High-density precipitation wastewater treatment system

Abstract

The utility model belongs to the technical field of water treatment, and relates to a high-density precipitation wastewater treatment system which comprises a pretreatment unit, a flocculation reaction tank, a post-treatment unit and an aeration assembly, the flocculation reaction tank is communicated with a water outlet of the pretreatment unit; the post-treatment unit is communicated with the water outlet of the flocculation reaction tank through a flow guide port; the aeration assembly is arranged in the flocculation reaction tank and close to the flow guide port, and is used for providing airflow into the flocculation reaction tank; the aeration assembly is arranged, when bubbles generated by aeration of the aeration assembly rise in water, surrounding sludge flocs can be driven to rise together, the sludge flocs are prevented from being deposited on the edge of the flow guide opening, meanwhile, the sludge flocs are kept in a uniform dispersion state in the flocculation reaction tank under the continuous disturbance effect of airflow, and the flocculation reaction effect is improved. Sludge flocs can conveniently pass through the flow guide port along with water flow, so that the risk of blockage of the flow guide port is further reduced, and the problems of overflow and secondary pollution of the flocculation reaction tank caused by blockage of the flow guide port are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, concretely relates to a high density sedimentation wastewater treatment system. BACKGROUND

[0002] In the field of inorganic wastewater treatment, the high-density sedimentation tank, as the core facility in the wastewater purification process, is used to remove suspended solids, colloidal substances and part of dissolved pollutants in wastewater, and is the key link to improve water quality and ensure wastewater discharge up to standard. The high-density sedimentation tank, through the three core components of the carefully designed rapid mixing zone, flocculation reaction zone and sedimentation separation zone, cooperates to realize efficient flocculation and sedimentation process.

[0003] The prior art has certain research on the structure of the high-density sedimentation tank. Referring to the patent document with the application number 202311477218.1, a high-density sedimentation tank is disclosed, which includes a coagulation tank, a coagulation mixer configured to mix the coagulant with the incoming water thoroughly, a flocculation tank connected downstream of the coagulation tank and in fluid communication with the coagulation tank, the flocculation tank including a flocculation mixer configured to mix the coagulation tank effluent with the flocculant and the return sludge thoroughly, and a sedimentation zone connected downstream of the flocculation tank and in fluid communication with the flocculation tank, in which the suspended solids in the water are precipitated, and the clear water flows out of the high-density sedimentation tank through the inclined pipe arranged in the sedimentation zone.

[0004] Therefore, by optimizing the configuration of the coagulation mixer and the flocculation mixer, the wastewater treatment efficiency and water quality purification effect are improved. However, during daily operation, most of the sludge flocs will pass through the guide opening of the flocculation reaction tank with the water flow, and a small part of the sludge flocs will deposit on the edge of the guide opening. Over a long period of time, the accumulated sludge flocs will gradually block the guide opening, eventually leading to overflow of the flocculation reaction tank and causing secondary pollution to the surrounding environment. UTILITY MODEL CONTENTS

[0005] To solve the technical problem in the background art that a small part of the sludge flocs deposits around the guide opening during daily operation, and the long-term accumulation of sludge blocks the guide opening, causing overflow of the flocculation reaction tank, the utility model provides a high-density sedimentation wastewater treatment system.

[0006] The high-density sedimentation wastewater treatment system of the utility model is provided with an aeration assembly. When the bubbles generated by the aeration assembly rise in the water, they will carry the surrounding sludge flocs upward, preventing the sludge flocs from depositing on the edge of the guide opening. At the same time, the continuous disturbance of the airflow causes the sludge flocs to maintain a uniformly dispersed state in the flocculation reaction tank, facilitating the sludge flocs to pass through the guide opening with the water flow, further reducing the risk of guide opening blockage, and avoiding the problems of overflow of the flocculation reaction tank and secondary pollution caused by guide opening blockage.

[0007] To solve the above technical problems, the utility model provides the following technical scheme:

[0008] A high-density sedimentation wastewater treatment system, comprising a pretreatment unit, a flocculation reaction tank and an aeration assembly; the pretreatment unit is used for removing part of impurities in inorganic wastewater; the flocculation reaction tank is communicated with a water outlet of the pretreatment unit, and is used for promoting suspended solids and colloidal substances in wastewater to form sludge flocs; a post-treatment unit is communicated with a water outlet of the flocculation reaction tank through a flow guide port, and is used for further separating sludge and wastewater; the aeration assembly is arranged in the flocculation reaction tank at a position close to the flow guide port, and is used for providing airflow into the flocculation reaction tank.

