Treatment method for wastewater with high phosphorus content, high turbidity and high oil content

Abstract

The present invention relates to a method for treating wastewater with high phosphorus content, high turbidity and high oil content, comprising S1, using a sand settling tank to remove sand and gravel in the wastewater; S2, using an oil removal and decolorization tank to remove pigments and oil in the wastewater; S3, passing the wastewater into a reaction tank, adding a suitable weight of lime to the reaction tank according to the phosphorus content, and then adding a suitable weight of flocculant to the reaction tank, the flocculant and the suspended matter in the wastewater undergo flocculation reaction to generate large particles of solid; S4, using an inclined tube sedimentation tank to remove large particles of solid; S5, using a phosphorus adsorption filler layer in a deep filtration tank to adsorb the residual phosphorus in the wastewater, and a filter material layer to filter out small particles of solid in the wastewater; S6, after the water quality test is qualified, the wastewater is discharged. The present invention can remove pigments and oil in the wastewater, reduce pollutants, and improve the quality of effluent water by setting an oil removal and decolorization tank. The deep filtration tank can further remove micro suspended matter and pollutants such as phosphorus in the wastewater to improve the quality of effluent water.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating wastewater with high phosphorus content, high turbidity and high oil content. Background Art

[0002] Phosphate mine water has the characteristics of large discharge, poor water index and poor sensory properties. The specific water quality is related to the mining site, mining layer and mining method. Some phosphate mine water has high phosphorus content, high turbidity and contains a certain amount of oil. Traditional treatment processes such as Figure 1 As shown, the wastewater first passes through a grit chamber to remove large solid particles, then enters a four-stage reaction tank, and four reagents are added to the four-stage reaction tank to react with the phosphorus, suspended solids, etc. in the wastewater to generate precipitated substances. Finally, the wastewater passes through a sedimentation tank and a structured filler sedimentation tank (a structured filler sedimentation tank is a sedimentation tank with granular fillers inside) for sedimentation before entering a clear water tank. The monitoring equipment monitors the water quality of the clear water tank, and the wastewater is discharged after the water quality is qualified. The existing process has no deep treatment link, no oil pollution interception link, the chroma cannot be removed, and the total phosphorus cannot be controlled below 0.1 mg / L. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for treating wastewater with high phosphorus content, high turbidity and high oil content, so as to improve the treatment effect.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a method for treating wastewater with high phosphorus content, high turbidity and high oil content, comprising:

[0005] S1. Use a grit chamber to remove sand and gravel from wastewater;

[0006] S2. The wastewater treated in step 1 is passed into an oil removal and decolorization tank to remove pigments and oil in the wastewater;

[0007] S3, passing the wastewater treated in step 2 into a reaction tank, setting a suspended matter online monitoring device and a first phosphorus content online monitoring device at the entrance of the reaction tank, first adding a suitable weight of lime to the reaction tank according to the phosphorus content detected by the first phosphorus content online monitoring device, the lime reacts with the inorganic phosphorus in the wastewater to generate a precipitate, and then adding a suitable weight of flocculant to the reaction tank according to the suspended matter content monitored by the suspended matter online monitoring device, the flocculant and the suspended matter in the wastewater undergo a flocculation reaction to generate large particles of solid;

[0008] S4, passing the wastewater treated in step 3 into an inclined tube sedimentation tank to remove large particles of solids;

[0009] S5, passing the wastewater treated in step 4 into a deep filtration tank, wherein a phosphorus adsorption filler layer and a plurality of filter material layers are provided in the deep filtration tank, wherein the phosphorus adsorption filler layer adsorbs the residual phosphorus in the wastewater, and the filter material layer filters out small solid particles in the wastewater;

[0010] S6. The wastewater treated in step S5 is passed into a clean water tank, and a second online phosphorus content monitoring device is set at the outlet of the clean water tank. After the water quality test is qualified, the wastewater is discharged.

[0011] Furthermore, in step S2, the inner cavity of the deoiling and decolorizing tank is divided into a dosing area and a deoiling area by a vertical partition, and a water inlet channel connecting the dosing area and the deoiling area is provided at the bottom of the partition; an aeration mechanism is provided at the bottom of the deoiling area, and an oil scraping mechanism is provided at the top of the deoiling area;

[0012] Wastewater enters the dosing area from the top of the dosing area, decolorizing agent is added to the dosing area, and the wastewater enters the oil removal area through the wastewater inlet channel. Under the action of the aeration mechanism, the decolorizing agent and the wastewater are evenly mixed, and the scum and oil in the wastewater float to the surface of the wastewater, and the oil scraper mechanism collects the scum and oil.

