CN111233251A - Reactive dye printing and dyeing wastewater treatment system - Google Patents
Reactive dye printing and dyeing wastewater treatment system Download PDFInfo
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- CN111233251A CN111233251A CN201911007965.2A CN201911007965A CN111233251A CN 111233251 A CN111233251 A CN 111233251A CN 201911007965 A CN201911007965 A CN 201911007965A CN 111233251 A CN111233251 A CN 111233251A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to the technical field of sewage treatment, and discloses a reactive dye printing and dyeing wastewater treatment system which comprises a wastewater adjusting tank, an anaerobic reactor, a high-pressure air desulfurization device, an aerobic biochemical tank, a secondary sedimentation tank and a physicochemical treatment tank which are sequentially connected through pipelines, wherein the top of the high-pressure air desulfurization device is provided with a high-pressure spray device, the bottom of the high-pressure air desulfurization device is provided with a micro-air-float releaser connected with an air compressor positioned outside the high-pressure air desulfurization device, a booster pump is arranged between the anaerobic reactor and the high-pressure air desulfurization device, one end of the booster pump is connected with the anaerobic reactor, and the other. The high-pressure air desulfurization device can rapidly remove sulfur ions generated in anaerobic reaction, has no biotoxicity, can excessively feed high-pressure air, has thorough desulfurization, low operation cost, no generation of extra sludge and high reaction speed; and the high-pressure air desulfurization device can change the anaerobic environment of the wastewater into the aerobic environment in advance, so that the subsequent aerobic biochemical treatment is favorably utilized.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a reactive dye printing and dyeing wastewater treatment system.
Background
The reactive dye is a dye which contains one or more than one reactive group in ions or molecules, and can generate bonding reaction with hydroxyl on cellulose fibers, amino on protein fibers and polyamide fibers under proper conditions to generate covalent bonding between the dye and the fibers. The reactive dye has the advantages of simple molecular structure, bright color, complete color spectrum, convenient use, low cost and the like, and gradually replaces insoluble azo dyes, direct dyes, sulfur dyes and vat dyes to become the main dyes for dyeing cellulose fibers.
However, the reactive dye has the problems of low fixation rate and high salt dyeing requirement, namely, anhydrous sodium sulphate (Na) needs to be added in the dyeing process2SO4) The neutral electrolyte is used for improving the adsorption rate of the dye, balancing the adsorption quantity and the adsorption density on the fiber. Therefore, the reactive dye printing and dyeing wastewater contains redundant reactive dye molecules and salt, and is industrial wastewater with high chroma, moderate COD concentration (2500 mg/L) and high salt (8000 mg/L).
Due to the self characteristics of simple structure, good water solubility and the like of the reactive dye molecules, the traditional physicochemical coagulation and decoloration treatment cannot effectively remove the dye molecules, so that the chromaticity of the wastewater cannot reach the standard easily. According to the technical specification of textile dyeing and finishing industrial wastewater treatment engineering HJ471-2009, the reactive dye wastewater treatment generally adopts the following steps: the anaerobic hydrolysis acidification process with good operation can effectively degrade active dye molecules and reduce the chromaticity of effluent. However, when the method is used for treating the active dye wastewater, the sulfate radical is inevitably reduced into sulfide due to more sulfate in the wastewater, and the sulfide has biotoxicity and toxic action on the active sludge, so that the activity of the active sludge is greatly reduced, and the treatment effect of an aerobic biochemical system is influenced.
There is also a method of performing chemical oxidative desulfurization by adding an oxidizing agent such as hydrogen peroxide or sodium hypochlorite, for example, "a method of treating wastewater dyed with a reactive dye" disclosed in chinese patent literature, which is under publication No. CN1274609C, and comprises: firstly, discharging reactive dye dyeing wastewater discharged by a printing and dyeing system at the temperature of 60-90 ℃ into a heat-preservation reaction tank; then adjusting the pH value of the dyeing wastewater to 6-8; adding a catalyst and an oxidant into the dyeing wastewater after the pH value is adjusted, and reacting for 5-60 minutes. Although the method can greatly reduce the chroma and COD of the dyeing wastewater of the reactive dye, the dosage of the used chemical oxidant is not easy to control, and when the oxidant is excessive, the water treatment microorganisms are easy to kill, thereby causing influence on the subsequent biological treatment effect.
