Energy-saving culture tail water nitrogen and phosphorus removal system

Abstract

The utility model provides an energy-saving culture tail water nitrogen and phosphorus removal system. The energy-saving culture tail water nitrogen and phosphorus removal system comprises a rotary drum microfilter and autotrophic denitrification deep nitrogen and phosphorus removal equipment, an electro-catalysis module is arranged between the water outlet end of the rotary drum microfilter and the water inlet end of the autotrophic denitrification deep nitrogen and phosphorus removal equipment; the electrocatalysis module is configured to form phosphate precipitates in filtered water, the autotrophic denitrification deep nitrogen and phosphorus removal equipment is provided with a second water inlet pipe, the second water inlet pipe is connected with a mixing device, the other end of the mixing device is connected with a first water outlet pipe, and the first water outlet pipe is connected with a second water outlet pipe. The first water outlet pipe is connected to the autotrophic denitrification deep nitrogen and phosphorus removal equipment, and the mixing device is configured to be filled with sulfate reducing bacteria. Nitrogen, phosphorus and sulfur elements in culture tail water can be effectively removed, water area pollution is prevented, and the device has the advantages of being simple in structure, low in operation cost, high in treatment efficiency and the like; the method is suitable for treating various aquaculture wastewater.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture wastewater treatment technology, and in particular to an energy-saving aquaculture tailwater denitrification and phosphorus removal system. Background Technology

[0002] Aquaculture wastewater refers to the wastewater discharged during the aquaculture process. It mainly comes from aquaculture facilities such as ponds, factory aquaculture ponds, and seedling farms. With the development of aquaculture towards large-scale and intensive operations, aquaculture wastewater has become one of the important sources of water pollution. This type of wastewater usually contains high concentrations of nitrogen, phosphorus, organic matter, and suspended solids. If it is discharged directly without effective treatment, it will seriously affect the water quality of the discharge area. Therefore, aquaculture wastewater must be treated before it can be discharged. Existing aquaculture wastewater treatment methods cannot remove sulfur from the wastewater, which will pollute the water quality of the discharge area. Utility Model Content

[0003] This invention provides an energy-saving aquaculture wastewater denitrification and phosphorus removal system that can effectively solve the above-mentioned problems.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an energy-saving aquaculture wastewater denitrification and phosphorus removal system, including: a rotary drum microfilter and an autotrophic denitrification deep denitrification and phosphorus removal device;

[0006] An electrocatalytic module is provided between the outlet of the rotary drum microfilter and the inlet of the autotrophic denitrification deep nitrogen and phosphorus removal equipment; the electrocatalytic module is configured to form phosphate precipitate in the filtered water; the autotrophic denitrification deep nitrogen and phosphorus removal equipment is provided with a second inlet pipe, the second inlet pipe is connected to a mixing device, the other end of the mixing device is connected to a first outlet pipe, the first outlet pipe is connected to the autotrophic denitrification deep nitrogen and phosphorus removal equipment, and the mixing device is configured to be filled with sulfate-reducing bacteria.

[0007] As a further improvement, the rotary drum microfilter is equipped with a rotary drum inside, with a first water inlet pipe connected to the first end of the rotary drum and a sewage outlet pipe connected to the second end of the rotary drum.

[0008] As a further improvement, the rotary drum microfilter is equipped with a backwash pipe, with the inlet end of the backwash pipe located below the rotary drum and the outlet end of the backwash pipe located above the rotary drum.

[0009] As a further improvement, the backwash pipe is equipped with a water pump at the inlet end and multiple nozzles at the outlet end.

[0010] As a further improvement, the autotrophic denitrification deep nitrogen and phosphorus removal equipment is equipped with a tank, a first observation window is provided at the lower end of the outer wall of the tank, a second observation window is provided at the upper end of the outer wall of the tank, a backwash pipe is provided at the bottom of the tank, and a main outlet pipe is provided at the top of the tank.

[0011] As a further improvement, a first connecting pipe connects the rotary drum microfilter to the electrocatalytic module, and a second connecting pipe connects the electrocatalytic module to the autotrophic denitrification deep nitrogen and phosphorus removal equipment.

[0012] The beneficial effects of this utility model are:

[0013] This invention effectively removes nitrogen and phosphorus from aquaculture wastewater, preventing eutrophication and protecting the aquatic ecosystem. The rotary drum microfiltration system removes suspended solids and large particulate impurities, providing optimal water quality for subsequent treatment processes. By filling the autotrophic denitrification and phosphorus removal equipment with anaerobic sulfur-autotrophic bacteria carriers, the aeration process is reduced compared to traditional methods, resulting in energy savings. A mixing device further enhances the denitrification effect by treating the sulfate produced in the autotrophic denitrification and phosphorus removal equipment with sulfate-reducing bacteria under anaerobic conditions, before recirculating it back to the equipment. This process also reduces sulfide emissions. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an energy-saving aquaculture wastewater denitrification and phosphorus removal system according to this utility model.

