CN111675444A - Treatment system for removing cellulose in papermaking wastewater - Google Patents
Treatment system for removing cellulose in papermaking wastewater Download PDFInfo
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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
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- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2001/007—Processes including a sedimentation step
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses a treatment system for removing cellulose in papermaking wastewater, which comprises a water collecting well, a coarse grid, a primary sedimentation tank, a pH value adjusting tank, an ultrasonic catalytic crosslinking-cellulose filter pressing separation system, an aeration tank, a biological oxidation filter tank, a secondary sedimentation tank and a water purifying tank. The system creatively utilizes the characteristic that cellulose can generate crosslinking reaction in the presence of certain weak acid substances, selects citric acid as a crosslinking agent, selects trisodium citrate as a catalyst, adds the citric acid into papermaking wastewater containing a large amount of natural cellulose and fully mixes the citric acid and the natural cellulose, and generates a cyclic anhydride-esterification reaction through the catalytic activation of ultrasonic waves to generate a cellulose gel substance with a space chemical crosslinking structure. The substance is insoluble in water and has flocculation property, so that the substance can also perform flocculation precipitation purification on high-concentration COD in the papermaking wastewater simultaneously, and the effect of removing cellulose and COD in the papermaking wastewater simultaneously is realized.
Description
Technical Field
The invention relates to a treatment system for removing cellulose in papermaking wastewater, and belongs to the field of wastewater treatment in environmental protection.
Background
The paper industry is the traditional water consumer in China and is also one of the important pollution sources causing water pollution. At present, the discharge amount of wastewater and COD discharge amount of the paper-making industry in China are the first of the discharge amounts of various industries, the pollution of the paper-making industry to water environment is the most serious, and the pollution control method not only is the first problem of pollution control of the paper-making industry in China, but also is the first problem of standard treatment of industrial wastewater in China. According to statistics, the discharge amount of the industrial wastewater of paper making and paper products in counties and over counties of China accounts for 18.6 percent of the total discharge amount of the national industry, wherein the discharge amount of the treatment reaches a scalar value which accounts for 49.3 percent of the total discharge amount of the industrial wastewater of the paper making industry. The papermaking wastewater is generated in each section from material preparation to papermaking, the types of the wastewater are various, the types of the contained pollutants are complex, and if the pollutants are not strictly treated, the wastewater and the pollutants can cause serious pollution to the environment. If the wastewater is directly discharged into rivers without treatment, the water source is seriously polluted, and a large amount of resource waste is also caused.
The production of paper industry is divided into two main process stages, i.e. pulping and papermaking. Pulping is to separate the fiber in the plant material to make pulp and then bleach; the papermaking process includes diluting the pulp, forming, squeezing, stoving and making paper. Both processes consume large amounts of water, about 100 tons (wood pulp) to 400 tons (straw pulp) per 1 ton of paper produced, most of which is discharged as waste water. The papermaking wastewater contains high COD and suspended matter concentration.
The waste water produced by pulping has the most serious pollution. The discharged waste water is black brown in color during pulp washing, and is called black liquor. About 10 tons of black liquor of 10 baume degrees (10 ° Be') are discharged per 1 ton of pulp produced. The concentration of pollutants in the black liquor is very high, BOD is as high as 5000-40000 mg/L, and the total amount of fibers is sometimes as high as more than 15% of the total amount of products. The wastewater discharged from the bleaching step also contains acids, alkalis, and the like. In the papermaking process, the waste water discharged from the front end of the paper machine, called white water, contains a large amount of fibers and fillers and sizing agents added during the production process, and is mostly a useful substance. Black and white liquors are the main wastewaters of the paper industry.
Another great feature of the paper-making waste water is that it contains a large amount of cellulose and lignin, is insoluble in water and organic solvents, and is hardly biodegradable. At present, the common cellulose treatment method in the paper industry of China comprises the following steps: slurry fishing process, anaerobic acidification reaction and the like.
(1) The slurry fishing process comprises the following steps:
a large amount of cellulose contained in the papermaking wastewater can be recycled to produce low-grade carton boards and packaging paper. At present, the more pulp fishing methods are an inclined sieve and a fiber recycling machine, and the two methods filter out cellulose blocks with larger volume in the wastewater through a physical filtering mode, but are difficult to filter cellulose with smaller volume, and do not contribute much to the overall improvement of the drainage water quality.
