CN113636733B - Ozone promotes sludge digestion device - Google Patents
Ozone promotes sludge digestion device Download PDFInfo
- Publication number
- CN113636733B CN113636733B CN202110966737.9A CN202110966737A CN113636733B CN 113636733 B CN113636733 B CN 113636733B CN 202110966737 A CN202110966737 A CN 202110966737A CN 113636733 B CN113636733 B CN 113636733B
- Authority
- CN
- China
- Prior art keywords
- layer
- reaction tank
- ozone
- sludge
- biological reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
Abstract
The invention discloses a device for promoting sludge digestion by ozone, which comprises: a pretreatment tank, a biological reaction tank and a chemical reaction tank; wherein, the ozone pretreatment is carried out on the excess sludge in the pretreatment tank, and the ozone oxidation treatment efficiency is improved by utilizing a heating device, a first throat section, a second throat section, a stirring and cutting mechanism and the like; anaerobic digestion is carried out in a biological reaction tank for a long time, and the anaerobic digestion efficiency and the yield of sludge microorganisms are effectively improved by utilizing an iron cage structure, activated carbon, an antibiotic solution and the like; in the chemical reaction tank, an iron screen electrode is utilized for electrolysis, a plurality of layers of packing layers are arranged between the electrodes, and then a new reaction area is constructed on the surface of the lower layer of the biochar layer to deeply degrade organic matters. The device can effectively improve the anaerobic digestion efficiency and ozone utilization rate of the sludge, shorten the sludge digestion treatment time, and ensure that the treated sludge reaches the discharge standard, thereby realizing the economic and effective treatment of the sludge.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a device for promoting sludge digestion by ozone.
Background
The excess sludge is a byproduct in the urban domestic sewage treatment process, mainly comprises organic matters, bacteria, inorganic particles, colloid and the like, and has high water content (more than 95 percent). The excess sludge has high yield and contains a large amount of harmful substances, and the generation of a large amount of excess sludge is an important problem faced by an activated sludge process. The excess sludge, if not effectively treated, will cause secondary pollution, directly or indirectly threaten environmental safety and public health, and at the same time, greatly reduce the environmental benefits of sewage treatment facilities, and therefore, the excess sludge must be properly treated or disposed.
Anaerobic digestion is a common way to treat excess sludge. The Anaerobic Digestion (AD) of sludge refers to the decomposition of biodegradable organic matters in sludge into CH by facultative bacteria and Anaerobic bacteria under Anaerobic condition 4 、CO 2 、H 2 O and HS 2 The digestion technique of (1). The anaerobic digestion phenomenon widely exists in nature, and in places with insufficient oxygen conditions or high organic matter content and containing hydrated organic matter, the anaerobic digestion process of the organic matter occurs, and the process can generally remove 30-50% of the organic matter and stabilize the organic matter. Anaerobic digestion is a widely used and stable sludge treatment technique in large-scale sewage treatment plants, and has advantages in that while a significant reduction in sludge is achieved, sludge odor and pathogenic microorganisms in sludge can be removed, and methane gas (CH) rich in calorific value is generated 4 ) Realizes the resource utilization of the sludge to a certain extent.
The anaerobic digestion process mainly comprises 4 stages of hydrolysis, acidification, acetogenesis and methanogenesis, wherein in the hydrolysis process, most of nutrient substances required by anaerobic microorganisms exist in sludge flocs and protoplasm inside cell membranes (walls) of the microorganisms, and extracellular secretase cannot fully and effectively contact with the nutrient medium, so that the hydrolysis efficiency of complex organic matters in the sludge is very low, and the anaerobic digestion rate is severely limited. Therefore, the traditional anaerobic digestion technology is not high in digestion efficiency, the digestion process is long, and the problems that the sludge discharge does not reach the standard after digestion and the like are still encountered.
Disclosure of Invention
In view of the above, the present invention provides an ozone-assisted sludge digestion device, which can effectively improve anaerobic digestion efficiency and ozone utilization rate of sludge, shorten sludge digestion treatment time, and achieve discharge standard of treated sludge, thereby realizing economic and effective treatment of sludge.
