Heavy metal comprehensive wastewater treatment integrated device

Abstract

The utility model relates to the technical field of heavy metal wastewater treatment, and provides a heavy metal comprehensive wastewater treatment integrated device which comprises a tank body, and a mixed reaction tank, a sedimentation tank, a sand filter tank and an ion reaction tank are arranged in the tank body; a waste water inlet is formed in the mixed reaction tank, water flow in the mixed reaction tank flows in an S shape, waste water in the mixed reaction tank enters the sedimentation tank through overflow, a sludge backflow assembly communicated with the mixed reaction tank is arranged in the sedimentation tank, waste water in the sedimentation tank enters the sand filter through overflow, and the sand filter is communicated with the sludge backflow assembly. The bottom of the sand filter tank is communicated with the bottom of the ion reaction tank, and purified water in the ion reaction tank is discharged through overflow; the bottoms of the mixed reaction tank, the sedimentation tank and the sand filter tank are all connected with an aeration assembly. The method has the advantages of simple process, low skill requirements of operators, stable and reliable equipment operation and low operation and maintenance cost.

Description

Technical Field

[0001] This application belongs to the field of heavy metal wastewater treatment technology, and more specifically, relates to an integrated device for comprehensive heavy metal wastewater treatment. Background Technology

[0002] my country has a large number of mines. During the mining process, human disturbance to the mines can lead to the overflow of wastewater containing heavy metals from the pits and tunnels due to rainwater leaching, soaking, and mine water inflow. In addition, during the closure and sealing of mines, some mine water may leak and overflow due to technical reasons. This type of wastewater has a low pH and generally contains a variety of heavy metals such as iron, manganese, cadmium, copper, and antimony. Its composition is complex and its distribution is relatively dispersed, making centralized treatment difficult. Direct discharge of such wastewater will cause pollution to downstream rivers, lakes, and farmland, and endanger the safety of surrounding residents, resulting in watershed-wide mine water pollution.

[0003] Currently, the main method for removing iron and manganese from wastewater in China is through catalytic oxidation using manganese sand filters. For wastewater containing multiple heavy metals such as cadmium, copper, and antimony, coagulation sedimentation filtration is the primary method. In particular, for low-concentration wastewater, a dual-membrane filtration system is required to treat it to meet discharge standards. However, traditional membrane filtration equipment is complex, requires highly skilled operators, and equipment failures can disrupt normal operation, resulting in high operating and maintenance costs.

[0004] Therefore, there is a need to develop an integrated special-purpose equipment with low manufacturing, operation and maintenance costs that can simultaneously process multiple heavy metals such as iron, manganese, cadmium, copper and antimony. Utility Model Content

[0005] In view of the technical problem that the cost of membrane treatment systems for heavy metal wastewater is too high in the prior art, the purpose of this application is to provide an integrated device for the comprehensive treatment of heavy metal wastewater.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: An integrated heavy metal wastewater treatment device is provided, comprising: a tank body, wherein the tank body is equipped with a mixing reaction tank, a sedimentation tank, a sand filter tank, and an ion reaction tank; the mixing reaction tank is provided with a wastewater inlet, the water flow in the mixing reaction tank is S-shaped, the wastewater in the mixing reaction tank overflows into the sedimentation tank, the sedimentation tank is equipped with a sludge return component connected to the mixing reaction tank, the wastewater in the sedimentation tank overflows into the sand filter tank, the bottom of the sand filter tank is connected to the bottom of the ion reaction tank, and the purified water in the ion reaction tank overflows; the bottoms of the mixing reaction tank, sedimentation tank, and sand filter tank are all connected to aeration components.

[0007] In one embodiment, the mixing reaction tank is provided with a plurality of staggered baffles, which are staggered laterally or longitudinally to make the water flow in an S-shape.

[0008] In one embodiment, the partition is a PP partition or a PE partition.

[0009] In one embodiment, the bottom inner wall of the sedimentation tank is configured in a funnel shape, and the sludge return assembly includes at least a sludge return pipe, one end of which is disposed in the funnel shape and the other end is disposed at the top of the mixing reaction tank.

