A sewage treatment apparatus and method

Abstract

The application discloses a sewage treatment device and method, and belongs to the technical field of sewage treatment. The sewage treatment device comprises a gas float filter tank used for connecting first sewage and dissolved air water, and the impurities in the first sewage are adsorbed by the micro-bubbles in the dissolved air water to separate the impurities. The gas float filter tank comprises a first shell wall, and the first shell wall is used for forming a first cavity. The first shell wall is provided with a first inlet, a second inlet and a first outlet. The gas float filter tank further comprises a second shell wall, and the second shell wall is arranged in the first cavity. The second shell wall is used for forming a first sub-cavity. The second shell wall and the first shell wall are used for forming a second sub-cavity. The second shell wall is provided with a third inlet, a fourth inlet and a second outlet. The third inlet is connected with the first sub-cavity and the second sub-cavity. The fourth inlet is connected with the dissolved air water. The content difference of the micro-bubbles in the first sub-cavity and the second sub-cavity is reduced, that is, the content difference of the micro-bubbles at the edge and the middle of the first cavity is reduced, and the removal effect of the impurities in the first sub-cavity is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and method. BACKGROUND

[0002] At present, most of the transportation tools such as ships are equipped with diesel or gasoline engines as power sources for operation; however, since the diesel or gasoline engines will emit exhaust gas containing harmful substances such as oil molecules and soot during operation, these harmful substances will cause damage to the ecological system, resulting in a decrease in the self-cleaning ability of the ecological system and a more fragile ecological system. SUMMARY

[0003] The purpose of the present application is to provide a sewage treatment device and method, which aims to solve the technical problem of damage to the ecological environment caused by harmful substances such as oil molecules and soot in the exhaust gas of diesel or gasoline generators in the prior art.

[0004] Technical solution: In a first aspect, the embodiments of the present application provide a sewage treatment device, comprising a gas float filter tank, wherein the gas float filter tank comprises:

[0005] a first shell wall, which forms a first cavity, and has a first inlet, a second inlet and a first outlet;

[0006] a second shell wall, which is located in the first cavity, forms a first sub-cavity, and forms a second sub-cavity together with the first shell wall, and has a third inlet, a fourth inlet and a second outlet, wherein the third inlet communicates the first sub-cavity and the second sub-cavity, and the second outlet communicates with the first outlet;

[0007] wherein the first inlet is configured to input first sewage, the second inlet and the fourth inlet are both configured to input dissolved air water, the third inlet is configured to input first clean water, the second outlet is configured to output second clean water, and the second clean water is discharged through the first outlet, the first clean water is obtained based on the dissolved air water and the first sewage, and the second clean water is obtained based on the dissolved air water and the first clean water.

[0008] In some embodiments, further comprising:

[0009] a filter, which is located in the first sub-cavity, and is configured to perform filtering treatment on third clean water to generate the second clean water, wherein the third clean water is clean water obtained by treating the first clean water with the dissolved air water.

[0010] In some embodiments, the first shell wall further has a third outlet configured to output floating impurities in the first sewage and first clean water, and a fourth outlet configured to output first precipitated impurities in the first sewage and first clean water.

[0011] In some embodiments, the floating direction of the micro-bubbles in the dissolved air water is a first direction, and along the first direction: the first inlet is located on one side of the second inlet away from the fourth outlet, the fourth inlet is located on one side of the second inlet close to the fourth outlet, and the third outlet and the fourth outlet are respectively located at two ends of the second shell wall.

[0012] In some embodiments, the sewage treatment device further comprises a buffer tank, the buffer tank comprising a third shell wall, the third shell wall enclosing a second chamber;

[0013] The second chamber and the first chamber are respectively communicated through the third outlet and the fourth outlet, and the buffer tank is configured to receive the floating impurities and the first precipitated impurities and store them in the second chamber.

[0014] In some embodiments, the third shell wall has a fifth inlet and a sixth inlet, and along the first direction, the fifth inlet and the sixth inlet are located at two ends of the third shell wall.

[0015] In some embodiments, the third shell wall further has:

[0016] a fifth outlet, along the first direction, the fifth outlet is located between the fifth inlet and the sixth inlet, and the fifth outlet is configured to output second sewage, the second sewage being sewage generated after the floating impurities and the first precipitated impurities are subjected to sedimentation stratification;

[0017] a sixth outlet, along the first direction, the sixth outlet is located on one side of the sixth inlet away from the fifth outlet, and the sixth outlet is configured to output second precipitated impurities, the second precipitated impurities being precipitates generated after the floating impurities and the first precipitated impurities are subjected to sedimentation stratification.