Disclosure of Invention
The invention provides an active dye printing and dyeing wastewater treatment system, which aims to solve the problems that in the prior art, more sulfate exists in active dye wastewater, sulfate radicals can be reduced into sulfides in the treatment process, the sulfides have biological toxicity and have a toxic effect on active sludge, the activity of the active sludge can be greatly reduced, and the treatment effect of a subsequent aerobic biochemical system is influenced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an active dye printing and dyeing wastewater treatment system, includes waste water equalizing basin, anaerobic reactor, high-pressure air desulphurization unit, good oxygen biochemical pond, two heavy ponds and the materialization processing pond that loop through the tube coupling, high-pressure air desulphurization unit top is equipped with high-pressure spray set, and the bottom is equipped with the little air supporting releaser of being connected with the air compressor machine that is located outside the high-pressure air desulphurization unit, be equipped with the booster pump between anaerobic reactor and the high-pressure air desulphurization unit, booster pump one end is connected with anaerobic reactor, and one end is connected with high-pressure spray set.
The invention firstly removes impurities such as fine fluff, thread ends, short fibers and the like in the sewage through the wastewater adjusting tank; then passing through an anaerobic reactorThe anaerobic bacteria degrade active dye molecules, break macromolecular groups, primarily remove chromaticity, and have the advantages of high efficiency, no generation of chemical sludge, low operation cost and the like compared with coagulation and decoloration; then, the sulfur ions in the anaerobic atmosphere are rapidly removed by air through a high-pressure air desulfurization device, and the reaction principle is as follows: 2Na2S+O2+2H2O = =4NaOH +2S ↓; then, the organic matters in the wastewater are further removed through an aerobic biochemical tank; and then carrying out mud-water separation in a secondary sedimentation tank, and finally removing the soluble biological colloid in the water through a physicochemical treatment tank to ensure that the chroma and COD index of the effluent meet the requirements.
According to the invention, by utilizing the characteristic that air can be rapidly and largely dissolved in water under high pressure, high-pressure air compressed by an air compressor is blown in through a micro-air-float releaser at the bottom of a high-pressure air desulfurization device, and the high-pressure air is pressurized by a booster pump and is in contact reaction with wastewater sprayed and falling from a high-pressure spraying device at the top of the device in the rising process, so that sulfur ions generated in anaerobic reaction can be rapidly removed, compared with a method for forming sulfide precipitate by adding oxidant or metal salt in the traditional process, the method has no biotoxicity, the high-pressure air can be excessively added, the desulfurization is thorough, water treatment microorganisms cannot be killed due to excessive chemical reagent addition, the operation cost is low, no extra sludge is generated, the reaction speed is high, the equipment retention time is short, and no pollution is caused; and the high-pressure air desulfurization device can change the anaerobic environment of the wastewater into the aerobic environment in advance, so that the subsequent aerobic biochemical treatment is favorably utilized.
Preferably, the exhaust pressure of the air compressor is 0.3 MPa-0.5 MPa, and the effluent pressure of the booster pump is 0.35 MPa-0.5 MPa. In the pressure range, the air can be dissolved in water in a large amount and quickly, so that the reaction speed can be accelerated, the equipment retention time can be shortened, and the treatment efficiency can be improved.
Preferably, the micro-air-float releaser is provided with air release holes, and the diameter of each air release hole is 15-30 μm. Compared with the conventional perforation aeration device, the micro air-float releaser with the diameter of the air release hole of 15-30 mu m can form smaller air bubbles, improve the contact area of air and liquid, facilitate the rapid dissolution of air and increase the reaction rate.
Preferably, the water inlet end of the wastewater adjusting tank is provided with a grid well, a mechanical grid is arranged in the grid well, the wastewater adjusting tank is internally provided with a pH measuring device and a liquid level control device, and the bottom of the wastewater adjusting tank is provided with a perforated aeration device connected with an air blower positioned outside the wastewater adjusting tank. The water inlet is provided with a grid well which can remove impurities such as fine fluff, thread ends, short fibers and the like in the sewage; a liquid level control device is arranged in the regulating tank and used for controlling the water level of the regulating tank and keeping the water inlet stable; meanwhile, the pH parameter of the controlled inlet water is known through a pH measuring device, so that the subsequent treatment parameter can be set conveniently; the perforated aeration device at the bottom of the tank plays roles in aeration stirring, cooling and the like.
