Stainless steel production pickling wastewater treatment system and treatment process thereof

Abstract

The invention discloses a stainless steel production pickling wastewater treatment system and a treatment process thereof. The treatment system comprises a filter bin, a neutralization mechanism, a coagulation mechanism and an activated carbon adsorption mechanism which are sequentially arranged, the pickling wastewater is preliminarily filtered by the filter bin, then enters the neutralization mechanism for acid-base neutralization and then enters the coagulation mechanism for flocculation and sedimentation, finally, the wastewater is discharged, and sludge is dewatered and transferred; the method comprises the following specific process steps: 1) preliminary filtration in a filter bin; 2) neutralization treatment by a neutralization mechanism; 3) flocculation treatment by a coagulation mechanism; 4) activated carbon adsorption treatment; and 5) post-treatment of wastewater and sludge. Through filtering treatment in the filtering bin, impurities in wastewater can be preliminarily filtered and screened out to a large extent, meanwhile, the blocking condition can be treated in time, neutralization treatment is conducted through the neutralization mechanism, the pH value of the wastewater is reduced, and rapid and uniform stirring of upper and lower water bodies can be achieved during neutralization; and the final purification effect of the wastewater is realized by cooperating with subsequent activated carbon adsorption.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel pickling wastewater, and in particular relates to a stainless steel production pickling wastewater treatment system and a treatment process thereof. Background Art

[0002] Stainless steel needs to go through many processes during production and processing, including pickling process. Pickling is a process for treating impurities and debris such as scale on the surface of stainless steel. Therefore, the acidic wastewater after pickling also contains metal ions and oxide slag. Therefore, the wastewater after pickling needs to be treated before discharge. Most of the treatments for acidic wastewater use alkaline neutralizers to neutralize the acidity and then remove impurities in the wastewater, including flocculation treatment, precipitation treatment, etc.

[0003] After searching, a stainless steel pickling wastewater treatment process and a stainless steel pickling wastewater treatment system with publication number CN117865416A provide a specific process for pickling wastewater treatment, which includes the following steps: including multi-stage wastewater mixing precipitation and ammonia stripping steps;

[0004] Furthermore, the publication number is CN113321343A, a stainless steel strip processing line pickling wastewater treatment device and a treatment method thereof, comprising a collection box, a sedimentation box and a pasteurization box, wherein a water inlet is arranged on one side of the collection box, a coarse grid is arranged on the upper part of the collection box, a fine grid is arranged below the coarse grid, and a support shaft is arranged in the middle of the collection box; however, in this scheme, when blockage occurs after long-term filtration, the accumulated blockage cannot be cleaned up in time and effectively, so that the purpose of reducing blockage by only performing preliminary cleaning cannot be achieved, and it can only be replaced after shutdown, which affects the wastewater treatment process;

[0005] Furthermore, a stainless steel pickling wastewater treatment equipment with announcement number CN217650926U is disclosed. This solution aims to solve the problem in the prior art that the wastewater treatment device can only release chemicals into fixed points inside the treatment device, causing the chemicals and wastewater to be difficult to mix. However, combined with the attached drawings, it can be clearly seen that during the mixing and stirring process, the exchange efficiency and effect between the upper and lower layers of water bodies are low, and the mixing effect is only concentrated in the upper and lower peripheral areas of the stirring blades. There is a lack of interference with the upper layer of the water body, and the overall stirring and mixing effect of the upper and lower layers of water bodies is poor. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a stainless steel production pickling wastewater treatment system and a treatment process thereof. The wastewater can be filtered and screened to a large extent through the filtration treatment in the filter bin, and the blockage can be dealt with in time. Then, the pH value of the wastewater is reduced by neutralization treatment through the neutralization mechanism. During neutralization, rapid and uniform stirring of the upper and lower water bodies can be achieved, and the subsequent activated carbon adsorption is combined to achieve the final treatment and purification effect of the wastewater.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A stainless steel production pickling wastewater treatment system treatment process, the specific steps are as follows:

[0009] 1) Preliminary filtration in the filter chamber: wastewater enters the filter chamber along the pipe head through the first water inlet pipe, and the larger debris in the pickling wastewater is preliminarily filtered through the filter plate; during the filtration process, the adjustment plate can be driven by the first motor to rotate around the first rotating shaft, so that the adjustment plate pushes the filter plate for alternate use; wherein, the aperture of the filter plate is 2-3mm, and the interval between the two pairs of filter plates is 1.5-2h under the condition of continuous and uninterrupted water filtration, the speed of the first motor is 80r / min, and the adjustment plate is rotated and the filter plate is pushed alternately within 30-35s through the coupling and the reducer;

[0010] The angle between the installed filter plate and the side wall of the filter chamber is 45-55°, and the optimal angle is 50°;

[0011] The pipe head completes the conversion in 8-10 seconds so that the wastewater can flush the alternating filter plates;

[0012] 2) Neutralization treatment by neutralization mechanism: The acidic wastewater after preliminary filtration enters the neutralization tank through the second water inlet pipe; then, an alkaline neutralizer is added, and sodium hydroxide is used as the neutralizer, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 40-50 r / min; the mixing time is set to 20-30min, and after mixing and neutralization, it is left to stand for 8-10min to allow the impurities to partially settle; then, the pH value is monitored by a monitor, and if it meets the requirements, it enters the next treatment process;

[0013] 3) Flocculation treatment by coagulation mechanism: fine impurities in wastewater are flocculated and precipitated by adding flocculants into the coagulation mechanism; the coagulation tank adopts the conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 50-200 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing;

[0014] The mixing time is 20-25 minutes, and then it is left to stand for 5 minutes.

[0015] The second stage mixing time is 15-25 minutes, and the standing time is 5-10 minutes.

[0016] The three-stage mixing time is 10-15 minutes. After the three-stage mixing and stirring is completed, it is left to stand until the precipitation is completed; the standing treatment is to give the flocculant enough time to combine with the fine impurities in the wastewater;

[0017] 4) Activated carbon adsorption treatment: The wastewater after coagulation treatment is sucked into the activated carbon adsorption mechanism for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank combined with an activated carbon adsorption plate filtration adsorption scheme. The activated carbon adsorption plate is composed of filled activated carbon particles. This scheme is a conventional existing technology; the particle size of the granular activated carbon is 0.5-2.55mm; the bulk density of the activated carbon particles is 0.4-0.5g / cm 3 ; The thickness of the activated carbon adsorption plate is 50-90mm; The activated carbon adsorption plate is regenerated using high-temperature steam at 800-950℃;

[0018] 5) Post-treatment of wastewater and sludge: qualified wastewater enters the discharge procedure and is discharged in sequence, and then the sediment in the coagulation and sedimentation and neutralization tanks is dehydrated;

[0019] A stainless steel production pickling wastewater treatment system comprises a filtering chamber, a neutralizing mechanism, a coagulating mechanism and an activated carbon adsorption mechanism which are arranged in sequence; the pickling wastewater is initially filtered through the filtering chamber, then enters the neutralizing mechanism for acid-base neutralization, then enters the coagulating mechanism for flocculation and precipitation, and finally the wastewater is discharged and the sludge is dehydrated and transferred.

