Container type construction wastewater treatment system

Abstract

The utility model relates to the technical field of wastewater treatment equipment, in particular to a container type construction wastewater treatment system. The container type construction wastewater treatment system comprises a box body; the inside of the box body is divided into a flocculation tank, a sedimentation tank, a filter tank and a clear water buffer tank which are sequentially communicated through a plurality of partition plate structures and door body structures. According to the technical scheme, the flocculation tank, the sedimentation tank, the filter tank and the clear water buffer tank are integrally integrated in the box body, so that the whole container type construction wastewater treatment system is convenient to mount, dismount and transfer for reuse. The device has the characteristics of compact and simple structure, simplicity and convenience in installation, convenience in management, strong adaptability and stable flow state, occupies a small area, and is particularly suitable for wastewater treatment in mountainous area tunnel construction.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and in particular to a containerized construction wastewater treatment system. Background Technology

[0002] Existing construction wastewater treatment processes are inefficient, have large equipment and facilities that require significant space, and require professional personnel for management and maintenance.

[0003] Flocculation reactions can take two forms: mechanical and hydraulic. Mechanical flocculation has the advantages of being adaptable to a wide range of water volumes, from large to small, with low head loss. Optimal flocculation can be achieved using continuously variable transmissions. However, mechanical flocculation also has disadvantages: it requires mechanical devices with rotating parts, making it difficult to manufacture, costly to invest in, and requiring significant maintenance. It is more commonly used abroad than in China. Hydraulic flocculation, on the other hand, has the advantages of simple construction, no rotating parts, and requires no maintenance. Its disadvantage is poor adaptability to changes in flow rate.

[0004] Traditional sedimentation tanks have low sedimentation efficiency, require sufficient retention time, resulting in large volume and footprint. Commonly used filters such as multi-media filters, fiber ball (bundle) filters, and precision filters have limited tolerance for influent turbidity, generally not exceeding 50 mg / L, and have limited applicability and resistance to shock loads, making them prone to stratification issues. Furthermore, they require backwash pumps, and the filter media needs regular replacement, leading to high operating costs.

[0005] Currently, there is no construction wastewater treatment equipment that is small in size, has high processing efficiency, is simple to operate, highly automated, economical, and feasible, so as to achieve the standard discharge of construction wastewater. Utility Model Content

[0006] The purpose of this utility model is to provide a containerized construction wastewater treatment system. This containerized construction wastewater treatment system has the characteristics of compact and simple overall structure, easy installation, convenient management, strong adaptability, and stable flow. It also occupies little ground area and is particularly suitable for wastewater treatment in mountainous tunnel construction.

[0007] This utility model provides a containerized construction wastewater treatment system, including: a container body;

[0008] The chamber is divided into a flocculation tank, a sedimentation tank, a filtration tank, and a clear water buffer tank, which are connected in sequence, by several partition structures and door structures.

[0009] Preferably, the enclosure includes a top plate, a bottom plate, outer wall panels, partitions, and a door frame;

[0010] The top plate, bottom plate, and outer wall plate are connected by welding.

[0011] Both the partition and the door frame are installed inside the box.

[0012] Preferably, it also includes an equalization tank, and the equalization tank and the flocculation tank are connected by a sand remover and a pipeline mixer;

[0013] The sand remover is located upstream of the pipeline mixer;

[0014] The pipeline mixer is provided in at least two parts, with the upstream pipeline mixer connected to the coagulant dosing device and the downstream pipeline mixer connected to the flocculant dosing device.

[0015] More preferably, the regulating tank includes a wastewater lift pump, and the outlet pipe of the wastewater lift pump is connected to the pipeline mixer.

[0016] Preferably, the flocculation tank is provided with a plurality of flocculation compartments connected in series, and each flocculation compartment is provided with a winged partition plate connected in series vertically.

[0017] Preferably, the sedimentation tank is provided with an inclined tube in the upper middle part, a water-blocking baffle and a herringbone grid in the lower middle part, and a water tank is connected to the top of the sedimentation tank.

[0018] Preferably, the filter tank is provided with filter media in the middle and lower part, and the filtered water above the filter chamber perforated plate is also used as backwash water, utilizing the gravity flow of the height difference for backwashing.

[0019] A further preferred embodiment includes a sludge buffer tank, wherein the sludge from the sand remover, flocculation tank, sedimentation tank, and filtration tank is discharged to the sludge buffer tank through pipelines.

[0020] Both the coagulant dosing device and the flocculant dosing device are connected to the sludge buffer tank.

[0021] A further preferred embodiment includes a monitoring pool located downstream of the clear water buffer pool, the monitoring pool having a return water pipe connected to the regulating pool.

[0022] More preferably, the filter material is a bead-shaped white spherical particle made of polystyrene resin foam.

