Wastewater treatment system

Abstract

The utility model discloses a wastewater treatment system. The system comprises a liquid inlet pump communicated with a wastewater pipeline; the primary water treatment assembly is communicated with the liquid inlet pump, comprises a plurality of primary reaction tanks which are communicated in sequence, and is used for carrying out aeration oxidation, primary coagulation and primary flocculation on the wastewater to form primary treatment liquid; the first precipitation part is communicated with the primary water treatment assembly and is used for carrying out primary precipitation on the primary treatment liquid; the secondary water treatment assembly is communicated with the first precipitation part, comprises a plurality of secondary reaction tanks which are communicated in sequence, and is used for carrying out electrocatalytic oxidation, secondary coagulation and secondary flocculation on the primarily precipitated liquid to form secondarily treated liquid; the second precipitation part is communicated with the secondary water treatment assembly and is used for carrying out secondary precipitation on the secondary treatment liquid; and the fan is respectively communicated with the primary water treatment assembly and the secondary water treatment assembly and is used for supplying air. According to the system, the process is optimized, so that the energy consumption is low, the dosage of chemicals is small, and the process cost is saved.

Description

Technical Field

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

[0002] The mineral processing industry is a key link in mineral resource development. With the growth of global demand for mineral resources, mainly driven by the demand for new energy (lithium, cobalt, rare earth), precious metals (gold, silver) and base metals (copper, zinc, iron), environmental protection requirements are increasing and environmental protection costs are high. Investment in wastewater treatment facilities accounts for 10% to 30% of the total cost of mineral processing.

[0003] The main types of pollutants in mineral processing wastewater include: heavy metal ions (Pb). 2+ Zn 2+ Cu 2+ Cd 2+ Chemical reagents: flotation agents (xanthate, fatty acids), frothers (pine oil). The challenges in treatment are: a wide variety of pollutants with large concentration fluctuations; some reagents (such as cyanide and organic flotation agents) are highly toxic and difficult to degrade; metals require stabilization treatment to avoid secondary pollution.

[0004] Currently, the mainstream processing techniques include the following methods:

[0005] The first method is heavy metal removal. Examples include: hydroxide precipitation: adjusting the pH to alkaline to form insoluble hydroxides (such as Cu(OH)2). sulfide precipitation: adding Na2S or FeS to form more stable metal sulfides (such as CdS), suitable for low-concentration heavy metals. Ion exchange: using resins to selectively adsorb heavy metal ions, suitable for deep treatment of low-concentration wastewater, but costly. Adsorption: using adsorbents such as activated carbon, bentonite, and biochar to remove trace amounts of heavy metals and organic matter.

[0006] The second method is the treatment of organic pollutants. For example, the Fenton process (H₂O₂ + Fe²⁺) 2+ Ozone oxidation generates hydroxyl radicals (·OH) to degrade organic flotation agents. Ozone oxidation directly oxidizes or catalytically oxidizes and decomposes cyanides, xanthates, etc. Biological treatment: An anaerobic-aerobic combined process; for organics with good biodegradability (such as some fatty acid reagents), pretreatment is required to reduce toxicity.

[0007] The third type is advanced treatment and reuse. Examples include membrane separation technologies such as reverse osmosis (RO) and nanofiltration (NF): these desalinate and remove residual pollutants, and the produced water can be reused in mineral processing. The advantage is high-quality effluent, but membrane fouling and operating costs need to be controlled. Constructed wetlands further purify wastewater using the synergistic effect of plants and microorganisms, suitable for the ecological treatment of low-pollution effluent.

[0008] The fourth type is the treatment of special pollutants. For example: cyanide treatment: ① Alkaline chlorination method, adding Cl2 or NaClO to oxidize cyanide into CO2 and N2 (pH > 10 needs to be controlled). ② Natural degradation method, long-term exposure of tailings ponds to sunlight, utilizing ultraviolet light and microbial degradation. Arsenic treatment: co-precipitation with iron salts, adding FeSO4 to generate stable FeAsO4 precipitate.