[0020] The inner wall of the filter bin is provided with a first guide groove and a second guide groove, an adjusting plate is provided in the filter bin, first rotating shafts are provided on both sides of the bottom of the adjusting plate, the first rotating shaft is rotatably connected to the side walls of the filter bin, a first worm gear is provided on the first rotating shaft, a first motor fixed by a motor seat is provided on the outer wall of the filter bin, a first worm gear fixed by a bearing seat is provided on the shaft end of the first motor, the first worm gear meshes with the first worm gear, a first discharge port that can be opened and closed is provided on both side walls of the filter bin, symmetrical filter plates are provided on both sides of the adjusting plate, a limiting shaft and a second rotating shaft are provided on the filter plate, a guide plate is provided below the filter plate for receiving missed filtered materials, the guide plate is aligned with the first discharge port; the filter plate is aligned with the first discharge port; the second rotating shaft is provided in the first guide groove, the limiting shaft is provided in the second guide groove, the filter plate enables the second rotating shaft and the limiting shaft to slide in the first guide groove to complete the installation, the filter plate can rotate with the second rotating shaft as the axis, the second guide groove is set in an arc shape and takes the second rotating shaft on the filter plate after installation as the axis, so that the limiting shaft can slide in the second guide groove.

[0021] A mounting plate is provided on the side wall of the filter bin, the mounting plate is provided with a fixed first water inlet pipe, the first water inlet pipe is provided with a pipe head connected by a rotating joint, and teeth are provided on the outer wall circumference of the pipe head; a third motor is provided on the mounting plate; a gear is provided on the output shaft of the third motor and meshes with the teeth on the outer wall of the pipe head; the pipe head is driven to rotate by the third motor so that the pipe head is aligned with the filter plate; a drain pipe is provided at the bottom of the filter bin.

[0022] When the filter bin initially filters larger debris in the wastewater, the wastewater enters through the first water inlet pipe and flushes the filter plate along the pipe head. When a lot of debris is accumulated on the filter plate, the first motor drives the first worm to rotate, and then drives the first worm gear to rotate, so that the adjusting plate rotates with the first rotating shaft as the axis, and pushes the filter plate with accumulated debris to rotate and rise with the second rotating shaft as the axis, and accompanied by the opening of the first discharge port, the debris on the filter plate is discharged along the first discharge port. At this time, when the adjusting plate pushes the filter plate on one side, the filter plate on the other side will slide along the second guide groove due to its own gravity until it stops, and the third motor drives the pipe head to rotate so that the pipe head is aligned with the opened filter plate and then water is released for filtration; further, when the filter plate is seriously blocked, the filter plate can be pushed until the limit shaft and the second rotating shaft are synchronously located in the first guide groove, and then the filter plate can be vertically pulled out for quick replacement.

[0023] The neutralization mechanism includes a neutralization tank, a main shaft, a second motor, a control mechanism, an adjusting mechanism, and a stirring mechanism; the control mechanism is provided with a pair and is symmetrically arranged on both sides of the neutralization tank, the main shaft is arranged inside the neutralization tank and is rotatably connected to each other, the second motor is arranged at the top of the neutralization tank and fixed through the motor seat, and the output shaft of the second motor is connected to the top of the main shaft; the adjusting mechanism is arranged at the top of the neutralization tank and connected to the control mechanism; the stirring mechanism is provided with a pair and is arranged on the main shaft; the second motor provides power to drive the adjusting mechanism and the control mechanism to operate, and then controls the stirring mechanism to stir and accelerate the neutralization effect; a feeding pipe, a water pumping pipe, and a second water inlet pipe are also provided on the top of the neutralization tank; the feeding pipe is used to add a neutralizer, the second water inlet pipe is connected to the drain pipe for water inlet, the water pumping pipe is close to the inner wall of the neutralization tank and the pipe mouth can adjust the depth up and down to pump water into the next treatment process section.

[0024] A conical platform and a second discharge port that can be opened and closed are provided at the bottom of the neutralization tank. The main shaft is rotatably connected to the top wall of the neutralization tank and the conical platform. A mounting groove is provided on the main shaft. The main shaft is composed of two pairs of semi-cylinders and fixed with bolts. A bevel gear is provided on the top of the main shaft. A monitor for pH value monitoring is provided on the side wall of the neutralization tank.

[0025] The control mechanism includes an installation bin, a first wedge block, a second wedge block, a top shaft, and a first spring, wherein the installation bin is fixed to the side wall of the neutralization tank, and a first through slot is provided on the installation bin; the first wedge block and the second wedge block are arranged up and down and fixedly connected through a connecting plate, a limit block is provided on the connecting plate, and the limit block is arranged in the first through slot for limiting; the wedge surfaces of the first wedge block and the second wedge block are arranged oppositely, the wedge surface of the first wedge block faces the side wall of the neutralization tank, and the second wedge block is provided with a second through slot for avoiding the top shaft; the first wedge block is provided with a fixing rod, and the fixing rod is slidably connected to the top wall of the installation bin; the top shaft is provided with a pair of and respectively The first wedge block and the second wedge block should be connected; the top shaft passes through the side wall of the neutralization tank and is slidably connected, and a ball head is provided on the top shaft, and the ball head touches the wedge surfaces of the first wedge block and the second wedge block; one end of the top shaft at the second wedge block also passes through the side wall of the installation bin and is slidably connected; the first spring is sleeved on the top shaft, and the first spring on the top shaft corresponding to the first wedge block touches the side wall of the neutralization tank and the ball head, and the first spring on the top shaft corresponding to the second wedge block touches the ball head and the side wall of the installation bin; by setting the contact position of the first spring, the sliding directions of the top shaft at the first wedge block and the top shaft at the second wedge block are opposite when they move at the same time.

[0026] The adjusting mechanism comprises a power shaft, a first adjusting arm, a first connecting rod, a third rotating shaft and a fixed plate; a pair of the fixed plates are provided and fixed on the top of the neutralization tank, two ends of the power shaft are rotatably connected to the fixed plates, a sprocket is provided on the power shaft, a pair of the first adjusting arms are provided and are respectively fixed at two ends of the power shaft, one end of the first connecting rod is hinged to the end of the first adjusting arm, and the other end of the first connecting rod is hinged to the end of the fixed rod; the third rotating shaft is rotatably connected to the motor seat and the fixed plate, a bevel gear is provided on the third rotating shaft and meshes with the bevel gear on the main shaft, a sprocket is also provided on the third rotating shaft and is connected to the sprocket on the power shaft through a chain; the third rotating shaft is driven to rotate by the second motor, thereby driving the power shaft to rotate, thereby utilizing the first connecting rod to drive the control mechanism to operate.

[0027] The stirring mechanism includes a first fixed shaft, a mounting block, a second fixed shaft, and an arc arm; the mounting block is provided with a pair of and plugged into the first fixed shaft, the mounting block is slidably connected to the first fixed shaft, the mounting block and the first fixed shaft are arranged in a mounting groove, the first fixed shaft is fixedly connected to the main shaft, a sleeved second spring is provided on the first fixed shaft, and the second spring touches the mounting block, and a fixedly connected second fixed shaft is provided at both ends of the mounting block, and a rotatably connected first fan plate and a second fan plate are provided on the second fixed shaft; a cross bar is also provided on the second fixed shaft, and the cross bar is arranged between the first fan plate and the second fan plate, and the arc arm is provided with a pair of and symmetrically arranged arc arms, the arc arm is arranged between the mounting blocks, and a hinged second connecting rod is provided on the arc arm, and one end of the second connecting rod is hinged to the end of the cross bar; the arc arm pushes the top shaft; the top shaft is controlled to be ejected by the control mechanism and then the arc arm is pushed to move by the top shaft, and then the second fixed shaft is pushed up and down along the first fixed shaft in cooperation with the second connecting rod.