[0023] Beneficial effects:

[0024] The technical solution of this utility model integrates the flocculation tank, sedimentation tank, filtration tank and clear water buffer tank into a single container, making the entire containerized construction wastewater treatment system easy to install, disassemble, relocate and reuse.

[0025] By installing wing-shaped baffles within the flocculation tank to enhance micro-vortex density, the flocculation reaction is effectively controlled. Furthermore, by allowing water to enter from below the sedimentation tank, and by incorporating water-blocking baffles and herringbone grids, the water flow is stabilized, resulting in more uniform water replenishment and creating favorable hydraulic conditions for subsequent sedimentation, thus improving sedimentation efficiency. Additionally, by placing the filter media in the lower middle part of the filtration tank, the filter layer possesses excellent deep-layer interception capabilities. The filtered water above the filter chamber's perforated plate is simultaneously used for backwashing, utilizing gravity flow to eliminate the need for a backwash water tank and pump, saving space, cost, and operating energy. The overall structure is compact and simple, easy to install and manage, highly adaptable, and provides stable flow, while requiring minimal floor space, making it particularly suitable for wastewater treatment during tunnel construction in mountainous areas. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall process of this utility model;

[0028] Figure 2 This is a partial schematic diagram of the flocculation tank, sedimentation tank, filtration tank, and clear water buffer tank in this utility model;

[0029] Figure 3 This is a process flow diagram of the construction wastewater treatment system in this utility model;

[0030] Figure 4 This is a schematic diagram of the external structure of the box in this utility model;

[0031] Figure 5 This is a partial structural diagram of the box body in this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1: Equalization tank; 101: Wastewater lift pump;

[0034] 201: Sand separator; 202: Pipeline mixer; 203: Coagulant dosing device; 204: Flocculant dosing device;

[0035] 3: Flocculation tank; 301: Flocculation compartment; 302: Wing-shaped baffle; 303: Sludge discharge pipe; 304: Insertion guide rod;

[0036] 4: Sedimentation tank; 401: Inclined tube; 402: Water-blocking baffle; 403: Herringbone grille; 404: Inlet chamber; 405: Water distribution plate;

[0037] 5: Filter tank; 501: Filter chamber perforated plate; 502: Filter cap;

[0038] 6: Clear water buffer tank; 7: Sludge buffer tank; 8: Monitoring tank;

[0039] 9: Box body; 901: Top plate; 902: Bottom plate; 903: Outer wall panel; 904: Door frame; 905: Partition. Detailed Implementation

[0040] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] like Figures 1 to 5As shown, this utility model provides a containerized construction wastewater treatment system, which includes: a container 9, which is divided into a flocculation tank 3, a sedimentation tank 4, a filtration tank 5 and a clear water buffer tank 6 in sequence by a number of partition structures and door structures.

[0044] The technical solution of this utility model integrates the flocculation tank 3, sedimentation tank 4, filtration tank 5 and clear water buffer tank 6 into the container 9, making the entire containerized construction wastewater treatment system easy to install, disassemble, relocate and reuse.

[0045] Specifically, such as Figure 4 As shown, the enclosure 9 includes a top plate 901, a bottom plate 902, an outer wall panel 903, a partition 905, and a door frame 904. The top plate 901, the bottom plate 902, and the outer wall panel 903 are connected by welding. The partition 905 and the door frame 904 are both installed inside the enclosure 9.

[0046] The containerized construction wastewater treatment system also includes an equalization tank 1. The equalization tank 1 and the flocculation tank 3 are connected by a sand separator 2 and a pipeline mixer 202. The sand separator 2 is located upstream of the pipeline mixer 202. At least two pipeline mixers 202 are provided. The upstream pipeline mixer 202 is connected to a coagulant dosing device 203, and the downstream pipeline mixer 202 is connected to a flocculant dosing device 204. Specifically, in this embodiment, the coagulant is PAC (polyaluminum chloride), and the flocculant is PAM (polyacrylamide).

[0047] In addition, such as Figure 2 and Figure 5 As shown, the housing 9 also has separate compartments. In this embodiment, there is a compartment in front of the flocculation tank 3 and a compartment behind the filter tank 5. The coagulant dosing device 203 and the flocculant dosing device 204 are placed in the compartment in front of the flocculation tank 3, and a blower is placed in the compartment behind the filter tank 5.

[0048] The equalization tank 1 includes a wastewater lift pump 101, and the outlet pipe of the wastewater lift pump 101 is connected to the pipeline mixer 202.

