Hydrolysis acidification system for improving biodegradability of sewage

Abstract

The utility model discloses a hydrolytic acidification system for improving biodegradability of sewage, and belongs to the technical field of sewage treatment. The system comprises a dosing tank, COD online equipment, TN online equipment, TP online equipment, a PLC (Programmable Logic Controller), a nitrogen storage tank, a phosphorus storage tank and a hydrolysis acidification tank. The system effectively solves the problem of imbalance of carbon, nitrogen and phosphorus in the hydrolytic acidification system by additionally arranging a nitrogen source and phosphorus source dosing device, improves the microbial activity and strengthens the hydrolytic acidification effect. The water distribution cover is arranged above the water distribution disc of the hydrolysis acidification pool, and the water flow from the water distribution disc is unloaded through the water distribution cover, so that the problem of impact on a sludge layer can be effectively solved, and the contact time of microorganisms in the hydrolysis acidification pool and refractory organic matters is ensured. The inclined plate is additionally arranged above the suspension layer, so that the problem of sludge loss can be effectively solved, and the total amount of microorganisms of the hydrolytic acidification system is increased. The system is low in operation cost, safe and reliable in operation and free of secondary pollution, the hydrolytic acidification effect can be greatly improved, and then the biodegradability of sewage is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a hydrolysis acidification system for improving the biodegradability of sewage. Background Art

[0002] At present, most industrial park sewage treatment plants are facing the problem of poor biodegradability of incoming water. Some water plants have an influent B / C ratio even lower than 0.1. In order to maintain the sludge activity of the biochemical system of the sewage plant, carbon sources are often added to the front end of the biochemical system, which greatly increases the operating costs. In order to solve the above problems, sewage plants often add a hydrolysis acidification system before the biochemical system to treat the difficult-to-degrade organic matter into degradable or easily degradable organic matter through hydrolysis acidification, so as to improve the B / C ratio of the front end of the biochemical system and improve the biodegradability of the hydrolysis acidification system. However, the hydrolysis acidification system has the following deficiencies during operation: 1. Many industrial park drainages contain almost no TN and TP, resulting in an imbalance in the C, N, and P ratio of the sewage plant influent, causing slow proliferation of microorganisms in the hydrolysis acidification system, and ultimately poor hydrolysis acidification effect. Second, the real effect of the hydrolysis acidification system is the microorganisms in the sludge layer at the bottom of the pool. At present, the water discharged from the water distributor in most hydrolysis acidification pools will impact the sludge in the sludge layer, causing the sludge in the sludge layer to become loose, shortening the contact time between microorganisms and organic matter, and ultimately worsening the hydrolysis acidification effect. Third, during the operation of the hydrolysis acidification system, some sludge will float up and flow out of the water outlet, resulting in less sludge in the hydrolysis acidification system, and ultimately worsening the hydrolysis acidification effect. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a hydrolysis acidification system which can greatly improve the biodegradability of sewage.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A hydrolysis acidification system for improving the biodegradability of sewage, wherein a water inlet pipe is connected to a water inlet of a dosing tank, a water outlet of the dosing tank is connected to a water distribution pipe of a hydrolysis acidification tank by a dosing tank outlet pipe, and a water outlet trough is arranged above the hydrolysis acidification tank, and the water outlet trough is connected to the water outlet pipe;

[0006] The dosing tank is provided with an agitator, a COD online device, a TN online device, and a TP online device; the nitrogen storage tank is connected to the nitrogen inlet of the dosing tank by a pipeline through a nitrogen pump, and the phosphorus storage tank is connected to the phosphorus inlet of the dosing tank by a pipeline through a phosphorus pump;

[0007] The hydrolysis acidification tank is divided into a sludge layer, a suspension layer, a sedimentation layer and a clarification layer from bottom to top. The sedimentation layer is provided with an inclined plate for sedimentation of sludge; a water distribution pan is provided on the water distribution pipe, and a water distribution cover is provided above the water distribution pan;

[0008] The system also includes a PLC controller, which is electrically connected to the COD online device, the TN online device, and the TP online device.

[0009] A nitrogen pump frequency converter is installed on the nitrogen pump, and the nitrogen pump frequency converter is electrically connected to the PLC controller.

