CN208649147U - The power self-support type sludge resource circulatory system - Google Patents

The power self-support type sludge resource circulatory system Download PDF

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CN208649147U
CN208649147U CN201821093776.2U CN201821093776U CN208649147U CN 208649147 U CN208649147 U CN 208649147U CN 201821093776 U CN201821093776 U CN 201821093776U CN 208649147 U CN208649147 U CN 208649147U
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sludge
circulatory system
support type
pyrohydrolysis
resource
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朱润植
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Plant Style Society Blesses
Woojin Co Ltd
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Plant Style Society Blesses
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Treatment Of Sludge (AREA)

Abstract

A kind of power self-support type sludge resource circulatory system is disclosed.The power self-support type sludge resource circulatory system related in one aspect to of the utility model includes: pyrohydrolysis device, carries out pyrohydrolysis processing to excess sludge；Digestive shelf carries out digestion process to primary sludge and the excess sludge by pyrohydrolysis processing；Sludge dewatering equipment is dehydrated the sludge being discharged from digestive shelf；The sludge being discharged from sludge dewatering equipment is dried in sludge drier；Mixing channel mixes the drying sludge being discharged from sludge drier and the pressing filtering liquid from dewaterer discharge；Nitrogen recyclable device and phosphorus recovery device, from denitrification and phosphorus is removed in the mixture or pressing filtering liquid of dry sludge and pressing filtering liquid, the biogas generated from digestive shelf is supplied as fuel to pyrohydrolysis device and sludge drier.