[0049] The flocculation tank 3 is equipped with several flocculation chambers 301 connected in series. Each flocculation chamber 301 contains a winged baffle 302 connected vertically. Each flocculation tank 3 is further divided into several chambers, with adjacent chambers connected in series and vertically connected. Diamond-shaped winged baffles 302 are installed within each chamber, positioned using insertable guide rods 304, simplifying installation and maintenance and ensuring stable flocculation. A set of vertically connected winged baffles 302 is installed in each chamber to enhance micro-vortex density and strengthen the control of the flocculation reaction. The winglets are horizontally positioned perpendicular to the water flow direction within the chamber, while the baffles are vertically positioned parallel to the water flow direction. Inclined plates are installed between the winged baffles 302 to eliminate dead zone vortices, forming a vortex controller for the diamond-shaped winged baffles 302. This flocculation tank 3 has a short reaction time, short residence time, small reaction chamber volume, good flocculation effect, and low resistance loss. Figure 2 As shown, a sludge discharge pipe 303 is provided at the bottom of the flocculation tank 3. The sludge discharge pipe 303 is connected to the sludge buffer tank 7 and can discharge the sludge in the flocculation tank 3 into the sludge buffer tank 7.

[0050] An inclined tube 401 is installed in the upper middle part of the sedimentation tank 4, and a water-blocking baffle 402 and a herringbone grid 403 are installed in the lower middle part of the sedimentation tank 4. A water tank is connected to the top of the sedimentation tank 4. Both inclined tube 401 sedimentation and inclined plate sedimentation are shallow sedimentation technologies, but the inclined tube 401 sedimentation technology has a small Reynolds number, stable water flow, high sedimentation efficiency, and low failure rate. Specifically, in this embodiment, the inlet of the sedimentation tank 4 is located at the bottom of the sedimentation tank 4, and water enters from below. In order to stabilize the water flow and make the water replenishment more even, a water-blocking baffle 402 and a herringbone grid 403 are installed, creating good hydraulic conditions for subsequent sedimentation and improving sedimentation efficiency. Specifically, in this embodiment, the sedimentation tank 4 is inlet water through an inlet chamber 404 and a water distribution plate 405. Figure 2 As shown, the water inlet chamber 404 and the water distribution plate 405 are located on one side of the sedimentation tank 4.

[0051] The lower part of the filter tank 5 is equipped with filter media. The filtered water above the filter chamber perforated plate 501 is also used as backwash water, utilizing gravity flow to backwash. The filter media consists of bead-shaped white spherical particles made of foamed polystyrene resin. Specifically, in this embodiment, the filter media is a lightweight filter material composed of bead-shaped white spherical particles (EPS foamed plastic filter beads) made of foamed polystyrene resin. This filter media is non-toxic, does not easily age, is wear-resistant, inexpensive, has a large specific surface area, and strong adsorption capacity. The filter layer has good deep-layer interception capacity, low head loss, and can overcome the surface clogging phenomenon common in sand filters, resulting in a long filtration cycle. Specifically, in this embodiment, the water filtered by the filter chamber perforated plate 501 enters the clear water tank through the filter cap 502. The clear water tank is located above the filter cap 502 and is used for backwashing.

[0052] The containerized construction wastewater treatment system also includes a sludge buffer tank 7. Sludge from the sand separator 2, flocculation tank 3, sedimentation tank 4, and filtration tank 5 is discharged into the sludge buffer tank 7 via pipelines. Both the coagulant dosing device 203 and the flocculant dosing device 204 are connected to the sludge buffer tank 7. Specifically, in this embodiment, two sludge buffer tanks 7 are provided, which can be used alternately. Subsequent sludge is transported to a slag yard or landfilled in a low-lying area, depending on the actual site conditions. When the sludge buffer tank 7 is full, the upper water overflows into the equalization tank 1 through the sludge tank overflow pipe. Both the coagulant dosing device 203 and the flocculant dosing device 204 add chemicals to the sludge buffer tank 7 via pipelines.

[0053] The containerized construction wastewater treatment system also includes a monitoring tank 8, located downstream of the clear water buffer tank 6. The return pipe of the monitoring tank 8 is connected to the equalization tank 1. Specifically, if the water in the monitoring tank 8 passes the test, it can be discharged; if it fails the test, it needs to be returned to the equalization tank 1 through the return pipe for retreatment.

[0054] This containerized construction wastewater treatment system enhances the micro-vortex density and strengthens the control of the flocculation reaction by installing winged baffles 302 in the flocculation tank 3. Water enters from below the sedimentation tank 4, where water-blocking baffles 402 and herringbone grids 403 are installed to stabilize the water flow and ensure more uniform water replenishment, creating favorable hydraulic conditions for subsequent sedimentation and improving sedimentation efficiency. Furthermore, by placing the filter media in the lower middle part of the filter tank 5, the filter layer has excellent deep-layer interception capacity. The filtered water above the filter chamber perforated plate 501 is also used as backwash water, utilizing gravity flow to backwash, eliminating the need for a backwash water tank and pump, saving space, cost, and operating energy. The system features a compact and simple overall structure, easy installation, convenient management, strong adaptability, and stable flow, while occupying little floor space, making it particularly suitable for wastewater treatment in mountainous tunnel construction.