[0028] Furthermore, the second fan plate is simultaneously slidably connected and rotationally connected to the second fixed shaft, and one side of the second fan plate is provided with a third spring that is sleeved on the second fixed shaft and a limit plate fixed to the end of the second fixed shaft by bolts; the third spring contacts the limit plate and the second fan plate, pushing the second fan plate to slide on the second fixed shaft.

[0029] Furthermore, the arc-shaped arm section is provided with a guide block, and the maximum distance that one end of the top shaft extends into the neutralization tank is enough to touch the guide block. When the stirring mechanism rotates following the main shaft, the top shaft can smoothly slide and touch the side wall of the arc-shaped arm through the touch of the guide block after separating from the arc-shaped arm.

[0030] Furthermore, a circular plate is provided on one side of the second fan plate for contacting the third spring to receive the spring thrust.

[0031] Furthermore, a lever is provided at the bottom of the main shaft, and the lever is arranged in an arc shape. When the main shaft rotates, the debris settled at the bottom of the neutralization tank is agitated through the convex arc surface on the lever, and finally discharged at the second discharge port.

[0032] Furthermore, a top block is provided at the end of the top shaft to increase the top contact area between the top shaft and the arc-shaped arm, which can effectively ensure smooth contact between the top shaft and the arc-shaped arm.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) In this scheme, a filter chamber for preliminary filtering of wastewater is provided. Wastewater enters through the first water inlet pipe and flushes the filter plate along the pipe head. When a lot of debris is accumulated on the filter plate, the first motor drives the first worm to rotate, and then drives the first worm wheel to rotate, so that the adjustment plate rotates with the first rotating shaft as the axis, and the filter plate with accumulated debris is pushed to rotate and rise with the second rotating shaft as the axis, and the first discharge port is opened, so that the debris on the filter plate is discharged along the first discharge port. Such repeated operations can discharge the debris on the filter plate without frequent replacement of the filter plate, maintain the continuous use of the filter plate, and reduce the clogging of debris. At the same time, the inclined filter plate is also conducive to the accumulation of filtered debris at the bottom of the filter plate during filtering and reduces the clogging of the water receiving part of the filter plate;

[0035] Furthermore, when the adjusting plate pushes the filter plate on one side, the filter plate on the other side will slide along the second guide groove due to its own gravity until it stops, and the third motor can drive the pipe head to rotate so that the pipe head is aligned with the opened filter plate and then release water for filtering; the filter plates can be used alternately quickly to maintain the continuous filtering effect of wastewater; further, when the filter plate is seriously clogged, the filter plate can be pushed until the limit shaft and the second rotating shaft are synchronously located in the first guide groove, and then the filter plate can be vertically pulled out for rapid replacement to ensure filtering efficiency;

[0036] 2) In the neutralization mechanism, the control mechanism cooperates with the adjustment mechanism to drive the stirring mechanism to stir the wastewater and the neutralizer, thereby accelerating the mixing process; the power shaft in the adjustment mechanism drives the first wedge block and the second wedge block in the control mechanism to move back and forth up and down in the installation bin, thereby pushing the top shaft to push out and retreat back and forth in the neutralization tank, thereby pushing the arc arm and cooperating with the thrust of the second spring to make the arc arm move back and forth, and the reciprocating movement of the arc arm can pull the second fixed shaft to move back and forth up and down in the installation groove through the second connecting rod, and finally drive the first fan plate and the second fan plate to move back and forth up and down in the neutralization tank, so that the stirring area and position of the first fan plate and the second fan plate constantly change up and down, realizing a mixing mechanism with position differences in the upper and lower areas, thereby causing the stirring of the upper and lower position areas to alternately mix rapidly and relatively slow down, which can provide sufficient time for the neutralization reaction in the case of slowing mixing, and can improve the mixing efficiency of the mixing of the neutralizer and the wastewater in the case of accelerating mixing, and the combination of the two can ultimately improve the neutralization rate;

[0037] 3) The second fan plate can also slide and rotate on the second fixed shaft, and with the push of the third spring and the centrifugal force generated when the main shaft rotates, it can not only rotate on the second fixed shaft but also slide, thereby changing the stirring area by sliding during the rotating stirring process, increasing the stirring and mixing area of ​​the first fan plate and the second fan plate in the neutralization tank, and improving the stirring and mixing effect and rate; further, the flocculation treatment of the coagulation mechanism uses a three-stage intermittent mixing and stirring method to mix the flocculant and the wastewater, and there is a static treatment time period of different lengths between each mixing stage, which can give the flocculant and the fine impurities in the wastewater sufficient time to combine. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Attached Figure 1 This is a stainless steel production pickling wastewater treatment system and its treatment process flow chart of the present invention;

[0039] Attached Figure 2 This is the structure diagram of the filter chamber Figure 1 ;

[0040] Attached Figure 3 This is the structure diagram of the filter chamber Figure 2 ;

[0041] Attached Figure 4 This is the structure diagram of the filter chamber Figure 3 ;

[0042] Attached Figure 5 It is a schematic diagram of the neutralization mechanism structure Figure 1 ;

[0043] Attached Figure 6 It is a schematic diagram of the neutralization mechanism structure Figure 2 ;

[0044] Attached Figure 7 This is a schematic diagram of the internal structure of the neutralization tank. Figure 1 ;

[0045] Attached Figure 8 This is a schematic diagram of the internal structure of the neutralization tank. Figure 2 ;

[0046] Attached Fig. 9 This is a schematic diagram of the structure of the stirring mechanism. Figure 1 ;

[0047] Attached Fig.10 This is a schematic diagram of the structure of the stirring mechanism. Figure 2 ;

[0048] Attached Fig.11 It is a structural diagram of the top shaft;

[0049] In the figure: 1, filter bin; 11, first guide groove; 12, second guide groove; 13, first discharge port; 131, guide plate; 14, adjustment plate; 141, first rotating shaft; 142, first worm gear; 15, first motor; 151, first worm; 16, filter plate; 161, limit shaft; 162, second rotating shaft; 17, first water inlet pipe; 18, pipe head; 181, teeth; 19, third motor; 191, mounting plate; 101, drain pipe;

[0050] 2. Neutralization mechanism; 21. Neutralization tank; 211. Second discharge port; 212. Cone-shaped platform; 22. Main shaft; 221. Mounting groove; 222. Push rod; 23. Second motor;

[0051] 24, control mechanism; 241, mounting chamber; 2411, first through slot; 242, first wedge block; 2421, connecting plate; 2422, limit block; 2423, fixing rod; 243, second wedge block; 2431, second through slot; 244, top shaft; 2441, ball head; 245, first spring; 246, top block;

[0052] 25. Adjustment mechanism; 251. Power shaft; 252. First adjustment arm; 253. First connecting rod; 254. Third rotating shaft; 255. Fixed plate;

[0053] 26, stirring mechanism; 261, first fixed shaft; 2611, second spring; 262, mounting block; 263, second fixed shaft; 2631, first fan plate; 2632, second fan plate; 26321, circular plate; 2633, cross bar; 2635, third spring; 2636, limit plate; 264, arc arm; 2641, second connecting rod; 2642, guide block;

[0054] 3. Water suction pipe; 4. Feeding pipe; 5. Second water inlet pipe; 6. Monitoring instrument. DETAILED DESCRIPTION

[0055] To facilitate the understanding of those skilled in the art, Figure 1-11 , the technical solution of the present invention is further specifically described.

