High-temperature circulating water return pipe drainage recycling device

Abstract

The utility model relates to sewage recovery technical field, concretely is a kind of high-temperature circulating water backwater pipe drainage recycling device, including water supply pump, ceramic membrane filter, clean water tank, water supply pump is connected with mixing tank by doser, ceramic membrane filter is connected with the water outlet of mixing tank, backwash outlet, waste water outlet of ceramic membrane filter are connected with recovery pond and waste water pool, clean water tank is connected with the clean water port of ceramic membrane filter, the clean water port of ceramic membrane filter is also connected with backflusher, overflow and blowdown of clean water tank are connected with discharge pond, the water outlet of clean water tank is connected with recycling tank by sterilizer.The utility model treats waste water by ceramic membrane filter, waste water can not be cooled directly into ceramic membrane system, reduce the complexity degree of waste water treatment, filtered waste water can be recycled, reduce the discharge of waste water, reduce the demand of fresh water, satisfy the environmental protection requirement of water saving and emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of wastewater recycling technology, specifically a high-temperature circulating water return pipe drainage reuse device. Background Technology

[0002] High-temperature wastewater (approximately 30-43°C) from the power plant's circulating water return pipes is typically discharged directly into the rainwater system and then into rivers. However, with increasingly stringent environmental standards, this type of water requires treatment before discharge.

[0003] In related technologies, the circulating water supply pipe after cooling by a cooling tower is generally used to drain water (water temperature about 23-38℃). The water is then recycled through a sedimentation tank + filter + organic membrane ultrafiltration + reverse osmosis scheme. The ultrafiltration effluent is directly discharged into the wastewater treatment equipment for treatment before being discharged into the municipal sewage network. The backwash water is reused, while all cleaning wastewater is discharged into the wastewater treatment equipment for treatment before being discharged into the municipal sewage network.

[0004] However, organic ultrafiltration membranes are fibrous materials made of polyvinylidene fluoride or polyethersulfone, and their influent has high requirements for turbidity, necessitating the installation of a pre-filter. This leads to an increase in water treatment equipment and a more complex pipeline. Furthermore, the ultrafiltration wastewater is directly discharged into the municipal sewage network, resulting in increased sewage discharge fees and a waste of water resources. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature circulating water return pipe drainage reuse device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-temperature circulating water return pipe drainage reuse device includes a water supply pump, a ceramic membrane filter, and a clean water tank; The water pump is connected to a mixing tank via a dosing device. A differential pressure transmitter is installed between the inlet and outlet of the mixing tank, which can uniformly mix the agent with the wastewater, thus facilitating the efficient removal of suspended solids and impurities from the drainage. The ceramic membrane filter is connected to the outlet of the mixing tank. The backwash outlet of the ceramic membrane filter is connected to a recycling water tank and a wastewater tank. The wastewater outlet of the ceramic membrane filter is also connected to a recycling water tank and a wastewater tank. The ultrafiltration drainage is centrally treated, making ultrafiltration drainage more convenient. The recycling water tank is connected to a clarifier, and the water discharged from the clarifier can be reused. The clean water tank is connected to the clean water inlet of the ceramic membrane filter, and the clean water inlet of the ceramic membrane filter is also connected to a backwasher. The backwasher is used to maintain the membrane flux of the ceramic membrane filter, resulting in high filtration efficiency. The overflow port and sewage outlet of the clean water tank are connected to a discharge pool. The outlet of the clean water tank is connected to a reuse tank through a sterilizer, reducing wastewater discharge and minimizing water waste.

[0007] Furthermore, an electric gate valve is installed on the upper surface of the mixing tank, and the electric gate valve is connected to a sample storage box, which can collect water samples after uniform mixing. When the pressure in the mixing tank is too high, it can also release pressure to ensure the stable operation of the mixing tank.

