CN113636733A - Ozone promotes sludge digestion device - Google Patents
Ozone promotes sludge digestion device Download PDFInfo
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- CN113636733A CN113636733A CN202110966737.9A CN202110966737A CN113636733A CN 113636733 A CN113636733 A CN 113636733A CN 202110966737 A CN202110966737 A CN 202110966737A CN 113636733 A CN113636733 A CN 113636733A
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- 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
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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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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 residual sludge is subjected to ozone pretreatment in a pretreatment tank, and the ozone oxidation treatment efficiency is improved by utilizing a heating device, a first throat pipe section, a second throat pipe 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 more common way of treating 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 condition4、CO2、H2O and HS2The digestion technique of (1). The anaerobic digestion phenomenon is widely existed in nature, and in places with insufficient oxygen condition or high organic matter content and containing hydrated organic matter, the anaerobic digestion process of the organic matter can occur, 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 generated4) 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 the diameter 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 an 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 an embodiment of the present invention, the diameter of the pretreatment tank is 1/7-1/5 of the diameter of the biological reaction tank, and the diameter of the chemical reaction tank is 1/3-1/2 of the diameter of the biological reaction tank.
In one embodiment of the invention, the antibiotic solution is norfloxacin solution with a concentration of 110 mg/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 a specific example of the present 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 1-3 cm.
In one embodiment of the present 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 sieve 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 one embodiment of the invention, the liquid dispensing tube is connected through an opening provided at a lower portion of the medicine 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 size of the screen hole of the inclined screen is 0.5-1 cm.
The device comprises a pretreatment tank, a biological reaction tank and a chemical reaction tank, wherein the residual sludge is subjected to ozone pretreatment in the pretreatment tank, and ozone bubbles are micronized and stabilized and uniformly dispersed in high-temperature sludge 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 and cutting mechanism and the like, so that the ozone oxidation treatment efficiency is improved, the cell walls of microorganisms can be better destroyed, intracellular substances are released by inactivation, and macromolecular substances are decomposed into micromolecular substances, thereby being beneficial to subsequent degradation treatment; long-term anaerobic digestion takes place in the bioreactor tank, existing in the iron cage structureA large amount of simple substance iron can promote formic acid, acetic acid and H in the acid production process2The 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, electrolysis is performed using iron screen electrodes, and a new degradation reaction area is constructed by a multi-layer packing layer provided between the electrodes: utilizing rich functional groups on the surface of the lower biochar layer to combine with organic matters, so that the organic matters in the sludge are 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 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 between ozone and sludge in conventional ozone digestion promotion by the associated arrangement of a plurality of detailed structures.
3. The device of the invention skillfully designs the internal structures of the biological reaction tank and the chemical reaction tank, so that the surface of the activated carbon and the surface of the biological carbon layer respectively become an important anaerobic digestion biological reaction micro-place and an important oxidative degradation reaction micro-place, and meanwhile, 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 as a second throat section 123, the inlet end of the vertical part (the inlet end of the first vertical section 121) is connected with the 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 to the throat of the first throat section 122, a liquid suction pipe 124 is connected to the throat of the second throat section 123, and the bottom end of the liquid suction pipe 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 in 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, a 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 arranged in the chemical reaction tank 3, and the screen electrode comprises 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 lower part of the chemical reaction tank 3 is provided with an outlet 27, and the treated liquid is discharged from 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.
The technical personnel of the invention can understand that the sieve pore size of the sieve plate 12 is 1-3 cm.
As can be understood by the skilled person, the size of the pores of the iron cage 14 is 0.2-0.5 cm.
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.
As can be understood by those skilled in the art, the size of the screen hole of the inclined screen 24 is 0.5-1 cm.
The operation process of the ozone-promoted sludge digestion device is as follows:
when in operation, the residual sludge is pumped into the pretreatment tank 1 by a pump through a horizontal feeding pipe 1-1, wherein a part of the residual sludge enters a branch pipe 1-2, is heated by a heating coil 7 through a first vertical section 121 and then enters a first throat section 122, ozone generated by an 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 that 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 remarkably 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, 110mg/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 for periodic discharge.
In addition, the temperature controller 23 and the heating device 7 are jointly controlled, so that the residual sludge in the biological reaction tank 2 is always kept at a set high temperature (50-55 ℃), and the residual sludge is further kept at the set high temperatureSo that 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 ℃, and 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 digestion2Thereby increasing the rate of anaerobic digestion.
The excess sludge of the biological reaction tank 2 enters the chemical reaction tank 3 through the first communication pipe at the top, and as the inclined screen 24 is arranged in the first communication pipe, coarse particles in the excess sludge can be intercepted and remained in the biological reaction tank 2 (can be subsequently deposited in the bottom cone groove 10 in a falling manner), and the thinner excess sludge with high water content enters the chemical reaction tank 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 filler layer 261 and the middle filler layer 262 can promote the transfer of electrons from the electrode to the surface of the metal oxide filler, so that the bismuth oxide and the cerium oxide of the metal oxide filler combine electrons and react with ferrous ions to form more free radicals and unstable ions under the action of ozone, such as active substances of Bi (III), Ce (III) and the like, and the active substances are also intercepted on the surface of the lower biochar layer, so that 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 particle surface 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)3D) the device achieves the VSS removal rate on average68.8 percent, the average removal rate of SS is 83 percent, which is higher than the removal rate obtained by a general sludge anaerobic digester with the retention time of 20-30 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 description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. 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 the diameter 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 an 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 a positive electrode and a negative electrode 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; the lower part of the chemical reaction tank is provided with an outlet.
2. The ozone-promoted sludge digestion unit as claimed in claim 1, wherein the diameter of the pretreatment tank is 1/7-1/5 of the diameter of the biological reaction tank, and the diameter of the chemical reaction tank is 1/3-1/2 of the diameter of the biological reaction tank.
3. The ozone-assisted sludge digestion unit of claim 1, wherein said antibiotic solution is norfloxacin solution at a concentration of 110 mg/L.
4. The ozone-assisted sludge digestion unit of claim 1, wherein the anionic surfactant is sodium lauryl sulfate.
5. The ozone-assisted sludge digestion unit according to claim 1, wherein said iron cage is fixed to said screen plate by iron posts.
6. The ozone-assisted sludge digestion unit of claim 1, wherein said screen is stainless steel.
7. The ozone-assisted sludge digestion unit according to claim 1, wherein the biochar layer is made of straw.
8. 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.
9. The ozone-assisted sludge digestion unit of claim 1, wherein the agitation and cutting mechanism is an agitation blade.
10. The ozone-assisted sludge digestion unit according to claim 1, wherein said temperature controller is configured to maintain the temperature of the excess sludge in the unit at 50-55 ℃.
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