Description

The power self-support type sludge resource circulatory system
Technical field
The utility model relates to the power self-support type sludge resources of a kind of recycling energy produced by sludge and resource to follow Loop system.
Background technique
In order to handle various sewage, waste water, sanitary sewage and the fecaluria etc. that generate in city, physical chemistry is used parallel Processing method and biochemistry treatment method both methods.In general, physical treatment technology is according to such as in water treatment system Grid → riffler → primary sedimentation tank → biological reaction tank → secondary settling tank → total phosphorus processing equipment → disinfection technique carries out, sludge money The source circulatory system is made of sludge treatment facilities, which the sludge generated from primary sedimentation tank and secondary settling tank is being concentrated It is concentrated in slot, by the digestive shelf for decomposing organic matter, after removing moisture in dewaterer, volume and weight reduction is made Pie.
Finally located by the sludge of above-mentioned Process Production using burning, recycling, directly the methods of landfill, ocean dumping Reason.In existing method for sludge treatment, initial stage depends on landfill, but with forbidding directly filling, ocean dumping amount Abruptly increase, the early 21st century, 70% or more relies on ocean dumping.But with protocol in 1996 relevant to London Dumping Convention Publication, forbid ocean dumping.Therefore, be suggested reduce the amount of sludge generated when sanitary sewage disposal or by it again The necessity utilized.
In addition, including a large amount of phosphorus (P) and nitrogen in the recycle-waters such as pressing filtering liquid generated in the sludge treatment technique (N), thus in the presence of the difficulty for needing separately to remove it.
Utility model content
Technical problem
Therefore, the utility model is to propose to solve the above-mentioned problems, quasi- to provide a kind of power self-support type sludge money The source circulatory system can be wholly converted into resource without carrying out waste treatment to the sludge generated in sewage, wastewater treatment process And it uses.
The other purposes of the utility model will be becomed more clear by embodiment described below.
Technical solution
The power self-support type sludge resource circulatory system that one embodiment of the utility model is related to includes: pyrohydrolysis device, Pyrohydrolysis processing is carried out to excess sludge；Digestive shelf carries out at digestion primary sludge and the excess sludge by pyrohydrolysis processing Reason；Sludge dewatering equipment is dehydrated the sludge being discharged from digestive shelf；Sludge drier, the dirt to being discharged from sludge dewatering equipment Mud is dried；Mixing channel is mixed from the sludge being discharged in sludge drier and the pressing filtering liquid being discharged from sludge dewatering equipment；Nitrogen Recyclable device and phosphorus recovery device, from denitrification and phosphorus is removed in the mixture or pressing filtering liquid of dry sludge and pressing filtering liquid, from digestive shelf The biogas of middle generation is supplied as fuel to pyrohydrolysis device and the sludge drier.
The utility model relates to the power self-support type sludge resource circulatory system can have one or as follows more than it Embodiment.For example, may further include fertilizer production device, the fertilizer production device is put into the nitrogen and/or phosphorus of recycling Other nutrients including potassium, to produce bio-feritlizer.
It further comprise gas storage portion, the gas storage portion stores the biogas generated from digestive shelf, from the gas storage portion to heat The generator of hydrolysis device, sludge drier and personal power generation supplies biogas.
Nitrogen recyclable device is denitrogenated from pressing filtering liquid by first time biological treatment, and phosphorus recovery device can be changed by second Processing carrys out dephosphorization.
Primary sludge puts into digestive shelf by gravity concentration slot, and excess sludge puts into digestion by mechanical thickener Slot can be provided with mechanical mixers in digestive shelf, with raising efficiency.
Beneficial effect
The utility model can provide a kind of power self-support type sludge resource circulatory system, without to sewage, wastewater treatment The sludge generated in the process carries out waste treatment, can be all as resource reutilization.
Detailed description of the invention
Fig. 1 is the figure for showing the power self-support type sludge treating system that the embodiment of the utility model is related to.
Fig. 2 is the figure for showing nitrogen recyclable device shown in Fig. 1.
Fig. 3 is the figure for showing phosphorus recovery device shown in Fig. 1.
Specific embodiment
Hereinafter with reference to multiple attached drawings be described in detail the utility model relates to multiple embodiments, said referring to attached drawing It is unrelated with appended drawing reference in bright process, identical appended drawing reference, and omission pair are assigned for identical or corresponding constituent element This repeated explanation.
Fig. 1 is the figure for showing the power self-support type sludge resource circulatory system 100 that the embodiment of the utility model is related to.
Referring to Fig.1, the power self-support type sludge resource circulatory system 100 that an embodiment of the utility model is related to is being handled After such as sludge of primary sludge 102 and excess sludge 104, thermal power plant is supplied it to, or after remixing with pressing filtering liquid, further Except denitrification (N) and phosphorus (P).The biogas generated in the process can be supplied to pyrohydrolysis device 114 and sludge drier 124. Moreover, the power self-support type sludge resource circulatory system 100 that an embodiment of the utility model is related to produces after by sludge dewatering After recycling phosphorus (P) and nitrogen (N) in the mixture of raw pressing filtering liquid and/or pressing filtering liquid and dry sludge, recycled as fertilizer Raw material.
As described above, the power self-support type sludge resource circulatory system 100 that the present embodiment is related to is in sludge handling process Sludge, biogas and the phosphorus (P) and nitrogen (N) of middle generation are recycled.
The power self-support type sludge resource circulatory system 100 that the present embodiment is related to can be by primary sludge 102 and excess sludge After 104 distinguish, implement pretreatment.Primary sludge 102 can be equivalent to the sludge generated from primary sedimentation tank.Primary sludge 102 is mainly by organic Object is constituted, thus with the feature that biological degradability is high and moisture content is low.Excess sludge 104 can be equivalent to by primary sedimentation tank and life The sludge generated after object reactive tank from secondary settling tank.