[0008] Furthermore, the inlet of the ceramic membrane filter is connected to a chemical cleaning inlet pipe, and the backwash outlet of the ceramic membrane filter is also connected to a chemical cleaning outlet pipe, so as to realize chemical cleaning, remove scale and contaminants on the surface of the ceramic membrane in a timely manner, restore membrane flux, avoid performance degradation of the ceramic membrane due to clogging, and extend the service life of the ceramic membrane.

[0009] Furthermore, the dosing device includes a PAC dosing pump and a first bactericide delivery pump. The PAC dosing pump and the first bactericide delivery pump are connected to the mixing tank through a first coil. The PAC is fully hydrolyzed to form flocs and the bactericide is evenly dispersed, thereby improving the pretreatment effect.

[0010] Furthermore, the backwasher includes an acid pump, an alkali pump, and a second bactericide delivery pump. The acid pump, alkali pump, and second bactericide delivery pump are connected to the clean water inlet of the ceramic membrane filter through a second coil. During the backwashing process, bactericide is added to simultaneously kill microorganisms on the surface of the ceramic membrane, prevent microorganisms from causing further contamination of the ceramic membrane, and maintain the cleanliness of the ceramic membrane.

[0011] Furthermore, the sterilizer includes a third bactericide delivery pump and a reducing agent delivery pump. The third bactericide delivery pump and the reducing agent delivery pump are connected to the outlet of the clean water tank through a third coil to ensure the sterilization effect, eliminate the risk of agent residue, ensure that the water quality in the reuse tank meets the water quality requirements of industrial circulating water or other reuse scenarios, and improve the safety of reuse.

[0012] Furthermore, the outlet of the clean water tank is connected to two booster pumps, which are connected to the second coil. One booster pump is in use and the other is on standby. When one of them fails, the other can be put into operation to avoid backwashing interruption due to booster pump failure and ensure the continuous and stable operation of the ceramic membrane filter.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) By treating wastewater through ceramic membrane filters, the wastewater can enter the ceramic membrane system directly without cooling, reducing the complexity of wastewater treatment. The filtered wastewater can be recycled and reused, reducing the amount of wastewater discharged and the demand for fresh water, thus meeting the environmental protection requirements of water conservation and emission reduction.

[0014] (2) The mixing tank mixes wastewater, PAC and bactericide. Impurities in the wastewater flocculate into clumps and are effectively intercepted by the ceramic membrane filter. The bactericide sterilizes the wastewater and prevents microorganisms from affecting the operation of the ceramic membrane filter.

[0015] (3) Chemical cleaning inlet pipe for forward cleaning of ceramic membrane filter, acid pump, alkali pump and second bactericide delivery pump for backwashing of ceramic membrane filter, to maintain stable filtration performance of ceramic membrane, ensure stable effluent quality and treatment capacity, and avoid problems such as increased effluent turbidity and decreased treatment efficiency caused by membrane fouling. Attached Figure Description

[0016] Figure 1 This is a flowchart of the wastewater treatment process according to this utility model; Figure 2 This is an enlarged view of the mixing tank portion of this utility model; Figure 3 This is an enlarged view of the ceramic membrane filter portion of this utility model; Figure 4 This is an enlarged view of the water tank part of this utility model.

[0017] In the diagram: 1. Feed pump; 2. First coil; 3. PAC dosing pump; 4. First bactericide delivery pump; 5. Mixing tank; 6. Chemical cleaning outlet pipe; 7. Chemical cleaning inlet pipe; 8. Ceramic membrane filter; 9. Acid pump; 10. Alkali pump; 11. Second bactericide delivery pump; 12. Second coil; 13. Clean water tank; 14. Third coil; 15. Third bactericide delivery pump; 16. Reducing agent delivery pump; 17. Reuse tank; 18. Sample storage box; 19. Manual valve; 20. Pressure indicator; 21. Differential pressure transmitter; 22. Electric gate valve; 23. FI-FT instrument; 24. PI-PT instrument; 25. Automatic valve; 26. Backup tank; 27. Ball valve; 28. Recycled water tank; 29. ​​Wastewater tank; 30. NTU instrument; 31. ORP instrument; 32. LI-LT instrument; 33. Lift pump; 34. Discharge tank. Detailed Implementation

[0018] 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.

