Wastewater treatment system

Abstract

The utility model provides a wastewater treatment system, which comprises a coagulation flocculation sedimentation device, the coagulation flocculation sedimentation device comprises a coagulation flocculation sedimentation tank, a sludge discharge assembly and a backflow assembly, the coagulation flocculation sedimentation tank comprises a coagulation cavity, a flocculation cavity and a sedimentation cavity, the coagulation cavity is communicated with the flocculation cavity, the flocculation cavity is communicated with the sedimentation cavity, the sludge discharge assembly is communicated with the sedimentation cavity, and the backflow assembly is communicated with the sedimentation cavity. The backflow assembly is respectively communicated with the precipitation cavity and the flocculation cavity, and is used for enabling part of sludge to flow back to the flocculation cavity; the immersed ultrafiltration tank is used for carrying out immersed ultrafiltration treatment on the wastewater, and the immersed ultrafiltration tank is communicated with the precipitation cavity; the neutralization water production tank is communicated with the immersed ultrafiltration tank; the backwashing device is connected with the neutralization water production tank, and the backwashing device is used for backwashing the immersed ultrafiltration tank, the coagulation cavity, the flocculation cavity and the precipitation cavity. The filter is not easy to scale and block, has a good filtering effect, is easy to backwash, can save the use amount of chemicals such as acid and alkali, and reduces the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, and particularly relates to a wastewater treatment system. Background Art

[0002] With the development of industry, the amount of industrial wastewater generated is huge. Industrial wastewater refers to the wastewater, sewage and waste liquid generated in the process of industrial production, which contains industrial production materials, intermediate products and products lost with water, as well as pollutants generated in the production process. If these industrial wastewaters are directly discharged into the outside world, they will surely pollute the environment and affect human health. Therefore, in order to meet the environmental protection requirements, industrial wastewater must be treated before being discharged.

[0003] The current wastewater treatment systems still have various deficiencies. For example, scaling is likely to occur in many places, the filtering device in the wastewater treatment system is prone to blockage, the filtering effect is not ideal, the filtering accuracy is low, and backwashing is not easy to operate. Moreover, a variety of chemicals need to be added during the wastewater treatment process, such as acids, alkalis and other chemicals. These chemicals consume a large amount and account for a large part of the cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wastewater treatment system, which is not easy to scale and block, has a good filtering effect, is easy to operate for backwashing, can save the dosage of chemicals such as acids and alkalis at the same time, and effectively reduces the cost of wastewater treatment.

[0005] To achieve the above purpose, the utility model provides a wastewater treatment system, which includes:

[0006] A coagulation and flocculation sedimentation device, which includes a coagulation and flocculation sedimentation tank, a sludge discharge assembly and a reflux assembly. The coagulation and flocculation sedimentation tank includes a coagulation chamber, a flocculation chamber and a sedimentation chamber distributed horizontally. The sedimentation chamber is used for sedimenting sludge. The coagulation chamber and the flocculation chamber are connected, the flocculation chamber and the sedimentation chamber are connected. The sludge discharge assembly is connected to the sedimentation chamber and is used for discharging sludge from the sedimentation chamber. The reflux assembly is respectively connected to the sedimentation chamber and the flocculation chamber and is used for refluxing part of the sludge in the sedimentation chamber to the flocculation chamber;

[0007] An immersed ultrafiltration tank, which is used for performing immersed ultrafiltration treatment on wastewater, and the immersed ultrafiltration tank is connected to the sedimentation chamber;

[0008] A neutralization and production water tank, which is connected to the immersed ultrafiltration tank and is used for adjusting the pH value of the wastewater;

[0009] A backwashing device, which is connected to the neutralization and production water tank and is used for backwashing the immersed ultrafiltration tank, the coagulation chamber, the flocculation chamber and the sedimentation chamber.