[0013] Furthermore, the oil scraping mechanism comprises a movable bracket, the movable bracket is provided with a lifting mechanism, the lifting mechanism is connected to a lifting frame, the lifting frame is provided with a horizontal oil collecting pipe and a rotation driving mechanism for driving the oil collecting pipe to rotate;

[0014] A first scraper and a second scraper are fixedly provided on both sides of the oil collecting pipe, respectively; a first feed port is provided above the connection between the first scraper and the oil collecting pipe, and a second feed port is provided above the connection between the second scraper and the oil collecting pipe; when the rotary driving mechanism drives the oil collecting pipe to rotate to a first oil scraping angle, the first scraper scrapes the oil, and an end of the first scraper away from the oil collecting pipe is lower than the first feed port, and an end of the second scraper away from the oil collecting pipe is higher than the second feed port; when the rotary driving mechanism drives the oil collecting pipe to rotate to a second oil scraping angle, the second scraper scrapes the oil, and an end of the second scraper away from the oil collecting pipe is lower than the second feed port, and an end of the first scraper away from the oil collecting pipe is higher than the first feed port;

[0015] The lifting frame is provided with a detection element for detecting the distance from the lifting frame to the wastewater liquid level. The detection element and the lifting mechanism are both connected to a first controller. The first controller adjusts the height of the lifting frame according to the detection result of the detection element, so that when the oil collecting pipe is rotated to a first oil scraping angle, the first feed port and the wastewater liquid level are at the same height, and when the oil collecting pipe is rotated to a second oil scraping angle, the second feed port and the wastewater liquid level are at the same height.

[0016] Furthermore, a fixed ring plate is provided at one end of the oil collecting pipe, a slider is detachably connected to the inner side of the fixed ring plate, the slider is slidably matched with the oil collecting pipe, and a detachable plug is provided at one end of the oil collecting pipe.

[0017] Furthermore, the rotation drive mechanism is a stepping motor, and the lifting mechanism is a hydraulic cylinder.

[0018] Further, in step S3, the first phosphorus content online monitoring device and the suspended matter online monitoring device are both connected to a second controller, a lime adding mechanism and a flocculant adding mechanism are provided above the reaction tank, the lime adding mechanism and the flocculant adding mechanism both include a storage bin, a dosing port is provided at the bottom of the storage bin, a vertical dosing rod is provided in the storage bin, a dosing motor is connected to the top of the dosing rod through a crank slider mechanism, the lower end of the dosing rod can extend into the dosing port and slide with the dosing port, and the dosing motor is connected to the second controller;

[0019] The first phosphorus content online monitoring device and the suspended matter online monitoring device transmit the detection signals to the second controller, and the second controller adjusts the speed of the dosing motor according to the phosphorus content and the suspended matter content, thereby controlling the dosing amount.

[0020] Further, in step S5, the filter material layer includes a first quartz sand filter layer, a second quartz sand filter layer and a third quartz sand filter layer arranged in sequence from bottom to top, the particle sizes of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer gradually decrease, the upper surfaces of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer are all provided with backwashing pipe networks, and a second sewage pump is provided at the bottom of the deep filter tank; the phosphorus adsorption filler layer is arranged above the third quartz sand filter layer.

[0021] Furthermore, a mud discharge mechanism is provided at the bottom of the inclined tube sedimentation tank.

[0022] The beneficial effects of the present invention are as follows: 1. The present invention can remove pigments and oil in wastewater by setting up an oil removal and decolorization tank, reduce pollutants, and improve effluent water quality.

[0023] 2. Since the phosphorus content and suspended solids content in the wastewater are variable, the present invention utilizes the first phosphorus content online monitoring device and the suspended solids online monitoring device to monitor the phosphorus content and suspended solids content in the wastewater in real time, and adds appropriate amounts of lime and flocculant according to the detection results, which can prevent excessive or insufficient addition of the agent, thereby making full use of the agent.

[0024] 3. The deep filtration tank can further remove tiny suspended matter and pollutants such as phosphorus in the wastewater and improve the water quality of the effluent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of existing wastewater treatment;

[0026] Figure 2 It is a schematic diagram of wastewater treatment of the present invention;

[0027] Figure 3 It is a schematic diagram of the main view of the oil removal and decolorization tank;

[0028] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0029] Figure 5 yes Figure 4 A schematic cross-sectional view of the middle BB;

[0030] Figure 6 This is a schematic diagram of the first scraper when scraping oil;

[0031] Figure 7 This is a schematic diagram of the second scraper when scraping oil;

[0032] Figure 8 It is a schematic diagram of the main view of the reaction pool;

[0033] Fig. 9 This is a schematic diagram of the mud discharge mechanism at the bottom of the inclined tube sedimentation tank;

[0034] Fig.10 It is a schematic diagram of the main view of the deep filtration tank;

[0035] Figure numerals: 1-sand settling tank; 2-oil removal and decolorization tank; 21-partition plate; 22-drug adding area; 23-oil removal area; 24-water inlet channel; 25-aeration mechanism; 26-movable bracket; 27-lifting mechanism; 28-lifting frame; 29-oil collecting pipe; 210-rotation driving mechanism; 211-first scraper; 212-second scraper; 213-first feed inlet; 214-second feed; 215-detection element; 216-first controller; 217-fixed ring plate; 218-sliding block; 219-plug; 3-reaction tank; 31-suspended matter online monitoring device; 32-first phosphorus content online monitoring device; 33 —Second controller; 34—storage bin; 35—dosing port; 36—dosing rod; 37—dosing motor; 4—inclined tube sedimentation tank; 41—connector; 42—sewage inlet side wall; 43—sewage outlet side wall; 44—sewage inlet; 45—lower sewage cleaning port; 46—upper sewage cleaning port; 47—sewage outlet; 48—sewage cleaning door; 49—sewage outlet; 410—switch; 411—sewage pipe; 412—first sewage pump; 413—porous mud pipe; 5—depth filter tank; 51—filter material layer; 52—phosphorus adsorption filler layer; 53—backwashing pipe network; 54—second sewage pump; 6—clear water tank; 61—second phosphorus content online monitoring equipment. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] The method for treating wastewater containing high phosphorus, high turbidity and high oil content of the present invention is as follows: Figure 2 Shown, including

