CN107055944B

CN107055944B - Emulsion paint wastewater treatment system and method

Info

Publication number: CN107055944B
Application number: CN201710108377.2A
Authority: CN
Inventors: 张国辉; 杨鸿鹰; 王丽莉; 王玲燕; 任蕊; 张玉娟
Original assignee: Shaanxi Research Design Institute of Petroleum and Chemical Industry
Current assignee: Shaanxi Research Design Institute of Petroleum and Chemical Industry
Priority date: 2017-02-27
Filing date: 2017-02-27
Publication date: 2023-05-16
Anticipated expiration: 2037-02-27
Also published as: CN107055944A

Abstract

The invention discloses a latex paint wastewater treatment system and a method, wherein the wastewater treatment system comprises an artificial grid well, a grit chamber, an open type electronic flocculator, an IC anaerobic reactor and an A/O (anaerobic/anoxic/oxic) ₂ The device comprises a biochemical reactor, an inclined tube sedimentation tank, a sludge tank, a filter press, a ferromanganese filter, a vertical electronic flocculator, a lifting pump and a sedimentation separation tank which are connected. When in use, the emulsion paint wastewater enters a grit chamber to remove particle fillers after removing particle impurities through an artificial grid well, then flows into an open type electronic flocculator to demulsifie and delaminate and precipitate, and then automatically flows into an A/O (anaerobic/anoxic/oxic) ₂ The biochemical reactor carries out biochemical treatment, the clean water after the sludge of biochemical effluent is removed by the inclined tube sedimentation tank enters the vertical electronic flocculator for further electroflocculation treatment, and the effluent is recycled or discharged after being filtered. The invention can efficiently demulsify, remove COD, suspended matters and refractory substances in sewage, improve biodegradability, reach emission or recycling standard after biochemical treatment, and has the advantages of high treatment efficiency, stable water output and the like.

Description

Emulsion paint wastewater treatment system and method

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a latex paint wastewater treatment system and method.

Background

In recent years, the amount of latex paint has increased year by year, and thus latex enterprises of various sizes flower throughout the country. The problems of waste water treatment in emulsion paint production are not paid attention to due to the lag of the production process and the weakness of environmental protection consciousness.

The emulsion paint wastewater is mainly produced during flushing production equipment, paint mixing cylinders, paint barrels, pipelines and floors, and mainly contains chemical substances such as emulsion, emulsifying agent, auxiliary agent, color paste, pigment and filler and the like. In the emulsion paint production process, the wastewater quantity is smaller but is discharged intermittently, and the impact load is higher; the COD concentration of the latex paint wastewater is high and sometimes reaches 10-30 g/L; the turbidity is high, the chromaticity is large, and suspended matters are as high as 80000mg/L; emulsion paint wastewater forms stable colloid by organic and inorganic pigment, inorganic filler and a small amount of auxiliary agent, and emulsion breaking is very difficult; the biodegradability is extremely poor, and substances which are difficult to biodegrade and toxic substances with bacteriostasis function exist, so that the normal activity of bacterial colonies in the biochemical treatment process is affected. At present, emulsion paint wastewater is mainly treated by adding demulsifier, flocculant, pressurized air floatation and biochemical treatment, but the emulsion paint wastewater treatment process is difficult to reach the standard due to the fact that water suspended matters are high, COD is high, degradation is difficult, fluctuation is large, demulsification is difficult, the dosage of the agent is large, treatment is very difficult, and the emulsion paint wastewater treatment process needs to be improved.

Disclosure of Invention

The invention aims to solve the technical problems of the existing latex paint wastewater treatment process, and provides a latex paint wastewater treatment system and a latex paint wastewater treatment method which can effectively demulsify, remove COD, suspended matters and refractory substances in sewage, improve biodegradability and reach the discharge or recycling standard after biochemical treatment.

The latex paint wastewater treatment system of the invention is: an artificial grille well is arranged at the water inlet of the grit chamber, the water outlet of the grit chamber is communicated with the water inlet of the open type electronic flocculator through a pipeline, the water outlet of the open type electronic flocculator is communicated with a sedimentation separation tank, the sedimentation separation tank is communicated with an IC anaerobic reactor through a lifting pump arranged on the pipeline, and the IC anaerobic reactor is communicated with the A/O (anaerobic/anaerobic) device ₂ The biochemical reactor is communicated with the A/O ₂ The biochemical reactor is sequentially composed of an anoxic reaction tank, a first-stage aerobic reaction tank and a second-stage aerobic reaction tank, wherein the water outlet of the second-stage aerobic reaction tank is communicated with a tube sedimentation tank through a pipeline, one outlet of the tube sedimentation tank is communicated with a sludge tank, the other outlet of the tube sedimentation tank is communicated with a vertical electronic flocculator, and the sludge tank is provided with a plurality of anaerobic reaction tanksThe vertical electronic flocculator is connected with the filter press, and is communicated with the ferromanganese filter.

