Method for enhancing nitrification and denitrification effects in aquaculture water microbial purifier

Abstract

The invention relates to a method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water, which divides the working time period of the microbial purifier for aquaculture water into a nitrification time period and a denitrification time period, effectively utilizes sediment mixed liquor at the bottom of a biological filler bin, not only can improve the utilization rate of equipment, but also can enhance the nitrification and denitrification effects of the microbial purifier for aquaculture water. The complete process of nitrification and denitrification is realized, and the occupied space of equipment can be reduced; in the nitrification period, the biological filler bin is in an aerobic environment, aerobic microorganisms can perform normal nitrification reaction, and the ammonia content in the biological filler bin is reduced; in the denitrification period, sediment mixed liquid at the bottom layer in the purifier is guided into the biological filler bin and released, the oxygen content in the biological filler bin is reduced, anaerobic microorganisms can be subjected to cultivation and denitrification degradation reaction in the environment, and the sediment mixed liquid can perform necessary carbon source supplementation on the denitrification reaction, so that the denitrification effect is improved. A compensation function is provided for guaranteeing the denitrification process, and the full nitrification and denitrification effects are enhanced.

Description

Technical Field

[0001] The invention relates to a water treatment method, in particular to a method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water. Background Art

[0002] In the process of artificial aquaculture, due to the presence of feed, aquatic animal feces, drug treatment residues and the spread of pathogens, cross-contamination of aquaculture water, especially tail water, occurs, affecting the survival and growth of aquatic animals, reducing the use cycle of aquaculture water and even leading to a shortage of aquaculture water resources. At present, the purification of aquaculture water is still a very complex and difficult problem. The current treatment methods mainly adopt traditional technologies such as graded physical filtration, drug treatment, and plant adsorption. It is difficult to meet the water quality requirements and emission standards for aquaculture water, and it is impossible to avoid various problems such as complex equipment structure, large land occupation space (generally 4-5 treatment pools are required), and difficult engineering construction. Based on the above considerations, it is inevitable to promote the innovation and development of aquaculture water treatment technology by using a water purification equipment that uses microbial treatment methods and occupies a small area, can be easily put into use, and is easy to operate to achieve effective treatment, and continue to upgrade and enhance the treatment function of water purifiers.

[0003] As a water purifier for aquaculture, its design innovations are: the equipment is required to be as exquisite and simple as possible and have sufficient purification functions, so as to significantly reduce and reduce the high capital and labor costs of traditional treatment processes, and to highly organically integrate the traditional complex segmented treatment processes, successfully complete the nitrification and denitrification process in the same compartment of the reactor, and achieve organic degradation and purification of water quality. However, the nitrification and denitrification processes are contradictory to the presence of organic matter, the requirements for the carbon source supply level of the reaction process are contradictory, and the requirements for oxygen-rich and oxygen-deficient environments are also contradictory.

[0004] Since the nitrification reaction of the cultivation, domestication and degradation of microorganisms in the reactor is in an environment with relatively sufficient oxygen and lack of carbon source, the growth activity of anaerobic bacteria is inhibited, the denitrification reaction is seriously blocked, and the entire nitrification and denitrification organic degradation process is disturbed to a certain extent. Under normal circumstances, denitrifying bacteria can only carry out denitrification reaction after consuming the oxygen carried by the internal reflux, so this part of oxygen must also consume carbon source. Therefore, the shortage of denitrifying bacteria and carbon source becomes a constraint factor for the full reaction of nitrification and denitrification. Increasing the biomass of anaerobic bacteria and the necessary carbon source becomes the key factor to overcome this technical shortcoming.

[0005] Therefore, currently, the denitrification part is usually made into an independent treatment device, which is placed on one side of the aquaculture water purifier and connected to each other to denitrify the aquaculture water, which takes up space and is cumbersome to operate. If a purifier can perform both nitrification and denitrification on aquaculture water, it will inevitably improve the utilization rate of the purifier and greatly reduce the space occupied by the equipment. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a method for enhancing the nitrification and denitrification effect in a microbial purifier for aquaculture water. The method for enhancing the nitrification and denitrification effect in a microbial purifier for aquaculture water can utilize the sediment mixed liquid at the bottom of the purifier to switch between nitrification and denitrification reactions in the same purifier, thereby improving the utilization rate of the equipment and reducing the space occupied by the equipment. The technical scheme adopted is as follows: A method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water, characterized by comprising the following steps: (1) Filling the biological filler in the biological filler bin of the microbial purifier for aquaculture water, forming oxygen-rich conditions or anoxic conditions in different time periods, and cultivating and multiplying aerobic microorganisms or anaerobic microorganisms accordingly; (2) The water inlet device introduces aquaculture water into the biological filler bin; (3) Close the sediment drainage device and open the oxygen supply device. The oxygen supply device supplies oxygen to the biological filler bin, so that the biological filler bin is in an aerobic environment. At this time, the aquaculture water microbial purifier is in the nitrification period, and the aerobic microorganisms in the biological filler bin undergo nitrification reaction, reducing the ammonia content in the biological filler bin; (4) After a certain period of time, the oxygen supply device is turned off, and the closed sediment drainage device is opened. The sediment mixed liquid at the bottom of the biological filler bin is drained into the biological filler bin through the sediment drainage device. At this time, the aquaculture water microbial purifier is in the denitrification period, and the biological filler bin is in an anaerobic environment. The anaerobic microorganisms in the biological filler bin undergo denitrification reaction to reduce the nitrogen content in the biological filler bin; (5) The purified aquaculture water is transported to the aquaculture pond for recycling, degradation and reuse; (6) Step (3) and step (4) are performed alternately until the aquaculture water meets the requirements for healthy aquaculture water, and the bottom water of the aquaculture pond is introduced into the purifier for terminal denitrification and efficiency enhancement treatment, and discharged as tail water.

