction with the primary chimney waste water, and obtaining secondary chimney waste water when the pH value of a mixed solution in the second waste gas tower is 11-12;

and transferring the secondary chimney waste water into a third waste gas tower, then filling new aluminum oxidation waste gas into the third waste gas tower, carrying out mixed reaction with the secondary chimney waste water, and obtaining the tertiary chimney waste water when the pH value of a mixed solution in the third waste gas tower is 9-11.

By adopting the technical scheme, the sodium sulfide solution can react completely as much as possible, so that the using amount of the sodium sulfide solution can be saved while the generation amount of the waste water of the tertiary chimney is reduced. In addition, due to the arrangement of the first waste gas tower, the second waste gas tower and the third waste gas tower, workers can select different waste gas towers according to the amount of waste gas generated in the aluminum oxidation process, and the possibility that the sodium sulfide solution reacts to obtain hydrogen sulfide gas due to the fact that the amount of the aluminum oxidation waste gas is too large is effectively reduced.

Optionally, the gas outlet of the first waste gas pipe is communicated with the bottom of the first waste gas tower, the gas outlet of the second waste gas pipe is communicated with the bottom of the second waste gas tower, and the gas outlet of the third waste gas pipe is communicated with the bottom of the third waste gas tower.

By adopting the technical scheme, the gas outlet of the first waste gas pipe is arranged at the bottom of the first waste gas tower, the gas outlet of the second waste gas pipe is arranged at the bottom of the second waste gas tower, and the gas outlet of the third waste gas pipe is arranged at the bottom of the third waste gas tower, so that in the process of filling aluminum oxide waste gas, the waste gas can fully react with a sodium sulfide solution, and the treatment efficiency of the aluminum oxide waste gas is effectively improved.

In addition, in the process of filling the aluminum oxidation waste gas, the aluminum oxidation waste gas can also carry out gas explosion stirring on the sodium sulfide solution, so that the aluminum oxidation waste gas is further promoted to react with the sodium sulfide solution, and the treatment efficiency of the aluminum oxidation waste gas is further improved.

Optionally, the air inlet of the first waste gas pipe is higher than the highest height of the first waste gas tower, the air inlet of the second waste gas pipe is higher than the highest height of the second waste gas tower, and the air inlet of the third waste gas pipe is higher than the highest height of the third waste gas tower.

By adopting the technical scheme, the air inlet of the first waste gas pipe is higher than the height of the first waste gas tower, the air inlet of the second waste gas pipe is higher than the height of the second waste gas tower, and the air inlet of the third waste gas pipe is higher than the height of the third waste gas pipe, so that after the aluminum oxide waste gas is filled, the sodium sulfide solution is not easy to overflow from the first waste gas pipe, the second waste gas pipe and the third waste gas pipe due to the height difference, and the safety of the aluminum oxide waste gas treatment is indirectly improved.

Optionally, a plurality of first exhaust branch pipes are arranged at the air outlets of the first exhaust pipes, and the air outlets of the plurality of first exhaust branch pipes face different directions; a plurality of second waste gas branch pipes are arranged at gas outlets of the second waste gas pipes, and the gas outlets of the plurality of second waste gas branch pipes face different directions; and a plurality of third waste gas branch pipes are arranged at the gas outlet of the third waste gas pipe, and the gas outlets of the plurality of third waste gas branch pipes face to different directions.

By adopting the technical scheme, the air outlets of the first waste gas branch pipes face to different directions, the air outlets of the second waste gas branch pipes face to different directions, and the air outlets of the third waste gas branch pipes face to different directions, so when the aluminum oxidized waste gas is filled into the sodium sulfide solution, the aluminum oxidized waste gas can be subjected to gas explosion stirring in different directions of the sodium sulfide solution, and the treatment efficiency of the aluminum oxidized waste gas is further improved.

Optionally, the second waste gas tower is located below the first waste gas tower, the third waste gas tower is located below the second waste gas tower, and the first waste gas tower, the second waste gas tower and the third waste gas tower are communicated with each other.

Through adopting above-mentioned technical scheme, because the second waste gas tower is located the below of first waste gas tower, the third waste gas tower is located the below of second waste gas tower to when needing to shift the sodium sulfide solution in the first waste gas tower to the second waste gas tower, the sodium sulfide solution can be automatic shift under the action of gravity. In a similar way, the operation of transferring the sodium sulfide solution in the second waste gas tower to the third waste gas tower can be automatically carried out, so that a water suction pump is omitted, and the cost is reduced.

