CN112744994B - Device and method for hydrolysis acidification pretreatment of excess sludge - Google Patents
Device and method for hydrolysis acidification pretreatment of excess sludge Download PDFInfo
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Abstract
The invention relates to the technical field of sludge resource utilization, and discloses a device and a method for hydrolysis acidification pretreatment of excess sludge. The invention adopts a supergravity field integrated device for strengthening mass transfer efficiency, which is used for rotary mass transfer and reaction of solid-liquid contact, sludge passes through a filter screen, is mixed with ferrous-persulfate in a pipeline, passes through a hollow rotating shaft outlet hole, and is uniformly distributed in a reactor after colliding with a concave-convex attachment plate on the inner wall of a reactor shell under the centrifugal force action of a centrifugal impeller, and the centrifugal force and the concave-convex plate collide with each other and shear, so that the ferrous-persulfate oxidation action is coupled, the mechanical, hydraulic and chemical comprehensive action is formed, microbial cell wall breaking and cell lysis are realized, intracellular substances are dissolved out, and the carbon source release of residual sludge is realized. The invention can reduce the kinetic energy consumption of the reactor operation, can solve the problem of uneven mass transfer in the traditional reactor, has the characteristics of high efficiency, energy saving and low cost operation, and has engineering application prospect in the sludge hydrolysis acidification pretreatment.
Description
Technical Field
The invention belongs to the technical field of sludge resource utilization, and particularly relates to a device and a method for hydrolysis acidification pretreatment of excess sludge.
Background
The excess sludge is solid waste generated in sewage treatment, has large quantity and must be reasonably treated; the problem of insufficient carbon source commonly exists in domestic sewage plants, the TN of the effluent is generally up to the standard by adding an external carbon source, and additional operating cost is increased. In order to solve the two problems, researchers find that Volatile Fatty Acid (VFA) generated by excess sludge through hydrolytic acidification can be used as an external carbon source of an activated sludge system to improve the removal efficiency of system pollutants, the solid content of the excess sludge can be improved through sludge concentration, the VFA with high concentration can be obtained by the excess sludge in the hydrolytic acidification stage, supernatant is recycled in a sewage treatment process, the external carbon source adding amount can be reduced through denitrification of sewage with low C/N ratio, the sludge amount of the excess sludge is reduced after hydrolytic acidification, and further sludge reduction can be realized.
As most of organic matters in the sludge are cell substances of microorganisms, and are wrapped by cell walls (membranes) of the microorganisms, the organic matters are difficult to be utilized by anaerobic microorganisms, the hydrolytic acidification reaction of the sludge is limited, and the problems of long sludge retention time (20-30d), large fermentation tank volume and the like in the hydrolytic acidification process of the sludge are caused.
A commonly used method for solving the above problems is a pretreatment method, which includes: chemical pretreatment, mechanical physical methods, biological methods, different pretreatment combination treatment methods and the like. The mechanical pretreatment is to use the shearing force generated in the mechanical treatment process to destroy the cell wall (membrane) of the sludge thallus cells and release intracellular organic matters. The common mechanical sludge pretreatment methods mainly include a centrifugal crushing method, a high-pressure wall breaking method, a mechanical rotary grinding ball crushing method and the like. Some pretreated sludge by a centrifugal crushing method, and found that the gas yield of the sludge is improved by 85 percent compared with that of a group without mechanical pretreatment; the practical application effect in foreign countries shows that the centrifugal crushing pretreatment method of the sludge can improve the gas production rate of the sludge by more than 15 percent. The chemical pretreatment method utilizes free radicals (. OH or OH) generated by an oxidizing agent or system
) The sludge cells are subjected to wall breaking and cell lysis, and then intracellular substances such as fatty acid, protein, nucleic acid and other organic matters are released. The commonly used chemical and treatment methods are mainly ozone, hydrogen peroxide, ferrate, fenton's reagent, persulfate oxidation and the like. The literature reports that the lysis of the sludge can reach 30 percent after the excess sludge is treated by ferrate; the problems of overlarge kinetic energy consumption and uneven mass transfer exist in a physical crushing pretreatment reactor, so that the wall breaking efficiency and the cell dissolving efficiency of sludge are low.