[0007] The above-mentioned water inlet device usually includes a water inlet pipe and a water inlet pump. The water inlet pump is used to send the aquaculture water from the aquaculture pond through the water inlet pipe into the biological filler bin, and the aquaculture water is purified by using the rich and dominant microorganisms cultivated in the biological filler.

[0008] The above-mentioned oxygen supply device usually includes an oxygen supply pump, an oxygen supply pipe and an air distribution plate. The air distribution plate is arranged at the bottom of the biological filling bin. The air outlet of the oxygen supply pipe extends into the biological filling bin and is connected with the air inlet of the air distribution plate. Oxygen is transported to the biological filling bin through the oxygen supply pipe and the air distribution plate.

[0009] The above-mentioned sediment drainage device is used to extract the sediment mixed liquid at the bottom layer of the microbial purifier for aquaculture water and then return it to the biological filler bin and spray it out; it is currently found in the test that due to the high pollution concentration of the sediment mixed liquid at the bottom layer, its redox potential reaches -85mv. The redox potential is an important parameter of the anaerobic reaction process as a manifestation of the material form change of electron transfer and metabolism in the process of microbial metabolism under anaerobic conditions. It can evaluate its anaerobic environment and measure the activity of its anaerobic bacteria, creating an anaerobic environment for denitrification for anaerobic bacteria.

[0010] The above-mentioned microbial purifier for aquaculture water usually includes a control device for automatically or manually controlling the water inlet, water discharge, oxygen supply, sediment drainage, etc. of the purifier; the control device generally adopts a PLC controller, a single-chip microcomputer or a microprocessor.

[0011] Steps (3) and (4) divide the working period of the aquaculture water microbial purifier into a nitrification period and a denitrification period, and effectively utilize the sediment mixed liquid at the bottom of the biological filler bin, which can not only improve the utilization rate of the equipment and realize the complete process of nitrification and denitrification, but also reduce the space occupied by the equipment. During the nitrification period, the sediment drainage device is closed, and the oxygen supply device provides normal oxygen to the biological filling bin, so that the biological filling bin is in an aerobic environment, inhibiting the activity of anaerobic microorganisms. Aerobic microorganisms can carry out normal nitrification reactions, nitrify ammonia nitrogen into nitrite nitrogen and nitrate nitrogen, and reduce the ammonia content in the biological filling bin; during the denitrification period, the oxygen supply device is closed, and the sediment drainage device introduces the sediment mixture at the bottom of the aquaculture water microbial purifier into the biological filling bin of the purifier and releases it. Since the biological filling bin is in an oxygen-deficient environment, the activity of aerobic microorganisms is inhibited, and anaerobic microorganisms can be cultivated and denitrified in this environment. Denitrification degradation reaction, and the sediment mixture can supplement the necessary carbon source for the denitrification reaction, providing a compensation function to ensure the denitrification process, strengthening the full nitrification and denitrification effects, and reducing the nitrogen content in the biological filling bin, realizing the convenience and efficiency of the characteristic setting.

[0012] The certain time in the above step (4) can be switched manually or by the above control device at a fixed time, or it can be switched according to the real-time situation of various indicators of aquaculture water by monitoring whether the various indicators of aquaculture water in the biological filler bin meet the requirements.

[0013] As a preferred embodiment of the present invention, in step (4), when the aquaculture water microbial purifier is in the denitrification period, the sediment mixed liquid is led to the upper part of the biological filler bin, so that the sediment mixed liquid is diffused into the biological filler bin. When draining the sediment mixed liquid at the bottom of the aquaculture water microbial purifier, the sediment mixed liquid is led to the upper part of the biological filler bin through the second sediment conveying pipe, so that the sediment mixed liquid is diffused into the biological filler bin, so that the biological filler bin forms a more closed anaerobic environment. In such an anaerobic environment, the denitrifying bacteria can be secondary proliferated and the organic carbon source can be supplemented, thereby releasing a high concentration of anaerobic bacteria liquid to perform multiple more sufficient mixing reactions with the tail water of the aquaculture pond, further shortening the treatment time of total nitrogen and improving the treatment efficiency of total nitrogen.

[0014] As a further preferred embodiment of the present invention, a balanced liquid distributor is provided in the biological packing bin; in the step (4), when the sediment drainage device drains the sediment mixed liquid at the bottom of the biological packing bin into the biological packing bin, the balanced liquid distributor is used to spray and release the sediment mixed liquid in the biological packing bin, so that the sediment mixed liquid forms a swirling water flow in the biological packing bin, driving the anaerobic microorganisms to rotate. The sediment drainage device extracts the sediment mixed liquid at the bottom of the biological packing bin and drains it back, and sprays and releases it through the balanced liquid distributor, so that the sediment mixed liquid is dispersed in the biological packing bin, so that the sediment mixed liquid forms a swirling water flow in the biological packing bin, and accelerates the diffusion of the sediment mixed liquid in the biological packing bin, thereby accelerating the conversion and formation of the anaerobic environment in the biological packing bin, enhancing the activity of anaerobic microorganisms, and improving the denitrification reaction process of anaerobic microorganisms.