[0009] In one specific implementation, the aeration assembly comprises an aeration pipeline and a gas conveying pipeline; the aeration pipeline is arranged in the flocculation reaction tank; the gas conveying pipeline is communicated with an air inlet end of the aeration pipeline, and is used for conveying gas into the aeration pipeline; and an electromagnetic pulse valve is installed on the gas conveying pipeline.

[0010] In one specific implementation, the diameter of the aeration pipeline ranges from 4 cm to 8 cm.

[0011] In one specific implementation, a first regulating valve is further installed on the gas conveying pipeline, and the first regulating valve is close to the air inlet end of the gas conveying pipeline.

[0012] In one specific implementation, the post-treatment unit comprises a sedimentation tank; the sedimentation tank is communicated with a water outlet of the flocculation reaction tank, and is used for separating sludge and wastewater.

[0013] In one specific implementation, the post-treatment unit further comprises a neutralization tank; the neutralization tank is communicated with a water outlet of the sedimentation tank, and is used for adjusting the pH value of clean water in the sedimentation tank to a standard range.

[0014] In one specific implementation, the pretreatment unit comprises a first front reaction tank, a second front reaction tank and a coagulation tank which are sequentially communicated from front to back; a water outlet of the coagulation tank is communicated with a water inlet of the flocculation reaction tank; the first front reaction tank is used for adjusting the pH value of wastewater, the second front reaction tank is used for further removing part of impurities, and the coagulation tank is used for adding a coagulant to remove suspended solids and colloidal substances.

[0015] In one specific implementation, the high-density sedimentation wastewater treatment system further comprises a sludge discharge assembly; the sludge discharge assembly comprises a discharge pipeline, a sludge buffer tank and a discharge pump; one end of the discharge pipeline is communicated with the bottom of the sedimentation tank, and the other end is communicated with the sludge buffer tank; and the discharge pump is installed on the discharge pipeline.

[0016] In one specific embodiment, the high-density sedimentation wastewater treatment system further comprises a backflow assembly, the backflow assembly comprising a backflow pipeline and a backflow pump; one end of the backflow pipeline is in communication with the discharge pipeline, and the other end is in communication with the flocculation reaction tank; the backflow pump is installed on the backflow pipeline.

[0017] In one specific embodiment, the high-density sedimentation wastewater treatment system further comprises a flushing assembly, the flushing assembly being a main flushing pipeline; the main flushing pipeline is provided with flushing branch pipes respectively branched to the backflow pipeline and the discharge pipeline, and each of the flushing branch pipes is provided with a second regulating valve.

[0018] In summary, the high-density sedimentation wastewater treatment system has the following beneficial technical effects:

[0019] 1. The high-density sedimentation wastewater treatment system is provided with an aeration assembly, and the bubbles generated by aeration of the aeration assembly will drive the surrounding sludge flocs to rise together when the bubbles rise in the water, thereby preventing the sludge flocs from depositing at the edge of the flow guide opening. At the same time, the continuous disturbance of the airflow enables the sludge flocs to maintain a uniformly dispersed state in the flocculation reaction tank, thereby facilitating the sludge flocs to pass through the flow guide opening with the water flow, further reducing the risk of blockage of the flow guide opening, and avoiding the problems of overflow and secondary pollution of the flocculation reaction tank caused by blockage of the flow guide opening.

[0020] 2. The high-density sedimentation wastewater treatment system is provided with a sludge discharge assembly, which facilitates the operation personnel to timely discharge the sludge deposited at the bottom of the sedimentation tank to the sludge buffer tank, thereby reducing the residence time of the sludge in the sedimentation tank, preventing the sludge from deteriorating and producing odor, and avoiding secondary pollution to the environment. The backflow assembly is provided, and part of the sludge is backflowed to the flocculation reaction tank. The microorganisms and enzyme substances in the backflowed sludge are helpful for further degradation of organic matter in the wastewater, thereby improving the wastewater treatment effect. The sludge discharge assembly and the backflow assembly cooperate with each other, and the recycling of the sludge realizes the maximized utilization of resources and improves the wastewater treatment effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the high-density sedimentation wastewater treatment system.

