Low-temperature wastewater anaerobic treatment integrated system

Abstract

The utility model discloses a low-temperature wastewater anaerobic treatment integrated system which comprises a regulating tank, a heating tank and a reaction tank, the adjusting tank is provided with an acid-alkali liquid inlet pipe, a dosing pipe and a first stirring mechanism, so that the water quality of wastewater is adjusted; a steam pipe at the bottom of the heating pool is matched with a temperature sensor and a control module to accurately control the temperature, and a coil pipe section of a steam outlet pipe realizes waste heat recovery; the reaction tank is connected with a calcified sludge circulating pipe, and the calcified sludge is subjected to multi-stage treatment through a gravity separation tank and a centrifugal separation tank; a mixing mechanism and a scale inhibitor adding pipe are arranged on a pipeline between the heating tank and the reaction tank, so that the pipeline is prevented from scaling. Through cooperative work of multiple modules, the problems of low anaerobic treatment efficiency, difficulty in calcified sludge treatment, easiness in scaling of equipment and the like in a low-temperature environment are solved, and the device has the characteristics of high treatment efficiency, low energy consumption and stability in operation, and can be widely applied to the field of low-temperature wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a low-temperature anaerobic wastewater treatment integrated system. Background Technology

[0002] In the field of wastewater treatment, anaerobic treatment technology is widely used for treating high-concentration organic wastewater due to its advantages such as low energy consumption, low sludge production, and recoverable energy (e.g., methane). However, when the treatment temperature is below 25℃, the activity of anaerobic microorganisms decreases significantly, leading to a slowdown in reaction rate, reduced treatment efficiency, and even unstable treatment results. Simultaneously, the large amounts of calcium and magnesium ions in the wastewater readily combine with carbonate and phosphate ions during the anaerobic reaction to form insoluble salts, causing scaling on pipes and equipment. This not only affects the normal operation of the system but also increases equipment maintenance costs and energy consumption.

[0003] Existing low-temperature anaerobic wastewater treatment systems generally suffer from the following shortcomings: First, they lack effective regulation of wastewater quality, failing to specifically improve the survival conditions of anaerobic microorganisms in low-temperature environments; second, temperature control methods are limited, making it difficult to accurately maintain the optimal temperature range for anaerobic reactions; third, their capacity for treating calcified sludge is weak, often relying on single sedimentation or separation methods, which cannot efficiently remove calcified sludge, leading to sludge accumulation within the system and affecting reaction efficiency; fourth, insufficient scale inhibition measures in pipelines and equipment make them prone to blockage due to scaling, reducing system operational stability and service life. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an integrated system for anaerobic treatment of low-temperature wastewater, which can solve the technical problems of insufficient water quality regulation, inaccurate temperature control, inefficient treatment of calcified sludge, and easy scaling of pipelines and equipment in existing low-temperature anaerobic wastewater treatment systems, resulting in low treatment efficiency and unstable operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a low-temperature wastewater anaerobic treatment integrated system, including an equalization tank, a heating tank and a reaction tank, wherein the equalization tank is provided with an acid inlet pipe and a dosing pipe, and a first stirring mechanism is provided inside the equalization tank, and the equalization tank is connected to the heating tank through a first conveying pipe;

[0006] The heating tank is equipped with a steam pipe at the bottom, and the heating tank is connected to the reaction tank through a second conveying pipe;

[0007] The reaction tank is equipped with a calcified sludge circulation pipe, and the calcified sludge circulation pipe is equipped with a gravity separation tank and a centrifugal separation tank.

[0008] A mixing mechanism is provided on the pipeline between the heating tank and the reaction tank, and a scale inhibitor addition pipe is provided on the mixing mechanism.

[0009] In a preferred embodiment, the side wall of the regulating tank is provided with a physicochemical water pipe and a sewage pipe;

[0010] The equalization tank is also equipped with an acid inlet pipe and a chemical dosing pipe on its side wall.