[0010] In one embodiment, one end of the sludge return pipe is provided with an inverted funnel, the funnel is placed in the sludge, and the air outlet of the aeration assembly in the sedimentation tank is placed in the funnel.

[0011] In one embodiment, the sedimentation tank is provided with a sludge discharge pipe at the bottom.

[0012] In one embodiment, a sedimentation outlet tank and a sand filter inlet tank are respectively provided on both sides of the partition wall between the sedimentation tank and the sand filter tank, and the height of the sedimentation outlet tank is higher than the height of the sand filter inlet tank.

[0013] In one embodiment, the height of the sedimentation outlet tank is at least 150 mm higher than the height of the sand filter inlet tank.

[0014] In one embodiment, multiple ion reaction tanks are arranged side by side, and each ion reaction tank is equipped with an ion exchange reaction bed. Wastewater flows in each ion reaction tank by means of bottom inlet and top outlet.

[0015] In one embodiment, the aeration assembly includes at least a blower and several air ducts, with two blowers used alternately.

[0016] The beneficial effects of the integrated heavy metal wastewater treatment device provided in this application are as follows:

[0017] 1. The mixing reaction tank, sedimentation tank, sand filter tank and ion reaction tank all use conventional components, which has the advantages of simple process, low skill requirements for operators, stable and reliable equipment operation and low operation and maintenance costs.

[0018] 2. The same aeration component is used in the mixing reaction tank, sedimentation tank, and sand filter tank, which reduces costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0020] Figure 1 A simplified top view of the integrated heavy metal wastewater treatment device provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the layout of each gas pipe in the integrated heavy metal wastewater treatment device provided in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the internal water flow structure of the integrated heavy metal wastewater treatment device provided in the embodiments of this application.

[0023] The following are the labeling elements in the figure:

[0024] 1. Tank body; 2. Mixing reaction tank; 21. Wastewater inlet; 22. Baffle plate; 3. Sedimentation tank; 31. Sludge discharge pipe; 32. Sedimentation outlet tank; 33. Water inlet channel; 4. Sand filter tank; 41. Sand filter inlet tank; 42. Backwash drainage tank; 43. Backwash water pipe; 5. Ion reaction tank; 51. Ion exchange reaction bed; 6. Sludge return assembly; 61. Sludge return pipe; 62. Funnel; 7. Aeration assembly; 71. Stirring air pipe; 72. Air lift air pipe; 73. Backwash air pipe. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] like Figures 1-3 As shown in the illustration, an integrated device for treating heavy metal wastewater according to an embodiment of this application will now be described. This integrated device for treating heavy metal wastewater includes: a tank body 1, within which a mixing reaction tank 2, a sedimentation tank 3, a sand filter tank 4, and an ion reaction tank 5 are provided. Figure 3 As shown, when the length of tank 1 is sufficient, the mixing reaction tank 2, sedimentation tank 3, sand filter tank 4, and ion reaction tank 5 are arranged in a straight line; as shown... Figure 1 As shown, when the length of tank 1 is insufficient but the width is sufficient, the mixing reaction tank 2 and sedimentation tank 3 are arranged in a straight line, and the sand filter tank 4 and ion reaction tank 5 are arranged in a straight line. The specific layout can be selected according to the size of tank 1, so that the layout structure is compact.

[0030] In this embodiment, as Figures 1-3 As shown, the mixing reaction tank 2 is equipped with a wastewater inlet 21. The wastewater, after pretreatment such as grit removal, enters the equalization tank and is then pumped into the mixing reaction tank 2 through the wastewater inlet 21 by a lift pump. The wastewater in the mixing reaction tank 2 flows in an S-shape, which increases the reaction time and improves the coagulation effect. The wastewater in the mixing reaction tank 2 overflows into the sedimentation tank 3.

[0031] In this embodiment, the sedimentation tank 3 is equipped with a sludge return assembly 6 that is connected to the mixing reaction tank 2 for sludge return and reuse. The wastewater in the sedimentation tank 3 overflows into the sand filter tank 4. The bottom of the sand filter tank 4 is connected to the bottom of the ion reaction tank 5. The sand filter tank 4 filters solid impurities, and the ion reaction tank 5 is used to separate metal ions. The purified water in the ion reaction tank 5 overflows and is discharged through the overflow trough.

