Biological trickling filtration water distribution and caustic soda flake addition PH value callback device

Abstract

The utility model discloses a biological trickling filtration water distribution and caustic soda flake callback PH value device which comprises a plurality of evaporators which are connected in series through a steam output pipeline and a concentrated solution output pipeline, the steam output pipeline of the last effect evaporator is provided with a condenser, the refrigerant of the condenser is water, and the concentrated solution output pipeline of the last effect evaporator is connected with the steam output pipeline of the last effect evaporator. A refrigerant output end of the condenser is fed into caustic soda flake adding equipment through a primary water pipeline, and a caustic soda flake tank is arranged at the top of the caustic soda flake adding equipment. According to the biological trickling filtration water distribution and caustic soda flake adding PH value back-adjusting device, the temperature of caustic soda flake water distribution is increased by utilizing the heat of the last-effect steam of the multi-effect evaporator, so that the temperature of the caustic soda flake water distribution reaches the temperature for efficiently dissolving caustic soda flakes, the device adapts to a cold outdoor caustic soda flake water distribution environment, and the efficiency and the solubility of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for adjusting pH value by adding caustic soda to water for biological trickling filtration. Background Art

[0002] Sodium hydroxide (caustic soda) is a strong alkaline substance. When dissolved in water, it significantly increases the pH value of the aqueous solution, making it alkaline. By adding an appropriate amount of caustic soda, it can react with the acidic substances in the water to generate salt and water, thereby adjusting the pH value of the water. Usually, for every 1.0 degree increase in pH, 10 grams of caustic soda per cubic meter of water is required. For example, to increase the pH value of 1,000 cubic meters of water by 1, 10 kilograms of caustic soda is required.

[0003] Caustic soda is generally added by dissolving the caustic soda in the distribution water in equal proportion through an automatic caustic soda dosing device, and then injecting it into the wastewater to adjust the pH value of the wastewater. However, due to the cold weather in the north in winter, the automatic caustic soda dosing device is usually set up outdoors, and the distribution water temperature is usually low, and even the water supply in the pipeline is frozen, resulting in the dissolution speed of the caustic soda in the distribution water being slowed down, the dissolution efficiency being low, and it being difficult to mix evenly before injecting it into the wastewater. Therefore, it is necessary to make technical improvements to the defects of the existing technology. Utility Model Content

[0004] The purpose of the utility model is to provide a device for adjusting the pH value of water by adding caustic soda to biological trickling filtration, so as to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A device for adjusting the pH value by adding caustic soda to water for biological trickling filtration comprises a plurality of evaporators connected in series via a steam output pipeline and a concentrated liquid output pipeline. The steam output pipeline of the last-effect evaporator is provided with a condenser. The refrigerant of the condenser is water. The refrigerant output end of the condenser is fed into a caustic soda adding device via a primary water pipeline. A caustic soda tank is provided on the top of the caustic soda adding device.

[0007] As a further solution of the present invention: it also includes a primary water storage tank, and the output end of the primary water storage tank is fed into the refrigerant input end of the condenser through a refrigerant pipeline.

[0008] As a further solution of the present invention: a recovery water pipeline and a water source pipeline are provided on the top of the primary water storage tank, and a drainage pipeline is installed on the refrigerant pipeline through a three-way valve.

[0009] As a further solution of the present invention: the primary water pipeline is installed with a circulation pipeline connected to the primary water storage tank through a three-way valve.

[0010] As a further solution of the present invention: the alkali adding device is equipped with a circulating liquid pumping pipeline, and the circulating liquid pumping pipeline is equipped with a liquid pump.

[0011] As a further solution of the present invention: one end of the circulating liquid pipeline is connected to the outside of the caustic soda adding equipment, and the other end is connected to the bottom of the caustic soda adding equipment. The liquid pump draws the mixed liquid from the middle part of the caustic soda adding equipment and pumps it into the bottom to form a circulation.

[0012] As a further solution of the present invention: a mixed liquid output pipeline is provided on one side of the bottom of the alkali adding device.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The device for adjusting pH value by adding caustic soda to water by trickling filtration utilizes the heat of the final-effect steam of the multi-effect evaporator to heat the caustic soda water supply temperature to a temperature that can efficiently dissolve the caustic soda. This device is suitable for cold outdoor caustic soda water supply environments and improves its efficiency and solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a bio-trickling filter water distribution and caustic soda ash adjustment device.

[0016] In the figure: 1. Last-effect evaporator; 2. Steam output pipeline; 3. Condenser; 4. Non-condensable gas pipeline; 5. Condensate pipeline; 6. Primary water storage tank; 7. Refrigerant pipeline; 8. Drain pipeline; 9. Primary water pipeline; 10. Circulation pipeline; 11. Alkali addition equipment; 12. Caustic soda flake tank; 13. Circulation liquid pumping pipeline; 14. Liquid pump; 15. Mixed liquid output pipeline. DETAILED DESCRIPTION

[0017] See also Figure 1In the embodiment of the utility model, a device for adjusting the pH value of water by adding caustic soda to a biological trickling filter comprises a plurality of evaporators 1 connected in series via a steam output pipeline 2 and a concentrate output pipeline. The steam output pipeline 2 of the last-effect evaporator 1 is provided with a condenser 3. The refrigerant of the condenser 3 is water. The refrigerant output end of the condenser 3 is fed into a caustic soda adding device 11 via a primary water pipeline 9. A caustic soda tank 12 is provided on the top of the caustic soda adding device 11. The multi-effect evaporation technology of the evaporator 1 is patented with patent number 2024227228241. The technology will not be described in detail here. The present application utilizes the high-temperature steam output from the multiple-effect evaporation system as the heat medium, and the water distribution of the alkali addition device 11 as the cold medium. The two perform heat exchange through the condenser 3. The condenser 3 can be a tubular heat exchanger. During the mutual heat exchange process between the two media, the high-temperature steam is cooled to produce condensed water, and the steam is discharged. The condenser 3 is provided with a non-condensable gas pipeline 4 and a condensed water pipeline 5 to discharge the gas and condensed water, and the water distribution of the alkali addition device 11 can reach a temperature of 30-50 degrees Celsius or more during the heat exchange process.