Primary sludge 102 can put into digestive shelf 116 by thickener 110, and excess sludge passes through mechanical thickener 112 put into digestive shelf 116.Certainly, the power self-support type sludge resource cyclic system that another embodiment of the utility model is related to System can make primary sludge just put into digestive shelf 116 without thickener 110.In addition, the another embodiment of the utility model relates to And the power self-support type sludge resource circulatory system excess sludge can be made just to put into digestion without mechanical thickener 112 Slot 116.
During primary sludge 102 are concentrated in thickener 110, phosphate etc. can be contained in the supernatant of thickener.Moreover, During excess sludge 104 are concentrated in mechanical thickener 112, phosphate etc. can also be contained in filtrate.In this way, containing Phosphatic supernatant and filtrate supply to phosphorus recovery device 130, so as to recycle phosphorus (P).
Excess sludge 104 is before being put to digestive shelf 116 by 114 hydrolysis process of pyrohydrolysis device.Pyrohydrolysis device 114 be the device for making the methane fermentation of digestive shelf 116 maximize and minimizing sludge yield, in high temperature (for example, about 150 ~200 DEG C) and high pressure (about 600~2500kPa) under the conditions of, hydrolyze the thickened sludge that flows into from mechanical thickener 112.At this In the process, the organic compounds such as protein, polysaccharide, fat, cellulose become to be easy to be utilized in anaerobic digestion simple Organic matter, thus the generation for being equivalent to the methane of biogas can be greatly increased in the digestive shelf 116 as subsequent technique Amount, and by removing the volatile solid (VS) in sludge as far as possible, moisture content can be substantially reduced in dewaterer.Realize commercialization Pyrohydrolysis device 114 have green (Cambi) technique of the health of Norway or Bio Thelys of Kruger company etc..
It can be using the life of such as methane gas generated from digestive shelf 116 for the fuel in pyrohydrolysis device 114 Object gas.
Be concentrated slot 110 concentration primary sludge 102 with by the excess sludge 104 of 114 the pre-heat treatment of pyrohydrolysis device together It puts into digestive shelf 116, is digested the stipulated time.It is digested such as primary sludge 102 and excess sludge 104 of the digestion of slot 116 Sludge be transported to sludge dewatering equipment 120 and be dehydrated.
By the mechanical stirrer (not shown) being arranged in digestive shelf 116, digestive efficiency can be promoted.
During sludge is digested in digestive shelf 116, the methane gas for being equivalent to biogas can produce.Methane gas After body is stored in air accumulator 126, as needed, it can supply to pyrohydrolysis device 114 and sludge drier 124.Pyrohydrolysis The biogas generated from digestive shelf 116 is used as fuel by device 114 and sludge drier 124, may not need additional additional combustion Material.
The sludge being discharged from digestive shelf 116 removes moisture by sludge dewatering equipment 120.Sludge dewatering equipment 120, which is equivalent to, to be passed through The moisture content of sludge is reduced to realize and solidify to make it easier to the device transferred and handled.Sludge dewatering equipment 120 can pass through compression The sludge for mixing and being aggregated with agglutinant (polymer: polymer) solidifies to realize.It is 50~70% models in the moisture content of sludge Interior viscosity section (glue phase: glue phase) is enclosed, viscosity rises, strong attachment characteristic is presented, thus can be by the aqueous of sludge Rate is maintained at 71% or more.
It is supplied by the sludge that sludge dewatering equipment 120 is dehydrated to sludge drier 124.Also, it is produced from sludge dewatering equipment 120 Raw pressing filtering liquid is supplied to phosphorus recovery device 130 and nitrogen recyclable device 170 or mixing channel 190, to recycle phosphorus (P) and nitrogen (N).
For the purpose that sludge is recycled to the solid fuel for thermal power plant etc., sludge drier 124 is by the moisture of sludge It removes to 10% or less.Therefore, during sludge is burnt as solid fuel, calorific value is made to maximize.Sludge Drying machine 124 can utilize using digestive gas as the burner of fuel in the following way, directly heat air, make sludge Internal moisture gasification.
Sludge drier 124 may include feed hopper, drying machine, hot-blast stove, dust arrester, dry sludge cooler, drying Sludge storage tank, deodorization device and anti-white cigarette device.
Gas used in sludge drier 124 can be using the biogas generated from digestive shelf 116.
It may be used as the solid fuel of thermal power plant etc. by the sludge that sludge drier 124 is dried.
In addition, due to remain in dry sludge 20% or so nitrogen and phosphorus, it is necessary to further remove.Therefore, originally The power self-support type sludge resource circulatory system 100 that embodiment is related to can be further equipped with mixing channel 190, which uses In the drying sludge that mixing is discharged from sludge drier 124 and the pressing filtering liquid from the discharge of dewaterer 120.In mixing channel 190 Portion is mixed dry sludge with pressing filtering liquid by stirring etc. to scale.Also, for mixed drying sludge and filters pressing Liquid is denitrogenated by the way that the first time biological treatment of nitrogen recyclable device 170 is utilized, by phosphorus recovery device 130 is utilized Secondary chemical treatment carrys out dephosphorization.Because dry sludge keeps sterilizing state, very hygienic.
As described above, the recycling of the power self-support type sludge resource circulatory system 100 that the present embodiment is related to remains in dry dirt Nitrogen and phosphorus inside mud so as to recycle nitrogen and phosphorus to the maximum extent, therefore can reduce the pollution concentration of raw water, at the same time may be used Recycle the resource of such as nitrogen and phosphorus.
The power self-support type sludge resource circulatory system 100 that one embodiment of the utility model is related to can be recycled all Drying sludge, biogas and the phosphorus and nitrogen occurred in sludge handling process.That is, the sludge being eventually processed is dry by drying machine It is dry, solid fuel can be used as in thermal power plant etc..Moreover, the digestive gas generated from digestive shelf supplies in processing sludge process To pyrohydrolysis device 114 and sludge drier 124 and it is used as fuel.Also, the pressing filtering liquid generated in sludge dehydration process And the mixture of pressing filtering liquid and dry sludge is recovered phosphorus by phosphorus recovery device 130, and is returned by nitrogen recyclable device 170 Receive nitrogen.The recycling nitrogen and phosphorus being recovered is fertilizer material.
Phosphorus recovery device 130 and nitrogen recyclable device 170 can respectively be connect with fertilizer production device 180.Fertilizer production device 180 can as needed for the phosphorus that is discharged from phosphorus recovery device 130 or the nitrogen addition such as potassium being discharged from nitrogen recyclable device 170, The nutrient of Calcium Magnesium Sulphur etc., so as to produce bio-feritlizer.