[0056] Embodiment 1:

[0057] The specific steps of the treatment process are as follows:

[0058] 1) Preliminary filtration in the filter chamber: wastewater enters the filter chamber along the pipe head through the first water inlet pipe, and the larger debris in the pickling wastewater is preliminarily filtered through the filter plate; during the filtration process, the adjustment plate can be driven by the first motor to rotate around the first shaft, so that the adjustment plate pushes the filter plate for alternate use; wherein, the filter plate aperture is 2mm, and the interval between the two pairs of filter plates is 1.5 under the condition of continuous and uninterrupted water filtration, the first motor speed is 80r / min, and the adjustment plate is rotated within 30s through the coupling and the reducer, and the filter plate is alternately pushed;

[0059] The angle between the installed filter plate and the side wall of the filter bin is 50°;

[0060] The pipe head is switched within 8 seconds so that the wastewater can flush the filter plates after alternation;

[0061] 2) Neutralization treatment by neutralization mechanism: The acidic wastewater after preliminary filtration enters the neutralization tank through the second water inlet pipe; then the alkaline neutralizer is added, and sodium hydroxide is used as the neutralizer, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 40 r / min; the mixing time is set to 20min, and after mixing and neutralization, it is left to stand for 8min to allow the impurities to partially settle; then the pH value is monitored by the monitor, and it enters the next treatment process after meeting the requirements;

[0062] 3) Flocculation treatment by coagulation mechanism: fine impurities in wastewater are flocculated and precipitated by adding flocculants in the coagulation mechanism; the coagulation tank adopts the conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 50mg / L, and an intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing;

[0063] The mixing time is 20 minutes, and then it is left to stand for 5 minutes.

[0064] The second stage mixing time is 15min, the standing time is min,

[0065] The three-stage mixing time is 10 minutes. After the three-stage mixing and stirring is completed, it is left to stand until the precipitation is completed; the standing treatment is to give the flocculant enough time to combine with the fine impurities in the wastewater;

[0066] 4) Activated carbon adsorption treatment: The wastewater after coagulation treatment is sucked into the activated carbon adsorption mechanism for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank combined with an activated carbon adsorption plate for filtration and adsorption. The activated carbon adsorption plate is composed of filled activated carbon particles. This scheme is a conventional existing technology; the particle size of the granular activated carbon is 0.5mm; the bulk density of the activated carbon particles is 0.4g / cm 3 ; The thickness of the activated carbon adsorption plate is 50mm; The activated carbon adsorption plate is regenerated using 800℃ high temperature steam;

[0067] 5) Post-treatment of wastewater and sludge: Qualified wastewater enters the discharge procedure and is discharged in sequence, and then the coagulation and sedimentation, and the sediment in the neutralization tank is dehydrated.

[0068] A stainless steel production pickling wastewater treatment system comprises a filter chamber 1, a neutralization mechanism 2, a coagulation mechanism, and an activated carbon adsorption mechanism which are arranged in sequence; the pickling wastewater is preliminarily filtered through the filter chamber 1, then enters the neutralization mechanism 2 for acid-base neutralization, and then enters the coagulation mechanism for flocculation and precipitation, and finally the wastewater is discharged and the sludge is dehydrated and transferred.

[0069] The inner wall of the filter bin 1 is provided with a first guide groove 11 and a second guide groove 12, an adjusting plate 14 is provided in the filter bin 1, first rotating shafts 141 are provided at both sides of the bottom of the adjusting plate 14, the first rotating shaft 141 is rotatably connected to the side wall of the filter bin 1, a first worm gear 142 is provided on the first rotating shaft 141, a first motor 15 fixed by a motor seat is provided on the outer wall of the filter bin 1, a first worm 151 fixed by a bearing seat is provided at the shaft end of the first motor 15, the first worm 151 meshes with the first worm gear 142, first discharge ports 13 that can be opened and closed are provided on both side walls of the filter bin 1, and filter plates 16 arranged symmetrically are provided on both sides of the adjusting plate 14. A limit shaft 161 and a second rotating shaft 162 are provided on the filter plate 16, and a guide plate 131 is provided below the filter plate 16 for receiving missed filtered materials, and the guide plate 131 is aligned with the first discharge port 13; the filter plate 16 is aligned with the first discharge port 13; the second rotating shaft 162 is arranged in the first guide groove 11, and the limit shaft 161 is arranged in the second guide groove 12. The filter plate enables the second rotating shaft and the limit shaft to slide in the first guide groove to complete the installation, and the filter plate can rotate with the second rotating shaft as the axis. The second guide groove is set to an arc shape and takes the second rotating shaft on the filter plate after installation as the axis, so that the limit shaft can slide in the second guide groove.

[0070] A mounting plate 191 is provided on the side wall of the filter bin 1, and the mounting plate 191 is provided with a fixed first water inlet pipe 17, and the first water inlet pipe 17 is provided with a pipe head 18 connected by a rotating joint, and teeth 181 are provided on the outer wall circumference of the pipe head 18; a third motor 19 is provided on the mounting plate 191; a gear is provided on the output shaft of the third motor 19 and meshes with the teeth 181 on the outer wall of the pipe head 18; the pipe head 18 is driven by the third motor 19 to rotate so that the pipe head 18 is aligned with the filter plate 16; a drain pipe 101 is provided at the bottom of the filter bin 1.

[0071] When the filter chamber 1 initially filters larger debris in the wastewater, the wastewater enters through the first water inlet pipe 17 and flushes the filter plate 16 along the pipe head 18. When more debris is accumulated on the filter plate 16, the first motor 15 drives the first worm 151 to rotate, and then drives the first worm wheel 142 to rotate, so that the adjustment plate 14 rotates with the first rotating shaft 141 as the axis, and the filter plate 16 with accumulated debris is pushed to rotate and rise with the second rotating shaft 162 as the axis, and the limit shaft slides in the second guide groove, and the first discharge port 13 is opened, so that the debris on the filter plate 16 is discharged along the second rotating shaft 162. The water is discharged through a discharge port 13. At this time, when the adjustment plate 14 pushes the filter plate 16 on one side, the filter plate 16 on the other side will slide along the second guide groove 12 due to its own gravity until it stops, and the third motor 19 drives the pipe head 18 to rotate so that the pipe head 18 is aligned with the opened filter plate 16 and then the water is released for filtering; further, when the filter plate 16 is seriously clogged, the filter plate 16 can be pushed until the limit shaft 161 and the second rotating shaft 162 are synchronously located in the first guide groove 11, and then the filter plate 16 is vertically pulled out for quick replacement.

