CN114988580A

CN114988580A - Method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha

Info

Publication number: CN114988580A
Application number: CN202210838233.3A
Authority: CN
Inventors: 赵丽萍
Original assignee: Binzhou University
Current assignee: Binzhou University
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-09-02

Abstract

The invention discloses a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, which comprises the following steps of: A. manufacturing a frame; B. manufacturing a foam brick, and embedding the foam brick into the frame; C. a plurality of foam bricks are communicated through carbon dioxide supply pipes; D. sinking the frame into a designated water area and anchoring; E. a plurality of frames are connected in series to form a fence wall; F. growing the enteromorpha; G. and harvesting components are respectively installed on two sides of the fence wall to harvest enteromorpha. According to the invention, the rapid growth characteristic of green alga enteromorpha in high-nitrogen seawater is fully utilized, the carbon dioxide fixation is realized, the denitrification treatment is carried out on the mariculture high-nitrogen wastewater, the green alga enteromorpha outbreak caused by the high-nitrogen seawater is controlled in the enteromorpha culture fence wall, and the seawater permeating out of the fence wall does not cause the green alga outbreak any more.

Description

Method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha

Technical Field

The invention relates to the technical field of aquaculture wastewater treatment, in particular to a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha.

Background

Although the mariculture can bring considerable income to farmers, the tail water of the mariculture also has great influence on the water environment. In recent years, the marine culture along the coast of China mostly increases the culture density to improve the yield, so that a large amount of residual bait and excrement are discharged into a water body, the content of nitrogen and phosphorus in the water body of a culture pond is increased rapidly, and the eutrophication of seawater is caused; the cultivation pollution mainly comprises nutrient pollution, medicine pollution, substrate sludge enrichment pollution and the like in the cultivation process, the pollution caused by the pollutants is mainly shown in that the discharge amount of nitrogen (N), phosphorus (P), Chemical Oxygen Demand (COD) and the like brought by the cultivation process exceeds the environmental bearing capacity and the self-purification capacity of offshore ocean, further seawater eutrophication and damage and abnormality of the offshore ecological environment brought by the seawater eutrophication are caused, the cultivation environment is deteriorated, the generated cultivation tail water can cause severe influence on the water quality of offshore sea areas and the offshore ecological environment, and enteromorpha is seriously caused.

The existing seawater culture wastewater denitrification technology and carbon dioxide fixation technology are separated, cannot be realized at the same time, and do not fully play a role of green alga enteromorpha outbreak as a eutrophication consequence. Therefore, a method for treating high-nitrogen-content mariculture wastewater by using enteromorpha is needed to solve the problems.

Disclosure of Invention

The invention aims to provide a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, which aims to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, which comprises the following steps of:

A. manufacturing a frame;

B. manufacturing a foam brick, and embedding the foam brick into the frame;

C. a plurality of foam bricks are communicated through carbon dioxide supply pipes;

D. the frame is sunk into a designated water area and anchored;

E. a plurality of frames are connected in series to form a fence wall;

F. growing the enteromorpha;

and G, temporarily installing harvesting components on two sides of the fence wall respectively to harvest enteromorpha.

Preferably, in the step B, four water through holes are formed in one side of the foam brick in a penetrating manner, and the four water through holes are distributed at equal intervals in the circumferential direction; a communicating hole is formed in the center of the other adjacent side of the foam brick in a penetrating mode, a carbon dioxide tube is fixedly connected in the communicating hole, and the carbon dioxide tubes are communicated; the side wall of the carbon dioxide tube is provided with a plurality of diffusion heads.

Preferably, the water through holes and the communication holes are perpendicular to each other.

Preferably, in the step B, the foam brick comprises an outer carrier, and an inner carrier is fixedly embedded in the inner cavity of the outer carrier; the outer side surface of the outer carrier is provided with a plurality of concave circular grooves, the concave circular grooves are arranged around the water passing holes and the communication holes, and the enteromorpha is planted in the concave circular grooves.

Preferably, the upper end and the lower end of the outer carrier are provided with grooves, the grooves are internally provided with inoculation beds, and the inoculation beds are inoculated with nitrodenitrifying bacteria.

