Peroxide alkaline hydrolysis treatment equipment for residual activated sludge in sewage treatment

Abstract

The utility model relates to excess activated sludge peroxy alkaline hydrolysis treatment equipment for sewage treatment, which belongs to the technical field of sewage treatment and comprises a sewage pool and an activated sludge sewage treatment system. A sewage lifting pump communicated with the sewage tank and the activated sludge sewage treatment system through pipelines is arranged between the sewage tank and the activated sludge sewage treatment system, and a sewage regulating tank is arranged between the sewage lifting pump and the sewage tank; a plurality of peroxy alkaline hydrolysis tanks which are communicated through parallel pipelines are arranged between the activated sludge sewage treatment system and the sewage adjusting tank, and alkaline hydrolysis sludge pumps are arranged between the peroxy alkaline hydrolysis tanks and the sewage adjusting tank. The device has the characteristics of simplicity and convenience in operation control, flexibility in operation, energy conservation, environment friendliness and simple structure, and is convenient for continuous production. The low-cost, harmless and reduction treatment on the sludge is realized.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment equipment for the peroxyalkaline hydrolysis of residual activated sludge. Background Technology

[0002] Wastewater treatment processes generate a large amount of residual activated sludge. Currently, the main methods for treating residual sludge generated by wastewater treatment plants in my country include direct landfilling, drying and incineration, and use as organic fertilizer. These methods are prone to causing secondary pollution, posing environmental safety hazards, and are also costly, placing a certain economic burden on enterprises.

[0003] 1. Direct landfill: Direct landfilling of sludge is a simple, easy, and low-cost disposal method. However, when sludge is leached by rainwater, the leachate will carry some nitrogen, phosphorus, heavy metals, and harmful chemicals, which will pollute the land, rivers, lakes, and groundwater. The gas produced by landfills is mainly methane, which can cause explosions and fires if appropriate measures are not taken.

[0004] 2. Drying and incineration: Drying wet sludge and then directly incinerating it is a common method. It can carbonize all organic matter, kill pathogens, and minimize the volume of sludge. However, its disadvantages are that the investment in treatment facilities is large, the treatment cost is high, and it produces carcinogenic substances such as dioxins, which pollute the atmosphere.

[0005] 3. Direct application: Applying untreated sludge directly to the land poses a risk of secondary pollution. The harmful substances it contains can alter soil quality and structure, affect the activity of soil microorganisms, hinder plant root growth, or accumulate in plant organisms. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a peroxyalkaline hydrolysis treatment device for wastewater treatment wastewater sludge. This device features simple operation and control, flexible operation, energy saving and environmental protection, and a simple structure, facilitating continuous production. It achieves low-cost, harmless, and volume-reduced treatment of sludge.

[0007] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0008] An alkaline hydrolysis treatment device for wastewater treatment wastewater sludge includes a wastewater tank and an activated sludge-to-wastewater treatment system. A wastewater lift pump is connected to the wastewater tank and the activated sludge-to-wastewater treatment system via pipelines. A wastewater equalization tank is connected to the wastewater tank via the wastewater lift pump. Several alkaline hydrolysis tanks connected in parallel via pipelines are connected to the activated sludge-to-wastewater treatment system and the wastewater equalization tank. An alkaline hydrolysis sludge pump is connected to the alkaline hydrolysis tank and the wastewater equalization tank.

[0009] Preferably, the activated sludge wastewater treatment system includes an external discharge tank and a thickening tank, wherein an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank are sequentially arranged between the thickening tank and the wastewater lift pump.

[0010] Preferably, a sludge discharge pump is provided between the thickening tank and the peroxyalkaline hydrolysis tank.

[0011] Preferably, a sludge dewatering machine is provided between the sludge pump and the peroxyalcohol hydrolysis tank, and a sludge discharge valve is provided between the sludge dewatering machine and the sludge pump.