[0038] S1. Use a grit chamber 1 to remove sand and gravel from wastewater. The grit chamber 1 can use an existing chamber body. Wastewater flows slowly in the grit chamber 1, and large particles of sand and gravel in the wastewater settle to the bottom of the grit chamber 1.

[0039] S2, the wastewater after treatment in step 1 is passed into deoiling and decolorizing tank 2 to remove pigment and oil in the wastewater.

[0040] Specifically, Figure 3 and Figure 4 As shown, the inner cavity of the deoiling and decolorizing tank 2 is divided into a dosing area 22 and an deoiling area 23 by a vertical partition 21, and a water inlet channel 24 connecting the dosing area 22 and the deoiling area 23 is provided at the bottom of the partition 21; an aeration mechanism 25 is provided at the bottom of the deoiling area 23, and an oil scraping mechanism is provided at the top of the deoiling area 23.

[0041] Wastewater enters the dosing area 22 from the top of the dosing area 22, decolorizing agent is added to the dosing area 22, and the wastewater inlet channel 24 enters the oil removal area 23. Under the action of the aeration mechanism 25, the decolorizing agent and the wastewater are evenly mixed, and the scum and oil in the wastewater float to the surface of the wastewater, and the oil scraping mechanism collects the scum and oil.

[0042] The water inlet of the dosing area 22 is arranged at the top of the dosing area 22 and at one end away from the partition 21, and the water outlet of the degreasing area 23 is arranged at the top of the degreasing area 23 and at one end away from the partition 21, so as to extend the flow path of the wastewater. A dosing mechanism can be arranged above the dosing area 22 to add a decolorant to the wastewater to eliminate the pigment in the wastewater, and the decolorant can be an existing oxidative decolorant or an adsorption decolorant.

[0043] The oil in the wastewater is mixed in the water and is difficult to automatically float to the wastewater surface. Therefore, an aeration mechanism 25 is provided at the bottom of the deoiling area 23. The aeration mechanism 25 can pass the outside air into the deoiling area 23, and a large number of bubbles are formed at the bottom of the deoiling area 23. The bubbles flow upward, which can drive the oil in the wastewater to float quickly to the wastewater surface. In addition, impurities such as scum in the wastewater will also float to the liquid surface with the bubbles, reducing the turbidity of the wastewater. At the same time, aeration can also promote the decolorant and the wastewater to be fully and evenly mixed to ensure uniform decolorization.

[0044] There are many existing wastewater surface scraping mechanisms, most of which use scrapers that can move horizontally for scraping oil. The existing scrapers have the following defects: 1. The oil can only be scraped in one direction, which is inefficient; 2. After the scraper is stained with oil, it is easy to drip back into the water; 3. The height adjustment of the scraper is unchanged, and the scraper height cannot be automatically and flexibly adjusted according to the liquid level.

[0045] In order to solve the above problems, the oil scraping mechanism of the present invention includes a movable bracket 26, which can move horizontally back and forth. Specifically, guide rails can be set on the top surfaces on both sides of the oil removal and decolorization tank 2, and a group of rollers matching the guide rails are set at the bottom of the movable bracket 26. At the same time, a movable motor is set on the movable bracket 26. When the movable motor rotates, it can drive the rollers to rotate, thereby driving the movable bracket 26 to move horizontally along the guide rails.

[0046] The movable bracket 26 is provided with a lifting mechanism 27, the lifting mechanism 27 is connected to a lifting frame 28, and the lifting frame 28 is provided with a horizontal oil collecting pipe 29 and a rotation driving mechanism 210 for driving the oil collecting pipe 29 to rotate. When the movable bracket 26 moves, it drives the lifting mechanism 27, the lifting frame 28, the oil collecting pipe 29 and other components to move horizontally synchronously.

[0047] A first scraper 211 and a second scraper 212 are fixedly arranged on both sides of the oil collecting pipe 29, respectively. The first scraper 211 and the second scraper 212 can be welded to the oil collecting pipe 29. A first feed port 213 is arranged above the connection between the first scraper 211 and the oil collecting pipe 29, and a second feed port 214 is arranged above the connection between the second scraper 212 and the oil collecting pipe 29. When the rotating driving mechanism 210 drives the oil collecting pipe 29 to rotate to the first oil scraping angle, the first scraper 211 is moved. The first scraper 211 scrapes the oil, and the end of the first scraper 211 away from the oil collecting pipe 29 is lower than the first feed port 213, and the end of the second scraper 212 away from the oil collecting pipe 29 is higher than the second feed port 214; when the rotating drive mechanism 210 drives the oil collecting pipe 29 to rotate to the second oil scraping angle, the second scraper 212 scrapes the oil, and the end of the second scraper 212 away from the oil collecting pipe 29 is lower than the second feed port 214, and the end of the first scraper 211 away from the oil collecting pipe 29 is higher than the first feed port 213.