[0016] In the diagram: 1-Drum microfilter, 11-Main inlet pipe, 12-Drum, 13-First inlet pipe, 14-Sewage pipe, 15-Backwash pipe, 16-Sprayer, 17-Water pump, 2-Electrocatalytic module, 21-First connecting pipe, 22-Second connecting pipe, 3-Autotrophic denitrification deep nitrogen and phosphorus removal equipment, 31-Backwash pipe, 32-Feeding port, 33-Main outlet pipe, 34-First observation window, 35-Second observation window, 36-Baffle plate, 37-Filter screen, 4-Mixing device, 41-Second inlet pipe, 42-First outlet pipe. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] Reference Figure 1 As shown, an energy-saving aquaculture wastewater denitrification and phosphorus removal system includes: a rotary drum microfilter 1 and an autotrophic denitrification deep denitrification and phosphorus removal device 3;

[0020] An electrocatalytic module 2 is installed between the outlet of the rotary drum microfilter 1 and the inlet of the autotrophic denitrification deep nitrogen and phosphorus removal equipment 3. The electrocatalytic module 2 is configured to form phosphate precipitates in the filtered water. The autotrophic denitrification deep nitrogen and phosphorus removal equipment 3 is equipped with a second inlet pipe 41, which is connected to a mixing device 4. The other end of the mixing device 4 is connected to a first outlet pipe 42, which is connected to the autotrophic denitrification deep nitrogen and phosphorus removal equipment 3. The mixing device 4 is filled with sulfate-reducing bacteria, which can effectively remove nitrogen and phosphorus elements from aquaculture tailwater, prevent eutrophication of the water body after discharge, and protect the aquatic ecological environment.

[0021] Furthermore, the rotary drum microfilter 1 is divided into a wastewater zone and a clean water zone by a partition. A main inlet pipe 11 is installed in the wastewater zone, connecting to the outlet of the aquaculture zone to transport wastewater from the aquaculture zone to the wastewater zone. A rotary drum 12 is installed inside the rotary drum 1. A first inlet pipe 13 is connected to the first end of the rotary drum 12, connecting the wastewater zone to the rotary drum 12 and transporting wastewater into the rotary drum 12. A porous screen is installed on the rotary drum 12 for preliminary filtration of the wastewater. A drain pipe 14 is connected to the second end of the rotary drum 12. The drain pipe 14 is used to discharge the waste residue on the drum 12 during backwashing of the drum microfilter 1. The drum microfilter 1 is equipped with a backwash pipe 15. The inlet end of the backwash pipe 15 is located below the drum 12, and the outlet end of the backwash pipe 15 is located above the drum 12. A water pump 17 is installed at the inlet end of the backwash pipe 15, and multiple nozzles 16 are installed at the outlet end of the backwash pipe 15. The filtered water is pumped to the nozzles 16 by the water pump 17, and the nozzles 16 backwash the outer wall of the drum 12 to wash away the waste residue on the drum 12 and discharge it to the outside of the machine through the drain pipe 14.

[0022] Furthermore, the rotary drum microfilter 1 is provided with a first connecting pipe 21 at the bottom of the water purification zone. The first end of the first connecting pipe 21 is connected to the rotary drum microfilter 1, and the second end of the first connecting pipe 21 is connected to the electrocatalytic module 2. The filtered water in the rotary drum microfilter 1 is transported to the electrocatalytic module 2 through the first connecting pipe 21. The electrocatalytic module 2 performs electrocatalytic treatment on the filtered water to produce phosphoric acid, which forms precipitates with calcium, iron, and aluminum in the water to achieve the effect of phosphorus removal. The electrocatalytic module 2 is provided with a second connecting pipe 22 on the other side away from the first connecting pipe 21. The first end of the second connecting pipe 22 is connected to the electrocatalytic module 2, and the second end of the second connecting pipe 22 is connected to the autotrophic denitrification deep denitrification and phosphorus removal equipment 3. The phosphorus-removed water is transported to the autotrophic denitrification deep denitrification and phosphorus removal equipment 3 through the second connecting pipe 22 for denitrification treatment.