(2) Anaerobic acidification reaction:
the anaerobic acidification reaction is to utilize the biological action of anaerobic bacteria such as methanogens and the like, to control the temperature in the reaction container, so that the anaerobic bacteria can proliferate, the wastewater can be rapidly acidified, and the cellulose is subjected to biological metabolism, so that the cellulose is degraded into micromolecular organic matters and inorganic matters. However, the method requires a complicated process flow, and also requires large equipment investment and floor area, and is not suitable for large-scale popularization and application.
At present, the existing method for treating cellulose in papermaking wastewater has the problems of single technical route, unsatisfactory treatment effect, complex process and equipment, high cost, easy secondary pollution and the like. Therefore, there is a need to get rid of the existing treatment technical thought, develop a new way for treating the cellulose in the paper-making wastewater, and further develop a new form of cellulose treatment technology in the paper-making wastewater.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a treatment system for removing cellulose in papermaking wastewater, which comprises a water collecting well, a coarse grid, a primary sedimentation tank, a pH value adjusting tank, an ultrasonic catalytic crosslinking-cellulose filter pressing separation system, an aeration tank, a biological oxidation filter tank, a secondary sedimentation tank, a water purifying tank and the like; wherein, papermaking wastewater containing cellulose enters a water collecting well through a wastewater pipeline, centralized collection and preliminary stable adjustment are carried out at the water collecting well, an outlet of the water collecting well is connected with a coarse grid through a wastewater pipeline, large-diameter solid matters in the wastewater are removed at the water collecting well, an outlet of the coarse grid is connected with a primary sedimentation tank through a wastewater pipeline, insoluble matters in the wastewater are further removed at the water collecting well, an outlet of the primary sedimentation tank is connected with a pH value adjusting tank through a wastewater pipeline, the wastewater is precisely adjusted at the pH value, the pH value range of the outlet water of the pH value adjusting tank is 6.5-8.0 so as to meet the requirement of the inlet pH value of an ultrasonic catalysis crosslinking-cellulose filter pressing separation system, an outlet of the pH value adjusting tank is connected with the ultrasonic catalysis crosslinking-cellulose filter pressing separation system through a wastewater pipeline, and an outlet of the ultrasonic catalysis crosslinking-cellulose filter pressing separation system is connected with an aeration tank through, carry out preliminary oxidative decomposition through aerobic aeration process surplus COD in the waste water here and handle, the export of aeration tank passes through waste water pipeline connection biological oxidation filtering pond, carry out final advanced purification treatment to remaining COD of waste water here, the export in biological oxidation filtering pond passes through waste water pipeline connection secondary sedimentation tank, all detach the remaining insoluble material in the waste water here, waste water pipeline connection clean water basin is passed through in the export of secondary sedimentation tank, the export in clean water basin passes through the waste water pipeline and will pass through the outer row of the water of purifying after this system processing.
Wherein, the ultrasonic catalytic crosslinking-cellulose filter pressing separation system consists of a dosing premixing area, an ultrasonic catalytic crosslinking reaction area and a filter pressing tank, the foremost end of the system is provided with a water inlet valve, the water inlet valve is connected to the dosing premixing area through a pipeline, the top of the area is provided with 3 dosing nozzles, the middle part is provided with 1 stirring paddle, the dosing premixing area is connected to the ultrasonic catalytic crosslinking reaction area through a pipeline, the area is provided with 6 ultrasonic generators side by side, the ultrasonic catalytic crosslinking reaction area is connected to the filter pressing tank through a pipeline, the tank body is made of stainless steel, the top of the tank body is provided with 1 set of piston filter pressing device, the left side and the right side of the lower part of the tank body are respectively provided with 1 set of piston limiter, the left side below the piston limiter is provided with 1 set of electric mud pushing device, the right side is provided with a mud discharge port, and the, the lowest end of the tank body is provided with a drainage valve; the papermaking wastewater after pH value adjustment treatment (the pH value after treatment is 6.5-8.0) enters the system through a water inlet valve positioned at the foremost end of an ultrasonic catalytic crosslinking-cellulose filter pressing separation system, the wastewater firstly enters a dosing premixing area, at the moment, 3 dosing spray heads positioned at the top of the area add