[0009] Typical process combinations include: 1. Conventional process (suitable for wastewater mainly composed of heavy metals and suspended solids): equalization tank → neutralization sedimentation → coagulation sedimentation → filtration → disinfection → discharge / reuse. 2. Cyanide / organic wastewater process: cyanide removal (alkaline chlorination) → coagulation sedimentation → activated carbon adsorption → biological treatment → membrane treatment. 3. Zero discharge process: pretreatment → membrane concentration → evaporation crystallization (suitable for water-scarce areas, but with high energy consumption).

[0010] However, all of the above processes have high energy consumption, large amounts of treatment agents, and high costs, and also pose a risk of secondary pollution. Summary of the Invention

[0011] This invention provides a wastewater treatment system to optimize water treatment processes and reduce energy consumption and costs.

[0012] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0013] This utility model provides a wastewater treatment system, including:

[0014] An inlet pump, wherein the inlet of the inlet pump is connected to a wastewater pipeline;

[0015] The preliminary water treatment component is connected to the inlet pump and includes multiple preliminary reaction tanks connected in sequence for sequentially performing aeration oxidation, preliminary coagulation and preliminary flocculation on the wastewater to form a preliminary treated liquid.

[0016] The first sedimentation section is connected to the preliminary water treatment component for preliminary sedimentation of the preliminary treated liquid.

[0017] The secondary water treatment component is connected to the first sedimentation section and includes multiple secondary reaction tanks connected in sequence for electrocatalytic oxidation, secondary coagulation and secondary flocculation of the liquid after preliminary sedimentation in sequence, thereby forming a secondary treated liquid.

[0018] The second sedimentation section is connected to the secondary water treatment component for secondary sedimentation of the secondary treated liquid.

[0019] A blower is connected to both the primary water treatment component and the secondary water treatment component for supplying air.

[0020] Preferably, the preliminary water treatment component includes:

[0021] The Fenton aeration oxidation unit is connected to the outlet of the inlet pump for aeration oxidation of the wastewater.

[0022] The first coagulation section is connected to the Fenton aeration oxidation section for preliminary coagulation of the liquid after aeration oxidation.

[0023] The first flocculation section is connected to the first coagulation section for preliminary flocculation of the liquid after preliminary coagulation.

[0024] Preferably, the Fenton explosion oxidation section includes:

[0025] Multiple Fenton gas reaction tanks are connected sequentially, and the first Fenton gas reaction tank is connected to the outlet of the liquid inlet pump.

[0026] Multiple oxidizing agent tanks, each containing a different oxidizing agent, and each connected to the first Fenton explosion reaction tank;

[0027] The blower is connected to each of the Fenton aeration reaction tanks so that, under aeration, multiple oxidants and wastewater are mixed and then passed through multiple Fenton aeration reaction tanks to undergo multiple aeration reactions, thereby forming an aeration reaction liquid.

[0028] Preferably, the first coagulation section includes:

[0029] The first coagulation reaction tank is connected to the last of the plurality of Fenton explosion reaction tanks;

[0030] Multiple coagulant tanks, each containing a different coagulant, and each connected to the first coagulation reaction tank;

[0031] The blower is connected to the first coagulation reaction tank so that, under aeration, a coagulation reaction is carried out by mixing various coagulants with the aeration reaction liquid to form a coagulation reaction liquid.

[0032] Preferably, the first flocculation section includes:

[0033] The first flocculation reaction tank is connected to the first coagulation reaction tank;

[0034] A flocculant tank, which contains flocculant and is connected to the first flocculation reaction tank;

[0035] The fan is connected to the first flocculation reaction tank so that, under aeration, the flocculant and the coagulation reaction liquid are mixed to carry out a flocculation reaction, thereby forming a flocculation reaction liquid.

[0036] Preferably, the secondary water treatment component includes:

[0037] An electrocatalytic oxidation unit is connected to the first precipitation unit for electrocatalytic oxidation of the liquid after preliminary precipitation.

[0038] The second coagulation section is connected to the electrocatalytic oxidation section to perform secondary coagulation on the liquid after electrocatalytic oxidation.