Optionally, a first spiral channel is arranged in the first waste gas tower, an inlet of the first waste gas tower is communicated with an inlet of the first spiral channel, and an outlet of the first spiral channel faces the bottom of the first waste gas tower;

a second spiral channel is arranged in the second waste gas tower, an outlet of the first waste gas tower is communicated with an inlet of the second spiral channel, and an outlet of the second spiral channel faces to the bottom of the second waste gas tower;

and a third spiral channel is arranged in the third waste gas tower, an outlet of the second waste gas tower is communicated with an inlet of the third spiral channel, and an outlet of the third spiral channel faces to the bottom of the third waste gas tower.

Through adopting above-mentioned technical scheme, because first helical passage's setting, so adding the in-process to first waste gas tower with sodium sulfide solution, first helical passage can stir sodium sulfide solution under the effect of centrifugal force to improve the degree of consistency of sodium sulfide solution, improve the treatment effeciency of aluminium oxidation waste gas indirectly.

Due to the arrangement of the second spiral channel, when the sodium sulfide solution in the first waste gas tower is transferred into the second waste gas tower, the second spiral channel can stir the sodium sulfide solution, so that the waste gas filled in the first waste gas tower and the sodium sulfide solution are stirred for the second time, and the treatment efficiency of the aluminum oxide waste gas is further improved. The function of the third spiral channel is similar to that of the second spiral channel, and will not be described in detail below.

In a second aspect, the application provides a use method of an aluminum oxidation waste gas and wastewater treatment system, which adopts the following technical scheme:

a use method of an aluminum oxidation waste gas and wastewater treatment system comprises the following steps:

s1, waste gas treatment: firstly, filling a sodium sulfide solution into a first waste gas tower, then filling aluminum oxide waste gas into the first waste gas tower for mixed reaction, and obtaining primary chimney waste water when the pH value of the mixed solution in the first waste gas tower is 12-13;

transferring the primary chimney waste water into a second waste gas tower, then filling new aluminum oxidation waste gas into the second waste gas tower and carrying out mixed reaction with the primary chimney waste water, and obtaining secondary chimney waste water when the pH value of a mixed solution in the second waste gas tower is 11-12;

transferring the secondary chimney waste water into a third waste gas tower, then filling new aluminum oxidation waste gas into the third waste gas tower and carrying out mixed reaction with the secondary chimney waste water, and obtaining tertiary chimney waste water when the pH value of a mixed solution in the third waste gas tower is 9-11;

s2, wastewater treatment: filling the aluminum oxidation wastewater into a wastewater treatment runner, and then adding calcium hydroxide into the wastewater treatment runner, so that the pH value of the aluminum oxidation wastewater is raised to 6-7;

then gradually adding the tertiary chimney wastewater into the wastewater treatment flow channel, mixing the tertiary chimney wastewater with the aluminum oxidation wastewater, and then adding a cod treatment agent to react for 30-40min;

then, adding calcium hydroxide into the wastewater treatment flow channel again to raise the pH value of the aluminum oxidation wastewater to 8-8.5, and finally adding polyacrylamide into the wastewater treatment flow channel to precipitate and stratify the aluminum oxidation wastewater to obtain supernatant and pollutant precipitate;

s3, post-processing: transferring the supernatant into a post-treatment flow channel, then carrying out biochemical reaction and physicochemical reaction on the supernatant, then adding calcium hydroxide into the post-treatment flow channel, and when the pH value of the supernatant is between 8 and 8.5, adding polyacrylamide into the post-treatment flow channel for precipitation to finally obtain the discharge water meeting the discharge standard.

By adopting the technical scheme, due to the arrangement of the S1 waste gas treatment, the S2 waste water treatment and the S3 post-treatment, workers can more effectively treat the aluminum oxidation waste gas and waste water, and the pollution to the environment is effectively reduced.

Optionally, in the S3 post-treatment, the biochemical reaction and the physicochemical reaction are directly treated by a total nitrogen biological agent;

the total nitrogen biological agent consists of a water-soluble PVA hollow sphere, sodium hypochlorite and biological bacteria powder, wherein the sodium hypochlorite is filled in the water-soluble PVA hollow sphere, and the biological bacteria powder is coated outside the water-soluble PVA hollow sphere; the biological bacteria powder is prepared by mixing starch paste, thiobacillus denitrificans and nitrite oxidizing bacteria, wherein the weight ratio of the starch paste to the thiobacillus denitrificans to the nitrite oxidizing bacteria is 1: (2-4): (1-3).

By adopting the technical scheme, due to the arrangement of the total nitrogen biological agent, when the supernatant is subjected to post-treatment, the working personnel do not need to perform two steps of biochemical reaction and physicochemical reaction, so that the time required by the post-treatment is effectively reduced, and the efficiency of the post-treatment is indirectly improved.