The open type electronic flocculation device comprises an electronic flocculation reactor, wherein one end of the electronic flocculation reactor is arranged in the middle of the right side wall of the primary sedimentation tank, the other end of the electronic flocculation reactor is arranged in the middle of the left side wall of the buffer tank, water distribution holes are uniformly distributed in the lower portion of the side wall of the joint of the primary sedimentation tank and the electronic flocculation reactor, the aperture of each water distribution hole is 10-30 mm, an opening is formed in the upper portion of the side wall of the joint of the electronic flocculation reactor and the buffer tank, and the primary sedimentation tank and the buffer tank are made of any one of polyamide, polyethylene, polypropylene, polyurethane and polycarbonate.

The electric flocculation reactor is formed by connecting a rectifier for converting alternating current into direct current, a double-circuit circulation time relay and electrode groups, wherein the output end of the rectifier is connected with the input end of the electrode groups, the double-circuit circulation time relay is connected with the rectifier, and the number of the electrode groups is 1-5.

The structure of the electrode group is as follows: the two ends of the two strip-shaped front insulating frameworks are fixedly connected through insulating screws to form an electrode plate base, an even number of L-shaped clamping grooves are formed in the inner sides of the two front insulating frameworks at equal intervals along the length direction, the first rectangular electrode plates and the second rectangular electrode plates are inserted in the L-shaped clamping grooves on the electrode plate base in a staggered mode, the first rectangular electrode plates and the second rectangular electrode plates are connected with a rectifier through wires, the polarities of the first rectangular electrode plates and the second rectangular electrode plates are opposite, all the first rectangular electrode plates are connected through first conductors, all the second rectangular electrode plates are connected through second conductors, two rear insulating frameworks are symmetrically arranged at the rear ends of the first rectangular electrode plates and the second rectangular electrode plates, an even number of straight clamping grooves are formed in the rear insulating frameworks at equal intervals along the length direction, and are matched with the first rectangular electrode plates and the second rectangular electrode plates, and the two ends of the two rear insulating frameworks are fixedly connected through the insulating screws.

The distance between the first rectangular electrode plate and the second rectangular electrode plate is 10-30 mm, and the thickness of the first rectangular electrode plate and the second rectangular electrode plate is 2-6 mm.

The shell, the front insulating framework, the rear insulating framework and the insulating screw rod of the open type electronic flocculator are made of any one of polyamide, polyethylene, polypropylene, polyurethane and polycarbonate, and the first rectangular electrode plate and the second rectangular electrode plate are aluminum plates.

The vertical electronic flocculator comprises: the bottom one side of insulating casing is provided with the inlet tube, the opposite side is provided with the blow off pipe, be provided with the outlet pipe on the upper end lateral wall of insulating casing, the opening part of insulating casing is provided with the upper cover plate, be provided with first electrode terminal and second electrode terminal on the upper cover plate, the one end of first electrode terminal and second electrode terminal stretches into in the insulating casing, it has first arc electrode plate and second arc electrode plate to be arranged in turn from the top down equidistantly on first electrode terminal and the second electrode terminal that lie in the insulating casing, first arc electrode plate passes through the metal bolt and links to each other with first electrode terminal, link to each other with second arc electrode terminal through insulation unit, second arc electrode plate passes through the metal nut and links to each other with second electrode terminal, link to each other with first electrode terminal through insulation unit, insulation unit constitute by plastic base and plastic mat.

The geometric shapes of the first arc-shaped electrode plate and the second arc-shaped electrode plate are figures formed by major arcs and chords corresponding to the major arcs, and the straight edges of the first arc-shaped electrode plate and the straight edges of the second arc-shaped electrode plate are positioned on two opposite sides.

The first arc electrode plate and the second arc electrode plate are aluminum plates, and the first electrode binding post and the second electrode binding post are metal screw rods.

The method for treating latex paint wastewater by adopting the treatment system comprises the following steps: removing particulate impurities from latex paint wastewater through an artificial grid well, flowing into a sand setting tank, removing particulate fillers in the latex paint wastewater through the sand setting tank, flowing into a primary sedimentation tank of an open type electronic flocculation device, entering into an electronic flocculation reactor after primary sedimentation, demulsifying the latex wastewater through the action of an electric field, and further layering and precipitating the demulsified latex wastewater through a buffer tank and then entering into a sedimentation separation tank; sewage in the sedimentation separation tank enters the IC anaerobic reactor through the lift pump, and after being treated by the IC anaerobic reactor, the sewage automatically flows into the anoxic reaction tank and the first-stage aerobic reaction tank in sequenceA/O is carried out in a second-stage aerobic reaction tank ₂ Biochemical treatment, wherein the effluent of the second-stage aerobic reaction tank enters a tube sedimentation tank, water in the tube sedimentation tank is subjected to sedimentation separation, sludge enters a sludge tank, is subjected to filter pressing by a filter press and is transported outwards, clear water enters a vertical electronic flocculator, and the effluent of the vertical electronic flocculator is filtered by a ferro-manganese filter and is recycled or discharged.