[0072] The neutralization mechanism 2 includes a neutralization tank 21, a main shaft 22, a second motor 23, a control mechanism 24, an adjustment mechanism 25, and a stirring mechanism 26; the control mechanism 24 is provided with a pair and is symmetrically arranged on both sides of the neutralization tank 21, the main shaft 22 is arranged inside the neutralization tank 21 and is rotatably connected to each other, the second motor 23 is arranged at the top of the neutralization tank 21 and is fixed by a motor seat, and the output shaft of the second motor 23 is connected to the top of the main shaft 22; the adjustment mechanism 25 is arranged at the top of the neutralization tank 21 and is connected to the control mechanism 24; the stirring mechanism 26 is provided with a pair and is arranged on the main shaft 22; the second motor 23 provides power to drive the adjustment mechanism 25 and the control mechanism 24 to operate, and then controls the stirring mechanism 26 to stir and accelerate the neutralization effect; the top of the neutralization tank 21 is also provided with a feeding pipe 4, a water pumping pipe 3, and a second water inlet pipe 5; the feeding pipe 4 is used to add a neutralizer, the second water inlet pipe 5 is connected to the drain pipe 101 for water inlet, the water pumping pipe 3 is close to the inner wall of the neutralization tank 21 and the pipe mouth can adjust the depth up and down to pump water into the next treatment process section.

[0073] A conical platform 212 and a second discharge port 211 that can be opened and closed are provided at the bottom of the neutralization tank 21. The main shaft 22 is rotatably connected to the top wall of the neutralization tank 21 and the conical platform 212. A mounting groove 221 is provided on the main shaft 22. The main shaft 22 is composed of two pairs of semi-cylinders and fixed with bolts. A bevel gear is provided on the top of the main shaft 22. A monitor 6 for pH value monitoring is provided on the side wall of the neutralization tank 21. This monitor 6 is purchased from the market and its model is PHS-3C.

[0074] The control mechanism 24 includes an installation bin 241, a first wedge block 242, a second wedge block 243, a top shaft 244, and a first spring 245. The installation bin 241 is fixed on the side wall of the neutralization tank 21, and a first through groove 2411 is provided on the installation bin 241; the first wedge block 242 and the second wedge block 243 are arranged up and down and fixedly connected through a connecting plate 2421, and a limit block 2422 is provided on the connecting plate 2421, and the limit block 2422 is arranged in the first through groove 2411 for limiting; the wedge surfaces of the first wedge block 242 and the second wedge block 243 are arranged opposite to each other, and the wedge surface of the first wedge block 242 faces the side wall of the neutralization tank 21, and the second wedge block 243 is provided with a second through groove 2431 for avoiding the top shaft 244; the first wedge block 242 is provided with a fixing rod 2423, and the fixing rod 2423 is slidably connected to the top wall of the installation bin 241; the top shaft 244 is provided with a pair of and They correspond to the first wedge block 242 and the second wedge block 243 respectively; the top shaft 244 passes through the side wall of the neutralization tank 21 and is slidably connected, and a ball head 2441 is provided on the top shaft 244, and the ball head 2441 touches the wedge surfaces of the first wedge block 242 and the second wedge block 243; one end of the top shaft 244 at the second wedge block 243 also passes through the side wall of the installation bin 241 and is slidably connected; the first spring 245 is sleeved on the top shaft 244, the first spring 245 on the top shaft 244 corresponding to the first wedge block 242 touches the side wall of the neutralization tank 21 and the ball head 2441, and the first spring 245 on the top shaft 244 corresponding to the second wedge block 243 touches the ball head 2441 and the side wall of the installation bin 241; by setting the contact position of the first spring 245, the sliding directions of the top shaft 244 at the first wedge block 242 and the top shaft 244 at the second wedge block 243 are opposite when they move at the same time.

[0075] The adjusting mechanism 25 comprises a power shaft 251, a first adjusting arm 252, a first connecting rod 253, a third rotating shaft 254 and a fixed plate 255; the fixed plate 255 is provided with a pair and fixed on the top of the neutralization tank 21, the two ends of the power shaft 251 are rotatably connected to the fixed plate 255, a sprocket is provided on the power shaft 251, the first adjusting arm 252 is provided with a pair and fixed at both ends of the power shaft 251, one end of the first connecting rod 253 is hinged to the end of the first adjusting arm 252, and the other end of the first connecting rod 253 is hinged to the end of the fixed rod 2423; the third rotating shaft 254 is rotatably connected to the motor seat and the fixed plate 255, the third rotating shaft 254 is provided with a bevel gear and meshes with the bevel gear on the main shaft 22, the third rotating shaft 254 is also provided with a sprocket and connected to the sprocket on the power shaft 251 through a chain; the third rotating shaft 254 is driven to rotate by the second motor 23, and then the power shaft 251 is driven to rotate, so that the first connecting rod 253 is used to drive the control mechanism 24 to operate.

[0076] The stirring mechanism 26 includes a first fixed shaft 261, a mounting block 262, a second fixed shaft 263, and an arc-shaped arm 264; the mounting block 262 is provided with a pair of and plugged with the first fixed shaft 261, the mounting block 262 and the first fixed shaft 261 are slidably connected, the mounting block 262 and the first fixed shaft 261 are arranged in the mounting groove 221, the first fixed shaft 261 is fixedly connected to the main shaft 22, the first fixed shaft 261 is provided with a sleeved second spring 2611, the second spring 2611 contacts the mounting block 262, the mounting block 262 has a fixedly connected second fixed shaft 263 at both ends, the second fixed shaft 263 is provided with a rotatably connected first fan plate 2631, The second fan plate 2632; a cross bar 2633 is also provided on the second fixed shaft 263, and the cross bar 2633 is arranged between the first fan plate 2631 and the second fan plate 2632; the arc-shaped arm 264 is provided with a pair and is symmetrically arranged, and the arc-shaped arm 264 is arranged between the mounting blocks 262; a hinged second connecting rod 2641 is provided on the arc-shaped arm 264, and one end of the second connecting rod 2641 is hinged to the end of the cross bar 2633; the arc-shaped arm 264 pushes the top shaft 244; the control mechanism 24 controls the top shaft 244 to be ejected and then pushes the arc-shaped arm 264 to move through the top shaft 244, and then cooperates with the second connecting rod 2641 to push the second fixed shaft 263 to move up and down along the first fixed shaft 261.

[0077] Furthermore, the second fan plate 2632 is simultaneously slidably connected and rotationally connected to the second fixed shaft 263, and one side of the second fan plate 2632 is provided with a third spring 2635 which is sleeved on the second fixed shaft 263 and a limit plate 2636 fixed to the end of the second fixed shaft 263 by bolts; the third spring 2635 contacts the limit plate 2636 and the second fan plate 2632, pushing the second fan plate 2632 to slide on the second fixed shaft 263.

[0078] Furthermore, the arc-shaped arm 264 section is provided with a guide block 2642, and the maximum distance that one end of the top shaft 244 extends into the neutralization tank 21 is enough to touch the guide block 2642. When the stirring mechanism 26 rotates following the main shaft 22, the top shaft 244 can smoothly slide and touch the side wall of the arc-shaped arm 264 through the top contact of the guide block 2642 after detaching from the arc-shaped arm 264.

[0079] Furthermore, a circular plate 26321 is provided on one side of the second fan plate 2632 for contacting the third spring 2635 to receive the spring thrust.

[0080] Furthermore, a lever 222 is provided at the bottom of the main shaft 22, and the lever 222 is arranged in an arc shape. When the main shaft 22 rotates, the debris settled at the bottom of the neutralization tank 21 is moved by the convex arc surface on the lever 222, and finally discharged at the second discharge port 211.

