Tunnel construction sewage treatment device and system

Abstract

The utility model provides a tunnel construction sewage treatment device and system, the device comprises a coagulant aid putting tank, a flocculating agent adding tank, a vertical flow type sedimentation tank and a filter press which are connected in sequence, the coagulant aid putting tank and the flocculating agent adding tank are configured to put a coagulant aid and a flocculating agent into sewage to flocculate the sewage; the vertical flow type sedimentation tank comprises a cylinder and a cone which are sequentially arranged from top to bottom, a water inlet channel is formed in the upper end of the cylinder in the radial direction, a water flowing groove is formed in the upper end of the cylinder in the circumferential direction, the water flowing groove is communicated with the water inlet channel, and the terminal end of the water inlet channel is located in the center of the cylinder. The central vertical flow pipe is located in the cylinder, and the bottom end of the cone is connected with the filter press. The system comprises a drainage pipe, a water collecting pit, a slag pool and the device. The sewage treatment device has the beneficial effects that the field is saved, and the sewage treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular to a tunnel construction sewage treatment device and system. Background Art

[0002] At present, sewage treatment in tunnel construction mostly adopts the method of setting up sedimentation tanks, which separate solids and liquids through filtration and sedimentation to achieve sewage purification and discharge. This device requires the setting up of multiple sedimentation tanks (at least four levels), which requires a large amount of land (about 500m 2 ), which is sometimes difficult to achieve for tunnels built in mountains due to the limitations of terrain conditions. In addition, due to the influence of construction season and geological environment, when the sewage discharge increases, the traditional sedimentation treatment method has limited sewage treatment capacity, and the organic matter and harmful substances in the sewage cannot be completely removed and filtered, which will cause serious harm to the environment and people's health after discharge. Secondly, the sedimentation tank treatment needs to be set up at any time to clean and transport the sediment with an excavator and a dump truck, which consumes a lot of manpower and material resources. The sediment is in the shape of mud and has a high water content. It cannot be comprehensively utilized and needs to be stored in a special place. If it is directly stored in the waste dump, it will fly with the wind after drying, causing environmental pollution; if it encounters rain, it will overflow and cause secondary pollution. In addition, some tunnel engineering wastewater is only treated with a filter press, and the machine operation workload is extremely large, it is easy to be damaged, and the maintenance cost is high. Therefore, it is of great significance to provide a tunnel construction sewage treatment device and system. Utility Model Content

[0003] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the present invention is to provide a tunnel construction sewage treatment device that can speed up sewage treatment. For another example, another purpose of the present invention is to provide a tunnel construction sewage treatment system that can improve sewage treatment efficiency.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a tunnel construction sewage treatment device on the one hand, which may include a coagulant delivery tank, a flocculant addition tank, a vertical flow sedimentation tank and a filter press connected in sequence, wherein the coagulant delivery tank and the flocculant addition tank are configured to deliver coagulants and flocculants into the sewage to flocculate the sewage; the vertical flow sedimentation tank includes a cylinder and a cone arranged in sequence from top to bottom, an inlet channel is radially arranged at the upper end of the cylinder, a flow trough is circumferentially arranged at the upper end of the cylinder, the flow trough is connected to the inlet channel, and the terminal of the inlet channel is located in the center of the cylinder, a central vertical flow pipe is arranged in the direction of the central axis of the vertical flow sedimentation tank, the central vertical flow pipe is located in the cylinder, and the bottom end of the cone is connected to the filter press.

[0005] According to an exemplary embodiment of one aspect of the present invention, the vertical flow sedimentation tank may further include a baffle, and the baffle is arranged in the water flow channel.

[0006] According to an exemplary embodiment of one aspect of the utility model, the vertical flow sedimentation tank may further include a reflection plate, and the reflection plate is arranged at the lower end of the central vertical flow pipe.

[0007] According to an exemplary embodiment of one aspect of the present invention, a spiral water flow trough may be provided in the central vertical flow pipe.

[0008] According to an exemplary embodiment of one aspect of the utility model, the coagulant delivery tank and the flocculant addition tank may be arranged at an interval of 5 to 15 m; and automatic flow controllers may be provided at the outlets of the coagulant delivery tank and the flocculant addition tank.

[0009] According to an exemplary embodiment of one aspect of the present invention, the diameter of the cylinder may be 6 to 8 meters.

[0010] According to an exemplary embodiment of one aspect of the utility model, a sewage pump may be provided between the vertical flow sedimentation tank and the filter press.