[0018] In some embodiments, the sewage treatment device further comprises:

[0019] an oil content meter, the oil content meter being connected to the first outlet, and the oil content meter being configured to detect the oil content of the second clean water;

[0020] a three-way valve, the three-way valve comprising a first interface, a second interface and a third interface, the first interface being in communication with the first outlet to receive the second clean water, and the three-way valve being configured to discharge the second clean water from the second interface or the third interface.

[0021] In some embodiments, the sewage treatment device further comprises a first pump body having an eighth outlet, the eighth outlet being in communication with the first outlet, the first pump body being configured to sequentially pass flushing liquid through the eighth outlet, the first outlet and the second outlet to the filter.

[0022] In the second aspect, the embodiments of the present application further provide a sewage treatment method, applied to the sewage treatment device of any one of the first aspect of the present application, the sewage treatment method comprising the following steps:

[0023] inputting first sewage through the first inlet into the first chamber;

[0024] inputting the dissolved air water through the second inlet into the second sub-chamber, the dissolved air water and the first sewage generating first clean water;

[0025] inputting the dissolved air water through the fourth inlet into the first sub-chamber, and inputting the first clean water through the third inlet into the first sub-chamber, so that the dissolved air water and the first clean water generate second clean water;

[0026] sequentially discharging the second clean water through the second outlet and the first outlet.

[0027] In some embodiments, the step of generating second clean water from the dissolved air water and the first clean water comprises:

[0028] treating the first clean water by the dissolved air water to obtain third clean water;

[0029] filtering the third clean water by a filter to obtain second clean water.

[0030] In some embodiments, the sewage treatment method further comprises:

[0031] obtaining a first pressure value, the first pressure value being a sum of pressure values of two paths of the dissolved air water;

[0032] obtaining a second pressure value, the second pressure value being a pressure value of the first outlet;

[0033] in the case where a difference between the first pressure value and the second pressure value is greater than a pressure difference threshold a, stopping injection of the first sewage, and a first pump body sequentially passing flushing liquid through the eighth outlet, the first outlet and the second outlet to the filter to flush the filter;

[0034] wherein the pressure difference threshold a satisfies: a≤4bar.

[0035] In some embodiments, the sewage treatment method further comprises:

[0036] When the oil content of the second cleaning water is less than the oil content threshold b, the first and second ports of the three-way valve are opened, and the second cleaning water is discharged from the second port.

[0037] If the oil content of the second cleaning water is greater than or equal to the oil content threshold b, the first interface and the third interface are connected, and the second cleaning water is discharged from the third interface.

[0038] Wherein, the oil quantity threshold b satisfies: b≤15PPM.

[0039] In some embodiments, the wastewater treatment method further includes:

[0040] When dissolved air water is introduced into the first sub-chamber and the second sub-chamber, the third outlet and the fifth inlet are opened to input the floating impurities into the second chamber;

[0041] At each first time interval, the fourth outlet and the sixth inlet are opened to introduce the first precipitated impurities into the second chamber;

[0042] When the water level of the second wastewater in the second chamber reaches the first liquid level, the second wastewater in the second chamber is discharged through the fifth outlet after a second time delay.

[0043] Every third time interval, the second precipitated impurities in the second chamber are discharged through the sixth outlet.

[0044] Compared with the prior art, the wastewater treatment device provided in this application includes an air flotation filter tank. The air flotation filter tank is used to receive first wastewater and dissolved air water. Impurities in the first wastewater are adsorbed by microbubbles in the dissolved air water, thereby separating the impurities and achieving the purpose of wastewater treatment. In this application, the air flotation filter tank includes a first shell wall, which encloses a first chamber, providing space for wastewater treatment. In this application, the first shell wall has a first inlet, a second inlet, and a first outlet. The first inlet and the second inlet are used to receive the first wastewater and the dissolved air water, respectively, and the first outlet is used to output the treated second wastewater. Clean water; In this application, the air flotation filter tank also includes a second shell wall, which is located in the first chamber. The second shell wall encloses and forms a first sub-chamber. The second shell wall and the first shell wall enclose the second sub-chamber. The second shell wall has a third inlet, a fourth inlet, and a second outlet. The third inlet connects the first sub-chamber and the second sub-chamber so that the first clean water flows from the second sub-chamber into the first sub-chamber. The fourth inlet is used to connect dissolved air water to reduce the difference in the content of microbubbles in the first sub-chamber and the second sub-chamber, that is, to reduce the difference in the content of microbubbles at the edge and the middle of the first chamber, thereby improving the removal effect of impurities in the first sub-chamber.