Specifically, when the supernatant needs to be subjected to post-treatment, the staff can directly put the total nitrogen biological agent into the supernatant, and at the moment, the total nitrogen biological agent gradually moves downwards under the action of gravity, so that the biological bacteria powder is promoted to perform comprehensive biochemical reaction on the supernatant.

And along with biochemical reaction's going on, the volume of biological fungus powder reduces gradually, and at this moment, water-soluble PVA hollow sphere drives biological fungus powder and sodium hypochlorite and rises gradually under the effect of buoyancy to impel biological fungus powder to carry out the comprehensive biochemical reaction of secondary to the supernatant fluid.

And when the biological fungus powder basically reacts completely, the water-soluble PVA hollow spheres are gradually dissolved, so that the sodium hypochlorite is promoted to move downwards again under the action of gravity, the sodium hypochlorite is promoted to carry out comprehensive physicochemical reaction on the supernatant, and the post-treatment effect on the supernatant is effectively improved.

In addition, when the thiobacillus denitrificans and the nitrite oxidizing bacteria are mixed and used according to the proportion, nitrogen ions in the supernatant can be converted into nitrogen as much as possible, and the nitrogen content in the supernatant is effectively reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. due to the arrangement of the waste gas treatment flow passage and the waste water treatment flow passage, when the aluminum oxidation waste gas and waste water are treated, the generation of hydrogen sulfide gas can be effectively reduced, meanwhile, the chimney waste water and the aluminum oxidation waste water can be treated without being carried out independently, and the treatment efficiency of the aluminum oxidation waste gas and waste water is effectively improved;

2. due to the arrangement of the first waste gas tower, the second waste gas tower and the third waste gas tower, the sodium sulfide solution can react completely as much as possible, so that the generation amount of the waste water of the third chimney is reduced, and the using amount of the sodium sulfide solution can be saved.

3. Due to the arrangement of the first waste gas tower, the second waste gas tower and the third waste gas tower, workers can select different waste gas towers according to the amount of waste gas generated in the aluminum oxidation process, and the possibility that the sodium sulfide solution reacts to obtain hydrogen sulfide gas due to the fact that the amount of the aluminum oxidation waste gas is too large is effectively reduced.

Drawings

FIG. 1 is a schematic configuration diagram of an aluminum oxidation waste gas and wastewater system.

Description of reference numerals: 1. an exhaust gas treatment flow channel; 2. a wastewater treatment runner; 3. post-processing the flow channel; 11. a first off-gas column; 12. a second off-gas column; 13. a third waste gas tower; 21. a chimney wastewater pool; 22. a comprehensive wastewater tank; 31. a total nitrogen treatment tank; 32. a sedimentation tank; 111. a first exhaust gas pipe; 112. a first exhaust branch pipe; 113. a first spiral channel; 121. a second exhaust gas pipe; 122. a second exhaust branch pipe; 123. a second spiral channel; 131. a third waste gas pipe; 132. a third waste gas branch pipe; 133. a third helical channel.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

Example 1

The embodiment of the application discloses an aluminum oxidation waste gas and wastewater system. Referring to fig. 1, the aluminum oxidation waste gas and wastewater system includes a waste gas treatment flow passage 1, a wastewater treatment flow passage 2, and a post-treatment flow passage 3, wherein an outlet of the waste gas treatment flow passage 1 is communicated with an inlet of the wastewater treatment flow passage 2, and an outlet of the wastewater treatment flow passage 2 is communicated with an inlet of the post-treatment flow passage 3.

When the aluminum oxidation waste gas and wastewater need to be treated, workers can treat the aluminum oxidation waste gas in the waste gas treatment flow channel 1 to obtain the chimney wastewater. Meanwhile, the worker may lower the pH of the aluminum oxidation wastewater in the wastewater treatment channel 2, and then may mix the chimney wastewater and the alkalified aluminum oxidation wastewater.

And then, the working personnel can precipitate and stratify the chimney waste water and the alkalized aluminum oxidation waste water, and then the supernatant is filled into the post-treatment flow channel 3 for nitrogen removal treatment, and then the treatment operation of the aluminum oxidation waste gas and waste water is completed.

With continued reference to fig. 1, the waste gas treatment channel comprises a first waste gas tower 11, a second waste gas tower 12 and a third waste gas tower 13 which are connected in sequence, wherein the second waste gas tower 12 is fixedly connected below the first waste gas tower 11, and an outlet of the first waste gas tower 11 is communicated with an inlet of the second waste gas tower 12. The third waste gas tower 13 is fixedly connected below the second waste gas tower 12, an outlet of the second waste gas tower 12 is communicated with an inlet of the third waste gas tower 13, and a pH detector is installed in the first waste gas tower 11, the second waste gas tower 12 and the third waste gas tower 13.