Preferably, a perforated water distribution sludge discharge pipe positioned at the bottom of the reactor, a three-phase separator positioned at the top of the reactor and an annular water collecting device positioned between the perforated water distribution sludge discharge pipe and the three-phase separator are arranged in the anaerobic reactor, a water diversion tank and an adjusting tank lifting pump are arranged between the wastewater adjusting tank and the anaerobic reactor, the water inlet end of the water diversion tank is connected with the wastewater adjusting tank, the water outlet end of the water diversion tank is connected with the adjusting tank lifting pump, the adjusting tank lifting pump is connected with the perforated water distribution sludge discharge pipe, an anaerobic circulating pump is arranged outside the anaerobic reaction, one end of the anaerobic circulating pump is connected with the annular water collecting device, and the other end of the anaerobic circulating pump is connected with the perforated water distribution sludge discharge pipe.
The effluent of the wastewater adjusting tank enters a perforated water distribution sludge discharge pipe in the anaerobic reactor through a water diversion tank and an adjusting tank lift pump, is pumped from the bottom of the anaerobic reactor through the perforated water distribution sludge discharge pipe and is fully mixed with anaerobic granular sludge in the reactor, most organic substances are converted into methane after reaction, a three-phase separator can well separate the methane, water and sludge, the methane is collected from the top and enters a subsequent methane treatment system, wastewater flows into the subsequent treatment system, and anaerobic sludge flows back to a sludge bed. Meanwhile, the annular water collecting device and the anaerobic circulating pump are arranged in the anaerobic reactor, and part of anaerobic effluent entering the annular water collecting device can realize circulation through the anaerobic circulating pump, so that the anaerobic effluent is fully utilized to dilute the influent, and the concentration and pH of influent pollutants are further reduced. The perforated water distribution sludge discharge pipe arranged at the bottom of the reactor can distribute water uniformly, so that a sludge bed at the bottom of the anaerobic reactor is always in a suspension expansion state, the sludge-water mixing effect is greatly improved, and the treatment effect is improved.
Preferably, the system also comprises a biogas treatment device connected with the anaerobic reactor, and the biogas treatment device is internally provided with desulfurization fillers. The marsh gas generated in the anaerobic reactor can enter a marsh gas treatment device after being separated by the three-phase separator, and can be collected and utilized after being desulfurized, thereby realizing the effective utilization of energy.
Preferably, the bottom of the aerobic biochemical tank is provided with a lifting fixed aeration device connected with a blower positioned outside the tank, the liftable fixed aeration device sequentially comprises an air inlet main pipe, a limiting vertical pipe, a main vertical pipe and a microporous aeration pipe from top to bottom, wherein the air inlet main pipe is connected with an air blower and is parallel to the bottom of the tank, the limiting vertical pipe is vertically connected with the lower part of the air inlet main pipe, the main vertical pipe is detachably connected with the limiting vertical pipe through a flange sheet, the microporous aeration pipe is vertically connected with the lower end of the main vertical pipe through a distributor, and a fixed bracket which is positioned below the microporous aeration pipe and fixed at the bottom of the tank, wherein the fixed bracket comprises a vertical bracket which is vertically fixed at the bottom of the tank and a horizontal bracket which is vertically arranged between the vertical brackets, the distributor is connected with the fixed support through a threaded connecting piece, one end of the threaded connecting piece is provided with a hook, the other end of the threaded connecting piece is hooked on the horizontal support, and the other end of the threaded connecting piece is in threaded connection with the bottom of the distributor.
During operation, air enters the limiting vertical pipe through the air inlet main pipe, flows through the limiting vertical pipe and the main vertical pipe, enters the microporous aeration pipe through the distributor, is blown into the aerobic biochemical tank through the microporous aeration pipe to supply oxygen for aerobic microorganisms in the tank, enables aerobic sludge in the tank to keep an even suspension state, and effectively removes organic matters in wastewater.
