Wastewater biochemical system

Abstract

The utility model discloses a wastewater biochemical system, and relates to the technical field of wastewater treatment, the wastewater biochemical system comprises a first anaerobic tank, a first biological contact oxidation tank, a second anaerobic tank, a second biological contact oxidation tank and a secondary sedimentation tank, the first anaerobic tank is connected with the first biological contact oxidation tank through a first internal reflux pipeline; the second anaerobic tank is also connected with the second biological contact oxidation tank through a second internal reflux pipeline; the secondary sedimentation tank is also connected with the first anaerobic tank through an outer reflux pipeline; the second anaerobic tank is connected with the first end of the second wastewater inlet branch pipe, and the second end of the first wastewater inlet branch pipe and the second end of the second wastewater inlet branch pipe are both connected with the wastewater inlet header pipe; the inner diameter of the first wastewater inlet branch pipe and the inner diameter of the second wastewater inlet branch pipe are both smaller than the inner diameter of the wastewater inlet header pipe; the second wastewater inlet branch pipe is a reducer pipe, and the inner diameter of the first end of the second wastewater inlet branch pipe is smaller than that of the second end of the second wastewater inlet branch pipe. The wastewater treatment effect can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a wastewater biochemical system. Background Art

[0002] With the rapid development of industrialization and urbanization, wastewater treatment has become an important task for environmental protection. Traditional wastewater treatment methods often have problems such as low treatment efficiency and poor treatment effect. Therefore, it is of great significance to develop an efficient wastewater biochemical treatment system. Utility Model Content

[0003] In view of the above problems, the present application provides a wastewater biochemical system to achieve the purpose of improving the wastewater treatment effect. The specific scheme is as follows:

[0004] The present application provides a wastewater biochemical system, comprising: a primary treatment unit, a secondary treatment unit and a secondary sedimentation tank,

[0005] The primary treatment unit includes: a first anaerobic tank and a first biological contact oxidation tank, and the secondary treatment unit includes: a second anaerobic tank and a second biological contact oxidation tank;

[0006] The first anaerobic tank is connected to the first end of the first wastewater inlet branch, and the first anaerobic tank, the first biological contact oxidation tank, the second anaerobic tank, the second biological contact oxidation tank, and the secondary sedimentation tank are connected in series in sequence through pipelines;

[0007] The first anaerobic tank and the first biological contact oxidation tank are also connected via a first internal reflux pipeline;

[0008] The second anaerobic tank and the second biological contact oxidation tank are also connected via a second internal reflux pipeline;

[0009] The secondary sedimentation tank is also connected to the first anaerobic tank via an external return pipe;

[0010] The second anaerobic tank is connected to the first end of the second wastewater inlet branch, and the second end of the first wastewater inlet branch and the second end of the second wastewater inlet branch are both connected to the wastewater inlet main pipe;

[0011] The inner diameter of the first wastewater inlet branch and the inner diameter of the second wastewater inlet branch are both smaller than the inner diameter of the wastewater inlet main pipe;

[0012] The second wastewater inlet branch is a reducing pipe, and the inner diameter of the first end of the second wastewater inlet branch is smaller than the inner diameter of the second end of the second wastewater inlet branch.

[0013] In a possible implementation, the first internal return pipe is a reducer.

[0014] In a possible implementation, the inner diameter of one end of the first internal recirculation pipe connected to the first biological contact oxidation tank is smaller than the inner diameter of one end of the first internal recirculation pipe connected to the first anaerobic tank.

[0015] In a possible implementation, the second internal return pipe is a reducer.

[0016] In a possible implementation, the inner diameter of one end of the second inner recirculation pipe connected to the second biological contact oxidation tank is smaller than the inner diameter of one end of the second inner recirculation pipe connected to the second anaerobic tank.

[0017] In a possible implementation, the inner diameter of the first internal reflux pipe is smaller than the inner diameter of the first wastewater inlet branch pipe.

[0018] In a possible implementation, the inner diameter of the second internal return pipe is smaller than the inner diameter of the first wastewater inlet branch pipe.

[0019] In a possible implementation, a first solenoid valve is provided on the external return pipe, and / or a second solenoid valve is provided on the first wastewater inlet branch pipe.