Fixedly connected with first waste gas pipe 111 on the first waste gas tower 11, the entry of first waste gas pipe 111 is higher than the highest height of first waste gas tower 11, and fixedly connected with a plurality of first waste gas branch pipes 112 in the gas outlet department of first waste gas pipe 111, a plurality of first waste gas branch pipes 112 are located the bottom of first waste gas tower 11, and a plurality of first waste gas branch pipes 112 towards the not equidirectional of first waste gas tower 11.

A second waste gas pipe 121 is fixedly connected to the second waste gas tower 12, an inlet of the second waste gas pipe 121 is higher than the highest height of the second waste gas tower 12, a plurality of second waste gas branch pipes 122 are fixedly connected to an air outlet of the second waste gas pipe 121, the plurality of second waste gas branch pipes 122 are located at the bottom of the second waste gas tower 12, and the plurality of second waste gas branch pipes 122 face different directions of the second waste gas tower 12.

The third waste gas tower 13 is fixedly connected with a third waste gas pipe 131, an inlet of the third waste gas pipe 131 is higher than the highest height of the third waste gas tower 13, an outlet of the third waste gas pipe 131 is fixedly connected with a plurality of third waste gas branch pipes 132, the plurality of third waste gas branch pipes 132 are positioned at the bottom of the third waste gas tower 13, and the plurality of third waste gas branch pipes 132 face different directions of the third waste gas tower 13.

In this embodiment, the first waste gas tower 11 is filled with the original sodium sulfide solution, the second waste gas tower 12 is filled with the sodium sulfide solution with the pH value of 12-13, and the third waste gas tower 13 is filled with the sodium sulfide solution with the pH value of 9-11, so that when the aluminum oxide waste gas needs to be treated, workers select different waste gas towers according to the amount of aluminum oxide generated.

Since the first waste gas tower 11, the second waste gas tower 12 and the third waste gas tower 13 are communicated with each other, when the pH of the sodium sulfide solution in the first waste gas tower 11 is lowered to 12-13 along with the treatment of the aluminum oxidation waste gas, the sodium sulfide solution in the first waste gas tower 11 can be automatically transferred into the second waste gas tower 12 under the action of gravity. When the pH of the sodium sulfide solution in the second waste gas tower 12 is lowered to 9-11, the sodium sulfide solution can be transferred to the third waste gas tower 13 in the same manner. In order to control the transfer of the sodium sulfide solution, in this embodiment, the outlet of the first waste gas tower 11, the outlet of the second waste gas tower 12, and the outlet of the third waste gas tower 13 are provided with valves.

When the aluminum oxide waste gas needs to be treated, an operator can fill the aluminum oxide waste gas into the first waste gas tower 11 through the first waste gas pipe 111, and at the moment, because the plurality of first waste gas branch pipes 112 are arranged at the bottom of the first waste gas tower 11, and outlets of the plurality of first waste gas branch pipes 112 face different directions in the first waste gas tower 11, the aluminum oxide waste gas can perform gas explosion mixing reaction on the sodium sulfide solution in different directions. In addition, since the inlet of the first exhaust gas pipe 111 is higher than the height of the first exhaust gas tower 11, the sodium sulfide solution is less likely to overflow from the first exhaust gas pipe 111 due to the difference in height.

It should be noted that, since the functions of the first exhaust pipe 111, the second exhaust pipe 121, and the third exhaust pipe 131 are the same, detailed description thereof is omitted. And the number of the first exhaust branch pipe 112, the second exhaust branch pipe 122 and the third exhaust branch pipe 132 can be set arbitrarily by a worker according to practical use.

With continued reference to fig. 1, in order to improve the efficiency of the treatment of the aluminum oxidation off-gas, in this embodiment, a first spiral passage 113 is fixedly connected to the top of the first off-gas tower 11, an inlet of the first spiral passage 113 is communicated with an inlet of the first off-gas tower 11, and an outlet of the first spiral passage 113 faces the bottom of the first off-gas tower 11, so that when the first off-gas tower 11 is filled with the sodium sulfide solution, the first spiral passage 113 can stir the sodium sulfide solution by centrifugal force.

Similarly, a second spiral channel 123 is fixedly connected to the top of the second exhaust gas tower 12, an inlet of the second spiral channel 123 is communicated with an outlet of the first exhaust gas tower 11, and an outlet of the second spiral channel 123 faces the bottom of the second exhaust gas tower 12.

The top of the third waste gas tower 13 is fixedly connected with a third spiral channel 133, the inlet of the third spiral channel 133 is communicated with the outlet of the second waste gas tower 12, and the outlet of the third spiral channel 133 faces the bottom of the third waste gas tower 13. In other embodiments, in order to further improve the efficiency of treating the aluminum oxidation waste gas, mixers may be installed in the first waste gas tower 11, the second waste gas tower 12, and the third waste gas tower 13.