The air inlet main pipe and the limiting vertical pipe form an upper limiting device of the main vertical pipe, the fixing support is used as a lower limiting device of the main vertical pipe, the main vertical pipe is in a state of being limited at two ends, the main vertical pipe is stable, and the main vertical pipe is not prone to swinging, so that backpressure at an air outlet of the microporous aeration pipe is stable, aeration in the tank is uniform, and the service life of an aeration pipe membrane is long. Meanwhile, the fixing support adopts a frame structure consisting of the vertical support and the horizontal support, the horizontal support can have a certain degree of small deformation in the vertical direction, the abrasion of the connecting piece due to the micro-vibration can be avoided, the abrasion of the upper end flange piece due to the vibration is also avoided, and the frequent replacement of the sealing ring at the position is avoided. And spacing riser and main riser between, all be for dismantling the connection between main riser and the fixed bolster, when the device needs maintenance/change, demolish the stop device on upper portion and can be with the latter half from the pond and put forward, easy dismounting does not stop the production and overhauls/change.
Preferably, the micropore aeration pipe is in threaded connection with the distributor, evenly distributed micropores are formed in the micropore aeration pipe, and the diameter of each micropore is 0.5-2.0 mm. The diameter of the bubbles generated by the microporous aeration pipe with the aperture is small, and the oxygen mass transfer efficiency is high.
Preferably, the top of the secondary sedimentation tank is provided with a water outlet weir, the bottom of the secondary sedimentation tank is provided with a mud bucket area, the secondary sedimentation tank is externally provided with a sludge reflux pump, one end of the sludge reflux pump is connected with the mud bucket area, and the other end of the sludge reflux pump is connected with the aerobic biochemical tank. The wastewater enters a secondary sedimentation tank to realize mud-water separation through sedimentation, sludge enters a mud bucket area at the bottom and flows back to an aerobic biochemical tank under the action of a sludge reflux pump to continue reaction, and the settled clear water enters a subsequent physicochemical treatment tank from a water outlet weir to continue treatment.
Preferably, the physicochemical treatment pool comprises a reaction zone and an air flotation zone which are communicated with each other, a flocculating agent feeding device and a stirring device are arranged in the reaction zone, a dissolved air water releasing device is arranged on one side of the air flotation zone close to the reaction zone, a sludge scraping device and a sludge collecting groove are arranged at the top of the air flotation zone, and the top of the sludge collecting groove is positioned below the sludge scraping device. The effluent of the secondary sedimentation tank firstly enters a reaction zone of the physicochemical treatment tank, a flocculating agent is added through a flocculating agent adding device, the effluent is fully stirred and reacts through a stirring device to flocculate and precipitate soluble biological colloids in the wastewater, then the effluent enters an air floatation zone, particles after the flocculation and precipitation are adhered through bubbles released by an air-dissolved water releasing device to form a water-gas-particle three-phase mixed system, after the particles are adhered with the bubbles, flocs with apparent density smaller than that of water are formed and float to the water surface, a scum layer is formed and is scraped by a mud scraping device, the flocs enter a mud collecting tank and are finally discharged, and the wastewater is further treated to reach the discharge standard.
Therefore, the invention has the following beneficial effects:
(1) anaerobic bacteria in the anaerobic reactor are utilized to degrade active dye molecules, macromolecular groups are broken, and chromaticity is removed, so that the method has the advantages of high efficiency, no generation of chemical sludge, low operating cost and the like compared with coagulation and decoloration;
(2) by utilizing the characteristic that air can be rapidly and largely dissolved in water under high pressure, sulfur ions generated in anaerobic reaction can be rapidly removed through the high-pressure air desulfurization device, compared with the traditional process of forming sulfide precipitate by adding oxidant or metal salt, the method has no biotoxicity, high-pressure air can be excessively added, desulfurization is thorough, water treatment microorganisms cannot be killed due to excessive addition of chemical reagents, the operation cost is low, no extra sludge is generated, the reaction speed is high, the equipment retention time is short, and pollution to air cannot be caused; the high-pressure air desulfurization device can change the anaerobic environment of the wastewater into the aerobic environment in advance, so that the subsequent aerobic biochemical treatment is facilitated;
(3) the aeration device in the aerobic biochemical tank adopts a lifting fixed type aeration device, the main vertical pipe is stable and does not swing, so that the back pressure at the air outlet of the microporous aeration pipe is stable, the aeration in the tank is uniform, and the service life of the membrane of the aeration pipe is long; the abrasion of the upper end flange sheet caused by vibration is eliminated, and the frequent replacement of the sealing ring at the part is avoided; meanwhile, the limiting vertical pipe is detachably connected with the main vertical pipe, and the main vertical pipe is detachably connected with the fixed support, when the device needs to be maintained/replaced, the limiting device on the upper part is detached, and the lower half part can be lifted out of the pool, so that the device is convenient to disassemble and assemble, and can be maintained/replaced without stopping production; the fixed bolster adopts the frame construction that vertical support and horizontal stand constitute, and the horizontal stand can have the micro-deformation of certain degree in vertical direction, can avoid the wearing and tearing of micro-vibration to bolt fastener.