An ozone-assisted sludge digestion unit comprising: the pretreatment tank, the biological reaction tank and the chemical reaction tank are respectively provided with a heat-preservation outer layer, wherein,
the top of the pretreatment tank is connected with a horizontal feeding pipe, a branch pipe is arranged on the horizontal feeding pipe and comprises a downward vertical part and a horizontal part, the vertical part of the branch pipe comprises a first vertical section and a first throat section, the horizontal part of the branch pipe is set as a second throat section, and the outlet end of the first throat section is connected with the inlet end of the second throat section; the diameter of the first vertical section is 1/4-1/2 of that of the horizontal feeding pipe, a heating device is arranged on the outer wall of the first vertical section, an ozone generator is connected to the throat of the first throat section, a liquid suction pipe is connected to the throat of the second throat section, and the bottom end of the liquid suction pipe is immersed in an anionic surfactant solution in a storage tank below the liquid suction pipe; the outlet end of the second throat pipe section is connected to the lower part of the pretreatment tank, the bottom of the pretreatment tank is provided with a stirring and cutting mechanism, and the bottom of the pretreatment tank is communicated with the bottom of the biological reaction tank;
the bottom of the biological reaction tank is provided with a sieve plate, and the sieve plate is flush with the bottom surface of the pretreatment tank; a conical groove is arranged below the sieve plate, and a sludge discharge outlet is formed in the conical bottom of the conical groove; an iron cage is arranged in the biological reaction tank, the iron cage is in an inverted heart shape, a gap between the outer edge of the iron cage and the inner side wall of the biological reaction tank is 12-20 cm, and activated carbon is filled in the iron cage; the top of the biological reaction tank is provided with an upper cover, one side of the upper cover is provided with a medicine storage device filled with antibiotic solution, the medicine storage device is connected with a liquid distribution pipe, the liquid distribution pipe extends into the iron cage, the tail end of the liquid distribution pipe is arranged in the activated carbon, and the tail end of the liquid distribution pipe is provided with a plurality of small holes; the top of the biological reaction tank is also provided with an exhaust port, and the exhaust port is provided with an exhaust valve; the upper part of the biological reaction tank is communicated with the upper part of the chemical reaction tank through a first communication pipe, and an inclined screen is arranged at a port close to the biological reaction tank in the first communication pipe; a temperature controller is arranged in the biological reaction tank and close to the first communication pipe, and the temperature controller is linked with the heating device;
a screen electrode is horizontally arranged in the chemical reaction tank, the screen electrode comprises an upper cathode and a lower double-layer anode, the anode and the cathode are made of iron materials and are respectively externally connected with the anode and the cathode of a direct current power supply; the double-layer anode consists of a first layer of anode and a second layer of anode, a plurality of vertical iron rods are arranged between the first layer of anode and the second layer of anode at intervals, and the upper end and the lower end of each vertical iron rod are respectively connected with the first layer of anode and the second layer of anode; a packing layer is also arranged between the first layer of anode and the second layer of anode, the packing layer comprises an upper layer, a middle layer and a lower layer, the upper layer packing layer is filled with a mixture of titanium boride particles, bismuth oxide particles and granular activated carbon, the middle layer packing layer is filled with a mixture of titanium boride particles, cerium oxide particles and granular activated carbon, and the lower layer is a biochar layer; and an outlet is arranged at the lower part of the chemical reaction tank.
In a specific example of the present invention, the diameter of the pretreatment tank is 1/7 to 1/5 of the diameter of the biological reaction tank, and the diameter of the chemical reaction tank is 1/3 to 1/2 of the diameter of the biological reaction tank.
In one embodiment of the invention, the antibiotic solution is norfloxacin solution at a concentration of 110mg/L.
In one embodiment of the present invention, the anionic surfactant is sodium lauryl sulfate.
In a specific example of the present invention, the charcoal layer is made of straw.
In an embodiment of the invention, the heating device is a heating coil wound on an outer wall of the first vertical section.
In an embodiment of the present invention, the screen plate is made of stainless steel.
In one embodiment of the present invention, the sieve plate has a sieve opening size of 1 to 3cm.
In one embodiment of the invention, the size of the pores of the iron cage is 0.2-0.5 cm.
In one embodiment of the invention, the iron cage is fixed on the screen plate by iron columns.
In a specific example of the invention, an upward iron column is fixed at the center of the sieve plate, and an iron cage is fixed at the top end of the iron column.
In an embodiment of the invention, the liquid dispensing tube is connected through an opening provided at a lower portion of the drug reservoir.
In a specific example of the invention, a ventilation opening is formed in the top of the medicine storage device, the ventilation opening is connected with a rubber tube, a screw clamp is arranged on the rubber tube, and the outflow speed of the medicine in the medicine storage device is controlled by adjusting the tightness of the screw clamp.
In one embodiment of the invention, the temperature controller is used for keeping the temperature of the residual sludge in the device at 50-55 ℃ all the time.
In one embodiment of the present invention, the stirring and cutting mechanism is a stirring blade, preferably a high-speed stirring blade.