With continued reference to fig. 1, the wastewater treatment channel 2 comprises a chimney wastewater pool 21 and a comprehensive wastewater pool 22 which are communicated with each other, wherein the chimney wastewater pool 21 is fixedly connected below the third waste gas tower 13, and an outlet of the third waste gas tower 13 is communicated with an inlet of the chimney wastewater pool 21, so that after the third waste gas tower 13 finishes treating the aluminum oxidation waste gas, the treated chimney wastewater can be automatically transferred into the chimney wastewater pool 21 under the action of gravity.

The comprehensive wastewater tank 22 converts the aluminum oxidation wastewater into alkaline by adding sodium hydroxide and calcium hydroxide, and the comprehensive wastewater tank 22 is used for mixing the chimney wastewater and the alkaline aluminum oxidation wastewater and precipitating pollutants. Specifically, the comprehensive wastewater tank 22 is fixedly connected below the chimney wastewater tank 21, and an inlet of the comprehensive wastewater tank 22 is communicated with an outlet of the chimney wastewater tank 21, so that when the aluminum oxidation wastewater in the comprehensive wastewater tank 22 is converted into alkaline, the chimney wastewater can be automatically transferred into the comprehensive wastewater tank 22 under the action of gravity.

In this embodiment, the outlet of the chimney waste 21 and the outlet of the integrated waste 22 are also provided with valves. In order to promote more complete reaction, a spiral channel or a stirrer may be installed in the integrated wastewater tank 22.

With continued reference to fig. 1, the post-treatment flow channel 3 includes a total nitrogen treatment tank 31 and a sedimentation tank 32 which are communicated with each other, wherein the total nitrogen treatment tank 31 is fixedly connected below the comprehensive wastewater tank 22, an outlet of the comprehensive wastewater tank 22 is communicated with an inlet of the total nitrogen treatment tank 31, a filter screen is fixedly connected in the outlet of the comprehensive wastewater tank 22, and an outlet of the total nitrogen treatment tank 31 is communicated with an inlet of the sedimentation tank 32.

After the mixed wastewater tank precipitates the pollutants, the supernatant is automatically transferred into the total nitrogen treatment tank 31 under the action of gravity, and then biochemical reaction and physicochemical reaction are carried out on the supernatant in the total nitrogen treatment tank 31. After the reaction is completed, the supernatant is again transferred into the sedimentation tank 32 by gravity for sedimentation, and then the effluent meeting the discharge standard can be obtained by filtration.

In this embodiment, the outlet of the total nitrogen treatment tank 31 and the outlet of the sedimentation tank 32 are also provided with valves, and in order to promote the reaction more sufficiently, a spiral passage or a stirrer may be provided in the total nitrogen treatment tank 31 and the sedimentation tank 32. The fixed connection can be realized by pouring, bolt fixing, clamping fixing and other conventional fixed connection modes according to actual application.

The embodiment 1 of the application also discloses a use method of the aluminum oxidation waste gas and wastewater system, which comprises the following steps:

s1, waste gas treatment: firstly, filling a sodium sulfide solution into the first waste gas tower 11 through the first spiral channel 113, then filling the aluminum oxidation waste gas into the first waste gas tower 11 through the first waste gas pipe 111 for a mixing reaction, and finally obtaining primary chimney waste water, wherein in the embodiment, the pH value of the primary chimney waste water can be any data in the range of 12-13 according to practical selection;

transferring the primary chimney waste water into a second waste gas tower 12 through a second spiral channel 123, then filling new aluminum oxidation waste gas into the second waste gas tower 12 through a second waste gas pipe 121, and performing a mixing reaction with the primary chimney waste water to finally obtain secondary chimney waste water, wherein in the embodiment, the pH value of the secondary chimney waste water can be any data in the range of 11-12 according to actual selection;

transferring the secondary chimney waste water into a third waste gas tower 13 through a third spiral channel 133, then filling new aluminum oxidation waste gas into the third waste gas tower 13 through a third waste gas pipe 131, and carrying out mixing reaction with the secondary chimney waste water to finally obtain tertiary chimney waste water, wherein in the embodiment, the pH value of the tertiary chimney waste water can be any data in the range of 9-11 according to actual selection;

s2, wastewater treatment: firstly, transferring the tertiary chimney waste water into a chimney waste water tank 21, filling the aluminum oxidation waste water into a comprehensive waste water tank 22, then adding sodium hydroxide into the aluminum oxidation waste water, and when the pH value of the aluminum oxidation waste water reaches 3, adding calcium hydroxide into the aluminum oxidation waste water, so that the pH value of the aluminum oxidation waste water is adjusted to 6;