[0011] In a preferred embodiment, a first conveying pump is provided on the first conveying pipe, a second conveying pump is provided on the second conveying pipe, and a third conveying pump is provided at the input end of the calcified sludge circulation pipe.

[0012] In a preferred embodiment, the scale inhibitor addition pipe and mixing mechanism are disposed between the second delivery pump and the input end of the second delivery pipe.

[0013] In a preferred embodiment, a steam flow control valve is provided on the steam pipe, a temperature sensor is provided on the side wall of the heating pool, the temperature sensor is connected to the control module, and the control module is also connected to the steam flow control valve.

[0014] In a preferred embodiment, the heating tank is provided with a steam outlet pipe at the top, a coil section is provided on the steam outlet pipe, the coil section passes through the water tank, a water inlet pipe is provided at the lower part of the side wall of the water tank, and a water outlet pipe is provided at the upper part of the side wall of the water tank.

[0015] In a preferred embodiment, the calcified sludge circulation pipe is provided with a gravity separation tank and a centrifugal separation tank in sequence along the conveying direction. The bottom of the gravity separation tank and the centrifugal separation tank is provided with a calcified sludge outlet pipe. A fourth conveying pump is provided between the centrifugal separation tank and the output end of the calcified sludge circulation pipe.

[0016] In a preferred embodiment, the mixing mechanism includes a static mixer and a dynamic stirring section, wherein a second stirring mechanism is provided within the dynamic stirring section.

[0017] In a preferred embodiment, the static mixer is an SK-type static mixer.

[0018] The low-temperature anaerobic wastewater treatment integrated system provided by this utility model, by adopting the above-described structure, has the following beneficial effects:

[0019] (1) By precisely regulating the water quality through the equalization tank, suitable living conditions are created for anaerobic microorganisms in low temperature environment, significantly improving microbial activity and accelerating the anaerobic reaction rate. At the same time, the intelligent temperature control system and waste heat recovery device of the heating tank can achieve precise control of wastewater temperature and use steam waste heat to preheat the influent, effectively reducing the energy consumption of system operation.

[0020] (2) The calcified sludge circulation pipe is connected in series with the gravity separation tank and the centrifugal separation tank to form a multi-stage separation mechanism, which greatly improves the separation efficiency of calcified sludge and reduces the accumulation of sludge in the system;

[0021] (3) The scale inhibitor addition pipe and mixing mechanism can effectively ensure the uniform mixing of sewage and scale inhibitor, inhibit scaling of pipes and equipment, reduce maintenance frequency, and ensure long-term stable operation of the system. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the hybrid mechanism structure of this utility model.

[0025] In the diagram: 1. Equalization tank; 2. Heating tank; 3. Reaction tank; 4. Acid inlet pipe; 5. Dosing pipe; 6. Physicochemical water pipe; 7. Sewage pipe; 8. First stirring mechanism; 9. First conveying pipe; 10. First conveying pump; 11. Steam pipe; 111. Steam flow control valve; 12. Temperature sensor; 13. Control module; 14. Steam outlet pipe; 141. Coil section; 15. Water tank; 151. Inlet pipe; 152. Outlet pipe; 16. Second conveying pipe; 17. Second conveying pump; 18. Scale inhibitor addition pipe; 19. Mixing mechanism; 20. Calcified sludge circulation pipe; 21. Third conveying pump; 22. Gravity separation tank; 23. Centrifugal separation tank; 24. Fourth conveying pump; 25. Static mixer; 26. Dynamic stirring section; 27. Second stirring mechanism. Detailed Implementation

[0026] like Figure 1-2 In the present invention, a low-temperature anaerobic wastewater treatment integrated system includes an equalization tank 1, a heating tank 2 and a reaction tank 3. The equalization tank 1 is provided with an acid inlet pipe 4 and a dosing pipe 5. The equalization tank 1 is provided with a first stirring mechanism 8. The equalization tank 1 is connected to the heating tank 2 through a first conveying pipe 9.