Fig. 2 is the figure for showing nitrogen recyclable device 170 shown in FIG. 1.
Referring to Fig. 2, nitrogen recyclable device 170 includes: reserve tank 171, for store from the pressing filtering liquid of the discharge of dewaterer 120 or The mixture of the drying sludge and pressing filtering liquid that are discharged from mixing channel 190；Anaerobic groove 172 utilizes the pressure that will be flowed into from reserve tank The nitrite or nitrate of filtrate or dry sludge is used as the denitrification microorganism of electron acceptor, by the nitrite or nitrate It is converted into nitrogen (N2), carries out denitrogenation；Aeration tank 173 will be flowed by the effect of Nitrosomas or Nitromonas from anaerobic groove 172 Ammonia (NH in the pressing filtering liquid entered3) it is oxidized to nitrite or nitrate, it is returned to anaerobic groove 172；Heat exchanger 174, will Temperature inside aeration tank 173 is maintained at 34~40 DEG C, to promote the growth of Nitrosomas, and inhibits the growth of Nitromonas；It is heavy Shallow lake slot is separated by solid-liquid separation the pressing filtering liquid flowed into from aeration tank 173, solid matter is removed from pressing filtering liquid.
Fig. 3 is the figure for showing phosphorus recovery device 130 shown in Fig. 1.
Referring to Fig. 3, phosphorus recovery device 130 adjusts liquid throw-in part by crystallization reserve tank 136, crystallization reactive tank 150, pH 132 and crystallization drug throw-in part 134 constitute.
As the method from pressing filtering liquid recycling phosphorus, ammonium magnesium phosphate (MAP) method for manufacturing insoluble phosphate and being recycled It is not only economical but also efficient with calcium hydroxy phosphate (HAP) method.
Ammonium magnesium phosphate (MAP) is commonly called as guanite (struvite), and the chemical formula of crystallization is MgNH4PO4·6H2O.Its physics Property is as follows: specific gravity 1.7 is thermally decomposed, and solubility in water is low, but has highly dissoluble in an acidic solution, and It is insoluble in alkaline solution.Ammonium magnesium phosphate (MAP) is made of 1 mole of ammonia and 1 mole of phosphoric acid, therefore being can be same When expeditiously remove phosphatic method.
Ammonium magnesium phosphate is formed on the anaerobic digestion slot flowline of existing sewage treatment plant more.This is because coming from characteristic It says the ammoniacal nitrogen and phosphate that the anaerobic digestion solution of anaerobic digestion slot contains high concentration and keeps the pH for being suitble to generate crystallization. Therefore, for the ammoniacal nitrogen containing high concentration and phosphatic waste water, the phosphoric acid of phosphorus and nitrogen can be recycled and utilized simultaneously Ammonium magnesium is one of most suitable crystallization method.
Calcium hydroxy phosphate is made of 5 moles of calcium and 3 moles of phosphate, chemical formula Ca5(PO4)3(OH), crystallization belongs to In hexagonal crystal system, with hexa-prism, hexagonal plate output.Specific gravity in physical property is 3.16, is the main component of rock phosphate in powder, It is thus the high mineral of economic value.
Crystallization reserve tank 136 has: flowing into valve 138；Valve 146 is flowed out, makes the recycle-water of storage to crystallization reactive tank 150 outflows, the recycle-water keep the pH for being suitble to generate crystallization.Moreover, crystallization reserve tank 136 has: blender 142, For adjusting the pH of recycle-water and preventing from precipitating；PH measuring instrument 140, for adjusting the pH of the recycle-water flowed into；Limnimeter 144, The water level of crystallization reserve tank 136 can be grasped.
Crystallization reserve tank 136 temporarily stores the pressing filtering liquid generated from sludge dewatering equipment 120, and is thrown using liquid is adjusted from pH The pH for entering the investment of portion 132 adjusts liquid, keeps optimal pH, so that crystallization phenomenon occurs in crystallization reactive tank 150.
Crystallization reactive tank 150 includes: to flow into valve 151, flows into recycle-water from crystallization reserve tank 136；Valve 158 is flowed out, Make through phosphate crystalization except the recycle-water of dephosphorization is returned to water treatment technology.Crystallizing reactive tank 150 includes: limnimeter 156, internal recycle-water water level can be grasped；Time regulator (not shown) adjusts the crystallization phenomenon reaction time.Moreover, Crystallization reactive tank 150 has: blender 152, is stirred to crystallize phenomenon from the crystallization investment of drug throw-in part 134 Drug；Thermometer 154 measures internal water temperature.
Recycle-water forms phosphate crystalline by stirring appropriate in crystallization reactive tank 150.Phosphate crystal The specific gravity of body is 1.7~3.16, is the main component of rock phosphate in powder, thus is the high mineral of economic value, being capable of recycling and reusing.
Crystallization reactive tank 150 is preferably shaped to quadrangle or circle, generallys use concrete structure, or can benefit With stabilization material, which has corrosion resistance, durability by not formed by the material of acid or caustic corrosion.It can The capacity for crystallizing reactive tank 150 to be formed as, it can be ensured that the residence time of the recycle-water flowed on a small quantity reaches 20 minutes Left and right.
Phosphorus recovery device 130 includes: that pH adjusts liquid throw-in part 132, is adjusted for supplying pH to crystallization reserve tank 136 Liquid, to adjust optimal pH range；Drug throw-in part 134 is crystallized, is used for slightly solubility phosphoric acid to the crystallization supply of reactive tank 150 Magnesium or calcium of salt crystallization etc..
PH, which adjusts liquid throw-in part 132, to be had and can adjust to crystallization reserve tank 136 and the crystallization supply of reactive tank 150 pH The injection device of liquid will make it that can run according to field condition when even if without using crystallization reserve tank 136.That is, according to feelings Condition can also be not provided with crystallization reserve tank 136, and only have crystallization reactive tank 150, and put into pH to it and adjust liquid.
The solidification or precipitating of drug in order to prevent, pH adjusts liquid throw-in part 132 and crystallization drug throw-in part 134 can be with Has stirring facility.It should by the injection facility that pH adjusts the drug that liquid throw-in part 132 and crystallization drug throw-in part 134 are constituted Can easily be accommodated injection rate and have reliability, and need in the appropriate range can freely regulated such as drug quantitatively inject The chemicals feeding facilities of pump etc..
Above-mentioned is the explanation carried out referring to the embodiments of the present invention, it will be appreciated that those skilled in the art exist It is more without departing from that can be carried out to the utility model in the range of the thought of the utility model documented by claims and field Kind modifications and changes.

