A tunnel construction sewage treatment system containing oil slick scum

Abstract

The application provides a tunnel construction sewage treatment system containing oil slick and scum, relates to the technical field of tunnel engineering environmental protection equipment, and comprises sand setting and oil separating pools, a sewage collecting pool, a sludge reduction device, a conditioning pool, a regulating pool, a magnetic coagulation sewage purification device and a clear water pool connected in sequence. The application can adapt to the characteristics of large instantaneous fluctuation of tunnel water inflow, has strong impact load resistance, has more stable treatment effect when treating suspended solids and large pH fluctuation, can treat high-oil sewage, and the clear water pool performs sedimentation and purification on the clear water, so that the effluent water quality is higher.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology for tunnel engineering, and in particular to a wastewater treatment system for tunnel construction containing floating oil and slag. Background Technology

[0002] The main characteristics of tunnel wastewater are high levels of oil, high concentrations of suspended solids, and alkaline pollutants, along with significant fluctuations in water quality and quantity. Current tunnel wastewater treatment methods often employ temporary sedimentation tanks combined with chemical dosing systems, which have the following drawbacks:

[0003] 1. Tunnel water inflow is subject to large instantaneous fluctuations, and traditional treatment methods are weak in resisting impact loads;

[0004] 2. The treatment effect is unstable when there are suspended solids and large pH fluctuations;

[0005] 3. Unable to handle wastewater with high oil content.

[0006] Based on the analysis of the characteristics of tunnel wastewater, this application designs a wastewater treatment system for tunnel construction wastewater containing floating oil and slag, in order to solve at least one of the above-mentioned defects. Utility Model Content

[0007] In view of the above situation, the present invention provides a wastewater treatment system for tunnel construction containing floating oil and slag, which aims to solve at least one of the defects pointed out in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] This utility model provides a wastewater treatment system for tunnel construction containing floating oil and scum, comprising the following components connected in sequence:

[0010] Sedimentation and grease trap;

[0011] Wastewater in the sewage collection tank enters the sewage collection tank after the floating oil and scum in the sedimentation and grease trap are removed;

[0012] The sludge reduction device transforms high-concentration wastewater in the wastewater collection tank into low-concentration wastewater and concentrated sludge based on gravity sedimentation.

[0013] The conditioning tank is used to adjust the pH value of low-concentration wastewater to obtain a neutralized water sample, which then enters the conditioning tank.

[0014] The equalization tank is used to balance the amount of water entering the magnetic coagulation wastewater purification device;

[0015] The magnetic coagulation wastewater purification device is used to separate solids and liquids in wastewater from the equalization tank to obtain neutral sludge and clean water.

[0016] The clear water pool is used for sedimentation and purification of clear water.

[0017] In some embodiments of this utility model, the grit separator, the sewage collection tank, the conditioning tank, and the equalization tank are arranged in close succession, with a storage space between the equalization tank and the clear water tank. The sludge reduction device and the magnetic coagulation sewage purification device are installed in this storage space.

[0018] In some embodiments of this utility model, an emergency discharge ditch is also included, and the upper part of the regulating pool has an overflow outlet of the regulating pool; the emergency discharge ditch is arranged in the storage interval, one end of the emergency discharge ditch is connected to the overflow outlet of the regulating pool, and the other end is connected to the inlet of the clear water pool.

[0019] In some embodiments of this utility model, the clear water tank has multiple independent sedimentation cells, and each sedimentation cell is connected to overflow in sequence.

[0020] In some embodiments of this utility model, an emergency sewage tank is also included, and the sewage collection tank has an overflow outlet connected to the emergency sewage tank.

[0021] In some embodiments of this utility model, a solid-liquid separation device is also included, which is used to separate the deposited sludge at the bottom of the sludge reduction device into filtrate and sludge cake; the filtrate enters the sewage collection tank.

[0022] In some embodiments of this utility model, it further includes:

[0023] The second pH sensor is installed inside the conditioning tank;

[0024] The pH dosing device is used to add conditioning agents to the conditioning tank and is associated with a second pH sensor.

[0025] In some embodiments of this utility model, a PAC dosing device and a PAM dosing device are also included.

[0026] In some embodiments of this utility model, an air flotation machine is also included. The floating oil and scum dredged from the sedimentation tank are processed in the air flotation machine, and the resulting clean water is discharged to the conditioning tank.