[0015] As a further preferred embodiment of the present invention, the oxygen supply device generally includes an oxygen supply pump, an oxygen supply pipe and an air distribution plate. The air distribution plate is arranged at the bottom of the biological filling bin, and the air outlet of the oxygen supply pipe extends into the biological filling bin and is connected with the air inlet of the air distribution plate, and oxygen is transported to the biological filling bin through the oxygen supply pipe and the air distribution plate; an internal circulation infusion device is provided in the biological filling bin, and the internal circulation infusion device includes an internal circulation pump, an internal circulation liquid inlet pipe, an internal circulation liquid infusion pipe and the balanced liquid distributor, the internal circulation pump is arranged at the top of the biological filling bin, the liquid inlet of the internal circulation liquid inlet pipe is between the microbial filling and the air distribution plate, the liquid outlet of the internal circulation liquid inlet pipe is connected to the liquid inlet of the internal circulation pump, the liquid inlet of the internal circulation liquid infusion pipe is connected to the liquid outlet of the internal circulation pump, and the balanced liquid distributor is arranged under the microbial filling The liquid inlet of the balanced liquid distributor is connected to the liquid outlet of the internal circulation infusion pipe; the sediment drainage device includes a sediment drainage pipe, a sediment drainage pump, a first sediment conveying pipe and a second sediment conveying pipe, the liquid inlet of the sediment drainage pipe is arranged at the bottom of the biological filling bin and below the gas distribution plate, the liquid outlet of the sediment drainage pipe is connected to the liquid inlet of the sediment drainage pump, the sediment drainage pump is provided with a first liquid outlet and a second liquid outlet, the liquid inlet of the sediment conveying pipe is connected to the liquid outlet of the sediment drainage pump, the liquid inlet of the first sediment conveying pipe is connected to the first liquid outlet of the sediment drainage pump, the liquid outlet of the first sediment conveying pipe is communicated with the internal circulation infusion pipe, the liquid inlet of the second sediment conveying pipe is connected to the second liquid outlet of the sediment drainage pump, and the liquid outlet of the second sediment conveying pipe is located at the upper part of the biological filling bin.

[0016] The internal circulation infusion device is used to extract the aquaculture water from the biological filler bin and then pressurize it back into the biological filler bin and spray it out, so that the aquaculture water forms a swirling water flow in the biological filler bin, driving the microbial filler to rotate, thereby enhancing the activity of microorganisms and increasing the nitrification treatment rate of the aquaculture water.

[0017] In a specific solution, a three-way valve may be provided on the internal circulation infusion pipe, wherein the first inlet and outlet of the three-way valve are connected to the internal circulation infusion pipe, and the second inlet of the three-way valve is connected to the liquid outlet of the sediment conveying pipe; according to the time period in which the biological filling bin is located, the opening and closing of the two inlets of the three-way valve are controlled by a control device, so that the liquid can be properly drained.

[0018] As a preferred embodiment of the present invention, in step (6), when the bottom water of the aquaculture pond is discharged as tail water, the bottom water of the aquaculture pond is led to a total nitrogen treatment enhancement device arranged at the tail water discharge end of the aquaculture water microbial purifier; the total nitrogen treatment enhancement device is provided with an anaerobic bacteria proliferation chamber and a plurality of mixed reaction chambers which are sequentially connected, and the anaerobic bacteria proliferation chamber and the plurality of mixed reaction chambers are all fully enclosed structures; the anaerobic bacteria proliferation chamber is filled with biological fillers for proliferating anaerobic microorganisms, the anaerobic bacteria proliferation chamber is introduced into the sediment mixed liquid at the bottom of the biological filler bin, and the tail water is introduced into the first mixed reaction chamber, and the sediment mixed liquid is subjected to secondary denitrification in the anaerobic bacteria proliferation chamber, and then continuously mixed with the tail water in the plurality of mixed reaction chambers.

[0019] The anaerobic bacteria proliferation chamber is filled with biological fillers for the proliferation of denitrifying bacteria. The sediment mixed liquid at the bottom of the aquaculture water purifier is introduced through the anaerobic liquid inlet pipe as a supplement of the organic carbon source, which can enhance the biomass of denitrifying bacteria and provide a composite carbon source to supplement the denitrification reaction; in a fully enclosed anoxic environment, the denitrifying bacteria proliferate and enhance their activity by supplementing the organic carbon source, using nitrate or nitrite as an electron acceptor, reducing it to nitrogen gas through respiration and escaping, releasing high-concentration anaerobic bacteria liquid and reacting with the tail water of the aquaculture pond for multiple times. In this process, the organic matter in the sediment mixed liquid acts as an electron donor, and the nitrate obtains electrons and is reduced to nitrogen gas. At the same time, the organic matter is oxidized to release energy for the use of denitrifying bacteria, which not only shortens the treatment time of total nitrogen, but also effectively improves the total nitrogen treatment in the tail water. Since the organic carbon source is drawn from the sediment mixed liquid at the bottom of the aquaculture water purifier, and the entire total nitrogen treatment efficiency enhancement device is separated by the total nitrogen treatment chamber as a whole, it can be completely set above the aquaculture water purifier without occupying additional land area.

