A plasticizer wastewater treatment system and treatment method

Abstract

The present invention discloses a plasticizer wastewater treatment system and a treatment method, which relate to the technical field of wastewater treatment devices. The treatment system of the present invention includes a scum cleaning unit including a tank A. A pair of porous plates A in a shape of "eight" are arranged between a pair of opposite inner side walls of the tank A. A pair of porous plates B in an inverted "eight" shape are also arranged between a pair of opposite inner side walls of the tank A on both sides of the two porous plates A. A bottom plate is connected between the bottom ends of the porous plates B and the bottom ends of the porous plates A. At least one slag discharge pipe is communicated with the bottom plate, and the slag discharge pipe penetrates through the bottom side surface of the tank A. A water inlet pipe is also penetratingly arranged on the bottom side surface of the tank A between the two porous plates A, and the top of the water inlet pipe extends to the middle position of the porous plates A. A drain pipe is penetratingly arranged on the tank A outside the porous plates A. An air flotation port is formed between the two porous plates A, and a closing plate is arranged on the air flotation port. Through the arrangement of the scum cleaning unit, the present invention realizes the cleaning of scum by controlling the change of the liquid level in the tank A during use.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment devices, and particularly relates to a plasticizer wastewater treatment system and a treatment method. Background Technique

[0002] Plasticizers, also known as plasticizers, are widely used high-molecular material additives in industry. Adding this substance in plastic processing can enhance its flexibility and make it easy to process, and it can be legally used for industrial purposes. There are more than a hundred kinds of plasticizers, but the most commonly used one is dioctyl phthalate. Dioctyl phthalate is a colorless and transparent liquid, mainly used in the processing of polyvinyl chloride resin, and can also be used in the processing of chemical fiber resin, acetic acid resin, ABS resin and rubber and other high polymers, and can also be used in paint making, dyes, dispersants, etc. The products plasticized by this product are mostly used in fields such as medicine, food, insulation, high temperature, and sunscreen products.

[0003] In the production process of dioctyl phthalate, a large amount of high-concentration organic wastewater will be generated. If the wastewater is discharged randomly without treatment, it will cause serious water pollution; for example, CN102936074A discloses a pretreatment method for epoxy plasticizer production wastewater, and the specific steps are as follows: The first step: After acidifying and demulsifying the epoxy plasticizer production wastewater, first perform microporous aeration to remove oil, then use a fully automatic oil skimmer to skim off the grease, and adjust the pH value of the wastewater to 4.5 - 5.5; The second step: Pump the wastewater treated in the first step into a flotation device for flotation treatment. The dosing sequence during the operation of the flotation device is: first add polyaluminum chloride, then add alkali solution to adjust the pH value to 7.5 - 8.5, and finally add anionic polyacrylamide. The effluent of the flotation device is filtered with quartz sand; The third step: Pass the wastewater treated in the second step through a filter tank filled with natural manganese sand in a bottom-up manner to remove the residual hydrogen peroxide in the wastewater, and obtain the pretreated epoxy plasticizer production wastewater; In the above, the addition of polyaluminum chloride and the like will generate floating scum, and the existing plasticizer production wastewater treatment equipment has the problem that it is inconvenient to clean the floating scum. Summary of the Invention

[0004] The purpose of the present invention is to provide a plasticizer wastewater treatment system and a treatment method. Through the setting of a floating scum cleaning unit, the change of the liquid level in tank A is controlled during use to clean the floating scum, and the problems raised in the existing background technology are solved.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention relates to a plasticizer wastewater treatment system, including a scum cleaning unit; the scum cleaning unit includes a tank A, between a pair of opposite inner sidewalls of the tank A, there are provided a pair of porous plates A in an "eight" shape, and between a pair of opposite inner sidewalls of the tank A on both sides of the two porous plates A, there are also provided a pair of porous plates B in an inverted "eight" shape; between the bottom ends of the porous plates B and the bottom ends of the porous plates A, there is connected a bottom plate, and at least one slag discharge pipe is communicated with the bottom plate, and the slag discharge pipe penetrates through the bottom side of the tank A; on the bottom side of the tank A between the two porous plates A, there is also penetrated and provided a water inlet pipe, and the top of the water inlet pipe extends to the middle position of the porous plate A; on the tank A outside the porous plate A, there is penetrated and provided a drain pipe; between the two porous plates A, there is formed an air flotation port, and a closing plate is provided on the air flotation port.

