A sewage pretreatment device

Abstract

The utility model relates to sewage treatment technical field, and disclose a kind of sewage pretreatment equipment, including No. 1 pool, further include: with No. 1 pool communication makes pollutant form small floc No. 2 pool, the one side of No. 2 pool is communicated with No. 3 pool that makes pollutant form big floc;The utility model is through the three-stage dosing reaction of No. 1 pool, No. 2 pool and No. 3 pool, realize the removal of pollutant, activated carbon adsorbs organic matter, pigment and peculiar smell, PAC makes pollutant form small floc, demulsifier destroys oil / colloidal stability and forms big floc, three pool body reaction synergistic effect, significantly improve the removal efficiency of SS, COD, oil and other pollutants, four No. pool adopts inclined pipe filter material structure, pipe is filled with filter material to further intercept small floc, ensure solid-liquid separation, meet subsequent treatment influent requirement, for different sewage type (life / seed germination, printing and dyeing, hospital), provide differentiating reagent dosing scheme.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater pretreatment device. Background Technology

[0002] Wastewater treatment refers to the process of purifying wastewater to meet the water quality requirements for discharge into a water body or reuse. During the transportation of wastewater, large impurities and sediments such as silt can easily cause blockages in the transportation pipelines. Therefore, wastewater needs to be pre-treated to remove large impurities before transportation.

[0003] Traditional wastewater pretreatment often employs single coagulation-sedimentation or adsorption processes, which are insufficient for simultaneously removing multiple pollutants. For example, activated carbon adsorption is effective at removing organic matter and odors, but its ability to remove colloids and oils is limited; PAC coagulation can form flocs, but it is insufficient in disrupting the stability of oils. Different types of wastewater (domestic / seed germination, dyeing and printing, hospital) have significantly different pollutant concentrations, requiring dynamic adjustments to reagent dosage based on water quality. Traditional equipment often relies on empirical methods or static tests to determine reagent dosage, making it difficult to dynamically adjust according to real-time changes in water quality. This leads to excessive reagent dosage when treating low-concentration wastewater, resulting in resource waste and increased operating costs; while insufficient reagent dosage when treating high-concentration wastewater leads to substandard treatment results and may even cause secondary pollution due to residual reagents. Utility Model Content

[0004] The purpose of this utility model is to provide a wastewater pretreatment device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wastewater pretreatment device, comprising a No. 1 tank, and further comprising: A No. 2 pool is connected to the No. 1 pool to form small flocs of pollutants. A No. 3 pool is connected to one side of the No. 2 pool to form large flocs of pollutants. A No. 4 pool is connected to one side of the No. 3 pool to accelerate floc sedimentation. A disinfection pool is connected to one side of the No. 4 pool. A stirring assembly is installed on the No. 1, No. 2, and No. 3 pools. A sewage discharge assembly that discharges wastewater from pools 1, 2, 3, and 4, with a return flow assembly installed between pool 4 and pool 1.

[0006] Preferably, each of the four pools (Pool 1, Pool 2, Pool 3, and Pool 4) has a water outlet, the top of Pool 1 has a water inlet, the water outlet at the connection between Pool 1 and Pool 2 is located at the bottom, the water outlet at the connection between Pool 2 and Pool 3 is located at the top, the water outlet at the connection between Pool 3 and Pool 4 is located at the bottom, and each of the four pools has an observation port.

[0007] Preferably, the fourth pool has several sets of inclined tubes arranged inside, and filter media is installed inside the inclined tubes.

[0008] Preferably, a spiral drain pipe is fixedly installed on one side of the fourth pool.

[0009] Preferably, the sewage discharge assembly includes sewage discharge pipes fixedly installed in pools 1, 2, 3 and 4, with a main pipe fixedly installed on the sewage discharge pipe.

[0010] Preferably, the reflux assembly includes a reflux pipe fixedly installed between pool one and pool four, and a sewage pump and valve are fixedly installed on the reflux pipe.

