Device and method for treating high-alkalinity oil-containing tunnel construction wastewater

Abstract

The invention discloses a treatment device and method for high-alkalinity oil-containing tunnel construction wastewater, the device is provided with a plurality of sewage treatment areas, and an oil removal area, a coagulation area, a flocculation area and a settling area are connected through pipelines or partition plates to realize partitioned and segmented treatment of sewage. A pH adjusting system, a coagulant preparing and adding system and a flocculant preparing and adding system are integrated in the equipment area. According to the device, skid-mounted container equipment is adopted, the functions of pH adjustment, floating oil collection, coagulant preparation and addition, flocculant preparation and addition and the like are integrated, the whole device is small in occupied area and can be used after being mounted, the device can be transported to other similar projects to be continuously used after the project is finished, and one-time assembly and repeated use are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment devices, in particular to a device and method for treating highly alkaline oil-containing tunnel construction wastewater. Background Art

[0002] Highway projects, especially those in mountainous areas, are often accompanied by a large number of tunnel constructions. The prominent environmental problem of tunnel construction is the generation of a large amount of tunnel construction wastewater. According to statistics, this has become another major geological hazard after the collapse of tunnel construction, which will bring very serious consequences to the implementation of the entire tunnel project. Most of the tunnel construction processes use wet rock drilling. During the drilling process, high-pressure water will be used to moisten the dust so that it will flow out as magma. At the same time, spray water will be used during the blasting process to prevent the dust generated by the blasting operation from affecting the environment. The above construction process will produce mud wastewater, which is mostly alkaline, with high concentrations of SS and petroleum. If these construction wastewaters are not collected and treated and are allowed to be discharged, they will cause varying degrees of pollution to the water environment near the import and export.

[0003] At present, tunnel construction wastewater is generally treated by building structures near the project site. When the project is completed, such structures are often abandoned, resulting in a waste of land resources. At the same time, the traditional treatment processes often have problems such as poor adaptability and poor timeliness. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the structure for treating alkaline oily wastewater will be abandoned when the project is completed, resulting in a waste of resources, while the traditional wastewater treatment system cannot meet the treatment requirements of such wastewater.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a disposal device for highly alkaline oil-containing tunnel construction wastewater, including a skid-mounted base and an oil removal area, an oil storage area, a coagulation area, a flocculation area and a sedimentation area arranged on the base along the wastewater treatment direction, the sedimentation area and the flocculation area as well as the flocculation area and the coagulation area are connected through a perforated partition, the coagulation area is connected to the oil removal area through a vertical centrifugal pump, the oil storage area is connected to the oil removal area through a float-type oil skimmer, an equipment area is arranged at the end of the base, and a pH adjustment system, a coagulant configuration and dosing system and a flocculant configuration and dosing system are arranged in the equipment area.

[0006] Preferably, a perforated aeration pipe is installed in the oil removal area, one end of the perforated aeration pipe is connected to the high-pressure vortex blower in the equipment area through a valve, and the other end is connected to an annular aeration pipe, and openings are evenly arranged on the annular aeration pipe.

[0007] Preferably, the output end of the float type oil skimmer is connected to the oil storage area through a hose, the outer wall of the input end is connected to a float, the floats are distributed at equal angles along the axis of the input end, and the side wall of the input end is provided with an oil inlet.

[0008] Preferably, the input end of the vertical centrifugal pump is connected to the inner bottom of the oil removal zone, and the output end is connected to the inner top of the coagulation zone. A pipeline mixer is installed on the output end of the vertical centrifugal pump, and the pH adjustment system is connected to the pipeline mixer.

[0009] Preferably, the pH adjustment system comprises an acid storage barrel and an acid dosing pump, the input end of the acid dosing pump is connected to the acid storage barrel, the output end of the acid dosing pump is connected to the pipeline mixer through a hose, and a water quality detector is installed in the sedimentation area.

[0010] Preferably, a coagulation mixer is installed in the coagulation zone, and the coagulant configuration and dosing system includes a coagulant dosing pump, a coagulant mixer, a coagulant storage barrel, an inlet pipe, a vent pipe and an overflow pipe, the inlet pipe, the vent pipe and the overflow pipe are all connected to the coagulant storage barrel, the coagulant mixer is installed at the top of the coagulant storage barrel, and the coagulant dosing pump connects the coagulant storage barrel and the coagulation zone.

