CN111977902A

CN111977902A - COD and ammonia nitrogen processing system in aquaculture wastewater

Info

Publication number: CN111977902A
Application number: CN202010837780.0A
Authority: CN
Inventors: 于守美; 李洪梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2020-11-24

Abstract

The invention discloses a COD (chemical oxygen demand) and ammonia nitrogen treatment system in aquaculture wastewater, which comprises a feeding system, a solid-liquid separation system, a reaction system and an improved system; according to the invention, the screened sample wastewater is heated at a higher temperature, and the operation of heating while stirring and ventilating is kept in the fermentation reaction process, so that on one hand, other microorganisms are killed greatly, uncontrollable risk probability in the reaction process is reduced, and on the other hand, the activity of heating and activating part of anaerobic bacteria is improved, and the gas production efficiency and yield are improved. The invention respectively carries out operations of vacuum inert gas stripping, oxygenation, standing precipitation and the like on the waste water after gas production, so that the waste water can reach the reuse standard after being discharged and collected, the utilization rate of water resources is improved, meanwhile, the waste water does not need to be treated by chemical reaction, and the probability of generating new pollution problem is reduced.

Description

COD and ammonia nitrogen processing system in aquaculture wastewater

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a COD (chemical oxygen demand) and ammonia nitrogen treatment system in aquaculture wastewater.

Background

With the rapid development of national economy, the national demand for energy sources, particularly new energy sources, is increasing day by day, wherein the novel energy not only has better economic cost performance, but also has good ecological environment friendliness, among them, biogas has been attracting attention as one of the representatives of the new energy sources, and there has been a history of over 200 years from the discovery of biogas to the utilization of energy, although biogas itself is an environmentally friendly feature as a new energy source, it is easy to produce a large amount of polluting waste products during the process of producing biogas, for example, the COD index of the wastewater after the biogas is produced by using aquaculture wastewater is too high, which can cause anaerobic ecology of the discharge site, in turn, a large amount of algae is produced, for example, the ammonia nitrogen content of the wastewater can cause the biological chain of the drainage to generate subversive changes and even cause the invasion of foreign species. Moreover, the large discharge of the waste water is not favorable for recycling production and utilization, and is not in line with the advices of environmental protection production.

At present, most of the devices for recycling the culture wastewater to produce the biogas and carry out the post-treatment have the following problems: (1) the entrained waste in the wastewater is not pretreated in the early production stage, such as even dispersion or crushing, so that the problems of accumulation and jamming or insufficient reaction in the screening treatment and the fermentation treatment can occur in the later stage; (2) because a large amount of other microorganisms exist in the aquaculture wastewater, other microorganisms can bring uncontrollable risks and influence the gas production efficiency and yield in the process of producing the biogas by fermenting the aquaculture wastewater, and most of devices only adopt a stacking fermentation mode, so that the reaction efficiency is low; (3) the waste water after gas production is usually discharged directly or after chemical treatment, which can lead to a great waste of water resources on one hand, and on the other hand, the waste water after simple chemical treatment has a low standard rate of discharge standard and may cause new pollution problems.

Therefore, based on the above defects, in the technical field of aquaculture wastewater regeneration treatment, there is still a need for research and improvement on a novel COD and ammonia nitrogen treatment system in aquaculture wastewater, which is also a research focus and a focus in the field at present, and is a starting point and a driving force for completing the present invention.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a COD (chemical oxygen demand) and ammonia nitrogen treatment system in aquaculture wastewater.

In order to achieve the purpose, the invention provides the following technical scheme:

a COD and ammonia nitrogen treatment system in culture wastewater comprises a feeding system, a solid-liquid separation system, a reaction system and an improvement system;

the feeding system comprises a feeding hopper, a groove, a bent pipe, a collecting pipe, a second motor, a second rotating shaft and blades; the lower end of the feed hopper is connected with a tank, a plurality of stirring mechanisms are arranged in the tank, the lower end of the tank is connected with a bent pipe, the lower end of the bent pipe is connected with a collecting pipe, a second motor is connected with a second rotating shaft, the second rotating shaft is connected with a plurality of blades, and the top surfaces of the blades are flush with the bottom surface of the collecting pipe;