[0055] Process testing:

[0056] Three sets of wastewater samples were collected for testing. The test data are shown in Table 1, and the data analysis is shown in Table 2.

[0057] Table 1 Experimental Data

[0058]

[0059] Table 2 Data Analysis

[0060]

[0061] A prototype was assembled based on the containerized construction wastewater treatment system provided by this utility model. The test raw water was the discharge from a tunnel construction project, with a suspended solids content of 2000mg-9000mg / L. Through experiments, a coagulant was selected and parameters were determined. The optimal filtration and purification scheme was compared and chosen, resulting in effluent quality meeting the expected targets.

[0062] Specifically, the operation and control of this containerized construction wastewater treatment system is automated, except for manual preparation of the chemical solution. The implementation of various operating conditions is achieved through automatic switching and manual adjustment of the opening and closing states of the corresponding valves.

[0063] Ensuring compliant discharge of construction wastewater is a pressing issue. This containerized construction wastewater treatment system closely integrates with the actual project requirements and the needs of the user. Addressing the shortcomings of traditional construction wastewater treatment methods, and based on the characteristics of wastewater generation, treatment, and discharge, as well as its water quality properties, it breaks through conventional treatment methods by employing physicochemical methods such as sand removal, chemical coagulation, and shallow sedimentation as an enhanced primary treatment process. This effectively removes suspended solids and creates conditions for subsequent deep filtration treatment. Simultaneously, efficient coagulation and sedimentation remove some organic pollutants. The filtration method utilizes lightweight foam floating filter beads for upward filtration, further removing suspended solids (SS) from the water to achieve compliant discharge and meet the expected goals.

[0064] After the construction wastewater is treated by the above-mentioned treatment process, the effluent is analyzed and tested by a professional institution. The effluent quality is stable and can meet the Class I standard of the "Integrated Wastewater Discharge Standard" GB8978-1996. The effluent can be directly discharged or reused.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A containerized construction wastewater treatment system, characterized in that, include: Box; The chamber is divided into a flocculation tank, a sedimentation tank, a filtration tank, and a clear water buffer tank, which are connected in sequence, by several partition structures and door structures.

2. The containerized construction wastewater treatment system according to claim 1, characterized in that, The enclosure includes a top plate, a bottom plate, outer wall panels, partitions, and a door frame; The top plate, bottom plate, and outer wall plate are connected by welding. Both the partition and the door frame are installed on the box body.

3. The containerized construction wastewater treatment system according to claim 1, characterized in that, It also includes an equalization tank, which is connected to the flocculation tank via a sand remover and a pipe mixer; The sand remover is located upstream of the pipeline mixer; The pipeline mixer is provided in at least two parts, with the upstream pipeline mixer connected to the coagulant dosing device and the downstream pipeline mixer connected to the flocculant dosing device.

4. The containerized construction wastewater treatment system according to claim 3, characterized in that, The regulating tank includes a wastewater lift pump, and the outlet pipe of the wastewater lift pump is connected to the pipeline mixer.

5. The containerized construction wastewater treatment system according to claim 1, characterized in that, The flocculation tank is provided with several flocculation compartments connected in series. Each flocculation compartment is provided with a winged partition, which is connected in series vertically.

6. The containerized construction wastewater treatment system according to claim 1, characterized in that, The sedimentation tank is equipped with an inclined tube in the upper middle part, a water-blocking baffle and a herringbone grid in the lower middle part, and a water tank is connected to the top of the sedimentation tank.

7. The containerized construction wastewater treatment system according to claim 1, characterized in that, The filter tank is equipped with filter media in the middle and lower part, and the filtered water above the filter chamber perforated plate is used as backwash water, utilizing the gravity flow of the water due to the height difference for backwashing.

8. The containerized construction wastewater treatment system according to claim 3, characterized in that, It also includes a sludge buffer tank, and the sludge from the sand remover, flocculation tank, sedimentation tank and filtration tank are all discharged to the sludge buffer tank through pipelines; Both the coagulant dosing device and the flocculant dosing device are connected to the sludge buffer tank.

9. The containerized construction wastewater treatment system according to claim 3, characterized in that, It also includes a monitoring pool located downstream of the clear water buffer pool, and the return water pipe of the monitoring pool is connected to the regulating pool.

10. The containerized construction wastewater treatment system according to claim 7, characterized in that, The filter media consists of bead-shaped white spherical particles made of polystyrene resin foam.

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