[0010] A phosphorus pump frequency converter is installed on the phosphorus pump, and the phosphorus pump frequency converter is electrically connected to the PLC controller.

[0011] The nitrogen storage tank is filled with urea as a medicine, and the phosphorus storage tank is filled with potassium dihydrogen phosphate as a medicine.

[0012] A lifting pump is arranged on the water outlet pipe of the dosing tank.

[0013] The utility model has the following beneficial effects:

[0014] In the utility model, by adding precise dosing devices for nitrogen and phosphorus sources, the problem of imbalance of carbon, nitrogen and phosphorus in the hydrolysis acidification system can be effectively solved, the activity of microorganisms can be improved, and the hydrolysis acidification effect can be strengthened. By arranging a water distribution cover above the water distribution tray of the hydrolysis acidification tank, the water flow from the water distribution tray is unloaded through the water distribution cover, which can effectively solve the problem of impact on the sludge layer, thereby ensuring the contact time between the microorganisms in the hydrolysis acidification tank and the difficult-to-degrade organic matter. By adding an inclined plate above the suspended layer, the problem of sludge loss in the hydrolysis acidification tank can be effectively solved, thereby increasing the total amount of microorganisms in the hydrolysis acidification system. The device has low operating costs, safe and reliable operation, no secondary pollution, can greatly improve the hydrolysis acidification effect, and thus greatly improve the biodegradability of sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a hydrolysis and acidification system for improving the biodegradability of sewage proposed by the utility model.

[0016] Legend: 1. Water inlet pipe, 2. Water inlet pump, 3. Water inlet valve, 4. Dosing tank, 4a. Phosphorus inlet, 4b. Nitrogen inlet, 4c. Water inlet, 4d. Water outlet, 5. Dosing tank outlet pipe, 6. Lifting pump, 7. Water distribution pipe, 8. Water distribution tray, 9. Water distribution cover, 10. Hydrolysis acidification tank, 10a. Sludge layer, 10b. Suspended layer, 10c. Sedimentation layer, 10d. Clarification layer, 10e. Inclined plate, 11. Water outlet trough, 12. Acidification tank outlet pipe, 13. Nitrogen storage tank, 14. Nitrogen pump inverter, 15. Nitrogen pump, 16. Phosphorus storage tank, 17. Phosphorus pump, 18. Phosphorus pump inverter, 19. PLC controller, 20. COD online equipment, 21. TN online equipment, 22. TP online equipment, 23. Agitator. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] A hydrolysis acidification system that can greatly improve the biodegradability of sewage includes a dosing tank, a COD online device, a TN online device, a TP online device, a PLC controller, a nitrogen storage tank, a phosphorus storage tank, and a hydrolysis acidification tank. The water inlet end of the dosing tank is connected to the water outlet end of the water inlet pipe, and a water inlet pump is installed on the water inlet pipe. The outlet end of the first sampling tube is connected to the COD online device sampling port, and the inlet end of the first sampling tube is deep below the liquid level of the dosing tank. The outlet end of the second sampling tube is connected to the TN online device sampling port, and the inlet end of the second sampling tube is deep below the liquid level of the dosing tank. The outlet end of the third sampling tube is connected to the TP online device sampling port, and the inlet end of the third sampling tube is deep below the liquid level of the dosing tank. The input end of the first signal line is connected to the output end of the COD online device, and the output end of the first signal line is connected to the input end of the PLC controller. The input end of the second signal line is connected to the output end of the TN online device, and the output end of the second signal line is connected to the input end of the PLC controller. The third signal line input end is connected to the TP online device output end, and the third signal line output end is connected to the PLC controller input end. The first connecting pipe output end is arranged at the nitrogen inlet of the dosing tank, and the first connecting pipe input end is connected to the nitrogen storage tank output end; a nitrogen pump is installed on the first connecting pipe, and a nitrogen pump frequency converter is installed on the nitrogen pump; the LC controller output end is connected to the fourth signal line input end, and the fourth signal line output end is connected to the nitrogen pump frequency converter input end. The second connecting pipe output end is arranged at the phosphorus inlet of the dosing tank, and the second connecting pipe input end is connected to the phosphorus storage tank output end; a phosphorus pump is installed on the second connecting pipe, and a phosphorus pump frequency converter is installed on the phosphorus pump; the PLC controller output end is connected to the fifth signal line input end, and the fifth signal line output end is connected to the nitrogen pump frequency converter input end.