[0011] According to an exemplary embodiment of one aspect of the utility model, the coagulant aid delivery tank, flocculant addition tank, vertical flow sedimentation tank and filter press can be connected through a sewage pipe; the sewage pipe may include a 125*6.0 type PE water pipe.

[0012] According to an exemplary embodiment of one aspect of the utility model, the longitudinal slope of the sewage pipe between the coagulant aid delivery tank, the flocculant addition tank and the vertical flow sedimentation tank may be 3%.

[0013] Another aspect of the utility model provides a tunnel construction sewage treatment system, which may include a drainage pipe, a sump, a slag pool and the tunnel construction sewage treatment device as described above, wherein the drainage pipe is distributed longitudinally and transversely in the formed section of the tunnel to discharge unpolluted water into the central ditch or the side ditch; the sump is set at the far end of the tunnel construction face and the invert arch to collect polluted water; a sewage pipe is set from the sump to connect to the coagulant delivery tank outside the tunnel, and the sewage pipe is set along the tunnel arch foot; the tunnel construction sewage treatment device is located outside the tunnel; the slag pool is set outside the tunnel, and the slag cake of the filter press is unloaded into the slag pool.

[0014] Compared with the prior art, the beneficial effects of the utility model include at least one of the following:

[0015] (1) The tunnel construction sewage treatment device proposed by the utility model can achieve wastewater discharge standards and eliminate or reduce the occurrence of environmental incidents.

[0016] (2) The tunnel construction sewage treatment system proposed by the utility model can fully utilize the tunnel construction site and reduce the occupation of farmland or land.

[0017] (3) The tunnel construction sewage treatment device proposed by the utility model can speed up the sewage treatment process and improve the treatment efficiency.

[0018] (4) The tunnel construction sewage treatment system proposed by the utility model can turn waste into treasure and reasonably utilize solid sediment and wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic structural diagram of a tunnel construction sewage treatment device according to an exemplary embodiment of the present utility model is shown;

[0021] Figure 2 A schematic cross-sectional structure diagram of a vertical flow sedimentation tank is shown;

[0022] Figure 3 A schematic diagram of the top view of a vertical flow sedimentation tank is shown;

[0023] Figure 4 A schematic diagram of the structure of a coagulant aid delivery tank or a flocculant addition tank is shown;

[0024] Figure 5 A schematic diagram of a sewage treatment process of a tunnel construction sewage treatment system according to another exemplary embodiment of the present utility model is shown.

[0025] Description of main reference numerals:

[0026] 1-coagulant delivery tank, 2-flocculant addition tank, 3-vertical flow sedimentation tank, 31-cylinder, 32-cone, 33-inlet channel, 34-outlet pipe, 35-flow trough, 36-central vertical flow pipe, 37-reflection plate, 4-filter press, 5-sewage pump. DETAILED DESCRIPTION

[0027] Hereinafter, a tunnel construction sewage treatment device and system of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" and "several" mean two or more.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] Exemplary Embodiment 1

[0031] This exemplary embodiment provides a tunnel construction sewage treatment device.

[0032] like Figures 1 to 3 As shown in the figure, the tunnel construction sewage treatment device mainly includes a coagulant delivery tank 1, a flocculant addition tank 1, a vertical flow sedimentation tank 3 and a filter press 4. The tunnel construction sewage treatment device can perform primary chemical flocculation, secondary rotary separation sedimentation, and tertiary filtration compression dehydration on the polluted water body to achieve rapid and standard sewage treatment, reduce resource input, and save costs.

[0033] In the tunnel construction sewage treatment device, the coagulant delivery tank 1, the flocculant addition tank 2, the vertical flow sedimentation tank 3 and the filter press 4 can be connected through a sewage pipe. The coagulant delivery tank and the flocculant addition tank are reagent storage tanks, which are configured to deliver coagulants and flocculants into the sewage to flocculate the sewage. The coagulant may include a polyaluminum chloride solution, and the flocculant may include a polyacrylamide solution. An automatic flow controller is provided at the outlet of the coagulant delivery tank and the flocculant addition tank, which can automatically adjust the flow rate of the reagent solution added to the sewage according to the flow rate of sewage discharge. Under the action of the coagulant and flocculant, the sewage is fully mixed during the transmission process through the sewage pipe, and a chemical reaction occurs, preparing for the next step of precipitation and solid-liquid separation. The coagulant delivery tank and the flocculant addition tank realize the primary chemical flocculation of the sewage.