[0045] This application provides a wastewater treatment method applied to the wastewater treatment device provided in this application. First wastewater is injected into a first chamber through a first inlet, dissolved air water is injected into a second sub-chamber through a second inlet, and dissolved air water is injected into the first sub-chamber through a fourth inlet. The dissolved air water adsorbs impurities, separating them from the wastewater to achieve the purpose of wastewater treatment. In this application, the injection of dissolved air water into the first and second sub-chambers reduces the difference in microbubble content between the two chambers, specifically reducing the difference in microbubble content between the edge and center of the first chamber, thereby improving the removal efficiency of impurities in the first sub-chamber. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of the wastewater treatment device provided in the embodiments of this application;

[0048] Figure 2 This is a schematic diagram of the structure of the three-way valve in the wastewater treatment device provided in the embodiments of this application;

[0049] Figure 3 A flowchart of the wastewater treatment method provided in the embodiments of this application (showing steps a, b, c, d and e);

[0050] Figure 4 A wireframe flowchart of a wastewater treatment method provided in an embodiment of this application;

[0051] Figure 5 This is a flowchart illustrating step c in the wastewater treatment method provided in the embodiments of this application.

[0052] Figure 6 This is a flowchart illustrating step f in the wastewater treatment method provided in the embodiments of this application.

[0053] Figure 7 This is a flowchart illustrating step h of the wastewater treatment method provided in the embodiments of this application.

[0054] Reference numerals: 10, Air flotation filter tank; 11, First shell wall; 111, First chamber; 1111, First sub-chamber; 1112, Second sub-chamber; 112, First inlet; 113, Second inlet; 114, First outlet; 115, Third outlet; 116, Fourth outlet; 117, Regulating valve; 12, Second shell wall; 121, Third inlet; 122, Fourth inlet; 123, Second outlet; 20, Buffer tank; 21, Third shell wall; 211, Second chamber; 212, Fifth inlet; 213, Sixth inlet; 214, Sixth outlet; 215, Fifth outlet; 30, Filter; 31, Seventh outlet; 40, First pump body; 41, Eighth outlet; 52, Oil content meter; 53, Three-way valve; 531, First interface; 532, Second interface; 533, Third interface; 60, Second pump body; 61, Seventh inlet; X, First direction. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0056] Please see Figures 1-2This application provides a wastewater treatment device, including an air flotation filter tank 10. The air flotation filter tank 10 is used to receive first wastewater and dissolved air water. Impurities in the first wastewater are adsorbed by microbubbles in the dissolved air water, thereby separating the impurities and achieving the purpose of wastewater treatment. In this application, the air flotation filter tank 10 includes a first shell wall 11, which encloses a first chamber 111, providing space for wastewater treatment. In this application, the first shell wall 11 has a first inlet 112, a second inlet 113, and a first outlet 114. The first inlet 112 and the second inlet 113 are used to receive the first wastewater and the dissolved air water, respectively, and the first outlet 114 is used to output treated second clean water. In this application, the air flotation filter tank 10 also includes a second shell wall 12, which is located... In the first chamber 111, the second shell wall 12 encloses and forms the first sub-chamber 1111. The first sub-chamber 1111 is a tubular chamber that runs vertically through the interior. The second shell wall 12 and the first shell wall 11 enclose and form the second sub-chamber 1112. The second shell wall 12 has a third inlet 121, a fourth inlet 122, and a second outlet 123. The third inlet 121 connects the first sub-chamber 1111 and the second sub-chamber 1112 so that the first cleaning water flows from the second sub-chamber 1112 into the first sub-chamber 1111. The fourth inlet 122 is used to introduce dissolved air water into the first sub-chamber 1111 to reduce the difference in the content of microbubbles in the first sub-chamber 1111 and the second sub-chamber 1112, that is, to reduce the difference in the content of microbubbles between the edge and the middle of the first chamber 111, thereby improving the removal effect of impurities in the first sub-chamber 1111.

[0057] Please see Figure 1In some embodiments, the first wastewater enters the second sub-chamber 1112 through the first inlet 112, and the dissolved air water enters the second sub-chamber 1112 through the second inlet 113. In the second sub-chamber 1112, some smaller impurities in the first wastewater are adsorbed by microbubbles in the dissolved air water and detach from the first wastewater, floating to the upper part of the liquid surface to form floating impurities. Some larger impurities in the first wastewater settle to the bottom, forming first precipitated impurities. The treated first wastewater becomes first clean water. The first clean water enters the first sub-chamber 1111 through the third inlet 121, and the dissolved air water enters the first sub-chamber 1111 through the fourth inlet 122. In the first sub-chamber 1111, the first clean water undergoes further impurity separation using dissolved air water, further separating floating impurities and first precipitated impurities from the first clean water. These impurities flow out from both ends of the first sub-chamber 1111, respectively, and converge with the floating impurities and first precipitated impurities separated from the first wastewater. The treated first clean water becomes the third clean water, which is then further filtered to generate the second clean water. In this application, the second outlet 123 is connected to the first outlet 114, and the second clean water is discharged after passing through the second outlet 123 and the first outlet 114 in sequence.