then, the chimney waste water in the chimney waste water tank 21 is transferred into the comprehensive waste water tank 22, so that the chimney waste water and the alkalized aluminum oxidation waste water are promoted to carry out mixed reaction, after the reaction is carried out for 20min, the chimney waste water and the alkalized aluminum oxidation waste water are added into a Cod processor to carry out reaction again for 30min, then, calcium hydroxide is added again, so that the pH value of the aluminum oxidation waste water is raised to 8, finally, polyacrylamide is added into the waste water treatment flow channel 2, so that the aluminum oxidation waste water is subjected to precipitation and layering, and supernatant and pollutant precipitation are obtained; it should be noted that, in this embodiment, polyacrylamide may be added when the pH value of the aluminum oxidation wastewater is between 8-8.5;

s3, post-treatment: transferring the supernatant into a total nitrogen treatment tank 31, then carrying out biochemical reaction and physicochemical reaction on the supernatant in a manner of adding a total nitrogen biological agent, then transferring the supernatant into a sedimentation tank 32, adding calcium hydroxide, filling polyacrylamide into the sedimentation tank 32 for sedimentation when the pH value of the supernatant is 8, and finally obtaining discharge water meeting the discharge standard; in this example, polyacrylamide may be added when the pH of the supernatant is between 8 and 8.5.

In this embodiment, the total nitrogen biological agent in the S3 post-treatment is composed of water-soluble PVA hollow spheres, sodium hypochlorite and biological bacteria powder, wherein the sodium hypochlorite is filled in the water-soluble PVA hollow spheres, and the biological bacteria powder is coated on the outer walls of the water-soluble PVA hollow spheres. In the embodiment, the content of sodium hypochlorite and the content of biological bacteria powder in each total nitrogen biological agent are both 20mg, and the adding amount of the total nitrogen biological agent is one part per liter.

When the supernatant needs to be post-treated, the staff can directly put the total nitrogen biological agent into the supernatant, and at the moment, the total nitrogen biological agent gradually moves downwards under the action of gravity, so that the biological bacteria powder is promoted to carry out comprehensive biochemical reaction on the supernatant.

And along with biochemical reaction's going on, the volume of biological fungus powder reduces gradually, and at this moment, water-soluble PVA hollow sphere drives biological fungus powder and sodium hypochlorite and rises gradually under the effect of buoyancy to impel biological fungus powder to carry out the comprehensive biochemical reaction of secondary to the supernatant fluid.

When the biological bacteria powder basically completely reacts, the water-soluble PVA hollow spheres are gradually dissolved, so that the sodium hypochlorite is promoted to move downwards again under the action of gravity, and the sodium hypochlorite is promoted to carry out comprehensive physicochemical reaction on the supernatant liquor.

In addition, in this embodiment, the biological powder is prepared by mixing starch paste, thiobacillus denitrificans and nitrite oxidizing bacteria, and the weight ratio of the starch paste to the thiobacillus denitrificans to the nitrite oxidizing bacteria is 1:3:2.

it should be noted that, in this embodiment, the water-soluble PVA hollow spheres are self-made by rotational molding process, the starch paste is prepared by mixing starch and water according to the ratio of 1:2, sodium hypochlorite is purchased from shanghai environmental chemical company ltd, thiobacillus denitrificans is purchased from ningbo ming boat biotechnology ltd, and nitrite oxidizing bacteria is purchased from zhejiang yucheng environmental technology ltd. And the sodium hydroxide, the hydrogen-oxygen slip cover and the polyacrylamide can be selected according to actual commercial products.

Example 2

The difference from the example 1 is that the weight ratio of the starch paste, the thiobacillus denitrificans and the nitrite oxidizing bacteria is 1:2:1.

example 3

The difference from the example 1 is that the weight ratio of the starch paste, the thiobacillus denitrificans and the nitrite oxidizing bacteria is 1:4:3.

example 4

The difference from the example 1 is that the weight ratio of the starch paste, the thiobacillus denitrificans and the nitrite oxidizing bacteria is 1:5:4.

example 5

The difference from the example 1 is that the weight ratio of the starch paste, the thiobacillus denitrificans and the nitrite oxidizing bacteria is 1:1:0.5.

example 6

The difference from example 1 is that the biological bacteria powder is made by mixing only starch paste and Thiobacillus denitrificans.

Example 7

The difference from example 1 is that the biological bacteria powder is prepared by mixing starch paste and nitrite oxidizing bacteria.