[0020] In a possible implementation, a discharge port is provided on the external return pipe and a third solenoid valve is provided before the discharge port.

[0021] In a possible implementation, a mud level meter is provided in the secondary sedimentation tank, a fourth solenoid valve and a flow meter are provided on the sludge discharge main pipe of the secondary sedimentation tank, and mlss sludge concentration meters are provided in the first anaerobic tank, the first biological contact oxidation tank, the second anaerobic tank and the second biological contact oxidation tank, the mud level meter, the flow meter and each of the mlss sludge concentration meters are communicatively connected to the detection signal input terminal of the control device, and the fourth solenoid valve is communicatively connected to the control signal output terminal of the control device.

[0022] By means of the above technical scheme, the wastewater biochemical system provided by the present application has a two-stage treatment unit, and realizes circulation treatment through two internal return pipes and one external return pipe, which effectively improves the wastewater treatment effect. At the same time, since the wastewater can be transported to the two-stage treatment unit respectively through two different pipes, namely the first wastewater inlet branch and the second wastewater inlet branch, the treatment efficiency of the secondary treatment unit can be guaranteed, and the proportion of the wastewater transported to the two-stage treatment unit can be flexibly adjusted according to actual needs. The inner diameters of the two wastewater inlet branches are both smaller than the inner diameter of the wastewater inlet main pipe, which can effectively ensure the wastewater flow rate in the wastewater inlet branch and avoid blockage. The present application also increases the wastewater flow rate at the end of the second wastewater inlet branch by reducing the pipe diameter, which can effectively increase the mixing speed of the newly-incoming wastewater in the second anaerobic tank, so as to further improve the reaction effect, and then improve the wastewater treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of the structure of a wastewater biochemical system provided in this application.

[0025] Reference numerals:

[0026] 100-primary treatment unit; 200-secondary treatment unit; 300-second sedimentation tank; 110-first anaerobic tank; 120-first biological contact oxidation tank; 210-second anaerobic tank; 220-second biological contact oxidation tank; 130-first wastewater inlet branch; 230-second wastewater inlet branch; 140-first internal return pipe; 240-second internal return pipe; 400-external return pipe; 500-wastewater inlet main pipe; 410-first solenoid valve; 131-second solenoid valve; 420-third solenoid valve. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0028] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0029] like Figure 1As shown, the present application provides a wastewater biochemical system, including: a primary treatment unit 100, a secondary treatment unit 200 and a secondary sedimentation tank 300,

[0030] The primary treatment unit 100 includes: a first anaerobic tank 110 and a first biological contact oxidation tank 120, and the secondary treatment unit 200 includes: a second anaerobic tank 210 and a second biological contact oxidation tank 220;

[0031] The first anaerobic tank 110 is connected to the first end of the first wastewater inlet branch 130, and the first anaerobic tank 110, the first biological contact oxidation tank 120, the second anaerobic tank 210, the second biological contact oxidation tank 220, and the secondary sedimentation tank 300 are sequentially connected in series through pipelines.

[0032] The wastewater first enters the first anaerobic tank 110 for preliminary treatment, then passes through the first biological contact oxidation tank 120, the second anaerobic tank 210, the second biological contact oxidation tank 220 in sequence, and finally enters the secondary sedimentation tank 300 for solid-liquid separation.

[0033] In the first anaerobic tank 110, the wastewater undergoes preliminary biological treatment under anoxic conditions, mainly using denitrifying bacteria to reduce nitrate in the wastewater to nitrogen gas to achieve denitrification. The principle of the second anaerobic tank 210 is the same as that of the first anaerobic tank 110, and will not be repeated.

[0034] The first biological contact oxidation pond 120 operates under aerobic conditions and utilizes aerobic bacteria to remove organic matter in the wastewater. The principle of the second biological contact oxidation pond 220 is the same as that of the first biological contact oxidation pond 120 and will not be described in detail.

