CN103819071B - sludge drying method and system - Google Patents
sludge drying method and system Download PDFInfo
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- CN103819071B CN103819071B CN201410101276.9A CN201410101276A CN103819071B CN 103819071 B CN103819071 B CN 103819071B CN 201410101276 A CN201410101276 A CN 201410101276A CN 103819071 B CN103819071 B CN 103819071B
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- mummification
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- sludge
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- 238000001035 drying Methods 0.000 title claims abstract description 68
- 239000010802 sludge Substances 0.000 title claims abstract description 55
- 239000000843 powder Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005498 polishing Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000006185 dispersion Substances 0.000 claims abstract description 4
- 230000007306 turnover Effects 0.000 claims description 27
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 5
- 238000002203 pretreatment Methods 0.000 claims description 4
- 239000010801 sewage sludge Substances 0.000 abstract description 8
- 239000007921 spray Substances 0.000 description 10
- 238000013467 fragmentation Methods 0.000 description 7
- 238000006062 fragmentation reaction Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 229910002114 biscuit porcelain Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Present invention is disclosed a kind of sludge drying method and system, it carries out predrying by method of mechanism filter-pressing to the wet mud of water ratio more than 80%, and moisture percentage in sewage sludge is reduced to about 65%; Pre-dewatered sludge is made mud powder through break process, and the dispersion of mud pruinescence is laid on the dividing plate of fine mesh, and multiple-level stack gets up, and is provided with space between mud powder, then carries out air-dry with normal temperature air to mud powder, and moisture percentage in sewage sludge is reduced to about 45%; By stacking air-dry after mud powder send into mummification groove, carrying out turning over throwing with turning over polishing apparatus, carrying out air-dry with normal temperature air to mud powder simultaneously, moisture percentage in sewage sludge is reduced to less than 30%.The mummification air absorbing moisture in mud is discharged and carry out environment protection emission after purifying treatment, and the dry mud after mummification is discharged from mummification groove, disposes further.The present invention, without the need to external heat source, achieves the quick mummification of mud with lower running cost.
Description
Technical field
The present invention relates to a kind of method and system of sludge drying process, particularly a kind of sludge drying method and system collecting mechanism filter-pressing and air-dry mummification.
Background technology
Along with the expansion of sewage disposal scale and the raising of standard, mud generation constantly increases, in addition passing accumulative mud, and Chinese specific resistance to filtration becomes sewage treatment area significant problem.
The moisture percentage in sewage sludge produced from sewage work is very high, and general >80%, first will just be convenient to further disposal by sludge drying.At present, sludge drying main technological route has heat drying, mechanical mummification, air-dry, solar energy desiccation etc.Heat drying construction cost, running cost are too high, and sun power construction cost is high, adaptation region is narrow.Mechanism filter-pressing and air-dry cost low, but mechanical mummification often can only by sludge drying to water ratio about 65%, and air-dry efficiency is lower.Its effect of a kind of technique means of simple application can not be satisfactory.
If mechanical mummification combined with air-dry, utilize mechanical mummification to slough portion of water at a high speed, then by the air-dry major part of sloughing in residue water of low cost, the unification of cost, efficiency can be realized well, reach gratifying quick, low cost mummification effect.
Summary of the invention
The object of the present invention is to provide a kind of sludge drying method and system of low cost, it adopts mechanical mummification and the air-dry mode combined, to realize the normal temperature drying process of mud fast, at low cost, and reach the mummification effect of expection, thus the impact that minimizing mud causes environment.
For achieving the above object, the present invention proposes a kind of sludge drying method, and it comprises the following steps:
S1, makes mud powder by the sludge crushing with certain water ratio;
S2, is dispersed in mud powder on dividing plate, and is positioned over stacking mummification indoor by stacking for described dividing plate to carry out normal temperature stacking air-dry;
S3, by stacking air-dry after mud powder send into turn over drying room mummification groove in carry out normal temperature to turn over throwing air-dry;
S4, by turn over throw air-dry after dry mud discharge from mummification groove; And
S5, carries out environment protection emission by the mummification air absorbing moisture in mud after purifying treatment.
Further, the mud of described certain water ratio is through after dewatered sludge and wet mud mixes, and adopts the method for mechanism filter-pressing to press dry and obtains.
In described S1, the water ratio of mud is 60% ~ 70%.