the solid-liquid separation system comprises a rotary drum, an opening, a hole, a packing auger, a rotary shaft III, a motor III, a solid material recovery tank, a liquid material recovery tank and a water pipe I; the rotary drum is provided with an opening, the opening is positioned right below the collecting pipe, a plurality of holes are formed in the outer wall of the circumference of the rotary drum, a third rotating shaft is arranged in the rotary drum, a screw conveyor is arranged on the third rotating shaft, two ends of the third rotating shaft are connected with a third motor, a solid material recovery tank and a liquid material recovery tank are respectively arranged below the rotary drum, and the bottom of the liquid material recovery tank is connected with a first water pipe;

the reaction system comprises a reactor, a gas tank I, a gas pipe, a gas hole, a gas pipe II, a gas storage cabinet, a gas outlet, a motor IV, a rotating shaft IV, a stirring rod and a water pipe II; one side of the reactor is communicated with a first water pipe, the top of the reactor is respectively provided with a first air pipe and a second air pipe, one end of the first air pipe is connected with a first gas tank, the other end of the first air pipe is communicated with the first gas pipe, the first gas pipe is provided with a plurality of gas holes, the gas pipe is positioned in the reactor, one end of the second air pipe is connected with a gas storage cabinet, one side of the gas storage cabinet is connected with a gas outlet, a plurality of rotating shafts are arranged in the reactor, the rotating shafts are connected with a plurality of stirring rods, one end of each rotating shaft is connected with a motor IV, the reactor is provided with;

the improved system comprises a U-shaped pipe, a denitrification box, a suction pipe, a pipe network I, a pump machine I, a pipe II, an oxygenation mechanism and a precipitation mechanism; u-shaped pipe one end is connected with water pipe two, and U-shaped pipe other end denitrogenation case is connected, is equipped with a plurality of straw on the denitrogenation case, through pipe network one intercommunication between the straw, and a pipe network end is connected with pump machine one, and denitrogenation case one side is through pipe one and oxygenating mechanism, and oxygenating mechanism is connected with precipitation mechanism through pipe two.

Preferably, the inner walls of the two sides of the groove are provided with a plurality of flanges.

Preferably, the stirring mechanism comprises a motor I, a telescopic rod, a rotating shaft I and a stirrer; the first motor is arranged outside the tank, the telescopic rod is connected with the first motor, the lower end of the telescopic rod is connected with the first rotating shaft, the lower end of the rotating shaft is connected with the stirrer, and the stirrer is located in the tank.

Preferably, one end of the rotary drum is open, and the solid material recovery groove is arranged below the open end of the rotary drum.

Preferably, a heating array is arranged in the liquid material recovery tank, and the heating array consists of a plurality of heating rods connected with a motor.

Preferably, the heating mechanism comprises a heating rod, an electric wire and a generator; the heating rods are uniformly arranged on the reactor, and are electrically connected with the generator through electric wires.

Preferably, the oxygenation mechanism comprises an oxygenation box, a second gas tank, a gas pipe, a second pipe network and a gas outlet hole; the oxygenation box is connected with the denitrification box through a first pipe, one side of the oxygenation box is provided with a second gas tank, the second gas tank is communicated with a second pipe network through a gas supply pipe, the second pipe network is arranged at the bottom in the oxygenation box, and the second pipe network is evenly provided with a plurality of gas outlet holes.

Preferably, the sedimentation mechanism comprises a sedimentation tank, a valve, a pipeline and a pump II; the sedimentation tank is connected with the oxygenation box through a second pipe, the sedimentation tank is connected with a second pump through a pipeline, and a valve is arranged on one side of the sedimentation tank.

Preferably, inert gas is arranged in the first gas tank, and oxygen is arranged in the second gas tank.

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

(1) the waste materials carried in the waste water are fully impacted, crushed and uniformly dispersed through the stirrer and the flange in the feeding system, so that the waste materials are not stacked and blocked in the subsequent solid-liquid separation, and meanwhile, the small-sized waste materials are more uniformly distributed in the waste water without large-amount agglomeration, and the fermentation reaction is further influenced.

(2) According to the invention, the screened sample wastewater is heated at a higher temperature, and the operation of heating while stirring and ventilating is kept in the fermentation reaction process, so that on one hand, other microorganisms are killed greatly, uncontrollable risk probability in the reaction process is reduced, and on the other hand, the activity of heating and activating part of anaerobic bacteria is improved, and the gas production efficiency and yield are improved.

