CN221166385U - Aquaculture wastewater denitrification recycling system - Google Patents

Abstract

The utility model discloses a denitrification and reuse system for aquaculture wastewater, comprising a short-range nitrification reaction device, an anaerobic ammonium oxidation coupled denitrification device and an ozone treatment device, wherein the short-range nitrification reaction device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline, and the ozone treatment device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline. The utility model can quickly start short-range nitrification to treat industrialized circulating aquaculture wastewater, and solve the problem of ammonia nitrogen and other water pollutants left over from the treatment of industrialized circulating aquaculture wastewater.

Description

Aquaculture wastewater denitrification and reuse system

Technical Field

The utility model relates to the technical field of biological sewage treatment, and more specifically, to an aquaculture wastewater denitrification and reuse system.

Background technique

With the progress of the times, industrial aquaculture technology has been continuously developed in a large number of studies and practices, and has brought economic benefits. This progress has promoted the continuous expansion of industrial aquaculture scale and the increase of aquaculture density. The water pollutants produced mainly include organic matter, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, etc. However, although this development meets social needs, it also puts higher requirements on wastewater treatment technology. Therefore, in the process of aquaculture wastewater treatment, how to quickly and efficiently remove or recycle a large number of aquaculture pollutants is still a difficult point in the research of this technology.

In the process of aquaculture, only a small amount of bait is converted into animal protein, and the remaining residual bait and excrement enter the water body in a dissolved form, and are rapidly decomposed and converted under appropriate conditions, producing a large amount of nitrogen and phosphorus compounds, which leads to the deterioration of water quality and directly affects the growth and yield of the aquaculture objects. Therefore, considering that the object to be treated is industrial circulating aquaculture wastewater and the high-efficiency denitrification performance to be achieved, a synchronous partial nitrification-anaerobic ammonia oxidation coupled denitrification process is used to treat industrial circulating aquaculture wastewater. At present, the synchronous partial nitrification-anaerobic ammonia oxidation coupled denitrification process is mostly used in high-concentration ammonia nitrogen wastewater, such as leachate, sludge digestion liquid, etc. The current difficulty of this process is that the source of nitrite nitrogen is unstable, which makes the anaerobic ammonia oxidation treatment step start slowly.

Utility Model Content

In order to solve the above problems, the utility model proposes a denitrification and reuse system for aquaculture wastewater, which utilizes a short-range nitrification reaction device, an anaerobic ammonium oxidation coupled denitrification device and an ozone treatment device to quickly start short-range nitrification-anaerobic ammonium oxidation to treat industrial circulating aquaculture wastewater, thereby solving the problem of ammonia nitrogen and other water pollutants left over from the treatment of industrial circulating aquaculture wastewater.

To achieve the above-mentioned purpose, the utility model provides an aquaculture wastewater denitrification and reuse system, comprising a short-range nitrification reaction device, an anaerobic ammonium oxidation coupled denitrification device and an ozone treatment device. The short-range nitrification reaction device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline, and the ozone treatment device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline.

In the technical scheme, the wastewater to be treated is charged into a short-range nitrification reaction device, and the reaction conditions are controlled by the short-range nitrification reaction device to carry out a short-range nitrification reaction, so that the nitrite nitrogen and ammonia nitrogen in the treated wastewater are maintained at an optimal ratio. The wastewater enters the anaerobic ammonia oxidation coupled denitrification device for anaerobic ammonia oxidation denitrification to generate nitrogen gas and a small amount of nitrate nitrogen, and then enters the ozone treatment device for sterilization and disinfection and oxidation and decomposition of nitrogen-containing organic matter remaining in the water body, and finally obtains usable clean water. The wastewater treatment process is concise and tight, and the treatment effect is good.

As a preferred embodiment, the short-range nitrification reaction device includes a first reaction container, a stirring component, an ultrasonic generator, a first DO/pH online monitor and an air pump. The stirring component is installed on the top of the first reaction container and one end of the stirring component extends into the first reaction container for stirring. One end of the ultrasonic generator extends into the first reaction container. One end of the first DO/pH online monitor extends into the first reaction container. The air pump is connected to the bottom of the first reaction container through a pipeline. The stirring component is used to stir the wastewater and the ultrasonic generator is used to improve the nitrification performance, improve the nitrite nitrogen accumulation effect, reduce the nitrate nitrogen in the effluent, so that the treated effluent has a suitable ratio of ammonia nitrogen and nitrite nitrogen. The air pump is used to introduce air into the first reaction container to control the reaction conditions. The first DO/pH online monitor is used to detect the component content in the first reaction container, so that the nitrite nitrogen and ammonia nitrogen in the wastewater can be maintained at an optimal ratio.