Preferably, in the step E, the density of the fence wall is smaller than that of seawater, the bottom end of the fence wall is anchored with the seabed, and the upper part of the fence wall is provided with a floating mark.

Preferably, in the step G, the harvesting assembly comprises fixing rods fixedly mounted at the upper and lower ends of the side wall of the enclosure wall respectively, and the two fixing rods are arranged in parallel; two pulleys are symmetrically sleeved on the fixed rod, the two pulleys are rotatably connected with the fixed rod, and the pulleys on the two fixed rods are correspondingly arranged; two be provided with the slip area between the dead lever, the internal surface in slip area with the lateral surface butt of pulley, the lateral surface rigid coupling in slip area has the blade, the blade with the lateral wall sliding contact of enclosure wall.

Preferably, in the step G, when the enteromorpha is harvested, fencing barriers are arranged on the periphery of the fence wall.

Preferably, in step E, a plurality of the fence walls are provided.

The invention discloses the following technical effects: the invention discloses a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, wherein the high-nitrogen-content wastewater is exchanged with external seawater through a fence wall, is firstly adsorbed on a foam brick and then is absorbed or removed by nitrifying and denitrifying bacteria and the enteromorpha inside; the foam bricks are communicated with a carbon dioxide gas supply pipe, a proper environment is provided for nitrifying and denitrifying bacteria by utilizing carbon dioxide, the nitrification and denitrification processes are controlled by controlling the content of oxygen in the carbon dioxide mixed gas, and carbon dioxide is provided for the growth of enteromorpha; the plurality of frames are connected in series to form the fence wall, so that the length is convenient to adjust, and the applicability is strong; the enteromorpha is harvested after growing to a certain degree, the water pollution caused by the overgrowth of the enteromorpha is prevented, the harvested enteromorpha can also be used as feed, and the cost is recovered. According to the invention, the rapid growth characteristic of green alga enteromorpha in high-nitrogen seawater is fully utilized, the carbon dioxide fixation is realized, the denitrification treatment is carried out on the mariculture high-nitrogen wastewater, the green alga enteromorpha outbreak caused by the high-nitrogen seawater is controlled in the enteromorpha culture fence wall, and the seawater permeating out of the fence wall does not cause the green alga outbreak any more.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an axial view of the enclosure wall structure of the present invention;

fig. 2 is a schematic view of the harvesting assembly of the present invention;

FIG. 3 is an axial view of a foam tile of the present invention;

FIG. 4 is a schematic view of the foam tile construction of the present invention;

FIG. 5 is a side view of a foam tile of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 2;

wherein, 1, a frame; 2. a foam brick; 3. a carbon dioxide supply pipe; 4. a fence wall; 5. water passing holes; 6. a communicating hole; 7. a carbon dioxide tube; 8. a diffusion head; 9. an outer carrier; 10. an inner carrier; 11. a concave circular groove; 12. a seed bed; 13. fixing the rod; 14. a pulley; 15. a sliding belt; 16. a blade; 17. and (7) fencing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-6, the invention provides a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, which comprises the following steps:

A. manufacturing a frame 1;

B. manufacturing a foam brick 2, and embedding the foam brick 2 into the frame 1;

C. a plurality of foam bricks 2 are communicated through a carbon dioxide supply pipe 3;

D. the frame 1 sinks into a designated water area and is anchored;

E. a plurality of frames 1 are connected in series to form a fence wall 4;

F. growing the enteromorpha;

G. and harvesting components are temporarily installed on two sides of the fence wall 4 respectively to harvest enteromorpha prolifera.

The invention discloses a method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha, wherein the high-nitrogen-content wastewater is exchanged with external seawater through a fence wall 4, is firstly adsorbed on a foam brick 2 and is then absorbed or removed by nitrifying and denitrifying bacteria and the enteromorpha inside; the foam brick 2 is communicated with a carbon dioxide supply pipe 3, carbon dioxide is used for providing a proper environment for nitrifying and denitrifying bacteria, the content of oxygen in carbon dioxide mixed gas is controlled, the nitrification and denitrification processes are controlled, and carbon dioxide is provided for the growth of enteromorpha; the frames 1 are connected in series to form the fence wall 4, so that the length adjustment is convenient and the applicability is strong; the enteromorpha is harvested after growing to a certain degree, so that the water pollution caused by the overgrowth of the enteromorpha is prevented, the harvested enteromorpha can also be used as a feed, and the cost is recovered.