[0022] Mark 1, pretreatment unit; 11, first front reaction tank; 12, second front reaction tank; 13, coagulation tank; 2, flocculation reaction tank; 3, post-treatment unit; 31, sedimentation tank; 32, neutralization tank; 4, aeration assembly; 41, aeration pipeline; 42, gas conveying pipeline; 43, electromagnetic pulse valve; 44, first regulating valve; 5, sludge discharge assembly; 51, discharge pipeline; 52, discharge pump; 6, backflow assembly; 61, backflow pipeline; 62, backflow pump; 7, flushing assembly; 71, main flushing pipeline; 72, flushing branch pipe. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be further explained and described in connection with the drawings and embodiments, but the utility model is not limited to the following described embodiments.

[0024] In the daily operation process of the high-density sedimentation wastewater treatment system, most of the sludge flocs will pass through the guide opening of the flocculation reaction tank 2 with the water flow, and a small part of the sludge flocs will deposit on the edge of the guide opening. Over a long period of time, the deposited sludge flocs will gradually block the guide opening, eventually leading to overflow of the flocculation reaction tank 2 and secondary pollution to the surrounding environment. The utility model aims to provide a high-density sedimentation wastewater treatment system. The aeration assembly 4 generates bubbles through aeration, and the bubbles will drive the surrounding sludge flocs to rise when rising in the water, thereby preventing the sludge flocs from depositing on the edge of the guide opening. At the same time, the continuous disturbance of the airflow causes the sludge flocs to maintain a uniformly dispersed state in the flocculation reaction tank 2, facilitating the sludge flocs to pass through the guide opening with the water flow, and thereby avoiding the blockage of the guide opening.

[0025] Embodiment 1

[0026] With reference to Figure 1 A high-density sedimentation wastewater treatment system comprises a pretreatment unit 1, a flocculation reaction tank 2, and an aeration assembly 4. The pretreatment unit 1 is used to remove part of the impurities in inorganic wastewater. The flocculation reaction tank 2 is in communication with the effluent outlet of the pretreatment unit 1 and is used to promote the formation of sludge flocs from suspended matter and colloidal substances in wastewater. The post-treatment unit 3 is in communication with the effluent outlet of the flocculation reaction tank 2 through a guide opening and is used to further separate sludge and wastewater. The aeration assembly 4 is arranged in the flocculation reaction tank 2 at a position close to the guide opening and is used to provide airflow into the flocculation reaction tank 2 to continuously disturb the sludge flocs, so that the sludge flocs maintain a uniformly dispersed state in the flocculation reaction tank 2.

[0027] With reference to Figure 1 The aeration assembly 4 comprises an aeration pipeline 41 and a gas conveying pipeline 42. The aeration pipeline 41 is arranged in the flocculation reaction tank 2. The gas conveying pipeline 42 is in communication with the gas inlet end of the aeration pipeline 41 and is used to convey gas into the aeration pipeline 41. An electromagnetic pulse valve 43 is installed on the gas conveying pipeline 42. The diameter of the aeration pipeline 41 ranges from 4 cm to 8 cm.

[0028] Specifically, the diameter of the aeration pipeline 41 can be 4 cm, 6 cm, or 8 cm. By arranging the aeration pipeline 41 with an appropriate diameter, uniform distribution of bubbles is achieved, thereby effectively driving the sludge flocs to rise and preventing the deposition of sludge flocs. Such arrangement modes are all acceptable. Preferably, the diameter of the aeration pipeline 41 is 6 cm.

[0029] With reference to Figure 1The pretreatment unit 1 includes a first pre-reaction tank 11, a second pre-reaction tank 12, and a coagulation tank 13 connected sequentially from front to back. The outlet of the coagulation tank 13 is connected to the inlet of the flocculation reaction tank 2. The first pre-reaction tank 11 is used to adjust the pH value of the wastewater. The second pre-reaction tank 12 is used to further remove some impurities. A coagulant is added to the coagulation tank 13 to initially form sludge flocs to remove suspended solids and colloidal substances in the wastewater. Subsequently, a coagulant aid is added to the flocculation reaction tank 2 to further promote the formation of sludge flocs and improve the wastewater treatment effect.

[0030] Reference Figure 1 The post-treatment unit 3 includes a sedimentation tank 31. The sedimentation tank 31 is connected to the outlet of the flocculation reaction tank 2 and is used to separate sludge and wastewater.