In one embodiment of the present invention, the inclined screen has a mesh size of 0.5 to 1cm.
The device comprises a pretreatment tank, a biological reaction tank and a chemical reaction tank, wherein ozone pretreatment is carried out on the residual sludge in the pretreatment tank, and micronization, stabilization and uniform dispersion of ozone bubbles in high-temperature sludge are realized through the arrangement of branch pipes (comprising a heating device of a first vertical section, a first throat pipe section, a second throat pipe section and the like) and a stirring cutting mechanism and the like, so that the ozone oxidation treatment efficiency is improved, the cell walls of microorganisms can be better destroyed, the cell walls are inactivated to release intracellular substances, and macromolecular substances are decomposed into micromolecular substances, which is favorable for subsequent degradation treatment; long-time anaerobic digestion occurs in the biological reaction tank, and a large amount of simple substance iron in the iron cage structure can promote formic acid, acetic acid and H in the acid production process 2 The generation of the organic matter is improved, and the degradation reaction speed of the organic matter is improved; the iron cage and the liquid distributor with the specific structure realize the full contact of the antibiotic solution and the active carbon filler, so that the efficiency and the yield of methane production through anaerobic digestion of a large number of microorganisms in the sludge attached to the surface of the active carbon are effectively improved; moreover, under the promotion action of ozone pretreatment and high-temperature sludge, the anaerobic digestion rate and efficiency of the sludge in the biological reaction tank are obviously improved; in the chemical reaction tank, the electrolysis is performed by using an iron screen electrode, and a new degradation reaction area is constructed by a multilayer packing layer arranged between the electrodes: using the rich surface of the lower biochar layerThe functional group is combined with the organic matter, so that the organic matter in the sludge is attached to the surface of the biochar layer; meanwhile, titanium boride is added into the upper-layer composite packing layer and the middle-layer composite packing layer to promote electrons to be transferred from the electrodes to the surface of the metal oxide packing, so that the bismuth oxide and the cerium oxide which are the metal oxide packing combine electrons and react with ferrous ions to form more free radicals and unstable ions, such as active substances Bi (III), ce (III) and the like, under the action of ozone, and the active substances are intercepted on the surface of the lower-layer biochar layer, so that the active substances and organic matters are subjected to further degradation reaction on the surface of the biochar layer, and the deep degradation of sludge organic matters is realized.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the device comprehensively utilizes the advantages of biological treatment and chemical treatment of the sludge, fully utilizes the promotion effects of ozone and pyrohydrolysis, and improves the anaerobic treatment degree of the sludge in a multi-level manner; meanwhile, the device of the invention transforms the electrode structure in the chemical reaction tank, so that the filler in the electrode participates in the electrode reaction, and different from the conventional multidimensional electrode, the invention utilizes the reduction of ferrous ions generated by the anode on the surface of the filler to form unstable metal active ions, thereby continuously degrading organic matters, realizing the deep treatment of the residual sludge, and the discharge after the treatment meets the standard.
2. The device overcomes the defect of low utilization rate caused by limited contact of ozone and sludge in conventional ozone digestion promotion by the associated arrangement of a plurality of detailed structures.
3. The device of the invention makes the surface of the activated carbon and the surface of the biochar layer become important anaerobic digestion biological reaction micro-place and oxidative degradation reaction micro-place respectively by skillfully designing the internal structures of the biological reaction tank and the chemical reaction tank, and simultaneously, the residual sludge of the device is kept at 50-55 ℃, the reaction speed and efficiency are obviously improved, thereby greatly shortening the sludge digestion treatment time.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the ozone-assisted sludge digestion apparatus of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings and examples to more clearly understand the technical contents of the present invention.
In one embodiment of the present invention, as shown in fig. 1, an ozone-enhanced sludge digestion apparatus includes: a pretreatment tank 1, a biological reaction tank 2 and a chemical reaction tank 3.
The pretreatment tank 1 is vertically arranged, and the outer layer of the pretreatment tank 1 is a heat-insulating layer.
The top of the pretreatment tank 1 is connected with a horizontal feeding pipe 1-1, a branch pipe 1-2 is arranged on the horizontal feeding pipe 1-1, and the branch pipe 1-2 is similar to an L shape and comprises a downward vertical part and a horizontal part. The vertical part comprises a first vertical section 121 and a first throat section 122, the horizontal part is set to be a second throat section 123, the inlet end of the vertical part (the inlet end of the first vertical section 121) is connected with a horizontal feeding pipe 1-1, the outlet end of the vertical part (the outlet end of the first throat section 122) is connected with the inlet end of the horizontal part (the inlet end of the second throat section 123), and the outlet end of the horizontal part (the outlet end of the second throat section 123) is connected with the pretreatment tank 1.