In the step B, four water through holes 5 are formed in one side of the foam brick 2 in a penetrating mode, and the four water through holes 5 are distributed at equal intervals in the circumferential direction; a communicating hole 6 is formed in the center of the other adjacent side of the foam brick 2 in a penetrating manner, a carbon dioxide pipe 7 is fixedly connected in the communicating hole 6, and the carbon dioxide pipes 7 are communicated; the side wall of the carbon dioxide tube 7 is provided with a plurality of diffusion heads 8; the water through holes 5 and the communication holes 6 are perpendicular to each other. The water through holes 5 are arranged towards the flowing direction of the seawater and are used for facilitating the passage of the seawater; all the carbon dioxide tubes 7 are connected in series and then communicated with the carbon dioxide supply tube 3 to supply mixed gas of carbon dioxide and oxygen, and the nitrification and denitrification processes are controlled by controlling the content of oxygen in the mixed gas; the side wall of the part of the carbon dioxide tube 7, which is positioned in the foam brick 2, is communicated with a diffusion head 8, so that mixed gas in the carbon dioxide tube 7 is discharged, and nitrifying and denitrifying bacteria and enteromorpha in the foam brick 2 are conveniently utilized; the water holes 5 are vertical to the carbon dioxide pipe 7, so that the diffusion head 8 can uniformly diffuse the mixed gas.

Furthermore, the diameters of the water through holes 5 and the communication holes 6 are 1/5 of the side length of the foam brick 2, and the four water through holes 5 are positioned in the middle position from the diagonal intersection point to the end point of the foam brick 2; the communication hole 6 is located at the center of the adjacent planes.

In the step B, the foam brick 2 comprises an outer carrier 9, and an inner carrier 10 is fixedly embedded in the inner cavity of the outer carrier 9; the outer side surface of the outer carrier 9 is provided with a plurality of concave circular grooves 11, the concave circular grooves 11 are arranged around the water passing holes 5 and the communication holes 6, and the enteromorpha is planted in the concave circular grooves 11; the upper end and the lower end of the outer carrier 9 are provided with grooves, the inoculation bed 12 is arranged in the grooves, aerobic nitrification and denitrification bacteria are inoculated on the inoculation bed 12, and the outer surface of the outer carrier 9 is provided with a concave circular groove 11 for inoculation of enteromorpha. The enteromorpha grows by utilizing nutrients such as N, P in the mariculture wastewater, and the diffusion head 8 on the carbon dioxide tube 7 is utilized to provide carbon dioxide required by growth; the inoculation bed 12 is inoculated with aerobic nitrification and denitrification bacteria, so that the reaction is convenient, and the nitrification and the denitrification are realized at the same time.

Further, the diameter of the concave circular groove 11 is 1/20 of the side length of the foam brick 2, and the depth of the concave circular groove 11 is 1 cm.

Further, the nitrifying and denitrifying bacteria are domesticated by inoculating the bottom sludge of the mariculture wastewater.

Furthermore, the material of the outer carrier 9 is a foam porous material, the aperture is 50-500 μm, and seawater can permeate through the foam porous material; the inner carrier 10 is made of iron-carbon ceramsite through bonding, is also a porous material, has the aperture of 10-100 mu m, and can be penetrated by seawater.

And E, the density of the fence wall 4 is less than that of the seawater, the bottom end of the fence wall 4 is anchored with the seabed, and the upper part of the fence wall 4 is provided with a floating mark. The whole density of fence wall 4 is less than the sea water, can drift along with the water, carries out the seabed through the iron anchor and fixes, and the buoy sign is established on fence wall 4 upper portion, conveniently fixes a position.