[0011] Preferably, the flocculant configuration and dosing system includes a flocculant storage barrel, a flocculant mixer, a water inlet pipe, a flocculant dosing pump, a vent pipe and an overflow pipe, the water inlet pipe, the vent pipe and the overflow pipe are all connected to the flocculant storage barrel, the flocculant mixer is installed on the top of the flocculant storage barrel, and the flocculant dosing pump connects the flocculant storage barrel and the flocculation area.

[0012] Preferably, a scraper is installed in the sedimentation area, and a sludge collecting area is provided at the bottom of the sedimentation area. The sludge collecting area is located below the scraper, and the scraper is an underwater type.

[0013] Preferably, perforated pipes are evenly arranged in the sludge collection area, the perforated pipes are connected to the sludge centrifugal pump in the equipment area through pipelines, and the output end of the sludge centrifugal pump is connected to the outside of the equipment through a flange and a pipeline.

[0014] A method for treating highly alkaline oil-containing tunnel construction wastewater comprises the following steps: Step 1: introduce sewage into the oil removal area, supply air to the perforated aeration pipe through a high-pressure vortex fan, aerate the sewage in the oil removal area, and then use a float skimmer to collect floating oil on the surface of the sewage. The float skimmer transports the collected floating oil to the oil storage area through a pipeline, and discharges the floating oil through the pipeline regularly; Step 2: After the floating oil is removed, start the vertical centrifugal pump and the acid dosing pump. At this time, the sewage is fully mixed with the acid through the pipeline mixer, and the opening degree of the acid dosing pump is adjusted according to the result of the water quality detector at the outlet of the sedimentation area; Step 3: The sewage mixed with the acid enters the coagulation zone through the perforated partition, the coagulation mixer is started, and the coagulant is transported to the coagulation zone through the coagulant dosing pump, so that the sewage and the coagulant are mixed and enter the flocculation zone; Step 4: After the sewage enters the flocculation area, the flocculant dosing pump is started to transport the flocculant to the flocculation area, and the flocculation mixer is started to stir the sewage and the flocculant, and the sewage enters the sedimentation area; Step 5. The sewage flows into the sedimentation area through the openings on the partition. After the sewage passes through the mud-water separation pad, the upper clear liquid is discharged through the outlet of the sedimentation area. The sludge is collected in the sludge collection area through the scraper. The sludge centrifugal pump is opened regularly to discharge the settled sludge.

[0015] 1. The present invention provides a device and method for treating highly alkaline oil-containing tunnel construction wastewater. By setting up an oil removal area, a coagulation area, a flocculation area, a sedimentation area and an equipment area, the oil removal area performs oil removal treatment on the sewage, the coagulation area, the flocculation area and the sedimentation area perform pH adjustment and coagulation and sedimentation treatment on the sewage, and the equipment area is provided with a pH adjustment system, a coagulant configuration and dosing system and a flocculant configuration and dosing system to achieve accurate dosing of sewage. The sedimentation area scraper adopts an underwater type, which reduces the height of the equipment and the difficulty of installation. The perforated aeration pipe is set in the oil removal area to not only avoid the deposition of suspended matter, but also pre-oxidize the organic matter in the sewage to achieve the removal of a part of it. The entire sewage treatment process is coherent, efficient and highly automatic.

[0016] 2. A skid-mounted base is used for the installation of the oil removal area, coagulation area, flocculation area, sedimentation area and equipment area. Each treatment unit is highly integrated, which achieves the purpose of small footprint and ready-to-use. After the completion of this project, it can also be transported to similar projects for continued use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 It is a right side view of an embodiment of the present invention.

[0019] In the figure: 1. Sedimentation area; 2. Flocculation area; 3. Coagulation area; 4. Equipment area; 5. Oil removal area; 6. Flocculation mixer; 7. Coagulation mixer; 8. Flocculant dosing pump; 9. Flocculant mixer; 10. Coagulant mixer; 11. Coagulant dosing pump; 12. Acid dosing pump; 13. Oil storage area; 14. Float skimmer; 15. Vertical centrifugal pump; 16. Pipeline mixer; 17. Flocculant storage barrel; 18. Coagulant storage barrel; 19. Acid storage barrel; 20. Perforated aeration pipe; 21. High-pressure vortex fan; 22. Sludge centrifugal pump; 23. Sludge scraper. DETAILED DESCRIPTION

[0020] like Figure 1 and Figure 2 As shown, the present invention provides a treatment device for highly alkaline oil-containing tunnel construction wastewater, including a skid-mounted base and an oil removal area 5, an oil storage area 13, a coagulation area 3, a flocculation area 2 and a sedimentation area 1 arranged on the base along the wastewater treatment direction, the sedimentation area 1 and the flocculation area 2 as well as the flocculation area 2 and the coagulation area 3 are connected through a perforated partition plate, the coagulation area 3 is connected to the oil removal area 5 through a vertical centrifugal pump 15, the oil storage area 13 is connected to the oil removal area 5 through a float-type oil skimmer 14, and an equipment area 4 is arranged at the end of the base, and a pH adjustment system, a coagulant configuration and addition system and a flocculant configuration and addition system are arranged in the equipment area 4.