The diameter of the first vertical section 121 is 1/4-1/2 of the diameter of the feeding pipe 1-1, a heating coil 7 is wound on the outer wall of the first vertical section 121, an ozone generator 4 is connected at the throat of the first throat section 122, a pipette 124 is connected at the throat of the second throat section 123, and the bottom end of the pipette 124 is immersed in the sodium dodecyl sulfate solution in the storage tank 5; the outlet end of the first throat section 122 is connected with the inlet end of the second throat section 123, and the outlet end of the second throat section 123 is connected with the lower part of the pretreatment tank 1.
The bottom of the pretreatment tank 1 is provided with a high-speed stirring tool bit 6, and the bottom of the pretreatment tank 1 is communicated with the bottom of the biological reaction tank 2.
The biological reaction tank 2 is vertically arranged, and the outer layer of the biological reaction tank 2 is a heat-insulating layer.
The bottom of the biological reaction tank 2 is provided with a sieve plate 12, and the sieve plate 12 is flush with the bottom surface of the pretreatment tank 1.
A cone groove 10 is arranged below the sieve plate 12, a sludge discharge outlet 11 is arranged at the bottom of the cone groove 10, and the sludge discharge outlet 11 is only opened during sludge discharge.
An upward iron column 13 is fixed at the center of the sieve plate 12, an iron cage 14 is fixed at the top end of the iron column 13, the iron cage 14 is in an inverted heart shape, the gap between the outer edge of the iron cage 14 and the inner side wall of the biological reaction tank 2 is 12-20 cm, and activated carbon 15 is filled in the iron cage 14.
2 tops of biological reaction jar are equipped with upper cover 16, one side at upper cover 16 is equipped with medicine storage device 17, the antibiotic solution (norfloxacin solution) is stored in medicine storage device 17, concentration is 110mg/L, medicine storage device 17's top is equipped with ventilative mouthful, be connected with rubber tube 19, be equipped with screw clamp 20 on the rubber tube 19, elasticity through adjusting screw clamp 20, the speed of medicine outflow in steerable medicine storage device 17, medicine storage device 17's lower part is equipped with the opening, be connected with liquid distribution pipe 18, liquid distribution pipe 18 extends into iron cage 14 inside and the terminal setting of liquid distribution pipe 18 among active carbon 15, 18 terminal a plurality of apertures of having arranged of liquid distribution pipe.
An exhaust port 21 is provided at the top of the biological reaction tank 2 (in fig. 1, the exhaust port 21 is located at the center of the upper lid 16), and an exhaust valve 22 is provided at the exhaust port 21.
The upper part (near the top end) of the biological reaction tank 2 is communicated with the upper part (near the top end) of the chemical reaction tank 3 through a first communication pipe, and an inclined screen 24 is arranged at a port close to the biological reaction tank 2 in the first communication pipe to prevent coarser particles from entering the chemical reaction tank 3 through the inclined screen 24.
A temperature controller 23 is arranged in the biological reaction tank 2 at a position close to the first communicating pipe, the temperature controller 23 is linked with the heating coil 7, and when the temperature is lower than the set temperature (50-55 ℃), the heating coil 7 starts to heat, so that the sludge in the device is always kept at the set temperature (50-55 ℃).
The chemical reaction tank 3 is vertically arranged, and the outer layer of the chemical reaction tank 3 is a heat-insulating layer.
A screen electrode is horizontally disposed in the chemical reaction tank 3, and the screen electrode includes an upper cathode 251 and a lower double-layer anode, and the double-layer anode is composed of a first-layer anode 252 and a second-layer anode 253. The anode and the cathode are made of iron materials and are respectively connected with the anode and the cathode of a direct current power supply externally.
A plurality of vertical iron rods 254 are arranged between the first-layer anode 252 and the second-layer anode 253 at intervals, and the upper end and the lower end of each vertical iron rod 254 are respectively connected with the first-layer anode 252 and the second-layer anode 253.
A packing layer 26 is further disposed between the first layer anode 252 and the second layer anode 253, the packing layer 26 is divided into an upper layer, a middle layer and a lower layer, the upper layer packing layer 261 is filled with a mixture of titanium boride particles, bismuth oxide particles and granular activated carbon, the middle layer packing layer 262 is filled with a mixture of titanium boride particles, cerium oxide particles and granular activated carbon, and the lower layer packing layer 263 is a biochar layer (commercially available product) made of straw.
