CN210683495U - Printing and dyeing wastewater treatment system - Google Patents
Printing and dyeing wastewater treatment system Download PDFInfo
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- CN210683495U CN210683495U CN201921099875.6U CN201921099875U CN210683495U CN 210683495 U CN210683495 U CN 210683495U CN 201921099875 U CN201921099875 U CN 201921099875U CN 210683495 U CN210683495 U CN 210683495U
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Abstract
The utility model discloses a printing and dyeing wastewater treatment system, which comprises an adjusting tank, a facultative hydrolysis tank, a hydrolysis sedimentation tank, a pre-aeration tank, an aerobic tank and an MBR membrane tank which are connected in sequence; all be provided with aeration equipment in facultative hydrolysis pond, the aeration tank in advance, the good oxygen pond, first fan pass through first admission line with aeration equipment in the facultative hydrolysis pond is connected, first fan pass through the second admission line with aeration equipment in the aeration tank in advance is connected, and the second fan passes through good oxygen pond admission line and is connected with aeration equipment in the good oxygen pond, be provided with the valve on the first air-supply line. The utility model discloses an add aeration tank in advance, avoid the sulphide to get into the problem that causes the bloated of high sulphide type mud behind the follow-up good oxygen pond.
Description
Technical Field
The utility model belongs to the technical field of water treatment, in particular to printing and dyeing wastewater treatment system.
Background
The main pollution characteristics of the printing and dyeing wastewater are poor biodegradability, high organic matter content and deep chroma, and the method is a key point of attention in industrial wastewater treatment research. The sulfur in the sulfur printing and dyeing wastewater mainly exists in two forms of sulfate and sulfide, and in the conventional process for the high-concentration wastewater, hydrolysis acidification is usually adopted as a pretreatment process, and sulfate radicals in the water are reduced into a large amount of sulfide after the hydrolysis acidification treatment. After entering the aerobic tank, hydrogen sulfide has a larger toxic inhibition effect on zoogloea bacteria than on filamentous bacteria, so that the filamentous bacteria have an advantage in growth competition with the zoogloea bacteria; on the other hand, the existence of the reduced sulfide provides energy for the propagation of the filamentous fungi, and meanwhile, a large amount of organic acid provides rich carbon sources for the filamentous fungi, so that the propagation of the filamentous fungi has great advantages. Therefore, the sludge bulking of the high sulfide type frequently occurs in the subsequent aerobic treatment of the conventional process.
In the prior art, aiming at printing and dyeing wastewater with high sulfur concentration, iron salt is usually added to remove sulfides in a precipitation mode. Although the method can effectively precipitate soluble sulfide and free hydrogen sulfide and reduce the toxicity of the sulfide, the long-time application of the method often causes a large amount of sulfide to be deposited in the reactor, causes pipeline blockage, reduces the volume of the reactor, reduces the activity of sludge and increases the treatment difficulty of chemical sludge.
SUMMERY OF THE UTILITY MODEL
The utility model provides a printing and dyeing wastewater treatment system, through addding aeration tank in advance, avoid the sulphide to get into the problem that causes the bloated of high sulphide type mud behind the follow-up good oxygen pond.
The technical scheme of the utility model as follows:
a printing and dyeing wastewater treatment system comprises an adjusting tank, a facultative hydrolysis tank, a hydrolysis sedimentation tank, a pre-aeration tank, an aerobic tank and an MBR membrane tank which are connected in sequence; the facultative hydrolysis tank, the pre-aeration tank and the aerobic tank are internally provided with aeration devices, a first fan is connected with the aeration devices in the facultative hydrolysis tank through a first air inlet pipeline, the first fan is connected with the aeration devices in the pre-aeration tank through a second air inlet pipeline, and the second fan is connected with the aeration devices in the aerobic tank through an aerobic tank air inlet pipeline.
Printing and dyeing wastewater carries extremely through the inlet channel the equalizing basin, the play water of equalizing basin promotes through the elevator pump to the facultative tank of hydrolysising, the play water of facultative tank of hydrolysising gets into the sedimentation tank of hydrolysising, the supernatant play water of sedimentation tank of hydrolysising gets into aeration tank in advance, the aeration tank goes out water and gets into the reaction in the good oxygen pond in advance, the play water of good oxygen pond gets into MBR membrane cisterna, and the clear liquid up to standard discharges or the retrieval and utilization.