[0019] Example: Please see Figure 1-4 This utility model provides a technical solution: A high-temperature circulating water return pipe drainage reuse device includes a water supply pump 1, a ceramic membrane filter 8, a clean water tank 13, and several automatic valves 25 installed in the pipeline, which can reduce manual operation, facilitate automatic operation, and achieve efficient wastewater treatment. The water supply pump 1 is connected to the mixing tank 5 via a dosing device. The dosing device includes a PAC (polyaluminum chloride) dosing pump and a first bactericide delivery pump 4. The first bactericide delivery pump 4 delivers NaClO. NaClO kills bacteria, algae, etc. in the wastewater, preventing them from forming a biofilm on the surface of the mixing tank 5 and the ceramic membrane, thus preventing blockage or corrosion of the equipment. The PAC dosing pump 3 and the first bactericide delivery pump 4 are connected to the mixing tank 5 via a first coil 2. PAC adsorbs suspended particles and colloidal impurities in the water, agglomerating them into large flocs, which are easily intercepted and removed by the subsequent ceramic membrane filter 8, reducing the turbidity of the effluent.

[0020] The ceramic membrane filter 8 is connected to the outlet of the mixing tank 5. Multiple ceramic membrane filters 8 are installed to increase the wastewater treatment capacity. The backwash outlet of the ceramic membrane filter 8 is connected to the recovery water tank 28 and the wastewater tank 29. The wastewater outlet of the ceramic membrane filter 8 is also connected to the recovery water tank 28 and the wastewater tank 29. The acid and alkali cleaning wastewater is discharged into the wastewater tank 29 for treatment and then discharged into the municipal sewage network. Neutral water (backwash drainage and chemical cleaning wastewater) is discharged into the recovery water tank 28 for recycling. The recovery water tank 28 is connected to a clarifier for clarification and reuse.

[0021] The ceramic membrane filter 8 is also connected to the backup tank 26 via a ball valve 27. In an emergency, the backup tank 26 can be used to collect backwash drainage.

[0022] The clean water tank 13 is connected to the clean water inlet of the ceramic membrane filter 8. The clean water inlet of the ceramic membrane filter 8 is also connected to a backwasher to remove suspended particles, flocs, microbial films and other impurities attached to the surface of the ceramic membrane, so as to prevent these pollutants from clogging the membrane pores or covering the membrane surface, prevent the membrane flux from decreasing and reduce the replacement frequency of the membrane module.

[0023] The overflow port and sewage outlet of the clean water tank 13 are connected to the discharge pool 34, and excess water can be discharged into the discharge pool 34. When the clean water tank 13 is discharged, the water can be collected. The outlet of the clean water tank 13 is connected to the reuse tank 17 through a sterilizer. The sterilizer ensures that the water quality is qualified and meets the reuse standard. The inlet pipe of the clean water tank 13 is equipped with an ORP instrument 31 (oxidation-reduction potential meter) and an NTU instrument 30 (turbidity meter). The clean water tank 13 is equipped with a LI-LT instrument 32 (a combination instrument of liquid level indicator and liquid level transmitter).

[0024] In this embodiment, as Figure 1 and Figure 2 As shown, an electric gate valve 22 is installed on the upper surface of the mixing tank 5. The electric gate valve 22 is connected to a sample storage box 18. A differential pressure transmitter 21 is installed between the inlet and outlet of the mixing tank 5. Opening the electric gate valve 22 allows sampling of the wastewater in the mixing tank 5. When the differential pressure transmitter 21 detects abnormal pressure at the inlet and outlet of the mixing tank 5, the electric gate valve opens, ensuring the normal operation of the mixing tank 5. The wastewater in the sample storage box 18 can also be sent into the mixing tank 5, reducing wastewater discharge.