The chemical reaction tank 3 is provided at a lower portion thereof with an outlet 27, and the treated liquid is discharged through the outlet 27.
The skilled person will appreciate that for better reaction results, the relative sizes of the three reaction tanks may be set: the diameter of the pretreatment tank 1 is 1/7-1/5 of the diameter of the biological reaction tank 2, and the diameter of the chemical reaction tank 3 is 1/3-1/2 of the diameter of the biological reaction tank 2. The volume of the biological reaction tank 2 is set to be larger, so that the high-temperature residual sludge can stay in the biological reaction tank for a longer time, and long-time anaerobic digestion can be realized.
It will be appreciated by those skilled in the art that the solution stored in the reservoir 5 may be other common anionic surfactant solutions in addition to the sodium lauryl sulfate solution described above.
The skilled person in the present invention can understand that the biochar layer used in the lower filler layer 263 can be the above-mentioned biochar layer made of straw, or can be a commercially available biochar layer made of other crops.
Those skilled in the art will appreciate that the screen 12 may be constructed of stainless steel.
It will be appreciated by those skilled in the art that the screen 12 has a mesh size of 1 to 3cm.
It will be appreciated by those skilled in the art that the size of the pores in the iron cage 14 will be in the range of 0.2 to 0.5cm.
It will be appreciated by those skilled in the art that the iron cage 14 may be fixed to the bioreactor tank 2 by means of iron posts as described above, or by means of suspension or other means.
It will be appreciated by those skilled in the art that the flow rate of the drug from the reservoir 17 may be controlled by a screw clamp as described above, or may be achieved by other means, such as a flow meter, a flow valve, etc.
It will be appreciated by those skilled in the art that the high speed blending bit 6 may be replaced with other blending and cutting mechanisms. The heating coil 7 can also be replaced by other heating means.
It will be appreciated by those skilled in the art that the inclined screen 24 has a mesh size of 0.5 to 1cm.
The operation process of the ozone-promoted sludge digestion device is as follows:
during operation, pumping residual sludge into the pretreatment tank 1 through the horizontal feed pipe 1-1 by a pump, wherein part of the residual sludge enters the branch pipe 1-2, is heated by the heating coil 7 through the first vertical section 121, and then enters the first throat section 122, ozone generated by the ozone generator 4 enters from the throat of the ozone generator and is mixed with the heated high-temperature residual sludge to form residual sludge mixed with a large amount of ozone bubbles; the excess sludge enters the second throat section 123 where it mixes with the sodium dodecyl sulfate solution sucked in from the reservoir 5 by the pipette 124, the ozone bubbles having a surface with negative charges, so that ozone bubbles are more stably present in the excess sludge; the high-temperature excess sludge mixed with stable ozone bubbles enters the pretreatment tank 1 from the outlet of the second throat pipe section 123, and is rapidly mixed with the excess sludge entering the pretreatment tank 1 from the horizontal feeding pipe 1-1 under the stirring action generated by the high-speed rotation of the stirring tool bit 6, meanwhile, under the high-speed cutting action of the stirring tool bit 6, coarse particles in the mixed excess sludge are broken, cell walls of microorganisms are broken, and ozone bubbles become smaller, so the wall-broken microorganisms in the excess sludge are fully contacted with the ozone bubbles under the stirring and cutting actions of the stirring tool bit 6, the utilization rate of ozone is greatly improved, and the oxidation efficiency of ozone for effectively oxidizing organic matters and microorganisms in the excess sludge is obviously improved.
After the pretreated residual sludge enters the biological reaction tank 2 through the bottom communicating pipe, the screw clamp 20 on the rubber pipe 19 is opened, the antibiotic solution (norfloxacin solution, 110 mg/L) in the medicine storage device 17 slowly flows downwards from the top end, and is dispersed into the activated carbon filler in the iron cage 14 through a plurality of small holes at the tail end of the liquid distribution pipe 18.
Because the iron cage 14 is arranged into an inverted heart-shaped structure, the diffusion of an antibiotic solution in the iron cage 14 is facilitated, the antibiotic solution is fully contacted with the surface of the activated carbon 15, meanwhile, the pretreated residual sludge also enters the iron cage 14 and is attached to the surface of the activated carbon 15, and a large number of microorganisms exist in the pretreated residual sludge, so that the surface of the activated carbon 15 becomes a micro-reaction site for anaerobic digestion of a large number of microorganisms, the existence of the antibiotic solution in the micro-reaction site can promote the anaerobic digestion effect, and the methane production efficiency and yield are improved.