[0081] Furthermore, a top block 246 is provided at the end of the top shaft 244 to increase the top contact area between the top shaft 244 and the arc-shaped arm 264 , which can effectively ensure smooth contact between the top shaft 244 and the arc-shaped arm 264 .

[0082] When the neutralization mechanism 2 performs acid-base neutralization of the wastewater, the neutralizing agent is added through the feeding pipe 4, and then the second motor 23 drives the main shaft 22 to rotate, thereby driving the power shaft 251 in the adjusting mechanism 25 to rotate, and then the first connecting rod 253 moves to pull the fixing rod 2423 to make the first wedge block 242 and the second wedge block 243 move up and down in the installation bin 241, so that the first wedge block 242 and the second wedge block 243 push one end of the top shaft 244 to extend and retract inside the neutralization tank 21, and because the wedge surfaces of the first wedge block 242 and the second wedge block 243 are arranged opposite to each other, the sliding directions of the pair of top shafts 244 arranged up and down are always opposite, and finally the arc arm 264 is pushed by the top shaft 244 to move, and then The arc arm 264 cooperates with the second connecting rod 2641 to move the second fixed shaft 263 in the installation groove 221. When the top shaft 244 retracts, the installation block 262 slides downward under the push of the second spring 2611, so that the rotation position of the first fan plate 2631 and the second fan plate 2632 is changed; further, the centrifugal force generated by the rotation of the main shaft 22 and the cooperation of the third spring 2635 can also realize the sliding of the second fan plate 263 on the second fixed shaft 263, thereby changing the stirring range; the first fan plate 2631 and the second fan plate 2632 rotate along the second fixed shaft 263 under the resistance of the water flow during the rotation of the main shaft 22 and continuously change their positions in the neutralization tank 21, which can effectively accelerate the mixing and neutralization effects.

[0083] Embodiment 2:

[0084] The difference compared with Example 1 is:

[0085] Step 2) Neutralization treatment by neutralization mechanism: The acidic wastewater after preliminary filtration enters the neutralization tank through the second water inlet pipe; then an alkaline neutralizer is added, and sodium hydroxide is used as the neutralizer, and neutralization is performed by rotating the main shaft; the main shaft speed is set to 50 r / min; the mixing and stirring time is set to 30 minutes, and after mixing and neutralization, it is left to stand for 10 minutes to allow the impurities to partially settle;

[0086] Step 3) flocculation treatment by coagulation mechanism: fine impurities in the wastewater are flocculated and precipitated by adding flocculants in the coagulation mechanism; the coagulation tank adopts a conventional open square tank with a mixing and stirring mechanism, the flocculant dosage is set to 200 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing;

[0087] The mixing time is 25 minutes, and then it is left to stand for 5 minutes.

[0088] The second stage mixing time is 125 minutes, and the standing time is 10 minutes.

[0089] The three-stage mixing time is 15 minutes. After the three-stage mixing and stirring is completed, it is left to stand until the precipitation is completed; the standing treatment is to give the flocculant enough time to combine with the fine impurities in the wastewater;

[0090] 4) Activated carbon adsorption treatment: The wastewater after coagulation treatment is sucked into the activated carbon adsorption mechanism for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank combined with an activated carbon adsorption plate for filtration and adsorption. The activated carbon adsorption plate is composed of filled activated carbon particles. This scheme is a conventional existing technology; the particle size of the granular activated carbon is 2.55mm; the bulk density of the activated carbon particles is 0.5g / cm 3 ; The thickness of the activated carbon adsorption plate is 90mm; The activated carbon adsorption plate is regenerated using 950℃ high temperature steam;

[0091] Embodiment 3:

[0092] The difference compared with Example 1 is:

[0093] 2) Neutralization treatment by neutralization mechanism: The acidic wastewater after preliminary filtration enters the neutralization tank through the second water inlet pipe; then the alkaline neutralizer is added, and sodium hydroxide is used as the neutralizer, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 45 r / min; the mixing time is set to 25min, and after mixing and neutralization, it is left to stand for 9min to allow some impurities to settle;

[0094] 3) Flocculation treatment by coagulation mechanism: fine impurities in wastewater are flocculated and precipitated by adding flocculants into the coagulation mechanism; the coagulation tank adopts the conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 100 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing;

[0095] The mixing time is 22 minutes, and then it is left to stand for 5 minutes.

[0096] The second stage mixing time is 20 minutes, and the standing time is 8 minutes.

[0097] The three-stage mixing time is 13 minutes. After the three-stage mixing and stirring is completed, it is left to stand until the precipitation is completed; the standing treatment is to give the flocculant enough time to combine with the fine impurities in the wastewater;

[0098] 4) Activated carbon adsorption treatment: The wastewater after coagulation treatment is sucked into the activated carbon adsorption mechanism for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank combined with an activated carbon adsorption plate filtration adsorption scheme. The activated carbon adsorption plate is composed of filled activated carbon particles. This scheme is a conventional existing technology; the particle size of the granular activated carbon is 1mm; the bulk density of the activated carbon particles is 0.45g / cm 3 ; The thickness of the activated carbon adsorption plate is 70mm; The activated carbon adsorption plate is regenerated using 850℃ high temperature steam;

[0099] Comparative Example 1:

[0100] The difference from Example 1 is step 2) neutralization treatment by neutralization mechanism: the spindle speed is set to 30 r / min; the mixing time is set to 15 min, and the mixture is allowed to stand for 8 min after mixing and neutralization.

[0101] Comparative Example 2:

[0102] The difference from Example 1 is as follows: Step 2) Neutralization treatment by neutralization mechanism: the spindle speed is set to 65 r / min; the mixing time is set to 40 min, and the mixture is allowed to stand for 15 min after mixing and neutralization.

[0103] Comparative Example 3:

[0104] The difference from Example 1 is as follows: Step 3) flocculation treatment by a coagulation mechanism, the dosage of the flocculant is set to 40 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing;

[0105] The mixing time is 15 minutes, and then it is left to stand for 5 minutes.

[0106] The second stage mixing time is 10 minutes, and the standing time is 5 minutes.

[0107] The three-stage mixing time is 8 min;

[0108] Comparative Example 4:

[0109] The difference from Example 1 is that: Step 3) the flocculation treatment is carried out by the coagulation mechanism, the dosage of the flocculant is set to 220 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing;

[0110] The mixing time is 30 minutes, and then it is left to stand for 5 minutes.

[0111] The second stage mixing time is 30 minutes, and the standing time is 15 minutes.