mixed solution of citric acid and trisodium citrate into the wastewater, the mixed solution is fully and uniformly mixed under the stirring of a stirring blade, then the wastewater enters an ultrasonic catalytic crosslinking reaction area through a pipeline, the diameter of the pipeline in the area is obviously reduced, the pressure of the wastewater is obviously increased, meanwhile, 6 ultrasonic generators start to work, ultrasonic waves with specific frequency are emitted to the wastewater in the pipeline, the cellulose and the citric acid can generate cyclic anhydride-esterification reaction under the triple catalytic action of the trisodium citrate, the larger pressure and the ultrasonic waves, the cellulose gel substance with a space chemical crosslinking structure is generated, the substance is insoluble in water and has flocculation property, flocculation can be generated in the wastewater, a large amount of COD in the wastewater is adsorbed and suspended substances are formed, then the substance enters a filter-pressing tank along with the wastewater, when enough wastewater is accumulated in the filter-pressing tank, a piston type filter-pressing device positioned at the top of the filter-pressing device is started to compress the wastewater in the tank body to the position of a piston stopper, the cellulose gel substance in the wastewater cannot pass through a stainless steel fine filter screen due to larger volume, and is intercepted on the stainless steel fine filter screen in the filter-pressing process, the content of the wastewater after filter-pressing treatment is obviously reduced, the wastewater is discharged out of the filter-pressing tank through the stainless steel fine filter screen and a water outlet valve and enters the next treatment process, and simultaneously, a large amount of COD in the wastewater is adsorbed in the cellulose gel substance intercepted on the stainless steel fine filter screen, and is filter-pressed and dehydrated, semi-dry sludge is formed and pushed by an electric mud pushing device positioned at the left lower part of the tank body, and is discharged out of the filter-pressing tank from a sludge discharge port positioned at the right lower part of the tank body, and is subjected to centralized recovery and additional treatment; the pH value adjusting tank is used for adjusting the pH value of the wastewater subjected to primary precipitation to 6.5-8.0 so as to meet the requirement of the pH value of inlet water of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system; wherein, the aeration tank is used for carrying out preliminary oxidative decomposition treatment on the residual COD in the wastewater through an aerobic aeration process; wherein, the biological oxidation filter tank is used for carrying out final advanced purification treatment on the residual COD of the wastewater.
In the ultrasonic catalytic crosslinking-cellulose filter pressing separation system, the working voltage of a dosing nozzle is 30V, the spraying pressure range is 10-35 kg, and the content of citric acid in the sprayed citric acid-trisodium citrate mixed solution is 18.3 percent, and the content of trisodium citrate is 1.7 percent.
The working voltage of an ultrasonic generator of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system is 30V, ultrasonic waves with the frequency range of 25500-28200 Hz can be emitted, and the service life of the ultrasonic generator is longer than 11000 h.
Wherein, the effective volume of the pressure filtration tank of the ultrasonic catalytic crosslinking-cellulose pressure filtration separation system is 320m3The working voltage of the piston type filter pressing device is 380V, and the rated power is 3.5 kW.
The cellulose removal efficiency of the wastewater treated by the system can reach 97.8%.
The invention has the advantages that:
(1) the system gets rid of the technical idea of treating cellulose in the prior papermaking wastewater, creatively utilizes the characteristic that the cellulose can generate cross-linking reaction in the presence of certain weak acid substances, uses proper cross-linking reaction medicament and catalyst, utilizes the catalytic activation effect of ultrasonic waves to enable the cellulose to generate cyclic anhydride-esterification reaction to generate a cellulose gel substance which is insoluble in water and has flocculation property, and can effectively remove the cellulose in the wastewater through pressure filtration operation, wherein the treatment efficiency can reach 97.8 percent.
(2) Because the gel substance generated by the cellulose crosslinking reaction has the flocculation property, the gel substance can generate flocculation precipitation reaction with COD contained in the wastewater when the gel substance is generated by the reaction, so that the content of the COD in the wastewater is obviously reduced, the effect of simultaneously removing the cellulose and the COD in the papermaking wastewater is realized, and the subsequent treatment cost of the wastewater is greatly saved.
(3) The system adopts citric acid as a cross-linking agent and trisodium citrate as a catalyst, and the two agents are nontoxic and harmless, so that the risk of introducing new pollutants with higher harm is eliminated.