[0021] The entire treatment device is skid-mounted and integrated, which is convenient for transportation and has strong integrity. The entire sewage treatment process is coherent, efficient and highly automatic. In the oil removal area 5, coagulation area 3, flocculation area 2, sedimentation area 1 and equipment area 4, the oil removal area 5 removes oil from the sewage, the coagulation area 3, flocculation area 2 and sedimentation area 1 adjust the pH of the sewage and perform coagulation and sedimentation treatment. The pH adjustment system, coagulant configuration and dosing system and flocculant configuration and dosing system are set in the equipment area 4 to achieve accurate dosing of sewage.

[0022] like Figure 1 As shown. A perforated aeration pipe 20 is installed in the deoiling area 5. One end of the perforated aeration pipe 20 is connected to the high-pressure vortex blower 21 in the equipment area 4 through a valve, and the other end is connected to an annular aeration pipe, and openings are evenly arranged on the annular aeration pipe. Three annular aeration pipes are installed in the deoiling area 5, and an aeration pipe for reinforcement is also arranged inside the annular aeration pipe. The three annular aeration pipes are connected in series to the perforated aeration pipe 20. The perforated aeration pipe 20 replenishes air to the three annular aeration pipes at the same time. The openings arranged on the annular aeration pipe release air to aerate the sewage in the deoiling area 5, so that the oil in the sewage quickly floats on the water surface, and then the floating oil is collected by the float-type oil skimmer 14 floating on the water surface.

[0023] As a preferred embodiment of the present invention. The output end of the float type oil skimmer 14 is connected to the oil storage area 13 through a hose, the outer wall of the input end is connected with a float, the floats are distributed at equal angles along the axis of the input end, and the side wall of the input end is provided with an oil inlet. The bottom of the side wall of the float type oil skimmer 14 is opened for the oil film on the water surface to flow into the float type oil skimmer 14, and the float connected to the input end is used to ensure that the opening can always be located at the water surface, and the water inflow of the oil layer on the water surface is maintained as the sewage water level changes.

[0024] like Figure 1 and Figure 2As shown. The input end of the vertical centrifugal pump 15 is connected to the inner bottom of the degreasing zone 5, and the output end is connected to the inner top of the coagulation zone 3. A pipeline mixer 16 is installed on the output end of the vertical centrifugal pump 15, and the pH adjustment system is connected to the pipeline mixer 16. The acid and sewage are directly mixed in the pipeline mixer 16, and baffles are staggered on the relative inner walls of the pipeline mixer 16 to ensure the uniformity of the mixing of the acid and sewage. The amount of acid added is adjusted according to the pH value of the discharged water measured by the water quality detector installed at the outlet of the sedimentation zone 1 to ensure that the discharged water is in a neutral state.

[0025] like Figure 1 As shown. The pH adjustment system comprises an acid storage barrel 19 and an acid dosing pump 12, the input end of the acid dosing pump 12 is connected to the acid storage barrel 19, and the output end of the acid dosing pump 12 is connected to the pipeline mixer 16 through a hose, and a water quality detector is installed in the precipitation area 1. The acid in the acid storage barrel 19 is pumped into the pipeline mixer 16 by the acid dosing pump 12, and the acid is mixed with the sewage to neutralize the alkali in the sewage.

[0026] like Figure 1 As shown. A coagulation mixer 7 is installed in the coagulation zone 3, and the coagulant configuration and dosing system includes a coagulant dosing pump 11, a coagulant mixer 10, a coagulant storage barrel 18, an inlet pipe, a vent pipe and an overflow pipe. The inlet pipe, the vent pipe and the overflow pipe are all connected to the coagulant storage barrel 18. The coagulant mixer 10 is installed at the top of the coagulant storage barrel 18. The coagulant dosing pump 11 connects the coagulant storage barrel 18 and the coagulation zone 3. Water is transported to the coagulant storage barrel 18 through the inlet pipe to configure the coagulant. The coagulant in the coagulant storage barrel 18 is stirred and configured by the coagulant mixer 10. Finally, the coagulant is pumped into the coagulation zone 3 by the coagulant dosing pump 11 so that the coagulant is mixed with the sewage.