The beneficial effects of the invention are as follows:

1. in the treatment system, the primary sedimentation tank, the buffer tank, the front insulating framework, the rear insulating framework and the insulating screw rods of the open type electronic flocculator are made of insulating materials such as polyamide, polyethylene, polypropylene, polyurethane and polycarbonate, the electricity consumption loss is small, the first rectangular electrode plate and the second rectangular electrode plate form an electrode group in an inserting mode, the replacement is convenient, the current intensity of the first rectangular electrode plate and the second rectangular electrode plate is changed through the rectifier, the positive polarity and the negative polarity of the first rectangular electrode plate and the second rectangular electrode plate are changed through the double-circuit circulation time relay, and the polarization or scaling of the first rectangular electrode plate and the second rectangular electrode plate can be prevented.

2. In the treatment system, the insulating shell of the vertical electronic flocculator reduces the electric energy loss and improves the working efficiency; the first arc electrode plates and the second arc electrode plates are sequentially and alternately arranged on the first electrode binding post and the second electrode binding post in the insulating shell at equal intervals from top to bottom, and the straight edge of the first arc electrode plate and the straight edge of the second arc electrode plate are positioned on two opposite sides, so that an S-shaped water flow channel is formed in the insulating shell, water flow enters the insulating shell from a water inlet pipe and passes through the S-shaped water flow channel formed by the first arc electrode plates and the second arc electrode plates from bottom to top, the contact area of water flow and the electrode plates is increased, the reaction time is prolonged, and the treatment efficiency is improved; meanwhile, the first arc electrode plate and the second arc electrode plate are connected with the first electrode binding post and the second electrode binding post through bolts, the distance is adjusted, the electrode plates are convenient to replace, and the manufacturing cost is low.

3. In the treatment system of the invention, the IC anaerobic reactor is a third-generation anaerobic reactor developed after an anaerobic digestion tank and UASB, and isThe most advanced anaerobic treatment technology in the world at present has the advantages of high volume load rate, short hydraulic retention time, strong impact load resistance, short starting period, low capital investment and small occupied area. The invention uses IC anaerobic reactor and traditional A/O ₂ The activated sludge method is combined, so that the impact load is strong and the water outlet is stable.

4. According to the invention, the emulsion paint wastewater is treated by adopting the treatment system and method of the open type electronic flocculator, the biochemical treatment and the vertical type electronic flocculator, and the wastewater can be efficiently demulsified and flocculated without adding a medicament, so that COD, suspended matters and refractory substances in the wastewater are effectively removed, the effluent reaches the discharge or recycling standard, the problem of emulsion paint wastewater treatment is solved, the biodegradability of the emulsion paint wastewater is greatly improved, and the advantages of high treatment efficiency, stable growth of effluent and the like are achieved.

Drawings

FIG. 1 is a schematic diagram of the connection of the latex paint wastewater treatment system of the present invention.

Fig. 2 is a schematic view of the structure of the open type electronic flocculator 3 of fig. 1.

Fig. 3 is a top view of fig. 2.

FIG. 4 is a schematic diagram of the structure of the electroflocculation reactor 3-2 in FIG. 2.

Fig. 5 is a schematic view of the structure of the electrode group 3-2-3 in fig. 4.

Fig. 6 is a top view of fig. 5.

Fig. 7 is a right side view of fig. 5.

Fig. 8 is a schematic structural view of the first rectangular electrode plate 3-2-3-2 in fig. 6.

Fig. 9 is a schematic structural view of the second rectangular electrode plate 3-2-3-4 in fig. 6.

Fig. 10 is a structural view of the vertical type electronic flocculator 12.

Fig. 11 is a top view of the first arcuate electrode plate 12-6 of fig. 10.

Fig. 12 is a top view of the second arcuate electrode plate 12-7 of fig. 10.

Fig. 13 is a schematic view of the structure of the insulating unit 12-9 in fig. 10.

Detailed Description

As shown in fig. 1, the latex paint wastewater treatment system of the embodiment is formed by connecting an artificial grid well 1, a grit chamber 2, an open type electronic flocculator 3, an IC anaerobic reactor 4, an anoxic reaction tank 5, a first-stage aerobic reaction tank 6, a second-stage aerobic reaction tank 7, an inclined tube sedimentation tank 8, a sludge tank 9, a filter press 10, a ferromanganese filter 11, a vertical type electronic flocculator 12, a lift pump 13 and a sedimentation separation tank 14.

