CN116332455A - Method for decomposing sludge by using ultrasonic low-temperature thermokalite biochemical hydrolysis reactor - Google Patents
Method for decomposing sludge by using ultrasonic low-temperature thermokalite biochemical hydrolysis reactor Download PDFInfo
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- CN116332455A CN116332455A CN202310317688.5A CN202310317688A CN116332455A CN 116332455 A CN116332455 A CN 116332455A CN 202310317688 A CN202310317688 A CN 202310317688A CN 116332455 A CN116332455 A CN 116332455A
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- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 70
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- 238000000034 method Methods 0.000 title claims abstract description 33
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 69
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000003814 drug Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
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- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 23
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- 150000004676 glycans Chemical class 0.000 description 12
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- 102000004190 Enzymes Human genes 0.000 description 10
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- YVNQAIFQFWTPLQ-UHFFFAOYSA-O [4-[[4-(4-ethoxyanilino)phenyl]-[4-[ethyl-[(3-sulfophenyl)methyl]amino]-2-methylphenyl]methylidene]-3-methylcyclohexa-2,5-dien-1-ylidene]-ethyl-[(3-sulfophenyl)methyl]azanium Chemical compound C1=CC(OCC)=CC=C1NC1=CC=C(C(=C2C(=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S(O)(=O)=O)C)C=2C(=CC(=CC=2)N(CC)CC=2C=C(C=CC=2)S(O)(=O)=O)C)C=C1 YVNQAIFQFWTPLQ-UHFFFAOYSA-O 0.000 description 1
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Images
Classifications
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
Abstract
The invention relates to a sludge ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which comprises: the method comprises the steps of enabling the bottom of a reaction kettle to be in an inverted cone shape, enabling the top cover to be arranged at the upper end of the reaction kettle, enabling the stirring shaft to penetrate through the top cover and extend into the reaction kettle, enabling the upper end of the stirring shaft to be connected with the motor, enabling the lower end of the stirring shaft to be connected with the impeller blade, enabling a mud inlet and a medicine inlet to be respectively formed in the top cover, enabling the feeding pump to be connected with the mud inlet through a first control valve, enabling the medicine inlet to be connected with the medicine inlet through a second control valve, enabling the medicine outlet to be formed in the bottom of the reaction kettle, enabling the discharging pump to be connected with the discharging port through a third control valve, enabling the amplitude transformer to penetrate through the top cover and be inserted into the liquid level of the reaction kettle, enabling the amplitude transformer to be connected with the ultrasonic generator, enabling the steam inlet to be formed in the side wall close to the bottom of the reaction kettle, and enabling the steam generator to be connected with the steam inlet through a sixth control valve. Feeding, heating, feeding and discharging.
Description
Technical Field
The invention relates to the field of municipal sludge treatment processes, in particular to a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor.
Background
Currently, a key technology for the hydrolysis of sludge is the destruction technology of EPS (extracellular polymeric substances) and cell membranes in sludge. The destruction technology of EPS and cell membrane mainly comprises ozone oxidation technology, acid thermal hydrolysis technology, alkali thermal hydrolysis technology, biological enzyme technology and the like. Low temperature alkaline hydrolysis techniques are now most commonly used in the industry in the hydrolysis process of sludge. After the sludge is hydrolyzed, the dissolved protein can be used as a feed protein additive in agriculture.
The low-temperature pyrolysis sludge hydrolysis technology is characterized in that cell rupture is caused by destroying cell walls and cell membranes of microorganisms under the thermal effect, and the addition of alkali can promote dissociation and expansion of residual sludge flocs, meanwhile, the loose residual sludge state is favorable for heat transfer, and the alkali-heat combined hydrolysis can accelerate cell rupture to release intracellular substances, promote the hydrolysis of residual sludge and improve the concentration of protein in hydrolyzed clear liquid.
The method of the low-temperature pyrolysis sludge hydrolysis technology transfers protein in the surplus sludge from a solid phase to a liquid phase after the surplus sludge is subjected to alkali-heat combined hydrolysis, so that the protein in the surplus sludge is effectively dissolved out, and meanwhile, the dehydration performance of the surplus sludge after the alkali-heat combined hydrolysis is also greatly improved.