Disclosure of Invention
The invention provides a device and a method for hydrolyzing and acidifying pretreatment of excess sludge to solve the defects of the prior art, and aims to solve the technical problems of high kinetic energy consumption and nonuniform mass transfer of the existing excess sludge pretreatment reactor, which cause lower sludge wall breaking and cell dissolving efficiency
The invention realizes the purpose through the following technical scheme:
the utility model provides a surplus sludge hydrolysis acidification preprocessing device, includes the reactor jar body, locates the mud discharging port of reactor jar body bottom for support the jar body skirt of the reactor jar body, medicine storage tank and hydrolysis acidification pond, the internal fore-and-aft cavity pivot that is equipped with of reactor jar, the bottom of cavity pivot is supported through the cavity supporting seat, be equipped with into mud mouth and play mud mouth in the cavity pivot, it is connected with medicine storage tank and outside mud storage pond to advance the mud mouth, it distributes on the pipe wall of cavity pivot to go out the mud mouth for the inner space of intercommunication cavity pivot and the reactor jar body, it has centrifugal impeller still to fixedly connected with in the cavity pivot, it establishes to go out the mud mouth centrifugal impeller with the position that centrifugal impeller corresponds, the mud discharging port of the reactor jar body is connected with hydrolysis acidification pond through mud discharge pipeline.
As a further optimization scheme of the invention, the inner side wall of the reactor tank body is provided with a concave-convex attachment plate.
As a further optimized scheme of the invention, the sludge inlet is connected with the medicine storage tank through a dosing metering pump, and is connected with an external sludge storage tank through a sludge metering pump and a filter screen which are sequentially connected, and the size of the filter screen is 2mm x 2 mm.
As a further optimized scheme of the invention, a flow baffle plate is also arranged on the hollow rotating shaft and is positioned in the inner space of the reactor tank body.
As a further optimization scheme of the invention, a tank cover is arranged on the reactor tank body, and the upper end of the hollow rotating shaft penetrates through the tank cover to extend to the outer space of the tank body and is connected with a driving mechanism arranged on the tank cover.
As a further optimized scheme of the invention, the driving mechanism comprises a cross beam and a frame arranged on the cross beam, the cross beam is arranged at the top of the tank body, a self-aligning bearing and an elastic coupling are arranged in the frame, a motor is arranged on the frame, the output end of the motor is connected with a speed reducer, one end of the elastic coupling is connected with a hollow rotating shaft penetrating through the self-aligning bearing, and the other end of the elastic coupling is connected with the output end of the speed reducer.
As a further optimized scheme of the invention, the sludge feeding metering pump is positioned on a pipeline between the sludge storage tank and the hollow supporting seat, and the hollow supporting seat is communicated with the hollow rotating shaft.
The invention also provides a method for pretreating excess sludge by hydrolysis and acidification, which needs to utilize the device to realize rotary mass transfer and reaction in solid-liquid contact, and comprises the following steps:
step one, mixing sludge passing through a filter screen of a sludge storage tank and ferrous-persulfate in a pipeline by adopting an intermittent sample introduction mode, introducing the obtained mixed sludge into a hollow rotating shaft from the bottom of a reactor tank body, driving the hollow rotating shaft to rotate by a driving mechanism, throwing out the mixed sludge by utilizing the centrifugal force action of a centrifugal impeller, and uniformly distributing the mixed sludge in the inner space of the reactor tank body after colliding with a concave-convex attachment plate on the inner side of the reactor tank body;
step two, settling the residual sludge without wall breaking under the action of gravity, and continuously breaking the wall in the inner space of the reactor tank body;
and step three, discharging the sludge subjected to wall breaking in the reactor tank body for a certain reaction time through a sludge discharge port, and feeding the sludge into a hydrolysis acidification tank at the rear section.
As a further optimized scheme of the invention, in the step one, Fe2+The addition amount is 40mg/g VSS, and the addition amount of the persulfate is 1:1 according to the mass ratio of the ferrous to the persulfate.
As a further optimization scheme of the invention, in the first step, the rotating speed of the hollow transmission shaft is 800-1000rpm, and in the third step, certain reaction time in the reactor tank body is 20-30 min.