An artificial grille well 1 is arranged at the water inlet of the grit chamber 2, the artificial grille well 1 is composed of a coarse grille and a fine grille, wherein the coarse grille can remove large particle impurities in latex paint wastewater, such as: the fine grid can remove smaller particle impurities in latex paint wastewater by using wood, plastic bags and the like. The grit chamber 2 can be of a horizontal flow type, an aeration type and a rotational flow type, and is mainly used for removing sand grains with the grain size of more than 0.2mm in latex paint wastewater. The water outlet of the grit chamber 2 is communicated with an open type electronic flocculator 3 through a pipeline. The open type electronic flocculator 3 is communicated with a sedimentation separation tank 14 through a pipeline, and the sedimentation separation tank 14 is communicated with the IC anaerobic reactor 4 through a lifting pump 13 arranged on the pipeline. The IC anaerobic reactor 4 is a third-generation anaerobic reactor developed after an anaerobic digestion tank and UASB, is the most advanced anaerobic treatment technology worldwide at present, has high volume load rate, short hydraulic retention time, strong impact load resistance, short starting period and small capital investment and occupied area. IC anaerobic reactor 4 and A/O ₂ The biochemical reactor is connected with the A/O ₂ The biochemical reactor is formed by communicating an anoxic reaction tank 5, a first-stage aerobic reaction tank 6 and a second-stage aerobic reaction tank 7 in sequence, wherein a water outlet of the second-stage aerobic reaction tank 7 is communicated with an inclined tube sedimentation tank 8 through a pipeline, one outlet of the inclined tube sedimentation tank 8 is communicated with a sludge tank 9, the other outlet of the inclined tube sedimentation tank is communicated with a vertical electronic flocculator 12, the sludge tank 9 is communicated with a filter press 10, and the vertical electronic flocculator 12 is communicated with a ferromanganese filter 11.

As shown in fig. 2 and 3, the open type electronic flocculation device 3 of the present embodiment is formed by connecting an initial precipitation tank 3-1, an electronic flocculation reactor 3-2 and a buffer tank 3-3. One end of the electric flocculation reactor 3-2 is arranged in the middle of the right side wall of the primary sedimentation tank 3-1, the other end of the electric flocculation reactor is arranged in the middle of the left side wall of the buffer tank 3-3, water distribution holes which are uniformly distributed are processed at the lower part of the side wall at the joint of the primary sedimentation tank 3-1 and the electric flocculation reactor 3-2, the aperture of the water distribution holes is 20mm, an opening is processed at the upper part of the side wall at the joint of the electric flocculation reactor 3-2 and the buffer tank 3-3, and the electric flocculation reactor 3-2 is communicated with the external environment. The primary sedimentation tank 3-1 and the buffer tank 3-3 are made of insulating materials such as polyamide, polyethylene, polypropylene, polyurethane, polycarbonate and the like, so that the electric energy loss is reduced, and the utilization rate is improved.

As shown in FIG. 4, the electric flocculation reactor 3-2 of the embodiment is formed by connecting a rectifier 3-2-1, a two-way circulation time relay 3-2-2 and electrode groups 3-2-3, wherein the rectifier 3-2-1 is used for converting alternating current into direct current, the output end of the rectifier 3-2-1 is connected with the input end of the electrode group 3-2-3, the two-way circulation time relay 3-2-2 is connected with the rectifier 3-2-1, the number of the electrode groups 3-2-3 is 4, and the electrode groups 3-2-3 of the 4 groups are connected in series.

As shown in fig. 5, 6, 7, 8, 9, the electrode group 3-2-3 of the present embodiment is formed by connecting a rear insulating frame 3-2-3-1, a first rectangular electrode plate 3-2-3-2, a first conductor 3-2-3-3, a second rectangular electrode plate 3-2-3-4, an insulating screw 3-2-3-5, a second conductor 3-2-3-6, and a front insulating frame 3-2-3-7.