[0027] In some embodiments of this utility model, the floating oil and scum dredged from the sludge reduction device are processed in an air flotation machine, and the resulting clean water is discharged into a conditioning tank.

[0028] The embodiments of this utility model have at least the following advantages or beneficial effects:

[0029] It can adapt to the characteristics of large instantaneous fluctuations in tunnel water inflow and has strong resistance to shock loads; it has a more stable treatment effect when suspended solids and pH fluctuate greatly; it can treat high-oil wastewater; the clear water tank precipitates and purifies the water, resulting in higher quality effluent.

[0030] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the wastewater treatment system for tunnel construction containing floating oil and slag.

[0033] Figure 2 This is a process flow diagram for this application.

[0034] icon:

[0035] 10-Sedimentation and grease trap, 11-First submersible sewage pump,

[0036] 20-Sewage collection tank; 21-Second submersible pump; 22-First agitator; 23-First pH meter; 24-First suspended solids meter; 25-Overflow notch.

[0037] 30 - Sludge reduction device

[0038] 40- Conditioning tank,

[0039] 50 - Equalization tank, 51 - Emergency discharge ditch

[0040] 60-Magnetic coagulation wastewater purification device,

[0041] 70 - Clear water tank, 71 - Settling tank unit,

[0042] 80-Air flotation machine,

[0043] 90-Solid-Liquid Separation Device

[0044] 100 - Emergency Sewage Tank, 101 - Fourth Submersible Sewage Pump

[0045] 110-PH dosing device, 120-PAC dosing device, 130-PAM dosing device. Detailed Implementation

[0046] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention.

[0047] In the description of the embodiments of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0048] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0049] The embodiments of this utility model will be described in detail below.

[0050] Example 1

[0051] See Figures 1-2 This embodiment provides a wastewater treatment system for tunnel construction containing floating oil and slag, comprising, in sequence: a sedimentation and oil separator 10, a wastewater collection tank 20, a sludge reduction device 30, a conditioning tank 40, an equalization tank 50, a magnetic coagulation wastewater purification device 60, and a clear water tank 70.

[0052] The sedimentation tank 10 is used for the initial sedimentation of solid particles in sewage and to allow oil to float on the water surface to form sludge. Sewage from the tunnel flows into the sedimentation tank 10 through the main sewage ditch. The sedimentation tank 10 contains a first submersible pump 11.

[0053] Wastewater collection tank 20 is used to collect wastewater from the grit and grease trap 10. After removing floating oil and scum, the wastewater in the grit and grease trap 10 overflows into the wastewater collection tank 20. The wastewater collection tank 20 contains a second submersible pump 21, a first level switch, a first agitator 22, a first pH meter 23, and a first suspended solids meter 24.

[0054] The sludge reduction device 30 uses gravity settling to convert high-concentration sewage in the sewage collection tank 20 into low-concentration sewage (supernatant) and concentrated sludge.

[0055] Conditioning tank 40 is used to adjust the pH value of the low-concentration wastewater (supernatant) to obtain a neutralized water sample, which overflows into conditioning tank 50. Conditioning tank 40 contains a second pH sensor and a second stirrer.

[0056] The equalization tank 50 is used to balance the amount of water entering the magnetic coagulation wastewater purification device 60, preventing the amount of water entering the magnetic coagulation wastewater purification device 60 from exceeding the device's treatment capacity. The equalization tank 50 contains a third submersible pump, a second level switch, and a third agitator.

[0057] The magnetic coagulation wastewater purification device 60 is used to separate solids and liquids from wastewater from the equalization tank 50 to obtain neutral sludge and clean water.

[0058] The clear water tank 70 is used for multi-stage sedimentation purification of the clear water. It contains a third pH meter and a second suspended solids meter. In this embodiment, the clear water tank 70 has multiple independent sedimentation cells 71, which are sequentially overflowing and connected. In other embodiments, the clear water tank 70 is used for single-stage sedimentation purification of the clear water.

