CN113149391A - Ultrahigh dissolved oxygen water treatment method and system for sludge concentration tank - Google Patents
Ultrahigh dissolved oxygen water treatment method and system for sludge concentration tank Download PDFInfo
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- CN113149391A CN113149391A CN202110400433.6A CN202110400433A CN113149391A CN 113149391 A CN113149391 A CN 113149391A CN 202110400433 A CN202110400433 A CN 202110400433A CN 113149391 A CN113149391 A CN 113149391A
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- 239000010802 sludge Substances 0.000 title claims abstract description 317
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 248
- 239000001301 oxygen Substances 0.000 title claims abstract description 248
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 248
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 31
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- 244000005700 microbiome Species 0.000 claims abstract description 14
- 241000894006 Bacteria Species 0.000 claims abstract description 9
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims description 40
- 239000010865 sewage Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 230000002401 inhibitory effect Effects 0.000 claims description 5
- 230000001737 promoting effect Effects 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 10
- 230000029087 digestion Effects 0.000 abstract description 8
- 238000012546 transfer Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000005842 biochemical reaction Methods 0.000 abstract description 5
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- 238000005273 aeration Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 230000003203 everyday effect Effects 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920002527 Glycogen Polymers 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 230000035943 smell Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
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- 239000002957 persistent organic pollutant Substances 0.000 description 1
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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Abstract
The application provides a method and a system for treating ultrahigh dissolved oxygen water for a sludge concentration tank, wherein the ultrahigh dissolved oxygen water is fully and uniformly mixed with wet sludge in a sludge inlet pipe by using a pipeline mixer, so that nano-scale dissolved oxygen is injected to the bottom of the sludge concentration tank along with the sludge through a sludge inlet pipe, and the microbial respiration in the sludge concentration tank is promoted to digest the sludge, the phosphorus accumulation bacteria in the sludge concentration tank are inhibited to release phosphorus anaerobically, and the odor is eliminated under the condition that the bottom sludge is not disturbed by visible bubbles. The method utilizes the characteristics of extremely small particle size and extremely low rising speed of oxygen bubbles in the ultrahigh dissolved oxygen water, and can realize oxygen mass transfer efficiency of 85-96% to sludge, thereby fully participating in biochemical reactions of microorganisms and bacterial colonies in the pool. The operation energy consumption of the device is reduced by more than 40% compared with that of the traditional aerobic digestion mode, and meanwhile, the treatment time is only 1/20 of the traditional mode. The application can effectively reduce the dry sludge discharge and obviously reduce the sludge discharge MLVSS.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a method and a system for treating ultrahigh dissolved oxygen water for a sludge concentration tank.
Background
Sludge concentration is an effective method for reducing the water content and the volume of sludge. The sludge concentration tank is usually connected behind a sedimentation tank in the sewage treatment system, and the interstitial water of the sludge is reduced by a gravity concentration method, an air flotation concentration method or a centrifugal concentration method, so that the water content of the sludge is reduced, the sludge is thickened, and the volume of the sludge is reduced to be beneficial to subsequent dehydration treatment.
However, in the existing sewage treatment project, the interior of the sludge concentration tank is usually in an anaerobic state. Under the anaerobic condition, the phosphorus accumulating bacteria consume glycogen, hydrolyze intracellular phosphate into orthophosphate and release the orthophosphate to the outside of the cells, acquire energy from the orthophosphate, and simultaneously store the organic carbon source in the environment in the form of intracellular carbon energy storage. Because the retention time of the sludge in the gravity concentration tank is long, the release of phosphorus and the generation of odor are easy to generate, and the surrounding environment is influenced.
Disclosure of Invention
The application aims at the defects of the prior art and provides the ultrahigh dissolved oxygen water treatment method and the system for the sludge concentration tank, the ultrahigh dissolved oxygen water is filled into a sludge inlet pipe of the sludge concentration tank by utilizing a pipeline mixer, a large amount of nanoscale dissolved oxygen in the ultrahigh dissolved oxygen water can be utilized to improve the mass transfer efficiency of sludge, the sludge amount is reduced, and the anaerobic phosphorus release of microbial colonies in the sludge concentration tank is inhibited. The technical scheme is specifically adopted in the application.