Meanwhile, methane generated by anaerobic digestion is discharged from the exhaust port 21 at the top, and a turbulent flow structure can be formed outside the iron cage 14 by combining the inverted heart-shaped structure of the iron cage 14, so that coarse particles in the sludge can slide down along the outer wall of the iron cage 14 more easily and fall down to be deposited in the bottom conical groove 10 to be discharged periodically.
In addition, due to the combined control of the temperature controller 23 and the heating device 7, the residual sludge in the biological reaction tank 2 is always kept at a set high temperature (50-55 ℃), so that the anaerobic digestion in the biological reaction tank 2 (including the outside and the inside of the iron cage 14) is carried out at 50-55 ℃, the anaerobic digestion rate can be effectively improved, and the anaerobic digestion time can be shortened. In addition, a large amount of simple substance iron exists in the iron columns 13 and the iron cages 14 in the biological reaction tank 2, and can promote formic acid, acetic acid and H in the acid production process of anaerobic digestion 2 Thereby increasing the rate of anaerobic digestion.
The excess sludge of biological reaction jar 2 gets into chemical reaction jar 3 through the first communicating pipe at top, owing to be equipped with slope screen cloth 24 in the first communicating pipe, can be with coarse grain interception in the excess sludge and stay in biological reaction jar 2 (can fall and deposit to bottom awl groove 10 at follow-up), and the excess sludge of thinner high water content gets into in the chemical reaction jar 3.
In the chemical reaction tank 3, the residual sludge is electrolyzed under the action of an iron screen electrode, and organic matters are degraded. Meanwhile, a new degradation reaction area is constructed by a filling layer arranged between the double-layer anode electrodes: the surface of the lower biochar layer 263 has rich functional groups and can be combined with organic matters, so that the organic matters in the sludge are attached to the surface of the biochar layer; meanwhile, the titanium boride in the upper packing layer 261 and the middle packing layer 262 can promote the transfer of electrons from the electrodes to the surface of the metal oxide packing, so that the bismuth oxide and the cerium oxide of the metal oxide packing combine electrons and react with ferrous ions to form more free radicals and unstable ions under the action of ozone, for example, active substances such as Bi (III), ce (III) and the like are also intercepted on the surface of the lower biochar layer, and thus, the active substances and organic matters perform further degradation reaction on the surface of the lower biochar layer 263. Different from the common multi-dimensional electrode effect, the filling layer particles also participate in the electrode reaction, and ferrous ions generated by the anode are utilized to perform the reduction action on the surfaces of the particles to form unstable metal ions so as to fully degrade organic matters.
The sludge in the secondary sedimentation tank is introduced into the device, and can stably run after being debugged in the early period of one month. The retention time can be controlled within 3 days, and the average organic load is 4.3 kgCOD/(m) 3 D), the VSS removal rate of the device averagely reaches 68.8 percent, the SS removal rate is 83 percent, the removal rate is higher than that obtained by a general sludge anaerobic digester with the retention time of 20 to 30 days, and the treated sludge reaches the discharge standard. Therefore, when the device is used for sludge digestion treatment, the digestion treatment time is greatly shortened, and the digestion treatment effect is obviously improved.
It will thus be seen that the objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments may be modified without departing from the principles. Some examples will be described below. Accordingly, this invention includes all modifications encompassed within the spirit and scope of the claims.
Finally, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments described herein may be combined as appropriate to form other embodiments, as will be apparent to those skilled in the art from consideration of the specification and practice of the present specification as a whole.