Normal temperature mummification indoor deployments in described S2, S3 has gas blower, to dry up mud air blast from different directions.
The present invention also proposes a kind of sludge drying system, comprise sludge pretreatment device, decker, stacking mummification room, turn over drying room and mummification air cleaning unit, described stacking mummification indoor are provided with gas blower, described drying indoor of turning over are provided with mummification groove, turn over polishing apparatus and gas blower, the mud with certain water ratio is prepared into mud powder and is sprinkling upon on described decker by described sludge pretreatment device, the dividing plate being furnished with mud powder carries out stacking by described decker, described stacking mummification room is for carrying out air-dry process to the mud on decker, described drying room of turning over is for turning over throwing drying and other treatment to the mud after air-dry process, the normal temperature mummification air of described gas blower for providing certain speed to flow, described mummification air cleaning unit is used for carrying out purifying treatment to from stacking mummification room and the mummification air turning over the discharge of drying room.
Further, described sludge pretreatment device comprises crusher, pulverizer and duster, predry sludge crushing is become little clod by described crusher, and little clod is ground into small particle size mud powder by pulverizer further, and the dispersion of mud powder is sowed on described dividing plate by duster.
For the wet mud that water ratio is higher, described sludge pretreatment device also comprises machinery and press dry device, for pressing dry pre-treatment to wet mud.
As optimal way, described in turn over polishing apparatus and be installed in described mummification groove, and to move back and forth along described mummification groove, to turn over throwing to the mud powder in mummification groove.
Another kind of preferred mode, described mummification groove is rotary type mummification groove, is provided with and turns over throwing spiral in mummification groove, turns over to throw spiral and be fixed on mummification groove inwall, and mud powder rotates along with mummification groove and turned over and throw spiral and take eminence to and fall realization and stir.
Described decker preferably adopts mesh to be less than the gauze in mud powder footpath as dividing plate, and gauze is by skeletal support.
Described mummification air cleaning unit is the mummification air cleaning unit being arranged at described anhydration system top, and described mummification air cleaning unit comprises spray piping and is arranged at the atomizer on spray piping.
Described stacking mummification room and the mummification air turning over drying indoor are introduced in described mummification air cleaning unit by induced draft fan.
Sludge drying method of the present invention adopts mechanism filter-pressing, stacking normal temperature is air-dry and turn over the method for throwing the mummification of normal temperature wind syllogic and combining, it carries out predrying by mechanism filter-pressing or mechanical means such as machinery mixing dewatered sludge and wet mud etc. to the wet mud of water ratio more than 80%, and moisture percentage in sewage sludge is reduced to about 65%; Pre-dewatered sludge is made mud powder after the process such as fragmentation, pulverizing, the dispersion of mud pruinescence is laid on the dividing plate of fine mesh, and multiple-level stack gets up, and is provided with space between mud powder, carry out air-dry with normal temperature air to mud powder again, moisture percentage in sewage sludge is reduced to about 45%; By stacking air-dry after mud powder send into mummification groove, carry out turning over throwing with turning over polishing apparatus, carry out air-dry with normal temperature air to mud powder simultaneously, moisture percentage in sewage sludge is reduced to less than 30%, minimumly can reach 10%, thus realize the drying process of mud rapidly, and reach the lower mummification effect of water ratio in mud.
Different according to the water ratio of wet mud supplied materials, the present invention can select to carry out different pre-treatment step, as for the higher mud (if water ratio is higher than 80%) of water ratio, then adopt after mixing with back-mixing dewatered sludge and carry out mechanism filter-pressing, its water ratio is made to reach 60%-70%, wet mud after press filtration forms sludge cake, and then carries out the step such as fragmentation, pulverizing, formed the less laggard windrow of mud powder of particle diameter fold air-dry and turn over throw air-dry.For the mud (if water ratio is at 60%-70%) that water ratio is lower, then directly can carry out the pre-treatment of fragmentation, pulverizing, form the laggard windrow of mud powder and fold air-dry and turn over the process dried.
Compared with prior art, sludge drying method of the present invention and system have: sludge drying, without external heat source, is about 10% to water ratio by (1); (2) energy contained of mud fully retains, and can realize recycling further; (3) wet mud can be processed, also can process other wet stocks, particularly drying rate be there is no to the wet stock of particular requirement, as wet wood chip, corn cob slag, the dregs of a decoction, manioc waste, bagasse, mud coal, mineral aggregate etc.; (4) optimize mechanism filter-pressing, stacking mummification and turn over the respective feature of drying, achieving the mummification effect than single drying method mummification speed faster and Geng Jia.