Preferably, the front end of the facultative hydrolysis pool is provided with a hydraulic screen.
Preferably, the filtering precision of the hydraulic screen is 1 mm.
Preferably, a filler is arranged in the facultative hydrolysis tank.
Preferably, a membrane module is arranged in the MBR membrane tank reactor, the membrane module is a hollow fiber membrane module or a flat plate membrane module, effluent of the aerobic tank automatically flows into the MBR membrane tank, mud-water separation is carried out through the membrane module, and standard clear liquid is discharged or recycled.
Preferably, the sludge in the MBR membrane tank flows back to the aerobic tank through a pipeline, and the residual sludge is conveyed to the sludge tank through a pipeline.
Preferably, part of sludge in the hydrolysis sedimentation tank returns to the facultative hydrolysis tank through a pipeline, and the rest sludge is conveyed to the sludge tank through a pipeline.
Preferably, the aeration device of the facultative hydrolysis tank comprises a plurality of aerators, the aeration device of the pre-aeration tank comprises a plurality of aerators, the aeration device of the aerobic tank comprises a plurality of aerators, and the aeration rate of a single aerator of the hydrolysis tank is 15-20m3H, the aeration rate of a single aerator of the pre-aeration tank is 25-30m3H, the aeration rate of a single aerator of the aerobic tank is 25-30m3/h。
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model adds a pre-aeration tank between the facultative hydrolysis tank and the aerobic tank, on one hand, sulfide in the wastewater is fully removed through pre-aeration, and the expansion of high sulfide sludge caused by the sulfide entering the subsequent aerobic tank is avoided; on the other hand, the preaeration tank and the facultative hydrolysis tank can share one fan, mutual switching can be realized through the air inlet pipeline, when the facultative hydrolysis tank stops aeration and stirring, the fan can continue to operate and is used by the preaeration tank, and the problem that the fan is frequently started and stopped due to intermittent aeration of the hydrolysis tank is avoided;
the utility model adopts the pre-aeration method to remove sulfur, and does not need extra adding drugs and chemical sludge.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a process flow diagram of a printing and dyeing wastewater treatment system according to embodiment 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. In practical applications, the improvement and adjustment made by those skilled in the art according to the present invention still belong to the protection scope of the present invention.
For better illustration of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings.
Example 1
A printing and dyeing wastewater treatment system is shown in figure 1 and comprises a regulating tank, a facultative hydrolysis tank, a hydrolysis sedimentation tank, a pre-aeration tank, an aerobic tank and an MBR membrane tank which are connected in sequence; aeration devices are arranged in the facultative hydrolysis tank, the pre-aeration tank and the aerobic tank; the first fan is connected with the aeration device in the facultative hydrolysis tank through a first air inlet pipeline, the first fan is connected with the aeration device in the pre-aeration tank through a second air inlet pipeline, and the second fan is connected with the aeration device in the aerobic tank through an aerobic tank air inlet pipeline;
printing and dyeing wastewater carries extremely through the inlet channel the equalizing basin, the play water of equalizing basin promotes through the elevator pump to the facultative tank of hydrolysising, the play water of facultative tank of hydrolysising gets into the sedimentation tank of hydrolysising, the supernatant play water of sedimentation tank of hydrolysising gets into aeration tank in advance, the aeration tank goes out water and gets into the reaction in the good oxygen pond in advance, the play water of good oxygen pond gets into MBR membrane cisterna, and the clear liquid up to standard discharges or the retrieval and utilization.
The applicant finds that high sulfide type sludge expansion is easy to occur in a subsequent aerobic tank due to the existence of high-concentration sulfides, and the sulfides in the wastewater are sufficiently removed by pre-aeration through the additionally arranged pre-aeration tank, so that the high sulfide type sludge expansion caused by the sulfides entering the subsequent aerobic tank is avoided; the sulfur is removed by adopting a pre-aeration method, no extra medicine is needed to be added, and no chemical sludge is generated.