Claims (9)
1. An ozone-assisted sludge digestion device, comprising: the pretreatment tank, the biological reaction tank and the chemical reaction tank are respectively provided with a heat-preservation outer layer, wherein,
the top of the pretreatment tank is connected with a horizontal feeding pipe, a branch pipe is arranged on the horizontal feeding pipe and comprises a downward vertical part and a horizontal part, the vertical part of the branch pipe comprises a first vertical section and a first throat section, the horizontal part of the branch pipe is set as a second throat section, and the outlet end of the first throat section is connected with the inlet end of the second throat section; the diameter of the first vertical section is 1/4 to 1/2 of that of the horizontal feeding pipe, a heating device is arranged on the outer wall of the first vertical section, an ozone generator is connected to the throat of the first throat section, a liquid suction pipe is connected to the throat of the second throat section, and the bottom end of the liquid suction pipe is immersed in an anionic surfactant solution in a storage tank below the liquid suction pipe; the outlet end of the second throat pipe section is connected to the lower part of the pretreatment tank, the bottom of the pretreatment tank is provided with a stirring and cutting mechanism, and the bottom of the pretreatment tank is communicated with the bottom of the biological reaction tank;
the bottom of the biological reaction tank is provided with a sieve plate, and the sieve plate is flush with the bottom surface of the pretreatment tank; a conical groove is arranged below the sieve plate, and a sludge discharge outlet is formed in the conical bottom of the conical groove; an iron cage is arranged in the biological reaction tank, the iron cage is in an inverted heart shape, a gap between the outer edge of the iron cage and the inner side wall of the biological reaction tank is 12-20cm, and activated carbon is filled in the iron cage; the top of the biological reaction tank is provided with an upper cover, one side of the upper cover is provided with a medicine storage device filled with an antibiotic solution, the antibiotic solution is norfloxacin solution, the concentration of the norfloxacin solution is 110mg/L, the medicine storage device is connected with a liquid distribution pipe, the liquid distribution pipe extends into the iron cage, the tail end of the liquid distribution pipe is arranged in the activated carbon, and the tail end of the liquid distribution pipe is provided with a plurality of small holes; the top of the biological reaction tank is also provided with an exhaust port, and the exhaust port is provided with an exhaust valve; the upper part of the biological reaction tank is communicated with the upper part of the chemical reaction tank through a first communication pipe, and an inclined screen is arranged at a port close to the biological reaction tank in the first communication pipe; a temperature controller is arranged in the biological reaction tank and close to the first communication pipe, and the temperature controller is linked with the heating device;
a screen electrode is horizontally arranged in the chemical reaction tank, the screen electrode comprises an upper cathode and a lower double-layer anode, the double-layer anode and the cathode are made of iron materials and are respectively externally connected with a positive electrode and a negative electrode of a direct current power supply; the double-layer anode consists of a first-layer anode and a second-layer anode, a plurality of vertical iron rods are arranged between the first-layer anode and the second-layer anode at intervals, and the upper end and the lower end of each vertical iron rod are respectively connected with the first-layer anode and the second-layer anode; a packing layer is also arranged between the first layer of anode and the second layer of anode, the packing layer comprises an upper layer, a middle layer and a lower layer, the upper layer packing layer is filled with a mixture of titanium boride particles, bismuth oxide particles and granular activated carbon, the middle layer packing layer is filled with a mixture of titanium boride particles, cerium oxide particles and granular activated carbon, and the lower layer is a biochar layer; and an outlet is arranged at the lower part of the chemical reaction tank.
2. The ozone-promoted sludge digestion device as claimed in claim 1, wherein the diameter of the pretreatment tank is 1/7 to 1/5 of the diameter of the biological reaction tank, and the diameter of the chemical reaction tank is 1/3 to 1/2 of the diameter of the biological reaction tank.
3. The ozone-assisted sludge digestion unit of claim 1, wherein the anionic surfactant is sodium lauryl sulfate.
4. The ozone-assisted sludge digestion unit according to claim 1, wherein said iron cage is fixed to said screen plate by iron posts.
5. The ozone-assisted sludge digestion unit of claim 1 wherein said screen is stainless steel.
6. The ozone-assisted sludge digestion unit according to claim 1, wherein the biochar layer is made of straw.
7. The ozone-assisted sludge digestion unit as claimed in claim 1, wherein the top of the drug storage device is provided with a vent, the vent is connected with a rubber tube, and the rubber tube is provided with a screw clamp.
8. The ozone-assisted sludge digestion unit of claim 1, wherein the agitation and cutting mechanism is an agitation blade.