[0059] In the above scheme, the sewage collection tank 20, sludge reduction device 30, equalization tank 50, conditioning tank 40, magnetic coagulation sewage purification device 60, and clear water tank 70 are sequentially arranged downstream of the grit and grease trap 10. Sewage flows from the main sewage ditch into the grit and grease trap 10, where floating oil and scum form on the surface. After removing the floating oil and scum, the remaining sewage enters the sewage collection tank 20. The sludge deposited in the grit and grease trap 10 can be periodically discharged by the first submersible pump 11. When the water volume in the sewage collection tank 20 reaches the predetermined sewage volume, the first liquid level switch controls the second submersible pump 21 to pump the sewage into the sludge reduction device 30, causing solid-liquid separation based on gravity settling. The separated sludge settles at the bottom of the sludge reduction device 30, and the supernatant overflows into the conditioning tank 40. An appropriate amount of conditioning agent is added to the conditioning tank 40 to adjust the pH value to the set range (neutral or near neutral). After the pH value is adjusted, the sewage in the conditioning tank 40 overflows into the conditioning tank 50. The second liquid level switch in the conditioning tank 50 controls the third submersible sewage pump to pump the sewage into the magnetic coagulation sewage purification device 60. After solid-liquid separation in the magnetic coagulation sewage purification device 60, the resulting clear water is discharged into the clear water tank 70. After multi-stage sedimentation purification in the clear water tank 70, it is discharged.

[0060] As can be seen from the above, this embodiment can adapt to the characteristics of large instantaneous fluctuations in tunnel water inflow and has strong resistance to shock loads; it has a more stable treatment effect when suspended solids and pH fluctuate greatly; it can treat high-oil-contaminated wastewater; the clear water tank 70 performs multi-stage sedimentation and purification on the clear water, resulting in higher effluent water quality.

[0061] See Figure 1Furthermore, in this embodiment, from a spatial arrangement perspective, the grit separator 10, the sewage collection tank 20, the conditioning tank 40, and the equalization tank 50 are arranged in close succession. A storage space is left between the equalization tank 50 and the clear water tank 70. The sludge reduction device 30 and the magnetic coagulation sewage purification device 60 are installed in this storage space and connected to the relevant treatment devices through pipes, etc., to realize the automated sewage treatment process.

[0062] In the above scheme, this embodiment adopts a modular and intensive design concept, and the system occupies a small area.

[0063] Example 2

[0064] See Figures 1-2 This embodiment is a specific implementation method in which the equalization tank 50 is used to balance the amount of water entering the magnetic coagulation sewage purification device 60, so as to avoid the amount of water entering the magnetic coagulation sewage purification device 60 being excessive and exceeding the treatment capacity of the device.

[0065] This embodiment also includes an emergency discharge ditch 51, and the upper part of the regulating tank 50 has an overflow outlet. The emergency discharge ditch 51 is arranged in the storage compartment, with one end connected to the overflow outlet of the regulating tank 50 and the other end connected to the inlet of the clear water tank 70. In this way, when the sewage volume exceeds the treatment capacity of the magnetic coagulation sewage purification device 60, the excess sewage overflows from the regulating tank 50 into the clear water tank 70 (or, when sewage overflows from the regulating tank 50 into the clear water tank 70, it indicates that the sewage volume exceeds the treatment capacity of the magnetic coagulation sewage purification device 60).

[0066] Example 3

[0067] See Figures 1-2 This embodiment is an improvement on embodiment 1 or 2.

[0068] This embodiment also includes an air flotation unit 80, from which floating oil and scum scooped from the sedimentation tank 10 are processed. The supernatant of the sludge reduction device 30 contains a small amount of floating oil and scum on its surface; this floating oil and scum scooped from the sludge reduction device 30 are also processed in the air flotation unit 80. The waste oil and scum obtained after processing by the air flotation unit 80 are discharged into a slag bucket, while the clean water is discharged into the conditioning tank 40.

[0069] The installation of the air flotation unit 80 facilitates the treatment of floating oil and scum dredged from the sedimentation tank 10, as well as the treatment of small amounts of floating oil and scum from the sludge reduction device 30.

[0070] This embodiment also includes a solid-liquid separation device 90, which is used to separate the deposited sludge at the bottom of the sludge reduction device 30 into filtrate and sludge cake; the filtrate is transported into the sewage collection tank 20 through a corresponding pipeline, and the sludge cake is transported off-site for treatment.

[0071] This embodiment also includes a sewage emergency tank 100. The sewage collection tank 20 has an overflow outlet 25 connected to the sewage emergency tank 100. When the inflow is too large, the excess sewage in the sewage collection tank 20 enters the sewage emergency tank 100 for temporary storage to prevent the system from being affected by emergencies and causing sewage overflow. A fourth submersible sewage pump 101 is installed in the sewage emergency tank 100 to pump the sewage in the sewage emergency tank 100 back to the sewage collection tank 20 after the water volume in the sewage collection tank 20 decreases.