[0039] The second flocculation section is connected to the second coagulation section for secondary flocculation of the liquid after secondary coagulation.

[0040] Preferably, the electrocatalytic oxidation unit includes:

[0041] A transfer tank, connected to the first sedimentation section, is used to temporarily store the liquid after preliminary sedimentation.

[0042] A catalyst tank, containing a catalyst and connected to the transfer tank, is used to mix the catalyst with the liquid after initial precipitation.

[0043] An electrocatalytic oxidation tank is connected to the transfer tank, and an electrode module is placed in the electrocatalytic oxidation tank for electrocatalytic oxidation of the mixed liquid to form an electrocatalytic reaction liquid.

[0044] A rectifier, connected to the electrode module via a cable, is used to provide current.

[0045] Preferably, the second coagulation section includes:

[0046] The second coagulation reaction tank is connected to the electrocatalytic oxidation tank, and the second coagulation reaction tank is connected to at least one of the coagulation agent tanks respectively;

[0047] The thallium removal agent tank contains thallium removal agent and is connected to the second coagulation reaction tank;

[0048] The blower is connected to the second coagulation reaction tank so that, under aeration, at least one coagulant, a thallium removal agent, and the electrocatalytic reaction liquid are mixed to carry out a secondary coagulation reaction, thereby forming a secondary coagulation reaction liquid.

[0049] Preferably, the second flocculation section includes:

[0050] The second flocculation reaction tank is connected to the second coagulation reaction tank, and the second flocculation reaction tank is connected to the flocculant tank.

[0051] The fan is connected to the second flocculation reaction tank so that, under aeration, the flocculant and the secondary coagulation reaction liquid are mixed to carry out a secondary flocculation reaction, thereby forming a secondary flocculation reaction liquid.

[0052] Preferably, the first precipitation section includes:

[0053] A sedimentation tank, connected to the preliminary water treatment assembly, is used to receive the pre-treated liquid;

[0054] Multiple inclined tubes are arranged side by side in the sedimentation tank for inclined tube sedimentation of the pre-treated liquid;

[0055] A collection tank, disposed within the sedimentation tank and located below the plurality of inclined tubes, is used to collect impurities;

[0056] The second precipitation section has the same structure as the first precipitation section.

[0057] Compared with the prior art, the advantages of this utility model are as follows:

[0058] The wastewater treatment system of this utility model, in practical use, connects to a wastewater pipeline via an inlet pump, thereby introducing wastewater into the entire system. After entering the system, the wastewater sequentially passes through a preliminary water treatment component, a first sedimentation section, a secondary water treatment component, and a second sedimentation section, undergoing preliminary treatment, preliminary sedimentation, secondary treatment, and secondary sedimentation processes to complete the wastewater treatment. A blower is connected to both the preliminary and secondary water treatment components to supply air during the water treatment process, ensuring its normal operation. Therefore, it not only has low energy consumption (only 60% of traditional processes), but also uses less reagent for aeration and electrocatalytic oxidation (only 20% of traditional processes). Furthermore, it results in low wastewater discharge (90% water reuse) and avoids the risk of secondary pollution. Attached Figure Description

[0059] Figure 1 A schematic diagram of a wastewater treatment system provided in an embodiment of this utility model;

[0060] Figure 2 A top view of a wastewater treatment system provided in an embodiment of this utility model;

[0061] Figure 3 This is a schematic diagram of the structure of the Fenton explosion oxidation section in an embodiment of this utility model;

[0062] Figure 4 This is a schematic diagram of the structure of the first concrete section in an embodiment of this utility model;

[0063] Figure 5 This is a schematic diagram of the structure of the first flocculation section in an embodiment of this utility model;

[0064] Figure 6 This is a schematic diagram of the electrocatalytic oxidation section in an embodiment of the present invention;

[0065] Figure 7 This is a schematic diagram of the structure of the second coagulation section in an embodiment of the present invention;

[0066] Figure 8 This is a schematic diagram of the structure of the second flocculation section in an embodiment of this utility model.