Accompanying drawing explanation
Fig. 1 is the schema of sludge drying method of the present invention;
Fig. 2 is the structural representation of the sludge drying system that first preferred embodiment of the invention discloses, and wherein turns over mummification groove in drying room and adopts fixed mummification groove;
Fig. 3 is the structural representation of the sludge drying system that second preferred embodiment of the invention discloses, and the mummification groove wherein turned in drying room adopts rotary type mummification groove.
Element numbers in figure
E Foerderanlage 1-1,1-2,1-3,1-4,1-5, stirring mixer 2, mechanism filter-pressing device 3, crusher 4, pulverizer 5, duster 6, dividing plate 7 with mesh, mummification air cleaning unit 8, stacking mummification room 9, horizontal gas blower 10,15, longitudinal gas blower 11,16, induced draft fan 12, the stacking mud 13 opened by baffle for separating, turns over drying room 14, turns over polishing apparatus 17, mummification groove 18, induced draft fan 19, turns over and throws spiral 20.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme of the embodiment of the present invention.
Shown in composition graphs 1, Fig. 2, disclosed sludge drying method, it adopts machinery to press dry, stacking air-dry and turn over the mummification that the drying method throwing air-dry syllogic carries out wet mud, namely after first dewatered sludge powder and wet mud being mixed, carry out preliminary mummification through mechanism filter-pressing, more stacking air-dry after being pulverized by mud cake, finally semi-dry sludge powder put into mummification groove carry out turning over throw air-dry.In conjunction with the sludge drying system that first preferred embodiment of the invention discloses, the process of sludge drying specifically comprises:
The first, with e Foerderanlage 1-1 dewatered sludge powder and wet mud sent in stirring mixer 2 and mix.The water content requirement <25% of dewatered sludge powder, the ratio of dry mud and wet mud is generally 1: 1.5 ~ 1: 6.5, and dewatered sludge powder is synchronous with wet mud to be inputted in proportion and stirs evenly.
The second, with e Foerderanlage 1-2, the mud of mixing is sent into mechanism filter-pressing device 3 and carry out press filtration.The preferred multidirectional directly pressing type mechanism filter-pressing of mode of press filtration, without the need to mud dilution, pumping.Moisture percentage in sewage sludge after press filtration reaches 60% ~ 70%, and preferably 65%.
3rd, with e Foerderanlage 1-3, the sludge cake after press filtration is sent into crusher 4 and carry out fragmentation.The broken preferred shearing fragmentation of mode, the mud size after fragmentation in 5 ~ 30mm × 5 ~ 30mm.
4th, with e Foerderanlage 1-4, the mud granule after fragmentation is sent into pulverizer 5 and pulverize.The mode pulverized preferably is twined formula and pulverizes, and the mud after pulverizing forms mud powder, and its particle diameter, at 0.1-3mm, also comprises the mud grain that some particle diameters are larger in this mud powder.
5th, with e Foerderanlage 1-5, the mud powder after pulverizing is sent into duster 6, loose powder machine 6 preferred template formula duster.By duster 6, mud powder is disperseed to be laid on the dividing plate 7 of fine mesh, between mud powder, there is space, dividing plate 7 preferably adopts mesh to be less than the gauze in mud powder footpath as dividing plate, gauze is strengthened by skeleton, gauze with skeleton is that zig-zag type is by spaced apart for the layering of mud powder continuously, one deck mud powder one deck gauze, is beneficial to ventilate.For example, stacking mud bisque height is 3cm, and the stacking number of plies is 20 layers.
6th, the multilayer insulating panel 7 heap poststack installing mud powder is sent in stacking normal temperature air mummification room (lower be called for short stacking mummification room) 9 windrow of going forward side by side and is folded air-dry process.Horizontal gas blower 10, longitudinal gas blower 11 is provided with in stacking mummification room 9, this horizontal gas blower 10 and longitudinal gas blower 11 carry out air-dry for introducing fresh normal temperature air in stacking mummification room 9 to mud powder, the wind direction of gas blower can (as 6 hours) be changed often at regular intervals, with make mud powder evenly, mummification fast.