[0072] To facilitate the addition of conditioning agents to the conditioning tank 40 and PAM and PAC agents to the magnetic coagulation wastewater purification device 60, this embodiment also includes: a pH dosing device 110, a PAC dosing device 120, and a PAM dosing device 130.

[0073] The pH dosing device 110 dissolves the powdered agent in advance and adds the agent solution to the conditioning tank 40 to adjust the pH value. The pH dosing device 110 automatically adjusts the amount of agent added based on the feedback from the second pH sensor in the conditioning tank 40, and controls the pH within the range of 6 to 9.

[0074] The PAC dosing device 120 pre-dissolves the PAC powder (coagulant) and adds it to the sludge reduction device 30 and the magnetic coagulation wastewater purification device 60.

[0075] PAM dosing device 130 pre-dissolves PAM powder (flocculator) and adds it to sludge reduction device 30 and magnetic coagulation wastewater purification device 60.

[0076] Furthermore, in order to improve the quality of the effluent, the aforementioned PAC dosing device 120 and PAM dosing device 130 are also used to add PAC and PAM agents to the sludge reduction device 30, respectively.

[0077] It is understandable that the descriptions of the flow direction and treatment sequence of sewage mentioned above require the use of corresponding pipes, valves and other equipment, which are all commonly used fluid transport equipment.

[0078] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A floating oil and scum tunnel construction wastewater treatment system, characterized by, Including those connected sequentially: Sedimentation and grease trap; Wastewater collection tank, in which the wastewater in the grit and grease trap is removed of floating oil and scum before entering the wastewater collection tank; The sludge reduction device transforms high-concentration wastewater in the wastewater collection tank into low-concentration wastewater and concentrated sludge based on gravity sedimentation. A conditioning tank is used to adjust the pH value of the low-concentration wastewater to obtain a neutralized water sample, which then enters the conditioning tank. The equalization tank is used to balance the amount of water entering the magnetic coagulation wastewater purification device; A magnetic coagulation wastewater purification device is used to perform solid-liquid separation on wastewater from the equalization tank to obtain neutral sludge and clean water. A clear water tank is used to precipitate and purify the clear water.

2. The floating scum tunnel construction wastewater treatment system according to claim 1, characterized in that, The sedimentation tank, the wastewater collection tank, the conditioning tank, and the equalization tank are arranged in a row next to each other. There is a space between the equalization tank and the clear water tank. The sludge reduction device and the magnetic coagulation wastewater purification device are installed in the space.

3. The floating scum tunnel construction wastewater treatment system according to claim 2, wherein, It also includes an emergency discharge ditch, and the upper part of the regulating pool has an overflow outlet for the regulating pool; the emergency discharge ditch is arranged in the storage compartment, one end of the emergency discharge ditch is connected to the overflow outlet of the regulating pool, and the other end is connected to the inlet of the clear water pool.

4. The oil sheen containment tunneling wastewater treatment system of claim 1, wherein, The clear water tank has multiple independent sedimentation cells, and each sedimentation cell is connected to the other via overflow.

5. The oil sheen containment tunneling wastewater treatment system of claim 1, wherein, It also includes a wastewater emergency pool, the wastewater collection pool having an overflow outlet connected to the wastewater emergency pool.

6. The oil sheen containment tunneling wastewater treatment system of claim 1, wherein, It also includes a solid-liquid separation device for separating the deposited sludge at the bottom of the sludge reduction device into filtrate and sludge cake; the filtrate enters the wastewater collection tank.

7. The oil sheen containment tunneling wastewater treatment system of claim 1, wherein, Also includes: A second pH sensor is installed inside the conditioning tank; A pH dosing device is used to add conditioning agents to the conditioning tank and is associated with the second pH sensor.

8. The oil sheen containment tunneling wastewater treatment system of claim 1, wherein, It also includes PAC dosing devices and PAM dosing devices.

9. The tunnel construction wastewater treatment system with oil slick scum according to any one of claims 1 to 8, characterized in that, It also includes an air flotation machine, in which floating oil and scum scooped from the sedimentation tank are processed, and the resulting clean water is discharged into the conditioning tank.

10. The oil sheen containment tunneling wastewater treatment system of claim 9, wherein, The floating oil and scum dredged from the sludge reduction device are processed in the air flotation machine, and the resulting clean water is discharged into the conditioning tank.

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