9. The ozone-assisted sludge digestion unit of claim 1, wherein the temperature controller is configured to maintain the temperature of the excess sludge in the unit at 50 ℃ to 55 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966737.9A CN113636733B (en) | 2021-08-23 | 2021-08-23 | Ozone promotes sludge digestion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966737.9A CN113636733B (en) | 2021-08-23 | 2021-08-23 | Ozone promotes sludge digestion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113636733A CN113636733A (en) | 2021-11-12 |
| CN113636733B true CN113636733B (en) | 2022-11-15 |
Family
ID=78423443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110966737.9A Active CN113636733B (en) | 2021-08-23 | 2021-08-23 | Ozone promotes sludge digestion device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113636733B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124209B (en) * | 2022-07-28 | 2023-09-15 | 同济大学 | Method for promoting sludge to produce methane by using antiviral drugs |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004275882A (en) * | 2003-03-14 | 2004-10-07 | Yoshiyuki Sawada | Treatment apparatus for organic sludge |
| CN101708937A (en) * | 2009-11-27 | 2010-05-19 | 南京工业大学 | Method for promoting sludge to be reduced by ozone |
| CN109279746A (en) * | 2018-11-27 | 2019-01-29 | 东华大学 | A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down |
| CN110550736A (en) * | 2019-10-17 | 2019-12-10 | 中国科学院城市环境研究所 | Method for pretreating high-concentration fluoroquinolone antibiotic wastewater by using iron-carbon microelectrolysis coupling anaerobic acid production fermentation process |
| CN211226732U (en) * | 2019-11-21 | 2020-08-11 | 金风环保有限公司 | Ozone catalytic oxidation sewage treatment equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016037149A1 (en) * | 2014-09-04 | 2016-03-10 | Clean Chemistry, Inc. | Method of water treatment utilizing a peracetate oxidant solution |
-
2021
- 2021-08-23 CN CN202110966737.9A patent/CN113636733B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004275882A (en) * | 2003-03-14 | 2004-10-07 | Yoshiyuki Sawada | Treatment apparatus for organic sludge |
| CN101708937A (en) * | 2009-11-27 | 2010-05-19 | 南京工业大学 | Method for promoting sludge to be reduced by ozone |
| CN109279746A (en) * | 2018-11-27 | 2019-01-29 | 东华大学 | A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down |
| CN110550736A (en) * | 2019-10-17 | 2019-12-10 | 中国科学院城市环境研究所 | Method for pretreating high-concentration fluoroquinolone antibiotic wastewater by using iron-carbon microelectrolysis coupling anaerobic acid production fermentation process |
| CN211226732U (en) * | 2019-11-21 | 2020-08-11 | 金风环保有限公司 | Ozone catalytic oxidation sewage treatment equipment |
Non-Patent Citations (1)
| Title |
|---|
| How methane yield, crucial parameters and microbial communities respond to the stimulating effect of antibiotics during high solid anaerobic digestion;Suli Zhi et al.;《Bioresource Technology》;20190319;第283卷;第286-296页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113636733A (en) | 2021-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101724551B (en) | Full mixed anaerobic reaction circulating device and circulating method for methane reaction raw materials | |
| CN101157501B (en) | Helminth attaching biological bed for deweighting city sewage sludge | |
| CN105098217B (en) | Three-diemsnional electrode photoelectric microbiological fuel cell reactor and the method for biogas upgrading synergy | |
| CN202390287U (en) | Internal iron-carbon UASB-SBR (Upflow Anaerobic Sludge Blanket-Sequencing Batch Reactor) coupling system for treatment of printing and dyeing wastewater | |
| CN113636733B (en) | Ozone promotes sludge digestion device | |
| CN112794596A (en) | Sludge-water separation type sludge anaerobic digestion treatment system and method | |
| CN103803770A (en) | Organic sludge high-temperature microaerobic-anaerobic digestion device and method | |
| CN105541059B (en) | Pre-process the united excess sludge decomposition apparatus of EGSB microorganism electrochemicals and method | |
| CN106517440B (en) | A kind of multifunctional efficient generates device and the application of hydroxyl radical free radical | |
| CN202744421U (en) | Processing system for implementing up-to-standard discharge of wastewater generated from fermentation-type pharmacy | |
| CN114314835A (en) | Short-cut nitrification and denitrification coupling anaerobic ammonia oxidation denitrification reactor and integrated equipment | |
| CN212894039U (en) | Iron-carbon micro-electrolysis wastewater pretreatment device | |
| CN206736034U (en) | A kind of resource utilization system of livestock breeding wastewater | |
| CN210457638U (en) | Anaerobic tank for corn starch wastewater treatment | |
| CN218988922U (en) | Medical sewage treatment device | |
| CN202063797U (en) | High-concentration printing and dyeing wastewater treatment system | |
| CN207986982U (en) | A kind of precipitation part flow arrangement for livestock and poultry feces processing system | |
| CN208218632U (en) | A kind of material filling type change air pressure reinforcing excess sludge ozone minimizing device | |
| CN106082559A (en) | A kind of integrated waste-water treater of efficient energy-saving | |
| CN207361952U (en) | A kind of iron carbon catalyst oxidation reactor | |
| CN216639051U (en) | Short-range coupling anaerobic ammonia oxidation denitrification reactor and integrated equipment | |
| CN205710293U (en) | A kind of biological materialization total system of percolate | |
| CN215050185U (en) | Device for producing biogas through microbial anaerobic fermentation | |
| CN113845998A (en) | Anaerobic fermentation circulating device | |
| CN203065309U (en) | Biochemical enhancement treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |