Wastewater treatment system

Abstract

The utility model discloses a wastewater treatment system, which is characterized in that sewage to be treated is temporarily stored through an adjusting tank, then is guided into an anaerobic tank for anaerobic reaction and then is guided into a biological reaction tank, and air blown by a filter screen in the biological reaction tank is utilized to carry out nitrification and denitrification reaction through microorganisms, so that the sewage is treated. The method comprises the following steps: reacting wastewater in an oxidation tank, introducing reacted water into a sedimentation tank for sedimentation, introducing supernatant into a discharge tank through a decanter, introducing wastewater precipitated through the discharge tank into a first treatment cavity of the oxidation tank, introducing the wastewater and ozone of an ozone generator into a water inlet shell through a water inlet pipe by using a water pump, and introducing the wastewater into a second treatment cavity of the oxidation tank through a water outlet pipe. The impeller is used for stirring the ozone to form vortex, so that the sewage and ozone are fully mixed and reacted, the contact efficiency between the ozone and supernate of the sewage is improved, and the water treatment efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system. Background Technology

[0002] Industrial wastewater (such as that from chemical, pharmaceutical, and dyeing industries) contains a large amount of recalcitrant organic pollutants. Even after treatment using traditional biochemical processes, these pollutants remain in the effluent, causing the wastewater to fail to meet discharge standards and exhibiting high ecotoxicity, thus posing a serious threat to the aquatic environment. Therefore, effective advanced treatment of industrial wastewater is a common and critical issue currently facing industrial wastewater treatment.

[0003] Ozone oxidation technology is widely used in the advanced treatment of industrial wastewater. However, ozone has low solubility in water, and its own oxidation capacity is weak and selective. Although advanced oxidation technologies such as catalytic ozonation can improve the oxidation capacity of ozone treatment, traditional ozonation technologies still generally suffer from drawbacks such as slow gas-liquid mass transfer rates, uneven contact between water flow and ozone leading to insufficient oxidation capacity, and low ozone utilization efficiency.

[0004] Therefore, improving ozone utilization efficiency and oxidation capacity is a key issue in ozone-based advanced wastewater treatment technology. It is necessary to propose a wastewater treatment system that combines biological treatment with advanced oxidation treatment, which is of great significance for improving water treatment efficiency. Summary of the Invention

[0005] This invention provides a wastewater treatment system to solve the problem that it is difficult to achieve both aeration volume and sedimentation / separation effect in existing aeration and grit removal processes.

[0006] According to one aspect of the present invention, a wastewater treatment system is provided, comprising a flow regulating tank, an anaerobic tank, a biological reaction tank, a sedimentation tank, a discharge tank, and an oxidation tank connected in sequence. The oxidation tank is equipped with a first treatment chamber and a second treatment chamber connected through an overflow hole. A gas-liquid mixer circuit is connected to the first treatment chamber. An ozone generator is externally connected to the gas-liquid mixer. The inlet shell of the gas-liquid mixer is connected to the first treatment chamber through a water pump. An impeller is mounted in the inlet shell through a rotating shaft. The rotating shaft extends to a contact groove in the gas-liquid mixer, and a spiral blade is provided on the rotating shaft in the contact groove.

[0007] Based on the above scheme, preferably, the gas-liquid mixer includes a shell with an internal accommodating cavity, the water inlet shell is installed on the top of the shell, the top of the contact groove is open and spaced apart from the top of the shell, the bottom of the shell is provided with a sedimentation plate with an overflow pipe in the middle, and the storage tank is installed in the shell and located below the overflow pipe.

[0008] Based on the above scheme, the bottom of the storage tank is provided with a conical protrusion, the center of the protrusion is provided with an overflow hole, and wing plates are provided on both sides of the protrusion.

[0009] Preferably, based on the above scheme, the two rotating shafts are arranged in opposite directions.