[0012] Preferably, the wastewater regulating tank is equipped with a mixer, a temperature sensor is installed inside the wastewater regulating tank, a steam delivery pipe is installed on the wastewater regulating tank, and a temperature regulating valve connected to the temperature sensor is installed on the steam delivery pipe.

[0013] Preferably, sewage valves are provided between the sewage tank and the sewage equalization tank, between the activated sludge sewage treatment system and the sewage lift pump, between the activated sludge sewage treatment system and the peroxyalkaline hydrolysis tank, between the peroxyalkaline hydrolysis tank and the alkali hydrolysis sludge pump, between the alkali hydrolysis sludge pump and the sewage equalization tank, and between the sewage equalization tank and the sewage lift pump.

[0014] Preferably, pH sensors are installed in both the wastewater equalization tank and the oxygen-alkali hydrolysis tank. A dosing device is installed outside the wastewater equalization tank and the oxygen-alkali hydrolysis tank. A pH controller connected to the pH sensor is installed between the dosing device and the pH sensor. A dosing valve is installed between the dosing device and the wastewater equalization tank and between the dosing device and the oxygen-alkali hydrolysis tank.

[0015] Preferably, each of the oxygen-alkali hydrolysis tanks is equipped with a microporous aeration pipe frame, and a Roots blower connected to the microporous aeration pipe frame is installed on the outside of the oxygen-alkali hydrolysis tank. An air regulating valve is installed between the Roots blower and the microporous aeration pipe frame.

[0016] This invention can achieve the following effects:

[0017] This invention provides a peroxyalkaline hydrolysis treatment device for wastewater treatment wastewater sludge. Compared with existing technologies, it features simple operation and control, flexible operation, energy saving and environmental protection, and a simple structure, facilitating continuous production. It achieves low-cost, harmless, and volume-reduced treatment of sludge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the activated sludge wastewater treatment system of this utility model.

[0020] In the diagram: 1. Wastewater tank; 2. Wastewater valve; 3. Activated sludge wastewater treatment system; 4. Dosing valve; 5. Dosing device; 6. pH sensor; 7. Alkali hydrolysis tank; 8. Microporous aeration pipe frame; 9. Air regulating valve; 10. Roots blower; 11. Alkali hydrolysis sludge pump; 12. pH controller; 13. Wastewater equalization tank; 14. Steam delivery pipe; 15. Temperature regulating valve; 16. Mixer; 17. Temperature sensor; 18. Wastewater lift pump; 19. Anaerobic tank; 20. Anoxic tank; 21. Aerobic tank; 22. Sedimentation tank; 23. External discharge tank; 24. Thickening tank; 25. Sludge discharge pump; 26. Sludge filter press and dryer; 27. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: Figure 1 and Figure 2As shown, a wastewater treatment equipment for the alkaline hydrolysis of excess activated sludge includes a wastewater tank 1 and an activated sludge-to-wastewater treatment system 3. The activated sludge-to-wastewater treatment system 3 includes an external discharge tank 23 and a thickening tank 24. An anaerobic tank 19, an anoxic tank 20, an aerobic tank 21, and a sedimentation tank 22 are sequentially arranged between the thickening tank 24 and the wastewater lift pump 18. The wastewater lift pump 18 is connected to the wastewater tank 1 and the activated sludge-to-wastewater treatment system 3 by pipeline. A wastewater equalization tank 13 is provided between the wastewater lift pump 18 and the wastewater tank 1. A mixer 16 is installed on the wastewater equalization tank 13. A temperature sensor 17 is installed inside the wastewater equalization tank 13. A steam delivery pipe 14 is installed on the wastewater equalization tank 13. A temperature regulating valve 15, which is electrically connected to the temperature sensor 17, is installed on the steam delivery pipe 14. Two parallel-connected peroxyalkaline hydrolysis tanks 7 are located between the activated sludge wastewater treatment system 3 and the wastewater equalization tank 13. Each peroxyalkaline hydrolysis tank 7 is equipped with a microporous aeration pipe frame 8. A Roots blower 10, connected to the microporous aeration pipe frame 8, is located outside each peroxyalkaline hydrolysis tank 7. An air regulating valve 9 is installed between the Roots blower 10 and the microporous aeration pipe frame 8. An alkaline hydrolysis sludge pump 11 is located between the peroxyalkaline hydrolysis tank 7 and the wastewater equalization tank 13. pH sensors 6 are installed inside both the wastewater equalization tank 13 and the peroxyalkaline hydrolysis tank 7. A dosing device 5 is located outside both the wastewater equalization tank 13 and the peroxyalkaline hydrolysis tank 7. A pH controller 12, connected to the pH sensor 6, is located between the dosing device 5 and the pH sensor 6. Dosing valves 4 are located between the dosing device 5 and the wastewater equalization tank 13, and between the dosing device 5 and the peroxyalkaline hydrolysis tank 7. A sludge discharge pump 25 is installed between the thickening tank 24 and the peroxyalkaline hydrolysis tank 7. A sludge dewatering machine 27 is installed between the sludge discharge pump 25 and the peroxyalkaline hydrolysis tank 7. A sludge discharge valve 26 is installed between the sludge dewatering machine 27 and the sludge discharge pump 25. Sludge valves 2 are installed between the sewage tank 1 and the sewage equalization tank 13, between the activated sludge to the sewage treatment system 3 and the sewage lift pump 18, between the activated sludge to the sewage treatment system 3 and the peroxyalkaline hydrolysis tank 7, between the peroxyalkaline hydrolysis tank 7 and the alkali hydrolysis sludge pump 11, between the alkali hydrolysis sludge pump 11 and the sewage equalization tank 13, and between the sewage equalization tank 13 and the sewage lift pump 18.

[0023] The concentrated sludge in thickening tank 24 is discharged through sludge discharge valve 26 to sludge filter press dryer 27 for drying treatment. The remaining sludge water is discharged through sludge discharge pump 25 to peroxyalkaline decomposition tank 7. Two peroxyalkaline decomposition tanks 7 are set up and used alternately to form continuous production. At the bottom of peroxyalkaline decomposition tank 7, a microporous aeration pipe frame 8 is installed. Compressed air from Roots blower 10 is delivered to the microporous aeration pipe frame 8 through air regulating valve 9, and enters the wastewater in the form of a large number of fine bubbles, increasing the dissolved oxygen content in the wastewater. Under the vigorous agitation of a large amount of compressed air, the activated sludge flocs are in a suspended state, and the dissolved oxygen value is maintained above 8 mg / L. Under the action of excessive oxygen, the activated sludge undergoes excessive oxidation, causing its flocculent aggregation and sedimentation performance to deteriorate and disintegrate.

[0024] Simultaneously, the pH sensor 6 in the peroxy-alkali hydrolysis tank 7 measures the pH value of the solution in the tank 7. The pH controller 12 controls the dosing device 5 to add the prepared sodium hydroxide solution, adjusting the pH value of the peroxy-alkali hydrolysis tank 7 to be greater than 11. After 12 hours of peroxy-alkali hydrolysis, the sludge is pumped into the wastewater equalization tank 13 by the alkali hydrolysis sludge pump 11. Based on the analysis of COD, TN, NH3_N, TP, and other data, the solution is then adjusted according to the ratio of C:N:P = 500:5:1. The proportion of influent to the wastewater equalization tank 1 and the peroxyalkaline hydrolysis tank 7 is adjusted to meet the nutrient requirements of anaerobic biochemical treatment. The wastewater equalization tank is equipped with a temperature sensor 17. The temperature regulating valve 15 heats the wastewater in the wastewater equalization tank 13 to 35-38°C using steam based on the real-time temperature measured by the temperature sensor 17 and the internal set temperature value. The pH controller 12 controls the dosing device 5 to adjust the pH value of the wastewater equalization tank 13 to 7-9 based on the detection value of the pH sensor 6, so that it meets the influent water quality requirements of the biochemical tank. After being mixed evenly by the mixer 16, the wastewater enters the activated sludge to the wastewater treatment system 3 via the wastewater lift pump 18, completing the circulation of the peroxyalkaline hydrolysis sludge.