As a preferred embodiment, the anaerobic ammonium oxidation coupled denitrification device includes a second reaction container, a second DO/pH online monitor, a suspension ball, a gas-liquid-solid three-phase separator and a gas collection component. The second reaction container is connected to the first reaction container through a first pipeline. The suspension ball is arranged in the second reaction container. The outer wall of the suspension ball is provided with a plurality of through holes. The suspension ball is filled with biological fillers. One end of the second DO/pH online monitor extends into the second reaction container. The gas-liquid-solid three-phase separator is arranged in the second reaction container. The gas collection component is arranged in the second reaction container. The top of the reactor is connected with the gas-liquid-solid three-phase separator, the side wall of the second reaction container is provided with a mud outlet connected with the gas-liquid-solid three-phase separator, the biological filler used for the anaerobic ammonia oxidation denitrification reaction can be accommodated by the suspension ball to prevent the biological filler from dispersing so as to control the reaction conditions, the gas, liquid and solid produced by the reaction can be separated by the gas-liquid-solid three-phase separator, the gas collecting component can collect the nitrogen produced by the anaerobic ammonia oxidation denitrification reaction, the second DO/pH online monitor is used to detect the pH value and DO value in the second reactor, and the mud outlet is used to sample the solid in order to know the reaction progress.

As a preferred solution, since nitrogen is relatively light, in order to collect nitrogen, the gas collection assembly includes a gas valve and a gas collection bag, the gas valve is connected to the top of the second reaction container, and the gas collection bag is connected to the gas valve.

As a preferred solution, in order to sterilize and disinfect the water produced by the anaerobic ammonium oxidation denitrification reaction in the anaerobic ammonium oxidation coupled denitrification device, the ozone treatment device includes a third reaction container, an ozone generator, an ultraviolet lamp and a gas-liquid mixing pump. The second reaction container and the ozone generator are respectively connected to the inlet of the gas-liquid mixing pump through a pipeline, and the bottom of the third reaction container is connected to the outlet of the gas-liquid mixing pump through a pipeline. The ultraviolet lamp is arranged in the third reaction container, and the water treated by the anaerobic ammonium oxidation coupled denitrification device and the ozone generated by the ozone generator are introduced into the third reaction container through the gas-liquid mixing pump for sterilization and disinfection, wherein the ultraviolet lamp can assist in sterilization and disinfection to improve water quality.

As a preferred solution, in order to accelerate the biochemical decomposition of organic matter in water and thus achieve sewage purification, a first aeration plate connected to an air pump is provided in the first reaction container, and a second aeration plate connected to a gas-liquid mixing pump is provided in the third reaction container.

As a preferred solution, in order to avoid the accumulation of nitrification sludge in the partially nitrified effluent and affect the anaerobic ammonia oxidation denitrification reaction, a fourth reaction container connected to the first pipeline is provided between the second reaction container and the first reaction container, the first pipeline is divided into two sections, the first pipeline of the first section is respectively connected to the top of the first container and the top of the fourth container, the first pipeline of the second section is respectively connected to the bottom of the fourth container and the bottom of the second container, the fourth reaction container is connected to a nitrogen bottle through a pipeline, a third aeration disk connected to the nitrogen bottle is provided in the fourth reaction container, a first reflux pipe connected to the first reaction container and the fourth reaction container is provided, a reflux pump is provided on the first reflux pipe, a water inlet pump is provided on the first pipeline between the fourth reaction container and the second reaction container, the fourth reaction container is used for precipitation treatment of the partially nitrified water, and the nitrogen bottle passes nitrogen into the fourth reaction container through the third aeration disk to reduce the DO concentration of the water.

As a preferred solution, the side wall of the first reaction container is provided with a plurality of first sampling ports in the vertical direction, and sampling can be performed through the plurality of first sampling ports to facilitate knowing the matrix ratio and alkalinity of water, thereby adjusting the reaction conditions.

As a preferred embodiment, the side wall of the second reaction container is provided with a plurality of second sampling ports in the vertical direction, one of the second sampling ports is connected to the bottom of the second reaction container through a pipe and a peristaltic pump is provided on the pipe. The treated liquid can be refluxed into the bottom of the second reaction container through the peristaltic pump, so that the treated liquid can fully carry out the anaerobic ammonia oxidation denitrification reaction. By sampling the second sampling port, when large-particle brown-red anaerobic ammonia oxidation granular sludge is produced, the nitrate nitrogen concentration is low and the total nitrogen removal rate reaches more than 89%, it indicates that the system of the utility model is successfully started.