(3) The invention respectively carries out operations of vacuum inert gas stripping, oxygenation, standing precipitation and the like on the waste water after gas production, so that the waste water can reach the reuse standard after being discharged and collected, the utilization rate of water resources is improved, meanwhile, the waste water does not need to be treated by chemical reaction, and the probability of generating new pollution problem is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the feed system of the present invention;

FIG. 3 is a schematic view of the elbow and related components of the invention;

FIG. 4 is a schematic diagram of the structure of a solid-liquid separation system according to the present invention;

FIG. 5 is a schematic structural view of a liquid material recycling tank according to the present invention;

FIG. 6 is a cross-sectional view of a reaction system of the present invention;

FIG. 7 is a schematic diagram of an improved system of the present invention;

fig. 8 is a schematic structural view of an oxygenating mechanism according to the present invention;

FIG. 9 is a schematic structural view of a precipitation mechanism of the present invention;

wherein: the device comprises a feed hopper 1, a tank 101, a flange 102, a first motor 103, an expansion rod 104, a first rotating shaft 105, a stirrer 106, a bent pipe 2, a collecting pipe 201, a second motor 3, a second rotating shaft 301, a blade 302, a rotary drum 4, an opening 401, a hole 402, an auger 403, a third rotating shaft 404, a third motor 405, a solid material recovery tank 5, a liquid material recovery tank 6, a heating array 601, a first water pipe 602, a reactor 7, a first gas tank 8, a first gas pipe 801, a gas pipe 802, a gas hole 803, a second gas pipe 9, a gas storage cabinet 901, a gas outlet 902, a fourth motor 10, a fourth rotating shaft 1001, a stirring rod 1002, a heating rod 11, a wire 1101, a generator 1102, a second water pipe 12, a U-shaped pipe 13, a denitrification tank 14, a suction pipe 15, a first pipe network 1501, a first pump 1502, a first pipe 16, an oxygenation tank 17, a second gas tank 18, a gas supply pipe 1801, a second pipe network 1802, a gas outlet hole 1803.

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.

Referring to fig. 1-9, a system for treating COD and ammonia nitrogen in aquaculture wastewater comprises a feeding system, a solid-liquid separation system, a reaction system, and an improved system;

the feeding system comprises a feeding hopper 1, a groove 101, an elbow pipe 2, a collecting pipe 201, a second motor 3, a second rotating shaft 301 and blades 302; the lower end of the feed hopper 1 is connected with the tank 101, a plurality of stirring mechanisms are arranged in the tank 101, the lower end of the tank 101 is connected with the elbow pipe 2, the lower end of the elbow pipe 2 is connected with the collecting pipe 201, the motor II 3 is connected with the rotating shaft II 301, a plurality of blades 302 are connected on the rotating shaft II 301, and the top surfaces of the blades 302 are flush with the bottom surface of the collecting pipe 201; the inner walls of the groove 101 on both sides are provided with a plurality of flanges 102.

The stirring mechanism comprises a first motor 103, a telescopic rod 104, a first rotating shaft 105 and a stirrer 106; the first motor 103 is arranged outside the groove 101, the telescopic rod 104 is connected with the first motor 103, the lower end of the telescopic rod 104 is connected with the first rotating shaft 105, the lower end of the first rotating shaft 105 is connected with the stirrer 106, and the stirrer 106 is located in the groove 101.

The solid-liquid separation system comprises a rotary drum 4, an opening 401, a hole 402, a packing auger 403, a third rotating shaft 404, a third motor 405, a solid material recovery tank 5, a liquid material recovery tank 6 and a first water pipe 602; an opening 401 is formed in the rotary drum 4, the opening 401 is located right below the collecting pipe 201, a plurality of holes 402 are formed in the circumferential outer wall of the rotary drum 4, a third rotating shaft 404 is arranged in the rotary drum 4, an auger 403 is arranged on the third rotating shaft 404, two ends of the third rotating shaft 404 are connected with a third motor 405, a solid material recovery tank 5 and a liquid material recovery tank 6 are respectively arranged below the rotary drum 4, and the bottom of the liquid material recovery tank 6 is connected with a first water pipe 602; one end of the rotary drum 4 is open, and the solid material recovery groove 5 is arranged close to the lower part of the open end of the rotary drum 4. A heating array 601 is arranged in the liquid material recovery tank 6, and the heating array 601 is composed of a plurality of heating rods connected with a motor.

