CN110746069A - Sludge modification process - Google Patents
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- CN110746069A CN110746069A CN201910932650.2A CN201910932650A CN110746069A CN 110746069 A CN110746069 A CN 110746069A CN 201910932650 A CN201910932650 A CN 201910932650A CN 110746069 A CN110746069 A CN 110746069A
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- 239000010802 sludge Substances 0.000 title claims abstract description 203
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000004048 modification Effects 0.000 title claims abstract description 32
- 238000012986 modification Methods 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 title claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 238000006011 modification reaction Methods 0.000 claims abstract description 28
- 238000005189 flocculation Methods 0.000 claims abstract description 17
- 230000016615 flocculation Effects 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 15
- 239000010865 sewage Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 239000006228 supernatant Substances 0.000 claims abstract description 9
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 76
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 22
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000706 filtrate Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 4
- 244000005700 microbiome Species 0.000 abstract description 10
- 230000018044 dehydration Effects 0.000 abstract description 8
- 238000006297 dehydration reaction Methods 0.000 abstract description 8
- 235000015097 nutrients Nutrition 0.000 abstract description 5
- 102000004169 proteins and genes Human genes 0.000 abstract description 4
- 108090000623 proteins and genes Proteins 0.000 abstract description 4
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- 150000004676 glycans Chemical class 0.000 abstract description 2
- 229920001282 polysaccharide Polymers 0.000 abstract description 2
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- 230000000694 effects Effects 0.000 description 15
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a sludge modification process, which comprises the steps of sludge mixture → modification reaction → flocculation and sedimentation → filter pressing and dehydration, wherein the treated dried sludge can be comprehensively utilized, the concentration of polysaccharide and protein in the supernatant of the modified sludge subjected to flocculation and sedimentation is improved by more than 2 times, and the supernatant can be returned to a biochemical pool to be reused as microorganism nutrient substances, so that the sewage treatment cost is saved.
Description
The technical field is as follows:
the invention relates to the field of sludge treatment, in particular to a sludge modification process.
Background art:
along with the acceleration of the urbanization process in China, the urban sewage treatment rate is improved year by year, and the sludge yield of the urban sewage treatment plant is also increased sharply. If the sludge which is not properly treated enters the environment, secondary pollution is directly brought to water and the atmosphere, the functions of eliminating pollution and protecting the environment can not be fully exerted by one municipal sewage treatment plant and sludge treatment, meanwhile, the ecological environment and human activities are seriously threatened, and the sludge treatment and treatment gradually become the focus of attention at home and abroad along with the continuous improvement of the global sludge production. The pollution of the sludge to the environment mainly comes from three aspects: pathogenic microorganisms in the sludge spread diseases, and harm the health of people; microorganisms in the sludge promote organic matters to decay to generate stink, and the air is polluted along with the life cycle of the sludge; various chemicals (such as heavy metals) in the sludge contaminate the soil and groundwater.
The stink is accompanied with the life cycle of the sludge, the time is long, the pollution is large, the treatment is difficult, and the stink is one of the most difficult problems in the sludge treatment process. After the biochemical treatment of sewage, a large number of microbial cell bodies in the sludge are the reasons for the deterioration and the odor of the sludge, the poor sedimentation performance and the high water content of a filter cake, and are the root cause of a series of problems of sludge reduction, drying and the like.
The method is a common deodorization method in the treatment processes of sludge storage, transportation, drying, incineration, carbonization and the like at present, and is a remedial measure of sheep death and reinforcement after the generation of the malodor. Although the deodorant added into the sludge can remove or mask odor generating malodor of the sludge to different degrees, the effect is difficult to be sustained, and the practical application is less.
At present, the situation of 'heavy water and light sludge' in sewage treatment is changing, and more attention is paid to sludge treatment. At present, the 'volume reduction' treatment which takes gravity concentration and dehydration as main process methods is generally carried out on excess sludge generated by sewage treatment plants in China. The volume reduction treatment process and means achieve the effect of reducing the volume of the residual sludge by reducing the water content of the sludge, but components such as living microorganisms, macromolecular organic matters and the like contained in the sludge are not reduced in magnitude, so a better treatment method needs to be explored aiming at the sludge treatment.