[0010] Optionally, the reflux assembly includes a reflux pipe and a flow meter. One end of the reflux pipe communicates with the sedimentation chamber, the other end of the reflux pipe leads to the flocculation chamber, and the flow meter is arranged on the reflux pipe.

[0011] Optionally, the coagulation, flocculation and sedimentation device includes a central cylinder and a first stirring paddle. Both the central cylinder and the first stirring paddle are located in the flocculation chamber. The central cylinder is sleeved outside the first stirring paddle, and one end of the reflux assembly leads to the central cylinder.

[0012] Optionally, a chemical dosing ring is arranged inside the central cylinder, and the chemical dosing ring is coaxial with the central cylinder.

[0013] Optionally, the coagulation, flocculation and sedimentation device includes an inclined tube sedimentation assembly located in the sedimentation chamber. The inclined tube sedimentation assembly includes inclined tubes and a sludge scraper, and the sludge scraper is located at the bottom of the sedimentation chamber.

[0014] Optionally, the sedimentation chamber of the coagulation, flocculation and sedimentation tank is communicated with the submerged ultrafiltration tank through a first pipeline. The neutralization and water production tank is communicated with the submerged ultrafiltration tank through a second pipeline. A first pump is arranged on the second pipeline. The coagulation chamber and the flocculation chamber are communicated through a third pipeline, and the flocculation chamber and the sedimentation chamber are communicated through a fourth pipeline.

[0015] Optionally, the backwashing device includes a backwashing pump and a backwashing pipeline. The backwashing pump is arranged on the backwashing pipeline. The neutralization and water production tank, the submerged ultrafiltration tank, the coagulation chamber, the flocculation chamber and the sedimentation chamber are all connected to the backwashing pipeline. The backwashing pipeline is used to transport the liquid in the neutralization and water production tank to the submerged ultrafiltration tank, and then transport the liquid in the submerged ultrafiltration tank to the coagulation chamber, the flocculation chamber and the sedimentation chamber.

[0016] Optionally, the sludge discharge assembly includes a sludge discharge pipe and a second pump. The second pump is arranged on the sludge discharge pipe, and the sludge discharge pipe is communicated with the sedimentation chamber.

[0017] Optionally, the wastewater treatment system includes an aeration device. The coagulation chamber, the submerged ultrafiltration tank and the neutralization and water production tank are all connected to the aeration device.

[0018] Optionally, the aeration device includes a first aeration pipe, a second aeration pipe, a third aeration pipe and a blower. The first aeration pipe, the second aeration pipe and the third aeration pipe are all connected to the blower. The first aeration pipe extends into the coagulation chamber, the second aeration pipe extends into the submerged ultrafiltration tank, and the third aeration pipe extends into the neutralization and water production tank.

[0019] With the above configuration, the utility model adopts an immersed ultrafiltration tank to perform immersed ultrafiltration treatment on wastewater, with good filtration effect and high filtration accuracy. The utility model returns part of the sludge in the sedimentation chamber to the flocculation chamber through a reflux assembly. This part of the refluxed sludge can promote the flocculation reaction, increase the concentration of physical and chemical sludge, and adjust the flow rate of wastewater. Compared with the amount of alkali required in the prior art, the recycling of part of the sludge reduces the consumption of alkali in the coagulation, flocculation and sedimentation device, saving costs. The backwashing device of the utility model can recycle the liquid in the neutralization and production water tank to wash the immersed ultrafiltration tank, and then use the liquid after washing the immersed ultrafiltration tank to wash the coagulation chamber, flocculation chamber and sedimentation chamber, thereby reducing the addition amount of acid in backwashing and effectively reducing costs. The device in the utility model is not easy to scale and block, has a good filtration effect, is easy to operate in backwashing, and the utility model can also save the dosage of chemicals such as acid and alkali, effectively reducing the cost of wastewater treatment, and has the advantages of high-end, intelligent, green and efficient. Description of the Drawings

[0020] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the utility model, and do not constitute any limitation to the scope of the utility model. Among them:

[0021] Figure 1 It is a schematic diagram of a wastewater treatment system according to an embodiment of the utility model.