In addition, in the prior art, different fans are often designed for the facultative hydrolysis pool and the aerobic pool due to different water levels so as to be required by air stirring of the facultative hydrolysis pool and aeration and oxygenation of the aerobic pool, the air stirring of the facultative hydrolysis pool is basically carried out intermittently, and the fans have the problem of frequent start and stop. This application is through increasing aeration tank in advance, aeration tank and facultative hydrolysis pond can design into the same water level in advance, aeration tank aeration oxygenates used fan in advance and can hydrolysises the pond sharing with the facultative, foretell first fan promptly, the accessible sets up the air inlet that the pond was hydrolysised to the facultative control facultative with the facultative on the first air-supply line in the pond of hydrolysising to first fan, when the facultative hydrolysis pond stops the air inlet stirring, first fan can continue the operation, supply aeration tank to use in advance, avoided the fan frequently to open and stop the problem.
The adjusting tank is used for homogenizing the quality and the quantity of the wastewater so as to facilitate the normal work of subsequent biological treatment equipment and ensure the stable operation of sewage treatment. The effluent of the regulating tank is lifted to a facultative hydrolysis tank by a lift pump.
The front end of the facultative hydrolysis tank can be provided with a hydraulic screen, and the filtering precision of the hydraulic screen can be 1mm, so that large granular substances or fiber flocs and the like in sewage can be removed, and the adverse effect on a membrane system is avoided. In the pond of hydrolysising, the anaerobic hydrolysis process takes place the pollutant conversion, and the difficult degradable macromolecule organic matter is turned into the soluble micromolecule organic matter of easy microbial degradation in the waste water, improves waste water biodegradability, and the sulfate radical in the waste water is reduced into the sulphide again simultaneously. Be provided with the aerator in the facultative hydrolysis tank for through intermittent type aeration stirring for muddy water intensive mixing has saved conventional agitated vessel, reduces the siltation of bottom of the pool mud, improves the acidizing effect of hydrolysising. Simultaneously, the filler is arranged in the tank, anaerobic sludge and facultative sludge can be effectively intercepted, and the specific filler can be commonly used in the market according to the requirement.
And (4) the effluent of the facultative hydrolysis tank enters a hydrolysis sedimentation tank, and the sludge is precipitated in the sedimentation tank. A sludge return pipeline is arranged at the bottom of the sedimentation tank, and part of sludge returns to the front end of the facultative hydrolysis tank so as to keep the activity of the sludge in the facultative hydrolysis tank and prevent anaerobic and facultative sludge from entering a subsequent aerobic tank to cause biological foam accumulation; and conveying the residual sludge to a sludge tank through a pipeline.
And (3) enabling supernatant effluent of the hydrolysis sedimentation tank to enter a pre-aeration tank for pre-aeration to fully oxidize sulfides in the wastewater. Preventing the expansion of high sulfide sludge in the subsequent aerobic tank and reducing the load of the subsequent aerobic process. An aerator is arranged in the pre-aeration tank to fully aerate and stir the wastewater.
The effluent of the pre-aeration tank enters an aerobic tank for full reaction, and an aerator is arranged in the aerobic tank to realize oxygenation, so that the requirement of removing pollutants can be met, the dissolved oxygen level at the rear end can be reduced, and the aeration balance in the tank is ensured; the dissolved oxygen level at the front end of the aerobic tank can be improved through the pre-aeration of the pre-aeration tank.
And a membrane module is arranged in the MBR membrane tank, the membrane module is a hollow fiber membrane module or a flat plate membrane module, effluent of the aerobic tank automatically flows into the MBR membrane tank, mud and water are separated through the membrane module, and then the standard-reaching clear liquid can be discharged or recycled. Part of sludge in the membrane separator flows back to the front end of the aerobic tank.
The aeration device of the facultative hydrolysis tank comprises a plurality of aerators, the aeration device of the pre-aeration tank comprises a plurality of aerators, the aeration device of the aerobic tank comprises a plurality of aerators, and the selected ventilation capacity of a single aerator can reach 50m3An aerator of/h; in operation, the aeration rate is set as follows, and the aeration rate of a single aerator of the hydrolysis tank is 15-20m3H, the aeration rate of a single aerator of the pre-aeration tank is 25-30m3H, the aeration rate of a single aerator of the aerobic tank is 25-30m3/h。
The aerator in the embodiment can be a common aerator in the market, and can also refer to an aerator of ZL201610601121.0 'a limited space efficient oxygenation system'.