The low-temperature thermal alkali sludge hydrolysis technology is to destroy the residual sludge floc structure by thermal effect and further destroy the cell structure of microorganisms, so that organic matters such as protein, polysaccharide and the like in the cells are released; in addition, the addition of the alkaline substance can reduce the heat resistance of microbial cells and inhibit the activity of the cells, meanwhile, the alkaline substance can also generate saponification reaction with phospholipid bilayer on cell membranes to cause the destruction of the microbial cells, and the microbial cells of the residual sludge are easier to expand and dissolve and cause the release of more intracellular organic matters under the chemical and ionization dual effects of the alkaline substance.
The low-temperature alkaline sludge hydrolysis technology mainly realizes the low-temperature sludge reaction at about 50 ℃ by adding hot steam into a sludge hydrolysis reactor. Adding reaction substances such as alkaline additives such as CaO and the like into the reactor while introducing hot steam, thereby realizing wall breaking of the sludge cell wall and precipitation of intracellular proteins. The precipitated protein in the sludge cells realized by the low-temperature alkaline sludge hydrolysis technology can be used as a feed additive in the agricultural industry.
The low-temperature alkaline sludge hydrolysis technology at present has more general damage capability to cell walls in sludge when carrying out sludge hydrolysis. After cell wall destruction in sludge is performed by using low-temperature alkaline sludge hydrolysis technology, the concentration of substances such as protein liquid and extracellular polymer oozed out of cells is still at a low level, and the dewatering capacity of the sludge hydrolyzed by the technology is close to the limit.
Disclosure of Invention
The invention aims to overcome the defects of the existing low-temperature pyrolysis sludge hydrolysis technology and provides a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor.
In order to accomplish the object of the present application, the present application adopts the following technical scheme:
the invention relates to a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which comprises the following steps: the device comprises a reaction kettle, a top cover, a motor, a stirring shaft, impeller blades, a feed pump, a medicine feeding pump, a steam generator, a discharge pump, an ultrasonic generator, an amplitude transformer, a PH meter, a thermometer, a liquid level meter and an electric cabinet, wherein the bottom of the reaction kettle is in an inverted cone shape;
wherein: the method for decomposing sludge by using the ultrasonic low-temperature thermokalite biochemical hydrolysis reactor comprises the following steps:
(one), feeding
Wet sludge with the sludge concentration of 10000mg/L-15000mg/L enters the reaction kettle from the feeding pump, and when the sludge reaches the position of 2/3 of the volume of the reaction kettle, the feeding is stopped;
(II) heating
Starting a steam generator, introducing hot steam into a reaction kettle for heating, keeping the temperature in the reaction kettle at 45-55 ℃, and starting a motor at the same time, wherein the motor drives an impeller to stir at a rotating speed of 300-400 rpm;
(III) charging
Adding CaO solution with the concentration of 20% into a reaction kettle from a feed pump, monitoring the numerical value of a PH meter, stopping adding CaO solution when the PH detected by the PH meter reaches 8-9, adding serine protease solution from the feed pump, and adding serine protease solution according to the volume mass of sludge and the mass ratio of 60 mg/g; simultaneously starting an ultrasonic generator of 80kw to keep the sound energy density in the reaction kettle at 3-4w/ml, setting the running time of the ultrasonic generator to 25 min/time, intermittently running the ultrasonic generator at intervals of 5min, and inserting an amplitude transformer to a position 10cm below the surface of the sludge liquid after the ultrasonic generator is started;
(IV) discharging
According to the steps, after reacting for 2.5-3 hours, stopping the motor, the steam generator and the ultrasonic generator, then starting the fourth control valve, starting the third control valve and the discharge pump, and discharging the sludge.
The invention relates to a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which is characterized by comprising the following steps of: a sampling port is arranged on the inverted cone part of the reaction kettle close to the discharge port, and the sampling port is connected with a fourth control valve.
The invention relates to a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which is characterized by comprising the following steps of: the outside of the reaction kettle is also coated with a sound insulation layer.
The invention relates to a method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which is characterized by comprising the following steps of: the reaction kettle is made of stainless steel.