Drawings
FIG. 1 is a schematic view of a connection structure of the present invention;
FIG. 2 is a schematic view of the construction of a high pressure air desulfurization unit;
FIG. 3 is a schematic structural view of a liftable fixed aeration device in an aerobic biochemical tank;
FIG. 4 is a schematic diagram of the structure of a materialization processing tank.
In the figure: 1 wastewater adjusting tank, 101 grid wells, 102 mechanical grids, 103 pH measuring devices, 104 liquid level control devices, 105 perforated aeration devices, 2 anaerobic reactors, 201 perforated water distribution and sludge discharge pipes, 202 three-phase separators, 203 annular water collecting devices, 3 high-pressure air desulfurization devices, 301 high-pressure spray devices, 302 micro-air flotation releasers, 4 aerobic biochemical tanks, 401 liftable fixed aeration devices, 4011 air inlet main pipes, 4012 limiting vertical pipes, 4013 main vertical pipes, 4014 micro-pore aeration pipes, 4015 vertical supports, 4016 horizontal supports, 4017 flange plates, 4018 distributors, 4019 threaded connectors, 5 secondary sedimentation tanks, 501 water outlet weirs, 502 mud bucket areas, 6 physicochemical treatment tanks, 601 reaction areas, 602 air flotation areas, 603 flocculating agent adding devices, 604 stirring devices, 605 dissolved air water releasing devices, 605, 606 mud scraping device, 607 mud collecting tank, 7 air compressor, 8 booster pump, 9 blower, 10 water diversion tank, 11 adjusting pool lift pump, 12 anaerobic circulating pump, 13 marsh gas processing device, 1301 desulfurization filler, 14 mud reflux pump.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
The attached drawings in the invention are only the structure and connection schematic diagrams of each reaction tank, and do not represent actual placement and pipeline laying. The pH measuring device, the liquid level control device, the perforating aeration device, the three-phase separator, the stirring device, the pump, the mud scraping device, the micro-air-flotation releaser and the like in the invention are all conventional devices in the prior art, and are not the key points of the invention.
Example (b):
in the embodiment shown in fig. 1, the reactive dye printing and dyeing wastewater treatment system comprises a wastewater adjusting tank 1, an anaerobic reactor 2, a high-pressure air desulphurization device 3, an aerobic biochemical tank 4, a secondary sedimentation tank 5 and a physicochemical treatment tank 6 which are connected in sequence through pipelines.
A grating well 101 is arranged at the water inlet end of the wastewater adjusting tank 1, a mechanical grating 102 is arranged in the grating well, a pH measuring device 103 and a liquid level control device 104 are arranged in the wastewater adjusting tank, and a perforation aeration device 105 connected with an air blower 6 positioned outside the wastewater adjusting tank is arranged at the bottom of the wastewater adjusting tank.
The anaerobic reactor 2 is internally provided with a perforated water distribution sludge discharge pipe 201 positioned at the bottom of the reactor, a three-phase separator 202 positioned at the top of the reactor and an annular water collecting device 203 positioned between the perforated water distribution sludge discharge pipe and the three-phase separator, a water diversion tank 10 and an adjusting tank lifting pump 11 are arranged between a wastewater adjusting tank and the anaerobic reactor, the water inlet end of the water diversion tank is connected with the wastewater adjusting tank, the water outlet end is connected with the adjusting tank lifting pump, the adjusting tank lifting pump is connected with the perforated water distribution sludge discharge pipe, an anaerobic circulating pump 12 is also arranged outside the anaerobic reaction, one end of the anaerobic circulating pump is connected with the annular water collecting device, and the other end of the anaerobic circulating pump is connected with the perforated water distribution sludge discharge. The system also comprises a biogas treatment device 13 connected with the three-phase separator in the anaerobic reactor, and a desulfurization filler 1301 is arranged in the biogas treatment device.