(4) The system has the advantages of simple and easy principle, lower design and construction cost, better treatment effect and low operation and maintenance cost, and is favorable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
In the figure: 1-water collecting well, 2-coarse grid, 3-primary sedimentation tank, 4-pH value adjusting tank, 5-ultrasonic catalytic crosslinking-cellulose filter pressing separation system, 6-aeration tank, 7-biological oxidation filter tank, 8-secondary sedimentation tank and 9-water purifying tank
FIG. 2 is a schematic diagram of an ultrasonic catalyzed cross-linking-cellulose filter-press separation system.
51-water inlet valve, 52-dosing spray head, 53-stirring paddle, 54-ultrasonic generator, 55-piston type filter pressing device, 56-piston limiter, 57-electric mud pushing device, 58-stainless steel fine filter screen, 59-sludge discharge port and 510-drainage valve.
Detailed Description
As shown in fig. 1, the treatment system for removing cellulose in paper-making wastewater comprises a water collecting well 1, a coarse grid 2, a primary sedimentation tank 3, a pH value adjusting tank 4, an ultrasonic catalytic crosslinking-cellulose filter-pressing separation system 5, an aeration tank 6, a biological oxidation filter tank 7, a secondary sedimentation tank 8, a water purifying tank 9 and the like; wherein, papermaking wastewater containing cellulose enters a water collecting well 1 through a wastewater pipeline for centralized collection and preliminary stable adjustment, an outlet of the water collecting well 1 is connected with a coarse grating 2 through a wastewater pipeline for removing large-diameter solid matters in the wastewater, an outlet of the coarse grating 2 is connected with a primary sedimentation tank 3 through a wastewater pipeline for further removing insoluble matters in the wastewater, an outlet of the primary sedimentation tank 3 is connected with a pH value adjusting tank 4 through a wastewater pipeline for precisely adjusting the pH value of the wastewater, the pH value range of the outlet water of the pH value adjusting tank 4 is 6.5-8.0 so as to meet the requirement of the pH value of the inlet water of an ultrasonic catalysis crosslinking-cellulose filter pressing separation system 5, an outlet of the pH value adjusting tank 4 is connected with the ultrasonic catalysis crosslinking-cellulose filter pressing separation system 5 through a wastewater pipeline, an outlet of the ultrasonic catalysis crosslinking-cellulose filter pressing separation system 5 is connected with an aeration tank 6 through a wastewater pipeline, the residual COD in the wastewater is subjected to primary oxidative decomposition treatment through an aerobic aeration process, the outlet of an aeration tank 6 is connected with a biological oxidation filter tank 7 through a wastewater pipeline, the residual COD in the wastewater is subjected to final deep purification treatment, the outlet of the biological oxidation filter tank 7 is connected with a secondary sedimentation tank 8 through a wastewater pipeline, residual insoluble substances in the wastewater are completely removed, the outlet of the secondary sedimentation tank 8 is connected with a water purification tank 9 through a wastewater pipeline, and the outlet of the water purification tank 9 discharges purified effluent treated by the system through a wastewater pipeline; wherein the fibers are crosslinked by ultrasonic catalysisThe vitamin filter-pressing separation system 5 consists of a dosing premixing area, an ultrasonic catalytic cross-linking reaction area and a filter-pressing tank, wherein the foremost end of the system is provided with a water inlet valve 51, the water inlet valve 51 is connected to the dosing premixing area through a pipeline, the top of the area is provided with 3 dosing nozzles 52, the middle part of the area is provided with 1 stirring paddle 53, the dosing premixing area is connected to the ultrasonic catalytic cross-linking reaction area through a pipeline, the area is provided with 6 ultrasonic generators 54 side by side, the ultrasonic catalytic cross-linking reaction area is connected to the filter-pressing tank through a pipeline, the tank body is made of stainless steel, the top of the tank body is provided with 1 set of piston filter-pressing device 55, the left side and the right side of the lower part of the tank body are respectively provided with 1 set of piston limiter 56, the