[0067] In the accompanying drawings, the reference numerals indicate:

[0068] 1. Inlet pump;

[0069] 2. Preliminary water treatment components; 21. Fenton aeration oxidation section; 22. First coagulation section; 23. First flocculation section; 211. Fenton aeration reaction tank; 212. Oxidizing agent tank; 221. First coagulation reaction tank; 222. Coagulant tank; 231. First flocculation reaction tank; 232. Flocculation agent tank;

[0070] 3. First sedimentation section; 31. Sedimentation tank; 32. Inclined tube; 33. Collection tank;

[0071] 4. Secondary water treatment components; 41. Electrocatalytic oxidation section; 42. Second coagulation section; 43. Second flocculation section; 411. Transfer tank; 412. Catalyst tank; 413. Electrocatalytic oxidation tank; 414. Rectifier; 415. Cable; 4131. Electrode module; 421. Second coagulation reaction tank; 422. Thallium removal agent tank; 431. Second flocculation reaction tank;

[0072] 5. Second sedimentation section; 6. Blower; 7. Recovery section. Detailed Implementation

[0073] To make the objectives, features, and advantages of this utility model more apparent and understandable, 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 some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0074] This utility model aims to address the problems of high energy consumption, large dosage of treatment agents, high cost, and risk of secondary pollution in mineral processing wastewater treatment processes by proposing an integrated wastewater treatment system with optimized processes. This system sequentially performs preliminary treatment, preliminary sedimentation, secondary treatment, and secondary sedimentation on the wastewater, thereby completing the integrated treatment of the wastewater.

[0075] In this embodiment, the above-mentioned treatment process is completed through oxidation, coagulation, flocculation, inclined tube precipitation, and electrocatalytic oxidation. The principle of each process is as follows:

[0076] Oxidation: Generates hydroxyl radicals (·OH) that degrade organic flotation agents.

[0077] Coagulation: through coagulants (such as Al) 3+ Fe 3+ Hydrolysis generates positively charged ions, which neutralize the negative charge on the surface of suspended particles, reduce the repulsive force between particles, and promote their collision and aggregation.

[0078] Flocculation: The long-chain structure of polymeric flocculants (such as PAM) can adsorb multiple particles simultaneously, forming a "particle-polymer-particle" network structure, which accelerates floc growth.

[0079] Inclined tube sedimentation: Inclined tube sedimentation is a highly efficient sedimentation technology that significantly improves the settling efficiency of suspended solids and flocs by increasing the sedimentation area and optimizing water flow conditions.

[0080] Electrocatalytic oxidation: ① Direct oxidation or catalytic oxidation to decompose toxic and difficult-to-decompose reagents such as cyanide and xanthate. ② Electrochemical oxidation to decompose heavy metal ions Pb. 2+ Zn 2+ Cu 2+ Cd 2+ Electrolytic deposition.

[0081] Specifically, such as Figure 1 and Figure 2 As shown, a wastewater treatment system provided in this embodiment of the present invention includes an inlet pump 1, a preliminary water treatment component 2, a first sedimentation unit 3, a secondary water treatment component 4, a second sedimentation unit 5, and a blower 6. The inlet pump 1 is used to connect to a wastewater pipeline, thereby introducing wastewater into the entire system. After entering the system, the wastewater sequentially passes through the preliminary water treatment component 2, the first sedimentation unit 3, the secondary water treatment component 4, and the second sedimentation unit 5, undergoing preliminary treatment, preliminary sedimentation, secondary treatment, and secondary sedimentation processes to complete the wastewater treatment. The blower 6 is connected to both the preliminary water treatment component 2 and the secondary water treatment component 4, thereby supplying air during the water treatment process to ensure its normal operation.

[0082] like Figure 1As shown, in this embodiment, two inlet pumps 1 are configured, connected in parallel and respectively connected to the wastewater pipeline, thereby improving the wastewater transportation efficiency by using the two inlet pumps to jointly transport industrial wastewater. It is understood that the number and specific structure of the inlet pumps 1 can be adapted as needed, and will not be specifically described here.