The two ends of the two strip-shaped front insulating frameworks 3-2-3-7 are fixedly connected through insulating screws 3-2-3-5 to form an electrode plate base, 40L-shaped clamping grooves are formed in the inner side of the two front insulating frameworks 3-2-3-7 at equal intervals along the length direction, the first rectangular electrode plates 3-2-3-2 and the second rectangular electrode plates 3-2-3-4 are inserted in the L-shaped clamping grooves on the electrode plate base in a staggered mode, the first rectangular electrode plates 3-2-3-2 and the second rectangular electrode plates 3-2-3-4 are aluminum plates, the distance between the first rectangular electrode plates 3-2 and the second rectangular electrode plates 3-2-3-4 is 20mm, and the thickness of the first rectangular electrode plates 3-2-3-2 and the second rectangular electrode plates 3-2-3-4 is 4mm. The first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 can be assembled or replaced according to requirements, and the replacement is convenient. The first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 are connected with the rectifier 3-2-1 through wires, the polarities of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 are opposite, all the first rectangular electrode plates 3-2-3-2 are connected by the first electric conductor 3-2-3-3, all the second rectangular electrode plates 3-2-3-4 are connected by the second electric conductor 3-2-3-6, the current intensity of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 is changed through the rectifier 3-2-1, and the positive and negative polarities of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 are changed through the double-circuit circulation time relay 3-2, so that the polarization or scaling of the first rectangular electrode plate 3-2-3-2-3-4 and the second rectangular electrode plate 3-2-3-4 can be prevented. Two rear insulating frameworks 3-2-3-1 are symmetrically arranged at the rear ends of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4, 40 straight clamping grooves are processed on the rear insulating frameworks 3-2-3-1 at equal intervals along the length direction and are matched with the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4, and two ends of the two rear insulating frameworks 3-2-3-1 are fixedly connected through insulating screws 3-2-3-5 and used for fixing the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4. The rectifier 3-2-1 converts alternating current into direct current, is connected to the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 through a wire, and in order to prevent electrode polarization or scaling of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4, the positive and negative poles of the direct current are switched through the double-circuit circulation time relay 3-2, the first rectangular electrode plate 3-2-3-2 is a positive pole plate, the second rectangular electrode plate 3-2-3-4 is a negative pole plate, after a set time is reached, the double-circuit circulation time relay 3-2-2 performs a switching circuit, so that the first rectangular electrode plate 3-2-3-2 is a negative pole plate, the second rectangular electrode plate 3-2-3-4 is a positive pole plate, the service lives of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 are prolonged, and the treatment efficiency is improved. In the embodiment, the front insulating framework 3-2-3-7, the rear insulating framework 3-2-3-1 and the insulating screw 3-2-3-5 are made of insulating materials such as polyamide, polyethylene, polypropylene, polyurethane, polycarbonate and the like.

As shown in fig. 10, 11 and 12, the vertical electronic flocculator 12 of this embodiment is formed by connecting an insulating housing 12-1, a first electrode terminal 12-2, a second electrode terminal 12-3, an upper cover plate 12-4, a water outlet pipe 12-5, a first arc electrode plate 12-6, a second arc electrode plate 12-7, a metal nut 12-8, an insulating unit 12-9, a drain pipe 12-10 and a water inlet pipe 12-11.

The insulating shell 12-1 is a plastic cylinder, a water inlet pipe 12-11 is arranged on one side of the bottom end of the insulating shell 12-1, a drain pipe 12-10 is arranged on the other side of the bottom end of the insulating shell 12-1, a water outlet pipe 12-5 is machined on the side wall of the upper end of the insulating shell 12-1, an upper cover plate 12-4 is fixedly connected to the opening of the insulating shell 12-1 through a threaded fastening connecting piece, a first electrode binding post 12-2 and a second electrode binding post 12-3 are fixedly connected to the upper cover plate 12-4 through a threaded fastening connecting piece, the first electrode binding post 12-2 and the second electrode binding post 12-3 are all metal screws, and one ends of the first electrode binding post 12-2 and the second electrode binding post 12-3 extend into the insulating shell 12-1. The first arc electrode plate 12-6 and the second arc electrode plate 12-7 are aluminum plates, the geometric shapes of the first arc electrode plate 12-6 and the second arc electrode plate 12-7 are patterns formed by major arcs and strings corresponding to the major arcs, two identical electrode holes are formed in the centers of the first arc electrode plate 12-6 and the second arc electrode plate 12-7, the hole spacing between the two electrode holes is equal to the center distance between the first electrode binding post 12-2 and the second electrode binding post 12-3, the first arc electrode plate 12-6 is sleeved on the first electrode binding post 12-2 and the second electrode binding post 12-3 through the two electrode holes, the metal nuts 12-8 are fixedly connected with the first electrode binding post 12-2, the insulating units 12-9 are fixedly connected with the second electrode binding post 12-3 through the two electrode holes, and the insulating units 12-9 are fixedly connected with the first electrode binding post 12-2, and the insulating units 12-9 are composed of plastic bases 12-9-1 and plastic binding posts 12-13 (see figure). The first arc electrode plates 12-6 and the second arc electrode plates 12-7 are alternately arranged on the first electrode binding post 12-2 and the second electrode binding post 12-3 which extend into the insulating shell 12-1 from top to bottom at equal intervals, the straight edges of the first arc electrode plates 12-6 and the straight edges of the second arc electrode plates 12-7 are positioned on two opposite sides, so that an S-shaped water flow channel is formed in the insulating shell 12-1, water flows from the water inlet pipe 12-11 into the insulating shell 12-1, and the S-shaped water flow channel formed by the first arc electrode plates 12-6 and the second arc electrode plates 12-7 from bottom to top increases the contact area of water flow and electrode plates, prolongs the reaction time and improves the treatment efficiency.