As a preferred solution, in order to further control the reaction regulation, a first temperature control element is provided in the first reaction container, and a second temperature control element is provided in the second reaction container. The first temperature control element and the second temperature control element are used to control the reaction temperature.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model can reduce aeration energy consumption by quickly starting short-range nitrification by utilizing a short-range nitrification reaction device and an anaerobic ammonium oxidation coupled denitrification device.

2. Use short-range nitrification reaction devices and anaerobic ammonium oxidation coupled denitrification devices to efficiently remove the remaining ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in industrial circulating aquaculture wastewater, and then use ozone treatment devices to remove organic matter and ammonia nitrogen in the circulating aquaculture wastewater, improve the water quality of circulating aquaculture water, and thus increase the reuse rate of aquaculture water in the aquaculture system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the present embodiment 1;

FIG2 is a schematic diagram of the structure of the present embodiment 2;

FIG3 is a schematic diagram of the structure of the third embodiment.

In the figure: a first reaction vessel 1; a stirring blade 2; a driving motor 3; an ultrasonic generator 4; a first DO/pH online monitor 5; an air pump 6; a first aeration plate 7; a first sampling port 8; a first temperature control element 9; a second reaction vessel 10; a second DO/pH online monitor 11; a suspension ball 12; a gas-liquid-solid three-phase separator 13; an air valve 14; an air collecting bag 15; a mud discharge port 16; a second sampling port 17; a peristaltic pump 18; a second temperature control element 19; a third reaction vessel 20; an ozone generator 21; an ultraviolet lamp 22; a gas-liquid mixing pump 23; a second aeration plate 24; a fourth reaction vessel 25; a nitrogen bottle 26; a reflux pump 27; a third aeration plate 28; a water inlet pump 29; and a first pipeline 30.

Detailed ways

The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

Embodiment 1:

As shown in Figure 1, a system for denitrification and reuse of aquaculture wastewater is provided, including a short-cut nitrification reaction device, an anaerobic ammonium oxidation coupled denitrification device and an ozone treatment device. The short-cut nitrification reaction device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline, and the ozone treatment device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline.

Specifically, the short-range nitrification reaction device includes a first reaction container 1, a stirring component, an ultrasonic generator 4, a first DO/pH online monitor 5 and an air pump 6. The stirring component is installed on the top of the first reaction container 1 and one end of the stirring component extends into the first reaction container 1 for stirring. One end of the ultrasonic generator 4 extends into the first reaction container 1. One end of the first DO/pH online monitor 5 extends into the first reaction container 1. The air pump 6 is connected to the bottom of the first reaction container 1 through a pipeline. A first temperature control element 9 is provided in the first reaction container 1. A first aeration plate 7 connected to the air pump 6 is provided in the first reaction container 1.

In this embodiment, aerobic nitrification sludge is inoculated in the first reaction container 1, and the concentration of suspended solids (MLSS) of the mixed liquor after inoculation is about 1960 mg/L, and the sedimentation ratio (SV30) is about 32%. The reaction temperature is maintained at 27±1°C by the first temperature control element 9, and the pH value detected by the first DO/pH online monitor 5 is maintained at 8-8.2. The ultrasonic generator 4 is a probe ultrasonic generator with an ultrasonic intensity of 0.1 W/ml. Then, the air pump 6 is turned on, and the first aeration disk 7 adopts an intermittent aeration operation mode (aeration ratio of 3:1, single aeration time of 15 min, aeration flow rate of 1 L/min), and 5 mg/L of hydroxylamine is added to further improve the nitrification performance, improve the accumulation effect of nitrite nitrogen, reduce effluent nitrate nitrogen, and make the treated water have a suitable ratio of ammonia nitrogen and nitrite nitrogen.

In this embodiment, the stirring assembly includes two stirring blades 2 and a driving motor 3. The driving motor 3 is installed on the top of the first reaction container 1. The driving shaft of the driving motor 3 extends into the first reaction container 1 and is coaxially connected to the two stirring blades 2. The driving motor 3 drives the stirring blades 2 to rotate at a rate of 25r/min.

The anaerobic ammonia oxidation coupled denitrification device includes a second reaction container 10, a second DO/pH online monitor 11, a suspension ball 12, a gas-liquid-solid three-phase separator 13 and a gas collecting component. The second reaction container 10 is connected to the first reaction container 1 through a first pipeline 30. The suspension ball 12 is arranged in the second reaction container 10. The outer wall of the suspension ball 12 is provided with a plurality of through holes. The suspension ball 12 contains biological fillers. One end of the second DO/pH online monitor 11 extends into the second reaction container 10. The gas-liquid-solid three-phase separator 13 is arranged in the second reaction container 10. The gas collecting component is arranged on the top of the second reaction container 10 and is connected to the gas-liquid-solid three-phase separator 13. The side wall of the second reaction container 10 is provided with a mud discharge port 16 connected to the gas-liquid-solid three-phase separator 13. A second temperature control element 19 is arranged in the second reaction container 10.

