Treatment system for reducing total nitrogen in high-concentration organic wastewater

Abstract

The utility model relates to the technical field of water treatment, and discloses a treatment system for reducing total nitrogen in high-concentration organic wastewater, which comprises a reactor, the reactor is provided with a water inlet, a water outlet and an alkali adding pipeline, and is also provided with a circulating mixing aeration device, and the circulating mixing aeration device comprises a gas-water mixed liquid pipeline arranged at the bottom of the reactor; one end of the gas-water mixed liquid pipeline is connected with a compressed air inlet pipeline and a circulating water pipeline, the other side of the gas-water mixed liquid pipeline is provided with a plurality of gas-water mixed liquid outlets, the circulating water pipeline is provided with a lifting pump, and the compressed air inlet pipeline is communicated with an air pump. According to the treatment system for reducing the total nitrogen in the high-concentration organic wastewater, disclosed by the utility model, the mixing of the wastewater and alkali liquor can be promoted through the circulating mixing aeration device, the total nitrogen concentration in sewage can be effectively reduced, meanwhile, the COD (Chemical Oxygen Demand) residual value in the sewage can be reduced, and the continuous improvement of a water environment is realized.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a treatment system for reducing total nitrogen in high-concentration organic wastewater. Background Technology

[0002] High levels of total nitrogen (TNi) are often found in industrial wastewater treatment systems, and TNi is a crucial indicator in wastewater. When TNi emissions from industrial wastewater exceed standards, it severely pollutes the surrounding environment, significantly impacting rivers, lakes, and oceans. It destroys the habitats of aquatic life, reducing or even eliminating rare species. It also harms human health; severe TNi pollution leads to eutrophication, increasing the proliferation of algae and other microorganisms, producing harmful substances such as cyanobacteria, resulting in elevated toxin levels in the water. This threatens health issues such as cancer, encephalitis, gastrointestinal diseases, and the development of the central nervous system in infants. Prolonged discharge and inappropriate treatment can severely pollute surrounding land, impacting ecosystems and people's lives and livelihoods. Therefore, reducing TNi emissions from high-concentration organic wastewater is essential for preventing eutrophication, controlling algal growth, reducing harmful substance formation, and protecting the ecological environment and human health. In typical aerobic wastewater treatment processes, ammonia nitrogen is simply converted into nitrate nitrogen for discharge, but the total nitrogen content is not reduced, and the total nitrogen is not removed. This fails to alleviate environmental problems such as eutrophication of water bodies and therefore does not achieve the desired harmless treatment effect. Utility Model Content

[0003] To address the shortcomings of the existing technology, this invention provides a treatment system for reducing total nitrogen in high-concentration organic wastewater. This system can reduce both total nitrogen content and COD in the wastewater, providing a strong guarantee for subsequent treatment to achieve compliant discharge.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A treatment system for reducing total nitrogen in high-concentration organic wastewater includes a reactor. The reactor is equipped with an inlet, an outlet, an alkali addition pipe, and a circulating mixing aeration device. The circulating mixing aeration device includes an air-water mixture pipe located at the bottom of the reactor. One end of the air-water mixture pipe is connected to a compressed air inlet pipe and a circulating water pipe, and the other side is equipped with several air-water mixture outlets. A booster pump is installed on the circulating water pipe, and the compressed air inlet pipe is connected to an air pump.

[0006] Furthermore, the reactor is an underground circular reinforced concrete structure.

[0007] Furthermore, the reactor is buried at a depth of 1 / 3 to 2 / 3 of its total height.

[0008] Furthermore, the reactor has a diameter of 40m to 48m, a height of 10m to 13m, an inlet with its upper edge 0.5m to 0.7m from the top of the reactor, an inlet length of 2m to 2.5m, and a width of 0.3m to 0.6m, an outlet with its upper edge 0.7m to 0.9m from the top of the reactor, and an outlet length of 2m to 2.5m and a width of 0.3m to 0.6m.

[0009] Preferably, the reactor has a diameter of 44m, a height of 11m, an inlet 0.5m from the top of the reactor, an inlet length of 2m and a width of 0.5m, an outlet 0.7m from the top of the reactor, and an outlet length of 2m and a width of 0.5m.

[0010] Furthermore, the outlet and inlet are arranged at intervals along the circumference of the reactor, and the distance between the outlet and inlet is 1 / 8 to 1 / 4 of the reactor circumference.

[0011] Furthermore, the booster pump is equipped with a booster pump inlet valve, a booster pump outlet valve, and a drain valve.

[0012] Furthermore, the booster pump is a variable frequency single-stage centrifugal booster pump.