[0048] In the present invention, the oil collecting pipe 29 has two oil scraping angles. At the first oil scraping angle, the first scraper 211 scrapes the oil, and at the second oil scraping angle, the second scraper 212 scrapes the oil. Therefore, when the oil collecting pipe 29 moves in one direction with the movable bracket 26, the oil collecting pipe 29 is at the first oil scraping angle, and when the oil collecting pipe 29 moves in another direction with the movable bracket 26, the oil collecting pipe 29 is at the second oil scraping angle. No matter which direction the oil collecting pipe 29 moves, it can scrape the oil, thereby improving the oil scraping efficiency. The oil scraping angle of the oil collecting pipe 29 is adjusted by the rotating drive mechanism 210. When the oil collecting pipe 29 moves to the end of the oil removal area 23, the rotating drive mechanism 210 drives the oil collecting pipe 29 to rotate at a set angle. When the oil collecting pipe 29 rotates, it drives the first scraper 211 and the second scraper 212 to rotate synchronously, so that one of the scrapers leaves the wastewater liquid surface and the other scraper extends into the wastewater liquid surface.

[0049] When the first scraper 211 is scraping oil, the end of the first scraper 211 away from the oil collecting pipe 29 should extend into the wastewater, so that the oil and scum on the surface of the wastewater are above the first scraper 211. When the first scraper 211 moves, the oil and scum can flow along the first scraper 211 to the first feed port 213, then enter the oil collecting pipe 29 through the first feed port 213, and finally be discharged from the end of the oil collecting pipe 29. The end of the first scraper 211 away from the oil collecting pipe 29 is lower than the first feed port 213 to prevent a large amount of wastewater from flowing into the first feed port 213. Similarly, when the second scraper 212 scrapes the oil, the end of the second scraper 212 away from the oil collecting pipe 29 should extend into the wastewater, so that the oil and scum on the surface of the wastewater are above the second scraper 212. When the second scraper 212 moves, the oil and scum can flow along the second scraper 212 to the second feed port 214, and then enter the oil collecting pipe 29 through the second feed port 214.

[0050] Figure 5 It is a schematic diagram of the first scraper 211 scraping oil, the first scraper 211 extends into the wastewater, and the second scraper 212 is above the wastewater liquid level, and the second scraper 212 is inclined; Figure 6 2 is a schematic diagram of the second scraper 212 scraping oil, the second scraper 212 extends into the wastewater, the first scraper 211 is above the wastewater level, and the first scraper 211 is inclined. Since the oil and scum flow along the upper surface of the first scraper 211 or the second scraper 212 to the first feed port 213 or the second feed port 214 when scraping the oil, the oil and scum will remain on the upper surface of the first scraper 211 or the second scraper 212. After the scraping angle of the oil collecting pipe 29 is changed, the first scraper 211 or the second scraper 212 is in an inclined state, and the oil or scum remaining on the upper surface of the first scraper 211 or the second scraper 212 will slide along the first scraper 211 or the second scraper 212 to the first feed port 213 or the second feed port 214, and will not fall into the wastewater.

[0051] The lifting frame 28 is provided with a detection element 215 for detecting the distance from the lifting frame 28 to the wastewater surface. The detection element 215 and the lifting mechanism 27 are both connected to a first controller 216. The first controller 216 adjusts the height of the lifting frame 28 according to the detection result of the detection element 215, so that when the oil collecting pipe 29 rotates to the first scraping angle, the first feed port 213 is at the same height as the wastewater surface, and when the oil collecting pipe 29 rotates to the second scraping angle, the second feed port 214 is at the same height as the wastewater surface. The detection element 215 can be an existing laser rangefinder or other element, which can detect the distance from the detection element 215 to the wastewater surface and transmit the detection signal to the first controller 216. The first controller 216 calculates the height of the wastewater surface, and then controls the operation of the lifting mechanism 27 according to the calculation result. The lifting mechanism 27 can adjust the height of the lifting frame 28 and the oil collecting pipe 29 to ensure that the oil collecting pipe 29 is at a suitable height to better scrape the oil and scum on the surface of the wastewater.