[0034] Sewage can be treated by solid-liquid separation in the vertical flow sedimentation tank 3. The vertical flow sedimentation tank includes a cylinder 31 and a cone 32 arranged in sequence from top to bottom. An inlet channel 33 is arranged radially at the upper end of the cylinder 31. The terminal of the inlet channel 33 is located at the center of the cylinder 31. A water flow trough 35 is arranged circumferentially at the upper end of the cylinder 31. The water flow trough 35 is connected with the inlet channel 33. Sewage flows through the water flow trough 35 and then flows through the inlet channel 33 to the middle of the cylinder 31 and enters the central vertical flow pipe 36. A central vertical flow pipe 36 is arranged in the central axis direction of the vertical flow sedimentation tank 3. A spiral water flow trough can be arranged in the central vertical flow pipe 36; the central vertical flow pipe 36 is located in the cylinder 31. An outlet pipe 34 (overflow pipe) is arranged outside the cylinder 31. The upper layer of clear water in the vertical flow sedimentation tank 3 flows into the outlet pipe 34 from the inlet pipe of the outlet pipe 34 and can be discharged after passing the test. The vertical flow sedimentation tank can realize the secondary rotary separation and sedimentation of sewage.

[0035] In this exemplary embodiment, Figure 2 As shown in , the vertical flow sedimentation tank may also include a reflector 37, which is arranged at the lower end of the central vertical flow pipe 36 and is mainly used to buffer and block sewage so that the sewage can be distributed to the surroundings.

[0036] In this exemplary embodiment, the water inlet of the water outlet pipe may be arranged 40 to 60 cm away from the top of the vertical flow sedimentation tank.

[0037] In this exemplary embodiment, the vertical flow sedimentation tank may further include a baffle, which is disposed in the water flow channel and mainly serves as a sewage buffer.

[0038] In this exemplary embodiment, the tank body of the vertical flow sedimentation tank can be assembled by welding 3mm thick steel plates, and its upper part can be a cylinder with a diameter of 6 to 8m. The utility model is not limited to this, and the diameter of the cylinder can be designed according to the needs of the site.

[0039] In this exemplary embodiment, the coagulant aid tank and the flocculant addition tank are arranged 5 to 15 meters apart, for example, 10 meters apart. Avoiding adding the two agents at the same time can improve the flocculation effect and reduce costs. Figure 4 As shown in , a stirring assembly may be provided in the coagulant aid delivery tank / flocculant addition tank. The stirring assembly includes a power unit and a stirring unit. The stirring unit is in the shape of a long strip and extends into the tank body to stir the liquid medicine.

[0040] In this exemplary embodiment, the coagulant aid and flocculant can be prepared at a concentration of 5% and stored in tanks respectively. During the initial flocculation treatment, the two agents can be added in a ratio of 1:1.

[0041] In this exemplary embodiment, Figure 1As shown in the figure, a sewage pump 5 can be arranged between the vertical flow sedimentation tank 3 and the filter press 4. The bottom of the cone can be connected to the sewage pump, and the sewage is treated by the vertical flow sedimentation tank. The flocculent sediment formed at the bottom of the cone can be lifted to the filter press by the sewage pump and then processed in the third process (three-stage filtration compression dehydration). After the sewage is treated by the filter press, it is filtered, dehydrated, pressed into cakes, and discharged after the clean water meets the standards.

[0042] In this exemplary embodiment, the longitudinal slope of the sewage pipe between the coagulant aid delivery tank, the flocculant addition tank and the vertical flow sedimentation tank may be 3%. The sewage pipe may include a 125*6.0 type PE water pipe.

[0043] Exemplary Embodiment 2

[0044] The present exemplary embodiment provides a tunnel construction sewage treatment system.

[0045] The tunnel construction sewage treatment system may include the tunnel construction sewage treatment device described in the above exemplary embodiment 1, and the tunnel construction sewage treatment system may further include a drainage pipe, a sump and a slag pool.

[0046] Among them, the drainage pipes are distributed vertically and horizontally in the formed sections of the tunnel, and the uncontaminated water is discharged into the central ditch or side ditch. The sump is set at the far end of the tunnel construction face and the invert arch to collect polluted water (for example, tunnel leakage water in the excavated section and unformed section, water used for construction operations, etc.). A sewage pipe is set from the sump to the outside of the tunnel, and the sewage pipe is set along the arch foot of the tunnel. The tunnel construction sewage treatment device is located outside the tunnel. The coagulant delivery tank and flocculant addition tank of the tunnel construction sewage treatment device are located near the tunnel entrance, and the slag pool is set next to the filter press outside the tunnel, and the slag cake of the filter press is unloaded into the slag pool.