In this embodiment, the suspension ball 12 is embedded with a polyurethane black sponge, and the biological filler is contained in the polyurethane black sponge and contacts with the wastewater through the through hole of the suspension ball 12. The biological filler is anaerobic ammonia-oxidizing bacteria and denitrifying bacteria. In order to avoid affecting the progress of the reaction, the second reaction container 10 is covered with a shading cloth or the container is made of a light-proof material. The second temperature control element 19 controls the reaction temperature to 30±0.2°C. The gas separated by the gas-liquid-solid three-phase separator 13 is collected by a gas collecting assembly, and the gas therein is subjected to a component analysis to monitor the anaerobic ammonia-oxidation reaction. The solid separated by the gas-liquid-solid three-phase separator 13 can be discharged through the mud discharge port 16.

Specifically, the gas collecting assembly includes a gas valve 14 and a gas collecting bag 15. The gas valve 14 is connected to the top of the second reaction container 10, and the gas collecting bag 15 is connected to the gas valve 14. In this embodiment, the gas collecting bag 15 can collect nitrogen to achieve denitrification.

Specifically, a plurality of first sampling ports 8 are provided on the side wall of the first reaction container 1 along the vertical direction.

In this embodiment, by sampling at the first sampling port 8 at regular intervals, the substrate ratio and alkalinity of the short-range nitrification reaction water can be known, and the reaction conditions can be adjusted to maintain the concentration ratio of ammonia nitrogen to nitrite nitrogen at 1:1.32.

Specifically, a plurality of second sampling ports 17 are provided on the side wall of the second reaction container 10 in the vertical direction, and one of the second sampling ports 17 is connected to the bottom of the second reaction container 10 through a pipeline, and a peristaltic pump 18 is provided on the pipeline.

In this embodiment, the upper layer of wastewater in the second reaction container 10 is passed into the bottom of the second reaction container 10 by the peristaltic pump 18 to realize internal circulation, so that the reaction is more complete.

Embodiment 2:

This embodiment is similar to Embodiment 1, except that, in this embodiment, as shown in FIG. 2 , the ozone treatment device includes a third reaction container 20, an ozone generator 21, an ultraviolet lamp 22 and a gas-liquid mixing pump 23, the second reaction container 10 and the ozone generator 21 are respectively connected to the inlet of the gas-liquid mixing pump 23 through a pipeline, the bottom of the third reaction container 20 is connected to the outlet of the gas-liquid mixing pump 23 through a pipeline, the ultraviolet lamp 22 is arranged in the third reaction container 20, and the third reaction container 20 is provided with a second aeration plate 24 connected to the gas-liquid mixing pump 23.

In this embodiment, the wastewater treated by the second reaction container 10 and the ozone generated by the ozone generator 21 are passed through the second aeration plate 24 from the bottom into the third reaction container 20 under the action of the gas-liquid mixing pump 23. The ozone concentration is 1.5 mg/L. At the same time, the ultraviolet lamp 22 is turned on to assist in sterilization and disinfection to improve the water quality of the effluent.

Embodiment 3:

This embodiment is similar to Embodiments 1 and 2, except that, in this embodiment, as shown in FIG3 , a fourth reaction container 25 connected to a first pipeline 30 is provided between the second reaction container 10 and the first reaction container 1, the fourth reaction container 25 is connected to a nitrogen bottle 26 through a pipeline, a third aeration plate 28 connected to the nitrogen bottle 26 is provided in the fourth reaction container 25, a first reflux pipe connected to the first reaction container 1 and the fourth reaction container 25 is provided, a reflux pump 27 is provided on the first reflux pipe, and a water inlet pump 29 is provided on the first pipeline 30 between the fourth reaction container 25 and the second reaction container 10.