[0018] Solubility of caustic soda at different temperatures

[0019] 0℃: solubility is about 42g / 100g water;

[0020] 20℃: solubility is about 108g / 100g water;

[0021] 25℃: Solubility is about 113g / 100g water;

[0022] 30℃: solubility is about 118g / 100g water;

[0023] 100℃: solubility is about 347g / 100g water;

[0024] It can be seen that when the water distribution temperature of the alkali addition equipment 11 is increased to above 20 degrees Celsius through heat exchange, the solubility of the caustic soda flakes can be effectively improved, so that they are fully dissolved, the mixing time is shortened and the solubility is increased. At the same time, the steam condensation rate of the last-effect evaporator 1 can also be effectively increased.

[0025] In a preferred embodiment, it also includes a primary water storage tank 6, the output end of the primary water storage tank 6 is fed into the refrigerant input end of the condenser 3 through the refrigerant pipeline 7, and a recovery water pipeline 17 and a water source pipeline 16 are provided on the top of the primary water storage tank 6. The refrigerant pipeline 7 is installed with a drainage pipeline 8 through a three-way valve. The primary water storage tank 6 can be recycled water, and the condensed water in the evaporator 1 cannot be used directly. The original waste water in the evaporator 1 is industrial waste water, and its steam will contain a large amount of toxic substances, so it cannot be used for flake caustic soda water distribution. The flake caustic soda water of the primary water storage tank 6 can be the hot water exchange water or water vapor condensate of the thermal power station, which can effectively reduce water use.

[0026] In a preferred embodiment, the primary water pipeline 9 is installed with a circulation pipeline 10 connected to the primary water storage tank 6 through a three-way valve. When the caustic soda adding device 11 is stopped, the circulation pipeline 10 can circulate and heat the water in the primary water storage tank 6, and then circulate it into the primary water storage tank 6 for storage. When the storage in the primary water storage tank 6 reaches a certain amount, it can be discharged through the drainage pipeline 8.

[0027] In a preferred embodiment, a circulating liquid pumping pipeline 13 is installed on the alkali addition device 11, and a liquid pump 14 is installed on the circulating liquid pumping pipeline 13. One end of the circulating liquid pumping pipeline 13 is connected to the outside of the flake caustic soda addition device 11, and the other end is connected to the bottom of the flake caustic soda addition device 11. The liquid pump 14 draws out the mixed liquid from the middle part of the flake caustic soda addition device 11 and pumps it into the bottom to form a circulation. The present application mixes the flake caustic soda with the distribution water by means of internal liquid pumping, and with the appropriate distribution water temperature, can quickly form a mixed liquid for water pH adjustment treatment. A mixed liquid output pipeline 15 is provided on one side of the bottom of the alkali addition device 11, and after mixing is completed, it is discharged into the treated water through the mixed liquid output pipeline 15.

[0028] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.

[0029] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A device for adjusting pH value by adding caustic soda to water by biological trickling filtration, comprising a plurality of evaporators (1) connected in series via a steam output pipeline (2) and a concentrated liquid output pipeline, wherein the steam output pipeline (2) of the last-effect evaporator (1) is provided with a condenser (3), characterized in that: The refrigerant of the condenser (3) is water. The refrigerant output end of the condenser (3) is fed into the caustic soda adding device (11) through a primary water pipeline (9). A caustic soda tank (12) is provided on the top of the caustic soda adding device (11).

2. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 1, characterized in that: It also includes a primary water storage tank (6), the output end of the primary water storage tank (6) is fed into the refrigerant input end of the condenser (3) through a refrigerant pipeline (7).

3. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 2, characterized in that: A water recovery pipeline (17) and a water source pipeline (16) are provided on the top of the primary water storage tank (6), and a drainage pipeline (8) is installed on the refrigerant pipeline (7) via a three-way valve.

4. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 2, characterized in that: The primary water pipeline (9) is provided with a circulation pipeline (10) connected to the primary water storage tank (6) via a three-way valve.

5. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 1, characterized in that: The alkali addition device (11) is provided with a circulating liquid pumping pipeline (13), and a liquid pump (14) is provided on the circulating liquid pumping pipeline (13).

6. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 5, characterized in that: One end of the circulating liquid pumping pipeline (13) is connected to the outside of the caustic soda adding device (11), and the other end is connected to the bottom of the caustic soda adding device (11). The liquid pump (14) draws the mixed liquid from the middle part of the caustic soda adding device (11) and pumps it into the bottom to form a circulation.

7. The device for adjusting pH value by adding caustic soda to water for biological trickling filtration according to claim 1, characterized in that: A mixed liquid output pipeline (15) is provided on one side of the bottom of the alkali addition device (11).

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