[0020] The above-mentioned multiple mixing reaction chambers are used to carry out a multi-stage mixing reaction between the bacterial liquid after the anaerobic bacteria proliferation reaction and the tail water of aquaculture water. In a fully closed anoxic environment, the tail water and the bacterial liquid are effectively denitrified after the multi-stage mixing reaction to form discharge water that better meets the discharge requirements; and the multiple mixing reaction chambers are connected in sequence to extend the reaction path, so that nitrate or nitrite can be fully reacted.

[0021] As a further preferred embodiment of the present invention, the total nitrogen treatment efficiency enhancement device includes a tailwater inlet pipe, an anaerobic liquid inlet pipe, a tailwater discharge pipe and a total nitrogen treatment chamber; the total nitrogen treatment chamber includes a basin body and a basin cover, the basin cover is covered on the basin body, a plurality of partition plates are provided in the basin body, and the plurality of partition plates divide the basin body into one anaerobic bacteria proliferation chamber and a plurality of mixed reaction chambers; an overflow port or a flow port is provided on each partition plate, and the overflow port and the flow port are arranged in sequence at intervals; the water outlet of the anaerobic liquid inlet pipe is located at the upper part of the anaerobic bacteria proliferation chamber, the water outlet of the tailwater inlet pipe is located at the upper part of the first mixed reaction chamber, and the water inlet of the tailwater discharge pipe is arranged at the upper part of the cavity wall of the last mixed reaction chamber.

[0022] The tail water inlet pipe is connected to the tail water pump of the aquaculture water microbial purifier to drain the tail water to the first mixing reaction chamber.

[0023] The anaerobic liquid inlet pipe is connected to the sediment drainage device of the bottom sediment mixed liquid of the aquaculture water purifier to drain the sediment mixed liquid to the anaerobic bacteria proliferation chamber.

[0024] The basin is generally set as a circle, but it can also be square or other shapes. The total nitrogen treatment chamber is set as a basin structure, which is more suitable for being set on the upper part of the aquaculture water purifier, and is seamless.

[0025] As a further preferred embodiment of the present invention, a plurality of said partition plates are arranged in parallel and vertically in the said basin body, each overflow port is arranged at the upper part of the corresponding partition plate, and each flow port is arranged at the lower part of the corresponding partition plate; adjacent overflow ports and flow ports are staggered from each other in the horizontal direction and in the vertical direction. In order to allow the tail water in the mixed reaction chamber to have more sufficient mixing reaction time, the adjacent overflow ports and flow ports are staggered from each other in the horizontal direction and in the vertical direction, so that after the tail water flows from the overflow port / flow port of the anaerobic bacteria proliferation chamber / previous mixed reaction chamber into the current mixed reaction chamber, there is a certain amount of time for mixing reaction, and then flows from the overflow port of the current mixed reaction chamber to the next mixed reaction chamber.

[0026] Compared with the prior art, the present invention has the following advantages: The method for enhancing nitrification and denitrification effects in the aquaculture water microbial purifier of the present invention divides the working period of the aquaculture water microbial purifier into a nitrification period and a denitrification period, and effectively utilizes the sediment mixed liquid at the bottom of the biological filler bin, which can not only improve the utilization rate of the equipment, realize the complete process of nitrification and denitrification, but also reduce the space occupied by the equipment; in the nitrification period, the biological filler bin is in an aerobic environment, the activity of anaerobic microorganisms is suppressed, the aerobic microorganisms can carry out normal nitrification reaction, and the ammonia content in the biological filler bin is reduced; and in the denitrification period, the sediment mixed liquid at the bottom of the aquaculture water microbial purifier is introduced into the biological filler bin and released, because the biological filler bin is in an anoxic environment, the activity of aerobic microorganisms is suppressed, the anaerobic microorganisms can be cultivated and denitrification degradation reaction is carried out in this environment, and the sediment mixed liquid can supplement the necessary carbon source for the denitrification reaction, provide a compensation function for ensuring the denitrification process, strengthen the full nitrification and denitrification effect, reduce the nitrogen content in the biological filler bin, and realize the convenience and efficiency of the characteristic setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a microbial purifier for aquaculture water and a total nitrogen treatment efficiency enhancement device in a preferred embodiment of the present invention; Figure 2 This is an internal schematic diagram of a total nitrogen treatment efficiency enhancement device in a preferred embodiment of the present invention; Figure 3 It is a schematic diagram of the principle of a preferred embodiment of the present invention; Among them, the labels are: 1-biological filler bin, 101-microorganism filler; 2-water inlet device, 201-water inlet pipe, 202-water inlet pump; 3-tail water delivery device, 301-tail water pumping pipe, 302-tail water delivery pump, 303-tail water input pipe; 4-oxygen supply device, 401-oxygen supply pump, 402-oxygen supply pipe, 403-gas distribution plate; 5-internal circulation infusion device, 501-internal circulation pump, 502-internal circulation inlet pipe, 503-internal circulation infusion pipe, 504- Balanced liquid distributor; 6-sediment drainage device, 601-sediment drainage pipe, 602-sediment drainage pump, 603-first sediment conveying pipe, 604-second sediment conveying pipe, 605-third sediment conveying pipe; 7-control device, 8-tailwater discharge pipe; 9-total nitrogen treatment chamber, 901-basin body, 902-basin cover, 903-anaerobic bacteria proliferation chamber, 9031-anaerobic biological filler, 904-mixing reaction chamber, 905-overflow port, 906-flow port, 10-partition plate. DETAILED DESCRIPTION