left side below the piston limiter 56 is provided with 1 set of electric mud pushing device 57, the lowest end of the tank body is provided with a drain valve 510; the papermaking wastewater after pH value adjustment treatment (the pH value after treatment is 6.5-8.0) enters the system through a water inlet valve 51 positioned at the foremost end of an ultrasonic catalytic crosslinking-cellulose filter pressing separation system 5, the wastewater firstly enters a dosing premixing area, at the moment, 3 dosing spray heads 52 positioned at the top of the area add mixed solution of citric acid and trisodium citrate into the wastewater, the mixed solution is fully and uniformly mixed under the stirring of a stirring blade 53, then the wastewater enters an ultrasonic catalytic crosslinking reaction area through a pipeline, the diameter of the pipeline in the area is obviously reduced, the pressure of the wastewater is obviously increased, meanwhile, 6 ultrasonic generators 54 start to work to emit ultrasonic waves with specific frequency to the wastewater in the pipeline, and the cellulose in the wastewater and the citric acid can generate cyclic anhydride-esterification reaction under the triple catalytic action of the trisodium citrate, the higher pressure and the ultrasonic waves, a cellulose gel substance with a space chemical crosslinking structure is generated, the substance is insoluble in water, has flocculation property and can generate flocculation action in wastewater to adsorb a large amount of COD in the wastewater and form suspended matters, then the suspended matters enter a filter-pressing tank along with the wastewater, when enough wastewater is accumulated in the filter-pressing tank, a piston type filter-pressing device 55 positioned at the top of the filter-pressing device is started to compress the wastewater in the tank body to the position of a piston limiter 56, and the cellulose gel substance in the wastewater cannot pass through a stainless steel fine filter screen 58 due to large volume, and can be trapped in the filter-pressing process without being trappedThe COD content of the wastewater subjected to filter pressing treatment is remarkably reduced on the stainless steel fine filter screen 58, the wastewater is discharged out of the filter pressing tank through the stainless steel fine filter screen 58 and the water outlet valve 510 and enters the next treatment process, meanwhile, a large amount of COD in the wastewater is adsorbed in cellulose gel substances intercepted on the stainless steel fine filter screen 58, semi-dry sludge is formed after filter pressing and dehydration, the sludge is pushed by an electric mud pushing device 57 positioned at the left lower part of the tank body, the sludge is discharged out of the filter pressing tank from a sludge discharge port 59 positioned at the right lower part of the tank body, and the sludge is subjected to centralized recovery and additional treatment; the pH value adjusting tank 4 is used for adjusting the pH value of the wastewater subjected to primary precipitation to 6.5-8.0 so as to meet the requirement of the pH value of inlet water of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system 5; wherein, the aeration tank 6 is used for carrying out preliminary oxidative decomposition treatment on the residual COD in the wastewater through an aerobic aeration process; the biological oxidation filter 7 is used for carrying out final deep purification treatment on COD (chemical oxygen demand) remained in the wastewater, wherein the working voltage of the chemical adding spray nozzle 52 of the ultrasonic catalytic cross-linking-cellulose filter pressing separation system 5 is 30V, the spraying pressure range is 10-35 kg, the content of citric acid in the sprayed citric acid-trisodium citrate mixed solution is 18.3%, and the content of trisodium citrate is 1.7%; in the ultrasonic catalytic crosslinking-cellulose filter pressing separation system 5, the working voltage of an ultrasonic generator 54 is 30V, ultrasonic waves with the frequency range of 25500-28200 Hz can be emitted, and the service life is longer than 11000 h; wherein, the effective volume of the filter pressing tank of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system 5 is 320m3The working voltage of the piston type filter pressing device 55 is 380V, and the rated power is 3.5 kW.
The cellulose removal efficiency of the wastewater treated by the system can reach 97.8%.