[0027] The bottom of the heating pool 2 is provided with a steam pipe 11, and the heating pool 2 is connected to the reaction pool 3 through a second conveying pipe 16.

[0028] The reaction tank 3 is equipped with a calcified sludge circulation pipe 20, and the calcified sludge circulation pipe 20 is equipped with a gravity separation tank 22 and a centrifugal separation tank 23.

[0029] A mixing mechanism 19 is provided on the pipeline between the heating tank 2 and the reaction tank 3, and a scale inhibitor addition pipe 18 is provided on the mixing mechanism 19.

[0030] In a preferred embodiment, the side wall of the regulating tank 1 is provided with a physical and chemical water pipe 6 and a sewage pipe 7;

[0031] The equalization tank 1 is also equipped with an acid inlet pipe 4 and a chemical dosing pipe 5 on its side wall.

[0032] In a preferred embodiment, a first conveying pump 10 is provided on the first conveying pipe 9, a second conveying pump 17 is provided on the second conveying pipe 16, and a third conveying pump 21 is provided at the input end of the calcified sludge circulation pipe 20.

[0033] In a preferred embodiment, the scale inhibitor addition pipe 18 and the mixing mechanism 19 are disposed between the second delivery pump 17 and the input end of the second delivery pipe 16.

[0034] In a preferred embodiment, the steam pipe 11 is equipped with a steam flow control valve 111, and the side wall of the heating pool 2 is equipped with a temperature sensor 12. The temperature sensor 12 is connected to the control module 13, and the control module 13 is also connected to the steam flow control valve 111.

[0035] In a preferred embodiment, the heating tank 2 is provided with a steam outlet pipe 14 at the top, a coil section 141 is provided on the steam outlet pipe 14, the coil section 141 is provided through the water tank 15, a water inlet pipe 151 is provided at the lower part of the side wall of the water tank 15, and a water outlet pipe 152 is provided at the upper part of the side wall of the water tank 15.

[0036] In a preferred embodiment, the calcified sludge circulation pipe 20 is provided with a gravity separation tank 22 and a centrifugal separation tank 23 in sequence along the conveying direction. The bottom of the gravity separation tank 22 and the centrifugal separation tank 23 is provided with a calcified sludge outlet pipe. A fourth conveying pump 24 is provided between the centrifugal separation tank 23 and the output end of the calcified sludge circulation pipe 20.

[0037] In a preferred embodiment, the mixing mechanism 19 includes a static mixer 25 and a dynamic stirring section 26, wherein a second stirring mechanism 27 is provided within the dynamic stirring section 26.

[0038] In a preferred embodiment, the static mixer 25 is an SK-type static mixer.

[0039] The novel low-temperature anaerobic wastewater treatment integrated system disclosed herein has the following working process and principle:

[0040] The low-temperature wastewater to be treated (physicochemical influent and aerobic secondary sedimentation tank effluent) enters the equalization tank 1 through the physicochemical water pipe 6 and the sewage pipe 7. Since the aerobic secondary sedimentation tank effluent has high alkalinity and high pH value, acid (HCl) is added through the acid inlet pipe 4 to adjust the pH value to 6.5-7.5. At the same time, nutrients (N, P) are added through the chemical dosing pipe 5. The first stirring mechanism 8 stirs at a speed of 120 r / min for 15-20 min to ensure that the wastewater is fully mixed and uniform.

[0041] The adjusted wastewater is transported to the heating tank 2 by the first transfer pump 10. The temperature sensor 12 monitors the water temperature in real time. When the water temperature is below 35℃, the control module 13 opens the steam flow control valve 111 and introduces steam into the bottom of the heating tank 2 through the steam pipe 11 for heating. The steam that escapes enters the coil section 141 through the steam outlet pipe 14 and exchanges heat with the cold water in the water tank 15. The preheated water is discharged through the water outlet pipe 152 for recycling.