First, to achieve the above objects, there is provided an ultra-high dissolved oxygen water treatment system for a sludge concentration tank, including the following devices disposed upstream of the sludge concentration tank: the super dissolved oxygen preparation equipment is internally provided with a high-pressure capillary tube, and pure oxygen is directly dissolved into water by the high-pressure capillary tube to generate super dissolved oxygen water with the oxygen content of 300-400 mg/L; the pipeline mixer is arranged on a sludge inlet pipe of the sludge concentration tank, is connected with the output end of the super dissolved oxygen preparation equipment through a super dissolved oxygen adding pipe, receives super dissolved oxygen water at the output end of the super dissolved oxygen preparation equipment, and injects the super dissolved oxygen water into the sludge inlet pipe of the sludge concentration tank according to a preset adding amount; the sludge inlet pipe is connected to the bottom of the sludge concentration tank, and the ultrahigh dissolved oxygen water and the sludge are fully mixed in the pipeline mixer and/or the sludge inlet pipe and then are put into the sludge concentration tank; under the condition that no visible bubbles disturb the sludge at the bottom of the sewage concentration tank, the nano-scale dissolved oxygen distributed in the ultrahigh dissolved oxygen water promotes the endogenous respiration of microorganisms in the sewage concentration tank to digest the sludge, inhibits phosphorus-accumulating bacteria in the sewage concentration tank from releasing phosphorus anaerobically, and eliminates odor.
Optionally, the system for treating ultra-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein the preset adding amount is: correspondingly throwing 10-30 m into the sludge concentration tank when one ton of dry sludge is treated by the sludge concentration tank3Ultrahigh dissolved oxygen water; the sludge conveyed by the sludge inlet pipe is wet sludge, and the water content of the wet sludge is between 99.1% and 99.2%.
Optionally, the system for treating ultra-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein when the ultra-high dissolved oxygen water digests sludge in the sludge concentration tank, the hydraulic retention time of the ultra-high dissolved oxygen water and wet sludge is at least 10 hours.
Optionally, the system for treating ultra-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein when the ultra-high dissolved oxygen water digests sludge in the sludge concentration tank, the hydraulic retention time of the ultra-high dissolved oxygen water and wet sludge is 12 to 24 hours.
Optionally, the system for treating ultra-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein the ultra-dissolved oxygen preparation apparatus comprises: the air compressor is used for compressing air; the input port of the air compressor buffer tank is connected with the air compressor and is used for receiving and temporarily storing compressed air; the input end of the oxygen generator is connected with the output port of the air pressure buffer tank and is used for extracting oxygen in the compressed air; the input port of the oxygen process tank is connected with the output port of the oxygen generator and is used for receiving and temporarily storing the prepared oxygen; the input port of the supercharger is connected with the oxygen process tank, and the output port of the supercharger is connected with the oxygen storage tank and used for increasing the air pressure of the oxygen temporarily stored in the oxygen storage tank; the super dissolved oxygen preparation machine is characterized in that two input ports of the super dissolved oxygen preparation machine are respectively connected with a water inlet pipe and an oxygen storage tank, and a high-pressure capillary tube with the pressure of 0.15Mpa is arranged in the super dissolved oxygen preparation machine and used for directly dissolving high-pressure oxygen from the oxygen storage tank into water through the high-pressure capillary tube to generate rough dissolved oxygen water with the oxygen content of 300-400 mg/L; and the filter is connected between the output port of the super dissolved oxygen preparation machine and the output end of the super dissolved oxygen preparation equipment, and is used for filtering the crude dissolved oxygen water prepared by the super dissolved oxygen preparation machine and then outputting the super dissolved oxygen water.
Optionally, the system for treating super-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein the upstream of the sludge inlet pipe receives excess biochemical sludge and excess materialized sludge, and the downstream of the sludge inlet pipe is connected to the sludge concentration tank; the pipeline mixer is arranged in the sludge inlet pipe close to the sludge concentration tank.
Meanwhile, in order to achieve the above object, the present application also provides a method for treating ultra-high dissolved oxygen water for a sludge concentration tank, comprising the steps of: firstly, directly dissolving pure oxygen into water in a super dissolved oxygen preparation device by using a high-pressure capillary tube with internal pressure of 0.15Mpa to generate super dissolved oxygen water with oxygen content of 300-400 mg/L; secondly, pumping the ultrahigh dissolved oxygen water obtained in the first step into a feed inlet of a pipeline mixer through an ultrahigh dissolved oxygen feeding pipe according to a preset feeding amount; thirdly, the added ultrahigh dissolved oxygen water is fully mixed with wet sludge in the pipeline mixer and/or in a sludge inlet pipe connected with a discharge port of the pipeline mixer, and then is put into the bottom of a sludge concentration tank; and fourthly, under the condition that no visible bubbles disturb the sludge at the bottom of the sludge concentration tank, promoting the internal respiration of microorganisms in the sludge concentration tank by using the nano-scale dissolved oxygen distributed in the ultrahigh dissolved oxygen water to digest the sludge, inhibiting phosphorus-accumulating bacteria in the sludge concentration tank from anaerobically releasing phosphorus, and eliminating odor.