[0035] The first anaerobic tank 110 and the first biological contact oxidation tank 120 are also connected via a first internal return pipe 140;

[0036] The second anaerobic tank 210 and the second biological contact oxidation tank 220 are also connected via a second internal return pipe 240;

[0037] The secondary sedimentation tank 300 is also connected to the first anaerobic tank 110 via an external return pipe 400;

[0038] The second anaerobic tank 210 is connected to the first end of the second wastewater inlet branch 230, and the second end of the first wastewater inlet branch 130 and the second end of the second wastewater inlet branch 230 are both connected to the wastewater inlet main pipe 500;

[0039] The inner diameter of the first wastewater inlet branch 130 and the inner diameter of the second wastewater inlet branch 230 are both smaller than the inner diameter of the wastewater inlet main pipe 500;

[0040] The second wastewater inlet branch 230 is a reducing pipe, and the inner diameter of the first end of the second wastewater inlet branch 230 is smaller than the inner diameter of the second end of the second wastewater inlet branch 230 .

[0041] In practical applications, the diameter-changing positions of the various diameter-changing pipes mentioned in this application may be various, such as the front section, the middle section, and the rear section, which are not limited in this application. For example, the second wastewater inlet branch 230 may be diameter-changed at a rear section (such as the rear third section) to increase the flow rate of the rear end outlet (i.e., the first end of the second wastewater inlet branch 230).

[0042] In the primary treatment unit 100, the first anaerobic tank 110 is connected to the first end of the first wastewater inlet branch 130, and the first wastewater inlet branch 130 is used to introduce wastewater into the first anaerobic tank 110. The first anaerobic tank 110 is connected to the first biological contact oxidation tank 120 through a first internal return pipe 140, which is used to return part of the mixed liquid in the first biological contact oxidation tank 120 to the first anaerobic tank 110, so as to increase the biomass and organic matter concentration in the biological contact oxidation tank and improve the treatment effect.

[0043] In the secondary treatment unit 200, the second anaerobic tank 210 is connected to the first end of the second wastewater inlet manifold 230, and the second wastewater inlet manifold 230 is used to introduce wastewater into the second anaerobic tank 210. The second anaerobic tank 210 is connected to the second biological contact oxidation tank 220 through a second internal return pipe 240, which is used to return part of the mixed liquid in the second biological contact oxidation tank 220 to the second anaerobic tank 210, which also plays a role in increasing the biomass and organic matter concentration.

[0044] The secondary sedimentation tank 300 is connected to the first anaerobic tank 110 via an external return pipe 400 for returning part of the sludge in the secondary sedimentation tank 300 to the first anaerobic tank 110 to maintain the sludge concentration and biological activity of the system.

[0045] In the present application, the first wastewater inlet branch 130 and the second wastewater inlet branch 230 are both connected to the wastewater inlet main pipe 500, but the inner diameters of the first wastewater inlet branch 130 and the second wastewater inlet branch 230 are smaller than the inner diameter of the wastewater inlet main pipe 500, which is conducive to regulating the wastewater flow entering the primary treatment unit 100 and the secondary treatment unit 200, and ensuring the treatment effect of the two treatment units.

[0046] Optionally, the wastewater biochemical system provided in the embodiment of the present application can treat a variety of wastewaters, such as Lyocell wastewater.

[0047] In particular, the second wastewater inlet branch 230 is a reducer, the inner diameter of the first end of which is smaller than the inner diameter of the second end. This design can increase the impact force of wastewater when it enters the second anaerobic tank 210, which is beneficial to the uniform distribution and mixing of wastewater.

[0048] In addition, this application also adopts a series of variable diameter pipeline designs.

[0049] In a possible implementation, the first internal return pipe 140 is a reducer.

[0050] In a possible implementation, the inner diameter of one end of the first inner return pipe 140 connected to the first biological contact oxidation tank 120 is smaller than the inner diameter of one end of the first inner return pipe 140 connected to the first anaerobic tank 110 .

[0051] The first inner return pipe 140 is a reducer, and the inner diameter of the end connected to the biological contact oxidation tank is smaller than the inner diameter of the end connected to the anaerobic tank. This design can reduce the flow rate of the end of the first inner return pipe 140 connected to the first anaerobic tank 110, thereby avoiding the transfer of oxygen generated by a large flow rate, thereby ensuring the purification effect of the first anaerobic tank 110.

[0052] In a possible implementation, the second internal return pipe 240 is a reducer.

[0053] In a possible implementation, the inner diameter of one end of the second inner return pipe 240 connected to the second biological contact oxidation tank 220 is smaller than the inner diameter of one end of the second inner return pipe 240 connected to the second anaerobic tank 210 .