[0058] In some embodiments, the air flotation filter tank 10 is made of 316 stainless steel.

[0059] Please see Figure 1 In some embodiments, the wastewater treatment device further includes a filter 30 located in the first sub-chamber 1111. The filter 30 is used to filter the third clean water to generate a second clean water. In this application, the filter 30 has a seventh outlet 31, which is connected to the second outlet 123. The seventh outlet 31 is used to output the second clean water generated by the filter 30. Specifically, the filter 30 is a hydrophilic micron filter element, and the material of the filter 30 is 316 stainless steel.

[0060] Please see Figure 1 In some embodiments, there are multiple filters 30; in this application, two filters 30 are provided.

[0061] Please see Figure 1 In some embodiments, the first housing wall 11 further has a third outlet 115 and a fourth outlet 116, the third outlet 115 being used to discharge floating impurities and the fourth outlet 116 being used to discharge first precipitated impurities. Specifically, the third outlet 115 is located at the top of the flotation filter tank 10 to receive floating impurities; the fourth outlet 116 is located at the bottom of the flotation filter tank 10 to receive the first precipitated impurities.

[0062] Please see Figure 1In some embodiments, the floating direction of microbubbles in dissolved air water is taken as the first direction X, that is, the direction extending from the bottom to the top of the air flotation filter tank 10 is taken as the first direction X; along the first direction X, the first inlet 112 is located on the side of the second inlet 113 away from the fourth outlet 116, so that the injection position of dissolved air water is below the injection position of the first sewage, which increases the floating distance of microbubbles in the first sewage, increases the residence time of microbubbles in the first sewage, and allows microbubbles to adsorb more impurities; along the first direction X, the fourth inlet 122 is located on the side of the second inlet 113 close to the fourth outlet 116, and the third outlet 115 and the fourth outlet 116 are respectively located at both ends of the second shell wall 12; along the first direction X, the two ends of the first sub-chamber 1111 are connected so that the floating impurities and the first precipitated impurities separated from the first clean water flow out from the two through ports respectively.

[0063] Please see Figure 1 In some embodiments, the wastewater treatment device further includes a first pump body 40, which is a backwash pump used to reverse the flow of flushing liquid into the filter 30 when the filter 30 is clogged, to flush the blockage. Specifically, the first pump body 40 has an eighth outlet 41, which is connected to the first outlet 114. The first pump body 40 is used to sequentially flow flushing liquid into the filter 30 through the eighth outlet 41, the first outlet 114, the second outlet 123, and the seventh outlet 31. In some embodiments, there are multiple filters 30, which are arranged in parallel and connected to the first pump body 40.

[0064] Please see Figure 1 In some embodiments, the wastewater treatment device further includes a buffer tank 20, which is connected to the flotation filter tank 10. The buffer tank 20 is used to receive floating impurities and first precipitated impurities output from the flotation filter tank 10, and to separate the floating impurities and first precipitated impurities by natural sedimentation to generate second wastewater and second precipitated impurities for discharge. Specifically, the buffer tank 20 includes a third shell wall 21, which encloses to form a second chamber 211. The second chamber 211 is connected to the first chamber 111 through a third outlet 115 and a fourth outlet 116, respectively. The buffer tank 20 is configured to receive floating impurities and first precipitated impurities and store them in the second chamber 211.

[0065] In some embodiments, the buffer tank 20 is made of 316 stainless steel.

[0066] Please see Figure 1In some embodiments, the third housing wall 21 has a fifth inlet 212 and a sixth inlet 213, located at both ends of the third housing wall 21 along the first direction X. Specifically, the fifth inlet 212 is connected to the third outlet 115 and the second chamber 211, and is used to receive floating impurities output from the air flotation filter tank 10 and input them into the second chamber 211; the sixth inlet 213 is connected to the fourth outlet 116 and the second chamber 211, and is used to receive first precipitated impurities output from the air flotation filter tank 10 and input them into the second chamber 211.

[0067] Please see Figure 1 In some embodiments, the third housing wall 21 further has a fifth outlet 215 and a sixth outlet 214. The fifth outlet 215 is used to discharge the second wastewater in the second chamber 211, and the sixth outlet 214 is used to discharge the second precipitate in the second chamber 211. Specifically, along the first direction X, the fifth outlet 215 is located between the fifth inlet 212 and the sixth inlet 213, and the fifth outlet 215 communicates with the second chamber 211 to receive and discharge the second wastewater in the second chamber 211. Along the first direction X, the sixth outlet 214 is located on the side of the sixth inlet 213 away from the fifth outlet 215, and the sixth outlet 214 communicates with the second chamber 211 to receive and discharge the second precipitated impurities in the second chamber 211.