[0022] Among them, the reference numerals are as follows:

[0023] 1 - Coagulation, flocculation and sedimentation tank; 11 - Coagulation chamber; 12 - Flocculation chamber; 121 - Central cylinder; 122 - First stirring paddle; 123 - Chemical dosing ring; 124 - Second stirring paddle; 125 - Third pH meter; 13 - Sedimentation chamber; 131 - Inclined tube; 132 - Scraper; 133 - Effluent weir; 21 - Sludge discharge pipe; 22 - Second pump; 31 - Ultrafiltration membrane; 32 - First discharge pipe; 33 - Fourth pH meter; 34 - First liquid level meter; 4 - Neutralization and production water tank; 41 - Second discharge pipe; 42 - Second pH meter; 43 - Second liquid level meter; 51 - First pipeline; 52 - Second pipeline; 521 - First pump; 61 - Backwashing pump; 62 - Backwashing pipeline; 621 - Second pipeline mixer; 71 - First aeration pipe; 72 - Second aeration pipe; 73 - Third aeration pipe; 74 - Blower; 81 - Return pipe; 82 - Flowmeter. Detailed Embodiments

[0024] In this text, unless otherwise specified, terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", etc. are used to indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and operation, so it should not be construed as a limitation to the present utility model.

[0025] The specific embodiments of the present utility model will be described in more detail below with reference to the schematic diagrams. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present utility model.

[0026] Figure 1 It is a schematic diagram of a wastewater treatment system according to an embodiment of the present utility model. Please refer to Figure 1 The embodiment of the present utility model provides a wastewater treatment system, which includes a coagulation and flocculation sedimentation device, a submerged ultrafiltration tank 3, a neutralization and product water tank 4, and a backwashing device. The submerged ultrafiltration tank 3 is located downstream of the coagulation and flocculation sedimentation device, and the neutralization and product water tank 4 is located downstream of the submerged ultrafiltration tank 3.

[0027] The coagulation and flocculation sedimentation device includes a coagulation and flocculation sedimentation tank 1, a sludge discharge assembly, and a reflux assembly. The coagulation and flocculation sedimentation tank 1 includes a coagulation chamber 11, a flocculation chamber 12, and a sedimentation chamber 13 that are horizontally distributed. The sedimentation chamber 13 is used for sedimenting sludge. The coagulation chamber 11 and the flocculation chamber 12 are connected, and the flocculation chamber 12 and the sedimentation chamber 13 are connected. The sludge discharge assembly is connected to the sedimentation chamber 13 and is used to discharge the sludge from the sedimentation chamber 13. Further, the sludge discharge assembly includes a sludge discharge pipe 21 and a second pump 22. The second pump 22 is arranged on the sludge discharge pipe 21, and the sludge discharge pipe 21 is connected to the sedimentation chamber 13 for discharging the sludge from the sedimentation chamber 13, such as discharging it to a sludge thickening tank.