The principle of the invention is as follows: and (3) adopting a pretreatment measure to realize wall breaking and cell lysis of microorganisms in the sludge so as to release intracellular substances, and hydrolyzing and acidifying the pretreated residual sludge to obtain a VFA product with higher concentration. Excess sludge pretreatment technique can break the sludge thallus cell wall (membrane), makes the cell material in the sludge thallus release fast, promotes the hydrolysis of macromolecular cell material to the micromolecular substance that easily is utilized by the bacterium among the sewage treatment system, improves the content of VFA in mud fermentation or the supernatant, and the efficiency is got rid of to the reinforcing pollutant, and is specific: the invention adopts a supergravity field sludge crushing and rotating reactor integrated device for strengthening the mass transfer efficiency, which is used for the rotating mass transfer and reaction of solid-liquid contact, a hollow transmission shaft is driven by a motor to rotate at high speed, the residual sludge passes through a filter screen and then is discharged from a sludge hole through the hollow transmission shaft, and is uniformly distributed in a reactor after colliding with a concave-convex attachment plate on the inner wall of a reactor shell under the centrifugal force action of a centrifugal impeller, and because of the collision shearing action of the centrifugal force and the concave-convex attachment plate, ferrous-persulfate oxidation is coupled to form the comprehensive action of machinery, hydraulic power and chemistry, microbial cell wall breaking and cell dissolving, intracellular substances are dissolved and hydrolyzed, and the carbon source release of the residual sludge is realized.
The invention has the beneficial effects that:
1) the invention can reduce the kinetic energy consumption of the reactor operation, can also solve the problem of uneven mass transfer in the traditional reactor, has the characteristics of high efficiency, energy saving and low cost operation, is easy to operate and strong in controllability, and has engineering application prospect in the sludge hydrolysis acidification pretreatment;
2) the hydrolyzed and acidified sludge can be used as a carbon source for a sewage treatment plant with a low C/N ratio for sewage denitrification, can realize waste resource utilization and sludge reduction, reduces the sewage and sludge treatment cost of an operation unit, and can reduce the environmental pollution load.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the construction of the centrifugal impeller according to the present invention;
FIG. 3 is a top plan view of the centrifugal impeller of the present invention;
FIG. 4 is a schematic diagram of a concave-convex attachment plate structure according to the present invention;
FIG. 5 is a plan view of the concavo-convex attachment plate of the present invention;
FIGS. 6, 7, 8 and 9 are schematic diagrams showing the effect of sludge solidification rate on the residual sludge lysis rate and the concentration of VFA in the sludge supernatant according to three treatment methods of the present invention;
in the figure: 1 reactor tank, 2 tank skirt bases, 3 tank covers, 4 beams, 5 frames, 6 speed reducers, 7 motors, 8 frequency converters, 9 concave-convex attachment plates, 10 elastic couplings, 11 self-aligning bearings, 12 spoilers, 13 centrifugal impellers, 14 hollow rotating shafts, 15 hollow supporting seats, 16 sludge discharge ports, 17 medicine storage tanks, 18 medicine adding metering pumps, 19 sludge inlet metering pumps, 20 filter screens, 21 sludge storage tanks, 22 sludge discharge pipelines and 23 hydrolysis acidification tanks.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
As shown in fig. 1-5, a residual sludge hydrolysis acidification pretreatment device comprises a reactor tank 1, a sludge discharge port 16 arranged at the bottom of the reactor tank 1, a tank skirt (2) for supporting the reactor tank 1, a drug storage tank 17 and a hydrolysis acidification tank 23, wherein a longitudinal hollow rotating shaft 14 is arranged in the reactor tank 1, the bottom end of the hollow rotating shaft 14 is supported by a hollow supporting seat 15, the hollow rotating shaft 14 is provided with a sludge inlet and a sludge outlet, the sludge inlet is connected with the drug storage tank 17 and an external sludge storage tank 21, the sludge outlet is distributed on the pipe wall of the hollow rotating shaft 14 and is used for communicating the hollow rotating shaft 14 with the internal space of the reactor tank 1, the hollow rotating shaft 14 is also fixedly connected with a centrifugal impeller 13, the sludge outlet is arranged at a position corresponding to the centrifugal impeller 13 and the centrifugal impeller 13, the sludge discharge port 16 of the reactor tank 1 is connected with the hydrolysis acidification tank 23 through a sludge discharge pipe 22, residual sludge is subjected to centrifugal force shearing action through a centrifugal impeller 13, the chemical oxidation action of ferrous-persulfate is coupled, and the sludge is continuously broken and lysed.