[0025] Pressure indicators 20 are installed at both the inlet and outlet of the mixing tank 5, allowing for individual pressure monitoring. The pipeline of the mixing tank 5 is equipped with three manual valves 19. When the mixing tank 5 malfunctions, the manual valves 19 at the inlet and outlet of the mixing tank 5 are closed, and the manual valve 19 at the bottom is opened, allowing wastewater to bypass the mixing tank 5 and enter the ceramic membrane filter 8.

[0026] In this embodiment, as Figure 1 and Figure 3 As shown, the inlet of the ceramic membrane filter 8 is connected to a chemical cleaning inlet pipe 7, which is used to perform forward cleaning of the ceramic membrane filter 8. The backwash outlet of the ceramic membrane filter 8 is also connected to a chemical cleaning outlet pipe 6. After the ceramic membrane filter 8 is cleaned, some of the chemical cleaning solution is recovered from the chemical cleaning outlet pipe 6 to reduce waste.

[0027] The chemical cleaning outlet pipe 6 is equipped with an FI-FT instrument 23 (a combination instrument for flow indication and flow transmission), the inlet pipe of the ceramic membrane filter 8 is equipped with a PI-PT instrument 24 (a combination instrument for pressure indication and pressure transmission), and the outlet pipe of the ceramic membrane filter 8 is equipped with both PI-PT instrument 24 and FI-FT instrument 23.

[0028] In this embodiment, as Figure 1 As shown, the backwasher includes an acid pump 9, an alkali pump 10, and a second disinfectant delivery pump 11. The acid pump 9, the alkali pump 10, and the second disinfectant delivery pump 11 are connected to the clean water inlet of the ceramic membrane filter 8 through a second coil 12. The acid pump 9 delivers hydrochloric acid, the alkali pump 10 delivers sodium hydroxide, and the second disinfectant delivery pump 11 delivers NaClO.

[0029] Hydrochloric acid is used to remove inorganic scaling contaminants from the membrane surface, such as hard scale like calcium carbonate and calcium sulfate. Sodium hydroxide removes organic contaminants from the membrane surface, such as humic substances and microbial metabolic products. NaClO is used to kill microorganisms on the membrane surface and remove biofilm, achieving comprehensive backwashing of the ceramic membrane filter 8.

[0030] In this embodiment, as Figure 1 As shown, the sterilizer includes a third bactericide delivery pump 15 and a reducing agent delivery pump 16. The third bactericide delivery pump 15 and the reducing agent delivery pump 16 are connected to the outlet of the clear water tank 13 through a third coil 14. The third bactericide delivery pump 15 delivers a non-oxidizing bactericide. The non-oxidizing bactericide (such as quaternary ammonium salts and isothiazolinones) achieves sterilization by destroying the cell membrane of microorganisms and inhibiting enzyme activity. It does not react with reducing substances in the water and is suitable for deep sterilization of the water effluent from the clear water tank 13. The reducing agent neutralizes excess non-oxidizing bactericide residues. The reducing agent can also simultaneously reduce residual NaClO, improving water quality stability.

[0031] In this embodiment, as Figure 1 As shown, the outlet of the clean water tank 13 is connected to two lift pumps 33. The lift pumps 33 are connected to the second coil 12. The lift pumps 33 are equipped with pressure indicators 20 to provide a stable and sufficient backwash water source for the ceramic membrane filter 8, ensuring that the backwash water flow and pressure meet the backwash requirements of the ceramic membrane and improving the removal efficiency of pollutants on the membrane surface.