[0112] The three-stage mixing time is 20 min;

[0113] Test Example 1: The difference from Example 1 is that this implementation does not use the preliminary filtration in the filtration bin of step 1), and directly introduces step 2) for implementation;

[0114] Test Example 2: The difference from Example 1 is that the flocculation treatment of the coagulation mechanism in step 3) adopts an overall one-stage mixing method; the mixing time is 55 minutes

[0115] According to GB13456-2012 "Iron and Steel Industry Water Pollutant Discharge Standard", the above examples, comparative examples and test examples were checked and measured:

[0116] pH value (6-9) Metal iron ion mg / L Suspended matter mg / L Fluoride mg / L in conclusion Example 1 7 1.4 18 8.6 qualified Example 2 7.5 1.35 17.5 7.4 qualified Example 3 8.5 1.5 16 8.2 qualified Comparative Example 1 5.3 2.2 22.5 11.5 Failure Comparative Example 2 6.8 1.95 18.3 9 qualified Comparative Example 3 7.2 3.1 24.6 8.6 Failure Comparative Example 4 7.3 2.35 26.8 11.5 Failure Test Example 1 8.2 1.62 27.3 9.2 Failure Test Example 2 7.8 1.54 26.2 10.6 Failure

[0117] Based on the above standards and implementation results, we can summarize:

[0118] Examples 1-3 were implemented according to the process setting standards, and the wastewater treatment results obtained met the requirements of the "Iron and Steel Industry Water Pollutant Discharge Standards";

[0119] The neutralization time of Comparative Example 1 is less than the set range of the process neutralization treatment time, the pH value in the treatment result is lower than the standard, and the treatment values ​​of metal iron ions, suspended matter, and fluoride are all higher than the standard;

[0120] The neutralization time of comparative example 2 is greater than the setting of the process neutralization treatment time, and all the test values ​​meet the standard requirements, but the working time is greater than the setting of the neutralization treatment time, and the treatment time is too long;

[0121] In comparative example 3, the dosage of flocculant is less than the dosage standard set by the process, and the treatment data of suspended solids is much higher than the wastewater treatment standard;

[0122] In Comparative Example 4, the amount of flocculant added was greater than the standard set by the process, and the treatment data of suspended matter was much higher than the wastewater treatment standard, and the experimental data of suspended matter and metallic iron ions increased instead of decreasing; the reason was that the amount of flocculant added was too high, resulting in suspended matter, and the redissolution of metallic iron ions caused the data to be too high;

[0123] In Example 1, the suspended solids value in the experimental data did not meet the standard and was significantly higher than that in other embodiments because no preliminary filtration was used; therefore, preliminary filtration was required to reduce the burden of subsequent processing;

[0124] The suspended matter value in the experimental data of Example 2 does not meet the standard. The one-time mixing method is obviously conducive to observing the treatment process and making timely adjustments;

[0125] Judging from the above summary, the process of the present invention has good treatment effect and treatment efficiency for the treatment of stainless steel pickling wastewater.

[0126] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0127] In summary, the electronic or electrical components including but not limited to motors, monitors, etc. are components in the prior art, obtained through private customization or purchase, and the electrical connections between the components are conventional circuit connections or electrical connections in the prior art, which are not within the scope of protection of the present invention;

[0128] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A stainless steel production pickling wastewater treatment system and its treatment process, characterized in that The specific process steps are as follows: 1) Preliminary filtration in the filter chamber: wastewater enters the filter chamber along the pipe head through the first water inlet pipe, and the larger debris in the pickling wastewater is preliminarily filtered through the filter plate; during the filtration process, the adjustment plate can be driven by the first motor to rotate around the first rotating shaft, so that the adjustment plate pushes the filter plate for alternate use; wherein, the aperture of the filter plate is 2-3mm, and the interval between the two pairs of filter plates is 1.5-2h under the condition of continuous and uninterrupted water filtration, the speed of the first motor is 80r / min, and the adjustment plate is rotated and the filter plate is pushed alternately within 30-35s through the coupling and the reducer; The angle between the installed filter plate and the side wall of the filter chamber is 45-55°, and the optimal angle is 50°; The pipe head completes the conversion in 8-10 seconds so that the wastewater can flush the alternating filter plates; 2) Neutralization treatment by neutralization mechanism: The acidic wastewater after preliminary filtration enters the neutralization tank through the second water inlet pipe; then an alkaline neutralizer is added, and the neutralizer uses sodium hydroxide, which is neutralized by the rotation of the main shaft; 3) Flocculation treatment by coagulation mechanism: fine impurities in wastewater are flocculated and precipitated by adding flocculants into the coagulation mechanism; the coagulation tank adopts the conventional open square tank with a mixing and stirring mechanism inside, and the flocculant dosage is set at 50-200 mg / L. 4) Activated carbon adsorption treatment: The wastewater after coagulation treatment is pumped into the activated carbon adsorption mechanism for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank, and the activated carbon adsorption plate is composed of activated carbon particles filled; 5) Post-treatment of wastewater and sludge: qualified wastewater enters the discharge procedure and is discharged in sequence, and then the sediment in the coagulation and sedimentation and neutralization tanks is dehydrated; A stainless steel production pickling wastewater treatment system comprises a filtering chamber, a neutralizing mechanism, a coagulating mechanism and an activated carbon adsorption mechanism which are arranged in sequence; the pickling wastewater is initially filtered through the filtering chamber, then enters the neutralizing mechanism for acid-base neutralization, then enters the coagulating mechanism for flocculation and precipitation, and finally the wastewater is discharged and the sludge is dehydrated and transferred.

2. A stainless steel production pickling wastewater treatment system and treatment process according to claim 1, characterized in that In step 2), the spindle speed is set to 40-50 r / min; the mixing time is set to 20-30min, and after mixing and neutralization, the mixture is allowed to stand for 8-10min to allow the impurities to partially settle; the pH value is then monitored by a monitor, and the next step of the treatment process is entered if it meets the requirements; In step 3), an intermittent mixing and stirring method is adopted, which is divided into three stages of mixing; The mixing time is 20-25 minutes, and then it is left to stand for 5 minutes. The second stage mixing time is 15-25 minutes, and the standing time is 5-10 minutes. The three-stage mixing time is 10-15 minutes. After the three-stage mixing and stirring is completed, it is left to stand until the precipitation is completed; the standing treatment is to give the flocculant enough time to combine with the fine impurities in the wastewater; Step 4) The particle size of the activated carbon particles is 0.5-2.55 mm; the bulk density of the activated carbon particles is 0.4-0.5 g / cm 3 ; The thickness of the activated carbon adsorption plate is 50-90mm; The activated carbon adsorption plate is regenerated using high-temperature steam of 800-950℃.

3. A stainless steel production pickling wastewater treatment system and treatment process according to claim 1, characterized in that In step 1), a first guide groove and a second guide groove are provided on the inner wall of the filter bin, an adjustment plate is provided in the filter bin, first rotating shafts are provided on both sides of the bottom of the adjustment plate, the first rotating shaft is rotatably connected to the side walls of the filter bin, a first worm gear is provided on the first rotating shaft, a first motor fixed by a motor seat is provided on the outer wall of the filter bin, a first worm gear fixed by a bearing seat is provided on the shaft end of the first motor, the first worm gear meshes with the first worm gear, first discharge ports that can be opened and closed are provided on both side walls of the filter bin, symmetrical filter plates are provided on both sides of the adjustment plate, a limiting shaft and a second rotating shaft are provided on the filter plate, a guide plate is provided below the filter plate for receiving missed filtered materials, and the guide plate is aligned with the first discharge port; the filter plate is aligned with the first discharge port; the second rotating shaft is provided in the first guide groove, the limiting shaft is provided in the second guide groove, the filter plate makes the second rotating shaft and the limiting shaft slide in the first guide groove to complete the installation, the filter plate can rotate with the second rotating shaft as the axis, the second guide groove is set in an arc shape and takes the second rotating shaft on the filter plate after installation as the axis, so that the limiting shaft can slide in the second guide groove; A mounting plate is provided on the side wall of the filter bin, the mounting plate is provided with a fixed first water inlet pipe, the first water inlet pipe is provided with a pipe head connected by a rotating joint, and teeth are provided on the outer wall circumference of the pipe head; a third motor is provided on the mounting plate; a gear is provided on the output shaft of the third motor and meshes with the teeth on the outer wall of the pipe head; the pipe head is driven to rotate by the third motor so that the pipe head is aligned with the filter plate; a drain pipe is provided at the bottom of the filter bin.