7th, after stacking air-dry certain hour (as 12 hours), semi-dry sludge powder on dividing plate 7 is sent in the fixed mummification groove 18 turning over and throw in normal temperature air mummification room (lower abbreviation turns over drying room) 14, turn in drying room 14 and be also provided with horizontal gas blower 15, longitudinal gas blower 16, this horizontal gas blower 15 and longitudinal gas blower 16 are for introducing fresh normal temperature air and to turn over mud powder to turning in drying room 14 and throw air-dry, and the wind direction of gas blower also can at regular intervals as changed for 6 hours.The mud powder turned in polishing apparatus 17 pairs of mummification grooves 18 turns over throwing, is beneficial to mud powder and contacts with air.The described preferred rake of polishing apparatus of turning over turns over polishing apparatus, and it is along the longitudinal to-and-fro movement of mummification groove 18, can stir mud powder like this and can advance the mud powder in mummification groove is all turned over throwing along mummification groove again.The movement velocity of turning over polishing apparatus 17 to turn over throwing one time for good (as 100m/h) within the time of presetting by all mud powder, wait and turn over after drying complete, dry mud powder is scraped from mummification groove 18 by scraper plate.
8th, mummification air cleaning unit 8 is introduced in stacking mummification room 9 and the wet air turned in drying room 14 by induced draft fan 12,19 respectively, carries out purifying treatment.Mummification air cleaning unit 8 comprises the spray pipeline being located at whole anhydration system top, pipeline is provided with atomizer, spray region is divided into Water spray region and alkali lye spray region, and some special mud also increases acid solution spray region to carry out further environmental protection treatment.Because sprinkling system 8 is located at whole anhydration system top, and area is larger, it adopts large volume, heavy caliber, hyperchannel atomizing spray pipeline, with to from stacking mummification room 9 with turn over expellant gas in drying room 14 and carry out the process of multi-faceted spray cleaning effectively, the air after spray cleaning can be arranged outward.
Shown in composition graphs 1, Fig. 3, the sludge drying method that second embodiment of the invention discloses and system, it is substantially identical with device with the mummification step of the first embodiment, the key distinction is, the described mummification groove 18 turned in drying room 14 is rotary type mummification groove 18, turn over polishing apparatus 17 and turn over polishing apparatus for stirring, mummification groove inwall is embedded with turn over and throws spiral 20, stirring is turned over polishing apparatus 17 and is longitudinally arranged on the center of turning over drying room 14.
Through stacking air-dry after semi-dry sludge pruinescence send into and turn in the rotary type mummification groove 18 of 14 li, drying room, mud pruinescence turns over to be thrown spiral 20 and drives and stir up and down, stirs and turns over polishing apparatus 17 stirring mud powder further, make mud powder turn over throwing sufficiently uniformly.Air blast in gas blower 15 pairs of mummification grooves 18, normal temperature air fully contacts mud powder, and it is air-dry that throwing is turned in realization.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (8)
1. a sludge drying method, is characterized in that comprising the following steps:
S1, makes mud powder by the sludge crushing with certain water ratio, and the mud of described certain water ratio is through after dewatered sludge and wet mud mixes, and adopts the method for mechanism filter-pressing to press dry and obtains;
S2, is dispersed in mud powder on dividing plate, and is positioned over stacking mummification indoor by stacking for described dividing plate to carry out normal temperature stacking air-dry;
S3, by stacking air-dry after mud powder send into turn over drying room mummification groove in carry out normal temperature to turn over throwing air-dry;
S4, by turn over throw air-dry after dry mud discharge from mummification groove; And
S5, carries out environment protection emission by the mummification air absorbing moisture in mud after purifying treatment.
2. sludge drying method according to claim 1, is characterized in that: in described S1, the water ratio of mud is 60% ~ 70%.
3. sludge drying method according to claim 1, is characterized in that: the normal temperature in the stacking mummification room of the normal temperature in described S2, S3 turns over drying indoor deployments gas blower, to dry up mud air blast from different directions.