As shown in fig. 2, the high-pressure air desulfurization device 3 is provided with a high-pressure spray device 301 at the top and a micro-air-float releaser 302 at the bottom, which is connected with an air compressor 7 located outside the high-pressure air desulfurization device, and the micro-air-float releaser is provided with air release holes with a diameter of 20 μm. A booster pump 8 is arranged between the anaerobic reactor and the high-pressure air desulphurization device, one end of the booster pump is connected with the anaerobic reactor, the other end of the booster pump is connected with the high-pressure spray device, the exhaust pressure of the air compressor is 0.4MPa, and the effluent pressure of the booster pump is 0.4 MPa.
The bottom of the aerobic biochemical tank 4 is provided with a liftable fixed aeration device 401 connected with a blower positioned outside the tank, as shown in figure 3, the liftable fixed type aeration device sequentially comprises an air inlet main pipe 4011 which is connected with an air blower and is parallel to the bottom of the tank, a limit vertical pipe 4012 which is vertically connected with the lower part of the air inlet main pipe, a main vertical pipe 4013 which is detachably connected with the limit vertical pipe through a flange piece 4017, and a micropore aeration pipe 4014 which is vertically connected with the lower end of the main vertical pipe through a distributor 4018 from top to bottom, and be located the fixed bolster of fixing at the bottom of the pool below the micropore aeration pipe, the fixed bolster includes vertical fixed vertical support 4015 at the bottom of the pool and sets up the horizontal stand 4016 between vertical support perpendicularly, distributor and fixed bolster are connected through threaded connection 4019 that one end was equipped with the crotch, and threaded connection is hung on the horizontal stand to the one end hook that threaded connection was equipped with the crotch, the other end and distributor bottom threaded connection. The micropore aeration pipe is in threaded connection with the distributor, evenly distributed micropores are arranged on the micropore aeration pipe, and the diameter of each micropore is 1.0 mm.
The top of the secondary sedimentation tank 5 is provided with an effluent weir 501, the bottom of the secondary sedimentation tank is provided with a mud bucket area 502, the secondary sedimentation tank is externally provided with a sludge reflux pump 14, one end of the sludge reflux pump is connected with the mud bucket area, and the other end of the sludge reflux pump is connected with the aerobic biochemical tank.
As shown in FIG. 4, the physicochemical treatment tank 6 comprises a reaction zone 601 and an air flotation zone 602 which are communicated with each other, a flocculating agent adding device 603 and a stirring device 604 are arranged in the reaction zone, a dissolved air water releasing device 605 is arranged on one side of the air flotation zone close to the reaction zone, a sludge scraping device 606 and a sludge collecting groove 607 are arranged at the top of the air flotation zone, and the top of the sludge collecting groove is positioned below the sludge scraping device.
When the system is in operation, the reactive dye printing and dyeing wastewater firstly enters a wastewater adjusting tank, and impurities such as fine fluff, thread ends, short fibers and the like in the wastewater are removed through a mechanical grid in a grid well; the liquid level control device can control the water level of the regulating tank and keep the water inlet stable; meanwhile, the pH parameter of the controlled inlet water is known through a pH measuring device, so that the subsequent treatment parameter can be set conveniently; the perforated aeration device at the bottom of the tank plays roles in aeration stirring, cooling and the like.
