CN109133258B - Printing and dyeing wastewater treatment process - Google Patents
Printing and dyeing wastewater treatment process Download PDFInfo
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- CN109133258B CN109133258B CN201811023249.9A CN201811023249A CN109133258B CN 109133258 B CN109133258 B CN 109133258B CN 201811023249 A CN201811023249 A CN 201811023249A CN 109133258 B CN109133258 B CN 109133258B
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a printing and dyeing wastewater treatment process, which comprises the following steps: introducing the printing and dyeing wastewater into a pH value regulating tank, and regulating the pH value of the wastewater to 6-7; the effluent of the regulating reservoir is connected into a photocatalytic oxidation device to decompose organic matters in the wastewater; the effluent of the photocatalytic oxidation device is connected into a hydrolytic acidification tank, and the hydraulic retention time is 2-3 h; the water discharged from the hydrolysis acidification tank is connected into an activated sludge tank for treatment, and decolorization bacteria and PVA degrading bacteria are connected into the tank for reaction for 3-5 h; and (3) introducing the sewage subjected to the activity treatment into a filtering tank, filtering the solid precipitate through the filtering tank, and discharging the effluent. The invention improves the efficiency of catalytic oxidative decomposition, and the treated water quality is easier to reach the standard, and has the characteristics of low cost and high efficiency.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a printing and dyeing wastewater treatment process.
Background
The production process in the printing and dyeing industry mainly refers to the processes of desizing, scouring, bleaching, mercerizing, dyeing, printing, finishing and the like of cotton, chemical fiber and blended fabric. The amount of textile industry in China is large and wide, the amount of generated waste water is large, the concentration is high, and the method is one of industrial pollution sources which form serious threats to water environment pollution. In the textile industry wastewater, the pollution of printing and dyeing wastewater is the most serious.
The printing and dyeing production wastewater comprises desizing wastewater, scouring wastewater, bleaching wastewater, dyeing wastewater, soaping wastewater, printing wastewater, finishing wastewater and the like. The printing and dyeing processing objects mainly comprise cotton fabrics, cotton or chemical fiber mixed fabrics, purified fiber fabrics and the like, a large amount of wastewater is generated in the dyeing process and the finishing process, the difference of the wastewater quality is mainly related to impurities in the fibers, used dyes and auxiliaries, the dyes and the auxiliaries are mostly organic matters, and the printing and dyeing wastewater is generally organic wastewater which is difficult to degrade. The existing treatment process often has the defects that the treatment effect and the treatment cost cannot be contradicted due to single treatment technology, and the treated printing and dyeing wastewater cannot reach the discharge standard.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a printing and dyeing wastewater treatment process. The invention adopts a mode of combining biological treatment and chemical treatment to comprehensively treat the printing and dyeing wastewater, the adopted photocatalytic oxidation device drives the impeller I to rotate by the impact force when sewage is pumped, the rotation of the impeller I enables the cam to extrude the elastic air bag, and compressed air generated by the elastic air bag is blown in from the lower part of the catalyst particle interlayer, so that on one hand, the oxygen content in the sewage is increased, on the other hand, the inside of the catalyst particle interlayer is dredged, the contact between the catalyst and the sewage is increased, and when gas is discharged out of the reactor, the impeller II is driven to rotate by the power, so that the impeller II drives the movable plate to move to stir the sewage, the catalytic oxidation decomposition efficiency is improved, the treated water quality is easier to reach the standard, and the device has the characteristics of low cost and high efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a printing and dyeing wastewater treatment process, which comprises the following steps:
s1: introducing the printing and dyeing wastewater into a pH value regulating tank, and regulating the pH value of the wastewater to 6-7;
s2: the effluent of the regulating reservoir in the S1 is connected into a photocatalytic oxidation device to decompose organic matters in the wastewater;