[0052] The scum may block the oil collecting pipe 29. When the oil collecting pipe 29 is blocked, in order to facilitate the cleaning of the scum in the oil collecting pipe 29, a fixed ring plate 217 is provided at one end of the oil collecting pipe 29. A slider 218 is detachably connected to the inner side of the fixed ring plate 217. The slider 218 is slidably matched with the oil collecting pipe 29. A detachable plug 219 is provided at one end of the oil collecting pipe 29. The slider 218 can be connected to the fixed ring plate 217 by screws. In normal operation, the slider 218 and the plug 219 seal both ends of the oil collecting pipe 29 to prevent the oil and scum in the oil collecting pipe 29 from being discharged from the ends thereof. After scraping the oil for a period of time, the lifting frame 28 is driven by the lifting mechanism 27 to make the oil collecting pipe 29 rise above the wastewater level, then the plug 219 is removed, a collection container is set below the port of the oil collecting pipe 29, and the connection between the slider 218 and the fixed ring plate 217 is released, and the slider 218 is pushed to move along the axial direction of the oil collecting pipe 29, so as to push out the scum and oil in the oil collecting pipe 29, and the scum and oil fall into the collection container. When the scum and oil in the oil collecting pipe 29 are cleaned up, the slider 218 is reset and reconnected to the fixed ring plate 217, and then the plug 219 is installed, and the oil can be scraped again.

[0053] In the present invention, the rotation driving mechanism 210 adopts a stepping motor, which is connected to the oil collecting pipe 29 through transmission parts such as gears and belts, and the lifting mechanism 27 is a hydraulic cylinder.

[0054] S3. The wastewater treated in step 2 is passed into the reaction tank 3. A suspended matter online monitoring device 31 and a first phosphorus content online monitoring device 32 are arranged at the entrance of the reaction tank 3. First, a suitable weight of lime is added to the reaction tank 3 according to the phosphorus content detected by the first phosphorus content online monitoring device 32. The lime reacts with the inorganic phosphorus in the wastewater to generate precipitated substances. Then, a suitable weight of flocculant is added to the reaction tank 3 according to the suspended matter content monitored by the suspended matter online monitoring device 31. The flocculant reacts with the suspended matter in the wastewater to generate large particles of solid.

[0055] The suspended matter online monitoring device 31 and the first phosphorus content online monitoring device 32 are used to monitor the phosphorus content and suspended matter content in the wastewater in real time, respectively, and existing instruments can be used. The amount of lime and flocculant added is determined according to the phosphorus content and the suspended matter content, so that the reagents can be fully utilized, waste can be avoided, and the treatment effect can be guaranteed at the same time. Lime reacts with water to generate calcium hydroxide, which can react with phosphate ions in the wastewater to generate hydroxy calcium phosphate. Hydroxy calcium phosphate is insoluble in water and can be removed by filtering and precipitation. Since the generated hydroxy calcium phosphate particles are small, lime is added first, and the generated hydroxy calcium phosphate particles are suspended in the wastewater. Then, a flocculant is added, which can condense the hydroxy calcium phosphate particles and other suspended matter into large solid particles, and the hydroxy calcium phosphate can be more fully removed in the subsequent precipitation and filtration process.

[0056] The first phosphorus content online monitoring device 32 and the suspended matter online monitoring device 31 are both connected to the second controller 33. A lime adding mechanism and a flocculant adding mechanism are arranged above the reaction tank 3. The lime adding mechanism and the flocculant adding mechanism both include a storage bin 34. A dosing port 35 is arranged at the bottom of the storage bin 34. A vertical dosing rod 36 is arranged in the storage bin 34. The top of the dosing rod 36 is connected to a dosing motor 37 through a crank slider mechanism. The lower end of the dosing rod 36 can extend into the dosing port 35 and slide with the dosing port 35. The dosing motor 37 is connected to the second controller 33.

[0057] Lime is in powder form, and the flocculant is a solid powder flocculant. When no dosing is needed, the dosing rod 36 is inserted into the dosing port 35 to close the dosing port 35. When dosing, the dosing motor 37 drives the dosing rod 36 to move up and down continuously through the crank slider mechanism. When the dosing rod 36 moves upward away from the dosing port 35, the medicine can enter the dosing port 35 and fall downward into the reaction tank 3. The dosing speed can be controlled by adjusting the frequency of the up and down movement of the dosing rod 36. In addition, the powdered material has poor fluidity and is difficult to automatically and continuously discharge. The continuously moving dosing rod 36 can drive the powdered medicine to flow and ensure the stability of the discharge.

[0058] The first phosphorus content online monitoring device 32 and the suspended matter online monitoring device 31 transmit the detection signal to the second controller 33. The second controller 33 adjusts the speed of the dosing motor 37 according to the phosphorus content and the suspended matter content, thereby controlling the dosing amount and realizing automatic adjustment of the dosing amount without manual intervention.

[0059] S4, passing the wastewater treated in step 3 into the inclined tube sedimentation tank 4 to remove large solid particles. The inclined tube sedimentation tank 4 is provided with an inclined tube assembly to promote rapid and uniform sedimentation of particles in the wastewater.

[0060] A mud discharge mechanism is provided at the bottom of the inclined tube sedimentation tank 4, and the mud discharge mechanism is used to discharge sludge. The traditional mud discharge mechanism includes a porous mud discharge pipe arranged at the bottom of the treatment tank, one end of the porous mud discharge pipe extends out of the treatment tank and is connected to the external pipeline through a flange. During the long-term operation of the sewage treatment system, sludge is easily accumulated at the flange connection, resulting in blockage of the mud discharge mechanism. When dredging, the flanges connected to each other must be removed, the external pipeline must be moved a distance, and then the sludge in the porous mud discharge pipe and the external pipeline must be cleaned. Since the external pipeline generally adopts a metal pipe, it is heavy and inconvenient to move. After dredging, it needs to be re-docking and re-installed, which is very laborious. In addition, when the flange connection is released, the sewage and sludge inside the pipeline will inevitably splash out, which is inconvenient to clean.