Performance test

Detection method

1. Test of denitrogenation Effect

Three portions of the effluent obtained in examples 1 to 7, 4L each, were taken, and then each sample was subjected to nitrogen content measurement and averaged.

The data for the nitrogen removal effect test of examples 1-7 are shown in Table 1.

TABLE 1 table of the results of the measurement of the denitrogenation effect of examples 1 to 7

	Nitrogen content (mg/L)
		Example 1	0.7
Example 2	5.4
		Example 3	0.6
Example 4	0.6
		Example 5	9.2
Example 6	13.5
		Example 7	14.3

As can be seen by combining examples 1, 6, and 7 with table 1, the nitrogen contents in examples 6 and 7 are significantly increased compared to example 1, which indicates that the combined use of thiobacillus denitrificans and nitrite oxidizing bacteria has a better nitrogen removal effect compared to the use of thiobacillus denitrificans or nitrite oxidizing bacteria alone.

It can be seen from the combination of examples 1 to 5 and table 1 that, compared to example 1, the nitrogen content in example 2 is significantly increased, the nitrogen content in example 5 is further increased, and the nitrogen content in examples 3 to 4 is slightly and effectively decreased, which means that the nitrogen removal effect of the total nitrogen biological agent is gradually increased as the contents of thiobacillus denitrificans and nitrite oxidizing bacteria are increased, but when the contents of thiobacillus denitrificans and nitrite oxidizing bacteria reach example 1, the nitrogen removal effect of the total nitrogen biological agent is difficult to be significantly increased even if the contents of thiobacillus denitrificans and nitrite oxidizing bacteria are further increased.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. An aluminum oxidation waste gas effluent disposal system which characterized in that: the device comprises a waste gas treatment flow channel (1), a waste water treatment flow channel (2) and a post-treatment flow channel (3), wherein an outlet of the waste gas treatment flow channel (1) is communicated with an inlet of the waste water treatment flow channel (2), and an outlet of the waste water treatment flow channel (2) is communicated with an inlet of the post-treatment flow channel (3);

the waste water treatment flow channel (2) comprises a chimney waste water pool (21) and a comprehensive waste water pool (22) which are communicated with each other, an outlet of the waste gas treatment flow channel (1) is communicated with the chimney waste water pool (21), an inlet of the comprehensive waste water pool (22) is communicated with an outlet of the chimney waste water pool (21), the comprehensive waste water pool (22) is used for converting aluminum oxidation waste water into alkalinity, and the comprehensive waste water pool (22) is used for mixing the chimney waste water and the alkaline aluminum oxidation waste water and precipitating pollutants;

the waste gas treatment flow channel (1) comprises a first waste gas tower (11), a second waste gas tower (12) and a third waste gas tower (13) which are connected in sequence, wherein the outlet of the third waste gas tower (13) is communicated with the inlet of a chimney waste water pool (21); a first waste gas pipe (111) is arranged on the first waste gas tower (11), and the first waste gas tower (11) is used for storing and stirring sodium sulfide solution; a second waste gas pipe (121) is arranged on the second waste gas tower (12), and the second waste gas tower (12) is used for storing and stirring the primary treatment chimney waste water flowing out of the first waste gas tower (11); and a third waste gas and waste water pipe (131) is arranged on the third waste gas tower (13), and the third waste gas tower (13) is used for storing and stirring the secondary treatment chimney waste water flowing out of the second waste gas tower (12).

2. The aluminum oxidation waste gas and wastewater treatment system according to claim 1, wherein: the post-treatment flow channel (3) comprises a total nitrogen treatment pool (31) and a sedimentation pool (32), an outlet of the comprehensive wastewater pool (22) is communicated with an inlet of the total nitrogen treatment pool (31), and a filter screen is arranged in the outlet of the comprehensive wastewater pool (22); the outlet of the total nitrogen treatment tank (31) is communicated with the inlet of the sedimentation tank (32).

3. The aluminum oxidation waste gas and wastewater treatment system according to claim 1, wherein: the gas outlet of the first waste gas pipe (111) is communicated with the bottom of the first waste gas tower (11), the gas outlet of the second waste gas pipe (121) is communicated with the bottom of the second waste gas tower (12), and the gas outlet of the third waste gas pipe (131) is communicated with the bottom of the third waste gas tower (13).

4. The aluminum oxidation waste gas and wastewater treatment system according to claim 3, wherein: the air inlet of the first waste gas pipe (111) is higher than the highest height of the first waste gas tower (11), the air inlet of the second waste gas pipe (121) is higher than the highest height of the second waste gas tower (12), and the air inlet of the third waste gas pipe (131) is higher than the highest height of the third waste gas tower (13).

