CN211283963U - Alkali decrement printing and dyeing wastewater pretreatment system - Google Patents
Alkali decrement printing and dyeing wastewater pretreatment system Download PDFInfo
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- CN211283963U CN211283963U CN201921826669.0U CN201921826669U CN211283963U CN 211283963 U CN211283963 U CN 211283963U CN 201921826669 U CN201921826669 U CN 201921826669U CN 211283963 U CN211283963 U CN 211283963U
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Abstract
The utility model relates to a sewage treatment plant technical field discloses an alkali decrement printing and dyeing wastewater pretreatment system, including the waste water equalizing basin, coagulating air supporting pond, neutralization reaction tank and the coagulating sedimentation tank that loop through the pipe connection, be equipped with the line mixer on the pipeline between waste water equalizing basin and the coagulating air supporting pond, the line mixer is connected with PAFC charge device, is equipped with alkali lye charge device and pH measuring device in the neutralization reaction tank. The utility model can adjust pH value to effectively separate out the characteristic pollutant TA in the alkali reduction wastewater and can flocculate and collect suspended matters by adding the flocculating agent PAFC to react with the wastewater in the coagulation air flotation tank, thereby greatly reducing COD in the wastewater; in addition, extra acid is not needed to be added, the investment cost of the medicament is reduced, and the corrosion of the acid to equipment is avoided; after TA is removed, the wastewater is adjusted to be neutral through the neutralization reaction tank, so that the dosage of alkali liquor required for neutralization is reduced, and the hardness of effluent is not influenced.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment plant technique and specifically relates to a alkali decrement printing and dyeing wastewater pretreatment system is related to.
Background
The alkali weight reduction wastewater makes the water quality characteristics of one type of printing and dyeing wastewater completely different from the water quality characteristics of the traditional printing and dyeing wastewater due to the existence of a characteristic pollutant Terephthalic Acid (TA), although the water quantity of the alkali weight reduction wastewater accounts for about 5-10% of the printing and dyeing wastewater, the discharged TA accounts for more than 50% of the COD of the whole mixed wastewater, and the alkali weight reduction wastewater has attracted more and more attention in recent years due to poor biodegradability and great treatment difficulty.
The conventional treatment method of alkali-reduction wastewater generally adopts an acid precipitation method or an alkali precipitation method, for example, an "alkali-reduction wastewater acid precipitation system" disclosed in chinese patent literature, publication No. CN205500880U, which includes an alkali-reduction wastewater raw water tank, an acid adding device, a confluence device, a mixing tank, and an automatic pH monitoring and controlling device.
However, when the acidification method is used for treating the alkali-reduction wastewater, a large amount of sulfuric acid is required to be consumed for adjusting the pH value, the acid-adjusting cost is high, the treatment capacity of the traditional acidification method for TA is low, the treatment requirement cannot be met, and the alkalinity of the comprehensive wastewater treatment system is easily insufficient when the wastewater is discharged into the comprehensive wastewater; when the alkaline precipitation method is adopted, a large amount of lime needs to be added, the hardness of effluent is high, the conductivity and hardness of comprehensive wastewater are increased, and the membrane treatment and recycling are greatly influenced.
Disclosure of Invention
The utility model aims to overcome the defects that when the acidification method is used for treating the alkali reduction wastewater in the prior art, a large amount of sulfuric acid is required to be consumed for adjusting the pH value, the acidification cost is high, the treatment capacity of the traditional acidification method to TA is low, the treatment requirement cannot be met, and the alkalinity of a comprehensive wastewater treatment system is easy to be insufficient when the wastewater is discharged into the comprehensive wastewater; when the alkali precipitation method is adopted, a large amount of lime needs to be added, the hardness of effluent is high, the conductivity and hardness of comprehensive wastewater are increased, and the problem of great influence on membrane treatment and recycling is solved; in addition, extra acid is not needed to be added, the investment cost of the medicament is reduced, and the corrosion of the acid to equipment is avoided; meanwhile, the dosage of alkali liquor required by neutralization is reduced, the cost of the medicament is reduced, and the hardness of effluent is not influenced.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an alkali decrement printing and dyeing wastewater pretreatment of water system, is including passing through pipe connection's waste water equalizing basin, coagulating air supporting pond, neutralization reaction pond and coagulating sedimentation tank, is equipped with the pipeline mixer on the pipeline between waste water equalizing basin and the coagulating air supporting pond, and the pipeline mixer is connected with PAFC charge device, is equipped with alkali lye charge device and pH measuring device in the neutralization reaction pond.
The utility model utilizes the characteristic that the characteristic pollutant Terephthalic Acid (TA) in the alkali decrement wastewater is dissolved under the alkaline condition and is separated out under the acidic condition, and firstly removes large-particle suspended matters in the wastewater through the wastewater adjusting tank, and stabilizes the water quality and the water quantity of the wastewater; then adding a PAFC flocculating agent through a pipeline mixer, so that the stabilized wastewater and the PAFC enter a coagulation air flotation tank together, because the PAFC has high acidity, hydroxide ions in the alkali decrement wastewater can be separated out, ferric hydroxide precipitate is formed, the alkalinity of the wastewater is reduced, the pH of the wastewater is adjusted to 4-5, the optimal condition for TA separation is achieved, the TA is separated out from the wastewater, and the flocculating agent PAFC can capture suspended matters to be effectively removed through air flotation; the effluent of the coagulation air flotation tank enters a neutralization reaction tank, alkali liquor is added through an alkali liquor dosing device and is matched with a pH measuring device, the pH of the wastewater is adjusted to be neutral, and the subsequent treatment is facilitated; finally, the reaction product is finally precipitated through a coagulating sedimentation tank, and the effluent enters a subsequent treatment unit for advanced treatment.
The utility model can not only adjust pH value to effectively separate out TA in the wastewater, but also flocculate and collect suspended matters to greatly reduce COD of the wastewater by the reaction of the flocculating agent PAFC and the wastewater in the coagulation air flotation tank; the purpose of adjusting the pH can be achieved without adding extra acid, the investment cost of the medicament is reduced, and the corrosion of the acid to equipment is avoided; after TA is removed, alkali liquor is added into the neutralization reaction tank to neutralize the residual iron, and the wastewater is adjusted to be neutral so as to achieve the anaerobic and aerobic biochemical conditions of the subsequent treatment process. Compared with the traditional treatment method, the dosage of alkali liquor required by neutralization is reduced, the medicament input cost is reduced, and the hardness of effluent is not influenced.
As preferred, the end of intaking of waste water equalizing basin is equipped with the grid well, is equipped with mechanical grid in the grid well, is equipped with pH measuring device and level measurement device in the waste water equalizing basin. The mechanical grating can remove impurities such as large-particle suspended matters, fine fluff, thread ends, short fibers and the like in the wastewater; the pH measuring device is used for monitoring the pH of raw water in real time, and is convenient for adjusting the adding amount of a subsequent PAFC dosing device; the liquid level measuring device is used for controlling the water quantity in the regulating reservoir in real time, is convenient for regulating the wastewater lift pump and enables the water inflow in the coagulation air flotation reservoir to be stable.
Preferably, a wastewater lifting pump is arranged between the wastewater adjusting tank and the pipeline mixer, so that wastewater can be smoothly mixed with the PAFC to enter the coagulation air flotation tank.
Preferably, an electromagnetic flow meter is arranged behind the wastewater lifting pump, so that the wastewater metering and the subsequent dosing control of the PAFC dosing device are facilitated.
Preferably, the bottom of the coagulation air flotation tank is provided with a dissolved air release device, the surface of the tank is provided with an air flotation slag fishing device, and a sludge collecting tank is arranged in the tank. The wastewater and the particles after PAFC flocculation and precipitation are adhered by bubbles released by a dissolved air release device in the coagulation air flotation tank to form a water-gas-particle three-phase mixed system, after the bubbles are adhered by the particles, flocs with apparent density smaller than that of water are formed and float to the water surface, a scum layer is formed and is fished by an air flotation slag fishing device to enter a sludge collecting tank, and finally, the scum layer is discharged out of the tank, and the discharged water enters a neutralization reaction tank for continuous treatment.
Preferably, a stirring device is arranged in the neutralization reaction tank. The wastewater can be fully mixed with the added alkali liquor under the stirring action, so that the pH value of the wastewater is uniformly adjusted.
Preferably, the top of the coagulating sedimentation tank is provided with a water outlet weir and a mud scraper, the bottom of the coagulating sedimentation tank is provided with a sludge hopper, and a mud suction machine connected with a mud discharge pipe extending out of the tank is arranged above the sludge hopper. The wastewater can precipitate flocculation products which are not removed in the air floatation tank and reactants generated in the neutralization reaction tank to the bottom of the tank in the coagulating sedimentation tank, enters a sludge hopper under the action of a sludge scraper, is finally sucked out by a sludge suction machine and is discharged out of the tank through a sludge discharge pipe, and the precipitated effluent enters a subsequent treatment unit through an effluent weir for advanced treatment.
Therefore, the utility model discloses following beneficial effect has:
(1) by adding a flocculating agent PAFC to react with the wastewater in the coagulation air flotation tank, not only can the pH be adjusted to effectively separate out the characteristic pollutant TA in the alkali reduction wastewater, but also the suspended matters can be flocculated and captured, so that the COD in the wastewater is greatly reduced;
(2) the purpose of adjusting the pH can be achieved without adding extra acid, the investment cost of the medicament is reduced, and the corrosion of the acid to equipment is avoided;
(3) after TA is removed, alkali liquor is added into the neutralization reaction tank to neutralize residual iron, the wastewater is adjusted to be neutral, and anaerobic and aerobic biochemical conditions of a subsequent treatment process are achieved, compared with the traditional treatment method, the consumption of the alkali liquor required by neutralization is reduced, the agent input cost is reduced, and the hardness of effluent is not influenced;
(4) the coagulation air flotation tank is combined with the coagulation sedimentation tank, so that flocculation products can be effectively removed, and the treatment effect of wastewater is improved.
Drawings
Fig. 1 is a schematic view of a connection structure of the present invention.
In the figure: 1 waste water equalizing basin, 2 thoughtlessly congeal air supporting pond, 201 dissolved air release, 202 air supporting drag for sediment device, 203 mud collecting vat, 3 neutralization reaction pond, 4 coagulating sedimentation tank, 401 play weir, 402 mud scraper, 403 sludge bucket, 404 suction dredge, 405 mud pipe, 5 pipeline mixer, 6 PAFC charge device, 7 pH measuring device, 8 alkali lye charge device, 9 agitating unit, 10 liquid level measuring device, 11 waste water elevator pump, 12 electromagnetic flowmeter.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
The drawings in the utility model are only the structure and the connection schematic diagram of each reaction tank, and do not represent actual placement and pipeline laying. The utility model provides a pH measuring device, liquid level measuring device, charge device, pump, air supporting drag for sediment device, mud scraper, suction dredge, dissolve gas release etc. and be the conventional device among the prior art, not the utility model discloses a key.
Example (b):
as shown in fig. 1, the alkali-reduction printing and dyeing wastewater pretreatment system comprises a wastewater adjusting tank 1, a coagulation air flotation tank 2, a neutralization reaction tank 3 and a coagulation sedimentation tank 4 which are sequentially connected through pipelines.
The end of intaking of waste water equalizing basin is equipped with grid well 101, is equipped with mechanical grid 102 in the grid well, is equipped with pH measuring device 7 and level measurement device 10 in the waste water equalizing basin. Be equipped with pipeline mixer 5 on the pipeline between waste water equalizing basin and the coagulating air supporting pond, pipeline mixer is connected with PAFC charge device 6, is equipped with waste water elevator pump 11 between waste water equalizing basin and the pipeline mixer, is equipped with electromagnetic flowmeter 12 behind the waste water elevator pump.
The bottom of the coagulation air flotation tank is provided with a dissolved air release device 201, the surface of the tank is provided with an air flotation slag removing device 202, and the tank is internally provided with a sludge collecting tank 203. An alkali liquor dosing device 8, a pH measuring device 7 and a stirring device 9 are arranged in the neutralization reaction tank, and the stirring device comprises a stirring paddle positioned in the neutralization reaction tank and a driving motor connected with the stirring paddle. The top of the coagulating sedimentation tank is provided with a water outlet weir 401 and a mud scraper 402, the bottom of the coagulating sedimentation tank is provided with a sludge hopper 403, and a mud suction machine 404 connected with a mud discharge pipe 405 extending out of the tank is arranged above the sludge hopper.
When the pretreatment system in the utility model operates, the wastewater firstly passes through the wastewater adjusting tank, and impurities such as large granular suspended matters, fine fluff, thread ends, short fibers and the like in the wastewater are removed through the mechanical grid in the wastewater adjusting tank; and the pH value of raw water and the liquid level in the tank are monitored in real time through a pH measuring device and a liquid level measuring device in the tank, so that the adding amount of a subsequent PAFC dosing device and the flow of a wastewater lifting pump are convenient to adjust, and the quality and the quantity of inflow water in the coagulation air flotation tank are stable.
The effluent of the wastewater adjusting tank and the PAFC flocculating agent added through the pipeline mixer are mixed together to enter a coagulation air flotation tank, because the PAFC acidity is large, hydroxide ions in alkali decrement wastewater can be separated out, ferric hydroxide precipitation is formed, the alkalinity of the wastewater is reduced, the pH of the wastewater is adjusted to 4-5, and the optimal condition for TA separation is achieved, so that TA is separated out from the wastewater, the flocculating agent PAFC can collect suspended matters to form solid particles, the solid particles are adhered by bubbles released by the dissolved air releasing device to form a water-air-particle three-phase mixed system, after the bubbles are adhered, flocs with apparent density smaller than that of water are formed and float to the water surface, a scum layer is formed, the flocs are fished by an air flotation slag fishing device to enter a sludge collecting tank, and the sludge is finally discharged out of the tank.
The effluent of the coagulation air flotation tank enters a neutralization reaction tank, and under the stirring action of a stirring device, alkali liquor added by an alkali liquor dosing device is matched with a pH measuring device to adjust the pH of the wastewater to be neutral so as to achieve the biochemical conditions of subsequent anaerobic and aerobic treatment.
The effluent of the neutralization reaction tank enters a coagulation sedimentation tank, flocculation products which are not removed in the air floatation tank and reactants generated in the neutralization reaction tank can be precipitated to the bottom of the tank in the coagulation sedimentation tank, the effluent enters a sludge hopper under the action of a sludge scraper, the effluent is finally sucked out by a sludge suction machine and is discharged out of the tank through a sludge discharge pipe, and the effluent after precipitation enters a subsequent treatment unit through an effluent weir for advanced treatment.
The utility model can adjust pH value to effectively separate out the characteristic pollutant TA in the alkali reduction wastewater and can flocculate and collect suspended matters by adding the flocculating agent PAFC to react with the wastewater in the coagulation air flotation tank, thereby greatly reducing COD in the wastewater; the purpose of adjusting the pH can be achieved without adding extra acid, the investment cost of the medicament is reduced, and the corrosion of the acid to equipment is avoided; after TA is removed, alkali liquor is added into the neutralization reaction tank to neutralize residual iron, the wastewater is adjusted to be neutral, and anaerobic and aerobic biochemical conditions of a subsequent treatment process are achieved, compared with the traditional treatment method, the consumption of the alkali liquor required by neutralization is reduced, the agent input cost is reduced, and the hardness of effluent is not influenced; the coagulation air flotation tank and the coagulation sedimentation tank are combined, so that flocculation products can be effectively removed, and the treatment effect of wastewater is improved.
Claims (7)
1. The alkali decrement printing and dyeing wastewater pretreatment system is characterized by comprising a wastewater adjusting tank (1), a coagulation air flotation tank (2), a neutralization reaction tank (3) and a coagulation sedimentation tank (4) which are sequentially connected through pipelines, wherein a pipeline mixer (5) is arranged on a pipeline between the wastewater adjusting tank and the coagulation air flotation tank and is connected with a PAFC (polyamide fiber reinforced plastics) dosing device (6), and an alkali liquor dosing device (8) and a pH measuring device (7) are arranged in the neutralization reaction tank.
2. The alkali-reduction printing and dyeing wastewater pretreatment system of claim 1, wherein a grid well (101) is arranged at the water inlet end of the wastewater adjusting tank, a mechanical grid (102) is arranged in the grid well, and a pH measuring device and a liquid level measuring device (10) are arranged in the wastewater adjusting tank.
3. The alkali-reduction printing and dyeing wastewater pretreatment system according to claim 1, wherein a wastewater lift pump (11) is provided between the wastewater conditioning tank and the pipeline mixer.
4. An alkali deweighting printing and dyeing wastewater pretreatment system as claimed in claim 3, wherein an electromagnetic flow meter (12) is provided after the wastewater lift pump.
5. The alkali-reduction printing and dyeing wastewater pretreatment system as claimed in claim 1, wherein a dissolved air release device (201) is arranged at the bottom of the coagulation air flotation tank, an air flotation slag salvaging device (202) is arranged on the surface of the coagulation air flotation tank, and a sludge collection tank (203) is arranged in the coagulation air flotation tank.
6. The alkali-reduction printing and dyeing wastewater pretreatment system according to claim 1, wherein a stirring device (9) is arranged in the neutralization reaction tank.
7. The alkali weight reduction printing and dyeing wastewater pretreatment system as claimed in claim 1, wherein a water outlet weir (401) and a mud scraper (402) are arranged at the top of the coagulation sedimentation tank, a sludge hopper (403) is arranged at the bottom of the coagulation sedimentation tank, and a mud suction machine (404) connected with a mud discharge pipe (405) extending out of the coagulation sedimentation tank is arranged above the sludge hopper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921826669.0U CN211283963U (en) | 2019-10-28 | 2019-10-28 | Alkali decrement printing and dyeing wastewater pretreatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921826669.0U CN211283963U (en) | 2019-10-28 | 2019-10-28 | Alkali decrement printing and dyeing wastewater pretreatment system |
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| CN211283963U true CN211283963U (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939329A (en) * | 2021-01-11 | 2021-06-11 | 浙江荣鑫纤维股份有限公司 | Water treatment on-line monitoring early warning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939329A (en) * | 2021-01-11 | 2021-06-11 | 浙江荣鑫纤维股份有限公司 | Water treatment on-line monitoring early warning system |
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