[0028] The reflux assembly is respectively communicated with the sedimentation chamber 13 and the flocculation chamber 12. The reflux assembly is used to reflux part of the sludge in the sedimentation chamber 13 to the flocculation chamber 12. It can be understood that refluxing part of the sludge to the flocculation chamber 12 can enhance the flocculation sedimentation effect. Exemplarily, the reflux assembly includes a reflux pipe 81 and a flow meter 82. The flow meter 82 is arranged on the reflux pipe 81 and is used to detect the flow rate of the reflux sludge. One end of the reflux pipe 81 is communicated with the sedimentation chamber 13. Specifically, one end of the reflux pipe 81 is communicated with the sedimentation chamber 13 through a sludge discharge assembly. The power of the reflux sludge can be provided by the second pump 22. The other end of the reflux pipe 81 leads to the flocculation chamber 12. Further, the coagulation and flocculation sedimentation device includes a central cylinder 121 and a first stirring paddle 122. Both the central cylinder 121 and the first stirring paddle 122 are located in the flocculation chamber 12. The central cylinder 121 is sleeved outside the first stirring paddle 122. One end of the reflux assembly leads to the central cylinder 121, that is, the other end of the reflux pipe 81 leads to the central cylinder 121. The central cylinder 121 can make the water flow form a vertical flow inside the central cylinder, reduce the flow rate inside the central cylinder, increase the contact time of various substances in the wastewater, and cause sufficient flocculation reaction, thereby promoting and increasing the sedimentation of suspended substances and sludge and reducing the dosage of chemicals. The setting of the first stirring paddle 122 helps the rapid dissolution of chemicals, thereby promoting the flocculation reaction. In some other embodiments, the central cylinder 121 and the first stirring paddle 122 can also be used alone. It can be understood that leading the other end of the reflux pipe 81 to the central cylinder 121 is beneficial to prolong the residence time of the reflux sludge in the flocculation chamber 12, improve the mixing effect of the reflux sludge and the wastewater, and enhance the flocculation effect. It can be understood that the flow rate inside the central cylinder is low and the flow rate outside the central cylinder is fast. The central cylinder plays an effect of adjusting the flow rate. In actual production, according to the actual incoming water situation, sometimes the other end of the reflux pipe 81 can also be led outside the central cylinder 121. Preferably, a chemical dosing ring 123 is arranged inside the central cylinder 121, and the chemical dosing ring 123 is coaxial with the central cylinder 121. The setting of the chemical dosing ring 123 enables the chemicals to be added into the flocculation chamber 12 more evenly, which is beneficial to the uniform and sufficient mixing of the chemicals and the wastewater. A third pH meter 125 is also arranged on the flocculation chamber 12 and is used to monitor the pH value of the flocculation chamber 12.

[0029] Further, the coagulation and flocculation sedimentation device includes an inclined tube sedimentation assembly located in the sedimentation chamber 13. The inclined tube sedimentation assembly includes inclined tubes 131 and a sludge scraper 132. The sludge scraper 132 is located at the bottom of the sedimentation chamber 13. It can be understood that the number of the inclined tubes 131 is multiple. The inclined tubes 131 are pipes inclined at a certain angle relative to the horizontal direction. Multiple inclined tubes 131 are arranged side by side in the sedimentation chamber 13. Specifically, the inclined tubes 131 are arranged in the upper part of the sedimentation chamber 13 and above the sludge scraper 132.

[0030] The submerged ultrafiltration tank 3 is used for submerged ultrafiltration treatment of wastewater, and the submerged ultrafiltration tank 3 is communicated with the sedimentation chamber 13. A fourth pH meter 33, a first liquid level meter 34 and an ultrafiltration membrane 31 are arranged in the submerged ultrafiltration tank 3. The ultrafiltration membrane 31 can be made of ceramic or PTFE, and the advantage is that it can withstand long-term immersion in acid and alkali. Preferably, two cavities are arranged in the submerged ultrafiltration tank 3, and the ultrafiltration membrane 31 is arranged in both cavities, so as to achieve the effect of one in use and one in reserve. It can be understood that the submerged ultrafiltration tank 3 needs to be cleaned after being used for a period of time, otherwise the ultrafiltration membrane 31 will be seriously blocked and affect the filtration work. The one in use and one in reserve can facilitate the cleaning and inspection, maintenance and replacement of the ultrafiltration membrane 31. The cleaning agent for the ultrafiltration membrane 31 is adjusted according to the membrane material and the pollutants in the wastewater. For example, hydrochloric acid, citric acid or EDTA (ethylenediaminetetraacetic acid) can be used to clean the submerged ultrafiltration tank 3. Citric acid can be added to the submerged ultrafiltration tank 3 through the second pipeline mixer 621.