[0083] like Figure 1 As shown, the preliminary water treatment component 2 is connected to the inlet pump 1. When wastewater flows out of the outlet of the inlet pump 1, it enters the preliminary water treatment component 2 for preliminary treatment. Specifically, the preliminary water treatment component 2 includes multiple preliminary reaction tanks connected in sequence. In this embodiment, the multiple preliminary reaction tanks include a Fenton aeration unit 21, a first coagulation unit 22, and a first flocculation unit 23 connected in sequence. The Fenton aeration unit 21 is connected to the outlet of the inlet pump 1 for aeration oxidation of the wastewater. The first coagulation unit 22 is connected to the Fenton aeration unit 21 for preliminary coagulation of the liquid after aeration oxidation. The first flocculation unit 23 is connected to the first coagulation unit 22 for preliminary flocculation of the liquid after preliminary coagulation. Thus, by sequentially performing aeration oxidation, preliminary coagulation, and preliminary flocculation on the wastewater, a pre-treated liquid is formed.

[0084] The specific structures of the Fenton explosion oxidation section 21, the first coagulation section 22, and the first flocculation section 23 are described in detail below:

[0085] like Figure 1 and Figure 3 As shown, the Fenton explosion oxidation section 21 includes multiple Fenton explosion reaction tanks 211 and multiple oxidant tanks 212. In this embodiment, four Fenton explosion reaction tanks 211 are provided, and the four Fenton explosion reaction tanks are connected sequentially. Figure 3 The tanks are numbered 1-4 from left to right. Among them, Fenton explosion reaction tank 211 is connected to the outlet of liquid pump 1, so that wastewater can be introduced into Fenton explosion reaction tank 211.

[0086] Furthermore, in this embodiment, three oxidizing agent tanks 212 are configured, each independent of the others and containing a different oxidizing agent. For example, in this embodiment, the three oxidizing agent tanks 212 contain hydrogen peroxide, sulfuric acid, and ferrous sulfate, respectively. The three oxidizing agent tanks 212 are connected to the No. 1 Fenton explosion reaction tank 211, thereby introducing the three oxidizing agents into the No. 1 Fenton explosion reaction tank 211 and mixing them with the wastewater.

[0087] In addition, the blower 6 is connected to each Fenton aeration reaction tank 211. Therefore, when the three oxidants are mixed with the wastewater, the blower 6 supplies air and causes the mixed liquid to pass through the four Fenton aeration reaction tanks 1-4 in sequence for four aeration reactions, thereby forming an aeration reaction liquid.

[0088] Thus, the aeration oxidation step of the wastewater is completed by the Fenton aeration oxidation unit 21.

[0089] like Figure 1 and Figure 4 As shown, the first coagulation section 22 includes a first coagulation reaction tank 221 and multiple coagulant tanks 222. The first coagulation reaction tank 221 is connected to the No. 4 Fenton explosion reaction tank 211, allowing the explosion reaction liquid, after oxidation by the explosion gas, to enter the first coagulation reaction tank 221. Furthermore, in this embodiment, there are three coagulant tanks 222, each independent and containing a different coagulant. For example, in this embodiment, the three coagulant tanks 222 contain sodium sulfide, sodium carbonate, and sodium hydroxide, respectively. The three coagulant tanks 222 are connected to the first coagulation reaction tank 221, allowing the three coagulants to be introduced into the first coagulation reaction tank 221 and mixed with the explosion reaction liquid.

[0090] In addition, the blower 6 is connected to the first coagulation reaction tank 221. Therefore, when the three coagulants are mixed with the aeration reaction liquid, air is supplied through the blower 6 to carry out the coagulation reaction in the first coagulation reaction tank 221, thereby forming the coagulation reaction liquid.

[0091] Thus, the initial coagulation step of the wastewater has been completed through the first coagulation section 22.