[0032] Specifically, during use, the water pump 1 draws up the wastewater and delivers it to two mixing tanks 5. During the delivery process, the PAC dosing pump 3 and the first bactericide delivery pump 4 deliver PAC and NaClO to the wastewater. The mixing tank 5 is equipped with a stirring motor to mix PAC, NaClO and wastewater evenly. Wastewater discharged from mixing tank 5 enters several ceramic membrane filters 8. PAC plays a flocculation role in the wastewater, causing suspended particles and colloidal impurities in the water to aggregate and become larger, making them unable to pass through the ceramic membrane filters 8, thus achieving the separation of impurities from water and realizing ultrafiltration of wastewater. The filtered water discharged from the ceramic membrane filter 8 is stored in three clean water tanks 13. The water discharged from the clean water tanks 13 flows to the reuse tank 17 for reuse. During the flow of the clean water, non-oxidizing bactericides and reducing agents are added through the third bactericide delivery pump 15 and the reducing agent delivery pump 16 to achieve water purification.

[0033] When cleaning the ceramic membrane filter 8, backwashing is performed first. The acid pump 9, alkali pump 10, and second bactericide delivery pump 11 send the hydrochloric acid, alkali solution, and bactericide used for cleaning into the ceramic membrane filter 8. If there are too many impurities in the liquid discharged from the initial backwash, it can be discharged into the wastewater tank 29. The water in the wastewater tank 29 is treated and discharged into the municipal pipe network. After backwashing for a period of time, the backwash liquid is discharged into the recycling water tank 28. The water in the recycling water tank 28 can be reused after clarification. After backwashing, forward washing is performed. Chemical cleaning inlet pipe 7 sends chemical cleaning agent into ceramic membrane filter 8. Initial forward washing wastewater is sent to recycling tank 28. After forward washing for a period of time, forward washing wastewater is discharged from chemical cleaning outlet pipe 6 to recover chemical cleaning agent.

[0034] The ceramic membrane filter is divided into two groups, which can be cleaned alternately without delaying wastewater treatment.

[0035] 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 high-temperature circulating water return pipe drainage reuse device, characterized in that, include: A water supply pump is connected to a mixing tank via a dosing device, and a differential pressure transmitter is installed between the inlet and outlet of the mixing tank. A ceramic membrane filter is connected to the outlet of a mixing tank. The backwash outlet of the ceramic membrane filter is connected to a recovery water tank and a wastewater tank. The wastewater outlet of the ceramic membrane filter is also connected to a recovery water tank and a wastewater tank. The recovery water tank is connected to a clarifier. A clean water tank is connected to the clean water outlet of a ceramic membrane filter. The clean water outlet of the ceramic membrane filter is also connected to a backwasher. The overflow outlet and the sewage outlet of the clean water tank are connected to a discharge pool. The outlet of the clean water tank is connected to a reuse tank through a sterilizer.

2. The high-temperature circulating water return pipe drainage reuse device according to claim 1, characterized in that: An electric gate valve is installed on the upper surface of the mixing tank, and the electric gate valve is connected to a sample storage box.

3. The high-temperature circulating water return pipe drainage reuse device according to claim 1, characterized in that: The inlet of the ceramic membrane filter is connected to a chemical cleaning inlet pipe, and the backwash outlet of the ceramic membrane filter is also connected to a chemical cleaning outlet pipe.

4. The high-temperature circulating water return pipe drainage reuse device according to claim 1, characterized in that: The dosing device includes a PAC dosing pump and a first bactericide delivery pump, which are connected to the mixing tank via a first coil.

5. The high-temperature circulating water return pipe drainage reuse device according to claim 1, characterized in that: The backwasher includes an acid pump, an alkali pump, and a second bactericide delivery pump, which are connected to the clean water inlet of the ceramic membrane filter via a second coil.

6. The high-temperature circulating water return pipe drainage reuse device according to claim 1, characterized in that: The sterilizer includes a third sterilizing agent delivery pump and a reducing agent delivery pump, which are connected to the outlet of the clean water tank via a third coil.

7. The high-temperature circulating water return pipe drainage reuse device according to claim 5, characterized in that: The outlet of the clean water tank is connected to two booster pumps, and the booster pumps are connected to the second coil.

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