[0061] In order to solve the above problems, the mud discharge mechanism of the present invention includes a porous mud discharge pipe 413, a connecting piece and a sewage pipe 411, a first sewage pump 412 is arranged on the sewage pipe 411, the porous mud discharge pipe 413 is arranged at the bottom of the inclined tube sedimentation tank 4, and the connecting piece is arranged outside the inclined tube sedimentation tank 4, for connecting the porous mud discharge pipe 413 and the sewage pipe 411. The connecting piece specifically includes a connecting body 41 with an inner cavity, the connecting body 41 is provided with a sewage inlet side wall 42 and a sewage outlet side wall 43, the sewage inlet side wall 42 and the sewage outlet side wall 43 are parallel to each other, and a sewage inlet port 44 is provided at the upper part of the sewage inlet side wall 42, a lower sewage cleaning port 45 is provided at the lower part of the sewage inlet side wall 42, an upper sewage cleaning port 46 is provided at the upper part of the sewage outlet side wall 43, and a sewage outlet port 47 is provided at the lower part of the sewage outlet side wall 43, the sewage inlet port 44 is coaxial with the upper sewage cleaning port 46, and the sewage outlet 47 is coaxial with the lower sewage cleaning port 45; both the upper sewage cleaning port 46 and the lower sewage cleaning port 45 are provided with an openable and closable sewage cleaning door 48; a sewage outlet 49 is provided at the bottom of the connecting body 41, and an openable and closable switch member 410 is provided at the sewage outlet 49; the sewage inlet 44 is connected to a porous mud discharge pipe 413, and the sewage outlet 47 is connected to a sewage discharge pipe 411.

[0062] The connector 41 has a certain cavity, which can play the role of transferring sludge. Specifically, the shape of the connector 41 can be cylindrical, preferably a rectangular parallelepiped. The connector 41 can be welded by corrosion-resistant metal plates, for example, stainless steel plates. The sewage inlet 44 is used to connect the porous mud discharge pipe 413, and the sewage outlet 47 is used to connect the sewage pipe 411. Specifically, the sewage inlet 44 is connected to the porous mud discharge pipe 413 through a flange, and the sewage outlet 47 is connected to the sewage pipe 411 through a flange. The sewage outlet 47 is arranged below the sewage inlet 44, which is conducive to the sludge entering the sewage pipe 411. After the sewage inlet 44 is connected to the porous mud discharge pipe 413, and the sewage outlet 47 is connected to the sewage pipe 411, the sludge at the bottom of the porous mud discharge pipe 413 can enter the sewage pipe 411 through the connector 41. The upper sewage cleaning port 46 is used to clear the sewage inlet 44, and the lower sewage cleaning port 45 is used to clear the sewage outlet 47. Since the sewage inlet 44 is coaxial with the upper sewage cleaning port 46, and the sewage outlet 47 is coaxial with the lower sewage cleaning port 45, after the dredging tool is inserted into the connecting body 41 through the upper sewage cleaning port 46, it can be directly inserted into the sewage inlet 44, thereby cleaning the sludge in the sewage inlet 44. Similarly, after the dredging tool is inserted into the connecting body 41 through the lower sewage cleaning port 45, it can be directly inserted into the sewage outlet 47, thereby cleaning the sludge in the sewage outlet 47. During normal operation, the sewage cleaning door 48 closes the upper sewage cleaning port 46 and the lower sewage cleaning port 45 to prevent the sludge from being discharged through the upper sewage cleaning port 46 and the lower sewage cleaning port 45.

[0063] Since sludge will accumulate in the connecting body 41, the sludge in the connecting body 41 must be discharged first during dredging. When dredging, the switch 410 is opened so that the sewage outlet 49 is opened, and the sludge in the connecting body 41 can be discharged downward through the sewage outlet 49. At the same time, the sludge in the sewage inlet 44 and the sewage outlet 47 can be discharged through the sewage outlet 49 after being cleaned to the connecting body 41.

[0064] The desilting process of the present desilting mechanism is as follows: when the sewage inlet 44 and the sewage outlet 47 are clogged with silt, the switch 410 is first opened to open the sewage outlet 49, and the sewage and sludge inside the connector are automatically discharged through the sewage outlet 49, so as to facilitate the subsequent desilting operation. After the sewage and sludge inside the connector are completely discharged, the cleaning door 48 at the upper sewage outlet 46 and the lower sewage outlet 45 is opened. Since the sewage inlet 44 is coaxial with the upper sewage outlet 46, and the sewage outlet 47 is coaxial with the lower sewage outlet 45, the desilting tool can be inserted from the upper sewage outlet 46 and the lower sewage outlet 45, so that the desilting tool passes through the inner cavity of the connector and extends into the sewage inlet 44 and the sewage outlet 47, so that the sludge clogged in the sewage inlet 44 and the sewage outlet 47 can be scraped into the connector, and the sludge is then discharged from the sewage outlet 49. After dredging is completed, the switch 410 is closed, and the cleaning door 48 at the upper cleaning port 46 and the lower cleaning port 45 is reclosed. Before dredging, the present invention can set a collection device under the sewage outlet 49 to collect sludge and sewage to prevent sewage from splashing. During dredging, there is no need to remove flanges and other connectors, which makes the operation more convenient and labor-saving.