Specifically, the inside wall of the reactor tank body 1 is also provided with concave-convex attachment plates 9, when the hollow rotating shaft rotates at a high speed, the centrifugal impeller 13 sprays the concave-convex attachment plates 9 on the inner wall of the reactor shell under the action of centrifugal force, the coupling ferrous-persulfate chemical oxidation effect is realized, and the wall breaking and the cell dissolving of the sludge are continuously completed.
The mud inlet is connected with a medicine storage tank 17 through a medicine adding metering pump 18, and is connected with an external mud storage pool 21 through a mud feeding metering pump 19 and a filter screen 20 which are sequentially connected, wherein the mud feeding metering pump 19 is positioned on a pipeline between the mud storage pool 21 and the hollow supporting seat 15, the size of the filter screen 20 is 2mm x 2mm, and the mixture of residual sludge and ferrous-persulfate solution is pumped into the hollow rotating shaft 14.
The hollow rotating shaft 14 is also provided with a flow blocking plate 12, the flow blocking plate 12 is positioned in the inner space of the reactor tank 1, and the flow blocking plate 12 can prevent the residual sludge from entering the hollow rotating shaft 14 after being cracked.
A tank cover 3 is arranged on the reactor tank body 1, and the upper end of a hollow rotating shaft 14 penetrates through the tank cover 3 to extend to the outer space of the tank body 1 and is connected with a driving mechanism arranged on the tank cover 3; actuating mechanism includes crossbeam 4 and locates frame 5 on crossbeam 4, crossbeam 4 is established at the top of jar body 1, install self-aligning bearing 11 and elastic coupling 10 in the frame 5, install motor 7 on the frame 5, the output of motor 7 is connected with speed reducer 6, elastic coupling 10 one end is connected with the cavity pivot 14 that passes self-aligning bearing 11, the other end is connected with speed reducer 6 output, use through the cooperation of converter with speed reducer 6, reduce the kinetic energy consumption of reactor operation in-process, be equipped with self-aligning bearing 11 and elastic coupling 10 between the output shaft of speed reducer 6 and cavity pivot 14, it is rotatory together firmly to couple output shaft and the well idle pivot 14 of speed reducer 6, and transmission motion and moment of torsion.
The embodiment also provides a method for performing hydrolysis acidification pretreatment on excess sludge by using the device, the sludge in the sludge concentration tank is taken, the amount of ferrous iron and persulfate to be added is calculated, the solution is prepared and then is respectively pumped into a hollow rotating shaft of a supergravity reactor through a metering pump after being prepared into the solution, the rotating speed is adjusted, after certain time of treatment, the excess sludge subjected to wall breaking and cell dissolving is discharged from a sludge discharge port below the reactor and enters the hydrolysis acidification tank 23 at the rear section, and the method specifically comprises the following steps:
step one, mixing sludge passing through a filter screen of a sludge storage tank 21 and ferrous-persulfate in a pipeline by adopting an intermittent sample feeding mode, leading the obtained mixed sludge into a hollow rotating shaft 14 through a hollow supporting seat 15 at the bottom of the reactor, driving the hollow rotating shaft 14 to rotate at a high speed through a motor 7 of a driving mechanism, and colliding with a concave-convex attachment plate 9 of a reactor shell under the centrifugal force action of a centrifugal impeller 13 and then uniformly distributing in the reactor.
And step two, the residual sludge without wall breaking is settled under the action of gravity and enters the reactor to continue wall breaking.
And step three, discharging the sludge subjected to wall breaking in the reactor tank body 1 for a certain reaction time through a sludge discharge port 16 into a hydrolysis acidification tank 23 at the rear section.
Specifically, the method comprises the following steps:
in step one, Fe2+The addition amount of the persulfate is 40mg/g VSS, and the addition amount of the persulfate is 1:1 according to the mass ratio of ferrous to persulfate; the rotating speed of the hollow transmission shaft 5 is 800-;
in the third step, the reaction time in the reactor tank body 1 is 20-30 min.