[0027] like Figure 1 As shown. The flocculant configuration and dosing system includes a flocculant storage barrel 17, a flocculant mixer 9, a water inlet pipe, a flocculant dosing pump 8, a vent pipe and an overflow pipe. The water inlet pipe, the vent pipe and the overflow pipe are all connected to the flocculant storage barrel 17. The flocculant mixer 9 is installed on the top of the flocculant storage barrel 17. The flocculant dosing pump 8 connects the flocculant storage barrel 17 and the flocculation area 2. The flocculant and water are stirred and mixed evenly in the flocculant storage barrel 17 by the flocculant mixer 9 and then pumped into the flocculation area 2. The flocculant is added to mix with the sewage to accelerate the precipitation of impurities in the sewage.

[0028] like Figure 1As shown. A scraper 23 is installed in the sedimentation area 1, and a sludge collection area is provided at the bottom of the sedimentation area 1. The sludge collection area is located below the scraper 23, and the scraper 23 is underwater. The scraper 23 is installed below the sewage liquid surface. The scraper 23 continuously rotates to push the sludge deposited at the bottom of the sedimentation area 1 to the sludge collection area at the edge of the sedimentation area 1, so that the sludge is accumulated, which is convenient for the sludge to be discharged.

[0029] like Figure 1 As shown. Perforated pipes are evenly arranged in the sludge collection area, and the perforated pipes are connected to the sludge centrifugal pump 22 in the equipment area 4 through pipelines. The output end of the sludge centrifugal pump 22 is connected to the outside of the equipment through flanges and pipelines. The suction end of the sludge centrifugal pump 22 extracts the sludge through the perforated pipes and discharges the sludge through the pipeline.

[0030] A method for treating highly alkaline oil-containing tunnel construction wastewater comprises the following steps: Step 1: introducing sewage into the oil removal area 5, supplying air to the perforated aeration pipe 20 through the high-pressure vortex fan 21, aerating the sewage in the oil removal area 5, and then using the float type oil skimmer 14 to collect the floating oil on the surface of the sewage, and the float type oil skimmer 14 transports the collected floating oil to the oil storage area 13 through a pipeline, and discharges the floating oil through the pipeline regularly; Step 2: After the floating oil is removed, the vertical centrifugal pump 15 and the acid dosing pump 12 are started. At this time, the sewage is fully mixed with the acid through the pipeline mixer 16. The opening degree of the acid dosing pump is adjusted according to the result of the water quality detector at the outlet of the sedimentation area 1; Step 3: The sewage mixed with the acid enters the coagulation zone 3 through the perforated partition, the coagulation mixer 7 is started, and the coagulant is transported to the coagulation zone 3 through the coagulant dosing pump 11, so that the sewage and the coagulant are mixed and then enter the flocculation zone 2; Step 4: After the sewage enters the flocculation zone 2, the flocculant dosing pump 8 is started to transport the flocculant to the flocculation zone 2, and the flocculation mixer 6 is started to stir the sewage and the flocculant, and the sewage enters the sedimentation zone 1; Step 5, the sewage flows into the sedimentation area 1 through the openings on the partition. After the sewage is separated from the mud and water by the liner, the upper clear liquid is discharged through the outlet of the sedimentation area 1, and the sludge is collected to the sludge collection area by the scraper. The sludge centrifugal pump 22 is regularly turned on to discharge the settled sludge.

Claims

1. A device for treating highly alkaline oil-containing tunnel construction wastewater, characterized in that: The invention comprises a skid-mounted base and an oil removal area (5), an oil storage area (13), a coagulation area (3), a flocculation area (2) and a sedimentation area (1) arranged on the base along the direction of wastewater treatment. The sedimentation area (1) and the flocculation area (2) as well as the flocculation area (2) and the coagulation area (3) are connected via a perforated partition. The coagulation area (3) is connected to the oil removal area (5) via a vertical centrifugal pump (15). The oil storage area (13) is connected to the oil removal area (5) via a float-type oil skimmer (14). An equipment area (4) is arranged at the end of the base. A pH adjustment system, a coagulant configuration and dosing system and a flocculant configuration and dosing system are arranged in the equipment area (4).

2. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 1, characterized in that: A perforated aeration pipe (20) is installed in the deoiling area (5), one end of the perforated aeration pipe (20) is connected to the high-pressure vortex blower (21) in the equipment area (4) via a valve, and the other end is connected to an annular aeration pipe, and openings are evenly arranged on the annular aeration pipe.

3. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 2, characterized in that: The output end of the float type oil skimmer (14) is connected to the oil storage area (13) via a hose, the outer wall of the input end is connected to a float, the floats are distributed at equal angles along the axis of the input end, and the side wall of the input end is provided with an oil inlet.

4. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 1, characterized in that: The input end of the vertical centrifugal pump (15) is connected to the inner bottom of the oil removal zone (5), and the output end is connected to the inner top of the coagulation zone (3). A pipeline mixer (16) is installed on the output end of the vertical centrifugal pump (15), and the pH adjustment system is connected to the pipeline mixer (16).

5. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 4, characterized in that: The pH adjustment system comprises an acid storage barrel (19) and an acid dosing pump (12), wherein the input end of the acid dosing pump (12) is connected to the acid storage barrel (19), and the output end of the acid dosing pump (12) is connected to the pipeline mixer (16) via a hose, and a water quality detector is installed in the sedimentation area (1).

6. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 1, characterized in that: A coagulation mixer (7) is installed in the coagulation zone (3), and the coagulant configuration and dosing system includes a coagulant dosing pump (11), a coagulant mixer (10), a coagulant storage barrel (18), a water inlet pipe, a vent pipe and an overflow pipe, wherein the water inlet pipe, the vent pipe and the overflow pipe are all connected to the coagulant storage barrel (18), the coagulant mixer (10) is installed at the top of the coagulant storage barrel (18), and the coagulant dosing pump (11) is connected to the coagulant storage barrel (18) and the coagulation zone (3).

7. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 1, characterized in that: The flocculant configuration and dosing system comprises a flocculant storage barrel (17), a flocculant mixer (9), a water inlet pipe, a flocculant dosing pump (8), a vent pipe and an overflow pipe. The water inlet pipe, the vent pipe and the overflow pipe are all connected to the flocculant storage barrel (17). The flocculant mixer (9) is installed at the top of the flocculant storage barrel (17). The flocculant dosing pump (8) is connected to the flocculant storage barrel (17) and the flocculation area (2).

8. The device for treating highly alkaline oil-containing tunnel construction wastewater according to claim 1, characterized in that: A sludge scraper (23) is installed in the sedimentation area (1), and a sludge collection area is provided at the bottom of the sedimentation area (1). The sludge collection area is located below the sludge scraper (23), and the sludge scraper (23) is an underwater type.

9. A device for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 8, characterized in that: Perforated pipes are evenly arranged in the sludge collection area, and the perforated pipes are connected to the sludge centrifugal pump (22) in the equipment area (4) through pipelines. The output end of the sludge centrifugal pump (22) is connected to the outside of the equipment through a flange and a pipeline.

10. A method for treating highly alkaline oil-containing tunnel construction wastewater as claimed in claim 1, characterized in that: The steps include: Step 1: introducing sewage into the oil removal area (5), supplying air to the perforated aeration pipe (20) through a high-pressure vortex fan (21), aerating the sewage in the oil removal area (5), and then using a float type oil skimmer (14) to collect floating oil on the surface of the sewage. The float type oil skimmer (14) transports the collected floating oil to the oil storage area (13) through a pipeline, and discharges the floating oil through the pipeline at regular intervals; Step 2: After the floating oil is removed, the vertical centrifugal pump (15) and the acid dosing pump (12) are started. At this time, the sewage is fully mixed with the acid through the pipeline mixer (16). The opening degree of the acid dosing pump is adjusted according to the result of the water quality detector at the outlet of the sedimentation area (1); Step 3: The sewage mixed with the acid enters the coagulation zone (3) through the perforated partition, the coagulation mixer (7) is started, and the coagulant is transported to the coagulation zone (3) through the coagulant dosing pump (11), so that the sewage and the coagulant are mixed and then enter the flocculation zone (2); Step 4: After the sewage enters the flocculation zone (2), the flocculant dosing pump (8) is started to transport the flocculant to the flocculation zone (2), and the flocculation mixer (6) is started to stir the sewage and the flocculant, and the sewage enters the sedimentation zone (1); Step 5: The sewage flows through the openings on the partition plate to the sedimentation zone (1). After the sewage is separated from the mud and water by the liner, the upper clear liquid is discharged through the outlet of the sedimentation zone (1). The sludge is collected in the sludge collection area by the scraper. The sludge centrifugal pump (22) is regularly turned on to discharge the settled sludge.

Images