[0007] Further, both ends of the closing plate are respectively connected with a connecting column, the top ends of the connecting columns are respectively connected with a cross bar, both ends of the cross bar are respectively connected with a floating block A through a suspension rod, and there are also at least two guide rods A that movably penetrate through the floating block A and the bottom ends of which are fixed on the bottom side of the tank A.

[0008] Further, between a pair of opposite inner sidewalls of the tank A directly above the bottom plate, there is connected a longitudinal beam, and movably penetrating through the longitudinal beam, there are provided movable rods that are matched with the number of the slag discharge pipes, the bottom ends of the movable rods are provided with blocking blocks for cooperatively blocking the slag discharge pipes, and the top ends of the movable rods are connected with a top plate; between a pair of opposite inner sidewalls of the tank A, there is connected a longitudinal rod, and at least two pulleys are arranged along the length direction on the outer side of the longitudinal rod; and the porous plate B is located between the longitudinal beam and the longitudinal rod; a traction rope is connected to the top plate, the end of the traction rope is connected with a floating block B, and the traction rope passes through the pulley; there are also at least two guide rods B that movably penetrate through the floating block B and the bottom ends of which are fixed on the bottom side of the tank A, and a limiting plate is arranged at the top of the guide rod B.

[0009] Further, when the liquid level in the tank A rises to a first height, the floating block A rises, thereby driving the closing plate to separate from the air flotation port; when the liquid level in the tank A drops to a second height, the floating block B drops, driving the blocking block to move upward and separate from the slag discharge pipe; the first height is higher than the top of the porous plate A, and the second height is lower than the bottom of the porous plate A.

[0010] Further, the top end of the porous plate B is provided with a baffle that extends upward, and the baffle is located between the top of the porous plate A and the first height.

[0011] Further, it further includes a filtering unit. The filtering unit includes a tank B, and the tank B includes at least two filtering structures from bottom to top; the sizes of the filtering holes of the filtering structures gradually increase from bottom to top; a drain pipe is communicatively arranged at the bottom of the filtering structure; a blocking plate for blocking the drain pipe is arranged in any one of the filtering structures, the blocking plate is connected to a connecting frame through a connecting rod A, and connecting rods B penetrating through the filtering plate are connected to the periphery of the connecting frame; a cross beam is arranged at the top of the tank B, and a telescopic motor is connected to the bottom surface of the cross beam to connect a connecting frame at the topmost part.

[0012] Further, the tank B includes a first filtering plate, a second filtering plate and a third filtering plate from bottom to top; the first filtering plate, the second filtering plate and the third filtering plate are all in a conical plate shape; and a conical drainage part is arranged at the bottom of the tank B, and the drain pipe extends to the outside of the tank B.

[0013] Further, valves A and valves B are arranged on the water inlet pipe and the drain pipe, a liquid level sensor A is arranged in the tank A, and a liquid level sensor B is arranged in the tank B; it further includes a controller, and the controller is connected to the valve A, the valve B, the liquid level sensor B, the liquid level sensor A and the telescopic motor.

[0014] Further, it further includes a chemical regulation unit and a biological treatment unit; the scum cleaning unit, the filtering unit, the chemical regulation unit and the biological treatment unit are arranged in sequence from top to bottom; a spray pipe for cleaning the scum between the porous plate B and the porous plate A is arranged in the tank A.