Example 1
The solid content of the sludge is 3 percent, and the residual sludge is treated by adopting a hypergravity reactor, ferrous-persulfate and a method for coupling the ferrous-persulfate by the hypergravity reactor, wherein the rotating speed of the hypergravity reactor is 1000rpm, and Fe2+The addition amount of the persulfate is 40mg/g VSS, the addition amount of the persulfate is 1:1 according to the mass ratio of ferrous to persulfate, and the reaction time is the same20min, respectively determining the lysis rate (%) of the sludge and the VFA content (mg.L-1) of the supernatant after treatment, wherein the VFA content of the supernatant of the raw sludge is 11.2mg.L-1The results are shown in FIG. 6. The lysis rates of the treated excess sludge were 22.6%, 32.7% and 43.5%, respectively, and the VFA of the sludge supernatant was 80.3mg.L, respectively-1、175.3mg.L-1And 224.5mg.L-1. The excessive sludge is treated by coupling the super-gravity reactor with persulfate, the sludge cell lysis rate and the supernatant VFA are the highest, and the rates are respectively 19.9 percent, 10.8 percent and 144.2mg.L higher than those of a single super-gravity reactor and persulfate oxidation-1、48.8mg.L-1。
Example 2
The solid content of the sludge is 3 percent, and the residual sludge is treated by adopting a hypergravity reactor, ferrous-persulfate and a method for coupling the ferrous-persulfate by the hypergravity reactor, wherein the rotating speed of the hypergravity reactor is 1000rpm, and Fe2+The addition amount of 40mg/g VSS, the persulfate addition amount is 1:1 according to the mass ratio of ferrous to persulfate substances, the reaction time is 30min, and the lysis rate (%) of the sludge and the VFA content (mg.L) of the supernatant are respectively determined after treatment-1) VFA of the crude sludge supernatant was 11.2mg.L-1The results are shown in FIG. 7. The lysis rates of the treated excess sludge were 26.8%, 38.9% and 48.5%, respectively, and the VFA of the sludge supernatant was 100.2mg.L, respectively-1、240.6mg.L-1And 329.5mg.L-1. The excessive sludge is treated by coupling the super-gravity reactor with persulfate, the sludge cell lysis rate and the supernatant VFA are the highest, and the cell lysis rate and the supernatant VFA are respectively 21.7 percent, 9.6 percent and 229.3mg.L higher than those of a single super-gravity reactor and persulfate oxidation-1、88.9mg.L-1。
Example 3
The solid content of the sludge is 5 percent, and the excess sludge is treated by adopting a hypergravity reactor, ferrous-persulfate and the method for coupling the ferrous-persulfate by the hypergravity reactor, wherein the rotating speed of the hypergravity reactor is 1000rpm, and Fe2+The addition amount of 40mg/g VSS, the persulfate addition amount is 1:1 according to the mass ratio of ferrous to persulfate substances, the reaction time is 20min, and the lysis rate (%) of the sludge and the VFA content (mg.L) of the supernatant are respectively determined after treatment-1) VFA of the crude sludge supernatant was 11.2mg.L-1The results are shown in FIG. 8. The lysis rates of the treated excess sludge were 18.2%, 28.6% and 38.3%, respectively, and the VFA of the sludge supernatant was 75.6mg.L, respectively-1、165.3mg.L-1And 202.7mg.L-1. The excessive sludge is treated by coupling the super-gravity reactor with persulfate, the sludge cell lysis rate and the supernatant VFA are the highest, and the cell lysis rate and the supernatant VFA are respectively 16.6 percent, 6.7 percent and 127.1mg.L higher than those of a single super-gravity reactor and persulfate oxidation-1、37.4mg.L-1。
Example 4
The solid content of the sludge is 5 percent, and the excess sludge is treated by adopting a hypergravity reactor, ferrous-persulfate and the method for coupling the ferrous-persulfate by the hypergravity reactor, wherein the rotating speed of the hypergravity reactor is 1000rpm, and Fe2+The addition amount of 40mg/g VSS, the persulfate addition amount is 1:1 according to the mass ratio of ferrous to persulfate substances, the reaction time is 30min, and the lysis rate (%) of the sludge and the VFA content (mg.L) of the supernatant are respectively determined after treatment-1) VFA of the crude sludge supernatant was 11.2mg.L-1The results are shown in FIG. 9. The lysis rates of the treated excess sludge were 24.5%, 36.6% and 44.8%, respectively, and the VFA of the sludge supernatant was 95.6mg.L, respectively-1、220.4mg.L-1And 295.9mg.L-1. The excess sludge is treated by coupling the super-gravity reactor with persulfate, the sludge cell lysis rate and the supernatant VFA are the highest, and the cell lysis rate and the supernatant VFA are respectively 20.3 percent, 8.2 percent and 200.3mg.L higher than those of a single super-gravity reactor and persulfate oxidation-1、75.5mg.L-1。