Optionally, the method for treating ultra-high dissolved oxygen water for a sludge concentration tank as described in any one of the above, wherein the predetermined adding amount in the second step is: correspondingly throwing 10-30 m into the sludge concentration tank when one ton of dry sludge is treated by the sludge concentration tank3Ultrahigh dissolved oxygen water; the moisture content of the wet sludge is between 99.1% and 99.2%.
Optionally, in the fourth step, when the sludge in the sludge concentration tank is digested by the ultra-high dissolved oxygen water, the hydraulic retention time of the ultra-high dissolved oxygen water and the wet sludge is 12 to 24 hours.
Optionally, in the method for treating ultrahigh dissolved oxygen water in a sludge concentration tank, wet sludge in the sludge inlet pipe is derived from excess biochemical sludge and excess materialized sludge, the wet sludge enters the pipeline mixer from another inlet of the pipeline mixer, and the sludge is uniformly mixed with ultrahigh dissolved oxygen water in the pipeline mixer.
Advantageous effects
The device utilizes the pipeline mixer to fully and uniformly mix the ultrahigh dissolved oxygen water with wet sludge in the sludge inlet pipe, so that the nano-scale dissolved oxygen is injected into the bottom of the sludge concentration tank along with the sludge through the sludge inlet pipe, the microbial respiration in the sludge concentration tank is promoted to digest the sludge under the state that the bottom sludge is disturbed by no visible bubbles, the phosphorus accumulation bacteria in the sludge concentration tank are inhibited to release phosphorus anaerobically, and the odor is eliminated. The method utilizes the characteristics of extremely small particle size and extremely low rising speed of oxygen bubbles in the ultrahigh dissolved oxygen water, and can realize oxygen mass transfer efficiency of 85-96% to sludge, thereby fully participating in biochemical reactions of microorganisms and bacterial colonies in the pool. The operation energy consumption of the device is reduced by more than 40% compared with that of the traditional aerobic digestion mode, and meanwhile, the treatment time is only 1/20 of the traditional mode. The application can effectively reduce the dry sludge discharge and obviously reduce the sludge discharge MLVSS.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:
FIG. 1 is a schematic flow diagram of a process for producing super dissolved oxygen as used herein;
FIG. 2 is a schematic view of a sludge treatment system to which the present application is applied;
FIG. 3 is a schematic diagram of an ultra-high dissolved oxygen water treatment system for a sludge thickener according to the present application;
FIG. 4 is a schematic view of the sludge modification apparatus room of FIG. 3;
FIG. 5 is a comparison graph of sludge decrement data before and after adding super dissolved oxygen in the system of FIG. 2;
FIG. 6 shows the MLVSS change of the inlet and outlet sludge before and after adding the super dissolved oxygen in the system shown in FIG. 2.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The meaning of "inside and outside" in this application means that the direction pointing towards the medium contained or circulating inside is inside and vice versa with respect to the sludge thickener or pipe mixer itself; and not as a specific limitation on the mechanism of the device of the present application.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
Fig. 2 and 3 show an ultra-high dissolved oxygen water treatment system for a sludge concentration tank according to the present application, which includes the following devices disposed upstream of the sludge concentration tank:
the super dissolved oxygen preparation equipment can be realized by the device shown in fig. 1, can be arranged in a relatively independent sludge modification equipment room in a mode shown in fig. 4, and directly dissolves pure oxygen into water by utilizing a high-pressure capillary tube arranged in the equipment to generate super high dissolved oxygen water with the oxygen content of 300-400 mg/L;
the pipeline mixer is arranged on a sludge inlet pipe of the sludge concentration tank, is connected with the output end of the super dissolved oxygen preparation equipment through a super dissolved oxygen adding pipe, receives super dissolved oxygen water at the output end of the super dissolved oxygen preparation equipment, and injects the super dissolved oxygen water into the sludge inlet pipe of the sludge concentration tank according to a preset adding amount;
the sludge inlet pipe is connected to the bottom of the sludge concentration tank and is used for conveying wet sludge with the water content of 99.1-99.2% and ultrahigh dissolved oxygen water mixed in the wet sludge, and the ultrahigh dissolved oxygen water and the sludge are fully mixed in the pipeline mixer and/or the sludge inlet pipe and then are put into the sludge concentration tank;
the sewage concentration tank realizes oxygen mass transfer efficiency of 85-96% to sludge by using nano-scale dissolved oxygen distributed in ultrahigh dissolved oxygen water under the condition that no visible bubbles disturb the sludge at the bottom of the sewage concentration tank, thereby promoting endogenous respiration of microorganisms in the sewage concentration tank to digest the sludge, inhibiting phosphorus-accumulating bacteria in the sewage concentration tank from anaerobically releasing phosphorus, and eliminating odor.