[0011] Preferably, the stirring assembly includes three motors that are respectively fixedly installed on the top of the first pool, the second pool, and the third pool, and stirring rods are installed at the output ends of the three motors.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention achieves pollutant removal through a three-stage chemical reaction in three tanks: tank 1, tank 2, and tank 3. Activated carbon adsorbs organic matter, pigments, and odors; PAC causes pollutants to form small flocs; and demulsifiers disrupt the stability of oils / colloids and form large flocs. The synergistic effect of the three tanks significantly improves the removal efficiency of pollutants such as SS, COD, and oils. Tank 4 uses an inclined tube filter structure, with filter media filling the tubes to further intercept tiny flocs, ensuring solid-liquid separation and meeting the requirements of subsequent influent treatment. Different chemical dosing schemes are provided for different types of wastewater (domestic / seed germination, printing and dyeing, hospital). Attached Figure Description

[0013] Figure 1 A schematic diagram of the main structure of the wastewater pretreatment equipment provided by this utility model; Figure 2 A schematic diagram of the No. 1 pool structure provided by this utility model; Figure 3 A schematic diagram of the stirring assembly structure provided by this utility model; Figure 4 A schematic diagram of the internal structure of pool No. 4 provided by this utility model; Figure 5 This is a schematic diagram of the internal structure of each pool provided by this utility model.

[0014] In the diagram: 1. Pool 1; 2. Pool 2; 3. Pool 3; 4. Pool 4; 5. Disinfection pool; 6. Agitator assembly; 61. Motor; 62. Agitator rod; 7. Sewage discharge assembly; 71. Sewage discharge pipe; 72. Main pipe; 8. Return assembly; 81. Return pipe; 82. Sewage pump; 83. Valve; 9. Observation port; 10. Inclined pipe; 11. Water outlet; 12. Spiral drain pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 As shown, a wastewater pretreatment device includes a No. 1 pool, and further includes: a No. 2 pool connected to the No. 1 pool to form small flocs of pollutants; a No. 3 pool connected to one side of the No. 2 pool to form large flocs of pollutants; a No. 4 pool connected to one side of the No. 3 pool to accelerate floc sedimentation; a disinfection pool 5 connected to one side of the No. 4 pool; a stirring assembly 6 installed on each of the No. 1, No. 2, No. 3, and No. 3 pools; a sewage discharge assembly 7 for discharging wastewater from the No. 1, No. 2, No. 3, and No. 4 pools; and a return flow assembly 8 installed between the No. 4 pool and the No. 1 pool.

[0017] It should be noted that: Pool 1 is an activated carbon adsorption reaction pool, Pool 2 is a PAC coagulation reaction pool, Pool 3 is a demulsification and sedimentation reaction pool, and Pool 4 is an inclined tube filter media sedimentation pool.

[0018] Each of the four pools (Pool 1, Pool 2, Pool 3, and Pool 4) is equipped with a water outlet 11. Pool 1 has an inlet at its top. The water outlet 11 at the connection between Pool 1 and Pool 2 is located at the bottom, the water outlet 11 at the connection between Pool 2 and Pool 3 is located at the top, and the water outlet 11 at the connection between Pool 3 and Pool 4 is located at the bottom. Each of the four pools is also equipped with an observation port 9. Wastewater enters from the inlet at the top of Pool 1, is treated in Pool 1, and then enters Pool 2 through the water outlet 11 for further treatment. It is then discharged into Pool 3 through the water outlet 11 at the top of Pool 2, and after further treatment, it is discharged into Pool 4 through the water outlet 11. The observation port 9 allows users to observe the condition inside the treatment pools.

[0019] Inside pool 4, several sets of inclined tubes 10 are arranged, and filter media is installed inside the inclined tubes 10. A spiral drain pipe 12 is fixedly installed on one side of pool 4. After the sewage enters, it passes through the inclined tube filter media to accelerate floc sedimentation. After sedimentation for 2 minutes, the supernatant overflows into the spiral drain pipe 12. Sodium hypochlorite tablets (effective chlorine content ≥50%) are placed inside the spiral pipe. The dosage is 1-5g / m³ for domestic / seed germination sewage, according to the treatment volume. 3 Dyeing and printing wastewater 3-8g / m³ 3 Hospital wastewater 50-100g / m³ 3Ensure that the supernatant and chlorine solution are in full contact, test the residual chlorine in the effluent (required to be 0.3-1.0 mg / L), and discharge only after meeting the standards.

[0020] The sewage discharge assembly 7 includes a sewage discharge pipe 71 fixedly installed in pools 1, 2, 3, and 4, with a main pipe 72 fixedly installed on the sewage discharge pipe 71; the return assembly 8 includes a return pipe 81 fixedly installed between pools 1 and 4, with a sewage pump 82 and a valve 83 fixedly installed on the return pipe 81. Sewage inside pools 1, 2, 3, and 4 is discharged through the sewage discharge pipe 71 and then transported to a designated discharge point through the main pipe 72. Sludge settled inside pool 4 is pumped back to pool 1 through the bottom sewage pump 82 (the recommended return ratio is 1:3, i.e., 1 part sludge to 3 parts raw water).

[0021] The stirring assembly 6 includes three motors 61, which are respectively fixedly installed on the top of tank 1, tank 2, and tank 3. Stirring rods 62 are installed at the output ends of the three motors 61. The stirring rods 62 are driven by the motors 61 to rotate, so that the drugs and sewage inside the reaction tank are fully mixed, thereby improving the purification efficiency. The motors 61 are electrically connected to the control terminal through wires. The control terminal can be set on one side of the reaction tank and can be set as a PLC programmable logic controller to control the above-mentioned electrical equipment to work. The above should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can adopt conventional choices in the field. This technical solution will not be further elaborated in detail.