[0019] An agitator is installed above the dosing tank, and the impeller on the agitator is set at the bottom of the dosing tank. The outlet end of the dosing tank is connected to the inlet end of the dosing tank outlet pipe, and the outlet end of the dosing tank outlet pipe is connected to the inlet end of the water distribution pipe in the hydrolysis acidification tank; a lifting pump is installed on the dosing tank outlet pipe. Multiple water distribution trays are installed on the water distribution pipe, and a water distribution cover is installed above each water distribution tray. The sludge layer is above the water distribution pipe, the suspended layer is above the sludge layer, the suspended layer is above the sedimentation layer, and the sedimentation layer is installed with an inclined plate; the sedimentation layer is above the clarification layer. A water outlet trough is installed on one side of the upper part of the hydrolysis acidification tank. A water outlet weir plate is installed on the water outlet trough. A water outlet weir is installed on the water outlet weir plate. The outlet end of the hydrolysis acidification tank is connected to the inlet end of the water outlet pipe. Example

[0020] Figure 1 A hydrolysis acidification system for improving the biodegradability of sewage is shown, including a dosing tank 4, a COD online device 20, a TN online device 21, a TP online device 22, a PLC controller 19, a nitrogen storage tank 13, a phosphorus storage tank 16, and a hydrolysis acidification tank 10. The sewage enters the dosing tank 4 through the water inlet pipe 1 through the water inlet pump 2. The opening or closing of the water inlet pipe 1 is controlled by opening and closing the valve. The agitator 23 can fully stir the added agent and sewage through the rotation of the impeller.

[0021] The COD online device 20, the TN online device 21, and the TP online device 22 are sampled through the first sampling tube, the second sampling tube, and the third sampling tube, respectively. The data on the COD online device 20, the TN online device 21, and the TP online device 22 are respectively fed back to the PLC controller 19 through the first signal line, the second signal line, and the first signal line input line in real time. The PLC controller 19 controls the nitrogen pump inverter 14 and the phosphorus pump inverter 18 through the fourth signal line and the fifth signal line according to the existing internal program, thereby controlling the flow of the nitrogen pump 15 and the phosphorus pump 17. The internal program dosing logic of the PLC controller 194 is COD / TN=60:1, COD / TP=300:1. The urea in the nitrogen storage tank 13 and the potassium dihydrogen phosphate in the phosphorus storage tank 16 are respectively transported to the dosing tank 4 through the nitrogen pump 14 and the phosphorus pump 17 via the first connecting pipe and the second connecting pipe. The opening and closing of the valve are used to control the opening or closing of the first connecting pipe and the second connecting pipe. The sewage in the dosing tank 4 enters the hydrolysis acidification tank 10 through the dosing tank outlet pipe 5 through the lifting pump 6. The opening and closing of the dosing tank outlet pipe 5 is controlled by the opening and closing of the valve. The sewage entering the hydrolysis acidification tank 10 is evenly distributed through the water distribution tray 8 on the water distribution pipe 7. The water flow from the water distribution tray 8 is unloaded through the water distribution cover 9 to reduce the impact of the incoming water on the sludge layer 10a. In the sludge layer 10a, the hydrolytic bacteria in the sludge will hydrolyze the difficult-to-degrade organic matter in the sewage into small molecular organic matter, and the acidifying bacteria will decompose the small molecular organic matter in the sewage into easily degradable organic matter, thereby increasing the specific gravity of the easily degradable organic matter in the sewage, and then improving the biodegradability of the sewage. The sewage continues to rise after leaving the sludge layer 10a, and at the same time, a small amount of sludge will be brought to the suspension layer 10b. In the suspension layer 10b, part of the sludge will fall by gravity and return to the sludge layer 10a. Another part of the sludge will rise to the sedimentation layer 10c with the sewage. The sedimentation layer 10c is provided with an inclined plate 10e, and the sewage will continue to flow upward along the inclined plate 10e, while the sludge will settle under the friction of the inclined plate 10e. After passing through the inclined plate 10e, the sewage enters the clarification layer 10d, and the sewage flows into the outlet tank 11 from the outlet weir on the outlet weir plate, and finally flows out from the outlet pipe 12.