In the step G, the harvesting assembly comprises fixing rods 13 which are fixedly arranged at the upper end and the lower end of the side wall of the enclosure wall 4 respectively, and the two fixing rods 13 are arranged in parallel; two pulleys 14 are symmetrically sleeved on the fixed rod 13, the two pulleys 14 are rotatably connected with the fixed rod 13, and the pulleys 14 on the two fixed rods 13 are correspondingly arranged; a sliding belt 15 is arranged between the two fixing rods 13, the inner surface of the sliding belt 15 is abutted against the outer side surface of the pulley 14, a blade 16 is fixedly connected to the outer side surface of the sliding belt 15, and the blade 16 is in sliding contact with the side wall of the fence wall 4. When the enteromorpha harvesting and planting device is used, the pulley 14 is driven to rotate, the sliding belt 15 drives the blade 16 to scrape along the outer wall of the foam brick 2, the enteromorpha on the outer wall is harvested, the enteromorpha in the concave circular groove 11 is not affected and can be used as a seed to continue growing, and the continuous enteromorpha can be ensured by one-time inoculation; the harvested enteromorpha is collected for other use. The sliding belt 15 of the harvesting assembly covers the whole side face of the retaining wall 4 and can block the seawater from passing through, so that the harvesting assembly can be temporarily installed only when the enteromorpha is harvested, and can be detached after the harvesting is finished, and the purifying effect of the retaining wall 4 is prevented from being influenced.

And G, in the step, arranging fenders 17 around the fence wall 4 when the enteromorpha is harvested. When the enteromorpha is harvested, the sea surface is provided with the enclosure 17, the harvested enteromorpha floats to the water surface, and a salvage ship is adopted to salvage the enteromorpha to the shore; the upper part of the water surface of the enclosure 17 is not less than 0.3m, and the underwater part is not less than 0.5 m.

And E, further optimizing the scheme, wherein in the step E, a plurality of fence walls 4 are arranged. Can carry out interception treatment for multiple times, realizes denitrification treatment on mariculture wastewater, reduces the nitrogen content of discharged seawater, and improves the treatment effect.

The using method comprises the following steps:

firstly, manufacturing a foam brick 2, forming a water through hole 5 and a communicating hole 6, and then embedding a carbon dioxide tube 7 into the communicating hole 6 to ensure that a diffusion head 8 is expanded to the periphery; and then the concave circular groove 11 and the inoculation bed 12 are arranged, and the foam brick 2 is manufactured.

Designing a frame 1 with a proper size according to the seawater condition of a throwing point, and then finishing the design and manufacture according to the design, wherein an iron anchor is arranged at the bottom end of the frame 1 for anchoring, and a buoy mark is arranged at the top end of the frame 1 for later positioning; and finally, embedding the manufactured foam brick 2 into the frame 1, and enabling the water through holes 5 to face the end face of the frame 1 and sequentially connecting the adjacent carbon dioxide tubes 7.

The connected frames 1 are connected in series according to design requirements, finally, nitrifying bacteria and denitrifying bacteria are inoculated in the inoculation bed 12, the frames 1 connected in series are thrown into a preset water area after enteromorpha is inoculated in the concave circular groove 11, and a plurality of fence walls 4 arranged along the flowing direction of seawater are formed.

Connecting the connected carbon dioxide tubes 7 in series and then connecting the carbon dioxide supply tube 3 to supply mixed gas for the diffusion head 8; the reaction of the nitrifying and denitrifying bacteria can be controlled by controlling the content of the ocean gas in the mixed gas, and simultaneously, the carbon dioxide is discharged along the porous foam bricks 2 for the use of the inoculated enteromorpha.

When the quantity of the enteromorpha exceeds a certain quantity, fixing rods 13 are fixedly arranged at the upper end and the lower end of the two sides of the fence wall 4, two pulleys 14 are respectively arranged on the four fixing rods 13, a sliding belt 15 is wound between the four pulleys 14 on the same side, and a blade 16 is fixedly arranged on the outer side surface of the sliding belt 15, so that the blade of the blade 16 is arranged close to the outer surface of the fence wall 4; the sliding belt 15 is driven to rotate through the rotation of the pulley 14, so that the blade 16 is enabled to translate along one direction, and the enteromorpha on the surface of the fence wall 4 is cut to complete the harvest of the enteromorpha; when the enteromorpha is harvested, the surrounding baffles 17 are arranged on the water surface around the fence wall 4, so that the harvested enteromorpha can be conveniently salvaged.