[0042] Wastewater heated to 35-38℃ is pumped to the second conveying pipe 16 via the second conveying pump 17. Simultaneously, scale inhibitor is added at a dosage of 5-8 mg / L via the scale inhibitor addition pipe 18. After the wastewater and scale inhibitor are fully mixed in the static mixer 25 and the dynamic stirring section 26, they enter the reaction tank 3 for anaerobic reaction. The calcified sludge produced by the reaction is pumped to the calcified sludge circulation pipe 20 via the third conveying pump 21. It first undergoes preliminary sedimentation separation in the gravity separation tank 22. The supernatant then enters the centrifugal separation tank 23 for secondary separation. The separated sludge is discharged through the bottom outlet pipe. The treated liquid is returned to the reaction tank 3 via the fourth conveying pump 24 to continue participating in the reaction.

Claims

1. A low-temperature wastewater anaerobic treatment integrated system, comprising an equalization tank (1), a heating tank (2), and a reaction tank (3), characterized in that: The regulating tank (1) is equipped with an acid inlet pipe (4) and a dosing pipe (5). The regulating tank (1) is equipped with a first stirring mechanism (8). The regulating tank (1) is connected to the heating tank (2) through a first conveying pipe (9). The heating tank (2) is equipped with a steam pipe (11) at the bottom, and the heating tank (2) is connected to the reaction tank (3) through a second conveying pipe (16); The reaction tank (3) is equipped with a calcified sludge circulation pipe (20), and the calcified sludge circulation pipe (20) is equipped with a gravity separation tank (22) and a centrifugal separation tank (23). A mixing mechanism (19) is provided on the pipeline between the heating tank (2) and the reaction tank (3), and a scale inhibitor addition pipe (18) is provided on the mixing mechanism (19).

2. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1, characterized in that: The regulating tank (1) is provided with a physical and chemical water pipe (6) and a sewage pipe (7) on its side wall. The regulating tank (1) is also provided with an acid inlet pipe (4) and a dosing pipe (5) on its side wall.

3. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1, characterized in that: The first conveying pipe (9) is equipped with a first conveying pump (10), the second conveying pipe (16) is equipped with a second conveying pump (17), and the input end of the calcified sludge circulation pipe (20) is equipped with a third conveying pump (21).

4. The integrated system for low-temperature anaerobic wastewater treatment according to claim 3, characterized in that: The scale inhibitor addition pipe (18) and mixing mechanism (19) are located between the second delivery pump (17) and the input end of the second delivery pipe (16).

5. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1, characterized in that: The steam pipe (11) is equipped with a steam flow control valve (111), and the heating pool (2) is equipped with a temperature sensor (12) on its side wall. The temperature sensor (12) is connected to the control module (13), and the control module (13) is also connected to the steam flow control valve (111).

6. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1 or 5, characterized in that: The heating pool (2) is provided with a steam outlet pipe (14) at the top, and a coil section (141) is provided on the steam outlet pipe (14). The coil section (141) passes through the water tank (15). A water inlet pipe (151) is provided at the lower part of the side wall of the water tank (15), and a water outlet pipe (152) is provided at the upper part of the side wall of the water tank (15).

7. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1, characterized in that: The calcified sludge circulation pipe (20) is provided with a gravity separation tank (22) and a centrifugal separation tank (23) in sequence along the conveying direction. The bottom of the gravity separation tank (22) and the centrifugal separation tank (23) is provided with a calcified sludge outlet pipe. A fourth conveying pump (24) is provided between the centrifugal separation tank (23) and the output end of the calcified sludge circulation pipe (20).

8. The integrated system for low-temperature anaerobic wastewater treatment according to claim 1, characterized in that: The mixing mechanism (19) includes a static mixer (25) and a dynamic stirring section (26), and a second stirring mechanism (27) is provided in the dynamic stirring section (26).

9. The integrated system for low-temperature anaerobic wastewater treatment according to claim 8, characterized in that: The static mixer (25) is an SK type static mixer.

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