[0032] The bottoms of the mixing reaction tank 2, sedimentation tank 3, and sand filter 4 are all connected to aeration components 7. The mixing reaction tank 2 is connected to aeration components 7, which agitate the wastewater within the tank, improving coagulation efficiency. Simultaneously, aeration helps oxidize heavy metal pollutants containing iron and manganese, leading to iron and manganese precipitation, facilitating subsequent removal. Replacing conventional mechanical agitation with aeration reduces costs and simplifies installation and maintenance. The sedimentation tank 3 is connected to aeration components 7, enabling sludge recirculation via gas, eliminating the need for conventional sludge lift pumps, reducing costs, and allowing for smaller flow control of the sludge-water mixture. This increases coagulation nuclei, enhances the coagulation effect, and achieves energy savings, lower equipment investment, and reduced operation and maintenance workload. The sand filter 4 is connected to aeration components 7, allowing for backwashing via gas to ensure proper filtration and treatment.

[0033] In this embodiment, the mixing reaction tank 2 is provided with several staggered baffles 22. The baffles 22 are staggered with the openings on the side wall of the tank body 1 in a horizontal or vertical manner to make the water flow in an S-shape. The baffles 22 are PP baffles or PE baffles, which reduces the manufacturing cost.

[0034] In this embodiment, a water inlet channel 33 is formed in the sedimentation tank 3 by a partition vertical plate. The water inlet channel 33 is connected to the mixing reaction tank 2. The purpose of the water inlet channel 33 is to guide the incoming water to the lower part of the sedimentation tank 3, ensuring that the upper part of the sedimentation tank 3 is not disturbed by the incoming water, thus achieving natural sedimentation. The bottom inner wall of the sedimentation tank 3 is set in a funnel shape, which facilitates the accumulation of sediment. The sludge return assembly 6 includes at least a sludge return pipe 61. One end of the sludge return pipe 61 is set in the funnel shape, and the other end is set at the top of the mixing reaction tank 2, for returning part of the sludge in the sedimentation tank 3. Specifically, in this embodiment, sludge return is achieved by air lifting. One end of the sludge return pipe 61 is provided with an inverted funnel 62, which is placed in the sludge. The air outlet of the aeration assembly 7 in the sedimentation tank 3 is placed in the funnel 62. The airflow generated by the aeration assembly 7 flows into the sludge return pipe 61 through the funnel 62, thereby realizing air lifting return.

[0035] In this embodiment, the bottom of the sedimentation tank 3 is provided with a sludge discharge pipe 31, which is used to discharge the settled sludge into a sludge treatment tank or equipment.

[0036] In this embodiment, a sedimentation outlet tank 32 and a sand filter inlet tank 41 are respectively provided on both sides of the partition wall between the sedimentation tank 3 and the sand filter tank 4. The height of the sedimentation outlet tank 32 is higher than the height of the sand filter inlet tank 41. Specifically, the height of the sedimentation outlet tank 32 is at least 150mm higher than the height of the sand filter inlet tank 41. The purpose of this arrangement is to achieve uniform water distribution and low water flow resistance by using an integrated effluent and inlet configuration.

[0037] In this embodiment, multiple ion reaction tanks 5 are arranged side by side to ensure the treatment effect; each ion reaction tank 5 is equipped with an ion exchange reaction bed 51, which is modularly arranged for easy replacement; wastewater flows in each ion reaction tank 5 through bottom inlet and top outlet to ensure that the clean water overflows from the top.