As can be seen by comparing the above examples, the method of the present invention for coupling ferrous-persulfate to the hypergravity reactor has higher lysis rate and VFA content of the supernatant than the mechanical treatment or the chemical treatment of ferrous-persulfate using the hypergravity reactor alone; the method can be obtained by comparing the embodiment 1 with the embodiment 2, the sludge solid content is 3 percent, and the sludge lysis rate and the supernatant VFA obtained by treating the residual sludge by using a method of coupling a super-gravity reactor with ferrous-persulfate can be highest when the reaction time is different; by comparing the embodiment 3 with the embodiment 4, the sludge solid content is 5%, and the reaction time is different, the sludge lysis rate and the supernatant VFA obtained by treating the excess sludge by using the method of coupling the super-gravity reactor with the ferrous-persulfate can be highest; in conclusion, the method for treating the excess sludge by using the hypergravity reactor coupled with the ferrous-persulfate can obtain higher lysis rate and higher VFA content of supernatant when the reaction time and the sludge solid content are different.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. The residual sludge hydrolysis acidification pretreatment device comprises a reactor tank body (1), a sludge discharge port (16) arranged at the bottom of the reactor tank body (1), and a tank body skirt seat (2) used for supporting the reactor tank body (1), and is characterized by further comprising a medicine storage tank (17) and a hydrolysis acidification pool (23), wherein a longitudinal hollow rotating shaft (14) is arranged in the reactor tank body (1), the bottom end of the hollow rotating shaft (14) is supported by a hollow supporting seat (15), a sludge inlet and a sludge outlet are arranged on the hollow rotating shaft (14), the sludge inlet is connected with the medicine storage tank (17) and an external sludge storage pool (21), the medicine storage tank (17) is a ferrous-persulfate medicine storage tank, sludge passing through the sludge storage pool (21) is mixed with ferrous-persulfate in a pipeline, and the obtained mixed sludge is guided into the hollow rotating shaft (14) from the bottom of the reactor tank body (1), the mud outlet is distributed on the pipe wall of the hollow rotating shaft (14) and used for communicating the hollow rotating shaft (14) with the inner space of the reactor tank body (1), the hollow rotating shaft (14) is further fixedly connected with a centrifugal impeller (13), the inner side wall of the reactor tank body (1) is provided with a concave-convex attachment plate (9), the mud outlet is arranged on the hollow rotating shaft and corresponds to the centrifugal impeller (13), the centrifugal force action of the centrifugal impeller (13) is utilized to throw out mixed mud, and the mud outlet (16) of the reactor tank body (1) is connected with the hydrolysis acidification pool (23) through a mud discharge pipeline (22).
2. The residual sludge hydrolytic acidification pretreatment device according to claim 1, wherein the sludge inlet is connected with the drug storage tank (17) through a dosing metering pump (18), and is connected with an external sludge storage tank (21) through a sludge metering pump (19) and a filter screen (20) which are connected in sequence, and the size of the filter screen (20) is 2mm x 2 mm.
3. The residual sludge hydrolytic acidification pretreatment device according to claim 1, wherein a flow baffle plate (12) is further arranged on the hollow rotating shaft (14), and the flow baffle plate (12) is positioned in the inner space of the reactor tank (1).
4. The residual sludge hydrolytic acidification pretreatment device according to claim 1, wherein a tank cover (3) is arranged on the reactor tank body (1), and the upper end of the hollow rotating shaft (14) passes through the tank cover (3) to extend to the outer space of the tank body (1) and is connected with a driving mechanism arranged on the tank cover (3).