[0068] Please see Figure 1 In some embodiments, the wastewater treatment device further includes a second pump body 60, which has a seventh inlet 61 connected to a sixth outlet 214. The seventh inlet 61 is used to introduce the second precipitated impurities in the second chamber 211 into the second pump body 60 through the sixth outlet 214, and to pump the second precipitated impurities through the second pump body 60. Specifically, the second pump body 60 is a diaphragm pump.

[0069] Please see Figures 1-2In some embodiments, the wastewater treatment device further includes a detection device connected to the air flotation filter tank 10, used to detect the oil content of the second clean water, and to input the second clean water with the required oil content and the second clean water with the unsatisfactory oil content to different locations respectively; specifically, the detection device includes an oil content meter 52 and a three-way valve 53, the oil content meter 52 is connected to the first outlet 114, and the oil content meter 52 is used to detect the oil content of the second clean water; the three-way valve 53 includes a first interface 531, a second interface 532 and a third interface 533. The first port 531 is connected to the first outlet 114 to receive the second clean water. The three-way valve 53 is used to discharge the second clean water from the second port 532 or the third port 533 and is connected to the first outlet 114. Specifically, when the oil content of the second clean water meets the requirements, the first port 531 and the second port 532 are connected, and the second clean water is discharged through the second port 532. When the oil content of the second clean water does not meet the requirements, the first port 531 and the third port 533 are connected, and the second clean water is discharged through the third port 533.

[0070] Please see Figure 1 In some embodiments, the wastewater treatment device further includes a regulating valve 117, which is connected to a third outlet 115, and the discharge rate of floating impurities is adjusted by adjusting the opening of the regulating valve 117.

[0071] In some embodiments, the wastewater treatment apparatus further includes a turbidity meter connected to the first housing wall 11. Along a first direction, the turbidity meter is located on the side of the first housing wall 11 near the third outlet 115, i.e., the turbidity meter is located at the top of the flotation filter tank and extends through the first housing wall 11 into the first chamber 111. The turbidity meter is used to detect the turbidity of the first and second clean water. When the turbidity does not meet the requirements, the outlet of the filter 30 is closed, and the opening of the regulating valve 117 is increased to increase the sludge discharge rate of the third outlet 115, thereby adjusting the turbidity of the first and second clean water.

[0072] Understandably, the wastewater treatment device provided in this application includes an air flotation filter tank 10. The air flotation filter tank 10 is used to receive first wastewater and dissolved air water. Impurities in the first wastewater are adsorbed by microbubbles in the dissolved air water, thereby separating the impurities and achieving the purpose of wastewater treatment. In this application, the air flotation filter tank 10 includes a first shell wall 11, which encloses a first chamber 111, providing space for wastewater treatment. In this application, the first shell wall 11 has a first inlet 112, a second inlet 113, and a first outlet 114. The first inlet 112 and the second inlet 113 are respectively used to receive the first wastewater and the dissolved air water, and the first outlet 114 is used to output the treated second clean water. In this application, the air flotation filter tank 10 also includes a... The second shell wall 12 is located in the first chamber 111 and encloses the first sub-chamber 1111. The second shell wall 12 and the first shell wall 11 enclose the second sub-chamber 1112. The second shell wall 12 has a third inlet 121, a fourth inlet 122 and a second outlet 123. The third inlet 121 connects the first sub-chamber 1111 and the second sub-chamber 1112 so that the first cleaning water flows from the second sub-chamber 1112 into the first sub-chamber 1111. The fourth inlet 122 is used to introduce dissolved air water to reduce the difference in the content of microbubbles in the first sub-chamber 1111 and the second sub-chamber 1112, that is, to reduce the difference in the content of microbubbles between the edge and the middle of the first chamber 111, thereby improving the removal effect of impurities in the first sub-chamber 1111.

[0073] Please see Figures 3-7 Accordingly, embodiments of this application also provide a wastewater treatment method applied to the wastewater treatment apparatus provided in the embodiments of this application. The wastewater treatment method provided in the embodiments of this application injects first wastewater into the first chamber 111 through the first inlet 112, injects dissolved air water into the second sub-chamber 1112 through the second inlet 113, and injects dissolved air water into the first sub-chamber 1111 through the fourth inlet 122. The dissolved air water adsorbs impurities to separate impurities in the wastewater and achieve the purpose of wastewater treatment. In this application, the injection of dissolved air water into the first sub-chamber 1111 and the second sub-chamber 1112 reduces the difference in the content of microbubbles in the first sub-chamber 1111 and the second sub-chamber 1112, that is, reduces the difference in the content of microbubbles between the edge and the middle of the first chamber 111, thereby improving the removal effect of impurities in the first sub-chamber 1111.