[0092] like Figure 1 and Figure 5 As shown, the first flocculation section 23 includes a first flocculation reaction tank 231 and a flocculant tank 232. The first flocculation reaction tank 231 is connected to the first coagulation reaction tank 221, allowing the coagulation reaction liquid to enter the first flocculation reaction tank 231. Furthermore, in this embodiment, the flocculant tank 232 contains a flocculant (e.g., polyacrylamide) and is connected to the first flocculation reaction tank 231, thereby introducing the flocculant into the first flocculation reaction tank 231 to mix with the coagulation reaction liquid.

[0093] In addition, the blower 6 is connected to the first flocculation reaction tank 231. When the flocculant and the coagulation reaction liquid are mixed, air is supplied through the blower 6, so that the flocculation reaction takes place in the first flocculation reaction tank 231, thereby forming the flocculation reaction liquid.

[0094] Thus, the initial flocculation step of the wastewater has been completed through the first flocculation section 23.

[0095] like Figure 1 As shown, the first sedimentation section 3 is connected to the preliminary water treatment component 2 for preliminary sedimentation of the pre-treated liquid. Specifically, in this embodiment, the first sedimentation section 3 includes a sedimentation tank 31, multiple inclined tubes 32, and a collection tank 33. The sedimentation tank 31 is connected to the first flocculation reaction tank 231 to receive the flocculation reaction liquid; the multiple inclined tubes 32 are arranged side-by-side in the sedimentation tank 31 for inclined tube sedimentation of the flocculation reaction liquid; the collection tank 33 is located in the sedimentation tank 31 and below the multiple inclined tubes 32 for collecting impurities. Thus, preliminary sedimentation of the flocculation reaction liquid is achieved through inclined tube sedimentation.

[0096] like Figure 1 As shown, the secondary water treatment component 4 is connected to the first sedimentation section 3 and includes multiple sequentially connected secondary reaction tanks for sequentially performing electrocatalytic oxidation, secondary coagulation, and secondary flocculation on the liquid after initial sedimentation, thereby forming a secondary treated liquid. In this embodiment, the multiple secondary reaction tanks sequentially include an electrocatalytic oxidation section 41, a second coagulation section 42, and a second flocculation section 43. The electrocatalytic oxidation section 41 is connected to the first sedimentation section 3 for electrocatalytic oxidation of the liquid after initial sedimentation; the second coagulation section 42 is connected to the electrocatalytic oxidation section 41 for secondary coagulation of the electrocatalytically oxidized liquid; and the second flocculation section 43 is connected to the second coagulation section 42 for secondary flocculation of the liquid after secondary coagulation. Thus, through electrocatalytic oxidation, secondary coagulation, and secondary flocculation, a secondary treated liquid is formed.

[0097] The specific structures of the electrocatalytic oxidation section 41, the second coagulation section 42, and the second flocculation section 43 are described in detail below:

[0098] like Figure 1 and Figure 6 As shown, the electrocatalytic oxidation unit 41 includes a transfer tank 411, a catalyst tank 412, an electrocatalytic oxidation tank 413, and a rectifier 414. Specifically, the transfer tank 411 is connected to the first precipitation unit 3 to temporarily store the liquid after preliminary precipitation. The catalyst tank 412 contains the catalyst and is connected to the transfer tank 411 to mix the catalyst with the liquid after preliminary precipitation. The electrocatalytic oxidation tank 413 is connected to the transfer tank 412, and an electrode module 4131 is placed inside the electrocatalytic oxidation tank to perform an electrocatalytic oxidation reaction on the mixed liquid to form an electrocatalytic reaction liquid. The rectifier 414 is connected to the electrode module 4131 via a cable 415 to provide current.

[0099] In addition, the blower 6 is connected to the electrocatalytic oxidation tank 413. When the rectifier 414 is powered on, air is supplied through the blower 6, and the electrode module 4131 is used to make the mixed liquid undergo electrocatalytic oxidation reaction in the electrocatalytic oxidation tank 413 to form an electrocatalytic reaction liquid.

[0100] Thus, the electrocatalytic reaction step of the initially precipitated liquid is completed by the electrocatalytic oxidation unit 41.