[0010] Based on the above scheme, preferably, the water pump is connected to the water inlet shell through an inlet pipe, and the inlet pipe is tangentially connected to the water inlet shell.

[0011] Based on the above scheme, preferably, the bioreactor is equipped with a first filter screen and a second filter screen, and a porous filter medium is provided between the first filter screen and the second filter screen.

[0012] Based on the above scheme, preferably, the porous filter medium is porous ceramic particles or synthetic resin particles, and the surface of the porous filter medium is coated with a microbial layer.

[0013] Based on the above scheme, an aerator is preferably installed at the bottom of the bioreactor.

[0014] Based on the above scheme, a preferred embodiment is that the sedimentation tank is equipped with a decanter, and the output end of the decanter is connected to the discharge tank through a diversion pump.

[0015] This invention discloses a wastewater treatment system. Wastewater is temporarily stored in an equalization tank, then introduced into an anaerobic tank for anaerobic reaction. It is then introduced into a biological reactor, where air is collected by a filter and nitrified and denitrified by microorganisms. The reacted water is then poured into a sedimentation tank for settling. The supernatant is then poured into a discharge tank via a decanter. The wastewater, after settling in the discharge tank, enters the first treatment chamber of an oxidation tank. A water pump then mixes the wastewater with ozone from an ozone generator, introducing it into the inlet shell through an inlet pipe. An impeller agitates the ozone, creating a vortex to ensure thorough mixing and reaction between the wastewater and ozone, thereby improving the contact efficiency between the ozone and the supernatant and enhancing water treatment efficiency. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the principle structure of the wastewater treatment system of this utility model;

[0018] Figure 2 This is a cross-sectional view of the gas-liquid mixer of this utility model;

[0019] Figure 3 This is a top view of the gas-liquid mixer of this utility model;

[0020] Explanation of icon numbers:

[0021] 10. Flow regulating tank; 20. Anaerobic tank; 30. Biological reactor; 31. First filter screen; 32. Porous filter media; 33. Second filter screen; 34. Aerator; 40. Sedimentation tank; 41. Decanter; 50. Discharge tank; 60. Oxidation tank; 61. First treatment chamber; 62. Second treatment chamber; 63. Baffle plate; 64. Overflow hole; 70. Gas-liquid mixer; 71. Inlet shell; 72. Water pump; 73. Impeller; 74. Rotating shaft; 75. Contact groove; 76. Spiral blade; 78. Shell; 79. Sedimentation plate; 791. Overflow pipe; 792. Storage tank; 793. Protrusion; 794. Wing plate; 795. Inlet pipe; 80. Ozone generator. Detailed Implementation

[0022] Please see Figure 1 and combined Figure 2 and Figure 3 As shown, this utility model discloses a wastewater treatment system comprising a flow regulating tank 10, an anaerobic tank 20, a biological reactor 30, a sedimentation tank 40, a discharge tank 50, and an oxidation tank 60 connected in sequence. The wastewater to be treated is introduced into the flow regulating tank 10, which controls the flow rate of the treated water to ensure treatment quality. The anaerobic tank 20 is equipped with a stirring rod. In the anaerobic environment, the organic matter in the wastewater is decomposed into short-chain fatty acids, alcohols, and other organic substances through the metabolic action of microorganisms, while also generating a large amount of carbon sources and electron acceptors.

[0023] The biological reactor 30 uses microorganisms to carry out nitrification and denitrification reactions. The biological reactor 30 is equipped with an intermittent aeration unit, which intermittently supplies air to create aerated or non-aerated conditions. Under aerobic conditions, microorganisms take in excess phosphorus and oxidize ammonia nitrogen into nitrate nitrogen. Under non-aeration conditions, i.e. anoxic conditions, nitrate nitrogen is reduced to nitrogen gas by the microorganisms participating in denitrification, thereby removing nitrogen. This method can effectively remove nitrogen and phosphorus by alternating aeration and non-aeration conditions, thereby inducing excess phosphorus intake to carry out nitrification and denitrification.