[0074] Please see Figures 3-7 In some embodiments, the wastewater treatment method provided in this application specifically includes the following steps:

[0075] In some embodiments, before wastewater treatment, clean water is first injected into the flotation filter tank 10. When the clean water level overflows the filter 30 and reaches the second level, the injection of clean water is stopped. Injecting clean water increases the flow rate of the first wastewater, the first clean water, and the second clean water, which is beneficial for the rapid progress of wastewater treatment. The height of the second level is set according to the specific project, ensuring that it overflows the filter 30 to wet it.

[0076] Step a: Introduce the first wastewater into the first chamber 111 through the first inlet 112.

[0077] In some embodiments, before the first wastewater is introduced into the first chamber 111, a flocculant is added to the first wastewater, which can promote the aggregation of impurities and form larger flocs, which is beneficial for the sedimentation and separation of impurities.

[0078] Step b: Dissolved air water is introduced into the second sub-chamber 1112 through the second inlet 113, and the dissolved air water and the first wastewater generate the first clean water.

[0079] Step c: Dissolved gas water is introduced into the first sub-chamber 1111 through the fourth inlet 122, and first clean water is introduced into the first sub-chamber 1111 through the third inlet 121, so that the dissolved gas water and the first clean water generate second clean water.

[0080] Please see Figure 5 Step c1: The first clean water is treated with dissolved air water to obtain the third clean water.

[0081] Step c2: Filter the third cleaning water through filter 30 to obtain the second cleaning water.

[0082] Step d: Discharge the second clean water through the second outlet 123 and the first outlet 114 in sequence.

[0083] Step e: Detect the oil content of the second cleaning water and discharge it to different locations based on the oil content:

[0084] In some embodiments, when the oil content of the second cleaning water is less than the oil content threshold b, the first port 531 and the second port 532 of the three-way valve 53 are opened, and the second cleaning water is discharged from the second port 532.

[0085] When the oil content of the second cleaning water is greater than or equal to the oil content threshold b, the first interface 531 and the third interface 533 are connected, and the second cleaning water is discharged from the third interface 533.

[0086] In some embodiments, the oil content threshold b satisfies: b ≤ 15 PPM. In some embodiments, direct discharge into the sea when the oil content is less than or equal to 15 PPM is beneficial to environmental protection.

[0087] In some embodiments, the fuel quantity threshold b can be any value from 3PPM, 6PPM, 9PPM, 12PPM, 15PPM, or any combination of two values ​​to form any value in the numerical range.

[0088] Please see Figure 6 In some embodiments, the wastewater treatment method further includes:

[0089] Step f: When filter 30 is clogged, flush filter 30.

[0090] Step f1: Obtain the first pressure value, which is the sum of the pressure values ​​of the two dissolved air water streams;

[0091] Step f2: Obtain the second pressure value, which is the pressure value of the first outlet 114;

[0092] Step f3: When the difference between the first pressure value and the second pressure value is greater than the differential pressure threshold a, the injection of the first sewage is stopped, and the first pump body 40 sequentially introduces flushing liquid into the filter 30 through the eighth outlet 41, the first outlet 114 and the second outlet 123 to flush the filter 30.

[0093] In some embodiments, the differential pressure threshold a satisfies: a≤4bar. Under this differential pressure threshold, the backwashing effect is better, and the amount of fresh water required during backwashing is small, which can effectively extend the life cycle of the filter 30.

[0094] In some embodiments, the differential pressure threshold α can be any value selected from 2 bar, 3 bar, 4 bar, or any combination of two values ​​to form any value in the range.

[0095] In some embodiments, when there are multiple filters 30, the multiple filters are respectively led out from the corresponding first outlet 114, the second pressure value is the sum of the pressure values ​​of the multiple first outlets 114, and each filter 30 is flushed in sequence. While flushing the current filter 30, the other filters 30 operate normally.

[0096] In some embodiments, the wastewater treatment method further includes:

[0097] Step g: Discharge floating impurities and first precipitated impurities.

[0098] With dissolved air water flowing into the first sub-chamber 1111 and the second sub-chamber 1112, the third outlet 115 and the fifth inlet 212 are opened to input floating impurities into the second chamber 211.

[0099] At each first time interval, the fourth outlet 116 and the sixth inlet 213 are opened to input the first precipitated impurities into the second chamber 211;

[0100] When the water level of the second sewage in the second chamber 211 reaches the first liquid level, the second sewage in the second chamber 211 is discharged through the fifth outlet 215 after a second time delay.