[0015] A method for treating plasticizer wastewater uses a plasticizer wastewater treatment system as described above. The wastewater treatment method includes the following steps:

[0016] Stp1. Discharge the plasticizer wastewater into the tank A through the water inlet pipe.

[0017] Stp2. After a period of time, close the valve A until the liquid level in the tank A rises to the first height. At this time, the scum flows into the area formed by the porous plate B and the porous plate A through the air flotation port.

[0018] Stp3. Open the valve A until the liquid level in the tank A drops to the third height, and start the spray pipe to clean the scum.

[0019] Stp4. Continue to wait until the liquid level in the tank A drops to the second height. At this time, the scum is discharged from the slag discharge pipe.

[0020] Stp5. Discharge the sewage into the tank B through the drain pipe, and filter it successively through the first filtering plate, the second filtering plate and the third filtering plate.

[0021] Stp6. When it is necessary to clean and discharge the filter material in the filtering structure, wait until it is detected that the liquid level in the tank B is lower than the bottommost filtering structure, and then control the telescopic motor to contract, so as to control the sealing plate to disengage from the filter discharge pipe.

[0022] The present invention has the following beneficial effects:

[0023] Through the setting of the scum cleaning unit, the present invention realizes the cleaning of scum by controlling the change of the liquid level in the tank A during use; through the setting of the towing rope, the floating block B and the top plate, the lifting of the blocking block is controlled by using the change of the liquid level height in the tank A1, and through the setting of the floating block A, the lifting of the closing plate is controlled by using the change of the liquid level height in the tank A.

[0024] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the plasticizer wastewater treatment system of the present invention;

[0027] Figure 2 is Figure 1 front view of;

[0028] Figure 3 It is a schematic structural diagram of the scum cleaning unit of the present invention;

[0029] Figure 4 is Figure 3 top view of;

[0030] Figure 5 is Figure 3 front view of;

[0031] Figure 6 is Figure 4 or Figure 5 cross-sectional view taken along line A-A in;

[0032] Figure 7 It is a schematic structural diagram of the filtering unit of the present invention;

[0033] Figure 8 is Figure 7 front view of;

[0034] Figure 9 isFigure 8 Cross-sectional view taken along line A-A in the middle Specific implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0037] Please refer to Figure 1-2 As shown, the present invention is a plasticizer wastewater treatment system, which includes a scum cleaning unit 1a, a filtration unit 2a, a chemical adjustment unit 3a, and a biological treatment unit 4a arranged in sequence from top to bottom;

[0038] In the present invention, the plasticizer wastewater is first introduced into the scum cleaning unit 1a to remove the scum such as raw materials contained in the plasticizer wastewater; then the wastewater is introduced into the filtration unit 2a to filter out the non-floating solid waste therein; then it is introduced into the chemical adjustment unit 3a to adjust the pH to adapt to the growth of the corresponding treatment microorganisms; finally, it is introduced into the biological treatment unit 4a, and at the same time, a microbial treatment agent is added to the biological treatment unit 4a for treatment.

[0039] Such as Figure 3-6 , the scum cleaning unit 1a of the present invention includes a tank body A1. A pair of porous plates A12 in a "V" shape are arranged between a pair of opposite inner side walls of the tank body A1. A pair of porous plates B13 in an inverted "V" shape are also arranged between a pair of opposite inner side walls of the tank body A1 on both sides of the two porous plates A12; a bottom plate 131 is connected between the bottom ends of the porous plates B13 and the bottom ends of the porous plates A12. At least one slag discharge pipe 132 is communicated with the bottom plate 131, and the slag discharge pipe 132 penetrates through the bottom side surface of the tank body A1; a water inlet pipe 11 is also penetrated through the bottom side surface of the tank body A1 between the two porous plates A12, and the top of the water inlet pipe 11 extends to the middle position of the porous plate A12; a drain pipe 15 is penetrated through the tank body A1 outside the porous plate A12; an air flotation port 121 is formed between the two porous plates A12, and a closing plate 122 is arranged on the air flotation port 121; at the same time, a spray pipe for cleaning the scum between the porous plates B13 and the porous plates A12 is arranged in the tank body A1.