The wastewater treatment system is adopted to treat certain emulsion paint wastewater, and the specific method is as follows:

removing particulate impurities from emulsion paint wastewater through an artificial grid well 1, flowing into a grit chamber 2, removing particulate fillers in the emulsion paint wastewater through the grit chamber 2, flowing into a primary sedimentation tank 3-1 of an open type electronic flocculator 3, performing primary sedimentation, then entering into an electronic flocculation reactor 3-2, demulsifying the emulsion wastewater through the action of an electric field, and further layering and precipitating the demulsified emulsion wastewater through a buffer tank 3-3, and then entering into a sedimentation separation tank 14; sewage in the sedimentation separation tank 14 enters the IC anaerobic reactor 4 through the lifting pump 13, and COD in the sewage is reduced, so that the purpose of subsequent biochemistry is achieved. The wastewater treated by the IC anaerobic reactor 4 automatically flows into the anoxic reaction tank 5, the first-stage aerobic reaction tank 6 and the second-stage aerobic reaction tank 7 in sequence to perform A/O ₂ Biochemical treatment to further remove COD to reach the standard of emission and reuse. And the mixed solution and the activated sludge in the second-stage aerobic reaction tank 7 flow back to the anoxic reaction tank 5 for further denitrification and dephosphorization. The effluent of the second-stage aerobic reaction tank 7 enters a tube sedimentation tank 8 to separate sludge in water, the separated sludge enters a sludge tank 9, is subjected to filter pressing by a filter press 10 and then is transported outwards, and clear water enters a vertical electronic flocculator 12 to be further subjected to electric flocculation treatment, wherein NaClO, HClO, clO generated by electric flocculation is utilized ^- And the OH with strong oxidizing capability can further oxidize, remove and disinfect pollutants in water so as to ensure the water quality effect, and is convenient to recycle, and meanwhile, the normal water outlet effect is ensured when the water quality fluctuates greatly or the front-stage biochemical treatment is not ideal. The effluent of the vertical electronic flocculator 12 is filtered by a ferro-manganese filter 11, and suspended matters in the water are further removed for recycling or discharging. The experimental results are shown in Table 1.

TABLE 1 Effect of latex paint wastewater treatment

Processing procedure

COD(mg/L)

pH

Turbidity (NTU)

BOD(mg/L)

TSS(mg/L)

B/C

Emulsion paint wastewater

20000-30000

6.50-7.0

>1000

83

30000-40000

≤0.01

Open type electronic flocculation device

≤3000

6.50-7.0

≤50

≥500

≤80

≥0.3

IC+A/O ₂

≤90

7.0-7.5

≤50

≤20

≤50

/

Vertical electronic flocculator

≤70

7.0-7.5

≤30

≤15

≤50

/

Filtration

≤65

7.0-7.5

≤5

≤15

≤10

/

Emission standard (second level)

≤100

6.0-9.0

/

≤30

/

As can be seen from Table 1, the treatment system and the treatment method of the invention are adopted to treat the latex paint wastewater, the suspended matter removal rate of the open type electronic condenser on the latex paint wastewater is more than 99.5%, the COD removal rate is as high as 90%, and the biodegradability B/C value is improved to be more than 0.3, so that the pretreatment effect of the open type electronic condenser on the latex paint wastewater is obvious. IC anaerobic reactor +A/O ₂ The biochemical removal rate of COD is more than 97%, and the biochemical effect is very ideal. The vertical electronic flocculator further removes COD and BOD, and completely meets the emission standard. Therefore, the treatment system and the method have high treatment efficiency on latex paint wastewater and stable water outlet.

Example 2

In the embodiment, water distribution holes which are uniformly distributed are processed at the lower part of the side wall of the joint of the primary precipitation tank 3-1 and the electric flocculation reactor 3-2, and the aperture of the water distribution holes is 10mm; the electric flocculation reactor 3-2 is formed by connecting a rectifier 3-2-1, a double-circuit circulation time relay 3-2-2 and electrode groups 3-2-3, wherein the number of the electrode groups 3-2-3 is 1; 20L-shaped clamping grooves are respectively and equidistantly processed on the inner sides of the two front insulating frameworks 3-2-3-7 along the length direction, and 20 straight clamping grooves are respectively and equidistantly processed on the rear insulating frameworks 3-2-3-1 along the length direction; the distance between the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 is 10mm, and the thickness of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 is 2mm. The connection relationship between other components is the same as in example 1.