The ultrasonic cell disruption device provided by the invention utilizes cavitation effect generated by ultrasonic waves in sludge to disrupt cell walls. The energy converter in the ultrasonic cell disruption device generates high-intensity shearing force in the sludge by the amplitude transformer, and high-frequency alternating water pressure is formed in the sludge, so that cell cavities in the sludge are expanded and exploded to break cells. The ultrasonic wave produces a strong disturbance in the propagation of the sludge, so that the sludge particles produce a great acceleration, and the sludge particles collide with each other or the wall to break up cells. The disturbance of the ultrasonic wave exceeds the effect achieved by ordinary mechanical stirring and mashing. The transducer in the ultrasonic cell disruption device performs longitudinal mechanical vibration, and the vibration wave generates cavitation on cells through the titanium alloy amplitude transformer immersed in the sludge, so as to achieve the effect of cell disruption.
The invention improves the damage capability of the low-temperature hydrolysis process of the sludge to the cell wall in the sludge through the cell wall breaking and crushing functions of ultrasonic waves, thereby improving the exudation of protein liquid in cells and the precipitation of extracellular polymers such as polysaccharide during sewage hydrolysis. And simultaneously improves the dehydration capability of the sludge after the hydrolysis reaction.
The invention creatively uses a biological enzyme method, utilizes the hydrolysis of enzyme to destroy the cell wall and the cell membrane of the residual sludge and releases the intracellular protein of the microorganism. Enzymes are relatively sensitive to temperature and pH due to their nature. In the enzyme-catalyzed reaction, the activity of the enzyme is greatly affected by temperature. The enzyme activity is weaker at lower temperature, and the enzyme activity is gradually increased along with the rise of the temperature; when a certain temperature is exceeded, the enzyme activity gradually decreases again. And each enzyme has a certain difference in proper temperature and pH value due to its own characteristics.
The key point of the invention is to creatively and reasonably combine the ultrasonic cell wall breaking technology and the enzymatic biochemical hydrolysis technology with the low-temperature alkaline sludge hydrolysis technology. The cell wall breaking capability of the low-temperature alkaline hydrolysis technology is enhanced by utilizing the breaking effect of the ultrasonic cell wall breaking technology and the enzymatic biochemical hydrolysis on the cell wall.
Drawings
FIG. 1 is a schematic diagram of a forward section of a low temperature thermokalite biochemical hydrolysis reactor for sludge ultrasonic waves in the apparatus of the present invention;
FIG. 2 is a graph showing the comparison of crude protein concentration in the hydrolysate in the reaction kettle under similar experimental conditions in different experimental devices;
FIG. 3 is a graph showing the comparison of the concentration of soluble proteins in the hydrolysis solution in the reaction kettle under similar experimental conditions in different experimental devices;
FIG. 4 is a graph showing the comparison of the concentration of soluble polysaccharide in the hydrolysis solution in the reaction kettle under similar experimental conditions in different experimental devices;
FIG. 5 is a graph showing the comparison of crude protein content in hydrolysis residues in a reaction kettle under similar experimental conditions in different experimental devices;
FIG. 6 is a graph showing the comparison of protein content in hydrolysis residues in a reaction kettle under similar experimental conditions in different experimental devices;
FIG. 7 is a graph showing the comparison of polysaccharide content in hydrolysis residues in a reaction vessel under similar experimental conditions in different experimental apparatuses.
In fig. 1, reference numeral 1 denotes a feed pump; reference numeral 2 is a first control valve; reference numeral 3 is a horn; the reference numeral 4 is a mud inlet; reference numeral 5 is a top cover; reference numeral 6 is a motor; reference numeral 7 denotes a medicine inlet; reference numeral 8 denotes a second control valve; reference numeral 9 is an ultrasonic generator; reference numeral 10 denotes a drug feeding pump; reference numeral 11 is a level gauge; reference numeral 12 is a thermometer; reference numeral 13 is a PH meter; reference numeral 14 is an electric cabinet; reference numeral 15 is a discharge port; reference numeral 16 is a third control valve; reference numeral 17 is a discharge pump; reference numeral 18 is a fourth control valve; reference numeral 19 is a sampling port; reference numeral 20 denotes a steam generator; reference numeral 21 denotes a fifth control valve; reference numeral 22 is a water inlet; reference numeral 23 is a sixth control valve; reference numeral 24 denotes a steam inlet; reference numeral 25 denotes an impeller; reference numeral 26 denotes a sound insulation layer; reference numeral 27 is a reaction kettle; reference numeral 28 is a stirring shaft.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.