The reaction system comprises a reactor 7, a first gas tank 8, a first gas pipe 801, a gas pipe 802, a gas hole 803, a second gas pipe 9, a gas storage cabinet 901, a gas outlet 902, a fourth motor 10, a fourth rotating shaft 1001, a stirring rod 1002 and a second water pipe 12; one side of the reactor 7 is communicated with a first water pipe 602, a first air pipe 801 and a second air pipe 9 are respectively arranged at the top of the reactor 7, one end of the first air pipe 801 is connected with a first air tank 8, inert gas is arranged in the first air tank 8, the other end of the first air pipe 801 is communicated with an air conveying pipe 802, a plurality of air holes 803 are formed in the air conveying pipe 802, the air conveying pipe 802 is positioned in the reactor 7, one end of the second air pipe 9 is connected with an air storage cabinet 901, one side of the air storage cabinet 901 is connected with an air outlet 902, a plurality of rotating shafts four 1001 are arranged in the reactor 7, a plurality of stirring rods 1002 are connected to the rotating shafts four, one end of the rotating shafts four 1001 is connected with a motor four 10, a; the heating mechanism comprises a heating rod 11, an electric wire 1101 and a generator 1102; the heating rods 11 are uniformly arranged on the reactor 7, and each heating rod 11 is electrically connected with the generator 1102 through an electric wire 1101.

The improved system comprises a U-shaped pipe 13, a denitrification box 14, a suction pipe 15, a pipe network I1501, a pump machine I1502, a pipe I16, a pipe II 19, an oxygenation mechanism and a precipitation mechanism; 13 one end of U-shaped pipe is connected with two 12 of water pipes, and 13 other ends of U-shaped pipe denitrogenation case 14 are connected, is equipped with a plurality of straw 15 on the denitrogenation case 14, communicates through pipe network 1501 between the straw 15, and pipe network 1501 is terminal to be connected with pump machine 1502, and denitrogenation case 14 one side is through pipe 16 and oxygenating mechanism, and oxygenating mechanism is connected with precipitation mechanism through pipe two 19. The oxygenation mechanism comprises an oxygenation box 17, a second air tank 18, an air supply pipe 1801, a second pipe network 1802 and an air outlet 1803; the oxygenation box 17 is connected with the denitrification box 14 through a first pipe 16, one side of the oxygenation box 17 is provided with a second gas tank 18, and oxygen is arranged in the second gas tank 18. The second air tank 18 is communicated with a second pipe network 1802 through an air supply pipe 1801, the second pipe network 1802 is arranged at the bottom in the oxygenation box 17, and the second pipe network 1802 is evenly provided with a plurality of air outlet holes 1803. The sedimentation mechanism comprises a sedimentation tank 20, a valve 2001, a pipeline 2002 and a second pump 2003; the sedimentation tank 20 is connected with the oxygenation tank 17 through a second pipe 19, the sedimentation tank 20 is connected with a second pump 2003 through a pipe 2002, and a valve 2001 is arranged on one side of the sedimentation tank 20.