[0038] In this embodiment, the aeration component 7 includes at least a blower and several air pipes. Two blowers are provided, used alternately, so that one is in use while the other is on standby for emergency situations. The several air pipes are respectively connected to the mixing reaction tank 2, the sedimentation tank 3, and the sand filter 4. Among them, the air pipe connected to the mixing reaction tank 2 is called the stirring air pipe 71, and the stirring air pipe 71 is arranged in an S-shape; the air pipe connected to the sedimentation tank 3 is called the air lift air pipe 72, and the air lift air pipe 72 is inserted into the funnel 62; the air pipe connected to the sand filter 4 is called the backwash air pipe 73, and the backwash air pipe 73 is used to realize air backwashing; in this embodiment, the upper part of the sand filter 4 is also provided with a backwash drainage trough 42, and the lower part of the sand filter 4 is connected to a backwash water pipe 43. The backwash water pipe 43 is connected to a water source, which can perform water backwashing on the sand filter 4, and the backwash water can be discharged through the backwash drainage trough 42. In the embodiment, the aeration component 7 uses a single blower that serves as a mixer, provides iron and manganese oxide, sludge return, and provides air for sand filter backwashing. This results in high equipment utilization, simplified system equipment configuration, simple equipment operation and maintenance, low investment, and low operating costs.

[0039] For projects with large flow rates, this device can be connected in parallel to achieve compliance treatment.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated device for treating heavy metal wastewater, characterized in that, include: The tank body (1) is equipped with a mixing reaction tank (2), a sedimentation tank (3), a sand filter tank (4) and an ion reaction tank (5). The mixing reaction tank (2) is equipped with a wastewater inlet (21). The water flow in the mixing reaction tank (2) is S-shaped. The wastewater in the mixing reaction tank (2) overflows into the sedimentation tank (3). The sedimentation tank (3) is equipped with a sludge return assembly (6) connected to the mixing reaction tank (2). The wastewater in the sedimentation tank (3) overflows into the sand filter tank (4). The bottom of the sand filter tank (4) is connected to the bottom of the ion reaction tank (5). The purified water in the ion reaction tank (5) overflows out. The bottoms of the mixing reaction tank (2), the sedimentation tank (3) and the sand filter tank (4) are all connected to an aeration assembly (7).

2. The integrated heavy metal wastewater treatment device as described in claim 1, characterized in that: The mixing reaction tank (2) is provided with several staggered baffles (22), which are staggered laterally or longitudinally to make the water flow in an S-shape.

3. The integrated heavy metal wastewater treatment device as described in claim 2, characterized in that: The partition (22) is a PP partition or a PE partition.

4. The integrated heavy metal wastewater treatment device as described in claim 1, characterized in that: The bottom inner wall of the sedimentation tank (3) is configured in a funnel shape. The sludge return assembly (6) includes at least a sludge return pipe (61). One end of the sludge return pipe (61) is located in the funnel shape, and the other end is located at the top of the mixing reaction tank (2).

5. The integrated heavy metal wastewater treatment device as described in claim 4, characterized in that: One end of the sludge return pipe (61) is provided with an inverted funnel (62), which is placed in the sludge, and the air outlet of the aeration component (7) in the sedimentation tank (3) is placed in the funnel (62).

6. The integrated heavy metal wastewater treatment device as described in claim 5, characterized in that: The sedimentation tank (3) is equipped with a sludge discharge pipe (31) at the bottom.

7. The integrated heavy metal wastewater treatment device as described in claim 6, characterized in that: The sedimentation tank (3) and the sand filter tank (4) are respectively provided with a sedimentation outlet tank (32) and a sand filter inlet tank (41) on both sides of the partition wall. The height of the sedimentation outlet tank (32) is higher than the height of the sand filter inlet tank (41).

8. The integrated heavy metal wastewater treatment device as described in claim 7, characterized in that: The height of the sedimentation outlet tank (32) is at least 150 mm higher than the height of the sand filter inlet tank (41).

9. The integrated heavy metal wastewater treatment device as described in any one of claims 1-8, characterized in that: Multiple ion reaction tanks (5) are arranged side by side, and each ion reaction tank (5) is equipped with an ion exchange reaction bed (51). Wastewater flows in each ion reaction tank (5) by entering water from the bottom and exiting water from the top.

10. The integrated heavy metal wastewater treatment device as described in claim 9, characterized in that: The aeration assembly (7) includes at least a blower and several air ducts, with two blowers installed and used alternately.

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