Claims (1)
1. A treatment system for removing cellulose in papermaking wastewater is characterized by comprising a water collecting well, a coarse grid, a primary sedimentation tank, a pH value adjusting tank, an ultrasonic catalytic crosslinking-cellulose filter pressing separation system, an aeration tank, a biological oxidation filter tank, a secondary sedimentation tank, a water purifying tank and the like; the papermaking wastewater containing cellulose enters a water collecting well through a wastewater pipeline, the outlet of the water collecting well is connected with a coarse grating through a wastewater pipeline, the outlet of the coarse grating is connected with a primary sedimentation tank through a wastewater pipeline, the outlet of the primary sedimentation tank is connected with a pH value adjusting tank through a wastewater pipeline, the outlet of the pH value adjusting tank is connected with an ultrasonic catalytic crosslinking-cellulose filter-pressing separation system through a wastewater pipeline, the outlet of the ultrasonic catalytic crosslinking-cellulose filter-pressing separation system is connected with an aeration tank through a wastewater pipeline, the outlet of the aeration tank is connected with a biological oxidation filter tank through a wastewater pipeline, the outlet of the biological oxidation filter tank is connected with a secondary sedimentation tank through a wastewater pipeline, the outlet of the secondary sedimentation tank is connected with a water purifying tank through a wastewater pipeline, and the outlet of the water purifying tank discharges purified effluent treated by the system through; wherein, the ultrasonic catalytic crosslinking-cellulose filter pressing separation system consists of a dosing premixing area, an ultrasonic catalytic crosslinking reaction area and a filter pressing tank, the foremost end is provided with a water inlet valve, the water inlet valve is connected to the dosing premixing area through a pipeline, the top of the dosing premixing area is provided with 3 dosing nozzles, the middle part is provided with 1 stirring paddle, the dosing premixing area is connected to the ultrasonic catalytic crosslinking reaction area through a pipeline, the ultrasonic catalytic crosslinking reaction area is provided with 6 ultrasonic generators side by side, the ultrasonic catalytic crosslinking reaction area is connected to the filter pressing tank through a pipeline, the top of the filter pressing tank is provided with 1 set of piston filter pressing device, the left and right sides of the lower part of the filter pressing tank body are respectively provided with 1 set of piston limiter, the left side below the piston limiter is provided with 1 set of electric mud pushing device, the right side is provided with a mud discharge port, the below the piston limiter is provided with 1, the lowest end of the filter-pressing tank body is provided with a drainage valve;
the papermaking wastewater treated by the pH value adjusting tank enters an ultrasonic catalytic crosslinking-cellulose filter pressing separation system through a water inlet valve positioned at the foremost end of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system, the wastewater firstly enters a dosing premixing area, 3 dosing nozzles positioned at the top of the dosing premixing area add citric acid and trisodium citrate mixed solution into the wastewater, the citric acid and trisodium citrate mixed solution is fully and uniformly mixed under the stirring of a stirring blade, the wastewater then enters an ultrasonic catalytic crosslinking reaction area through a pipeline, the diameter of the pipeline of the ultrasonic catalytic crosslinking reaction area is obviously reduced, the pressure of the wastewater is obviously increased, and meanwhile 6 parts of ultrasonic catalytic crosslinking reaction area are subjected to ultrasonic treatmentThe generator starts to work, ultrasonic waves with specific frequency are emitted to the wastewater in the pipeline, the wastewater is subjected to cyclic anhydride-esterification reaction with cellulose and citric acid under the triple catalytic action of trisodium citrate, large pressure and the ultrasonic waves to generate a cellulose gel substance with a space chemical crosslinking structure, the substance is insoluble in water and has flocculation property, flocculation is generated in the wastewater to adsorb a large amount of COD in the wastewater and form suspended substances, then the suspended substances enter the pressure filtration tank along with the wastewater, when enough wastewater is accumulated in the pressure filtration tank, a piston type pressure filtration device positioned at the top of the pressure filtration tank is started to compress the wastewater in the tank body of the pressure filtration tank to the position of a piston limiter, and the wastewater after pressure filtration treatment cannot pass through a stainless steel fine filter screen due to the large volume of the cellulose gel substance in the wastewater, is intercepted on the stainless steel fine filter screen in the pressure filtration process, the COD content is obviously reduced, the sludge is discharged out of the filter-pressing tank through a stainless steel fine filter screen and a water outlet valve, the sludge enters the next treatment process, a large amount of COD in the wastewater is adsorbed in cellulose gel substances intercepted on the stainless steel fine filter screen, semi-dry sludge is formed after filter pressing and dehydration, the sludge is pushed by an electric mud pushing device positioned at the left lower part of a filter-pressing tank body, the sludge is discharged out of the filter-pressing tank from a sludge discharge port positioned at the right lower part of the filter-pressing tank body, and the sludge is subjected to centralized recovery and then is treated additionally; the working voltage of a dosing spray head of the ultrasonic catalytic crosslinking-cellulose filter pressing separation system is 30V, the mass content of citric acid in the sprayed citric acid-trisodium citrate mixed solution is 18.3 percent, the mass content of trisodium citrate is 1.7 percent, and the effective volume of a filter pressing tank is 320m3The working voltage of the piston type filter pressing device is 380V, and the rated power is 3.5 kW.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106007231A (en) | 2016-10-12 |
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