In the specific working process, the preset adding amount of the ultrahigh dissolved oxygen water is generally set as follows: when one ton of dry sludge is treated by the sludge concentration tank, 10-30 m of dry sludge is uniformly fed into the sludge concentration tank at a fixed flow speed in the process correspondingly3Ultrahigh dissolved oxygen water. 90% of dissolved oxygen in the ultrahigh dissolved oxygen exists in a nanometer level, and the characteristics of extremely small particle size and extremely low rising speed of oxygen bubbles in the ultrahigh dissolved oxygen can be utilized to slowly rise oxygen in the ultrahigh dissolved oxygen, so that the high-efficiency oxygen mass transfer efficiency is realized with sludge, and the oxygen content of the whole sludge concentration tank is uniformly improved under the condition that no visible bubbles stir the sludge to influence the sludge settlement. Due to the characteristics of the nanoscale oxygen bubbles in the ultrahigh dissolved oxygen water, an aeration device does not need to be installed independently, and additional aeration mechanical equipment does not need to be added, so that the operation energy consumption of the system is lower than that of the traditional aerobic digestion mode by more than 40%. In addition, because the mass transfer efficiency of the nano-scale bubbles in the ultrahigh dissolved oxygen water is as high as 85-96%, the hydraulic retention time of the ultrahigh dissolved oxygen water and the wet sludge in the sludge concentration tank can be only about 10 hours to digest the sludge.
The practical effect of the ultra-high dissolved oxygen water treatment technology of the present application is specifically verified by the sludge treatment system shown in fig. 2.
The sludge treatment system shown in fig. 2 is provided with a secondary sedimentation tank, a high-density tank and/or an MBR (Membrane Bioreactor) tank at the upstream of a sludge inlet pipe, and a plurality of corresponding sludge concentration tanks are connected at the downstream of the sludge inlet pipe, so that the sludge from the upstream and the excess biochemical sludge are received by the sludge inlet pipe and are uniformly mixed with the ultrahigh dissolved oxygen water by a pipeline mixer arranged at the downstream of the sludge inlet pipe, and the mixture is input to the sludge concentration tanks for digestion treatment. In the system, a pipeline mixer is arranged in a sludge inlet pipe close to a sludge concentration tank, the downstream of the sludge inlet pipe is communicated with the bottom of the sludge concentration tank, and wet sludge to be treated mixed with nano-scale dissolved oxygen is injected into the sludge concentration tank from bottom to top.
Specifically, in the system, the sludge in the sludge concentration tank 1# and the sludge concentration tank 2# mainly comes from a secondary sedimentation tank, the sludge in the sludge concentration tank 3# comes from the secondary sedimentation tank and a high-density tank, the sludge in the sludge concentration tank 4# comes from an MBR tank, the sludge is mixed with ultrahigh dissolved oxygen water by a pipeline mixer connected with a sludge inlet pipe, and after the sludge is concentrated, the sludge is input into the sludge tank for treatment and discharge.