[0031] Exemplarily, the sedimentation chamber 13 of the coagulation and flocculation sedimentation tank 1 is communicated with the submerged ultrafiltration tank 3 through the first pipeline 51. The coagulation chamber 11 and the flocculation chamber 12 are communicated through the third pipeline. For example, the coagulation chamber 11 and the flocculation chamber 12 are separated by a partition 14, the third pipeline penetrates through the partition 14, and the flocculation chamber 12 and the sedimentation chamber 13 are communicated through the fourth pipeline.

[0032] An effluent weir 133 is further arranged at the upper part of the sedimentation chamber 13 for effluent. The effluent weir 133 is arranged above the inclined tube 131. For example, the effluent weir 133 in this embodiment can be a triangular weir, a trapezoidal weir or other shapes. It can be understood that the connection part of the first pipeline 51 and the sedimentation chamber 13 is higher than the lowest end of the effluent weir 133, so as to discharge the wastewater from the sedimentation chamber 13 to the submerged ultrafiltration tank 3.

[0033] The neutralization and production water tank 4 is communicated with the submerged ultrafiltration tank 3. The neutralization and production water tank 4 is used for adjusting the pH value of the wastewater. A second pH meter 42 and a second liquid level meter 43 are arranged on the neutralization and production water tank 4. Exemplarily, the neutralization and production water tank 4 is communicated with the submerged ultrafiltration tank 3 through the second pipeline 52. A first pump 521 is arranged on the second pipeline 52. The first pump 521 is used to pump the liquid in the submerged ultrafiltration tank 3 into the neutralization and production water tank 4.

[0034] The backwashing device is connected to the neutralization and production water tank 4. The backwashing device is used for backwashing the submerged ultrafiltration tank 3, the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13.

[0035] Furthermore, the backwash device includes a backwash pump 61 and a backwash pipeline 62. The backwash pump 61 is arranged on the backwash pipeline 62. The neutralization water production tank 4, the submerged ultrafiltration tank 3, the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13 are all connected to the backwash pipeline 62. The backwash pipeline 62 is used to transport the liquid in the neutralization water production tank 4 to the submerged ultrafiltration tank 3, and then transport the liquid in the submerged ultrafiltration tank 3 to the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13, that is, the submerged ultrafiltration tank 3 is first flushed with the liquid in the neutralization water production tank 4, and then the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13 are flushed with the liquid after flushing the submerged ultrafiltration tank 3. It is understandable that, since the flushing of the submerged ultrafiltration tank 3 requires the addition of acid, such as hydrochloric acid, citric acid or EDTA, the liquid (i.e., pickling wastewater) after flushing the submerged ultrafiltration tank 3 also contains acid, and can continue to be used to flush the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13, achieving the effect of adding acid once and benefiting two places, greatly reducing the consumption of reagents. Furthermore, a part of the liquid after flushing the submerged ultrafiltration tank 3 continues to flush the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13 through the backwash pipeline 62, and the other part is discharged to the ditch through the first discharge pipe 32. Flushing the coagulation chamber 11, the flocculation chamber 12 and the sedimentation chamber 13 reduces the scaling of the coagulation, flocculation and sedimentation device, such as the scaling of the coagulation, flocculation and sedimentation tank 1, the scaling of various pipes in the coagulation, flocculation and sedimentation device, and the scaling of various pumps, reduces the frequency of pump inspection and maintenance, reduces the amount of reagents added, and achieves the purpose of reusing the pickling wastewater.