The working process of the invention is as follows: the waste water and the mixed waste materials generated by cultivation are poured into the feeding system from the feeding hopper 1, the waste water and the waste materials flow downwards along the groove 101 under the action of gravity, the first motor 103 drives the first rotating shaft 105 to rotate in the process, and then the stirrer 106 is driven to rotate, the stirrer 106 can break up and smash the waste materials in the rotating process so as to further reduce the pressure of subsequent treatment, and the situation that a large amount of large-size waste materials are accumulated to cause the machine to clamp the shell is avoided. The flange 102 may assist the agitator 106 in increasing the break-up effect, for example, the flange 102 may be arranged to further compress the space through which waste material may pass as it passes between the agitator 106 and the inner wall of the tank 101. The length adjustment of the telescoping rod 104 can adjust the operating position of the agitator 106. The waste water flows with small size entrained waste along elbow 2 into header 201. The second motor 3 can control the second rotating shaft 301 to rotate, so as to control the position of the blade 302, when the blade 302 rotates to reach the position right below the collecting pipe 201 and just fits with the collecting pipe, the waste water and waste materials collected in the collecting pipe 201 cannot further flow downwards to enter the solid-liquid separation system, and vice versa if the blade 302 leaves the position. When a batch of waste water and waste materials flow into the rotary drum 4 along the opening 401, the control motor III 405 drives the rotary shaft III 404 to rotate, and meanwhile, the packing auger 403 is respectively connected with the rotary shaft III 404 and the rotary drum 4 to drive the rotary drum 4 to rotate, at the moment, the waste water and waste materials flow downwards along the inclined rotary drum 4 under the action of gravity, the packing auger 403 and the rotary drum 4 which rotate continuously can enable the waste water and waste materials to move towards one end while rolling, in the process, the waste water can flow out through the hole 402 and drip into the liquid material recovery tank 6, and the waste materials move to the port of the rotary drum 4 and fall into the solid material recovery tank 5. The waste water collected in the liquid material recycling tank 6 is heated by the heating array 601, so that the waste water is kept at a higher temperature to accelerate the subsequent fermentation reaction. The waste water with higher temperature is conveyed into the reactor 7 through the water pipe I602, and the generator 1102 supplies energy to the heating rod 11 through the electric wire 1101, so that the heating rod 11 generates high temperature to further improve the reaction temperature, and the fermentation efficiency and the gas production efficiency are accelerated. Meanwhile, the motor IV 10 drives the rotating shaft IV 1001 to rotate, and further drives the stirring rod 1002 to fully stir the wastewater in the reactor 7, so that the reaction efficiency is further improved. The inert gas in the first gas tank 8 is conveyed into the gas conveying pipe 802 through the first gas pipe 801 and then is released through the gas holes 803, so that the gas content in the waste water and the pressure in the reactor 7 are increased, the biogas obtained by reaction is discharged in large quantity from the water and enters the gas storage cabinet 901 along the second gas pipe 9, and the biogas can be taken out through butt joint of the gas outlet 902 if necessary. Accomplish two 12 discharges of waste water flow pipe after the fermentation reaction, it flows into in the U-shaped pipe 13 and enters into denitrogenation case 14, because before the reaction let in the great discharge standard that is not conform to of ammonia nitrogen content that a large amount of inert gas can make waste water, control pump machine 1502 air exhaust operation, make it form evacuation operation to denitrogenation case 14 through pipe network 1501 and straw 15, can make a large amount of inert gas that enter into in the waste water peel off waste water, make ammonia nitrogen content descend by a wide margin, accomplish this processing back waste water and flow into along pipe 16 and oxygenate in the case 17, because the COD index that can make waste water in the reaction before highly is not conform to the discharge standard, the oxidation reduction nature of waste water is strong promptly, need be balanced to it. In the oxygenation box 17, the oxygen in the second air tank 18 is conveyed into the box body through the air pipe 1801, the pipe network II 1802 and the air outlet 1803 in sequence. At this time, the COD index of the wastewater is reduced by oxygen aeration in the wastewater, the wastewater after the treatment flows into the sedimentation tank 20 along the second pipe 19, standing and layering treatment is carried out in the sedimentation tank 20, so that small-particle sediments in the wastewater fall to the bottom of the tank and are absorbed by the second pump 2003 through the pipe 2002, and the water reaching the discharge standard can be discharged from the valve 2001.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a COD and ammonia nitrogen processing system in breed waste water which characterized in that: comprises a feeding system, a solid-liquid separation system, a reaction system and an improved system;

the feeding system comprises a feeding hopper (1), a groove (101), an elbow (2), a collecting pipe (201), a motor II (3), a rotating shaft II (301) and blades (302); the lower end of the feed hopper (1) is connected with the tank (101), a plurality of stirring mechanisms are arranged in the tank (101), the lower end of the tank (101) is connected with the bent pipe (2), the lower end of the bent pipe (2) is connected with the collecting pipe (201), the motor II (3) is connected with the rotating shaft II (301), a plurality of blades (302) are connected onto the rotating shaft II (301), and the top surfaces of the blades (302) are flush with the bottom surface of the collecting pipe (201);

the solid-liquid separation system comprises a rotary drum (4), an opening (401), a hole (402), a packing auger (403), a rotary shaft III (404), a motor III (405), a solid material recovery tank (5), a liquid material recovery tank (6) and a water pipe I (602); the device is characterized in that an opening (401) is formed in the rotary drum (4), the opening (401) is located right below the collecting pipe (201), a plurality of holes (402) are formed in the outer wall of the circumference of the rotary drum (4), a third rotating shaft (404) is arranged in the rotary drum (4), a packing auger (403) is arranged on the third rotating shaft (404), two ends of the third rotating shaft (404) are connected with a third motor (405), a solid material recovery tank (5) and a liquid material recovery tank (6) are respectively arranged below the rotary drum (4), and the bottom of the liquid material recovery tank (6) is connected with a first water pipe (602);