[0013] Furthermore, the gas-water mixture outlet direction of the gas-water mixture pipeline is parallel to the bottom wall of the reactor, and the gas-water mixture outlets are arranged in a centrally symmetrical manner along the gas-water mixture pipeline.

[0014] Furthermore, the circulating water pipe is made of carbon steel or 304 stainless steel, the compressed air intake pipe is made of carbon steel or 304 stainless steel, and the air-water mixture pipe is made of fiberglass or stainless steel.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention relates to a system for reducing total nitrogen in high-concentration organic wastewater. Through a circulating mixing aeration device, the system promotes the mixing of wastewater and alkaline solution, effectively reducing the total nitrogen concentration in the wastewater. Simultaneously, it lowers the residual COD value, achieving continuous improvement of the water environment. This system exhibits strong operational stability, high load tolerance, strong shock resistance, large treatment capacity, high efficiency, and low treatment cost, providing a strong guarantee for subsequent treatment processes to achieve compliant discharge. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] Attached reference numerals: 1 – Reactor, 2 – Compressed air inlet pipe, 3 – Water inlet, 4 – Water outlet, 5 – Booster pump outlet valve, 6 – Drain valve, 7 – Booster pump inlet valve, 8 – Booster pump, 9 – Booster pump outlet pipe, 10 – Gas-water mixture outlet, 11 – Gas-water mixture pipe, 12 – Alkali addition pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] A system for reducing total nitrogen in high-concentration organic wastewater includes a reactor 1. The reactor 1 has an inlet 3, an outlet 4, and an alkali addition pipe 12. It also includes a circulating mixing aeration device, which includes a gas-water mixture pipe 11 located at the bottom of the reactor 1. One end of the gas-water mixture pipe 11 is connected to a compressed air inlet pipe 2 and a circulating water pipe 9, while the other end has several gas-water mixture outlets 10. A booster pump 8 is installed on the circulating water pipe 9, and the compressed air inlet pipe 2 is connected to an air pump. Wastewater is added to the reactor 1 through the inlet 3, and alkali solution is added to the reactor through the alkali addition pipe 12. The booster pump 8 pumps the liquid from the reactor 1 into the circulating water pipe 9. The liquid mixes with compressed air entering through the compressed air inlet pipe 2 in the gas-water mixture pipe 11, and then is ejected at high pressure through the gas-water mixture outlets 10, promoting the mixing of wastewater and alkali solution and simultaneously reducing the residual COD value in the wastewater.

[0022] Furthermore, the reactor is an underground, circular, reinforced concrete structure with anti-corrosion and anti-leakage measures, and its processing capacity is 5000 m³. 3 / d~7000m 3 / d, with a preferred processing capacity of 5000m³ 3 / d. Specifically, the reactor volume is 15000m³. 3 ~20000m 3 The reactor has a diameter of 40m to 48m and a height of 10m to 13m. In one specific embodiment, the reactor has a diameter of 44m and a height of 11m.

[0023] Further, the buried depth of the reactor accounts for 1 / 3 to 2 / 3 of the total height, preferably 1 / 2. The upper edge of the inlet is 0.5m to 0.7m from the top of the reactor, the inlet length is 2m to 2.5m, and the width is 0.3m to 0.6m. The upper edge of the outlet is 0.7m to 0.9m from the top of the reactor, the outlet length is 2m to 2.5m, and the width is 0.3m to 0.6m. In one specific embodiment, the upper edge of the inlet is 0.5m from the top of the reactor, the inlet length is 2m, and the width is 0.5m. The upper edge of the outlet is 0.7m from the top of the reactor, the outlet length is 2m, and the width is 0.5m. Preferably, the outlet and inlet are arranged at intervals along the circumference of the reactor, and the interval between the outlet and inlet is 1 / 8 to 1 / 4 of the reactor circumference, preferably 1 / 4.

[0024] Preferably, the booster pump 8 is equipped with a booster pump inlet valve 7, a booster pump outlet valve 5, and a drain valve 6. Preferably, the booster pump 8 is a variable frequency single-stage centrifugal booster pump with a head of 15m to 20m, preferably 20m. Preferably, the diameter of the booster pump inlet valve 7 and the booster pump outlet valve 5 is DN0.5m to 0.8m, preferably 0.6m. The drain valve 6 is a ball valve, preferably made of stainless steel, with a diameter of DN0.025m to 0.05m, preferably 0.032m. The circulating water pipe 9 is made of carbon steel or 304 stainless steel, preferably 304 stainless steel. The diameter of the circulating water pipe 9 is the same as the diameter of the booster pump inlet valve 7 and the booster pump outlet valve 5.