[0036] Preferably, the wastewater treatment system also includes an aeration device, and the coagulation chamber 11, the submerged ultrafiltration tank 3 and the neutralization water production tank 4 are all connected to the aeration device. The aeration device includes a first aeration pipe 71, a second aeration pipe 72, a third aeration pipe 73 and a fan 74. The first aeration pipe 71, the second aeration pipe 72 and the third aeration pipe 73 are all connected to the fan 74. The first aeration pipe 71 extends into the coagulation chamber 11, the second aeration pipe 72 extends into the submerged ultrafiltration tank 3, and the third aeration pipe 73 extends into the neutralization water production tank 4. The aeration device can reduce the risk of scaling at the bottom of the coagulation chamber 11, the bottom of the submerged ultrafiltration tank 3 and the bottom of the neutralization water production tank 4. The aeration device can also increase the residence time of wastewater in the coagulation chamber 11 and enhance the mixing effect of wastewater and reagents in the coagulation chamber 11, and prevent the third pipeline from being blocked due to precipitation at the bottom of the coagulation chamber 11. At the same time, the aeration device can also supply oxygen to the wastewater to reduce the COD value of the wastewater.

[0037] Exemplarily, the steps of using the utility model to treat wastewater include step S1, step S2, step S3, step S4 and step S5, as follows:

[0038] Step S1, according to the main components of the wastewater, determine the ions to be removed, the types of additives and the order of addition. Taking the wastewater discharged from a steel industry as an example, the substances to be treated are mainly Ca2+ , Mg 2+ , and SiO 2 , so the "double-alkali softening method" process of caustic soda - soda ash is adopted. By adding caustic soda (NaOH), the temporary hardness in the wastewater is removed, and at the same time, Mg 2+ ions in the water are removed. By adding soda ash (sodium carbonate), the permanent hardness in the water is removed.

[0039] Specifically, NaOH and sodium carbonate are added to the coagulation chamber 11. Among them, NaOH is added to the coagulation chamber 11 through the first pipeline mixer 111, and sodium carbonate can be directly added. A first pH meter 113 is provided on the coagulation chamber 11 to measure the pH value of the liquid in the coagulation chamber 11. The purpose of using the first pipeline mixer 111 is to mix NaOH with the wastewater in advance to avoid the local concentration of NaOH being too high and affecting the reading of the first pH meter 113. Preferably, PFS (polyferric sulfate) can also be added to the coagulation chamber 11.

[0040] Preferably, the coagulation and flocculation sedimentation device further includes a second stirring paddle 124. The second stirring paddle 124 is arranged in the coagulation chamber 11 to make the medicament and the wastewater mix evenly. The first stirring paddle 122, the second stirring paddle 124 and the sludge scraper 132 in this embodiment are all controlled by frequency conversion, and the rotation speed can be adjusted according to the viscosity of the wastewater and the sludge.

[0041] Step S2, the wastewater mixed with the medicament flows into the sedimentation chamber 13 through the fourth pipeline. The inclined tube sedimentation assembly in the sedimentation chamber 13 makes the sludge or suspended matter precipitate to the bottom of the sedimentation chamber 13, and the sludge scraper 132 plays an auxiliary role in sludge discharge.

[0042] Step S3, the wastewater in the upper part of the sedimentation chamber 13 enters the first pipeline 51 through the weir and then enters the submerged ultrafiltration tank 3; a part of the sludge precipitated at the bottom of the sedimentation chamber 13 is discharged from the sedimentation chamber 13 through the sludge discharge pipe 21, and another part of the sludge is transported to the flocculation chamber 12 through the reflux pipe 81. PAM (polyacrylamide flocculant) can also be added to the flocculation chamber 12 to promote the flocculation reaction, and PAM can be added through the medicament dosing ring 123. The sludge reflux ratio can be adjusted according to the calcium and magnesium ion concentration in the coagulation chamber 11 combined with the flowmeter 82, and its precipitation concentration can be controlled by the pH value to reduce the dosage of medicaments such as alkali.

[0043] Step S4, the wastewater enters the submerged ultrafiltration tank 3 after passing through the coagulation and flocculation sedimentation tank 1. The submerged ultrafiltration tank 3 plays a role in filtration and can remove impurities such as calcium and magnesium that are prone to scale formation.