As shown in fig. 1, the ultrasonic low-temperature thermokalite biochemical hydrolysis reactor for sludge of the present invention comprises: the reactor comprises a reaction kettle 27, a top cover 5, a motor 6, a stirring shaft 28, impeller blades 25, a feeding pump 1, a medicine feeding pump 10, a steam generator 20, a discharge pump 17, an ultrasonic generator 9, an amplitude transformer 3, a PH meter 13, a thermometer 12, a liquid level meter 11 and an electric cabinet 14, wherein the bottom of the reaction kettle 27 is in an inverted cone shape, the top cover 5 is arranged at the upper end of the reaction kettle 27, the stirring shaft 28 penetrates through the top cover 5 and stretches into the reaction kettle 27, the upper end of the stirring shaft 28 is connected with the motor 6, the lower end of the stirring shaft 28 is connected with the impeller blades 25, a mud inlet 4 and a medicine inlet 7 are respectively formed in the top cover 5, the feeding pump 1 is connected with the mud inlet 4 through a first control valve 2, the medicine feeding pump 10 is connected with the medicine inlet 7 through a second control valve 8, the discharge port 15 is formed in the bottom of the reaction kettle 27, the discharge pump 17 is connected with the discharge port 15 through a third control valve 16, a sound insulation layer 26 is further coated on the outer side of the reaction kettle 27, and the reaction kettle 27 is made of stainless steel.
The two amplitude transformers 3 are inserted into the liquid level of the reaction kettle 27 through the top cover 5, the amplitude transformers 3 are connected with the ultrasonic generator 9, the steam inlet 24 is formed in the side wall close to the bottom of the reaction kettle 27, the steam generator 20 is connected with the steam inlet 24 through the sixth control valve 23, the steam generator 23 is also provided with a water inlet 22, and the water inlet pipe is connected with the water inlet 22 through the fifth control valve 21; the PH meter 13, the thermometer 12 and the liquid level meter 11 are respectively arranged on the side wall of the reaction kettle 27 and are respectively connected with the electric cabinet 14, and the electric cabinet 14 is respectively connected with the ultrasonic generator 9, the steam generator 20, the feed pump 1, the medicine feeding pump 10 and the discharge port 15; a sampling port 19 is arranged at the back taper part of the reaction kettle 27 close to the discharge port 15, and the sampling port 19 is connected with a fourth control valve 18.
The method for decomposing sludge by using the ultrasonic low-temperature thermokalite biochemical hydrolysis reactor comprises the following steps:
(one), feeding
The wet sludge with the sludge concentration of 10000mg/L-15000mg/L enters the reaction kettle 27 from the feeding pump 1, and when the sludge reaches the position of 2/3 of the volume of the reaction kettle 27, the feeding is stopped;
(II) heating
Starting a steam generator 20, introducing hot steam into a reaction kettle 27 for heating, keeping the temperature in the reaction kettle 27 at 45-55 ℃, starting a motor 6, and driving an impeller (25) to stir at a rotating speed of 300-400 rpm by the motor 6;
(III) charging
Adding CaO solution with the concentration of 20% into a reaction kettle 27 from a feed pump 10, monitoring the value of a PH meter 13, stopping adding CaO solution when the PH detected by the PH meter 13 reaches 8-9, adding serine protease solution from the feed pump 10, adding serine protease solution according to the volume mass of sludge according to the mass ratio of 60mg/g, simultaneously starting an ultrasonic generator 9 with the concentration of 80kw, keeping the sound energy density in the reaction kettle 27 at 3-4w/ml, setting the running time of the ultrasonic generator 9 to 25 min/time, intermittently running for 5min at intervals between running time, and inserting an amplitude transformer 3 to 10cm below the surface of the sludge liquid after the ultrasonic generator 20 is started;
(IV) discharging
After the reaction for 2.5-3 hours, the motor 6, the steam generator 20 and the ultrasonic generator 9 are stopped, the fourth control valve 18 is opened, the third control valve 16 and the discharge pump 17 are opened, and the sludge is discharged.