Application example
The printing and dyeing wastewater treatment system is adopted to treat printing and dyeing wastewater of a certain enterprise in Zhejiang, and the treatment water volume is 8000m3And d, the original wastewater treatment process is a regulation-hydrolysis-aerobic-MBR process, and because the water level difference between the actual hydrolysis tank and the aerobic tank is large, if a fan is adopted, the fan cannot supply air to the hydrolysis tank, and the sludge is found to often expand to influence the treatment effect. The applicant finds that the high sulfide type sludge bulking is easy to occur in the subsequent aerobic pool due to the existence of the high-concentration sulfide by detecting the concentration of the sulfide (250-380mg/L) in the effluent of the hydrolysis pool. In order to solve the problems of air supply and sludge expansion and improve the treatment process, the applicant designs an independent fan (15kW, 1 set) to supply air to a hydrolysis tank, and adds a preaeration tank behind a hydrolysis sedimentation tank, so that sulfides in the hydrolysis effluent are converted into sulfates through high-strength aeration, and the sludge expansion of a subsequent aerobic tank is avoided. After the pre-aeration of the pre-aeration tank, the sulfide concentration in the wastewater is reduced to below 2 mg/L.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A printing and dyeing wastewater treatment system is characterized by comprising an adjusting tank, a facultative hydrolysis tank, a hydrolysis sedimentation tank, a pre-aeration tank, an aerobic tank and an MBR membrane tank which are connected in sequence; aeration devices are arranged in the facultative hydrolysis tank, the pre-aeration tank and the aerobic tank; the first fan is connected with the aeration device in the facultative hydrolysis tank through a first air inlet pipeline, the first fan is connected with the aeration device in the pre-aeration tank through a second air inlet pipeline, and the second fan is connected with the aeration device in the aerobic tank through an aerobic tank air inlet pipeline.
2. The printing and dyeing wastewater treatment system according to claim 1, characterized in that the front end of the facultative hydrolysis tank is provided with a hydraulic screen.
3. The printing and dyeing wastewater treatment system according to claim 2, wherein the hydraulic screen has a filtration accuracy of 1 mm.
4. The printing and dyeing wastewater treatment system according to claim 1, characterized in that a filler is arranged in the facultative hydrolysis tank.
5. The printing and dyeing wastewater treatment system according to claim 1, characterized in that a membrane module is arranged in the MBR membrane tank reactor, the membrane module is a hollow fiber membrane module or a flat plate membrane module, the effluent of the aerobic tank automatically flows into the MBR membrane tank, and the sludge and water are separated by the membrane module, so that the qualified clear liquid is discharged or recycled.
6. The printing and dyeing wastewater treatment system according to claim 1, wherein the sludge in the MBR membrane tank flows back to the aerobic tank through a pipeline, and the residual sludge is conveyed to the sludge tank through a pipeline.
7. The printing and dyeing wastewater treatment system according to claim 1, wherein part of sludge in the hydrolysis sedimentation tank returns to the facultative hydrolysis tank through a pipeline, and the rest sludge is conveyed to the sludge tank through a pipeline.
8. The printing and dyeing wastewater treatment system according to claim 1, wherein the aeration device of the facultative hydrolysis tank comprises a plurality of aerators, the aeration device of the pre-aeration tank comprises a plurality of aerators, the aeration device of the aerobic tank comprises a plurality of aerators, and the aeration rate of a single aerator of the hydrolysis tank is 15-20m3H, the aeration rate of a single aerator of the pre-aeration tank is 25-30m3H, the aeration rate of a single aerator of the aerobic tank is 25-30m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921099875.6U CN210683495U (en) | 2019-07-12 | 2019-07-12 | Printing and dyeing wastewater treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921099875.6U CN210683495U (en) | 2019-07-12 | 2019-07-12 | Printing and dyeing wastewater treatment system |
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| Publication Number | Publication Date |
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| CN210683495U true CN210683495U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921099875.6U Active CN210683495U (en) | 2019-07-12 | 2019-07-12 | Printing and dyeing wastewater treatment system |
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