[0028] The following is a further description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0029] In this embodiment, a specific embodiment of a microbial purifier for aquaculture water applied to a preferred embodiment of the present invention and a total nitrogen treatment efficiency enhancement device arranged at the tail water discharge end of the microbial purifier for aquaculture water is provided.

[0030] like Figure 1 As shown, the microbial purifier for aquaculture water includes a biological filling bin 1, a water inlet device 2, a tailwater conveying device 3, an oxygen supply device 4, an internal circulation infusion device 5, a sediment drainage device 6 and a control device 7; in this embodiment, the water inlet device 2 includes a water inlet pipe 201 and a water inlet pump 202, one port of the water inlet pipe 201 is connected to the water inlet pump 202, and the other port is located in the middle of the inner cavity of the biological filling bin 1, and the water of the aquaculture pond is sent into the biological filling bin 1 through the water inlet pipe 201; the tailwater conveying device 3 includes a tailwater pumping pipe 301, a tailwater conveying pump 302 and a tailwater input pipe 303, which is used to transport the bottom water of the aquaculture pond as tailwater to the total nitrogen treatment efficiency enhancement device, and one port of the tailwater pumping pipe 301 is located in the middle of the biological filling bin 1. The tailwater inlet pipe 303 has one end connected to the tailwater delivery pump 302, and the other end is in the total nitrogen treatment efficiency enhancement device; the oxygen supply device 4 includes an oxygen supply pump 401, an oxygen supply pipe 402 and an air distribution plate 403, the air distribution plate 403 is arranged at the bottom of the biological filling material bin 1, the air inlet of the oxygen supply pipe 402 is connected to the oxygen supply pump 401, and the air outlet extends into the biological filling material bin 1 and is connected with the air inlet of the air distribution plate 403, and oxygen is delivered to the biological filling material bin 1 through the oxygen supply pipe 402 and the air distribution plate 403; the biological filling material bin 1 is filled with microbial filler 101, and the microbial filler 101 includes aerobic microbial filler and anaerobic microbial filler, and the microbial filler 101 is arranged above the air distribution plate 403.

[0031] like Figure 1As shown, the internal circulation infusion device 5 includes an internal circulation pump 501, an internal circulation liquid inlet pipe 502, an internal circulation liquid infusion pipe 503 and a balanced liquid distributor 504. The internal circulation pump 501 is arranged at the top of the biological filler bin 1, the liquid inlet of the internal circulation liquid inlet pipe 502 is located at the lower part of the microbial filler 101, the liquid outlet of the internal circulation liquid inlet pipe 502 is connected to the liquid inlet of the internal circulation pump 501, the liquid inlet of the internal circulation liquid infusion pipe 503 is connected to the liquid outlet of the internal circulation pump 501, the balanced liquid distributor 504 is arranged between the microbial filler 101 and the gas distribution plate 403, and the liquid inlet of the balanced liquid distributor 504 is connected to the liquid outlet of the internal circulation liquid infusion pipe 503; the sediment drainage device 6 includes a sediment drainage pipe 601, a sediment drainage pump 602, a first sediment conveying pipe 603, a second sediment conveying pipe 604 and The third sediment conveying pipe 605 and the liquid inlet of the sediment drainage pipe 601 are arranged at the bottom of the biological filling bin 1 and below the gas distribution plate 403. The liquid outlet of the sediment drainage pipe 601 is connected with the liquid inlet of the sediment drainage pump 602. The sediment drainage pump 602 is provided with a first liquid outlet, a second liquid outlet and a third liquid outlet. The liquid inlet of the first sediment conveying pipe 603, the liquid inlet of the second sediment conveying pipe 604 and the liquid inlet of the third sediment conveying pipe 605 are respectively connected to the first liquid outlet, the second liquid outlet and the third liquid outlet of the sediment drainage pump 602. The liquid outlet of the first sediment conveying pipe 603 is communicated with the internal circulation infusion pipe 503. The liquid outlet of the second sediment conveying pipe 604 is located at the upper part of the biological filling bin 1. The liquid outlet of the third sediment conveying pipe 605 is located in the total nitrogen treatment efficiency enhancement device.

[0032] The water inlet pump 202, the tailwater delivery pump 302, the oxygen supply pump 401, the internal circulation pump 501, and the sediment drainage pump 602 are all electrically connected to the control device 7. Specifically, the control device 7 can adopt existing technologies such as a PLC controller, a single-chip microcomputer or a microprocessor, which will not be described in detail here. The oxygen supply pump 401, the internal circulation pump 501, and the sediment drainage pump 602 can be automatically or manually controlled by the control device 7 in a segmented time. It is also possible to monitor whether the various index values ​​of aquaculture water in the biological filler bin 1 are met, and switch according to the real-time situation of various indicators of aquaculture water, and divide the working period of the biological filler bin 1 into a nitrification period and a denitrification period.