[0044] Step S5: After the wastewater passes through the submerged ultrafiltration tank 3, it enters the neutralization water production tank 4. Acid can be added to the neutralization water production tank 4 to adjust the pH value of the neutralization water production tank 4. A part of the produced water in the neutralization water production tank 4 is transported through the second discharge pipe 41 to the membrane concentration or evaporation crystallization or ion exchange system, and a part of the produced water is recycled. Recycling means using it for backwashing. That is, first, this part of the produced water is transported to the submerged ultrafiltration tank 3 for flushing, and then the liquid in the submerged ultrafiltration tank 3 is transported to the coagulation chamber 11, the flocculation chamber 12, and the sedimentation chamber 13 for flushing.

[0045] With the above configuration, the present utility model uses the submerged ultrafiltration tank 3 to perform submerged ultrafiltration treatment on the wastewater, with good filtration effect and high filtration accuracy. The present utility model returns a part of the sludge in the sedimentation chamber 13 to the flocculation chamber 12 through the reflux assembly. This part of the refluxed sludge can promote the flocculation reaction, increase the concentration of physical and chemical sludge, and adjust the flow rate of the wastewater. Compared with the amount of alkali required in the prior art, the recycling of part of the sludge reduces the consumption of alkali in the coagulation, flocculation, and sedimentation device, saving costs. The backwashing device of the present utility model can recycle the liquid in the neutralization water production tank 4 to flush the submerged ultrafiltration tank 3, and then use the liquid after flushing the submerged ultrafiltration tank 3 to flush the coagulation chamber 11, the flocculation chamber 12, and the sedimentation chamber 13, thereby reducing the amount of acid added during backwashing and effectively reducing costs. The device in the present utility model is not easy to scale and clog, has a good filtration effect, is easy to operate during backwashing, and the present utility model can also save the dosage of chemicals such as acid and alkali, effectively reducing the cost of wastewater treatment, and has the advantages of high-end, intelligent, green, and efficient.

[0046] The coagulation chamber 11 and the flocculation chamber 12 are each connected to the sedimentation chamber 13 through a drain pipe 112. The drain pipe 112 is located below the third pipe and the fourth pipe. The drain pipe 112 usually remains closed and is only opened when the coagulation, flocculation, and sedimentation tank 1 is overhauled. The overhaul frequency is relatively low, generally once every two or three years. The drain pipe 112 is used for sludge drainage and emptying, that is, the sludge in the coagulation chamber 11 and the flocculation chamber 12 is first discharged into the sedimentation chamber 13, and then the sedimentation chamber 13 empties the sludge.

[0047] It should be noted that the references to "an embodiment", "embodiment", "specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiments may include specific features, structures, or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure, or characteristic is described in combination with an embodiment, whether explicitly described or not, implementing such a feature, structure, or characteristic in combination with other embodiments is within the knowledge scope of those skilled in the relevant art.

[0048] It should be noted that the embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method section.

[0049] It should also be noted that although the present utility model has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present utility model. For any person skilled in the art, without departing from the scope of the technical solution of the present utility model, many possible changes and modifications can be made to the technical solution of the present utility model by using the technical content disclosed above, or it can be modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still belong to the scope protected by the technical solution of the present utility model.

[0050] It should also be understood that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than to represent the logical relationship or sequential relationship, etc. between each component, element, step.

[0051] In addition, it should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the present utility model. It must be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates the contrary. For example, the reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. Also, the word "or" should be understood to have the definition of logical "or", rather than the definition of logical "exclusive or", unless the context clearly indicates the contrary. In addition, the implementation of the method and / or device in the embodiments of the present utility model may include performing the selected tasks manually, automatically, or in combination.