[0047] like Figure 5 As shown in , the sewage treatment process of the tunnel construction sewage treatment system of this exemplary embodiment may include: separating clean and dirty water; clean water flows into channels such as the central ditch; sewage flows into a sump and flows out of the tunnel through a pipe; adding polyaluminum chloride solution to the sewage; then adding polyacrylamide solution; the reagent and sewage are mixed in the pipeline; then the sewage enters a vertical flow sedimentation tank; the sewage is treated in a vertical flow sedimentation tank, and the upper clean water is separated and enters the clean water pipeline (overflow pipe). If the sewage is tested to be up to standard for discharge, the slag can be comprehensively utilized for dehydration and cake making; the sewage is treated in a vertical flow sedimentation tank, and flocs and sediments sink to the bottom of the cone (the bottom of the cone), and then the sewage will be pumped to the filter press for treatment; after being treated by the filter press, if the clean water obtained is tested to be up to standard for discharge, the slag can be comprehensively utilized for dehydration and cake making; after the sewage is treated by the filter press, the sediment is dehydrated and cake making, and finally the slag can be comprehensively utilized for dehydration and cake making.

[0048] Specifically, the tunnel construction sewage treatment system of this exemplary embodiment is based on the separation of clean and dirty water, and can achieve rapid and standard sewage treatment for polluted water through measures such as primary chemical flocculation, secondary rotary separation sedimentation, and tertiary filtration compression dehydration, thereby reducing resource input and saving costs. For example, its construction and workflow may include:

[0049] S1. Separate clean and dirty water before sewage treatment. Tunnel sewage generally consists of two parts: the seepage water from the cracks in the tunnel rock surface, which can be directly discharged before pollution. In the tunnel section where the tunnel has been formed, it can be discharged into the central ditch or side ditch through longitudinal and transverse drainage pipes, blind pipes and other measures, and it is forbidden to mix with sewage to reduce the amount of sewage discharged.

[0050] S2. Set up a collection pit at the far end of the tunnel construction face and the invert arch to collect tunnel leakage water and construction water (wet operation spray water, construction machinery water, concrete maintenance water, road surface washing and cleaning water, etc.) from the excavated section and unformed section.

[0051] S3. A dedicated sewage pipe is set up along the tunnel arch foot, connecting it from the sump to the outside of the tunnel. Generally, a 125*6.0 PE water pipe is used. If the drainage is reverse slope, a sewage pump is required.

[0052] S4. Set up a point for adding coagulant chemicals at the tunnel entrance. First, set up a polyaluminium chloride solution (coagulant) delivery device along the sewage flow direction.

[0053] S5. Polyacrylamide solution (flocculant) adding device can be set up at intervals of 10 meters. Avoid adding two agents at the same time to improve the flocculation effect and reduce costs. Both agents are prepared at a concentration of 5% and stored in storage tanks respectively. The ratio of the two agents is 1:1 during the initial flocculation treatment. Both agent storage tanks are equipped with automatic flow controllers, which can automatically adjust the solution flow according to the flow rate of sewage discharge.

[0054] S6. Under the action of coagulants and flocculants, sewage is fully mixed and chemically reacted during transmission through sewage pipes, preparing for the next step of sedimentation and solid-liquid separation (the pipeline should use 125*6.0 PE water pipes with a longitudinal slope of 3%).

[0055] S7. The sewage with flocculant added flows into the vertical flow sedimentation tank through the sewage pipe for solid-liquid diversion treatment. The tank body can be welded and assembled by 3mm thick steel plates, with the upper part being a cylinder with a radius of 4m and the lower part being a cone. The inner wall of the cylinder is welded and assembled to form a spiral water flow trough to the vertical flow pipe in the middle of the tank body. An overflow water pipe is set 50cm from the top of the tank body, and the bottom of the cone is connected to a sewage pump.

[0056] S8. Sewage is quickly separated under the action of gravity in a vertical flow sedimentation tank. Flocs mixed with sediment and tiny particles sink to the bottom of the cone. Clean water rises to the mouth of the overflow pipe with the liquid level and flows into the overflow pipe. The water is directly discharged after being tested and meeting the standards.

[0057] S9: The flocculent sediment at the bottom of the cone is lifted to the filter press by the sewage pump and then processed in the third process.

[0058] S10, filtration, dehydration, cake pressing, discharge after the clean water meets the standard, and unload the slag cake into the slag pool. After the secondary diversion treatment in the vertical flow sedimentation treatment tank, most of the sewage has been discharged, greatly reducing the workload of the filter press.