In this embodiment, the first pipeline 30 is divided into two sections. The wastewater after the reaction in the first reaction container 1 flows out from the outlet of the upper side wall thereof and enters the fourth reaction container 25 through the first pipeline 30 of the first section. The nitrogen bottle 26 performs nitrogen aeration on the wastewater in the fourth reaction container 25 to reduce the DO value. Subsequently, the fourth reaction container 25 flows back to the bottom of the first reaction container 1 through the first reflux pipe under the action of the reflux pump 27 to realize a cyclic reaction, which can reduce the accumulation of nitrification sludge in the wastewater. Then, the wastewater in the fourth reaction container 25 is passed into the second reaction container 10 through the first pipeline 30 of the second section through the water inlet pump 29.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims (10)

1. A denitrification and reuse system for aquaculture wastewater, characterized in that it includes a short-cut nitrification reaction device, an anaerobic ammonium oxidation coupled denitrification device and an ozone treatment device, wherein the short-cut nitrification reaction device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline, and the ozone treatment device is connected to the anaerobic ammonium oxidation coupled denitrification device through a pipeline. 2. A system for denitrifying and reusing aquaculture wastewater according to claim 1, characterized in that the short-range nitrification reaction device comprises a first reaction vessel (1), a stirring assembly, an ultrasonic generator (4), a first DO/pH online monitor (5) and an air pump (6), wherein the stirring assembly is installed on the top of the first reaction vessel (1) and one end of the stirring assembly extends into the first reaction vessel (1) for stirring, one end of the ultrasonic generator (4) extends into the first reaction vessel (1), one end of the first DO/pH online monitor (5) extends into the first reaction vessel (1), and the air pump (6) is connected to the bottom of the first reaction vessel (1) through a pipeline. 3. A system for denitrifying and reusing aquaculture wastewater according to claim 2, characterized in that the anaerobic ammonia oxidation coupled denitrification device comprises a second reaction container (10), a second DO/pH online monitor (11), a suspension ball (12), a gas-liquid-solid three-phase separator (13) and a gas collecting component, the second reaction container (10) is connected to the first reaction container (1) through a first pipeline (30), the suspension ball (12) is arranged in the second reaction container (10), the outer wall of the suspension ball (12) is provided with a plurality of through holes, the suspension ball (12) is filled with biological filler, one end of the second DO/pH online monitor (11) extends into the second reaction container (10), the gas-liquid-solid three-phase separator (13) is arranged in the second reaction container (10), the gas collecting component is arranged at the top of the second reaction container (10) and is connected to the gas-liquid-solid three-phase separator (13), and the side wall of the second reaction container (10) is provided with a mud discharge port (16) connected to the gas-liquid-solid three-phase separator (13). 4. An aquaculture wastewater denitrification and reuse system according to claim 3, characterized in that the gas collecting component includes an air valve (14) and an air collecting bag (15), the air valve (14) is connected to the top of the second reaction container (10), and the air collecting bag (15) is connected to the air valve (14). 5. An aquaculture wastewater denitrification and reuse system according to claim 3, characterized in that the ozone treatment device comprises a third reaction container (20), an ozone generator (21), an ultraviolet lamp (22) and a gas-liquid mixing pump (23), the second reaction container (10) and the ozone generator (21) are respectively connected to the inlet of the gas-liquid mixing pump (23) through a pipeline, the bottom of the third reaction container (20) is connected to the outlet of the gas-liquid mixing pump (23) through a pipeline, and the ultraviolet lamp (22) is arranged in the third reaction container (20). 6. An aquaculture wastewater denitrification and reuse system according to claim 5, characterized in that the first reaction container (1) is provided with a first aeration plate (7) connected to an air pump (6), and the third reaction container (20) is provided with a second aeration plate (24) connected to a gas-liquid mixing pump (23). 7. A system for denitrifying and reusing aquaculture wastewater according to claim 3, characterized in that a fourth reaction container (25) connected to a first pipeline (30) is provided between the second reaction container (10) and the first reaction container (1), the fourth reaction container (25) is connected to a nitrogen bottle (26) through a pipeline, a third aeration disk (28) connected to the nitrogen bottle (26) is provided in the fourth reaction container (25), a first reflux pipe connected to the first reaction container (1) and the fourth reaction container (25) is provided, a reflux pump (27) is provided on the first reflux pipe, and a water inlet pump (29) is provided on the first pipeline (30) between the fourth reaction container (25) and the second reaction container (10). 8. An aquaculture wastewater denitrification and reuse system according to claim 2, characterized in that the side wall of the first reaction container (1) is provided with a plurality of first sampling ports (8) in the vertical direction. 9. An aquaculture wastewater denitrification and reuse system according to claim 7, characterized in that the side wall of the second reaction container (10) is provided with a plurality of second sampling ports (17) in the vertical direction, and one of the second sampling ports (17) is connected to the bottom of the second reaction container (10) through a pipeline and a peristaltic pump (18) is provided on the pipeline. 10. An aquaculture wastewater denitrification and reuse system according to claim 3, characterized in that a first temperature control element (9) is provided in the first reaction container (1), and a second temperature control element (19) is provided in the second reaction container (10).