[0033] like Figure 1 and Figure 2As shown, the total nitrogen treatment efficiency enhancement device is arranged on the upper part of the aquaculture water purifier, and is integrated with the aquaculture water purifier without occupying additional land area; the total nitrogen treatment efficiency enhancement device includes the above-mentioned tail water inlet pipe 303, the third sediment conveying pipe 605 as the anaerobic liquid inlet pipe, the tail water discharge pipe 8 and the total nitrogen treatment bin 9; the total nitrogen treatment bin 9 includes a basin body 901 (generally set to be circular, of course, it can also be square or other shapes) and a basin cover 902, and the basin cover 902 is covered on the basin body 901 to form a fully enclosed structure; in this embodiment, four partition plates 10 are provided in the basin body 901, and the four partition plates 10 divide the basin body 901 into an anaerobic bacteria proliferation chamber 9 03 and four mixing reaction chambers 904, wherein the first and third partition plates 10 are provided with overflow ports 905 at the upper parts, and the second and fourth partition plates 10 are provided with flow ports 906 at the lower parts, and the adjacent overflow ports 905 and flow ports 906 are staggered with each other in the horizontal direction and the vertical direction; the anaerobic bacteria proliferation chamber 903 is filled with anaerobic biological filler 9031; the third sediment conveying pipe 605 serves as an anaerobic liquid input pipe, and its outlet is located at the upper part of the anaerobic bacteria proliferation chamber 903; the outlet of the tail water input pipe 303 is located at the upper part of the first mixing reaction chamber 904, and the water inlet of the tail water discharge pipe 8 is arranged at the upper part of the cavity wall of the last mixing reaction chamber 904.

[0034] Based on the aquaculture water microbial purifier provided in this embodiment, and the total nitrogen treatment efficiency enhancement device arranged at the tail water discharge end of the aquaculture water microbial purifier, the preferred implementation of the method for enhancing the nitrification and denitrification effect in the aquaculture water microbial purifier of the present invention is as follows: Figure 3 As shown, the following steps are included: (1) Filling a microbial filler 101 in a biological filler bin 1 of an aquaculture water microbial purifier, wherein the microbial filler 101 includes a biological filler for culturing and multiplying aerobic microorganisms and a biological filler for anaerobic microorganisms; (2) The water inlet pump 202 delivers the water from the aquaculture pond into the biological filler bin 1 through the water inlet pipe 201; (3) Turn off the sediment drainage pump 602, turn on the oxygen supply pump 401, and the oxygen supply pump 401 delivers oxygen to the biological filler bin 1 through the oxygen supply pipe 402 and the air distribution plate 403, so that the biological filler bin 1 is in an aerobic environment. At this time, the aquaculture water microbial purifier is in the nitrification period, and the aerobic microorganisms in the biological filler bin 1 undergo nitrification reaction to reduce the ammonia content in the biological filler bin 1; in the nitrification period, the internal circulation pump 501 extracts the aquaculture water in the biological filler bin 1 and then pressurizes it back to the biological filler bin 1 and sprays it out, so that the aquaculture water forms a swirling water flow in the biological filler bin 1, driving the microbial filler 101 to rotate, thereby enhancing the activity of microorganisms and improving the nitrification treatment speed of the aquaculture water; (4) After a certain period of time, the oxygen supply pump 401 is turned off, and the sediment drainage pump 602 is turned on and off. The sediment mixture at the bottom of the biological filler bin 1 is drained into the biological filler bin 1 and the upper part of the biological filler bin 1 through the sediment drainage pump 602, so that the sediment mixture covers the upper part of the biological filler bin 1, and is sprayed and released in the biological filler bin 1 through the balanced liquid distributor 504. At this time, the aquaculture water microbial purifier is in the denitrification period; in the denitrification period, the biological filler bin 1 is in a closed anaerobic environment, and the anaerobic microorganisms in the biological filler bin 1 undergo denitrification reaction, thereby reducing the nitrogen content in the biological filler bin 1; at the same time, the denitrifying bacteria can be secondary proliferated and the organic carbon source can be supplemented, thereby releasing a high concentration of anaerobic bacteria liquid to perform multiple and more sufficient mixing reactions with the aquaculture water, further shortening the treatment time of total nitrogen and improving the treatment efficiency of total nitrogen; (5) The purified aquaculture water is transported to the aquaculture pond for recycling, degradation and reuse; (6) Step (3) and step (4) are performed alternately until the aquaculture water meets the requirements for healthy aquaculture water. The water from the bottom of the aquaculture pond is led to the first mixing reaction chamber 904 of the total nitrogen treatment enhancement device arranged at the tail water discharge end of the aquaculture water microbial purifier. The sediment mixed liquid at the bottom of the biological filler bin 1 is then transported to the anaerobic bacteria proliferation chamber 903 through the third sediment transport pipe 605. After the sediment mixed liquid undergoes secondary denitrification in the anaerobic bacteria proliferation chamber 903, it is continuously mixed and reacted with the tail water in multiple mixing reaction chambers 904. The tail water is discharged after the mixing reaction to form qualified discharge water with total nitrogen treatment.