The super dissolved oxygen water in the system is provided by super dissolved oxygen preparation equipment arranged in the sludge modification preparation room. The apparatus comprises the following components shown in fig. 1 or fig. 4:
the air compressor is used for compressing air;
the input port of the air compressor buffer tank is connected with the air compressor and is used for receiving and temporarily storing compressed air;
the input end of the oxygen generator is connected with the output port of the air pressure buffer tank and is used for extracting oxygen in the compressed air;
the input port of the oxygen process tank is connected with the output port of the oxygen generator and is used for receiving and temporarily storing the prepared oxygen;
the input port of the supercharger is connected with the oxygen process tank, and the output port of the supercharger is connected with the oxygen storage tank and used for increasing the air pressure of the oxygen temporarily stored in the oxygen storage tank;
the super dissolved oxygen preparation machine is characterized in that two input ports of the super dissolved oxygen preparation machine are respectively connected with a water inlet pipe and an oxygen storage tank, and a high-pressure capillary tube with the pressure of 0.15Mpa is arranged in the super dissolved oxygen preparation machine and used for directly dissolving high-pressure oxygen from the oxygen storage tank into water through the high-pressure capillary tube to generate rough dissolved oxygen water with the oxygen content of 300-400 mg/L;
and the filter is connected between the output port of the super dissolved oxygen preparation machine and the output end of the super dissolved oxygen preparation equipment, and is used for filtering the crude dissolved oxygen water prepared by the super dissolved oxygen preparation machine and then outputting the super dissolved oxygen water.
The oxygen content of the ultrahigh dissolved oxygen water prepared by the equipment is 300-400 mg/L, more than 90% of dissolved oxygen is dissolved in water in a nano-scale bubble form, and the dissolved oxygen can be fully and uniformly mixed with sludge entering a sludge concentration tank through a pipeline mixer so as to realize the oxygen mass transfer efficiency of 85-96%, thereby providing sufficient oxygen for the sludge and enabling the sludge to fully participate in the biochemical reaction of microorganisms and bacterial colonies in the tank under the state of not stirring the sludge. The operation energy consumption of this application reduces more than 40% than traditional good oxygen digestion mode, and simultaneously, the hydraulic power dwell time of super high dissolved oxygen water and wet mud when super high dissolved oxygen water digests mud in the sludge concentration pond generally only needs 12 ~ 24 hours, and its processing time only has 1/20 of traditional mode. Because the anaerobic biochemical reaction is controlled by the dissolved oxygen in the treatment process, the method can effectively improve the digestion treatment efficiency, thereby reducing the discharge capacity of dry sludge, obviously reducing the MLVSS of the discharged sludge and simultaneously saving the cost and the energy consumption of aeration equipment. In the floor plan of the apparatus shown in fig. 4, it can be seen that the above-described apparatuses are roughly classified into two types: respectively an oxygen making device and a super dissolved oxygen water making device. Wherein, the oxygen generating equipment is realized by an oxygen generator, an air compressor, a supercharger and an oxygen storage tank; the equipment for preparing the super dissolved oxygen water is mainly realized by a super dissolved oxygen preparation machine. The oxygen generator extracts oxygen in the air and stores the oxygen in an oxygen storage tank; the super dissolved oxygen preparation equipment dissolves oxygen into water in an ultrahigh pressure environment, and the oxygen content of high dissolved oxygen water under a normal pressure state reaches 300 mg/L; injecting high dissolved oxygen water into a pipeline mixer, mixing the high dissolved oxygen water with sludge with the water content of about 99.2 percent, and then entering a concentration tank for reaction.
4 sludge concentration tanks 1# to 4# constructed in the project treat wet sludge in an amount of 4181m3D (water content 99.15%) and 35.5 tons of dry sludge.
The super dissolved oxygen preparation equipment arranged in the sludge modification preparation room mixes super dissolved oxygen with wet sludge through a pipeline mixer and then feeds the mixture into a concentration tank, and the specific flow is shown in the figure, and aims at the 4181m of the concentration tank3The wet sludge treatment amount/d, the designed adding amount of dissolved oxygen in the pipeline of the pipeline mixer can be set to be 4.5-22.5 kg/h. The pipeline mixer is selectableThe commercially available finished products generally realize several mixing modes of nozzle type, vortex type, porous plate and profiled plate type by arranging a nozzle, a vortex chamber, a porous plate or a profiled plate and other elements for promoting mixing in a pipeline. The original paper that promotes mixing among the used pipeline mixer of this application generally sets up the three-section pipeline and uses jointly, constitutes a mixing unit. In its terms, the number of mixing units or the number of pipe sections or the specific number of mixing-promoting elements in a mixing unit can also be increased or decreased accordingly, depending on the properties of the mixing medium. Due to the effect of the mixing unit, the wet sludge input to the bottom of the sludge concentration tank in the system is fully mixed with a proper amount of ultrahigh dissolved oxygen water, so that a stirring device or an aeration device is not required to be arranged, and the biochemical reaction of microorganisms or bacterial colonies in the tank can be effectively supplied only by virtue of the mass transfer effect of nano-scale oxygen bubbles mixed in the sludge, thereby realizing the digestion effect on the sludge.