[0031] Example 2:

[0032] Reference Figure 1 In this embodiment of the high-density sedimentation wastewater treatment system, based on embodiment 1, a first regulating valve 44 is also installed on the gas conveying pipeline 42, and the first regulating valve 44 is close to the gas inlet end of the gas conveying pipeline 42.

[0033] In this embodiment, the first regulating valve 44 is configured to cooperate with the electromagnetic pulse valve 43, so that the operator can adjust the flow and flow rate of gas in the aeration pipe 41 according to the amount of sludge flocs in the flocculation reaction tank 2. This ensures that when the aeration component 4 overflows from the bottom, the bubbles can drive the sludge flocs that are about to settle with the most appropriate intensity, thus preventing the sludge flocs from settling while avoiding excessive disturbance of the sludge flocs by the airflow.

[0034] Example 3:

[0035] Reference Figure 1 In this embodiment of the high-density sedimentation wastewater treatment system, based on embodiment 1, the post-treatment unit 3 further includes a neutralization tank 32; the neutralization tank 32 is connected to the outlet of the sedimentation tank 31 and is used to adjust the pH value of the clear water in the sedimentation tank 31 to meet the standard range.

[0036] In this embodiment, the neutralization tank 32 is provided to facilitate the adjustment of the pH value of the clear water in the sedimentation tank 31, ensuring that the water quality of the effluent from the high-density sedimentation wastewater treatment system meets the standards.

[0037] Example 4:

[0038] Reference Figure 1The high-density sedimentation wastewater treatment system of the embodiment, on the basis of the embodiment 1, further comprises a sludge discharge assembly 5, the sludge discharge assembly 5 comprising a discharge pipeline 51, a sludge buffer tank and a discharge pump 52; the discharge pipeline 51 is in communication with the bottom of the sedimentation tank 31 at one end and in communication with the sludge buffer tank at the other end; the discharge pump 52 is installed on the discharge pipeline 51.

[0039] In the embodiment, the sludge discharge assembly 5 is arranged to facilitate the operator to timely discharge the sludge deposited at the bottom of the sedimentation tank 31 to the sludge buffer tank, thereby reducing the residence time of the sludge in the sedimentation tank 31 and preventing the sludge from deteriorating and producing odor, so as to avoid secondary pollution to the environment.

[0040] Embodiment 5

[0041] With reference to Figure 1 The high-density sedimentation wastewater treatment system of the embodiment, on the basis of the embodiment 4, further comprises a backflow assembly 6, the backflow assembly 6 comprising a backflow pipeline 61 and a backflow pump 62; the backflow pipeline 61 is in communication with the discharge pipeline 51 at one end and in communication with the flocculation reaction tank 2 at the other end; the backflow pump 62 is installed on the backflow pipeline 61.

[0042] In the embodiment, the backflow assembly 6 is arranged to backflow part of the sludge to the flocculation reaction tank 2, and the microorganisms and enzyme substances in the backflow sludge help to further degrade the organic matter in the wastewater, thereby improving the wastewater treatment effect.

[0043] Embodiment 6

[0044] With reference to Figure 1 The high-density sedimentation wastewater treatment system of the embodiment, on the basis of the embodiment 5, further comprises a flushing assembly 7, the flushing assembly 7 being a main flushing pipeline 71; the main flushing pipeline 71 is provided with flushing branch pipes 72 respectively branched to the backflow pipeline 61 and the discharge pipeline 51, and a second adjusting valve is installed on each flushing branch pipe 72.

[0045] In the embodiment, the flushing assembly 7 is arranged to facilitate the operator to timely flush the backflow pipeline 61 and the discharge pipeline 51, thereby preventing the backflow pipeline 61 and the discharge pipeline 51 from being blocked and deposited with sludge.

[0046] The working principle of the high-density sedimentation wastewater treatment system is as follows: wastewater is firstly subjected to preliminary treatment by the pretreatment unit 1, part of impurities is removed, and sludge floc is preliminarily formed; then the wastewater flows into the flocculation reaction tank 2, is mixed with a coagulant in the flocculation reaction tank 2, and the formation of the sludge floc is further promoted; at this time, under the action of the aeration pipeline 41, the aeration pipeline 41 provides airflow into the flocculation reaction tank 2, generates air bubbles, and the air bubbles drive the surrounding sludge floc to rise together in the rising process in water, so that the sludge floc is prevented from depositing around the flow guide port; meanwhile, the continuous disturbance effect of the airflow enables the sludge to keep a uniformly dispersed state in the flocculation reaction tank 2, the sludge floc is convenient for flowing through the flow guide port of the flocculation reaction tank 2 with water flow, and flows to the sedimentation tank 31; in the sedimentation tank 31, the sludge and the wastewater are subjected to solid-liquid separation; the sludge at the bottom of the sedimentation tank 31 is discharged through the sludge discharge assembly 5, and the supernatant flows into the neutralization tank 32; in the neutralization tank 32, the pH value of the supernatant is adjusted to reach the standard range, and finally the treatment of the wastewater is completed.