[0054] The second inner return pipe 240 is a reducer, and the inner diameter of the end connected to the biological contact oxidation tank is smaller than the inner diameter of the end connected to the anaerobic tank. This design can reduce the flow rate of the end of the second inner return pipe 240 connected to the second anaerobic tank 210, thereby avoiding the transfer of oxygen generated by a large flow rate, thereby ensuring the purification effect of the second anaerobic tank 210.

[0055] Optionally, the first inner return pipe 140 and the second inner return pipe 240 may be reduced in diameter in the middle section to further reduce the flow rate.

[0056] In a possible implementation, the inner diameter of the first inner return pipe 140 is smaller than the inner diameter of the first wastewater inlet branch 130 .

[0057] In a possible implementation, the inner diameter of the second inner return pipe 240 is smaller than the inner diameter of the first wastewater inlet branch 130 .

[0058] The following are some examples of nominal diameters of pipes mentioned in this application:

[0059] The first wastewater inlet branch 130 is DN250;

[0060] The first end of the second wastewater inlet branch 230 is DN150, and the second end is DN200;

[0061] One end of the first internal return pipe 140 connected to the first anaerobic tank 110 is DN200, and one end of the first internal return pipe 140 connected to the first biological contact oxidation tank 120 is DN150;

[0062] One end of the second internal return pipe 240 connected to the second anaerobic tank 210 is DN200, and one end of the second internal return pipe 240 connected to the second biological contact oxidation tank 220 is DN150;

[0063] The wastewater inlet main 500 is DN300.

[0064] In a possible implementation, a first solenoid valve 410 is disposed on the external return pipe 400 , and / or a second solenoid valve 131 is disposed on the first wastewater inlet branch 130 .

[0065] The amount of water flowing back can be controlled by the first solenoid valve 410 .

[0066] Through the second solenoid valve 131 , the present application can flexibly adjust the ratio of wastewater delivered to the two-stage treatment units according to actual needs.

[0067] After field tests, the overall removal rate was the highest when the ratio of the wastewater volume of the primary treatment unit 100 to the secondary treatment unit 200 was 4:6. After the test, the overall removal rate increased by about 12%, and the removal rate of total nitrogen and total phosphorus in the secondary treatment unit 200 increased by about 30%.

[0068] In a possible implementation, a discharge port is disposed on the external return pipe 400 and a third solenoid valve 420 is disposed before the discharge port.

[0069] The opening and closing of the discharge port can be controlled by the third solenoid valve 420 .

[0070] In a possible implementation, a mud level meter is provided in the secondary sedimentation tank 300, a fourth solenoid valve and a flow meter are provided on the sludge discharge main pipe of the secondary sedimentation tank 300, and mlss sludge concentration meters are provided in the first anaerobic tank 110, the first biological contact oxidation tank 120, the second anaerobic tank 210 and the second biological contact oxidation tank 220, the mud level meter, the flow meter and each of the mlss sludge concentration meters are communicatively connected to the detection signal input terminal of the control device, and the fourth solenoid valve is communicatively connected to the control signal output terminal of the control device.

[0071] The mud level meter can monitor the sludge height in the secondary sedimentation tank 300 in real time. A fourth solenoid valve and a flow meter are provided on the sludge discharge main pipe of the secondary sedimentation tank 300, which are used to control the flow rate of the sludge discharge and monitor the real-time flow rate of the sludge discharge, respectively. At the same time, mlss sludge concentration meters are provided in the first anaerobic tank 110, the first biological contact oxidation tank 120, the second anaerobic tank 210 and the second biological contact oxidation tank 220, which are used to monitor the sludge concentration in each treatment unit in real time.

[0072] These detection devices are all connected to the control device, which automatically adjusts the opening and closing of the solenoid valve and the flow rate according to the real-time monitoring data to achieve stable operation and efficient processing of the system.

[0073] Through the wastewater biochemical system of the present application, wastewater can be treated by multiple treatment units to achieve efficient, energy-saving and environmentally friendly wastewater treatment effects.