[0101] At each third time interval, the second precipitated impurities in the second chamber 211 are discharged through the sixth outlet 214.

[0102] Please see Figure 7 In some embodiments, the wastewater treatment method further includes:

[0103] Step h: Adjust the turbidity of the first and second cleaning water.

[0104] Step h1: Obtain the turbidity values ​​of the first and second clean water using a turbidity meter;

[0105] Step h2: When the turbidity value is greater than or equal to the turbidity threshold e, close the outlet of filter 30, adjust the opening of regulating valve 117 to the opening c, increase the discharge speed of floating impurities, and accelerate the reduction of turbidity of the first and second clean water.

[0106] In some embodiments, the opening degree c satisfies: 10°≤c≤40°. In this application, the opening degree c of the regulating valve 117 is calculated based on the slag discharge volume. In this application, the ratio of the slag discharge volume to the sewage treatment volume is 1:200, confirming that the opening degree c is 10°-40°.

[0107] In some embodiments, the opening c can be any value from 10°, 15°, 20°, 25°, 30°, 35°, 40° or any value from an interval consisting of any two values.

[0108] In some embodiments, the turbidity threshold e satisfies: 800≤e≤1000. When confirming the turbidity threshold e, this application first obtains a sample of the first wastewater and confirms that the turbidity threshold e is twice the maximum turbidity of the sample of the first wastewater.

[0109] In some embodiments, the turbidity threshold e can be any value from 800, 820, 840, 860, 880, 900, 920, 940, 960, 980, 1000 or any value within an interval consisting of any two values.

[0110] When the turbidity value is less than the turbidity threshold e, adjust the opening of the regulating valve 117 to the opening degree d, and open the outlet of the filter 30.

[0111] In some embodiments, the opening d satisfies: 100° ≤ d.

[0112] Understandably, the wastewater treatment method provided in this application embodiment is applied to the wastewater treatment device provided in this application embodiment. First wastewater is injected into the first chamber 111 through the first inlet 112, dissolved air water is injected into the second sub-chamber 1112 through the second inlet 113, and dissolved air water is injected into the first sub-chamber 1111 through the fourth inlet 122. The dissolved air water adsorbs impurities to separate impurities in the wastewater and achieve the purpose of wastewater treatment. In this application, dissolved air water is injected into the first sub-chamber 1111 and the second sub-chamber 1112 to reduce the difference in the content of microbubbles in the first sub-chamber 1111 and the second sub-chamber 1112, that is, to reduce the difference in the content of microbubbles between the edge and the middle of the first chamber 111, thereby improving the removal effect of impurities in the first sub-chamber 1111.

[0113] This application has provided a detailed description of a wastewater treatment apparatus and method provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A wastewater treatment device, characterized in that, Includes an air flotation filter tank (10) and a filter (30), wherein the air flotation filter tank (10) comprises: A first housing wall (11) is formed by enclosing a first chamber (111), and the first housing wall (11) has a first inlet (112), a second inlet (113) and a first outlet (114); The second housing wall (12) is located inside the first chamber (111). The second housing wall (12) encloses and forms the first sub-chamber (1111). The second housing wall (12) and the first housing wall (11) enclose and form the second sub-chamber (1112). The second housing wall (12) has a third inlet (121), a fourth inlet (122), and a second outlet (123). The third inlet (121) connects the first sub-chamber (1111) and the second sub-chamber (1112). The second outlet (123) connects the first outlet (114). The first sub-chamber (1111) is a vertically connected chamber. The filter (30) is located in the first sub-chamber (1111). The first inlet (112) is configured to input the first wastewater, the second inlet (113) and the fourth inlet (122) are both configured to input dissolved air water, the third inlet (121) is configured to input the first clean water, the second outlet (123) is configured to output the second clean water and discharge it through the first outlet (114), the filter (30) is configured to filter the third clean water to generate the second clean water, the first clean water is obtained based on the dissolved air water and the first wastewater, and the third clean water is the clean water obtained by treating the first clean water with the dissolved air water.

2. The wastewater treatment device according to claim 1, characterized in that, The first housing wall (11) also has a third outlet (115) and a fourth outlet (116), the third outlet (115) being configured to output floating impurities in the first wastewater and the first clean water, and the fourth outlet (116) being configured to output first precipitated impurities in the first wastewater and the first clean water.

3. The wastewater treatment device according to claim 2, characterized in that, The floating direction of the microbubbles in the dissolved air water is the first direction (X). Along the first direction (X): the first inlet (112) is located on the side of the second inlet (113) away from the fourth outlet (116), the fourth inlet (122) is located on the side of the second inlet (113) close to the fourth outlet (116), and the third outlet (115) and the fourth outlet (116) are located at both ends of the second shell wall (12).