[0025] Preferably, the compressed air intake pipe 2 is made of carbon steel or 304 stainless steel, preferably 304 stainless steel; the diameter is DN0.2m~0.4m, preferably 0.3m; the pressure of the compressed air intake pipe 2 is controlled at 95Kpa~100Kpa, preferably 98Kpa.

[0026] Furthermore, the gas-water mixture pipeline 11 is made of fiberglass or stainless steel, preferably fiberglass. The gas-water mixture pipeline is connected to the circulating water pipeline and the compressed air inlet pipeline via flanges. The compressed air inlet pipeline is located directly above or to the side of the gas-water mixture pipeline, preferably directly above. The end of the gas-water mixture pipeline is 1m to 2m from the side wall of the reactor, preferably 1m. The gas-water mixture outlet direction of the gas-water mixture pipeline is parallel to the bottom wall of the reactor, and the gas-water mixture outlets are arranged symmetrically along the gas-water mixture pipeline. Further, the gas-water mixture outlet direction is not parallel to the water outlet direction.

[0027] Furthermore, the reactor is equipped with a temperature sensor, a pH sensor, and a dissolved oxygen sensor to monitor the temperature, pH value, and dissolved oxygen content within the reactor. During operation, the liquid temperature inside the reactor is controlled within a range of 30℃ to 40℃, preferably 35℃; the reactor pH value is controlled within a range of 7.5 to 8.5, preferably 8.0; and the reactor dissolved oxygen value is controlled within a range of 0.3 mg / L to 0.8 mg / L, preferably 0.5 mg / L.

[0028] In operation, wastewater is added to reactor 1 through inlet 3, and alkali solution is added to the reactor through alkali addition pipe 12. First, open the inlet valve 7 of the booster pump and the vent valve 6. After venting and removing all air, close the vent valve 6 and start the booster pump 8. After starting, slowly open the outlet valve 5 of the booster pump until the current and pressure stabilize. Adjust the booster pump frequency converter according to the operating conditions. Turn on the air pump, and compressed air enters through the compressed air inlet pipe 2. The liquid and compressed air mix in the air-water mixing pipe 11 at the bottom of the reactor and are then sprayed out at high pressure from the air-water mixture outlet 10, promoting the mixing of wastewater and alkali solution and reducing the residual COD value in the wastewater. The treated wastewater flows out by gravity from the outlet and enters the subsequent treatment unit for further processing.

[0029] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A treatment system for reducing total nitrogen in high-concentration organic wastewater, characterized in that: The reactor includes an inlet, an outlet, and an alkali addition pipe. It also includes a circulating mixing aeration device, which includes an air-water mixture pipe located at the bottom of the reactor. One end of the air-water mixture pipe is connected to a compressed air inlet pipe and a circulating water pipe, and the other side has several air-water mixture outlets. A booster pump is installed on the circulating water pipe, and the compressed air inlet pipe is connected to an air pump.

2. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 1, characterized in that: The reactor is an underground circular reinforced concrete structure.

3. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 2, characterized in that: The reactor is buried at a depth of 1 / 3 to 2 / 3 of its total height.

4. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 2, characterized in that: The reactor has a diameter of 40m to 48m and a height of 10m to 13m. The upper edge of the inlet is 0.5m to 0.7m from the top of the reactor, the inlet is 2m to 2.5m long and 0.3m to 0.6m wide, the upper edge of the outlet is 0.7m to 0.9m from the top of the reactor, and the outlet is 2m to 2.5m long and 0.3m to 0.6m wide.

5. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 4, characterized in that: The reactor has a diameter of 44m and a height of 11m. The upper edge of the inlet is 0.5m from the top of the reactor, and the inlet is 2m long and 0.5m wide. The upper edge of the outlet is 0.7m from the top of the reactor, and the outlet is 2m long and 0.5m wide.

6. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 2, characterized in that: The outlet and inlet are arranged at intervals along the circumference of the reactor, and the distance between the outlet and inlet is 1 / 8 to 1 / 4 of the reactor circumference.

7. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 1, characterized in that: The booster pump is equipped with a booster pump inlet valve, a booster pump outlet valve, and a drain valve.

8. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 7, characterized in that: The booster pump is a variable frequency single-stage centrifugal booster pump.

9. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 1, characterized in that: The gas-water mixture outlet direction of the gas-water mixture pipeline is parallel to the bottom wall of the reactor, and the gas-water mixture outlets are arranged in a centrally symmetrical manner along the gas-water mixture pipeline.

10. The treatment system for reducing total nitrogen in high-concentration organic wastewater according to claim 1, characterized in that: The circulating water pipe is made of carbon steel or 304 stainless steel, the compressed air intake pipe is made of carbon steel or 304 stainless steel, and the air-water mixture pipe is made of fiberglass or stainless steel.

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