[0047] The preferred embodiments of the utility model are not limited to the protection scope of the utility model, and therefore: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A high-density sedimentation wastewater treatment system, characterized in that: include, Pretreatment unit (1) is used to remove some impurities from inorganic wastewater; The flocculation reaction tank (2) is connected to the outlet of the pretreatment unit (1) and is used to promote the formation of sludge flocs from suspended solids and colloidal substances in the wastewater. The post-treatment unit (3) is connected to the outlet of the flocculation reaction tank (2) through a guide port for further separation of sludge and wastewater; And an aeration component (4) is installed in the flocculation reaction tank (2) near the flow guide, for providing airflow into the flocculation reaction tank (2).

2. The high-density sedimentation wastewater treatment system according to claim 1, characterized in that: The aeration assembly (4) includes an aeration pipe (41) and a gas delivery pipe (42); The aeration pipe (41) is installed inside the flocculation reaction tank (2); The gas delivery pipe (42) is connected to the air inlet end of the aeration pipe (41) and is used to deliver gas into the aeration pipe (41). An electromagnetic pulse valve (43) is installed on the gas delivery pipe (42).

3. The high-density sedimentation wastewater treatment system according to claim 2, characterized in that: The diameter of the aeration pipe (41) ranges from 4cm to 8cm.

4. The high-density sedimentation wastewater treatment system according to claim 2, characterized in that: A first regulating valve (44) is also installed on the gas delivery pipeline (42), and the first regulating valve (44) is close to the gas inlet end of the gas delivery pipeline (42).

5. The high-density sedimentation wastewater treatment system according to claim 1, characterized in that: The post-treatment unit (3) includes a sedimentation tank (31); The sedimentation tank (31) is connected to the outlet of the flocculation reaction tank (2) for separating sludge and wastewater.

6. The high-density sedimentation wastewater treatment system according to claim 5, characterized in that: The post-processing unit (3) also includes a neutralization tank (32); The neutralization tank (32) is connected to the outlet of the sedimentation tank (31) and is used to adjust the pH value of the clear water in the sedimentation tank (31) to meet the standard range.

7. The high-density sedimentation wastewater treatment system according to any one of claims 1-6, characterized in that: The pretreatment unit (1) includes a first pre-reaction tank (11), a second pre-reaction tank (12), and a coagulation tank (13) connected sequentially from front to back; The outlet of the coagulation tank (13) is connected to the inlet of the flocculation reaction tank (2); The first pre-reaction tank (11) is used to adjust the pH value of the wastewater, the second pre-reaction tank (12) is used to further remove some impurities, and the coagulation tank (13) is used to add coagulant to remove suspended solids and colloidal substances.

8. The high-density sedimentation wastewater treatment system according to claim 7, characterized in that: The high-density sedimentation wastewater treatment system also includes a sludge discharge component (5), which includes a discharge pipe (51), a sludge buffer tank, and a discharge pump (52). One end of the discharge pipe (51) is connected to the bottom of the sedimentation tank (31), and the other end is connected to the sludge buffer tank; The discharge pump (52) is installed on the discharge pipe (51).

9. The high-density sedimentation wastewater treatment system according to claim 8, characterized in that: The high-density sedimentation wastewater treatment system also includes a reflux assembly (6), which includes a reflux pipe (61) and a reflux pump (62); One end of the return pipe (61) is connected to the discharge pipe (51), and the other end is connected to the flocculation reaction tank; The reflux pump (62) is installed on the reflux pipe (61).

10. The high-density sedimentation wastewater treatment system according to claim 9, characterized in that: The high-density sedimentation wastewater treatment system also includes a flushing assembly (7), which is a main flushing pipe (71); The main flushing pipe (71) is provided with flushing branch pipes (72) that branch to the return pipe (61) and the discharge pipe (51) respectively, and each of the flushing branch pipes (72) is equipped with a second regulating valve.

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