[0025] In summary, this wastewater treatment equipment for the residual activated sludge undergoing alkaline hydrolysis is characterized by simple operation and control, flexible operation, energy saving and environmental protection, and a simple structure, facilitating continuous production. It achieves low-cost, harmless, and volume-reduced treatment of sludge.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A wastewater treatment equipment for the alkaline hydrolysis of excess activated sludge, characterized in that: The system includes a sewage tank (1) and an activated sludge to sewage treatment system (3). A sewage lift pump (18) is provided between the sewage tank (1) and the activated sludge to sewage treatment system (3) and is connected to the sewage tank (1) and the activated sludge to sewage treatment system (3) by a pipeline. A sewage equalization tank (13) is provided between the sewage lift pump (18) and the sewage tank (1). Several peroxyalkaline hydrolysis tanks (7) are connected in parallel by pipelines between the activated sludge to sewage treatment system (3) and the sewage equalization tank (13). An alkaline hydrolysis sludge pump (11) is provided between the peroxyalkaline hydrolysis tank (7) and the sewage equalization tank (13).

2. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 1, characterized in that: The activated sludge wastewater treatment system (3) includes an external discharge tank (23) and a thickening tank (24). The thickening tank (24) and the wastewater lift pump (18) are connected in sequence to an anaerobic tank (19), an anoxic tank (20), an aerobic tank (21) and a sedimentation tank (22).

3. The wastewater treatment wastewater residual activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 2, characterized in that: A sludge pump (25) is provided between the thickening tank (24) and the peroxyalkaline hydrolysis tank (7).

4. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 3, characterized in that: A sludge dewatering machine (27) is provided between the sludge pump (25) and the peroxyalkaline hydrolysis tank (7), and a sludge dewatering valve (26) is provided between the sludge dewatering machine (27) and the sludge pump (25).

5. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 1, characterized in that: The sewage regulating tank (13) is equipped with a mixer (16), a temperature sensor (17) is installed inside the sewage regulating tank (13), a steam conveying pipe (14) is installed on the sewage regulating tank (13), and a temperature regulating valve (15) connected to the temperature sensor (17) is installed on the steam conveying pipe (14).

6. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 1, characterized in that: Wastewater valves (2) are provided between the wastewater tank (1) and the wastewater equalization tank (13), between the activated sludge wastewater treatment system (3) and the wastewater lift pump (18), between the activated sludge wastewater treatment system (3) and the peroxyalkaline hydrolysis tank (7), between the peroxyalkaline hydrolysis tank (7) and the alkali hydrolysis sludge pump (11), between the alkali hydrolysis sludge pump (11) and the wastewater equalization tank (13), and between the wastewater equalization tank (13) and the wastewater lift pump (18).

7. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 1, characterized in that: A pH sensor (6) is installed in both the wastewater equalization tank (13) and the peroxyalkaline hydrolysis tank (7). A dosing device (5) is installed on the outside of the wastewater equalization tank (13) and the peroxyalkaline hydrolysis tank (7). A pH controller (12) connected to the pH sensor (6) is installed between the dosing device (5) and the pH sensor (6). A dosing valve (4) is installed between the dosing device (5) and the wastewater equalization tank (13) and between the dosing device (5) and the peroxyalkaline hydrolysis tank (7).

8. The wastewater treatment waste activated sludge peroxyalkaline hydrolysis treatment equipment according to claim 1, characterized in that: Each of the above-mentioned peroxyalkaline hydrolysis tanks (7) is equipped with a microporous aeration pipe frame (8). A Roots blower (10) connected to the microporous aeration pipe frame (8) is provided on the outside of the peroxyalkaline hydrolysis tank (7). An air regulating valve (9) is provided between the Roots blower (10) and the microporous aeration pipe frame (8).

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