[0022] Working principle: All reaction tanks and sedimentation tanks in this application are made of 304 stainless steel, which is corrosion-resistant and has high strength. Activated carbon is added to tank 1 to adsorb organic matter, pigments, and odors in the sewage. The dosage of activated carbon is 5-10 g / m³ for domestic / seed germination sewage, depending on the sewage quality. 3 Dyeing and printing wastewater 15-20g / m³ 3 Hospital wastewater 10-15g / m³ 3Start stirring component 6 to ensure thorough mixing of activated carbon and wastewater. After reacting for 36 seconds, the wastewater flows naturally into Tank 2. Add PAC (polyaluminum chloride) to Tank 2 to form small flocs. PAC dosage: 20-30 mg / L for domestic / seed germination wastewater, 50-80 mg / L for dyeing and printing wastewater, and 30-50 mg / L for hospital wastewater (PAC needs to be prepared as a 5%-10% aqueous solution before addition). Then start stirring component 6 again. After reacting for 36 seconds, the wastewater flows into Tank 3. Add demulsifier to Tank 3 to disrupt the stability of oils / colloids and form large flocs. Demulsifier dosage: 80-120 mg / L for dyeing and printing wastewater (high oil content), and for hospital / domestic / seed germination wastewater. Wastewater concentration is 30-50 mg / L. The stirring assembly 6 is then activated, and after a reaction of 36 seconds, the wastewater flows into Tank 4. In Tank 4, inclined tube filter media accelerates floc sedimentation, separating solids and liquids for 2 minutes. Sodium hypochlorite tablets disinfect the pipes in the disinfection section. The supernatant comes into contact with chlorine to kill microorganisms. After the wastewater enters, it passes through the inclined tube filter media (recommended to be cleaned every 3 months) to accelerate floc sedimentation. After sedimentation for 2 minutes, the supernatant overflows into the disinfection pipe. Sludge is pumped back to Tank 1 via the bottom sewage pump 82 (recommended return ratio 1:3, i.e., 1 part sludge to 3 parts raw water). Sodium hypochlorite tablets (effective chlorine content ≥50%) are placed in the spiral drain pipe 12 at the supernatant outlet. Dosage is as follows: 1-5 g / m³ for domestic / seed germination wastewater. 3 Dyeing and printing wastewater 3-8g / m³ 3 Hospital wastewater 50-100g / m³ 3 Ensure the supernatant and chlorine solution are in full contact, and test the residual chlorine in the effluent (required to be 0.3-1.0 mg / L). Discharge only after the standard is met. The dosage of the reagent needs to be adjusted according to different types of wastewater (hospital / dyeing wastewater has high pollutant concentrations and needs to be increased appropriately). It is recommended to conduct a small-scale test first to determine the optimal dosage. Sodium hypochlorite tablets are corrosive, so gloves and masks must be worn during operation to avoid direct contact with the skin and respiratory tract. Activated carbon needs to be replaced after it is saturated (generally used every 1-2 months, replaced when the adsorption effect decreases). The used activated carbon must be treated in accordance with hazardous waste regulations. If treating hospital wastewater, additional testing of effluent microbial indicators (such as coliform bacteria ≤3 CFU / L) is required. Discharge is only allowed after the standard is met.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater pretreatment device, comprising a No. 1 tank (1), characterized in that, Also includes: A second pool (2) is connected to the first pool to form small flocs of pollutants. A third pool (3) is connected to one side of the second pool (2) to form large flocs of pollutants. A fourth pool (4) is connected to one side of the third pool (3) to accelerate the sedimentation of flocs. A disinfection pool (5) is connected to one side of the fourth pool (4). A stirring assembly (6) is installed on the first pool (1), the second pool (2) and the third pool (3). A sewage discharge assembly (7) discharges the sewage from the interior of pool 1 (1), pool 2 (2), pool 3 (3) and pool 4 (4), and a return flow assembly (8) is installed between pool 4 (4) and pool 1 (1).

2. The wastewater pretreatment equipment according to claim 1, characterized in that: Water outlets (11) are provided on pool 1 (1), pool 2 (2), pool 3 (3) and pool 4 (4). A water inlet is provided on the top of pool 1 (1). The water outlet (11) at the connection between pool 1 (1) and pool 2 (2) is located at the bottom. The water outlet (11) at the connection between pool 2 (2) and pool 3 (3) is located at the top. The water outlets (11) at pool 3 (3) and pool 4 (4) are located at the bottom. Observation ports (9) are provided on pool 1 (1), pool 2 (2), pool 3 (3) and pool 4 (4).

3. The wastewater pretreatment equipment according to claim 1, characterized in that: The fourth pool (4) has several sets of inclined tubes (10) arranged inside, and filter media is installed inside the inclined tubes (10).

4. The wastewater pretreatment equipment according to claim 1, characterized in that: A spiral drain pipe (12) is fixedly installed on one side of the No. 4 pool (4).

5. The wastewater pretreatment equipment according to claim 1, characterized in that: The sewage discharge assembly (7) includes a sewage discharge pipe (71) fixedly installed in pool 1 (1), pool 2 (2), pool 3 (3) and pool 4 (4), and a main pipe (72) is fixedly installed on the sewage discharge pipe (71).

6. The wastewater pretreatment equipment according to claim 1, characterized in that: The reflux assembly (8) includes a reflux pipe (81) fixedly installed between pool 1 (1) and pool 4 (4), and a sewage pump (82) and a valve (83) are fixedly installed on the reflux pipe (81).

7. The wastewater pretreatment equipment according to claim 1, characterized in that: The stirring assembly (6) includes three motors (61) that are fixedly installed on the top of the first pool (1), the second pool (2) and the third pool (3), respectively, and stirring rods (62) are installed at the output ends of the three motors (61).

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