4. A stainless steel production pickling wastewater treatment system and treatment process according to claim 1, characterized in that The neutralization mechanism in step 2) includes a neutralization tank, a main shaft, a second motor, a control mechanism, an adjustment mechanism, and a stirring mechanism; the control mechanism is provided with a pair and is symmetrically arranged on both sides of the neutralization tank, the main shaft is arranged inside the neutralization tank and is rotatably connected to each other, the second motor is arranged at the top of the neutralization tank and fixed by a motor seat, and the output shaft of the second motor is connected to the top of the main shaft; the adjustment mechanism is arranged at the top of the neutralization tank and connected to the control mechanism; the stirring mechanism is provided with a pair and is arranged on the main shaft; the second motor provides power to drive the adjustment mechanism and the control mechanism to operate, and then controls the stirring mechanism to stir and accelerate the neutralization effect; a feeding pipe, a water pumping pipe, and a second water inlet pipe are also provided on the top of the neutralization tank; the feeding pipe is used to add a neutralizer, the second water inlet pipe is connected to the drain pipe for water inlet, the water pumping pipe is close to the inner wall of the neutralization tank, and the pipe mouth can adjust the depth up and down to pump water into the next treatment process section; A conical platform and a second discharge port that can be opened and closed are provided at the bottom of the neutralization tank. The main shaft is rotatably connected to the top wall of the neutralization tank and the conical platform. A mounting groove is provided on the main shaft. The main shaft is composed of two pairs of semi-cylinders and fixed with bolts. A bevel gear is provided on the top of the main shaft. A monitor for pH value monitoring is provided on the side wall of the neutralization tank.

5. A stainless steel production pickling wastewater treatment system and treatment process according to claim 4, characterized in that The control mechanism includes an installation bin, a first wedge block, a second wedge block, a top shaft, and a first spring, wherein the installation bin is fixed to the side wall of the neutralization tank, and a first through slot is provided on the installation bin; the first wedge block and the second wedge block are arranged up and down and fixedly connected through a connecting plate, a limit block is provided on the connecting plate, and the limit block is arranged in the first through slot for limiting; the wedge surfaces of the first wedge block and the second wedge block are arranged oppositely, the wedge surface of the first wedge block faces the side wall of the neutralization tank, and the second wedge block is provided with a second through slot for avoiding the top shaft; the first wedge block is provided with a fixing rod, and the fixing rod is slidably connected to the top wall of the installation bin; the top shaft is provided with a pair of and respectively The first wedge block and the second wedge block should be connected; the top shaft passes through the side wall of the neutralization tank and is slidably connected, and a ball head is provided on the top shaft, and the ball head touches the wedge surfaces of the first wedge block and the second wedge block; one end of the top shaft at the second wedge block also passes through the side wall of the installation bin and is slidably connected; the first spring is sleeved on the top shaft, and the first spring on the top shaft corresponding to the first wedge block touches the side wall of the neutralization tank and the ball head, and the first spring on the top shaft corresponding to the second wedge block touches the ball head and the side wall of the installation bin; by setting the contact position of the first spring, the sliding directions of the top shaft at the first wedge block and the top shaft at the second wedge block are opposite when they move at the same time.

6. A stainless steel production pickling wastewater treatment system and treatment process according to claim 4, characterized in that The adjusting mechanism comprises a power shaft, a first adjusting arm, a first connecting rod, a third rotating shaft and a fixed plate; a pair of the fixed plates are provided and fixed on the top of the neutralization tank, two ends of the power shaft are rotatably connected to the fixed plates, a sprocket is provided on the power shaft, a pair of the first adjusting arms are provided and are respectively fixed at two ends of the power shaft, one end of the first connecting rod is hinged to the end of the first adjusting arm, and the other end of the first connecting rod is hinged to the end of the fixed rod; the third rotating shaft is rotatably connected to the motor seat and the fixed plate, a bevel gear is provided on the third rotating shaft and meshes with the bevel gear on the main shaft, a sprocket is also provided on the third rotating shaft and is connected to the sprocket on the power shaft through a chain; the third rotating shaft is driven to rotate by the second motor, thereby driving the power shaft to rotate, thereby utilizing the first connecting rod to drive the control mechanism to operate.

7. A stainless steel production pickling wastewater treatment system and treatment process according to claim 4, characterized in that The stirring mechanism comprises a first fixed shaft, a mounting block, a second fixed shaft, and an arc arm; the mounting block is provided with a pair of and plugged into the first fixed shaft, the mounting block is slidably connected to the first fixed shaft, the mounting block and the first fixed shaft are arranged in the mounting groove, the first fixed shaft is fixedly connected to the main shaft, a sleeved second spring is provided on the first fixed shaft, and the second spring contacts the mounting block, and two ends of the mounting block are provided with a fixedly connected second fixed shaft, and the second fixed shaft is provided with a first fan plate and a second fan plate that are rotatably connected; the second fixed shaft is also provided with a cross bar, the cross bar is arranged between the first fan plate and the second fan plate, the arc arm is provided with a pair of and symmetrically arranged arc arms, the arc arm is arranged between the mounting blocks, the arc arm is provided with a hinged second connecting rod, and one end of the second connecting rod is hinged to the end of the cross bar; the arc arm pushes the top shaft; the top shaft is controlled to be ejected by the control mechanism, and then the arc arm is pushed to move by the top shaft, and then the second connecting rod cooperates with the second fixed shaft to move up and down along the first fixed shaft; The arc-shaped arm section is provided with a guide block, and the maximum distance that one end of the top shaft extends into the neutralization tank can touch the guide block. When the stirring mechanism rotates with the main shaft, the top shaft can smoothly slide and touch the side wall of the arc-shaped arm through the top contact of the guide block after separating from the arc-shaped arm.

8. A stainless steel production pickling wastewater treatment system and treatment process according to claim 7, characterized in that The second fan plate is simultaneously connected to the second fixed shaft by sliding and rotation, and one side of the second fan plate is provided with a third spring sleeved on the second fixed shaft and a limit plate fixed to the end of the second fixed shaft by bolts; the third spring contacts the limit plate and the second fan plate, pushing the second fan plate to slide on the second fixed shaft; A circular plate is provided on one side of the second fan plate for contacting the third spring to facilitate receiving the spring thrust.

9. A stainless steel production pickling wastewater treatment system and treatment process according to claim 4, characterized in that A lever is provided at the bottom of the main shaft, and the lever is arranged in an arc shape. When the main shaft rotates, the debris settled at the bottom of the neutralization tank is agitated through the convex arc surface on the lever, and finally discharged at the second discharge port.

10. A stainless steel production pickling wastewater treatment system and treatment process according to claim 7, characterized in that The end of the top shaft is provided with a top block to increase the top contact area between the top shaft and the arc-shaped arm, which can effectively ensure that the top shaft and the arc-shaped arm are in smooth contact.

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