[0040] Based on the above, as Figure 4-6 , connection columns 123 can be respectively connected to both ends of the closing plate 122. Cross bars 124 are respectively connected to the tops of the connection columns 123. Floating blocks A 126 are respectively connected to both ends of the cross bars 124 through suspension rods 125. In the present invention, through the arrangement of the floating blocks A 126, the lifting of the closing plate 122 is controlled by utilizing the change of the liquid level height in the tank body A1.

[0041] Based on the above, as Figure 4-6 , a longitudinal beam 130 is connected between two opposite inner side walls of the tank body A1 directly above the bottom plate 131. A movable rod 1341 that matches the number of slag discharge pipes 132 is movably penetrated through the longitudinal beam 130. A blocking block 133 that cooperates to block the slag discharge pipe 132 is arranged at the bottom end of the movable rod 1341. The top of the movable rod 1341 is connected to a top plate 134; a longitudinal rod 14 is connected between two opposite inner side walls of the tank body A1. At least two pulleys 141 are arranged along the length direction on the outer side of the longitudinal rod 14, and the porous plate B13 is located between the longitudinal beam 130 and the longitudinal rod 14; a traction rope 135 is connected to the top plate 134. The end of the traction rope 135 is connected to a floating block B 136. The traction rope 135 passes through the pulley 141; in the present invention, through the arrangement of the traction rope 135, the floating block B 136, the top plate 134, etc., the lifting of the blocking block 133 is controlled by utilizing the change of the liquid level height in the tank body A1.

[0042] There are also two guide rods B 137 that movably penetrate through the floating block B 136 and whose bottoms are fixed on the bottom side surface of the tank body A1, and two guide rods A 127 that movably penetrate through the floating block A 126 and whose bottoms are fixed on the bottom side surface of the tank body A1; through the arrangement of the guide rods A 127 and the guide rods B 137, it is convenient to control the floating block A 126 and the floating block B 136 to change their positions in the vertical direction and not change horizontally when the liquid level in the tank body A1 changes.

[0043] A limiting plate 138 is arranged at the top of the guide rod B 137. At the same time, the arrangement of the limiting plate 138 limits the floating height of the floating block B 136, avoiding the phenomenon that the traction rope 135 detaches from the pulley 141 due to the excessive floating height of the floating block B 136.

[0044] In the present invention, when the liquid level in the tank A1 rises to the first height, the floating block A126 rises, thereby driving the closing plate 122 to disengage from the air flotation port 121; when the liquid level in the tank A1 drops to the second height, the floating block B136 drops, driving the plug 133 to move upward and disengage from the slag discharge pipe 132; the first height is higher than the top of the perforated plate A12, and the second height is lower than the bottom of the perforated plate A12; the top end of the perforated plate B13 is provided with a baffle 139 extending upward, and the baffle 139 is located between the top of the perforated plate A12 and the first height.

[0045] As Figure 7-9 , the filtering unit 2a includes a tank B2, and the tank B2 includes at least two filtering structures from bottom to top; the sizes of the filtering holes of the filtering structures gradually increase from bottom to top; a drain filter pipe 20 is communicated and arranged at the bottom of the filtering structure; a blocking plate 24 for blocking the drain filter pipe 20 is arranged in any one of the filtering structures, the blocking plate 24 is connected with a connecting frame 242 through a connecting rod A241, and a connecting rod B26 penetrating through the filter plate 22 is connected to the peripheral side of the connecting frame 242; a cross beam 25 is arranged at the top of the tank B2, and a connecting frame located at the topmost part is connected to the bottom side of the cross beam 25 through a telescopic motor 251. The tank B2 includes a first filter plate 23, a second filter plate 22 and a third filter plate 21 from bottom to top; the first filter plate 23, the second filter plate 22 and the third filter plate 21 are all in the shape of a conical plate; and a conical drainage part 27 is arranged at the bottom of the tank B2, and the drain filter pipe 20 extends to the outside of the tank B2. Through the arrangement of the first filter plate 23, the second filter plate 22 and the third filter plate 21, three-stage filtering is realized. At the same time, through the arrangement of the telescopic motor 251, the connecting frame, etc., when in use, when it is necessary to clean the filter substances on the filtering structure, controlling the telescopic motor 251 to retract can drive any blocking plate 24 to disengage from the drain filter pipe 20.