As shown in fig. 2, experiments are compared with the coupling reactor of low-temperature alkaline sludge hydrolysis technology, ultrasonic cell disruption technology and enzyme biological reaction and the single low-temperature alkaline sludge hydrolysis reactor to break the wall effect of sludge hydrolysis cells, and the difference of the effects of the reactors on different principles is analyzed through the comparison experiments. The existing reactor 1 adopts a low-temperature alkaline hydrolysis reactor, and adopts a wet sludge pump with the sludge concentration of 150000mg/L to be pumped into a reaction kettle. Adding CaO solution with the concentration of 20 percent, and controlling the PH value in the reactor to be 8. Introducing hot steam and controlling the temperature in the reaction kettle at 50 ℃. The stirring blade was turned on and the reaction time was 3 hours. The reactor 2 adopts an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, and adopts a wet sludge pump with the sludge concentration of 150000mg/L to be pumped into a reaction kettle. Adding CaO solution with the concentration of 20 percent, and controlling the PH value in the reactor to be 8. According to the volume and mass of the sludge, adding serine protease solution according to the mass ratio of 60mg/g, introducing hot steam and controlling the temperature in the reaction kettle at 50 ℃. The stirring blade was turned on and the reaction time was 3 hours. The power of the ultrasonic generator was set at 80kw and the time for the ultrasonic reaction was set at 25 min/time. The ultrasonic generator adopts an intermittent operation mode, and each operation is separated by 5 minutes. After the ultrasonic generator is started, the amplitude transformer is inserted into the position 10cm below the surface of the sludge liquid. The experimental detection device is an electrothermal blowing dryer and an ultraviolet-visible spectrophotometer UV-1600. Taking a proper amount of hydrolysate sample, centrifuging at 4000r/min for 15min, and measuring crude protein, soluble protein and soluble polysaccharide in the hydrolysate clear liquid; the hydrolysis residue was assayed for crude protein and EPS (protein and polysaccharide) content. The crude protein is measured by a Kai-type nitrogen determination method; the concentration of soluble protein is measured by adopting a Coomassie brilliant blue G-250 method; the concentration of the soluble polysaccharide is measured by a phenol-sulfuric acid method; the EPS content in the hydrolysis residue is extracted by a heat treatment method, and then the protein and the polysaccharide are measured.
The reaction results of the existing reactor 1 (labeled: low temperature thermal alkaline hydrolysis in the figure) and the reactor 2 of the present application (labeled: coupling reaction in the figure) are compared as follows:
after the experiment of the existing reactor 1, the concentration of crude protein in the hydrolysate is 6000mg/L; after the experiment, the concentration of crude protein in the hydrolysate of the reactor 2 is 11000mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
As shown in FIG. 3, after the experiment of the prior reactor 1, the concentration of soluble protein in the hydrolysate is 1500mg/L; after the experiment, the concentration of the soluble protein in the hydrolysate of the reactor 2 is 3000mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
As shown in FIG. 4, after the experiment of the prior reactor 1, the concentration of the soluble polysaccharide in the hydrolysate is 800mg/L; after the experiment, the concentration of the soluble polysaccharide in the hydrolysate of the reactor 2 is 1500mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
As shown in FIG. 5, after the experiment, the crude protein content in the hydrolysis residue of the existing reactor 1 is 120mg/g; after the experiment, the crude protein content in the hydrolysis residue of the reactor 2 is 80mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
As shown in FIG. 6, after the experiment, the protein content in the hydrolysis residue of the prior reactor 1 is 2mg/g; after the experiment, the crude protein content in the hydrolysis residue of the reactor 2 is 1mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
As shown in FIG. 7, after the experiment, the polysaccharide content in the hydrolysis residue of the existing reactor 1 is 2.5mg/g; after the experiment, the content of polysaccharide in hydrolysis residues of the reactor 2 is 1mg/L. The experimental results prove that the reactor 2 has better sludge hydrolysis capability and better cell wall breaking capability in the sludge hydrolysis process compared with the existing reactor 1.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (4)