In order to verify the operation effect of the system, after the sludge concentration tank 3# and the sludge concentration tank 4# are shut down, the following test schemes are executed through the sludge pipe flow meters on the sludge concentration tanks 1# and 2# and the test data shown in fig. 5 and 6 are obtained:
firstly, closing valves for discharging sludge from a sludge concentration tank 3# and a sludge concentration tank 4# to a sludge storage tank;
secondly, the sludge feeding amount of the sludge concentration tank 1# and the sludge concentration tank 2# is kept to be about 1000m in total every day3；
Recording the sludge amount M1 and M2 from the secondary sedimentation tank to the sludge concentration tank 1# and the sludge concentration tank 2 #;
recording the sludge amount M5 transmitted to the Council by the sludge storage tank;
taking sludge samples of a sludge concentration tank 1# and a sludge concentration tank 2# every day 1 hour after the sludge pump is started, in the middle time and 1 hour before the pump is stopped, and detecting the water content;
sixthly, when the sludge is discharged, taking a sludge sample 2 hours after the sludge outward delivery pump is opened, and detecting the water content of the sludge;
seventhly, calculating the total dry weight of sludge fed every day and the dry weight of sludge discharged every day;
and calculating the difference between the dry weight of the sludge entering and the dry weight of the sludge discharging to determine the sludge decrement.
In fig. 5, the data of the sludge reduction is calculated by comparing the dry weight of the sludge inlet with the dry weight of the sludge discharge, and it can be seen that:
during the period of no adding of super dissolved oxygen (9 months, 18 days and before), the comparison between the dry weight of the sludge entering water and the dry weight of the sludge leaving water is uncertain, namely, the sludge entering and the sludge leaving are not absolutely balanced, and the sludge leaving amount is more or less under the condition of relatively stable sludge entering amount;
secondly, during the period of adding the super dissolved oxygen (9 months, 19 days and later), under the condition that the sludge inlet amount and the water content are relatively stable, the sludge concentration of the discharged sludge is lower and lower, the sludge amount is lower and lower, and the sludge decrement shows a gradually rising trend;
tests prove that the sludge modification system has an obvious sludge reduction effect, the maximum average daily reduction of the two sludge concentration tanks during operation reaches more than 10t (measured by dry sludge), and the reduction can be reduced by more than 200 t/day (measured by water content of 95%) equivalently to normal sludge discharge.
In fig. 6, the reduction of sludge is reflected by the reduction of MLVSS in sludge, and it can be seen that:
the MLVSS content of sludge entering the sludge concentration tank 1# and the sludge concentration tank 2# is relatively stable, and the average value is about 8000 mg/L.
Secondly, the output sludge MLVSS is maintained at a higher level before adding the super dissolved oxygen, and the phenomenon of great reduction appears after using the super dissolved oxygen, and is reduced from about 15000mg/L to about 6000 mg/L.
And thirdly, from the change of MLVSS, the super dissolved oxygen can effectively clear up and remove the organic components in the sludge, and the super dissolved oxygen in the water is utilized to enable the microorganisms in the sludge to be in the endogenous respiration stage for self oxidation, thereby playing the effects of sludge modification and reduction.
Under other implementation modes, the super dissolved oxygen preparation equipment arranged in the sludge modification preparation room in the system can replace the air oxygen generator in the implementation mode by directly purchasing liquid oxygen so as to simplify the preparation process of oxygen. The oxygen preparation mode does not influence the sludge treatment effect of the system.
From this, this application is through the super high dissolved oxygen water of premixing in the mud pipe line of advancing at the sludge thickening pond, can realize following effect:
(1) sludge reduction
The essence of the method is that the microorganisms in the sludge are in the endogenous respiration stage by utilizing the ultrahigh dissolved oxygen in the water to carry out self-oxidation. Since the ratio of organic matter to microorganisms (F/M) is relatively low at this stage, cell synthesis, mainly cell lysis by endogenous metabolism and destruction of cellular components, occurs less frequently, and thus a high sludge reduction can be achieved.
(2) Inhibiting anaerobic phosphorus release
Under the anaerobic condition, the phosphorus accumulating bacteria consume glycogen, hydrolyze intracellular phosphate into orthophosphate and release the orthophosphate to the outside of the cells, acquire energy from the orthophosphate, and simultaneously store the organic carbon source in the environment in the form of intracellular carbon energy storage. The residence time of the gravity thickening tank is very long and therefore the release of phosphorus tends to occur.