4. The wastewater treatment device according to claim 3, characterized in that, The wastewater treatment device also includes a buffer tank (20), which includes a third shell wall (21) that encloses to form a second chamber (211); The second chamber (211) is connected to the first chamber (111) via the third outlet (115) and the fourth outlet (116), respectively. The buffer tank (20) is configured to receive the floating impurities and the first precipitated impurities and store them in the second chamber (211).

5. The wastewater treatment device according to claim 4, characterized in that, The third housing wall (21) has a fifth inlet (212) and a sixth inlet (213), which are located at both ends of the third housing wall (21) along the first direction (X).

6. The wastewater treatment device according to claim 5, characterized in that, The third shell wall (21) also has: The fifth outlet (215), along the first direction (X), is located between the fifth inlet (212) and the sixth inlet (213), and is configured to output a second wastewater, which is wastewater generated after the floating impurities and the first precipitated impurities have undergone sedimentation and stratification; The sixth outlet (214), along the first direction (X), is located on the side of the sixth inlet (213) away from the fifth outlet (215), and the sixth outlet (214) is configured to output a second precipitated impurity, which is a precipitate generated after the floating impurity and the first precipitated impurity are separated into layers.

7. The wastewater treatment device according to claim 1, characterized in that, The wastewater treatment device also includes: An oil content meter (52) is connected to the first outlet (114) and is configured to detect the oil content of the second cleaning water. A three-way valve (53) includes a first port (531), a second port (532) and a third port (533), the first port (531) being connected to the first outlet (114) to receive second clean water, the three-way valve (53) being configured to discharge the second clean water from the second port (532) or the third port (533).

8. The wastewater treatment device according to claim 1, characterized in that, The wastewater treatment device further includes a first pump body (40) having an eighth outlet (41) connected to the first outlet (114). The first pump body (40) is configured to sequentially introduce flushing liquid into the filter (30) through the eighth outlet (41), the first outlet (114), and the second outlet (123).

9. A wastewater treatment method, characterized in that, The wastewater treatment method, applied to any one of claims 1-8, comprises the following steps: The first wastewater is introduced into the first chamber (111) through the first inlet (112); The dissolved air water is introduced into the second sub-chamber (1112) through the second inlet (113), and the dissolved air water and the first wastewater generate the first clean water; The dissolved air water is introduced into the first sub-chamber (1111) through the fourth inlet (122), and the first clean water is introduced into the first sub-chamber (1111) through the third inlet (121), so that the dissolved air water and the first clean water generate a third clean water; The second clean water is discharged sequentially through the second outlet (123) and the first outlet (114).

10. The wastewater treatment method according to claim 9, characterized in that, The step of generating the second clean water from the dissolved air water and the first clean water includes: The first clean water is treated with dissolved air water to obtain the third clean water; The third clean water is filtered through a filter to obtain the second clean water.

11. The wastewater treatment method according to claim 9, characterized in that, The wastewater treatment method further includes: Obtain a first pressure value, which is the sum of the pressure values ​​of the two dissolved air water streams; Obtain a second pressure value, which is the pressure value at the first outlet (114); If the difference between the first pressure value and the second pressure value is greater than the differential pressure threshold a, the injection of the first sewage is stopped, and the first pump body (40) sequentially introduces flushing liquid into the filter (30) through the eighth outlet (41), the first outlet (114), and the second outlet (123) to flush the filter (30). The differential pressure threshold a satisfies the condition: a≤4bar.

12. The wastewater treatment method according to claim 9, characterized in that, The wastewater treatment method further includes: When the oil content of the second cleaning water is less than the oil content threshold b, the first port (531) and the second port (532) of the three-way valve (53) are opened, and the second cleaning water is discharged from the second port (532). When the oil content of the second cleaning water is greater than or equal to the oil content threshold b, the first interface (531) and the third interface (533) are connected, and the second cleaning water is discharged from the third interface (533). Wherein, the oil quantity threshold b satisfies: b≤15PPM.

13. The wastewater treatment method according to claim 9, characterized in that, The wastewater treatment method further includes: When dissolved air water is introduced into the first sub-chamber (1111) and the second sub-chamber (1112), the third outlet (115) and the fifth inlet (212) are opened to input floating impurities into the second chamber (211); At each first time interval, the fourth outlet (116) and the sixth inlet (213) are opened to input the first precipitated impurities into the second chamber (211); When the water level of the second sewage in the second chamber (211) reaches the first liquid level, the second sewage in the second chamber (211) is discharged through the fifth outlet (215) after a second time delay. Every third time interval, the second precipitated impurities in the second chamber (211) are discharged through the sixth outlet (214).

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