[0022] Working principle: When using this device, first open the valve and the water inlet pump 4 at the same time to start water inletting into the dosing tank 4. Then, turn on the COD online device 20, the TN online device 21, the TP online device 22, the PLC controller 19, the nitrogen pump 14, the phosphorus pump 17, and the agitator 23 at the same time to accurately add medicine to balance the carbon, nitrogen, and phosphorus ratios in the system. At the same time, open the valve and the lifting pump 6 to evenly distribute the regulated sewage through the water distribution tray 8 on the water distribution pipe 7. In the sludge layer 10a, the hydrolytic bacteria in the sludge will hydrolyze the difficult-to-degrade organic matter in the sewage into small molecular organic matter, and the acidifying bacteria will decompose the small molecular organic matter in the sewage into easily degradable organic matter, thereby increasing the proportion of easily degradable organic matter in the sewage, and then improving the biodegradability of the sewage. The sewage continues to rise after leaving the sludge layer 10a, and at the same time, a small amount of sludge will be brought to the suspended layer 10b. In the suspended layer 10b, a part of the sludge will fall by gravity and return to the sludge layer 10a. Another part of the sludge will rise to the sedimentation layer 10c along with the sewage. An inclined plate 10e is provided in the sedimentation layer 10c, and the sewage will continue to flow upward along the inclined plate 10e, while the sludge will settle under the friction of the inclined plate 10e. After the sewage passes through the inclined plate 10e, it enters the clarification layer 10d, and the sewage flows into the outlet tank 11 from the outlet weir on the outlet weir plate, and finally flows out from the outlet pipe 12 and is transported to the subsequent process equipment. This device can greatly improve the biodegradability of sewage, save a large amount of carbon source reagents, operate safely and reliably, have low operating costs, and no secondary pollution is generated.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrolysis acidification system for improving the biodegradability of sewage, characterized by: The water inlet pipe (1) is connected to the water inlet (4c) of the dosing tank (4); the water outlet (4d) of the dosing tank (4) is connected to the water distribution pipe (7) of the hydrolysis acidification tank (10) via the dosing tank outlet pipe (5); a water outlet trough (11) is provided above the hydrolysis acidification tank (10); and the water outlet trough (11) is connected to the water outlet pipe (12); The dosing tank (4) is provided with an agitator (23), a COD online device (20), a TN online device (21), and a TP online device (22); the nitrogen storage tank (13) is connected to the nitrogen inlet (4b) of the dosing tank (4) through a pipeline via a nitrogen pump (15); the phosphorus storage tank (16) is connected to the phosphorus inlet (4a) of the dosing tank (4) through a pipeline via a phosphorus pump (17); The hydrolysis acidification tank (10) is divided into a sludge layer (10a), a suspension layer (10b), a sedimentation layer (10c) and a clarifying layer (10d) from bottom to top, and an inclined plate (10e) for sedimenting sludge is provided in the sedimentation layer (10c); a water distribution tray (8) is provided on the water distribution pipe (7), and a water distribution cover (9) is provided above the water distribution tray (8); The system also includes a PLC controller (19), and the PLC controller (19) is electrically connected to the COD online device (20), the TN online device (21), and the TP online device (22).

2. A hydrolysis acidification system for improving the biodegradability of sewage according to claim 1, characterized in that: The nitrogen pump (15) is equipped with a nitrogen pump frequency converter (14), and the nitrogen pump frequency converter (14) is electrically connected to a PLC controller (19).

3. A hydrolysis acidification system for improving the biodegradability of sewage according to claim 1, characterized in that: A phosphorus pump frequency converter (18) is installed on the phosphorus pump (17), and the phosphorus pump frequency converter (18) is electrically connected to a PLC controller (19).

4. The hydrolysis acidification system for improving the biodegradability of sewage according to claim 1, characterized in that: The nitrogen storage tank (13) is filled with urea as a reagent, and the phosphorus storage tank (16) is filled with potassium dihydrogen phosphate as a reagent.

5. The hydrolysis acidification system for improving the biodegradability of sewage according to claim 1, characterized in that: A lifting pump (6) is provided on the water outlet pipe (5) of the dosing tank.

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