4. a sludge drying system, it is characterized in that, comprise machinery and press dry device, sludge pretreatment device, decker, stacking mummification room, turn over drying room and mummification air cleaning unit, described stacking mummification indoor are provided with gas blower, described drying indoor of turning over are provided with mummification groove, turn over polishing apparatus and gas blower, described machinery press dry device for pressing dry pre-treatment to wet mud, the mud with certain water ratio is prepared into mud powder and is sprinkling upon on described decker by described sludge pretreatment device, the dividing plate being furnished with mud powder carries out stacking by described decker, described stacking mummification room is for carrying out air-dry process to the mud on decker, described drying room of turning over is for turning over throwing drying and other treatment to the mud after air-dry process, the normal temperature mummification air of described gas blower for providing certain speed to flow, described mummification air cleaning unit is used for carrying out purifying treatment to from stacking mummification room and the mummification air turning over the discharge of drying room.
5. sludge drying system according to claim 4, it is characterized in that: described sludge pretreatment device comprises crusher, pulverizer and duster, predry sludge crushing is become little clod by described crusher, little clod is ground into small particle size mud powder by pulverizer further, and the dispersion of mud powder is sowed on described dividing plate by duster.
6. sludge drying system according to claim 4, is characterized in that: described in turn over polishing apparatus and be installed in described mummification groove, and to move back and forth along described mummification groove, to turn over throwing to the mud powder in mummification groove.
7. sludge drying system according to claim 4, is characterized in that: described mummification groove is rotary type mummification groove, turns over polishing apparatus and is fixed on mummification groove, and mud powder rotates along with mummification groove and turned over polishing apparatus and take eminence to and fall realization and stir.
8. sludge drying system according to claim 4, is characterized in that: described decker preferably adopts mesh to be less than the gauze in mud powder footpath as dividing plate, and gauze is by skeletal support.
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| CN201410101276.9A CN103819071B (en) | 2014-03-18 | 2014-03-18 | sludge drying method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410101276.9A CN103819071B (en) | 2014-03-18 | 2014-03-18 | sludge drying method and system |
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| CN103819071A CN103819071A (en) | 2014-05-28 |
| CN103819071B true CN103819071B (en) | 2015-12-09 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104140188B (en) * | 2014-08-04 | 2015-12-09 | 中国计量学院 | Energy-saving sewage sludge method for innocent treatment |
| CN106865947B (en) * | 2017-03-17 | 2020-09-22 | 华南理工大学 | Sludge drying treatment method |
| CN108128993A (en) * | 2017-12-27 | 2018-06-08 | 中运建设控股有限公司 | Formula sludge harmless treatment method is complexed in a kind of dynamic scatter |
| CN108164104A (en) * | 2017-12-27 | 2018-06-15 | 中运建设控股有限公司 | A kind of sludge harmless treatment method |
| CN108178468A (en) * | 2017-12-27 | 2018-06-19 | 中运建设控股有限公司 | A kind of rolling absorption type sludge harmless treatment method |
| CN109237874A (en) * | 2018-08-31 | 2019-01-18 | 广东西屋康达空调有限公司 | A kind of novel drying room |
| CN108955127A (en) * | 2018-08-31 | 2018-12-07 | 广东西屋康达空调有限公司 | Modular heat pump dehumidifying anhydration system |
| CN110330205A (en) * | 2019-07-31 | 2019-10-15 | 洛阳中新能再生能源有限公司 | A kind of operating method of sludge generative fuel production system |
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| CN101671106B (en) * | 2009-09-28 | 2012-11-07 | 广州普得环保设备有限公司 | Method and device for sludge filter cake aerobic air drying |
| CN201517065U (en) * | 2009-09-28 | 2010-06-30 | 广州普得环保设备有限公司 | Sludge filter cake low-temperature air dry device |
| CN203833784U (en) * | 2014-03-18 | 2014-09-17 | 王兢 | Sludge drying system |
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Effective date of registration: 20200615 Address after: 215000 room 205-211, second floor, office building 5, No. 15, Jinpu Road, Suzhou Industrial Park, Jiangsu Province Patentee after: Lianzhi Tongda (Suzhou) Environmental Technology Co.,Ltd. Address before: 215123 Jiangsu Province, Suzhou City Industrial Park Hanlin edge 25 building 1102 room Patentee before: Wang Jing |
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Denomination of invention: Sludge drying method and system Effective date of registration: 20210629 Granted publication date: 20151209 Pledgee: Bank of China Limited Suzhou Wuzhong sub branch Pledgor: Lianzhi Tongda (Suzhou) Environmental Technology Co.,Ltd. Registration number: Y2021320010226 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 |