5. The aluminum oxidation waste gas and wastewater treatment system according to claim 3, wherein: a plurality of first exhaust branch pipes (112) are arranged at the air outlets of the first exhaust pipes (111), and the air outlets of the first exhaust branch pipes (112) face different directions; a plurality of second exhaust gas branch pipes (122) are arranged at the gas outlets of the second exhaust gas pipes (121), and the gas outlets of the second exhaust gas branch pipes (122) face different directions; and a plurality of third waste gas branch pipes (132) are arranged at the gas outlet of the third waste gas pipe (131), and the gas outlets of the third waste gas branch pipes (132) face different directions.

6. The aluminum oxidation waste gas and wastewater treatment system of claim 1, wherein: the second waste gas tower (12) is positioned below the first waste gas tower (11), the third waste gas tower (13) is positioned below the second waste gas tower (12), and the first waste gas tower (11), the second waste gas tower (12) and the third waste gas tower (13) are communicated with each other.

7. The aluminum oxidation waste gas and wastewater treatment system of claim 6, wherein: a first spiral channel (113) is arranged in the first waste gas tower (11), the inlet of the first waste gas tower (11) is communicated with the inlet of the first spiral channel (113), and the outlet of the first spiral channel (113) faces to the bottom of the first waste gas tower (11);

a second spiral channel (123) is arranged in the second waste gas tower (12), the outlet of the first waste gas tower (11) is communicated with the inlet of the second spiral channel (123), and the outlet of the second spiral channel (123) faces the bottom of the second waste gas tower (12);

a third spiral channel (133) is arranged in the third waste gas tower (13), the outlet of the second waste gas tower (12) is communicated with the inlet of the third spiral channel (133), and the outlet of the third spiral channel (133) faces to the bottom of the third waste gas tower (13).

8. A method of using the aluminum oxidation waste gas and wastewater treatment system of any one of claims 1 to 7, comprising the steps of:

s1, waste gas treatment: firstly, filling a sodium sulfide solution into a first waste gas tower (11), then filling aluminum oxide waste gas into the first waste gas tower (11) for mixed reaction, and obtaining primary chimney waste water when the pH value of the mixed solution in the first waste gas tower (11) is 12-13;

transferring the primary chimney waste water into a second waste gas tower (12), then filling new aluminum oxidation waste gas into the second waste gas tower (12) and carrying out mixed reaction with the primary chimney waste water, and obtaining secondary chimney waste water when the pH value of a mixed solution in the second waste gas tower (12) is 11-12;

transferring the secondary chimney waste water into a third waste gas tower (13), then filling new aluminum oxidation waste gas into the third waste gas tower (13) and carrying out mixed reaction with the secondary chimney waste water, and obtaining tertiary chimney waste water when the pH value of a mixed solution in the third waste gas tower (13) is 9-11;

s2, wastewater treatment: filling the aluminum oxidation wastewater into the wastewater treatment flow channel (2), and then adding calcium hydroxide into the wastewater treatment flow channel (2), so as to raise the pH value of the aluminum oxidation wastewater to 6-7;

then gradually adding the tertiary chimney wastewater into the wastewater treatment flow channel (2), mixing the tertiary chimney wastewater with the aluminum oxidation wastewater, and adding a cod treatment agent for reaction for 30-40min;

then, adding calcium hydroxide into the wastewater treatment flow channel (2) again to raise the pH value of the aluminum oxidation wastewater to 8-8.5, and finally adding polyacrylamide into the wastewater treatment flow channel (2) to precipitate and stratify the aluminum oxidation wastewater to obtain supernatant and pollutant precipitate;

s3, post-processing: and transferring the supernatant into the post-treatment flow channel (3), then carrying out biochemical reaction and physicochemical reaction on the supernatant, then adding calcium hydroxide into the post-treatment flow channel (3), and when the pH value of the supernatant is between 8 and 8.5, adding polyacrylamide into the post-treatment flow channel (3) for precipitation to finally obtain the discharge water meeting the discharge standard.

9. The use method of the aluminum oxidation waste gas and wastewater treatment system according to claim 8, wherein in the S3 post-treatment, the biochemical reaction and the physical and chemical reaction are directly treated by total nitrogen biological agent;

the total nitrogen biological agent consists of a water-soluble PVA hollow sphere, sodium hypochlorite and biological bacteria powder, wherein the sodium hypochlorite is filled in the water-soluble PVA hollow sphere, and the biological bacteria powder is coated outside the water-soluble PVA hollow sphere; the biological bacteria powder is prepared by mixing starch paste, thiobacillus denitrificans and nitrite oxidizing bacteria, wherein the weight ratio of the starch paste to the thiobacillus denitrificans to the nitrite oxidizing bacteria is 1: (2-4): (1-3).

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