[0074] The wastewater biochemical system provided by the present application has a two-stage treatment unit, and realizes circulation treatment through two internal return pipes and one external return pipe, which effectively improves the wastewater treatment effect. At the same time, since the wastewater can be transported to the two-stage treatment unit respectively through two different pipes, namely the first wastewater inlet branch and the second wastewater inlet branch, the treatment efficiency of the secondary treatment unit can be guaranteed, and the proportion of the wastewater transported to the two-stage treatment unit can be flexibly adjusted according to actual needs. The inner diameters of the two wastewater inlet branches are both smaller than the inner diameter of the wastewater inlet main pipe, which can effectively ensure the wastewater flow rate in the wastewater inlet branch and avoid blockage. The present application also increases the wastewater flow rate at the end of the second wastewater inlet branch by reducing the pipe diameter, which can effectively increase the mixing speed of the newly-incoming wastewater in the second anaerobic tank, so as to further improve the reaction effect, thereby improving the wastewater treatment effect.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. It should also be noted that the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0076] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0077] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A wastewater biochemical system, characterized in that: include: Primary treatment unit, secondary treatment unit and secondary sedimentation tank, The primary treatment unit includes: a first anaerobic tank and a first biological contact oxidation tank, and the secondary treatment unit includes: a second anaerobic tank and a second biological contact oxidation tank; The first anaerobic tank is connected to the first end of the first wastewater inlet branch, and the first anaerobic tank, the first biological contact oxidation tank, the second anaerobic tank, the second biological contact oxidation tank, and the secondary sedimentation tank are connected in series in sequence through pipelines; The first anaerobic tank and the first biological contact oxidation tank are also connected via a first internal reflux pipeline; The second anaerobic tank and the second biological contact oxidation tank are also connected via a second internal reflux pipeline; The secondary sedimentation tank is also connected to the first anaerobic tank via an external return pipe; The second anaerobic tank is connected to the first end of the second wastewater inlet branch, and the second end of the first wastewater inlet branch and the second end of the second wastewater inlet branch are both connected to the wastewater inlet main pipe; The inner diameter of the first wastewater inlet branch and the inner diameter of the second wastewater inlet branch are both smaller than the inner diameter of the wastewater inlet main pipe; The second wastewater inlet branch is a reducing pipe, and the inner diameter of the first end of the second wastewater inlet branch is smaller than the inner diameter of the second end of the second wastewater inlet branch.

2. The wastewater biochemical system according to claim 1, characterized in that: The first internal reflux pipe is a reducing pipe.

3. The wastewater biochemical system according to claim 2, characterized in that: The inner diameter of one end of the first internal recirculation pipe connected to the first biological contact oxidation tank is smaller than the inner diameter of one end of the first internal recirculation pipe connected to the first anaerobic tank.

4. The wastewater biochemical system according to claim 1, characterized in that: The second internal reflux pipe is a reducing pipe.

5. The wastewater biochemical system according to claim 4, characterized in that: The inner diameter of one end of the second internal recirculation pipe connected to the second biological contact oxidation tank is smaller than the inner diameter of one end of the second internal recirculation pipe connected to the second anaerobic tank.

6. The wastewater biochemical system according to claim 1, characterized in that: The inner diameter of the first internal reflux pipe is smaller than the inner diameter of the first wastewater inlet branch pipe.

7. The wastewater biochemical system according to claim 1, characterized in that: The inner diameter of the second internal reflux pipe is smaller than the inner diameter of the first wastewater inlet branch pipe.

8. The wastewater biochemical system according to claim 1, characterized in that: The external return pipe is provided with a first solenoid valve, and / or the first wastewater inlet branch is provided with a second solenoid valve.

9. The wastewater biochemical system according to claim 1, characterized in that: The external return pipe is provided with a discharge port and a third solenoid valve is provided before the discharge port.

10. The wastewater biochemical system according to claim 1, characterized in that: A mud level meter is provided in the secondary sedimentation tank, a fourth solenoid valve and a flow meter are provided on the sludge discharge main pipe of the secondary sedimentation tank, and mlss sludge concentration meters are provided in the first anaerobic tank, the first biological contact oxidation tank, the second anaerobic tank and the second biological contact oxidation tank. The mud level meter, the flow meter and each mlss sludge concentration meter are communicatively connected to the detection signal input terminal of the control device, and the fourth solenoid valve is communicatively connected to the control signal output terminal of the control device.

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