The invention content is as follows:
the invention aims to solve the existing problems and provides a sludge modification process, which kills microorganisms in sludge in a mode of destroying microbial cell structures in the sludge or forces the microorganisms to be in a dormant state, changes or reduces the organic matter concentration in the sludge in an oxidative decomposition mode, improves the sludge settling performance, realizes the quick sludge reduction and simultaneously eliminates the property of foul odor generated by the sludge.
The technical solution of the invention is as follows:
a sludge modification process comprises the following process steps:
s1: primarily forming a sludge mixture, and mixing the original sludge with ozone to form the sludge mixture;
s2: modification reaction, namely performing modification reaction on the sludge mixture in the step S1;
s3: performing flocculation sedimentation, namely performing flocculation sedimentation on the sludge mixture subjected to the modification reaction in the step S2;
s4: and (4) filter pressing and dewatering, namely returning the supernatant of the sludge mixture subjected to flocculation and sedimentation in the step S3 to a biochemical system, performing filter pressing and dewatering treatment on the underflow to obtain deodorized sludge and filtrate, and allowing the filtrate to enter the biochemical system to finish sludge modification.
The utility model provides a modified equipment of mud, its is deposited the pond including mud, the pond is deposited to mud is connected with ozone and is added the device through the mud delivery pump, ozone is added device bottom and is linked together with the ozone machine, ozone is added the device and is connected with modified reactor through the mud delivery pump, micro-nano bubble generator has been placed to modified reactor bottom, modified reactor is connected with the flocculation reaction pond through the mud delivery pump, the flocculation reaction pond is linked together with the pressure filter.
Preferably, the modification reactor comprises a modification reaction tank, a stirrer and a micro-nano bubble generator,
the modification reaction tank is a cylinder with an opening at the top, and comprises a first sludge inlet pipe and a first sludge outlet pipe;
the stirrer is fixed in the modification reaction tank through a support frame, and comprises a motor and a stirring body, wherein the stirring body comprises a lifting shaft and a stirring sheet fixed below the lifting shaft, a rack is arranged on the lifting shaft and above the stirring sheet, a gear is meshed with the rack and is fixed at the output end of the motor, and the motor is fixed on the support frame;
the micro-nano bubble generator is positioned at the bottom of the modification reaction tank.
Preferably, the ozone adding device comprises a cylindrical tank body and a cover body covering the tank body, a second sludge inlet pipe is formed at the bottom of the tank body, the second sludge inlet pipe is tangent to the bottom surface of the tank body, a spirally-rising flow guide groove is formed in the tank body, the sludge entering direction of the second sludge inlet pipe is consistent with the spiral rising direction of the flow guide groove, a second sludge outlet pipe is formed in the cover body, and mud guards are formed in the second sludge outlet pipe in a staggered mode.
Preferably, the filter is a chamber type diaphragm filter press.
Preferably, the raw sludge comprises sludge in a secondary sedimentation tank of a sewage treatment system, sludge in a sludge concentration tank or sludge subjected to biological treatment, and the water content of the raw sludge is more than 90%.
The invention has the beneficial effects that:
1. according to the sludge modification process, the sludge is subjected to modification reaction, an ozone micro-nano advanced oxidation technology is adopted, ozone gas is made into micro-nano bubbles, so that the oxidizability of the ozone is improved, the solubility of the ozone gas in a sludge solution is increased, the ozone gas is fully contacted with the sludge, and the oxidation efficiency is improved. Ozone can destroy the microbial cell structure in the sludge, kill microbes or force the microbes to be in a dormant state, so that the sludge is not decayed and deteriorated any more, stink is emitted, and stabilization is realized.
2. According to the sludge modification process, ozone serving as a strong oxidant has the effect of oxidizing, decomposing and destroying microbial cells, after microbial cell walls in sludge are destroyed, the sludge settling performance is improved, the compression ratio is increased, the settling time is shortened, the moisture removal amount is increased under the same pressure, and the sludge is rapidly settled, deeply dehydrated and reduced under the condition that no modifier is added.