[0024] The sedimentation tank 40 is used to separate the solids and liquids in the water to be treated from the biological reactor 30. The discharge tank is installed after the sedimentation tank 40, and the supernatant discharged from the sedimentation tank 40 flows into the discharge tank through the decanter 41.

[0025] The oxidation tank 60 of this invention is equipped with a partition 63 that divides it into a first treatment chamber 61 and a second treatment chamber 62. An overflow hole 64 is provided on the upper part of the partition 63. A gas-liquid mixer 70 is connected to the first treatment chamber 61 through a water pump 72. An ozone generator 80 is connected to the gas-liquid mixer 70. The output end of the gas-liquid mixer 70 is connected to the first treatment chamber 61. The input end of the gas-liquid mixer 70 is connected to the water pump 72 through left and right water inlet shells 71. Left and right impellers 73 are installed in the left and right water inlet shells 71 through left and right rotating shafts 74. The left and right rotating shafts 74 extend into the contact groove 75 in the gas-liquid mixer 70. Spiral blades 76 are provided on the left and right rotating shafts 74 in the contact groove 75. The two rotating shafts 74 are arranged in opposite directions.

[0026] Specifically, the gas-liquid mixer 70 of this utility model includes a housing 78 with an internal accommodating cavity, a water inlet shell 71 installed on the top of the housing 78, a contact groove 75 with an open top and spaced apart from the top of the housing 78, a sedimentation plate 79 at the bottom of the housing 78 with an overflow pipe 791 in the middle, and a storage tank 792 installed inside the housing 78 and located below the overflow pipe 791.

[0027] During operation, the ozone generator 80 produces a large amount of ozone gas, which is mixed with the supernatant pumped from the first treatment chamber 61 by the water pump 72 to oxidize and decompose organic matter in the supernatant. Ozone has an oxidizing power about 7 times stronger than chlorine, and not only has excellent bactericidal ability, but also has excellent effects on removing organic matter such as biological oxygen demand (BOD) and chemical oxygen demand (COD).

[0028] The supernatant and ozone gas, after being mixed, are introduced into the left and right water inlet shells 71 and diverted to the left and right water inlet shells 71. The left and right impellers 73 rotate in opposite directions, forming vortices for thorough mixing. Then, the mixture is guided to the contact tank 75. Since the left and right rotating shafts 74 in the contact tank 75 are equipped with spiral blades 76, opposite vortices are formed in the contact tank 75, resulting in violent collisions. This greatly improves the contact efficiency between the supernatant and the sample, effectively decomposes organic matter, and improves the sterilization and deodorization effects. When the water after reaction in the contact tank 75 overflows the top of the contact tank 75, it is introduced into the sedimentation plate 79 for sedimentation. When the water overflows the top of the overflow pipe 791, it is discharged through the overflow pipe 791 and introduced into the storage tank 792 for secondary sedimentation. Finally, it flows back to the first treatment chamber 61 through the bottom of the storage tank 792 and enters the second treatment chamber 62 for output through the overflow hole 64 on the partition 63.

[0029] Furthermore, the present invention also provides a conical protrusion 793 at the bottom of the storage tank 792, an overflow hole in the middle of the protrusion 793, and wing plates 794 on both sides of the protrusion 793. The wing plates 794 can effectively suppress the rise of floating objects or small foreign objects that have settled at the bottom of the storage tank 792.

[0030] It should be noted that, in order to improve the mixing efficiency between ozone and supernatant, the water pump 72 of this utility model is connected to the water inlet shell 71 through the water inlet pipe 795. The water inlet pipe 795 is tangentially connected to the water inlet shell 71, giving the introduced supernatant a greater tangential force and improving its swirling effect.