[0059] In summary, the beneficial effects include:

[0060] The utility model provides a tunnel construction sewage treatment device and system, which is mainly used for sewage treatment. After the comprehensive treatment of the three processes of the device or system of the utility model, the sewage can reach the second-class surface water quality standard after being tested by a qualified testing unit, and can be directly discharged to avoid environmental pollution incidents; it avoids the shortcomings and deficiencies of the previous single treatment method, greatly improves the sewage treatment capacity, and can reach 100m 3 / h, can treat all the sewage from tunnel construction to meet the standards; no large, multi-stage sedimentation tanks are required, reducing the construction land. The land area is about 50m 2 It only takes about 1 / 10 of the land used by traditional sedimentation tanks. The entire process is handled in a closed pipeline, avoiding the safety hazards caused by people and animals accidentally entering the construction site. The sewage treatment is fully automated and does not require special supervision, saving manpower and material resources and reducing costs. The treated water can meet the second-class surface water quality standards and can be used for engineering concrete mixing and maintenance, road sprinkling and dust reduction, etc., greatly improving the utilization rate of water resources. After dehydration and drying, the sediment can be used as embankment filling and construction access road maintenance and repair, turning waste into treasure.

[0061] Although a tunnel construction sewage treatment device and system of the utility model has been described above in combination with exemplary embodiments, those skilled in the art should be aware that various modifications and changes may be made to the exemplary embodiments of the utility model without departing from the spirit and scope defined by the claims.

Claims

1. A tunnel construction sewage treatment device, characterized in that: The device comprises a coagulant delivery tank, a flocculant addition tank, a vertical flow sedimentation tank and a filter press connected in sequence, wherein: The coagulant adding tank and the flocculant adding tank are configured to add coagulant and flocculant into the sewage to perform flocculation treatment on the sewage; The vertical flow sedimentation tank includes a cylinder and a cone arranged in sequence from top to bottom. A water inlet channel is arranged radially on the upper end of the cylinder, and a water flow trough is arranged circumferentially on the upper end of the cylinder. The water flow trough is connected with the water inlet channel, and the terminal of the water inlet channel is located in the center of the cylinder. A central vertical flow pipe is arranged in the central axis direction of the vertical flow sedimentation tank, and the central vertical flow pipe is located in the cylinder. The bottom end of the cone is connected to the filter press.

2. The tunnel construction wastewater treatment device according to claim 1, characterized in that: The vertical flow sedimentation tank also includes a baffle, which is arranged in the water flow channel.

3. The tunnel construction wastewater treatment device according to claim 1, characterized in that: The vertical flow sedimentation tank further comprises a reflection plate, and the reflection plate is arranged at the lower end of the central vertical flow pipe.

4. The tunnel construction wastewater treatment device according to claim 1, characterized in that: A spiral water flow trough is arranged in the central vertical flow pipe.

5. The tunnel construction wastewater treatment device according to claim 1, characterized in that: The coagulant aid delivery tank and the flocculant addition tank are arranged at an interval of 5 to 15 m; automatic flow controllers are arranged at the outlets of the coagulant aid delivery tank and the flocculant addition tank.

6. The tunnel construction wastewater treatment device according to claim 1, characterized in that: The diameter of the cylinder is 6 to 8 meters.

7. The tunnel construction wastewater treatment device according to claim 1, characterized in that: A sewage pump is arranged between the vertical flow sedimentation tank and the filter press.

8. The tunnel construction wastewater treatment device according to claim 1, characterized in that: The coagulant aid delivery tank, flocculant addition tank, vertical flow sedimentation tank and filter press are connected through a sewage pipe; the sewage pipe includes a 125*6.0 type PE water pipe.

9. The tunnel construction wastewater treatment device according to claim 8, characterized in that: The longitudinal slope of the sewage pipeline between the coagulant aid delivery tank, the flocculant addition tank and the vertical flow sedimentation tank is 3%.

10. A tunnel construction sewage treatment system, characterized in that: The system comprises a drainage pipe, a sump, a slag pool and a tunnel construction sewage treatment device according to any one of claims 1 to 9, wherein: Drain pipes are distributed vertically and horizontally in the formed sections of the tunnel, draining unpolluted water into the central ditch or side ditch; The water collection pit is set up at the far end of the tunnel construction face and the invert to collect polluted water; A sewage pipe is set from the sump to connect to the coagulant delivery tank outside the tunnel, and the sewage pipe is set along the tunnel arch foot; the tunnel construction sewage treatment device is located outside the tunnel; the slag pool is set outside the tunnel, and the slag cake of the filter press is unloaded into the slag pool.

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