3. According to the sludge modification process, the microbial cell walls are destroyed through oxidative decomposition of ozone, polysaccharides and proteins in the microbial cells are released, and the nutrient substances enter the supernatant and the filtrate after sludge dehydration and return to a biochemical reaction system for sewage treatment, so that the biochemical reaction speed can be increased, the addition of extra nutrients is reduced, and the recycling is realized.
4. According to the sludge modification process, the stirrer is arranged in the modification reaction device, and can assist in bubble dispersion, so that the ozone micro-nano gas is fully contacted with the sludge, and the reaction efficiency is improved. So that the oxidation effect is better
5. According to the sludge modification process, the diversion groove is formed in the reaction tank, the original sludge is pumped into the reaction tank through the sludge conveying pump, the ozone is injected into the reaction tank from the bottom of the reaction tank, the original sludge spirally rises along the direction of the diversion groove to play a stirring role, so that the original sludge is more fully mixed with the ozone gas and is pumped out of the second sludge outlet pipe, the mud guards are formed in the second sludge outlet pipe in a staggered mode, the staggered mud guards can slow down the pumping speed of the sludge mixture, and the sludge mixture flows in the second sludge outlet pipe in an S shape, so that the pumping time is reduced, the contact area of the original sludge and the ozone is increased, the mixing is more fully, the reaction efficiency is improved, and the oxidation effect is better.
Drawings
FIG. 1 is a flow diagram of a sludge modification process of the present invention;
FIG. 2 is a schematic view of a sludge modification system according to the present invention;
FIG. 3 is a schematic view of the construction of a reaction tank according to the present invention;
FIG. 4 is a sectional view of a reaction tank of the present invention;
FIG. 5 is a schematic diagram of the configuration of a modification reactor of the present invention;
FIG. 6 is a schematic view of the structure of the stirrer of the present invention.
In the figure: 1 sludge delivery pump, 2 ozone adding device, 2-1 second sludge inlet pipe, 2-2 second sludge outlet pipe, 2-3 tank body, 2-4 cover body, 2-6 guide groove, 2-7 mudguard, 3 modified reactor, 3-1 modified reaction tank, 3-2 stirrer, 3-11 first sludge inlet pipe, 3-12 first sludge outlet pipe, 3-21 support frame, 3-22 motor, 3-23 stirring body, 3-24 stirring sheet, 3-25 lifting shaft, 3-26 rack, 3-27 gear, 4 flocculation reaction tank, 5 filter press, 6 ozone machine and 7 sludge storage tank.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1-6, a sludge modification process comprises the following process steps:
s1: the method comprises the steps of preliminarily forming a sludge mixture, opening a sludge delivery pump 1 and an ozone adding device 2, wherein the ozone adding device 2 generates ozone, the sludge delivery pump 1 pumps original sludge into the ozone adding device 2 from a sludge storage tank 7, the original sludge and the ozone are mixed to preliminarily form the sludge mixture, the sludge delivery pump 1 can be a booster pump, the original sludge has a water content of more than 90%, and comprises sludge in a secondary sedimentation tank of a sewage treatment system, sludge in a sludge concentration tank or sludge subjected to biological treatment.
S2: a modification reaction, in which the sludge mixture in the ozone adding device 2 in step S1 is pumped into a modification reactor 3 through a sludge transfer pump 1 to perform the modification reaction, ozone passes through a micro-nano bubble generator, the micro-nano bubble generator divides the ozone into bubbles with diameters of 50 μm to tens of nanometers, and the bubbles are between micro bubbles and nano bubbles and have physical properties that conventional bubbles do not have, the first: self-pressurizing dissolution, for bubbles with spherical interfaces, surface tension can compress gas in the bubbles, so that more gas in the bubbles is dissolved into water, and secondly: slow rising speed, the smaller the bubble diameter, the slower the rising speed of the bubble, and thirdly: gas solubility is high, and micro-nano bubble progressively reduces into the nanometer at slow ascending in-process, and at last the annihilation is dissolved in water to can improve the solubility of gas (air, oxygen, ozone, carbon dioxide etc.) in aqueous greatly, the fourth: generating a large amount of free radicals, wherein the hydroxyl free radicals have ultrahigh oxidation-reduction potential and super-strong oxidation effect, and fifth: the mass transfer efficiency is improved, so that the ozone treatment device adopts the micro-nano bubble generator to treat ozone, the oxidation effect of ozone can be more sufficient, and the escape of ozone is reduced, thereby saving energy.
S3: and (4) flocculating and settling, namely pumping the sludge mixture subjected to the modification reaction in the step S2 into a flocculating reaction tank 4 through a sludge transfer pump 1, and adding a flocculating agent for flocculating and settling. Under the assistance of the micro-nano bubbles, ozone efficiently destroys cell walls of microorganisms, decomposes and oxidizes organic matter components in the microorganisms, fundamentally changes the settling property of sludge, accelerates the settling speed of the sludge, increases the mud-water compression ratio, can reduce the amount of a flocculating agent, shortens the settling time, improves the mud content of concentrated sludge, improves the filtration efficiency, and is a well-known technology in the technical field, so that the description is omitted.
S4: filter-pressing dehydration, returning the supernatant of the sludge mixture obtained after the flocculation sedimentation in the step S3 to a biochemical system, performing filter-pressing dehydration treatment on the underflow through a filter press to obtain deodorized sludge and filtrate, allowing the filtrate to enter the biochemical system, completing sludge modification, reducing the water content of the modified sludge to below 50%, and using the modified sludge as a comprehensive utilization of dried sludge, such as being capable of being burnt as a coal additive, returning the supernatant after the flocculation sedimentation and the filtrate after the filter-pressing treatment to a biochemical reaction, retaining microbial nutrients such as sugar, protein and the like released by microbes in the sludge in the filtrate generated by the sludge filter-pressing treatment and the supernatant after the flocculation sedimentation, returning the filtrate and the supernatant to the biochemical system for sewage treatment as nutrients, saving the sewage treatment cost, and treating the sludge by adopting the method, so as to achieve sludge treatment reduction, The purpose of harmless and recycling is that the filter is a box type diaphragm filter press.
Specifically, the ozone adding device 2 comprises a cylindrical tank body 2-3 and a cover body 2-4 covering the tank body 2-3, a second sludge inlet pipe 2-1 is formed at the bottom of the tank body 2-3, the second sludge inlet pipe 2-1 is tangent to the bottom surface of the tank body 2-3, a spirally-rising flow guide groove 2-6 is formed in the tank body 2-3, the sludge inlet direction of the second sludge inlet pipe 2-1 is consistent with the spirally-rising direction of the flow guide groove 2-6, so that a sludge mixture enters the ozone adding device 2 under the suction of the sludge conveying pump 1 and is spirally raised along the rotating direction of the flow guide groove 2-6 to play a role in stirring, so that the original sludge and ozone gas are more fully mixed, the reaction efficiency is improved, and finally the mixed sludge mixture is pumped out from the second sludge outlet pipe 2-2, the mud guards 2-7 are formed inside the second mud outlet pipe 2-2 in a staggered manner, the mud guards 2-7 incline 0-15 degrees towards the direction of the modification reactor 3, the staggered mud guards 2-7 can slow down the speed of the sludge mixture, the sludge mixture flows in the second mud outlet pipe 2-2 in an S shape, the stirring effect is further achieved, the mixing is more sufficient, the reaction efficiency is improved, the oxidation effect is better, the bottom of the tank body 2-3 is communicated with the ozone machine 6, the ozone machine 6 comprises an air compressor, an ozone air cavity, an ozone generator, a jet ejector and a jet nozzle, the air compressor is communicated with the ozone air cavity through an air duct, the ozone generator is arranged in the ozone air cavity, the ozone air cavity is communicated with the jet ejector through an ozone gas pipe, and the jet ejector is arranged at the bottom of the ozone adding device 2, and the reaction tank 2 is communicated with the ozone generator, jet nozzles are arranged on the upper ring periphery of the jet device, ozone is sprayed out from the jet nozzles and enters the reaction tank 2, and the ozone generator 6 is a common mode in the technical field, so that the repeated description is omitted.
When the device is operated, switches of an air compressor and an ozone generator are turned on, compressed air generates ozone under the action of the ozone generator through an ozone air cavity, the ozone is diffused in the air, under the action of air flow, the ozone is sprayed out from a jet nozzle of a jet device positioned at the bottom of a reaction tank 2 through an ozone gas conveying pipe, original sludge is pumped into the reaction tank 2 from a sludge storage pool 7 through a second sludge inlet pipe 2-1 through a sludge conveying pump 1 and rotates and rises along the flow guide direction of a flow guide groove 2-6, the effect of the original sludge in the process of rotating, rotating and rising in the reaction tank 2 is consistent with the effect of stirring by adding a stirring rod, the original sludge and the ozone are mutually fused in the rotating and rising process, the mixed sludge mixture is more fully mixed, the sludge mixture flows out from the second sludge outlet pipe 2-2 under the action of a sludge conveying pump 1, and the sludge mixture is blocked by staggered mud guards 2-7, the sludge mixture collides with the mud guards 2-7 and rebounds, then continues to flow towards the modification reactor 3 under the suction of the sludge delivery pump 1 and is pumped into the modification reactor 3 in an S shape, so that the sludge mixture is more fully mixed, and the reaction effect is improved.
Specifically, the modification reactor 3 comprises a modification reaction tank 3-1, a stirrer 3-2 and a micro-nano bubble generator,
the modification reaction tank 3-1 is a cylinder with an opening at the top, a cover plate covers the modification reaction tank 3-1, a through hole is formed in the cover plate, a lifting shaft 3-25 can be placed in the through hole, the modification reaction tank 3-1 comprises a first sludge inlet pipe 3-11 and a first sludge outlet pipe 3-12, the first sludge inlet pipe 3-11 is communicated with the second sludge outlet pipe 2-2, and the first sludge outlet pipe 3-12 is communicated with the flocculation reaction tank 4;
the stirrer 3-2 is fixed in the modification reaction tank 3-1 through a support frame 3-21, the support frame 3-1 is positioned above the modification reaction tank 3-1 and close to a cover plate, the stirrer 3-2 comprises a motor 3-22 and a stirring body 3-23, the stirring body 3-23 comprises a lifting shaft 3-25 and a stirring sheet 3-24 fixed below the lifting shaft 3-25, a rack 3-26 is arranged above the stirring sheet 3-24 on the lifting shaft 3-25, a gear 3-27 is meshed on the rack 3-26, the gear 3-27 is fixed at the output end of the motor 3-22, the motor 3-22 is fixedly arranged on the support frame 3-21, the stirring pieces 3-24 are provided with through holes for facilitating the flow of liquid, and the distance between the rack 3-26 and the top end of the lifting shaft 3-25 is 5-8 CM, so that the gear 3-27 can be effectively prevented from sliding out of the rack 3-26.
The micro-nano bubble generator is positioned at the bottom of the modification reaction tank 3-1, divides ozone into bubbles with the diameter of 50 mu m to dozens of nanometers, increases the reaction time of ozone gas and sludge, effectively increases the treatment effect of ozone, reduces the supply demand of ozone gas, can destroy the microbial cell structure in the sludge, kill microorganisms or force the microorganisms to be in a dormant state, firstly changes or reduces the organic matter concentration in the sludge in an oxidative decomposition mode, thereby improving the sludge settling property, secondly releases more saccharides and protein substances from the sludge due to the destruction of the microbial cell wall, reduces the nutrient content of microorganisms in the dewatered sludge, reduces the water content, loses the condition of microbial propagation, achieves the deodorization effect, and stores filter cakes after filter pressing, The sludge is not smelly any more in the transportation and disposal processes, the compression plasticity of the sludge is reduced finally, the dehydration property of the sludge is improved, the water content of a filter cake after filter pressing is less, the sludge is reduced, harmless and odorless finally, and the problems of low solidification rate, stink, high transportation requirement, high operation cost and high re-disposal cost of the sludge in the conventional dehydration treatment are solved.