Claims (5)

1. a kind of power self-support type sludge resource circulatory system characterized by comprising
Pyrohydrolysis device carries out pyrohydrolysis processing to excess sludge；
Digestive shelf carries out digestion process to primary sludge and the excess sludge by pyrohydrolysis processing；
Sludge dewatering equipment is dehydrated the sludge being discharged from the digestive shelf；
The sludge being discharged from the sludge dewatering equipment is dried in sludge drier；
Mixing channel mixes the drying sludge being discharged from the sludge drier and the pressing filtering liquid from dewaterer discharge；
Nitrogen recyclable device and phosphorus recovery device remove denitrification from the mixture or pressing filtering liquid of the dry sludge and the pressing filtering liquid With phosphorus,
The biogas generated from the digestive shelf is supplied as fuel to the pyrohydrolysis device and the sludge drier.
2. the power self-support type sludge resource circulatory system according to claim 1, which is characterized in that
It further comprise fertilizer production device, the fertilizer production device is to the nitrogen and/or phosphorus of recycling investment comprising including potassium Other nutrients, to produce bio-feritlizer.
3. the power self-support type sludge resource circulatory system according to claim 1, which is characterized in that
It further comprise gas storage portion, the gas storage portion stores the biogas generated from the digestive shelf,
It is supplied from the gas storage portion to the generator of the pyrohydrolysis device, the sludge drier and personal power generation Biogas.
4. the power self-support type sludge resource circulatory system according to claim 1, which is characterized in that
The nitrogen recyclable device is denitrogenated from pressing filtering liquid by first time biological treatment, and the phosphorus recovery device passes through second Chemical treatment carrys out dephosphorization.
5. the power self-support type sludge resource circulatory system according to claim 1, which is characterized in that
Primary sludge puts into the digestive shelf by gravity concentration slot, and excess sludge puts into described disappear by mechanical thickener Change slot,
Mechanical mixers are set in the digestive shelf, with raising efficiency.
CN201821093776.2U 2018-07-11 2018-07-11 The power self-support type sludge resource circulatory system Active CN208649147U (en)

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CN201821093776.2U CN208649147U (en) 2018-07-11 2018-07-11 The power self-support type sludge resource circulatory system

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Application Number Priority Date Filing Date Title
CN201821093776.2U CN208649147U (en) 2018-07-11 2018-07-11 The power self-support type sludge resource circulatory system

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