According to the invention, the rapid growth characteristic of green alga enteromorpha in high-nitrogen seawater is fully utilized, the carbon dioxide fixation is realized, simultaneously, the denitrification treatment is carried out on the seawater culture high-nitrogen wastewater, the green alga enteromorpha outbreak caused by the high-nitrogen seawater is controlled in the enteromorpha culture fence wall 4, and the seawater permeating out of the fence wall 4 does not cause the green alga outbreak any more.

The specific embodiment is as follows:

in a certain seawater fish-farming net cage area, the foam brick 2 is placed in a spore inoculation pool (not shown in the figure) by utilizing the technology of the invention, and the ratio of carbon dioxide to air is 1: 9, mixing and introducing into a pool for culturing, uniformly inoculating enteromorpha spores on the foam bricks 2, and assembling the foam bricks 2 and the frame 1 into a fence wall 4 after the seedlings grow to be more than 2 mm. Three enclosure walls 4 are arranged around the periphery of the fish-farming net cage. The water quality comparison between the inner side of the first fence wall 4 and the outer side of the third fence wall 4 is shown in the table, and the total nitrogen water quality index outside the fence wall 4 meets the seawater culture water discharge requirement SC/T9103-2007.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha is characterized by comprising the following steps:

A. manufacturing a frame (1);

B. manufacturing a foam brick (2), and embedding the foam brick (2) into the frame (1);

C. a plurality of foam bricks (2) are communicated through a carbon dioxide supply pipe (3);

D. the frame (1) is sunk into a designated water area and anchored;

E. a plurality of frames (1) are connected in series to form a fence wall (4);

F. growing the enteromorpha;

G. and harvesting components are respectively and temporarily installed on two sides of the fence wall (4) to harvest enteromorpha.

2. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 1, which is characterized by comprising the following steps of: in the step B, four water through holes (5) are formed in one side of the foam brick (2) in a penetrating mode, and the four water through holes (5) are distributed at equal intervals in the circumferential direction; a communicating hole (6) is formed in the center of the other adjacent side of the foam brick (2) in a penetrating mode, carbon dioxide pipes (7) are fixedly connected in the communicating hole (6), and the carbon dioxide pipes (7) are communicated; the side wall of the carbon dioxide tube (7) is provided with a plurality of diffusion heads (8).

3. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 2, characterized by comprising the following steps: the water passing holes (5) are perpendicular to the communicating holes (6).

4. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 3, characterized in that: in the step B, the foam brick (2) comprises an outer carrier (9), and an inner carrier (10) is fixedly embedded in the inner cavity of the outer carrier (9); a plurality of concave circular grooves (11) are formed in the outer side face of the outer carrier (9), the concave circular grooves (11) are arranged on the periphery of the water passing holes (5) and the communication holes (6), and enteromorpha is planted in the concave circular grooves (11).

5. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 4, characterized in that: grooves are formed in the upper end and the lower end of the outer carrier (9), a seed receiving bed (12) is arranged in each groove, and nitrodenitrifying bacteria are inoculated in the seed receiving bed (12).

6. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 1, which is characterized by comprising the following steps of: and E, the density of the fence wall (4) is smaller than that of seawater, the bottom end of the fence wall (4) is anchored with the seabed, and a floating mark is arranged on the upper part of the fence wall (4).

7. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 1, which is characterized by comprising the following steps of: in the step G, the harvesting assembly comprises fixing rods (13) which are fixedly arranged at the upper end and the lower end of the side wall of the fence wall (4) respectively, and the two fixing rods (13) are arranged in parallel; two pulleys (14) are symmetrically sleeved on the fixing rod (13), the two pulleys (14) are rotatably connected with the fixing rod (13), and the pulleys (14) on the two fixing rods (13) are correspondingly arranged; two be provided with between dead lever (13) slip belt (15), the internal surface of slip belt (15) with the lateral surface butt of pulley (14), the lateral surface rigid coupling of slip belt (15) has blade (16), blade (16) with the lateral wall sliding contact of enclosure wall (4).

8. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 1, which is characterized by comprising the following steps of: and G, arranging fenders (17) around the fence wall (4) when the enteromorpha is harvested.

9. The method for treating high-nitrogen-content mariculture wastewater by utilizing enteromorpha according to claim 1, which is characterized by comprising the following steps of: in the step E, a plurality of the fence walls (4) are arranged.