[0065] The sewage cleaning door 48 can be connected to the connecting body 41 by various existing connection methods. For example, the top of the sewage cleaning door 48 is connected to the connecting body 41 by a hinge, and the lower part is connected to the connecting body 41 by a lock. Preferably, the sewage cleaning door 48 is connected to the connecting body 41 by multiple bolts. In order to improve the sealing performance and prevent sewage leakage, a sealing gasket is provided between the sewage cleaning door 48 and the connecting body 41. The sealing gasket can be an elastic gasket such as a rubber gasket.

[0066] The switch member 410 may also adopt the structure of a switch door. For the convenience of operation, the switch member 410 may be a drain valve.

[0067] S5. Pass the wastewater treated in step 4 into a deep filter tank 5. The deep filter tank 5 is provided with a phosphorus adsorption filler layer 52 and a plurality of filter material layers 51. The phosphorus adsorption filler layer 52 adsorbs residual phosphorus in the wastewater, and the filter material layer 51 filters out small solid particles in the wastewater.

[0068] The filter material layer 51 includes a first quartz sand filter layer, a second quartz sand filter layer and a third quartz sand filter layer which are arranged in sequence from bottom to top. The particle sizes of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer gradually decrease. The upper surfaces of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer are all provided with a backwash pipe network 53. A second sewage pump 54 is provided at the bottom of the deep filter tank 5. The phosphorus adsorption filler layer 52 is arranged above the third quartz sand filter layer.

[0069] Wastewater enters the deep filter tank 5 from the bottom of the deep filter tank 5, and then flows upward. After being filtered through the first quartz sand filter layer, the second quartz sand filter layer, and the third quartz sand filter layer in sequence, the solid particles involved in the water are further reduced. At the same time, the phosphorus adsorption filler layer 52 adsorbs the residual phosphorus to further reduce the phosphorus content. The first quartz sand filter layer, the second quartz sand filter layer, and the third quartz sand filter layer are backwashed regularly through the backwashing pipe network 53 to prevent the first quartz sand filter layer, the second quartz sand filter layer, and the third quartz sand filter layer from being blocked. The sludge at the bottom of the deep filter tank 5 is discharged through the second sewage pump 54.

[0070] S6, the wastewater treated in step S5 is passed into the clean water tank 6, and a second online phosphorus content monitoring device 61 is set at the outlet of the clean water tank 6. After the water quality test is qualified, the wastewater is discharged. The clean water tank 6 is used to store the treated wastewater, and the second online phosphorus content monitoring device 61 and the first online phosphorus content monitoring device 32 are the same equipment, which monitors the effluent in real time to ensure that the discharge meets the standard.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating wastewater with high phosphorus content, high turbidity and high oil content, characterized in that: include S1. Using a grit chamber (1) to remove grit from wastewater; S2, the wastewater treated in step 1 is passed into an oil removal and decolorization tank (2) to remove pigments and oil in the wastewater; The inner cavity of the deoiling and decolorizing tank (2) is divided into a dosing area (22) and an deoiling area (23) by a vertical partition (21); a water inlet channel (24) connecting the dosing area (22) and the deoiling area (23) is provided at the bottom of the partition (21); an aeration mechanism (25) is provided at the bottom of the deoiling area (23); and an oil scraping mechanism is provided at the top of the deoiling area (23); The oil scraping mechanism comprises a movable bracket (26), a lifting mechanism (27) is arranged on the movable bracket (26), the lifting mechanism (27) is connected to a lifting frame (28), and a horizontal oil collecting pipe (29) and a rotation driving mechanism (210) for driving the oil collecting pipe (29) to rotate are arranged on the lifting frame (28); A first scraper (211) and a second scraper (212) are fixedly arranged on both sides of the oil collecting pipe (29), respectively; a first feed port (213) is arranged above the connection between the first scraper (211) and the oil collecting pipe (29), and a second feed port (214) is arranged above the connection between the second scraper (212) and the oil collecting pipe (29); when the rotation drive mechanism (210) drives the oil collecting pipe (29) to rotate to a first oil scraping angle, the first scraper (211) scrapes the oil, and the first scraper (211) One end away from the oil collecting pipe (29) is lower than the first feed port (213), and one end of the second scraper (212) away from the oil collecting pipe (29) is higher than the second feed port (214); when the rotary drive mechanism (210) drives the oil collecting pipe (29) to rotate to a second oil scraping angle, the second scraper (212) scrapes the oil, and one end of the second scraper (212) away from the oil collecting pipe (29) is lower than the second feed port (214), and one end of the first scraper (211) away from the oil collecting pipe (29) is higher than the first feed port (213); S3, passing the wastewater treated in step 2 into a reaction tank (3), setting a suspended matter online monitoring device (31) and a first phosphorus content online monitoring device (32) at the entrance of the reaction tank (3), first adding a suitable weight of lime to the reaction tank (3) according to the phosphorus content detected by the first phosphorus content online monitoring device (32), the lime reacting with the inorganic phosphorus in the wastewater to generate a precipitate, then adding a suitable weight of flocculant to the reaction tank (3) according to the suspended matter content monitored by the suspended matter online monitoring device (31), the flocculant reacting with the suspended matter in the wastewater to generate large particles of solid; S4, passing the wastewater treated in step 3 into the inclined tube sedimentation tank (4) to remove large particles of solids; S5, passing the wastewater treated in step 4 into a deep filter tank (5), wherein a phosphorus adsorption filler layer (52) and a plurality of filter material layers (51) are provided in the deep filter tank (5), wherein the phosphorus adsorption filler layer (52) adsorbs residual phosphorus in the wastewater, and the filter material layer (51) filters out small solid particles in the wastewater; S6. The wastewater treated in step S5 is passed into a clean water tank (6). A second phosphorus content online monitoring device (61) is installed at the outlet of the clean water tank (6). After the water quality test is qualified, the wastewater is discharged.