The effluent of the wastewater adjusting tank enters a perforated water distribution sludge discharge pipe in the anaerobic reactor through a water diversion tank and an adjusting tank lift pump, is pumped from the bottom of the anaerobic reactor through the perforated water distribution sludge discharge pipe and is fully mixed with anaerobic granular sludge in the reactor, most organic substances are converted into methane after reaction, a three-phase separator can well separate the methane, water and sludge, the methane is collected from the top and enters a subsequent methane treatment system, wastewater flows into the subsequent treatment system, and anaerobic sludge flows back to a sludge bed. Meanwhile, the anaerobic circulating pump enables part of anaerobic outlet water entering the annular water collecting device to realize circulation, and anaerobic outlet water is favorably fully utilized to dilute inlet water, so that the concentration and pH value of inlet water pollutants are further reduced. The perforation water distribution mud pipe that anaerobic reactor bottom set up can the uniform water distribution, makes the sludge blanket of anaerobic reactor bottom be in the suspension inflation state all the time, and muddy water mixing effect promotes greatly, improves treatment effect.
The effluent of the anaerobic reactor is pressurized to 0.4MPa by a booster pump and then sprayed from a high-pressure spraying device at the top of the high-pressure air desulfurization device to fall, meanwhile, the high-pressure air with the pressure of 0.4MPa compressed by an air compressor is blown from a micro-air-float releaser at the bottom of the high-pressure air desulfurization device, and the high-pressure air is contacted with the wastewater which is pressurized by the booster pump and sprayed from the high-pressure spraying device at the top of the device to carry out reaction in the ascending process, so that the sulfur ions generated in the anaerobic reaction can be rapidly removed.
The effluent of the high-pressure air desulfurization device enters an aerobic biochemical tank, air is continuously blown in through an aeration device at the bottom of the aerobic biochemical tank, and organic matters in the wastewater are further removed under the action of aerobic microorganisms.
And the effluent of the aerobic biochemical tank enters a secondary sedimentation tank for mud-water separation, the precipitated sludge enters a sludge bucket area at the bottom and flows back to the aerobic biochemical tank for continuous reaction under the action of a sludge reflux pump, and the precipitated clear water enters a physicochemical treatment tank from an effluent weir.
The effluent of the secondary sedimentation tank firstly enters a reaction zone of the physicochemical treatment tank, a flocculating agent is added through a flocculating agent adding device, the effluent is fully stirred and reacts through a stirring device, soluble biological colloid in the wastewater is flocculated and precipitated, then the effluent enters an air floatation zone, particles after the flocculation and precipitation are adhered through bubbles released by an air-dissolved water releasing device to form a water-gas-particle three-phase mixed system, after the particles are adhered with the bubbles, floc with apparent density smaller than that of water is formed and floats to the water surface, a scum layer is formed and is scraped by a mud scraping device, the floc enters a mud collecting tank and is finally discharged, and the final effluent of the physicochemical treatment tank meets the discharge requirement.
The treatment system is used for treating the reactive dye printing and dyeing wastewater, the COD of the inlet water is 1500mg/L, the SS (suspended substance) is 400mg/L, and the chroma is 400 times; the COD of the effluent is 150mg/L, the SS is 10mg/L, the chroma is 40 times, and the discharge standard that the COD is 250mg/L, the SS is 40mg/L and the chroma is 80 times is met.
Claims (10)
1. The utility model provides an active dye printing and dyeing wastewater treatment system, characterized by, includes waste water equalizing basin (1), anaerobic reactor (2), high-pressure air desulphurization unit (3), good oxygen biochemical pond (4), two heavy ponds (5) and materialization processing pond (6) that loop through the tube coupling, high-pressure air desulphurization unit top is equipped with high-pressure spray set (301), and the bottom is equipped with little air supporting releaser (302) of being connected with air compressor machine (7) that are located outside the high-pressure air desulphurization unit, be equipped with booster pump (8) between anaerobic reactor and the high-pressure air desulphurization unit, booster pump one end is connected with anaerobic reactor, and one end is connected with high-pressure spray set.
2. The reactive dye printing and dyeing wastewater treatment system as set forth in claim 1, wherein the exhaust pressure of the air compressor is 0.3MPa to 0.5MPa, and the effluent pressure of the booster pump is 0.35MPa to 0.5 MPa.
3. The reactive dye printing and dyeing wastewater treatment system as set forth in claim 1 or 2, wherein the micro-air-flotation releaser is provided with air release holes, and the diameter of the air release holes is 15-30 μm.
4. The reactive dye printing and dyeing wastewater treatment system as claimed in claim 1, wherein a grid well (101) is arranged at the water inlet end of the wastewater regulating pond, a mechanical grid (102) is arranged in the grid well, a pH measuring device (103) and a liquid level control device (104) are arranged in the wastewater regulating pond, and a perforated aeration device (105) connected with an air blower (9) positioned outside the wastewater regulating pond is arranged at the bottom of the wastewater regulating pond.