Example 3

In the embodiment, water distribution holes which are uniformly distributed are processed at the lower part of the side wall of the joint of the primary precipitation tank 3-1 and the electric flocculation reactor 3-2, and the aperture of the water distribution holes is 30mm; the electric flocculation reactor 3-2 is formed by connecting a rectifier 3-2-1, a double-circuit circulation time relay 3-2-2 and electrode groups 3-2-3, wherein the number of the electrode groups 3-2-3 is 5; 30L-shaped clamping grooves are respectively and equidistantly processed on the inner sides of the two front insulating frameworks 3-2-3-7 along the length direction, and 30 straight clamping grooves are respectively and equidistantly processed on the rear insulating frameworks 3-2-3-1 along the length direction; the distance between the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 is 30mm, and the thickness of the first rectangular electrode plate 3-2-3-2 and the second rectangular electrode plate 3-2-3-4 is 6mm. The connection relationship between other components is the same as in example 1.

Claims

1. A latex paint wastewater treatment system is characterized in that: an artificial grid well (1) is arranged at the water inlet of the grit chamber (2), the water outlet of the grit chamber (2) is communicated with the water inlet of the open type electronic flocculation device (3) through a pipeline, the water outlet of the open type electronic flocculation device (3) is communicated with a sedimentation separation tank (14), the sedimentation separation tank (14) is communicated with an IC anaerobic reactor (4) through a lifting pump (13) arranged on the pipeline, and the IC anaerobic reactor (4) is communicated with A/O (anaerobic reactor/anaerobic reactor) ₂ The biochemical reactor is communicated with the A/O ₂ The biochemical reactor is sequentially composed of an anoxic reaction tank (5), a first-stage aerobic reaction tank (6) and a second-stage aerobic reaction tank (7), wherein the water outlet of the second-stage aerobic reaction tank (7) is connected with an inclined tube sedimentation tank (8) through a pipelineOne outlet of the inclined tube sedimentation tank (8) is communicated with a sludge tank (9), the other outlet is communicated with a vertical electronic flocculator (12), the sludge tank (9) is connected with a filter press (10), and the vertical electronic flocculator (12) is communicated with a ferromanganese filter (11).

2. The latex paint wastewater treatment system of claim 1 wherein: the open type electronic flocculation device (3) comprises an electronic flocculation reactor (3-2) with one end arranged in the middle of the right side wall of the primary sedimentation tank (3-1) and the other end arranged in the middle of the left side wall of the buffer tank (3-3), water distribution holes are uniformly distributed in the lower portion of the side wall of the joint of the primary sedimentation tank (3-1) and the electronic flocculation reactor (3-2), the aperture of the water distribution holes is 10-30 mm, an opening is formed in the upper portion of the side wall of the joint of the electronic flocculation reactor (3-2) and the buffer tank (3-3), and the primary sedimentation tank (3-1) and the buffer tank (3-3) are made of any one of polyamide, polyethylene, polypropylene, polyurethane and polycarbonate.

3. The latex paint wastewater treatment system of claim 2 wherein: the electric flocculation reactor (3-2) is formed by connecting a rectifier (3-2-1) for converting alternating current into direct current, a double-circuit circulation time relay (3-2-2) and an electrode group (3-2-3), wherein the output end of the rectifier (3-2-1) is connected with the input end of the electrode group (3-2-3), the double-circuit circulation time relay (3-2-2) is connected with the rectifier (3-2-1), and the number of the electrode groups (3-2-3) is 1-5.

4. A latex paint wastewater treatment system as set forth in claim 3 wherein: the structure of the electrode group (3-2-3) is as follows: two ends of the two strip-shaped front insulating frameworks (3-2-3-7) are fixedly connected by insulating screws (3-2-3-5) to form an electrode plate base, an even number of L-shaped clamping grooves are processed on the inner sides of the two front insulating frameworks (3-2-3-7) at equal intervals along the length direction, the first rectangular electrode plates (3-2-3-2) and the second rectangular electrode plates (3-2-3-4) are inserted in the L-shaped clamping grooves on the electrode plate base in a staggered manner, the first rectangular electrode plates (3-2-3-2) and the second rectangular electrode plates (3-2-3-4) are connected with the rectifier (3-2-1) through wires, the polarities of the first rectangular electrode plates (3-2-3-2) and the second rectangular electrode plates (3-2-3-4) are opposite, all the first rectangular electrode plates (3-2-3-2) are connected by a first conductor (3-2-3-3), all the second rectangular electrode plates (3-2-3-4) are connected by a second conductor (3-2-3-6), the rear ends of the first rectangular electrode plates (3-2-3-2) and the second rectangular electrode plates (3-2-3-4) are symmetrically provided with two rear insulating frameworks (3-2-3-1), an even number of straight clamping grooves are processed on the rear insulating frameworks (3-2-3-1) at equal intervals along the length direction, the straight clamping grooves are matched with the first rectangular electrode plate (3-2-3-2) and the second rectangular electrode plate (3-2-3-4), and two ends of the two rear insulating frameworks (3-2-3-1) are fixedly connected through insulating screws (3-2-3-5).