s3: the effluent of the photocatalytic oxidation device in the S2 is connected into a hydrolytic acidification tank, and the hydraulic retention time is 2-3 h;
s4: the effluent of the hydrolysis acidification tank in the S3 is connected into an activated sludge tank for treatment, and decolorization bacteria and PVA degrading bacteria are connected into the tank for reaction for 3-5 h;
s5: the sewage subjected to the activity treatment in the S4 is connected into a filtering tank, solid precipitates are filtered through the filtering tank, and effluent is discharged;
the photocatalytic oxidation device in the S2 comprises a reactor, a photocatalytic light source, a catalyst particle interlayer, a stirring unit and a power unit, wherein the catalyst particle interlayer is arranged below the top of the reactor at intervals and is at least two layers, so that an internal cavity of the reactor is divided into a plurality of reaction chambers to realize a top-down multi-stage treatment structure; the bottom of the reactor is provided with a sedimentation tank, an inclined half baffle is arranged between the bottom of the reactor and the top of the sedimentation tank, vertical clapboards which are staggered up and down are arranged between the bottom of the sedimentation tank and the bottom of the half baffle, the sedimentation tank is divided into a sedimentation area and a clear water area, the bottom surface of the sedimentation area is inclined towards the wall of the sedimentation tank, and the lowest point of the wall of the sedimentation tank is provided with a sewage outlet; the top of the reactor is provided with a water inlet, the water inlet is connected with a water pumping pipe and a water pump, a clear water area of the sedimentation tank is connected with a water outlet, optical fiber sensors are arranged at the water inlet and the water outlet, and the optical fiber sensors are electrically connected with a control unit; the power unit is arranged in the reactor, is positioned below the water inlet and is used for blowing oxygen into the reactor and providing power for the stirring unit; wherein the content of the first and second substances,
the power unit comprises a first impeller, a rotating shaft, a fixing frame, a cam, an elastic air bag and a spray head, wherein the first impeller is arranged on the fixing frame through the rotating shaft and is positioned below the water inlet; the cam is arranged on the rotating shaft, the inner wall of the reactor is provided with an elastic air bag, the cam is in contact with the elastic air bag to compress the air bag, so that the elastic air bag generates compressed air, the surface of the elastic air bag is provided with an air inlet and an air outlet, the positions of the air inlet and the air outlet are respectively provided with a one-way valve, the air inlet extends to the outside of the reactor, and the air inlet is in contact with the outside air; the spray head is arranged below the catalyst particle interlayer and is communicated with the air outlet of the air bag through a hose. When the sewage treatment device works, sewage to be treated is pumped into the reactor from the water inlet through the water pumping pipe by the water pumping pump, the first impeller is pushed to rotate by impact force when the sewage flows out of the water inlet, the first impeller drives the cam to rotate through the rotating shaft, the elastic air bags are periodically compressed by the rotation of the cam, compressed air is generated by the elastic air bags, and the compressed air generated by the elastic air bags is sprayed out through the spray heads, so that the oxygen content of the sewage in the reactor is increased, and the sewage treatment effect is improved; meanwhile, oxygen sprayed by the spray head moves upwards to dredge the interior of the catalyst particle interlayer, so that sewage can be better contacted with a catalyst, organic matters in the sewage are decomposed under the dual effects of the catalyst and the irradiation of a photocatalytic light source, the sewage passes through the catalyst particle interlayer layer by layer to realize multi-stage treatment, the sewage treatment effect is ensured, the sewage passes through the catalyst particle interlayer and then enters a sedimentation tank, the treated sewage firstly flows into a sedimentation area due to the existence of a half baffle, the flow velocity of the water is reduced due to the existence of the baffle, the sewage sedimentation effect is improved, and upper clear water flows into a right clear water area to realize the separation of sediments; then, clear water flows out from the water outlet, and sediments flow out from the sewage outlet.