The super dissolved oxygen can inhibit anaerobic phosphorus release from two aspects, on one hand, the dissolved oxygen level of the concentration tank is improved, and on the other hand, the carbon source consumption of microorganisms is promoted. Thereby inhibiting anaerobic phosphorus release and improving the quality of supernatant.
(3) Eliminating foul smell
In the oxidative decomposition process, the oxygen consumption rate of a large amount of organic pollutants, organic reduction nitrogen, phosphorus and other exogenous pollutants is greater than the reoxygenation rate, so that the dissolved oxygen concentration is reduced and the dissolved oxygen is in an anoxic or anaerobic state. Subsequently, the anaerobic microorganisms propagate in a large quantity to promote the decomposition, the putrefaction and the fermentation of organic matters, and meanwhile, malodorous gases such as methane, hydrogen sulfide gas and the like are generated to escape from the water surface and enter the atmosphere to blacken and foul. Before adding the super dissolved oxygen, the sludge concentration tank disclosed by the application gives off odor, and sampled sludge turns black and smells; during the period of adding the super dissolved oxygen, the odor in the sludge concentration tank is completely eliminated, and the sampled sludge sample is obviously changed into light brown.
(4) Saving processing cost
The hydraulic retention time of the traditional aerobic digestion is 10-25 d, air aeration or mechanical aeration is adopted, and the operation energy consumption is very high.
The hydraulic retention time of the super dissolved oxygen digested sludge is enough only according to 12-24 hours or at least not less than 10 hours of the design of the concentration tank, and the corresponding operation energy consumption is greatly reduced.
The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.
Claims (10)
1. An ultra-high dissolved oxygen water treatment system for a sludge thickener, comprising the following means disposed upstream of the sludge thickener:
the super dissolved oxygen preparation equipment is internally provided with a high-pressure capillary tube, and pure oxygen is directly dissolved into water by the high-pressure capillary tube to generate super dissolved oxygen water with the oxygen content of 300-400 mg/L;
the pipeline mixer is arranged on a sludge inlet pipe of the sludge concentration tank, is connected with the output end of the super dissolved oxygen preparation equipment through a super dissolved oxygen adding pipe, receives super dissolved oxygen water at the output end of the super dissolved oxygen preparation equipment, and injects the super dissolved oxygen water into the sludge inlet pipe of the sludge concentration tank according to a preset adding amount;
the sludge inlet pipe is connected to the bottom of the sludge concentration tank, and the ultrahigh dissolved oxygen water and the sludge are fully mixed in the pipeline mixer and/or the sludge inlet pipe and then are put into the sludge concentration tank;
under the condition that no visible bubbles disturb the sludge at the bottom of the sewage concentration tank, the nano-scale dissolved oxygen distributed in the ultrahigh dissolved oxygen water promotes the endogenous respiration of microorganisms in the sewage concentration tank to digest the sludge, inhibits phosphorus-accumulating bacteria in the sewage concentration tank from releasing phosphorus anaerobically, and eliminates odor.
2. The system for treating ultra-high dissolved oxygen water for a sludge concentration tank according to claim 1, wherein the preset dosage is: correspondingly throwing 10-30 m into the sludge concentration tank when one ton of dry sludge is treated by the sludge concentration tank3Ultra high dissolutionOxygen water;
the sludge conveyed by the sludge inlet pipe is wet sludge, and the water content of the wet sludge is between 99.1% and 99.2%.
3. The system for treating ultra-high dissolved oxygen water for a sludge concentrating pond of claim 2, wherein the hydraulic retention time of ultra-high dissolved oxygen water and wet sludge in the sludge concentrating pond is at least 10 hours when the ultra-high dissolved oxygen water digests the sludge.
4. The system for treating ultra-high dissolved oxygen water for a sludge concentration tank according to claim 3, wherein the hydraulic retention time of ultra-high dissolved oxygen water and wet sludge in the sludge concentration tank is 12 to 24 hours when the ultra-high dissolved oxygen water digests the sludge.