the reaction system comprises a reactor (7), a first gas tank (8), a first gas pipe (801), a gas pipe (802), a gas hole (803), a second gas pipe (9), a gas storage cabinet (901), a gas outlet (902), a fourth motor (10), a fourth rotating shaft (1001), a stirring rod (1002) and a second water pipe (12); one side of the reactor (7) is communicated with a first water pipe (602), a first air pipe (801) and a second air pipe (9) are respectively arranged at the top of the reactor (7), one end of the first air pipe (801) is connected with a first air tank (8), the other end of the first air pipe (801) is communicated with an air conveying pipe (802), a plurality of air holes (803) are formed in the air conveying pipe (802), the air conveying pipe (802) is located inside the reactor (7), one end of the second air pipe (9) is connected with an air storage cabinet (901), one side of the air storage cabinet (901) is connected with an air outlet (902), a plurality of rotating shafts four (1001) are arranged in the reactor (7), a plurality of stirring rods (1002) are connected onto the rotating shafts four (1001), one end of the rotating shafts four (1001) is connected with a fourth motor (10), a heating mechanism is arranged on the reactor (7), and a second water pipe;

the improved system comprises a U-shaped pipe (13), a denitrification box (14), a suction pipe (15), a pipe network I (1501), a pump machine I (1502), a pipe I (16), a pipe II (19), an oxygenation mechanism and a precipitation mechanism; u-shaped pipe (13) one end is connected with water pipe two (12), and U-shaped pipe (13) other end denitrogenation case (14) are connected, is equipped with a plurality of straw (15) on denitrogenation case (14), communicates through pipe network (1501) between straw (15), and pipe network (1501) end is connected with pump machine (1502), and denitrogenation case (14) one side is through pipe one (16) and oxygenating mechanism, and oxygenating mechanism is connected with precipitation mechanism through pipe two (19).

2. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 1, characterized in that: the inner walls of the two sides of the groove (101) are provided with a plurality of flanges (102).

3. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 2, characterized in that: the stirring mechanism comprises a first motor (103), a telescopic rod (104), a first rotating shaft (105) and a stirrer (106); the motor I (103) is arranged on the outer side of the groove (101), the telescopic rod (104) is connected with the motor I (103), the lower end of the telescopic rod (104) is connected with the rotating shaft I (105), the lower end of the rotating shaft I (105) is connected with the stirrer (106), and the stirrer (106) is located in the groove (101).

4. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 3, wherein the system comprises: one end of the rotary drum (4) is open, and the solid material recovery tank (5) is arranged close to the lower part of the open end of the rotary drum (4).

5. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 4, wherein the system comprises: a heating array (601) is arranged in the liquid material recovery tank (6), and the heating array (601) consists of a plurality of heating rods connected with a motor.

6. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 5, wherein the system comprises: the heating mechanism comprises a heating rod (11), an electric wire (1101) and a generator (1102); the heating rods (11) are uniformly arranged on the reactor (7), and each heating rod (11) is electrically connected with the generator (1102) through an electric wire (1101).

7. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 6, wherein the system comprises: the oxygenation mechanism comprises an oxygenation box (17), a second air tank (18), an air supply pipe (1801), a second pipe network (1802) and an air outlet hole (1803); oxygenate case (17) and be connected through pipe one (16) and denitrogenation case (14), oxygenate case (17) one side and be equipped with gas pitcher two (18), gas pitcher two (18) are through air feed pipe (1801) and pipe network two (1802) intercommunication, and pipe network two (1802) set up bottom in oxygenating case (17), has evenly seted up a plurality of venthole (1803) on pipe network two (1802).

8. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 7, wherein the system comprises: the sedimentation mechanism comprises a sedimentation tank (20), a valve (2001), a pipeline (2002) and a second pump (2003); the sedimentation tank (20) is connected with the oxygenation tank (17) through a second pipe (19), the sedimentation tank (20) is connected with a second pump (2003) through a pipeline (2002), and a valve (2001) is arranged on one side of the sedimentation tank (20).

9. The system for treating COD and ammonia nitrogen in aquaculture wastewater according to claim 8, wherein the system comprises: inert gas is arranged in the first gas tank (8), and oxygen is arranged in the second gas tank (18).