5. The reactive dye printing and dyeing wastewater treatment system according to claim 1, wherein a perforated water distribution sludge discharge pipe (201) at the bottom of the reactor, a three-phase separator (202) at the top of the reactor, and an annular water collection device (203) between the perforated water distribution sludge discharge pipe and the three-phase separator are arranged in the anaerobic reactor, a water diversion tank (10) and an adjusting tank lift pump (11) are arranged between the wastewater adjusting tank and the anaerobic reactor, the water inlet end of the water diversion tank is connected with the wastewater adjusting tank, the water outlet end of the water diversion tank is connected with the adjusting tank lift pump, the adjusting tank lift pump is connected with the perforated water distribution sludge discharge pipe, an anaerobic circulating pump (12) is arranged outside the anaerobic reaction, one end of the anaerobic circulating pump is connected with the annular water distribution device, and the other end of the anaerobic circulating pump is connected with the perforated water distribution sludge discharge pipe.
6. The reactive dye printing and dyeing wastewater treatment system as claimed in claim 1 or 5, characterized by further comprising a biogas treatment device (13) connected with the anaerobic reactor, wherein a desulfurization filler (1301) is arranged in the biogas treatment device.
7. The reactive dye printing and dyeing wastewater treatment system as claimed in claim 1, wherein a liftable fixed aeration device (401) connected with an air blower outside the aerobic biochemical tank is arranged at the bottom of the aerobic biochemical tank, the liftable fixed aeration device sequentially comprises an air inlet main pipe (4011) which is connected with the air blower and is parallel to the tank bottom, a limit vertical pipe (4012) vertically connected with the lower part of the air inlet main pipe, a main vertical pipe (4013) detachably connected with the limit vertical pipe through a flange plate (4017), a micropore aeration pipe (4014) vertically connected with the lower end of the main vertical pipe through a distributor (4018), and a fixed support which is positioned below the micropore aeration pipe and fixed at the tank bottom, the fixed support comprises a vertical support (4015) vertically fixed at the tank bottom and a horizontal support (4016) vertically arranged between the vertical supports, the distributor and the fixed support are connected through a threaded connection piece (4019) with a hook at one end, one end of the threaded connecting piece provided with a hook is hooked on the horizontal support, and the other end of the threaded connecting piece is in threaded connection with the bottom of the distributor.
8. The reactive dye printing and dyeing wastewater treatment system as set forth in claim 7, wherein the micropore aeration pipe is in threaded connection with the distributor, uniformly distributed micropores are formed on the micropore aeration pipe, and the diameter of each micropore is 0.5-2.0 mm.
9. The reactive dye printing and dyeing wastewater treatment system as claimed in claim 1, wherein the top of the secondary sedimentation tank is provided with a water outlet weir (501), the bottom of the secondary sedimentation tank is provided with a mud bucket area (502), the secondary sedimentation tank is externally provided with a sludge return pump (14) with one end connected with the mud bucket area, and the other end of the sludge return pump is connected with the aerobic biochemical tank.
10. The reactive dye printing and dyeing wastewater treatment system as claimed in claim 1, wherein the physicochemical treatment tank comprises a reaction zone (601) and an air flotation zone (602) which are communicated with each other, a flocculating agent adding device (603) and a stirring device (604) are arranged in the reaction zone, a dissolved air water releasing device (605) is arranged on one side of the air flotation zone close to the reaction zone, a sludge scraping device (606) and a sludge collecting tank (607) are arranged at the top of the air flotation zone, and the top of the sludge collecting tank is positioned below the sludge scraping device.
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| CN201911007965.2A CN111233251A (en) | 2019-10-22 | 2019-10-22 | Reactive dye printing and dyeing wastewater treatment system |
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| CN201911007965.2A CN111233251A (en) | 2019-10-22 | 2019-10-22 | Reactive dye printing and dyeing wastewater treatment system |
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Cited By (1)
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| CN111960623A (en) * | 2020-09-22 | 2020-11-20 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment system and method capable of achieving lifting aeration |
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