2. The method for treating high-phosphorus, high-turbidity and high-oil wastewater according to claim 1, characterized in that: In step S2, Wastewater enters the dosing zone (22) from the top of the dosing zone (22), a decolorizing agent is added to the dosing zone (22), and the wastewater enters the oil removal zone (23) through the wastewater inlet channel (24). Under the action of the aeration mechanism (25), the decolorizing agent and the wastewater are uniformly mixed, and the scum and oil in the wastewater float to the surface of the wastewater, and the oil scraping mechanism collects the scum and oil.

3. The method for treating high-phosphorus, high-turbidity and high-oil wastewater according to claim 2, characterized in that: The lifting frame (28) is provided with a detection element (215) for detecting the distance between the lifting frame (28) and the wastewater liquid surface. The detection element (215) and the lifting mechanism (27) are both connected to a first controller (216). The first controller (216) adjusts the height of the lifting frame (28) according to the detection result of the detection element (215), so that when the oil collecting pipe (29) rotates to a first oil scraping angle, the first feed port (213) and the wastewater liquid surface are at the same height, and when the oil collecting pipe (29) rotates to a second oil scraping angle, the second feed port (214) and the wastewater liquid surface are at the same height.

4. The method for treating high-phosphorus, high-turbidity and high-oil wastewater according to claim 3, characterized in that: A fixed ring plate (217) is provided at one end of the oil collecting pipe (29), a sliding block (218) is detachably connected to the inner side of the fixed ring plate (217), the sliding block (218) is slidably matched with the oil collecting pipe (29), and a detachable plug (219) is provided at one end of the oil collecting pipe (29).

5. The method for treating wastewater containing high phosphorus, high turbidity and high oil content according to claim 3, characterized in that: The rotation drive mechanism (210) is a stepping motor, and the lifting mechanism (27) is a hydraulic cylinder.

6. The method for treating wastewater with high phosphorus content, high turbidity and high oil content according to claim 1, characterized in that: In step S3, the first phosphorus content online monitoring device (32) and the suspended matter online monitoring device (31) are both connected to a second controller (33), a lime adding mechanism and a flocculant adding mechanism are arranged above the reaction tank (3), the lime adding mechanism and the flocculant adding mechanism both comprise a storage bin (34), a dosing port (35) is arranged at the bottom of the storage bin (34), a vertical dosing rod (36) is arranged in the storage bin (34), the top of the dosing rod (36) is connected to a dosing motor (37) via a crank slider mechanism, the lower end of the dosing rod (36) can extend into the dosing port (35) and slidably cooperate with the dosing port (35), and the dosing motor (37) is connected to the second controller (33); The first phosphorus content online monitoring device (32) and the suspended matter online monitoring device (31) transmit detection signals to the second controller (33), and the second controller (33) adjusts the rotation speed of the dosing motor (37) according to the phosphorus content and the suspended matter content, thereby controlling the dosing amount.

7. The method for treating wastewater containing high phosphorus, high turbidity and high oil content according to claim 1, characterized in that: In step S5, the filter material layer (51) comprises a first quartz sand filter layer, a second quartz sand filter layer and a third quartz sand filter layer which are arranged in sequence from bottom to top, the particle sizes of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer gradually decrease, the upper surfaces of the first quartz sand filter layer, the second quartz sand filter layer and the third quartz sand filter layer are all provided with a backwashing pipe network (53), and the bottom of the deep filter tank (5) is provided with a second sewage pump (54); the phosphorus adsorption filler layer (52) is arranged above the third quartz sand filter layer.

8. The method for treating wastewater containing high phosphorus, high turbidity and high oil content according to claim 1, characterized in that: A mud discharge mechanism is provided at the bottom of the inclined tube sedimentation tank (4).

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