1. A method for decomposing sludge by using an ultrasonic low-temperature thermokalite biochemical hydrolysis reactor, which comprises the following steps: the reaction kettle (27), the top cover (5), the motor (6), the stirring shaft (28), impeller blades (25), the feed pump (1), the medicine feeding pump (10), the steam generator (20), the discharge pump (17), the ultrasonic generator (9), the amplitude transformer (3), the PH meter (13), the thermometer (12), the liquid level meter (11) and the electric cabinet (14), the bottom of the reaction kettle (27) is in an inverted cone shape, the top cover (5) is arranged at the upper end of the reaction kettle (27), the stirring shaft (28) penetrates through the top cover (5) to extend into the reaction kettle (27), the upper end of the stirring shaft (28) is connected with the motor (6), the lower end of the stirring shaft (28) is connected with the impeller blades (25), the mud inlet (4) and the medicine inlet (7) are respectively arranged on the top cover (5), the feed pump (1) is connected with the mud inlet (4) through a first control valve (2), the medicine inlet (10) is connected with the medicine inlet (7) through a second control valve (8), the discharge outlet (15) is arranged at the bottom of the reaction kettle (27) and penetrates through a third control valve (16) to the top cover (15) to be inserted into the reaction kettle (27), the amplitude transformer (3) is connected with the ultrasonic generator (9), the steam inlet (24) is formed in the side wall close to the bottom of the reaction kettle (27), the steam generator (20) is connected with the steam inlet (24) through a sixth control valve (23), the steam generator (23) is also provided with a water inlet (22), the water inlet pipe is connected with the water inlet (22) through a fifth control valve (21), the PH meter (13), the thermometer (12) and the liquid level meter (11) are respectively arranged on the side wall of the reaction kettle (27), and are respectively connected with the electric cabinet (14), and the electric cabinet (14) is also respectively connected with the ultrasonic generator (9), the steam generator (20), the feed pump (1), the medicine feed pump (10) and the discharge pump (17);
the method is characterized in that: the method for decomposing sludge by using the ultrasonic low-temperature thermokalite biochemical hydrolysis reactor comprises the following steps:
(one), feeding
The wet sludge with the sludge concentration of 10000mg/L-15000mg/L enters the reaction kettle (27) from the feeding pump (1), and when the sludge reaches the position of 2/3 of the volume of the reaction kettle (27), the feeding is stopped;
(II) heating
Starting a steam generator (20), introducing hot steam into a reaction kettle (27) for heating, keeping the temperature in the reaction kettle (27) at 45-55 ℃, starting a motor (6), and driving an impeller (25) to stir at a rotating speed of 300-400 rpm by the motor (6);
(III) charging
Adding CaO solution with the concentration of 20% into a reaction kettle (27) from a feed pump (10), monitoring the value of a PH meter (13), stopping adding CaO solution when the PH detected by the PH meter (13) reaches 8-9, adding serine protease solution from the feed pump (10), adding serine protease solution according to the volume and mass of sludge according to the mass ratio of 60mg/g, simultaneously starting an ultrasonic generator (9) with the concentration of 80kw to keep the sound energy density in the reaction kettle (27) at 3-4w/ml, setting the running time of the ultrasonic generator (9) to 25 min/time, intermittently running for 5min at intervals between running times, and inserting an amplitude transformer (3) to 10cm below the surface of the sludge liquid after the ultrasonic generator (20) is started;
(IV) discharging
According to the steps, after the reaction is carried out for 2.5-3 hours, the motor (6), the steam generator (20) and the ultrasonic generator (9) are stopped, then the fourth control valve (18) is opened, the third control valve (16) and the discharge pump (17) are opened, and the sludge is discharged.
2. The method for decomposing sludge using an ultrasonic low temperature thermokalite biochemical hydrolysis reactor as claimed in claim 1, wherein: a sampling port (19) is arranged on the back taper part of the reaction kettle (27) close to the discharge port (15), and the sampling port (19) is connected with a fourth control valve (18).
3. The method for decomposing sludge using an ultrasonic low temperature thermokalite biochemical hydrolysis reactor as claimed in claim 2, wherein: the outside of the reaction kettle (27) is also coated with a sound insulation layer (26).
4. A method for decomposing sludge using an ultrasonic low temperature thermokalite biochemical hydrolysis reactor as claimed in claim 3, wherein: the reaction vessel (27) is made of stainless steel.
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