[0046] On the above basis, valves A and B are arranged on the water inlet pipe 11 and the drain pipe 15, a liquid level sensor A is arranged in the tank A1, and a liquid level sensor B is arranged in the tank B2; a controller is further included, and the controller is connected to the valve A, the valve B, the liquid level sensor B, the liquid level sensor A and the telescopic motor 251. Through the arrangement of the controller, intelligent automatic control is realized in the whole process.

[0047] Based on the above plasticizer wastewater treatment system, the plasticizer wastewater treatment method includes the following steps:

[0048] Stp1. Discharge the plasticizer wastewater into the tank A1 through the water inlet pipe 11;

[0049] Stp2. After a period of time, close valve A until the liquid level in tank A1 rises to the first height. At this time, the sealing plate 122 disengages from the air flotation port 121, and then the floating slag flows into the area formed by the perforated plate B13 and the perforated plate A12 through the air flotation port 121.

[0050] Stp3. Open valve A until the liquid level in tank A1 drops to the third height. During the process of the liquid level dropping, the floating slag falls onto the bottom plate 131 between the perforated plate B13 and the perforated plate A12. Then, start the spray pipe to clean the floating slag.

[0051] Stp4. Continue to wait until the liquid level in tank A1 drops to the second height. At this time, the floating block B136 drops and drives the blocking block 133 to move upward, so that the blocking block 133 disengages from the slag discharge pipe 132. Then, the floating slag is discharged from the slag discharge pipe 132.

[0052] Stp5. The sewage is discharged into tank B2 through the drain pipe 15 and is filtered successively by the first filter plate 23, the second filter plate 22, and the third filter plate 21.

[0053] Stp6. When it is necessary to clean and discharge the filter substances in the filtering structure, wait until it is detected that the liquid level in tank B2 is lower than the bottommost filtering structure, and then control the telescopic motor 251 to contract, so as to control the sealing plate 24 to disengage from the filter discharge pipe 20.