[0035] The method for enhancing nitrification and denitrification effects in the microbial purifier for aquaculture water of the present invention divides the working period of the microbial purifier for aquaculture water into a nitrification period and a denitrification period, and effectively utilizes the sediment mixed liquid at the bottom of the biological filler bin 1, which can not only improve the utilization rate of the equipment and realize the complete process of nitrification and denitrification, but also reduce the space occupied by the equipment. In the nitrification period, the sediment drainage device 6 is closed, and the oxygen supply device 4 supplies oxygen to the biological filler bin 1 normally, so that the biological filler bin 1 is in an aerobic environment, inhibiting the activity of anaerobic microorganisms, and aerobic microorganisms can carry out normal nitrification reactions, nitrifying ammonia nitrogen into nitrite nitrogen and nitrate nitrogen, and reducing the ammonia content in the biological filler bin 1; and in the denitrification period, the oxygen supply device 4 is closed, and the sediment drainage device 6 introduces the sediment mixed liquid at the bottom of the microbial purifier for aquaculture water into the biological filler bin 1 of the purifier, and transports it to the balanced liquid distributor 504 through the internal circulation infusion pipe 503 for spraying. The sediment mixture is released by injection, and the sediment mixture is led to the upper part of the biological filler bin 1 through the second sediment conveying pipe 604, so that the sediment mixture covers the upper part of the biological filler bin 1. Since the biological filler bin 1 forms a more closed anaerobic environment, the activity of aerobic microorganisms is suppressed, and anaerobic microorganisms can be cultivated and denitrified in this environment. Denitrifying bacteria can be reproduced and the organic carbon source can be supplemented, which provides a compensation function to ensure the denitrification process, strengthens the full nitrification and denitrification effect, further shortens the treatment time of total nitrogen, improves the treatment efficiency of total nitrogen, and realizes the convenience and efficiency of the characteristic setting.

[0036] On the other hand, when treating the tail water, the sediment mixed liquid at the bottom of the aquaculture water purifier is introduced through the anaerobic liquid inlet pipe as a supplement of the organic carbon source, which can enhance the biomass of denitrifying bacteria and provide a composite carbon source to supplement the denitrification reaction; in a fully enclosed anoxic environment, the denitrifying bacteria proliferate and enhance their activity by supplementing the organic carbon source, using nitrate or nitrite as an electron acceptor, reducing it to nitrogen gas through respiration and escaping, releasing a high-concentration anaerobic bacterial liquid to fully mix and react with the tail water of the aquaculture pond for multiple times, and connecting through multiple mixing reaction chambers 904 in sequence, extending the reaction path, so that nitrate or nitrite is fully reacted. In this process, in a fully enclosed anoxic environment, the organic matter in the sediment mixed liquid acts as an electron donor, nitrate obtains electrons and is reduced to nitrogen gas, and at the same time, the organic matter is oxidized to release energy for use by denitrifying bacteria, and the tail water and the bacterial liquid are effectively denitrified after a multi-stage mixing reaction, forming a discharge water that is more in line with the discharge requirements, which not only shortens the treatment time of total nitrogen, but also effectively improves the total nitrogen treatment in the tail water. Since the organic carbon source is drawn from the sediment mixed liquid at the bottom of the aquaculture water purifier, and the entire total nitrogen treatment efficiency enhancement device is divided by the total nitrogen treatment chamber 9 as a whole, it can be set above the aquaculture water purifier without occupying additional land area.

[0037] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water, characterized in that The following steps are involved: (1) Filling the biological filler in the biological filler bin of the microbial purifier for aquaculture water, forming oxygen-rich conditions or anoxic conditions in different time periods, and cultivating and multiplying aerobic microorganisms or anaerobic microorganisms accordingly; (2) The water inlet device introduces aquaculture water into the biological filler bin; (3) Close the sediment drainage device and open the oxygen supply device. The oxygen supply device supplies oxygen to the biological filler bin, so that the biological filler bin is in an aerobic environment. At this time, the aquaculture water microbial purifier is in the nitrification period, and the aerobic microorganisms in the biological filler bin undergo nitrification reaction, reducing the ammonia content in the biological filler bin; (4) After a certain period of time, the oxygen supply device is turned off, and the closed sediment drainage device is opened. The sediment mixed liquid at the bottom of the biological filler bin is drained into the biological filler bin through the sediment drainage device. At this time, the aquaculture water microbial purifier is in the denitrification period, and the biological filler bin is in an anaerobic environment. The anaerobic microorganisms in the biological filler bin undergo denitrification reaction to reduce the nitrogen content in the biological filler bin; (5) The purified aquaculture water is transported to the aquaculture pond for recycling, degradation and reuse; (6) Step (3) and step (4) are performed alternately until the aquaculture water meets the requirements for healthy aquaculture water, and the bottom water of the aquaculture pond is introduced into the purifier for terminal denitrification and efficiency enhancement treatment, and discharged as tail water.

2. The method for enhancing nitrification and denitrification effect in a microbial purifier for aquaculture water according to claim 1, characterized in that: In the step (4), when the aquaculture water microbial purifier is in the denitrification period, the sediment mixed liquid is introduced to the upper part of the biological filler bin, so that the sediment mixed liquid is diffused into the biological filler bin.