5. The latex paint wastewater treatment system of claim 4 wherein: the distance between the first rectangular electrode plate (3-2-3-2) and the second rectangular electrode plate (3-2-3-4) is 10 mm-30 mm, and the thickness of the first rectangular electrode plate (3-2-3-2) and the second rectangular electrode plate (3-2-3-4) is 2-6 mm.

6. The latex paint wastewater treatment system of claim 4 or 5 wherein: the shell of the open type electronic flocculator (3), the front insulating framework (3-2-3-7), the rear insulating framework (3-2-3-1) and the insulating screw (3-2-3-5) are made of any one of polyamide, polyethylene, polypropylene, polyurethane and polycarbonate, and the first rectangular electrode plate (3-2-3-2) and the second rectangular electrode plate (3-2-3-4) are aluminum plates.

7. The latex paint wastewater treatment system of claim 1 wherein: the vertical electronic flocculator (12) is as follows: a water inlet pipe (12-11) is arranged on one side of the bottom end of an insulating shell (12-1), a drain pipe (12-10) is arranged on the other side of the bottom end of the insulating shell, a water outlet pipe (12-5) is arranged on the side wall of the upper end of the insulating shell (12-1), an upper cover plate (12-4) is arranged at the opening of the insulating shell (12-1), a first electrode binding post (12-2) and a second electrode binding post (12-3) are arranged on the upper cover plate (12-4), one ends of the first electrode binding post (12-2) and the second electrode binding post (12-3) extend into the insulating shell (12-1), the first electrode binding post (12-2) and the second electrode binding post (12-3) which are positioned in the insulating shell (12-1) are alternately arranged from top to bottom at equal intervals, a first arc electrode plate (12-6) and a second arc electrode plate (12-7) are connected with the first electrode binding post (12-7) through a metal bolt (12-8), one ends of the first electrode binding post (12-2) and the second electrode binding post (12-3) extend into the insulating shell (12-1), one ends of the first electrode binding post (12-2) and the second electrode binding post (12-3) are connected with the second electrode binding post (12-3) through an insulating unit (12-9), and the second arc electrode binding post (12-3) are connected with the second arc electrode binding post (12-3) through a metal nut (12-7) Is connected with the first electrode binding post (12-2) through an insulating unit (12-9), wherein the insulating unit (12-9) consists of a plastic base (12-9-1) and a plastic pad (12-9-2).

8. The latex paint wastewater treatment system of claim 7 wherein: the geometric shapes of the first arc-shaped electrode plate (12-6) and the second arc-shaped electrode plate (12-7) are figures formed by major arcs and chords of the major arcs, and the straight edge of the first arc-shaped electrode plate (6) and the straight edge of the second arc-shaped electrode plate (7) are positioned on two opposite sides.

9. The latex paint wastewater treatment system of claim 7 or 8 wherein: the first arc electrode plate (12-6) and the second arc electrode plate (12-7) are aluminum plates, and the first electrode binding post (12-2) and the second electrode binding post (12-3) are metal screws.

10. A method of treating latex paint wastewater using the system of claim 1, wherein: removing particulate impurities from emulsion paint wastewater through an artificial grid well (1), flowing into a sand setting tank (2), removing particulate fillers in the emulsion paint wastewater through the sand setting tank (2), flowing into a primary sedimentation tank (3-1) of an open type electronic flocculation device (3), entering into an electronic flocculation reactor (3-2) after primary sedimentation, demulsifying the emulsion wastewater through the action of an electric field, and entering into a sedimentation separation tank (14) after further layering sedimentation of the demulsified emulsion wastewater through a buffer tank (3-3); sewage in the sedimentation separation tank (14) enters the IC anaerobic reactor (4) through the lift pump (13), and after being treated by the IC anaerobic reactor (4), the sewage automatically flows into the anoxic reaction tank (5), the first-stage aerobic reaction tank (6) and the second-stage aerobic reaction tank (7) in sequence to carry out A/O ₂ Biochemical treatment, and discharge of a second-stage aerobic reaction tank (7)The water enters into a tube sedimentation tank (8), the water in the tube sedimentation tank (8) is subjected to sedimentation separation, the sludge enters into a sludge tank (9), the sludge is conveyed outwards after being subjected to filter pressing by a filter press (10), the clean water enters into a vertical electronic flocculator (12), and the water discharged from the vertical electronic flocculator (12) is recycled or discharged after being filtered by a ferro-manganese filter (11).