[0023] Furthermore, the autotrophic denitrification deep nitrogen and phosphorus removal equipment 3 is equipped with a tank filled with anaerobic sulfur autotrophic bacteria. The anaerobic sulfur autotrophic bacteria are introduced into the tank through the feeding port 32 on the equipment 3, with the feeding height lower than the height of the feeding port 32. The second end of the second connecting pipe 22 is located at the bottom of the tank to ensure sufficient reaction between the phosphorus-removed water and the anaerobic sulfur autotrophic bacteria. Through the denitrification mechanism of the anaerobic sulfur autotrophic bacteria, using reducing sulfur as an electron donor, the bacteria reduce nitrate to nitrogen gas, simultaneously generating sulfate. In the phosphorus removal mechanism, the sulfate generated promotes the chemical precipitation of sulfur. The sulfate ions produced by sulfur oxidation can form precipitates with metal ions and adsorb or co-precipitate phosphate. Sulfate autotrophic bacteria do not directly remove phosphorus, but during denitrification, sulfur is oxidized to sulfuric acid, lowering the local pH, promoting the release of metal ions, and forming precipitates with phosphates. The autotrophic denitrification deep denitrification and phosphorus removal equipment 3 has a second inlet pipe 41 at the bottom of the tank. The second inlet pipe 41 is connected to a mixing device 4, and the other end of the mixing device 4 is connected to a first outlet pipe 42. The first end of the first outlet pipe 42 is connected to the mixing device 4, and the second end is connected to the tank. The mixing device 4 contains sulfate-reducing bacteria to anaerobically convert some of the sulfate formed during denitrification in the tank into SO4. 2- Restore to S 2- It continues to be provided to anaerobic sulfur autotrophs for reuse and to improve the denitrification effect.

[0024] Multiple baffles 36 are staggered inside the tank to increase the reaction time between the filtered water and the anaerobic sulfur autotrophic bacteria, thereby improving the denitrification and phosphorus removal effects. A filter screen 37 is installed near the main outlet pipe 33 to filter the water after it has reacted with the anaerobic sulfur autotrophic bacteria. A first observation window 34 is installed at the lower end of the outer wall of the tank to observe the sulfur autotrophic bacteria at the lower end of the tank and to determine whether to start the backwashing operation of the autotrophic denitrification deep denitrification and phosphorus removal equipment 3 based on the condition of the anaerobic sulfur autotrophic bacteria. A backwashing pipe 31 is installed at the bottom of the tank for backwashing the tank by passing water and air, and waste residue is discharged through the drain port on the tank. A second observation window 35 is installed at the upper end of the outer wall of the tank to observe the condition of the water after it has been treated by the sulfur autotrophic bacteria. A main outlet pipe 33 is installed at the top of the tank to discharge the treated water.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving aquaculture wastewater nitrogen and phosphorus removal system, characterized in that, include: Rotary drum microfiltration unit (1), autotrophic denitrification deep nitrogen and phosphorus removal equipment (3); An electrocatalytic module (2) is provided between the outlet end of the rotary drum microfilter (1) and the inlet end of the autotrophic denitrification deep denitrification and phosphorus removal equipment (3); the electrocatalytic module (2) is configured to form phosphate precipitate in the filtered water; The autotrophic denitrification deep nitrogen and phosphorus removal equipment (3) is provided with a second inlet pipe (41), the second inlet pipe (41) is connected to a mixing device (4), the other end of the mixing device (4) is connected to a first outlet pipe (42), the first outlet pipe (42) is connected to the autotrophic denitrification deep nitrogen and phosphorus removal equipment (3), and the mixing device (4) is configured to be filled with sulfate-reducing bacteria.

2. The energy-saving aquaculture wastewater nitrogen and phosphorus removal system according to claim 1, characterized in that, The rotary drum microfilter (1) is equipped with a rotary drum (12) inside. The first end of the rotary drum (12) is connected to a first water inlet pipe (13), and the second end of the rotary drum (12) is connected to a sewage outlet pipe (14).

3. The energy-saving aquaculture wastewater nitrogen and phosphorus removal system according to claim 2, characterized in that, The rotary drum microfilter (1) is equipped with a backwash pipe (15), with the inlet end of the backwash pipe (15) located below the rotary drum (12) and the outlet end of the backwash pipe (15) located above the rotary drum (12).

4. The energy-saving aquaculture wastewater nitrogen and phosphorus removal system according to claim 3, characterized in that, The backwash pipe (15) is equipped with a water pump (17) at the water inlet end and multiple nozzles (16) at the water outlet end.

5. The energy-saving aquaculture wastewater nitrogen and phosphorus removal system according to claim 1, characterized in that, The autotrophic denitrification deep nitrogen and phosphorus removal equipment (3) is equipped with a tank. The lower end of the outer wall of the tank is provided with a first observation window (34), the upper end of the outer wall of the tank is provided with a second observation window (35), the bottom of the tank is provided with a backwash pipe (31), and the top of the tank is provided with a main outlet pipe (33).

6. The energy-saving aquaculture wastewater nitrogen and phosphorus removal system according to claim 1, characterized in that, A first connecting pipe (21) connects the rotary drum microfilter (1) to the electrocatalytic module (2), and a second connecting pipe (22) connects the electrocatalytic module (2) to the autotrophic denitrification deep nitrogen and phosphorus removal equipment (3).

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