3. The method for enhancing nitrification and denitrification effect in a microbial purifier for aquaculture water according to claim 2, characterized in that: The biological filling material bin is provided with a balanced liquid distributor; in the step (4), when the sediment drainage device drains the sediment mixed liquid at the bottom layer of the biological filling material bin into the biological filling material bin, the balanced liquid distributor sprays and releases the sediment mixed liquid in the biological filling material bin, so that the sediment mixed liquid forms a swirling water flow in the biological filling material bin, driving the anaerobic microorganisms to rotate.

4. The method for enhancing nitrification and denitrification effect in a microbial purifier for aquaculture water according to claim 3, characterized in that: The oxygen supply device generally includes an oxygen supply pump, an oxygen supply pipe and an air distribution plate. The air distribution plate is arranged at the bottom of the biological filling bin. The air outlet of the oxygen supply pipe extends into the biological filling bin and is connected with the air inlet of the air distribution plate. Oxygen is transported to the biological filling bin through the oxygen supply pipe and the air distribution plate. An internal circulation infusion device is provided in the biological filling bin. The internal circulation infusion device includes an internal circulation pump, an internal circulation liquid inlet pipe, an internal circulation liquid infusion pipe and the balanced liquid distributor. The internal circulation pump is arranged at the top of the biological filling bin. The liquid inlet of the internal circulation liquid inlet pipe is between the microbial filling and the air distribution plate. The liquid outlet of the internal circulation liquid inlet pipe is connected with the liquid inlet of the internal circulation pump. The liquid inlet of the internal circulation liquid infusion pipe is connected with the liquid outlet of the internal circulation pump. The balanced liquid distributor is arranged below the microbial filling. The balanced liquid distributor The liquid inlet is connected with the liquid outlet of the internal circulation infusion pipe; the sediment drainage device includes a sediment drainage pipe, a sediment drainage pump, a first sediment conveying pipe and a second sediment conveying pipe, the liquid inlet of the sediment drainage pipe is arranged at the bottom of the biological filling bin and below the air distribution plate, the liquid outlet of the sediment drainage pipe is connected with the liquid inlet of the sediment drainage pump, the sediment drainage pump is provided with a first liquid outlet and a second liquid outlet, the liquid inlet of the sediment conveying pipe is connected with the liquid outlet of the sediment drainage pump, the liquid inlet of the first sediment conveying pipe is connected with the first liquid outlet of the sediment drainage pump, the liquid outlet of the first sediment conveying pipe is communicated with the internal circulation infusion pipe, the liquid inlet of the second sediment conveying pipe is connected with the second liquid outlet of the sediment drainage pump, and the liquid outlet of the second sediment conveying pipe is located at the upper part of the biological filling bin.

5. The method for enhancing nitrification and denitrification effect in a microbial purifier for aquaculture water according to any one of claims 1 to 4, characterized in that: In the step (6), when the water from the bottom of the aquaculture pond is discharged as tail water, the tail water is led to a total nitrogen treatment enhancement device arranged at the tail water discharge end of the aquaculture water microbial purifier; the total nitrogen treatment enhancement device is provided with an anaerobic bacteria proliferation chamber and a plurality of mixed reaction chambers which are sequentially connected, and the anaerobic bacteria proliferation chamber and the plurality of mixed reaction chambers are all fully enclosed structures; the anaerobic bacteria proliferation chamber is filled with biological fillers for proliferating anaerobic microorganisms, the anaerobic bacteria proliferation chamber is introduced into the sediment mixed liquid at the bottom of the biological filler bin, and the tail water is introduced into the first mixed reaction chamber, and the sediment mixed liquid is subjected to secondary denitrification in the anaerobic bacteria proliferation chamber, and then continuously mixed with the tail water in the plurality of mixed reaction chambers.

6. The method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water according to claim 5, characterized in that: The total nitrogen treatment efficiency enhancement device comprises a tailwater inlet pipe, an anaerobic liquid inlet pipe, a tailwater discharge pipe and a total nitrogen treatment chamber; the total nitrogen treatment chamber comprises a basin body and a basin cover, the basin cover is covered on the basin body, a plurality of partition plates are arranged in the basin body, and the plurality of partition plates divide the basin body into one anaerobic bacteria proliferation chamber and a plurality of mixed reaction chambers; an overflow port or a flow port is opened on each partition plate, and the overflow port and the flow port are arranged in sequence at intervals; the water outlet of the anaerobic liquid inlet pipe is located at the upper part of the anaerobic bacteria proliferation chamber, the water outlet of the tailwater inlet pipe is located at the upper part of the first mixed reaction chamber, and the water inlet of the tailwater discharge pipe is arranged at the upper part of the cavity wall of the last mixed reaction chamber.

7. The method for enhancing nitrification and denitrification effects in a microbial purifier for aquaculture water according to claim 6, characterized in that: A plurality of partition plates are arranged vertically and in parallel in the basin body, each overflow port is arranged at the upper part of the corresponding partition plate, and each flow port is arranged at the lower part of the corresponding partition plate; adjacent overflow ports and flow ports are staggered with each other in the horizontal direction and the vertical direction.

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