Claims

1. A wastewater treatment system, characterized in that: include: A coagulation and flocculation sedimentation device, comprising a coagulation and flocculation sedimentation tank, a sludge discharge component and a reflux component, wherein the coagulation and flocculation sedimentation tank comprises a coagulation chamber, a flocculation chamber and a sedimentation chamber distributed horizontally and upwardly, wherein the sedimentation chamber is used to precipitate sludge, wherein the coagulation chamber is connected to the flocculation chamber, wherein the flocculation chamber is connected to the sedimentation chamber, wherein the sludge discharge component is connected to the sedimentation chamber, wherein the sludge discharge component is used to discharge sludge from the sedimentation chamber, wherein the reflux component is connected to the sedimentation chamber and the flocculation chamber respectively, wherein the reflux component is used to return part of the sludge in the sedimentation chamber to the flocculation chamber; An immersed ultrafiltration tank, which is used to perform immersed ultrafiltration treatment on wastewater, and the immersed ultrafiltration tank is connected to the sedimentation chamber; A neutralization water production pool, the neutralization water production pool is connected to the submerged ultrafiltration pool, and the neutralization water production pool is used to adjust the pH value of the wastewater; A backwashing device is connected to the neutralization water production tank, and is used to backwash the submerged ultrafiltration tank, the coagulation chamber, the flocculation chamber and the sedimentation chamber.

2. The wastewater treatment system according to claim 1, characterized in that: The reflux assembly comprises a reflux pipe and a flow meter. One end of the reflux pipe is communicated with the sedimentation chamber, and the other end of the reflux pipe leads to the flocculation chamber. The flow meter is arranged on the reflux pipe.

3. The wastewater treatment system according to claim 1, characterized in that: The coagulation flocculation sedimentation device comprises a central tube and a first stirring paddle, wherein the central tube and the first stirring paddle are both located in the flocculation chamber, the central tube is hollowly sleeved outside the first stirring paddle, and one end of the reflux assembly leads to the central tube.

4. The wastewater treatment system according to claim 3, characterized in that: A medicine adding ring is arranged in the central tube, and the medicine adding ring is coaxial with the central tube.

5. The wastewater treatment system according to claim 1, characterized in that: The coagulation and flocculation sedimentation device comprises an inclined tube sedimentation assembly located in the sedimentation chamber. The inclined tube sedimentation assembly comprises an inclined tube and a scraper. The scraper is located at the bottom of the sedimentation chamber.

6. The wastewater treatment system according to claim 1, characterized in that: The sedimentation chamber of the coagulation and flocculation sedimentation tank is connected with the submerged ultrafiltration tank through a first pipe, the neutralization water production tank is connected with the submerged ultrafiltration tank through a second pipe, a first pump is provided on the second pipe, the coagulation chamber and the flocculation chamber are connected with each other through a third pipe, and the flocculation chamber and the sedimentation chamber are connected with each other through a fourth pipe.

7. The wastewater treatment system according to claim 1, characterized in that: The backwash device includes a backwash pump and a backwash pipeline. The backwash pump is arranged on the backwash pipeline. The neutralization water production tank, the immersed ultrafiltration tank, the coagulation chamber, the flocculation chamber and the sedimentation chamber are all connected to the backwash pipeline. The backwash pipeline is used to transport the liquid in the neutralization water production tank to the immersed ultrafiltration tank, and then transport the liquid in the immersed ultrafiltration tank to the coagulation chamber, the flocculation chamber and the sedimentation chamber.

8. The wastewater treatment system according to claim 1, characterized in that: The mud discharge assembly includes a mud discharge pipe and a second pump, wherein the second pump is arranged on the mud discharge pipe, and the mud discharge pipe is communicated with the sedimentation chamber.

9. The wastewater treatment system according to claim 1, characterized in that: The wastewater treatment system comprises an aeration device, and the coagulation chamber, the submerged ultrafiltration tank and the neutralization water production tank are all connected to the aeration device.

10. The wastewater treatment system according to claim 9, characterized in that: The aeration device includes a first aeration tube, a second aeration tube, a third aeration tube and a fan. The first aeration tube, the second aeration tube and the third aeration tube are all connected to the fan. The first aeration tube extends into the coagulation chamber, the second aeration tube extends into the submerged ultrafiltration tank, and the third aeration tube extends into the neutralization water production tank.

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