5. The residual sludge hydrolytic acidification pretreatment device according to claim 4, wherein the driving mechanism comprises a cross beam (4) and a frame (5) arranged on the cross beam (4), the cross beam (4) is arranged at the top of the tank body (1), a self-aligning bearing (11) and an elastic coupling (10) are arranged in the frame (5), a motor (7) is arranged on the frame (5), the output end of the motor (7) is connected with a speed reducer (6), one end of the elastic coupling (10) is connected with a hollow rotating shaft (14) passing through the self-aligning bearing (11), and the other end of the elastic coupling is connected with the output end of the speed reducer (6).
6. The excess sludge hydrolytic acidification pretreatment device according to claim 2, characterized in that: the mud feeding metering pump (19) is positioned on a pipeline between the mud storage pool (21) and the hollow supporting seat (15), and the hollow supporting seat (15) is communicated with the hollow rotating shaft (14).
7. A method for pre-treating excess sludge by hydrolytic acidification, which is characterized by being realized by the device of any one of claims 1 to 6, wherein the device is used for rotating mass transfer and reaction in solid-liquid phase contact, and the steps of the method for pre-treating excess sludge by hydrolytic acidification comprise:
mixing sludge passing through a sludge storage tank and a filter screen with ferrous-persulfate in a pipeline by adopting an intermittent sample feeding mode, leading the obtained mixed sludge into a hollow rotating shaft (14) from the bottom of a reactor tank body (1), driving the hollow rotating shaft (14) to rotate by a driving mechanism, throwing the mixed sludge out by utilizing the centrifugal force action of a centrifugal impeller (13), and uniformly distributing the mixed sludge into the inner space of the reactor tank body (1) after colliding with a concave-convex attachment plate (9) on the inner side of the reactor tank body (1);
step two, the residual sludge without wall breaking is settled under the action of gravity, and the wall breaking is continuously carried out in the inner space of the reactor tank body (1);
and step three, discharging the sludge subjected to wall breaking in the reactor tank body (1) for a certain reaction time through a sludge discharge port (16) and entering a hydrolysis acidification tank (23) at the rear section.
8. The method as claimed in claim 7, wherein in the first step, Fe is added2+The addition amount is 40mg/g VSS, and the addition amount of the persulfate is 1:1 according to the mass ratio of the ferrous to the persulfate.
9. The method as claimed in claim 7, wherein the rotation speed of the hollow rotating shaft (14) in the first step is 800-1000rpm, and the reaction time in the reactor tank (1) in the third step is 20-30 min.
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|---|---|---|---|---|
| JP2004351266A (en) * | 2003-05-27 | 2004-12-16 | Hitachi Kiden Kogyo Ltd | Sewage treatment system |
| CN206089414U (en) * | 2016-08-29 | 2017-04-12 | 重庆威臣环保工程有限公司 | Can realize mud broken wall jar of degree of depth dehydration |
| CN109354349A (en) * | 2018-03-30 | 2019-02-19 | 中国科学院生态环境研究中心 | Sludge pre-treatment method and sludge anaerobic fermentation and acid production method |
| CN211141847U (en) * | 2019-09-28 | 2020-07-31 | 江苏丰又环境科技有限公司 | Biochemical sludge reduction equipment |
| CN112010410A (en) * | 2020-07-21 | 2020-12-01 | 广东乌浦萨拉环保科技有限公司 | High-efficient sedimentation tank system |
-
2020
- 2020-12-31 CN CN202011638521.1A patent/CN112744994B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004351266A (en) * | 2003-05-27 | 2004-12-16 | Hitachi Kiden Kogyo Ltd | Sewage treatment system |
| CN206089414U (en) * | 2016-08-29 | 2017-04-12 | 重庆威臣环保工程有限公司 | Can realize mud broken wall jar of degree of depth dehydration |
| CN109354349A (en) * | 2018-03-30 | 2019-02-19 | 中国科学院生态环境研究中心 | Sludge pre-treatment method and sludge anaerobic fermentation and acid production method |
| CN211141847U (en) * | 2019-09-28 | 2020-07-31 | 江苏丰又环境科技有限公司 | Biochemical sludge reduction equipment |
| CN112010410A (en) * | 2020-07-21 | 2020-12-01 | 广东乌浦萨拉环保科技有限公司 | High-efficient sedimentation tank system |
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| CN112744994A (en) | 2021-05-04 |
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