During specific operation, the sludge mixture enters the modification reaction tank 3-1 from the first sludge outlet pipe 3-11, the motor is controlled by the controller to continuously rotate forwards and backwards, so that the lifting shaft 3-25 continuously ascends and descends under the matching of the gear 3-27 and the rack 3-26, the stirring body 3-23 continuously ascends and descends to play a role in stirring the sludge mixture, the micro-nano bubble generator divides ozone into bubbles with the diameter of 50 microns to tens of nanometers, and under the action of the stirrer, the sludge mixture and the micro-nano ozone bubbles are more fully mixed, so that the oxidation reaction is more thorough, the utilization rate of ozone is improved, the escape of ozone is reduced, the sludge reduction, harmlessness and odorless effects are finally achieved, and the problems of low sludge solidification rate, odor and low sludge solidification rate in the conventional dehydration treatment are solved, High transportation requirement, high operation cost and high re-disposal cost.
The above description is only a preferred embodiment of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work shall fall within the scope of the present invention.
Claims (7)
1. A sludge modification process is characterized in that: the process comprises the following steps:
s1: primarily forming a sludge mixture, and mixing the original sludge with ozone to form the sludge mixture;
s2: modification reaction, namely preparing ozone micro-nano bubbles from ozone in the sludge mixture in the step S1 to perform modification reaction;
s3: performing flocculation sedimentation, namely performing flocculation sedimentation on the sludge mixture subjected to the modification reaction in the step S2;
s4: and (4) filter pressing and dewatering, namely returning the supernatant of the sludge mixture subjected to flocculation and sedimentation in the step S3 to a biochemical system, performing filter pressing and dewatering treatment on the underflow to obtain deodorized sludge and filtrate, and allowing the filtrate to enter the biochemical system to finish sludge modification.
2. The sludge modification process according to claim 1, wherein: it includes the mud system of modifying, the mud system of modifying is deposited pond (7) including mud, mud is deposited pond (7) and is connected with ozone and adds device (2) through mud delivery pump (1), ozone is added device (2) bottom and is linked together with the ozone machine, ozone is added device (2) and is connected with modified reactor (3) through mud delivery pump (1), micro-nano bubble generator has been placed to modified reactor (3) bottom, modified reactor is connected with flocculation reaction pond (4) through mud delivery pump (1), flocculation reaction pond (4) are linked together with pressure filter (5).
3. The sludge modification process according to claim 2, wherein: the ozone adding device (2) comprises a cylindrical tank body (2-3) and a cover body (2-4) which is covered on the tank body (2-3), a second sludge inlet pipe (2-1) is formed at the bottom of the tank body (2-3), the second sludge inlet pipe (2-1) is tangent to the bottom surface of the tank body (2-3), a spiral rising flow guide groove (2-6) is formed in the tank body (2-3), the sludge entering direction of the second sludge inlet pipe (2-1) is consistent with the spiral rising direction of the flow guide groove (2-6), a second mud outlet pipe (2-2) is formed on the cover body (2-4), mud guards (2-7) are formed inside the second mud outlet pipe (2-2) in a staggered mode, the bottom of the ozone adding device (2) is communicated with an ozone machine (6).
4. The sludge modification process according to claim 2, wherein:
the modification reactor (3) comprises a modification reaction tank (3-1), a stirrer (3-2) and a micro-nano bubble generator,
the modification reaction tank (3-1) is a cylinder with an opening at the top, and comprises a first sludge inlet pipe (3-11) and a first sludge outlet pipe (3-12);
the stirrer (3-2) is fixed in the modification reaction tank (3-1) through a support frame (3-21), the stirrer (3-2) comprises a motor (3-22) and a stirring body (3-23), the stirring body (3-23) comprises a lifting shaft (3-25) and a stirring sheet (3-24) fixed below the lifting shaft (3-25), a rack (3-26) is arranged above the lifting shaft (3-25) and positioned above the stirring sheet, a gear (3-27) is meshed on the rack (3-26), the gear (3-27) is fixed at the output end of the motor (3-22), and the motor (3-22) is fixed on the support frame (3-21);
the micro-nano bubble generator is positioned at the bottom of the modification reaction tank (3-1).
5. The sludge modification process according to claim 2, wherein: the filter (5) is a box type diaphragm filter press.
6. The sludge modification process according to claim 1, wherein: the sludge conveying pump (1) can be a booster pump.
7. The sludge modification process according to claim 1, wherein: the raw sludge comprises sludge in a secondary sedimentation tank of a sewage treatment system, sludge in a sludge concentration tank or sludge subjected to biological treatment, and the water content of the raw sludge is more than 90%.
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