The stirring unit comprises a stirring shaft, an impeller II, an air cylinder, a connecting rod and a movable plate, the stirring shaft is vertically arranged in the reactor, and the upper end of the stirring shaft extends out of the reactor; the second impeller is arranged at the upper end of the stirring shaft, a gas outlet is formed in the top of the reactor and is positioned below the second impeller, and a pressure release valve is arranged at the position of the gas outlet; the movable plate is vertically arranged; one end of the air cylinder is hinged to the stirring shaft, the other end of the air cylinder is hinged to the end face of the movable plate, the air cylinder is connected with the elastic air bag through an air pipe, and one movable plate is provided with one air cylinder; the number of the connecting rods is the same as that of the air cylinders, one end of each connecting rod is hinged to the stirring shaft, and the other end of each connecting rod is hinged to the movable plate. Because the elastic air bag continuously blows the outside air into the reactor under the extrusion of the cam, the pressure in the reactor rises, when the pressure exceeds the set pressure of the pressure release valve, the gas is discharged from a gas outlet of the reactor, the discharged gas pushes the second impeller to rotate, the second impeller rotates to drive the stirring shaft to rotate, the stirring shaft rotates to enable the movable plate to stir the sewage in the reactor, the compressed air part generated by the air bag is supplied to the air cylinder in the process, the air cylinder acts, the movable plate swings due to the connection of the air cylinder and the connecting rod, the stirring effect is better, the aggregation of organic matters in the sewage is avoided, and the catalytic decomposition efficiency is improved.
The movable plate is divided into a left independent part and a right independent part, the two parts of the movable plate are connected through elastic cloth and a spring, a storage cavity is formed between the two parts of the movable plate, catalyst particles are arranged in the storage cavity, and a through hole is formed in the surface of the movable plate. When the movable plate swings and rotates in the sewage, the sewage enters the movable plate through the through holes, so that the sewage is better contacted with catalyst particles in the movable plate, and the catalytic decomposition effect is improved.
The activity board is improved level and is provided with the axis of rotation, and the axis of rotation middle part is rotated and is installed on the activity board, and the one end that the axis of rotation is located the storage intracavity is provided with the abrasive disc, and the abrasive disc is used for grinding the catalyst granule of storing the intracavity, gets rid of the inefficacy layer on catalyst granule surface, and the one end that the axis of rotation is located the activity board outside is provided with impeller three. When the movable plate rotates, the third impeller is driven to move in sewage, the third impeller rotates, the rotation of the third impeller drives the rotating shaft to rotate, the rotating shaft enables the grinding disc to move in the storage cavity, catalyst particles in the storage cavity are ground, and therefore effectiveness of the catalyst is guaranteed.
The top of the reactor is provided with a plastic interlayer, the plastic interlayer is provided with through holes, and the plastic interlayer is positioned below the rotating shaft. The existence of the plastic interlayer enables the sewage to uniformly flow into the reaction chamber, so that the catalyst particle interlayer can be fully contacted with the sewage, and the catalytic effect of the catalyst particle interlayer is improved.
The invention has the following beneficial effects:
1. the invention relates to a printing and dyeing wastewater treatment process, which adopts a mode of combining biological treatment and chemical treatment to comprehensively treat printing and dyeing wastewater, an adopted photocatalytic oxidation device drives an impeller I to rotate through impact force when sewage is pumped in, the rotation of the impeller I enables a cam to extrude an elastic air bag, compressed air generated by the elastic air bag is blown in from the lower part of a catalyst particle interlayer, on one hand, the oxygen content in the sewage is increased, on the other hand, the inside of the catalyst particle interlayer is dredged, the contact between a catalyst and the sewage is increased, and when gas is discharged out of a reactor, the gas is used as power to drive an impeller II to rotate, so that the impeller II drives a movable plate to move to stir the sewage, the catalytic oxidation decomposition efficiency is improved, the treated water quality is easier to reach the standard, and the process has the characteristics of low cost and high efficiency.
2. According to the printing and dyeing wastewater treatment process, the photocatalytic oxidation device adopted in the process is characterized in that the movable plate is arranged into two parts which are independent from each other left and right, the movable plate and the spring are connected to form the storage cavity, the catalyst is arranged in the storage cavity, the catalyst is in full contact with sewage by the movement of the movable plate, and the decomposition efficiency of organic matters in the wastewater is improved.
3. According to the printing and dyeing wastewater treatment process, the movable plate is provided with the rotating shaft, the grinding disc is arranged at one end of the rotating shaft, which is positioned in the storage cavity, the impeller III is arranged at the other end of the rotating shaft, and the impeller III is rotated by the movement of the movable plate in the sewage, so that the grinding disc is driven to grind the catalyst in the storage cavity, the exertion of the effectiveness of the catalyst is ensured, and the wastewater treatment effect is good.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 2;
in the figure: the device comprises a reactor 1, a photocatalytic light source 2, a catalyst particle interlayer 3, a stirring unit 4, a power unit 5, a reaction chamber 11, a control unit 6, a display key unit 7, a sedimentation tank 12, a half baffle 8, a partition plate 9, a sedimentation area 121, a clean water area 122, a sewage outlet 13, a water inlet 14, a water pump 15, a water outlet 16, an optical fiber sensor 17, a first impeller 51, a rotating shaft 52, a fixed frame 53, a cam 54, an elastic air bag 55, a spray head 56, a stirring shaft 41, a second impeller 42, an air cylinder 43, a connecting rod 44, a movable plate 45, an air outlet 18, elastic cloth 46, a storage cavity 451, a rotating shaft 47, a grinding disc 48, a third impeller 49 and a plastic interlayer 19.
Detailed Description
A printing and dyeing wastewater treatment process according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
As shown in figures 1 and 2, the printing and dyeing wastewater treatment process comprises the following steps:
s1: introducing the printing and dyeing wastewater into a pH value regulating tank, and regulating the pH value of the wastewater to 6-7;
s2: the effluent of the regulating reservoir in the S1 is connected into a photocatalytic oxidation device to decompose organic matters in the wastewater;
s3: the effluent of the photocatalytic oxidation device in the S2 is connected into a hydrolytic acidification tank, and the hydraulic retention time is 2-3 h;
s4: the effluent of the hydrolysis acidification tank in the S3 is connected into an activated sludge tank for treatment, and decolorization bacteria and PVA degrading bacteria are connected into the tank for reaction for 3-5 h;
s5: the sewage subjected to the activity treatment in the S4 is connected into a filtering tank, solid precipitates are filtered through the filtering tank, and effluent is discharged;
the photocatalytic oxidation device in the S2 comprises a reactor 1, a photocatalytic light source 2, a catalyst particle interlayer 3, a stirring unit 4 and a power unit 5, wherein the catalyst particle interlayer 3 is arranged below the top of the reactor 1 at intervals, the catalyst particle interlayer 3 is at least two layers, so that an internal cavity of the reactor 1 is divided into a plurality of reaction chambers 11 to realize a top-down multi-stage treatment structure, the photocatalytic light source 2 and the stirring unit 4 are arranged in the reactor 1, the photocatalytic light source 2 is electrically connected with an external control unit 6, the control unit 6 is electrically connected with a display key unit 7, and the stirring unit 4 is used for stirring sewage in the reactor 1; a sedimentation tank 12 is arranged at the bottom of the reactor 1, an inclined half baffle 8 is arranged between the bottom of the reactor 1 and the top of the sedimentation tank 12, vertical clapboards 9 which are staggered up and down are arranged between the bottom of the sedimentation tank 12 and the bottom of the half baffle 8, the sedimentation tank 12 is divided into a sedimentation zone 121 and a clear water zone 122, the bottom surface of the sedimentation zone 121 is inclined towards the tank wall of the sedimentation tank 12, and a drain outlet 13 is arranged at the lowest point of the tank wall of the sedimentation tank 12; the top of the reactor 1 is provided with a water inlet 14, the water inlet 14 is connected with a water pumping pipe and a water pump 15, a clear water area 122 of the sedimentation tank 12 is connected with a water outlet 16, optical fiber sensors 17 are arranged at the water inlet 14 and the water outlet 16, and the optical fiber sensors 17 are electrically connected with the control unit 6; the power unit 5 is arranged in the reactor 1, the power unit 5 is positioned below the water inlet 14, and the power unit 5 is used for blowing oxygen into the reactor 1 and providing power for the stirring unit 4; wherein the content of the first and second substances,
the power unit 5 comprises a first impeller 51, a rotating shaft 52, a fixed frame 53, a cam 54, an elastic air bag 55 and a spray head 56, wherein the first impeller 51 is arranged on the fixed frame 53 through the rotating shaft 52, and the first impeller 51 is positioned below the water inlet 14; the cam 54 is arranged on the rotating shaft 52, the inner wall of the reactor 1 is provided with an elastic air bag 55, the cam 54 is contacted with the elastic air bag 55 to compress the air bag, so that the elastic air bag 55 generates compressed air, the surface of the elastic air bag 55 is provided with an air inlet and an air outlet, the positions of the air inlet and the air outlet are respectively provided with a one-way valve, the air inlet extends to the outside of the reactor 1, and the air inlet is contacted with the outside air; the spray head 56 is arranged below the catalyst particle interlayer 3, and the spray head 56 is communicated with the air outlet of the air bag through a hose. When the sewage treatment device works, sewage to be treated is pumped into the reactor 1 from the water inlet 14 through the water pumping pipe by the water pumping pump 15, the impeller I51 is pushed to rotate by the impact force when the sewage flows out of the water inlet 14, the impeller I51 drives the cam 54 to rotate through the rotating shaft 52, the elastic air bag 55 is periodically compressed by the rotation of the cam 54, the elastic air bag 55 generates compressed air, and the compressed air generated by the elastic air bag 55 is sprayed out through the spray head 56, so that the oxygen content of the sewage in the reactor 1 is increased, and the sewage treatment effect is improved; meanwhile, oxygen sprayed by the spray head 56 dredges the inside of the catalyst particle interlayer 3 due to upward movement, so that sewage can be better contacted with a catalyst, organic matters in the sewage are decomposed under the dual action of the catalyst and the irradiation of the photocatalytic light source 2, the sewage passes through the catalyst particle interlayer 3 layer by layer to realize multi-stage treatment, the sewage treatment effect is ensured, the sewage enters the sedimentation tank 12 after passing through the catalyst particle interlayer 3, the treated sewage firstly flows into the sedimentation zone 121 due to the existence of the half baffle 8, the flow rate of water is reduced due to the existence of the baffle 9, the sewage sedimentation effect is improved, and upper clear water flows into the right clear water zone 122 to realize the separation of sediments; thereafter, the clean water flows out from the water outlet 16, and the sludge flows out from the sewage drain 13.
As shown in fig. 2, the stirring unit 4 comprises a stirring shaft 41, a second impeller 42, a cylinder 43, a connecting rod 44 and a movable plate 45, wherein the stirring shaft 41 is vertically installed inside the reactor 1, and the upper end of the stirring shaft 41 extends out of the reactor 1; the second impeller 42 is installed at the upper end of the stirring shaft 41, the top of the reactor 1 is provided with a gas outlet 18, the gas outlet 18 is positioned below the second impeller 42, and the position of the gas outlet 18 is provided with a pressure release valve; the movable plate 45 is vertically placed; one end of the air cylinder 43 is hinged on the stirring shaft 41, the other end of the air cylinder 43 is hinged with the end face of the movable plate 45, the air cylinder 43 is connected with the elastic air bag 55 through an air pipe, and one movable plate 45 is provided with one air cylinder 43; the number of the connecting rods 44 is the same as that of the air cylinders 43, one end of each connecting rod 44 is hinged to the stirring shaft 41, and the other end of each connecting rod 44 is hinged to the movable plate 45. Because the elastic air bag 55 continuously blows the outside air into the reactor 1 under the extrusion of the cam 54, the pressure in the reactor 1 rises, when the pressure exceeds the set pressure of the pressure relief valve, the gas is discharged from the gas outlet 18 of the reactor 1, the discharged gas pushes the second impeller 42 to rotate, the rotation of the second impeller 42 drives the stirring shaft 41 to rotate, the stirring shaft 41 rotates to enable the movable plate 45 to stir the sewage in the reactor 1, part of the compressed air generated by the air bag is supplied to the air cylinder 43 in the process, the air cylinder 43 acts, the movable plate 45 swings due to the connection of the air cylinder 43 and the connecting rod 44, the stirring effect is better, the accumulation of organic matters in the sewage is avoided, and the catalytic decomposition efficiency is improved.
As shown in fig. 3, the movable plate 45 is divided into two independent left and right parts, the two parts of the movable plate 45 are connected by an elastic cloth 46 and a spring, a storage chamber 451 is formed between the two parts of the movable plate 45, catalyst particles are disposed in the storage chamber 451, and a through hole is disposed on the surface of the movable plate 45. When the movable plate 45 swings and rotates in the sewage, the sewage enters the interior of the movable plate 45 through the through holes, so that the sewage is better contacted with the catalyst particles in the interior of the movable plate 45, and the catalytic decomposition effect is improved.
As shown in fig. 3, a rotating shaft 47 is horizontally arranged on the movable plate 45, the middle of the rotating shaft 47 is rotatably mounted on the movable plate 45, a grinding disc 48 is arranged at one end of the rotating shaft 47 located in the storage cavity 451, the grinding disc 48 is used for grinding the catalyst particles in the storage cavity 451 to remove the dead layer on the surface of the catalyst particles, and a third impeller 49 is arranged at one end of the rotating shaft 47 located outside the movable plate 45. When the movable plate 45 rotates, the third impeller 49 is driven to move in the sewage, so that the third impeller 49 rotates, the rotation of the third impeller 49 drives the rotating shaft 47 to rotate, the rotating shaft 47 enables the grinding disc 48 to move in the storage cavity 451, and the catalyst particles in the storage cavity 451 are ground, so that the effectiveness of the catalyst is ensured.
As shown in figure 2, the top of the reactor 1 is provided with a plastic partition 19, the plastic partition 19 is provided with through holes, and the plastic partition 19 is positioned below the rotating shaft 52. The existence of the plastic interlayer 19 enables the sewage to uniformly flow into the reaction chamber 11, so that the catalyst particle interlayer 3 can be fully contacted with the sewage, and the catalytic effect of the catalyst particle interlayer 3 is improved.
The specific process is as follows:
when the sewage treatment device works, sewage to be treated is pumped into the reactor 1 from the water inlet 14 through the water pumping pipe by the water pumping pump 15, the impeller I51 is pushed to rotate by the impact force when the sewage flows out of the water inlet 14, the impeller I51 drives the cam 54 to rotate through the rotating shaft 52, the elastic air bag 55 is periodically compressed by the rotation of the cam 54, the elastic air bag 55 generates compressed air, and the compressed air generated by the elastic air bag 55 is sprayed out through the spray head 56, so that the oxygen content of the sewage in the reactor 1 is increased, and the sewage treatment effect is improved; meanwhile, oxygen sprayed by the spray head 56 dredges the inside of the catalyst particle interlayer 3 due to upward movement, so that sewage can be better contacted with a catalyst, organic matters in the sewage are decomposed under the dual action of the catalyst and the irradiation of the photocatalytic light source 2, the sewage passes through the catalyst particle interlayer 3 layer by layer to realize multi-stage treatment, the sewage treatment effect is ensured, the sewage enters the sedimentation tank 12 after passing through the catalyst particle interlayer 3, the treated sewage firstly flows into the sedimentation zone 121 due to the existence of the half baffle 8, the flow rate of water is reduced due to the existence of the baffle 9, the sewage sedimentation effect is improved, and upper clear water flows into the right clear water zone 122 to realize the separation of sediments; thereafter, the clean water flows out from the water outlet 16, and the sludge flows out from the sewage drain 13.
Because the elastic air bag 55 continuously blows the outside air into the reactor 1 under the extrusion of the cam 54, the pressure in the reactor 1 rises, when the pressure exceeds the set pressure of the pressure relief valve, the gas is discharged from the gas outlet 18 of the reactor 1, the discharged gas pushes the second impeller 42 to rotate, the rotation of the second impeller 42 drives the stirring shaft 41 to rotate, the stirring shaft 41 rotates to enable the movable plate 45 to stir the sewage in the reactor 1, part of the compressed air generated by the air bag is supplied to the air cylinder 43 in the process, the air cylinder 43 acts, the movable plate 45 swings due to the connection of the air cylinder 43 and the connecting rod 44, the stirring effect is better, the accumulation of organic matters in the sewage is avoided, and the catalytic decomposition efficiency is improved. When the movable plate 45 swings and rotates in the sewage, the sewage enters the interior of the movable plate 45 through the through holes, so that the sewage is better contacted with the catalyst particles in the interior of the movable plate 45, and the catalytic decomposition effect is improved. When the movable plate 45 rotates, the third impeller 49 is driven to move in the sewage, so that the third impeller 49 rotates, the rotation of the third impeller 49 drives the rotating shaft 47 to rotate, the rotating shaft 47 enables the grinding disc 48 to move in the storage cavity 451, and the catalyst particles in the storage cavity 451 are ground, so that the effectiveness of the catalyst is ensured.
While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
Industrial applicability
According to the printing and dyeing wastewater treatment process, the printing and dyeing wastewater is comprehensively treated by combining biological treatment and chemical treatment, the adopted photocatalytic oxidation device drives the impeller I to rotate by the impact force generated when sewage is pumped, the rotation of the impeller I enables the cam to extrude the elastic air bag, compressed air generated by the elastic air bag is blown in from the lower part of the catalyst particle interlayer, on one hand, the oxygen content in the sewage is increased, on the other hand, the inside of the catalyst particle interlayer is dredged, the contact between a catalyst and the sewage is increased, the gas is discharged out of the reactor and used as power to drive the impeller II to rotate, so that the impeller II drives the movable plate to move to stir the sewage, the catalytic oxidation decomposition efficiency is improved, and the treated water quality is easier to reach the standard, and has the characteristics of low cost and high efficiency, so that the printing and dyeing wastewater treatment process is useful in the field of sewage treatment.
Claims (1)
1. A printing and dyeing wastewater treatment process is characterized in that: the process comprises the following steps:
s1: introducing the printing and dyeing wastewater into a pH value regulating tank, and regulating the pH value of the wastewater to 6-7;
s2: the effluent of the regulating reservoir in the S1 is connected into a photocatalytic oxidation device to decompose organic matters in the wastewater;
s3: the effluent of the photocatalytic oxidation device in the S2 is connected into a hydrolytic acidification tank, and the hydraulic retention time is 2-3 h;
s4: the effluent of the hydrolysis acidification tank in the S3 is connected into an activated sludge tank for treatment, and decolorization bacteria and PVA degrading bacteria are connected into the tank for reaction for 3-5 h;
s5: the sewage subjected to the activity treatment in the S4 is connected into a filtering tank, solid precipitates are filtered through the filtering tank, and effluent is discharged;
the photocatalytic oxidation device in the S2 comprises a reactor (1), a photocatalytic light source (2), a catalyst particle interlayer (3), a stirring unit (4) and a power unit (5), wherein the catalyst particle interlayer (3) is arranged below the top of the reactor (1) at intervals, the catalyst particle interlayer (3) is at least two layers, so that an internal cavity of the reactor (1) is divided into a plurality of reaction chambers (11), a top-down multi-stage treatment structure is realized, the photocatalytic light source (2) and the stirring unit (4) are arranged in the reactor (1), the photocatalytic light source (2) is electrically connected with an external control unit (6), the control unit (6) is electrically connected with a display key unit (7), and the stirring unit (4) is used for stirring sewage in the reactor (1); a sedimentation tank (12) is arranged at the bottom of the reactor (1), an inclined half baffle (8) is arranged between the bottom of the reactor (1) and the top of the sedimentation tank (12), vertical clapboards (9) which are staggered up and down are arranged between the bottom of the sedimentation tank (12) and the bottom of the half baffle (8), the sedimentation tank (12) is divided into a sedimentation zone (121) and a clear water zone (122), the bottom surface of the sedimentation zone (121) is inclined towards the tank wall of the sedimentation tank (12), and a drain outlet (13) is arranged at the lowest point of the tank wall of the sedimentation tank (12); a water inlet (14) is formed in the top of the reactor (1), the water inlet (14) is connected with a water pumping pipe and a water pump (15), a clear water area (122) of the sedimentation tank (12) is connected with a water outlet (16), optical fiber sensors (17) are arranged at the water inlet (14) and the water outlet (16), and the optical fiber sensors (17) are electrically connected with the control unit (6); the power unit (5) is arranged in the reactor (1), the power unit (5) is positioned below the water inlet (14), and the power unit (5) is used for blowing oxygen into the reactor (1) and providing power for the stirring unit (4) at the same time; wherein the content of the first and second substances,
the power unit (5) comprises a first impeller (51), a rotating shaft (52), a fixed frame (53), a cam (54), an elastic air bag (55) and a spray head (56), wherein the first impeller (51) is installed on the fixed frame (53) through the rotating shaft (52), and the first impeller (51) is positioned below the water inlet (14); the cam (54) is installed on the rotating shaft (52), the elastic air bag (55) is arranged on the inner wall of the reactor (1), the cam (54) is in contact with the elastic air bag (55) to compress the air bag, so that the elastic air bag (55) generates compressed air, the surface of the elastic air bag (55) is provided with an air inlet and an air outlet, the positions of the air inlet and the air outlet are respectively provided with a one-way valve, the air inlet extends to the outside of the reactor (1), and the air inlet is in contact with the outside air; the spray head (56) is arranged below the catalyst particle interlayer (3), and the spray head (56) is communicated with an air outlet of the air bag through a hose;
the stirring unit (4) comprises a stirring shaft (41), a second impeller (42), a cylinder (43), a connecting rod (44) and a movable plate (45), the stirring shaft (41) is vertically arranged inside the reactor (1), and the upper end of the stirring shaft (41) extends out of the reactor (1); the second impeller (42) is installed at the upper end of the stirring shaft (41), the top of the reactor (1) is provided with a gas outlet (18), the gas outlet (18) is positioned below the second impeller (42), and a pressure release valve is arranged at the position of the gas outlet (18); the movable plate (45) is vertically placed; one end of the air cylinder (43) is hinged to the stirring shaft (41), the other end of the air cylinder (43) is hinged to the end face of the movable plate (45), the air cylinder (43) is connected with the elastic air bag (55) through an air pipe, and one movable plate (45) is provided with the air cylinder (43); the number of the connecting rods (44) is the same as that of the air cylinders (43), one end of each connecting rod (44) is hinged to the stirring shaft (41), and the other end of each connecting rod (44) is hinged to the movable plate (45);
the movable plate (45) is divided into a left part and a right part which are independent, the two parts of the movable plate (45) are connected through an elastic cloth (46) and a spring, a storage cavity (451) is formed between the two parts of the movable plate (45), catalyst particles are arranged in the storage cavity (451), and through holes are formed in the surface of the movable plate (45);
a rotating shaft (47) is horizontally arranged on the movable plate (45), the middle part of the rotating shaft (47) is rotatably arranged on the movable plate (45), a grinding disc (48) is arranged at one end of the rotating shaft (47) positioned in the storage cavity (451), the grinding disc (48) is used for grinding the catalyst particles in the storage cavity (451) to remove a failure layer on the surface of the catalyst particles, and a third impeller (49) is arranged at one end of the rotating shaft (47) positioned outside the movable plate (45);
the top of the reactor (1) is provided with a plastic interlayer (19), the plastic interlayer (19) is provided with a through hole, and the plastic interlayer (19) is positioned below the rotating shaft (52).
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Address after: 053000 No. 369, Kaiyuan Road, high tech Zone, Hengshui City, Hebei Province Patentee after: Hengshui Kaitian Environmental Engineering Co.,Ltd. Address before: 053000 room 816, Hengshui Industrial New Area Management Committee, No. 1988, Yongxing West Road, Hengshui City, Hebei Province Patentee before: Hengshui Kaitian Environmental Engineering Co.,Ltd. |