[0031] The bioreactor 30 of this invention is equipped with a first filter screen 31 and a second filter screen 33, and a porous filter medium 32 is provided between the first filter screen 31 and the second filter screen 33. The porous filter medium 32 is porous ceramic particles or synthetic resin particles, and a microbial layer is attached to the surface of the porous filter medium 32. Furthermore, an aerator 34 is installed at the bottom of the bioreactor 30.

[0032] Based on the above scheme, a preferred embodiment is that the sedimentation tank 40 is equipped with a decanter 41, and the output end of the decanter 41 is connected to the discharge tank 50 through a flow guide pump, that is, the decanter 41 discharges the supernatant water separated from the solid and liquid through sedimentation to the outside.

[0033] This invention discloses a wastewater treatment system. Wastewater is temporarily stored in an equalization tank, then introduced into an anaerobic tank 20 for anaerobic reaction. It is then introduced into a biological reactor 30, where air is collected by a filter screen and microorganisms undergo nitrification and denitrification. The resulting water is then poured into a sedimentation tank 40 for sedimentation. The supernatant is then poured into a discharge tank 50 via a decanter 41. The wastewater, after sedimentation in the discharge tank 50, enters the first treatment chamber 61 of an oxidation tank 60. A water pump 72, along with ozone from an ozone generator 80, is introduced into the inlet shell 71 through an inlet pipe 795. An impeller 73 agitates the ozone, creating a vortex to ensure thorough mixing and reaction between the wastewater and ozone, thereby improving the contact efficiency between the ozone and the supernatant and increasing water treatment efficiency.

Claims

1. A wastewater treatment system, characterized by, The application relates to a sewage treatment device, which comprises sequentially connected flow regulating pools, an anaerobic pool, a biological reaction pool, a sedimentation pool, a discharge pool and an oxidation pool, wherein the oxidation pool is internally provided with a first treatment cavity and a second treatment cavity which are communicated through an overflow hole, a gas-liquid mixer circuit is connected to the first treatment cavity, an ozone generator is externally connected to the gas-liquid mixer, a water inlet shell of an input end of the gas-liquid mixer is connected to the first treatment cavity through a water pump, an impeller is arranged in the water inlet shell through a rotating shaft, the rotating shaft extends to a contact groove in the gas-liquid mixer, and helical blades are arranged on the rotating shaft in the contact groove.

2. A wastewater treatment system as claimed in claim 1, wherein, The gas-liquid mixer comprises a shell body provided with a containing cavity, the water inlet shell is arranged at the top of the shell body, the top of the contact groove is in an open shape and is arranged in a spaced mode with the top of the shell body, the bottom of the shell body is provided with a sedimentation plate, a middle part of the sedimentation plate is provided with an overflow pipe, a storage groove is arranged in the shell body and is arranged below the overflow pipe.

3. A wastewater treatment system as claimed in claim 2, wherein, The bottom of the storage groove is provided with a protrusion in a conical shape, a middle part of the protrusion is provided with an overflow hole, and wing plates are arranged on both sides of the protrusion.

4. A wastewater treatment system as claimed in claim 1, wherein, The rotating directions of the two rotating shafts are arranged in opposite modes.

5. A wastewater treatment system as claimed in claim 1, wherein, The water pump is communicated with the water inlet shell through a water inlet pipe, and the water inlet pipe is tangentially connected with the water inlet shell.

6. A wastewater treatment system as claimed in claim 1, wherein, The biological reaction pool is internally provided with a first filter screen and a second filter screen, and a porous filter medium is arranged between the first filter screen and the second filter screen.

7. A wastewater treatment system as claimed in claim 6, wherein, The porous filter medium is a porous ceramic particle or a synthetic resin particle, and a microorganism layer is attached to the surface of the porous filter medium.

8. A wastewater treatment system as claimed in claim 6, wherein, An aerator is arranged at the bottom of the biological reaction pool.

9. A wastewater treatment system as claimed in claim 1, wherein, A decanter is arranged in the sedimentation pool, and an output end of the decanter is communicated with the discharge pool through a flow guide pump.

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