5. The ultra-high dissolved oxygen water treatment system for a sludge concentration tank according to claims 2 to 5, wherein the ultra-dissolved oxygen producing apparatus comprises:
the air compressor is used for compressing air;
the input port of the air compressor buffer tank is connected with the air compressor and is used for receiving and temporarily storing compressed air;
the input end of the oxygen generator is connected with the output port of the air pressure buffer tank and is used for extracting oxygen in the compressed air;
the input port of the oxygen process tank is connected with the output port of the oxygen generator and is used for receiving and temporarily storing the prepared oxygen;
the input port of the supercharger is connected with the oxygen process tank, and the output port of the supercharger is connected with the oxygen storage tank and used for increasing the air pressure of the oxygen temporarily stored in the oxygen storage tank;
the super dissolved oxygen preparation machine is characterized in that two input ports of the super dissolved oxygen preparation machine are respectively connected with a water inlet pipe and an oxygen storage tank, and a high-pressure capillary tube with the pressure of 0.15Mpa is arranged in the super dissolved oxygen preparation machine and used for directly dissolving high-pressure oxygen from the oxygen storage tank into water through the high-pressure capillary tube to generate rough dissolved oxygen water with the oxygen content of 300-400 mg/L;
and the filter is connected between the output port of the super dissolved oxygen preparation machine and the output end of the super dissolved oxygen preparation equipment, and is used for filtering the crude dissolved oxygen water prepared by the super dissolved oxygen preparation machine and then outputting the super dissolved oxygen water.
6. The system as claimed in claims 2 to 5, wherein the sludge inlet pipe receives excess biochemical sludge and excess materialized sludge at an upstream side, and the sludge inlet pipe is connected to the sludge concentration tank at a downstream side;
the pipeline mixer is arranged in the sludge inlet pipe close to the sludge concentration tank.
7. A method for treating ultrahigh dissolved oxygen water for a sludge concentration tank is characterized by comprising the following steps:
firstly, directly dissolving pure oxygen into water in a super dissolved oxygen preparation device by using a high-pressure capillary tube with internal pressure of 0.15Mpa to generate super dissolved oxygen water with oxygen content of 300-400 mg/L;
secondly, pumping the ultrahigh dissolved oxygen water obtained in the first step into a feed inlet of a pipeline mixer through an ultrahigh dissolved oxygen feeding pipe according to a preset feeding amount;
thirdly, the added ultrahigh dissolved oxygen water is fully mixed with wet sludge in the pipeline mixer and/or in a sludge inlet pipe connected with a discharge port of the pipeline mixer, and then is put into the bottom of a sludge concentration tank;
and fourthly, under the condition that no visible bubbles disturb the sludge at the bottom of the sludge concentration tank, promoting the internal respiration of microorganisms in the sludge concentration tank by using the nano-scale dissolved oxygen distributed in the ultrahigh dissolved oxygen water to digest the sludge, inhibiting phosphorus-accumulating bacteria in the sludge concentration tank from anaerobically releasing phosphorus, and eliminating odor.
8. The method of treating ultra-high dissolved oxygen water for a sludge concentration tank according to claim 7, wherein the predetermined amount of addition in the second step is: correspondingly throwing 10-30 m into the sludge concentration tank when one ton of dry sludge is treated by the sludge concentration tank3Ultrahigh dissolved oxygen water;
the moisture content of the wet sludge is between 99.1% and 99.2%.
9. The method for treating ultra-high dissolved oxygen water for a sludge concentration tank according to claims 7 to 8, wherein in the fourth step, when the ultra-high dissolved oxygen water digests the sludge in the sludge concentration tank, the hydraulic retention time of the ultra-high dissolved oxygen water and the wet sludge is 12 to 24 hours.
10. The method for treating ultra-high dissolved oxygen water for a sludge concentration tank as claimed in claims 7 to 9, wherein wet sludge inside the sludge inlet pipe is derived from excess biochemical sludge and excess materialized sludge, the wet sludge enters the pipe mixer from the other inlet port of the pipe mixer, and the sludge is uniformly mixed with the ultra-high dissolved oxygen water in the pipe mixer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206970323U (en) * | 2017-06-13 | 2018-02-06 | 广西益江环保科技股份有限公司 | A kind of integrated sewage disposal system of pure oxygen aeration |
| CN111995204A (en) * | 2020-06-05 | 2020-11-27 | 北京赛富威环境工程技术有限公司 | Sludge reduction method adopting high-purity pure oxygen combined with microbial treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206970323U (en) * | 2017-06-13 | 2018-02-06 | 广西益江环保科技股份有限公司 | A kind of integrated sewage disposal system of pure oxygen aeration |
| CN111995204A (en) * | 2020-06-05 | 2020-11-27 | 北京赛富威环境工程技术有限公司 | Sludge reduction method adopting high-purity pure oxygen combined with microbial treatment |
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