[0101] like Figure 1 and Figure 7 As shown, the second coagulation section 42 includes a second coagulation reaction tank 421 and a thallium removal agent tank 422. The second coagulation reaction tank 421 is connected to the electrocatalytic oxidation tank 413 and to at least one coagulation agent tank 222. In this embodiment, the second coagulation reaction tank 421 is connected to the coagulation agent tank 222 containing sodium hydroxide; however, this can be adapted in other embodiments. The thallium removal agent tank 422 contains thallium removal agent and is connected to the second coagulation reaction tank 421 for introducing the thallium removal agent into the second coagulation reaction tank 421.

[0102] In addition, the blower 6 is connected to the second coagulation reaction tank 421 so that, under the condition of ventilation, a secondary coagulation reaction is carried out by mixing sodium hydroxide, thallium removal agent and electrocatalytic reaction liquid, thereby forming a secondary coagulation reaction liquid.

[0103] Thus, the secondary coagulation step of the electrocatalytic reaction liquid is completed through the second coagulation section 42.

[0104] like Figure 1 and Figure 8 As shown, the second flocculation section 43 includes a second flocculation reaction tank 431. This second flocculation reaction tank 431 is connected to the second coagulation reaction tank 421 and also to the flocculant tank 232. Furthermore, the blower 6 is connected to the second flocculation reaction tank 431 so that, under aeration, a secondary flocculation reaction is carried out by mixing the flocculant with the secondary coagulation reaction liquid, thereby forming a secondary flocculation reaction liquid.

[0105] Understandably, the steps of the secondary flocculation reaction are basically the same as those of the preliminary flocculation reaction, the difference being that the liquids in the two flocculation reaction tanks are different.

[0106] Thus, the secondary flocculation step of the secondary coagulation reaction liquid is completed through the second flocculation section 43, thereby forming a secondary treated liquid.

[0107] like Figure 1As shown, the second sedimentation section 5 is connected to the second flocculation reaction tank 431 for secondary sedimentation of the secondary treated liquid. In this embodiment, the structure of the second sedimentation section 5 is the same as that of the first sedimentation section 3, and will not be described again here. After the secondary sedimentation is completed, the entire wastewater treatment process is finished.

[0108] like Figure 1 As shown, preferably, the wastewater treatment system further includes a recovery unit 7. The recovery unit 7 is connected to the second sedimentation unit 5 to recover the liquid after secondary sedimentation, thereby allowing it to be reused.

[0109] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0110] Furthermore, 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 at least one of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0111] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A wastewater treatment system, characterized by, The utility model relates to a wastewater treatment device, comprising: a liquid inlet pump, the liquid inlet of the liquid inlet pump is communicated with the wastewater pipeline; a preliminary water treatment assembly, which is communicated with the liquid inlet pump and comprises a plurality of preliminary reaction tanks communicated in sequence, for sequentially performing air oxidation, preliminary coagulation and preliminary flocculation on the wastewater, thereby forming a preliminary treatment liquid; a first sedimentation part, which is communicated with the preliminary water treatment assembly, for performing preliminary sedimentation on the preliminary treatment liquid; a secondary water treatment assembly, which is communicated with the first sedimentation part and comprises a plurality of secondary reaction tanks communicated in sequence, for sequentially performing electro-catalytic oxidation, secondary coagulation and secondary flocculation on the liquid after preliminary sedimentation, thereby forming a secondary treatment liquid; a second sedimentation part, which is communicated with the secondary water treatment assembly, for performing secondary sedimentation on the secondary treatment liquid; a fan, which is communicated with the preliminary water treatment assembly and the secondary water treatment assembly respectively, for air supply.

2. The wastewater treatment system of claim 1, wherein, The preliminary water treatment assembly comprises: a Fenton air oxidation part, which is communicated with the liquid outlet of the liquid inlet pump, for air oxidation of the wastewater; a first coagulation part, which is communicated with the Fenton air oxidation part, for preliminary coagulation of the liquid after air oxidation; a first flocculation part, which is communicated with the first coagulation part, for preliminary flocculation of the liquid after preliminary coagulation.

3. The wastewater treatment system of claim 2, wherein The Fenton air oxidation part comprises: a plurality of Fenton air reaction tanks, which are communicated in sequence, and the first Fenton air reaction tank is communicated with the liquid outlet of the liquid inlet pump; a plurality of oxidizing agent tanks, each of which contains a different oxidizing agent and is communicated with the first Fenton air reaction tank; wherein the fan is communicated with each of the Fenton air reaction tanks, so that, in the air supply state, after the mixture of the multiple oxidizing agents and the wastewater passes through the multiple Fenton air reaction tanks in sequence for multiple air oxidation reactions, an air oxidation reaction liquid is formed.

4. The wastewater treatment system of claim 3, wherein, The first coagulation part comprises: a first coagulation reaction tank, which is communicated with the last Fenton air reaction tank; a plurality of coagulation agent tanks, each of which contains a different coagulation agent and is communicated with the first coagulation reaction tank; wherein the fan is communicated with the first coagulation reaction tank, so that, in the air supply state, after the mixture of the multiple coagulation agents and the air oxidation reaction liquid performs a coagulation reaction, a coagulation reaction liquid is formed.

5. The wastewater treatment system of claim 4, wherein, The first flocculation part comprises: a first flocculation reaction tank, which is communicated with the first coagulation reaction tank; a flocculation agent tank, which contains a flocculation agent and is communicated with the first flocculation reaction tank; wherein the fan is communicated with the first flocculation reaction tank, so that, in the air supply state, after the mixture of the flocculation agent and the coagulation reaction liquid performs a flocculation reaction, a flocculation reaction liquid is formed.

6. The wastewater treatment system of claim 5, wherein, The secondary water treatment assembly comprises: an electro-catalytic oxidation part, which is communicated with the first sedimentation part, for electro-catalytic oxidation of the liquid after preliminary sedimentation; a second coagulation part, which is communicated with the electro-catalytic oxidation part, for secondary coagulation of the liquid after electro-catalytic oxidation; a second flocculation part, which is communicated with the second coagulation part, for secondary flocculation of the liquid after secondary coagulation. A second flocculation section in communication with the second coagulation section for secondary flocculation of the secondary coagulation liquid.

7. The wastewater treatment system of claim 6, wherein, The electro-catalytic oxidation section includes: A transfer tank in communication with the first precipitation section for temporarily storing the liquid after primary precipitation; A catalyst tank containing catalyst and in communication with the transfer tank for mixing the catalyst with the liquid after primary precipitation; An electro-catalytic oxidation tank in communication with the transfer tank and having an electrode module placed therein for electro-catalytic oxidation of the mixed liquid to form an electro-catalytic reaction liquid; A rectifier connected to the electrode module by a cable for providing electric current.

8. The wastewater treatment system of claim 7, wherein, The second coagulation section includes: A second coagulation reaction tank in communication with the electro-catalytic oxidation tank and in communication with at least one coagulant tank; A thallium removal agent tank containing thallium removal agent and in communication with the second coagulation reaction tank; The fan is in communication with the second coagulation reaction tank to mix the at least one coagulant and the thallium removal agent with the electro-catalytic reaction liquid for secondary coagulation reaction under aeration to form a secondary coagulation reaction liquid.

9. The wastewater treatment system of claim 8, wherein, The second flocculation section includes: A second flocculation reaction tank in communication with the second coagulation reaction tank and in communication with the flocculant tank; The fan is in communication with the second flocculation reaction tank to mix the flocculant with the secondary coagulation reaction liquid for secondary flocculation reaction under aeration to form a secondary flocculation reaction liquid.

10. The wastewater treatment system of any one of claims 1-9, wherein, The first precipitation section includes: A precipitation tank in communication with the primary water treatment assembly for receiving the primary treatment liquid; A plurality of inclined pipes arranged side by side in the precipitation tank for inclined pipe precipitation of the primary treatment liquid; A collection tank arranged in the precipitation tank below the plurality of inclined pipes for collecting impurities; The second precipitation section has the same structure as the first precipitation section.

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