[0054] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A plasticizer wastewater treatment system, characterized in that: It includes a scum cleaning unit (1a); The scum cleaning unit (1a) includes a tank A (1). Between a pair of opposite inner side walls of the tank A (1), a pair of porous plates A (12) in a "V" shape are arranged. Between a pair of opposite inner side walls of the tank A (1) on both sides of the two porous plates A (12), a pair of porous plates B (13) in an inverted "V" shape are also arranged; A bottom plate (131) is connected between the bottom ends of the porous plates B (13) and the bottom ends of the porous plates A (12). At least one slag discharge pipe (132) is communicated with the bottom plate (131), and the slag discharge pipe (132) penetrates through the bottom side surface of the tank A (1); A water inlet pipe (11) is also penetrated and arranged on the bottom side surface of the tank A (1) between the two porous plates A (12), and the top of the water inlet pipe (11) extends to the middle position of the porous plate A (12); A drain pipe (15) is penetrated and arranged on the tank A (1) outside the porous plate A (12); An air flotation port (121) is formed between the two porous plates A (12), and a closing plate (122) is arranged on the air flotation port (121); Both ends of the closing plate (122) are respectively connected with a connecting column (123). The top ends of the connecting columns (123) are respectively connected with a cross bar (124). Both ends of the cross bar (124) are respectively connected with a floating block A (126) through a suspension rod (125); The floating block A (126) and the closing plate (122) are lifted and lowered synchronously; Between a pair of opposite inner side walls of the tank A (1) directly above the bottom plate (131), a longitudinal beam (130) is connected. An activity rod (1341) matching the number of the slag discharge pipes (132) is movably penetrated through the longitudinal beam (130). A blocking block (133) for cooperatively blocking the slag discharge pipe (132) is arranged at the bottom end of the activity rod (1341); The top of the activity rod (1341) is connected with a top plate (134). A longitudinal rod (14) is connected between a pair of opposite inner side walls of the tank A (1). At least two pulleys (141) are arranged on the outer side of the longitudinal rod (14) along the length direction; And the porous plate B (13) is located between the longitudinal beam (130) and the longitudinal rod (14); A traction rope (135) is connected to the top plate (134). The end of the traction rope (135) is connected with a floating block B (136), and the traction rope (135) passes through the pulley (141); It also includes a filtering unit (2a). The filtering unit (2a) includes a tank B (2). Inside the tank B (2), there are at least two filtering structures from bottom to top; The sizes of the filtering holes of the filtering structures gradually increase from bottom to top; A drain filter pipe (20) is communicated and arranged at the bottom of the filtering structure; A blocking plate (24) for blocking the drain filter pipe (20) is arranged inside any one of the filtering structures. The blocking plate (24) is connected with a connecting frame (242) through a connecting rod A (241). Connecting rods B (26) penetrating through the filter plate are connected to the periphery of the connecting frame (242); A crossbeam (25) is arranged at the top of the tank body B (2), and a connecting frame at the topmost position is connected to the bottom side surface of the crossbeam (25) through a telescopic motor (251); inside the tank body B (2), from bottom to top, there are a first filter plate (23), a second filter plate (22) and a third filter plate (21); the first filter plate (23), the second filter plate (22) and the third filter plate (21) are all in the shape of a conical plate. And a conical drainage part (27) is arranged at the bottom of the tank body B (2), and the drain and filter pipe (20) extends to the outside of the tank body B (2).

2. The plasticizer wastewater treatment system according to claim 1, characterized in that, It also includes at least two guide rods A (127) that movably penetrate through the floating block A (126) and whose bottom is fixed to the bottom side surface of the tank body A (1).

3. The plasticizer wastewater treatment system according to claim 1, wherein It also includes at least two guide rods B (137) that movably penetrate through the floating block B (136) and whose bottom is fixed to the bottom side surface of the tank body A (1), and a limiting plate (138) is arranged at the top of the guide rod B (137).

4. The plasticizer wastewater treatment system according to claim 3, characterized in that, When the liquid level in the tank body A (1) rises to the first height, the floating block A (126) rises, thereby driving the closing plate (122) to disengage from the air flotation port (121). When the liquid level in the tank body A (1) drops to the second height, the floating block B (136) drops, driving the plug block (133) to move upward and disengage from the slag discharge pipe (132). The first height is higher than the top of the perforated plate A (12), and the second height is lower than the bottom of the perforated plate A (12).

5. The plasticizer wastewater treatment system according to claim 1, characterized in that, Valve A and valve B are arranged on the water inlet pipe (11) and the drain pipe (15), a liquid level sensor A is arranged inside the tank body A (1), and a liquid level sensor B is arranged inside the tank body B (2). It also includes a controller, and the controller is connected to valve A, valve B, liquid level sensor B, liquid level sensor A and the telescopic motor (251).

6. The plasticizer wastewater treatment system according to claim 5, characterized in that, It also includes a chemical regulation unit (3a) and a biological treatment unit (4a); the scum cleaning unit (1a), the filtration unit (2a), the chemical regulation unit (3a) and the biological treatment unit (4a) are arranged in sequence from top to bottom; a spray pipe for cleaning the scum between the perforated plate B (13) and the perforated plate A (12) is arranged inside the tank body A (1).

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