CN108911462B - Sewage precipitation drying equipment - Google Patents
Sewage precipitation drying equipment Download PDFInfo
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- CN108911462B CN108911462B CN201810673493.3A CN201810673493A CN108911462B CN 108911462 B CN108911462 B CN 108911462B CN 201810673493 A CN201810673493 A CN 201810673493A CN 108911462 B CN108911462 B CN 108911462B
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- precipitation
- sewage
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- sludge
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- 238000001556 precipitation Methods 0.000 title claims abstract description 74
- 239000010865 sewage Substances 0.000 title claims abstract description 52
- 238000001035 drying Methods 0.000 title claims abstract description 33
- 239000010802 sludge Substances 0.000 claims abstract description 57
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- 230000000903 blocking effect Effects 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000004888 barrier function Effects 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 239000013049 sediment Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Images
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides sewage precipitation drying equipment, belongs to the technical field of sewage treatment, and solves the technical problems of low sludge separation efficiency and the like in the prior art. This sewage deposits drying equipment includes a plurality of precipitation units and supplies the inlet tube that mud got into, precipitation unit is vertical inline and precipitation unit bottom is provided with the ooff valve that supplies mud to discharge into the adjacent precipitation unit in below, precipitation unit top sets up the barrier region, it has a plurality of through holes that supply sewage to flow into the precipitation unit inside to distribute on the barrier region, the top of precipitation unit lateral wall is provided with the overflow hole that supplies the rivers to flow. The invention can directly break up the sludge in the sewage transfer process, is convenient for sedimentation and is also convenient for recovering substances in the sludge.
Description
Technical Field
The invention belongs to the field of sewage treatment, and relates to sewage precipitation drying equipment.
Background
Many chemical enterprises such as papermaking and the like can inevitably generate a lot of industrial sludge in the production process, the sludge is directly discharged to pollute the environment, and substances such as water resources and heavy metals in the sludge are wasted, so that the sludge recovery is a necessary production link of many enterprises at present.
Chinese patent application literature (publication number: CN 106582107A; publication date: 2017.4.26) discloses a multistage sedimentation tank for sludge water, which comprises a plurality of sedimentation tanks which are continuously arranged, and the upper parts of the adjacent sedimentation tanks are communicated. Wherein be provided with the filter-pressing board in the sedimentation tank, extrude the mud in the sedimentation tank through the extrusion of filter-pressing board and then, shorten the filtration settling time of mud.
However, in the above technical scheme, when the sludge at the bottom of the sedimentation tank is discharged, the sludge still has high water content, the whole sludge is seriously agglomerated, and a lot of water-soluble substances are wrapped inside the sludge, so that the sludge amount is large.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides sewage precipitation drying equipment, which aims to solve the technical problems that: how to separate and recycle the resources in the sludge with high efficiency.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a sewage sedimentation drying equipment, includes a plurality of sedimentation units and supplies the inlet tube that mud got into, its characterized in that, sedimentation unit is vertical inline and sedimentation unit bottom is provided with the ooff valve that supplies mud to discharge into adjacent sedimentation unit in below, sedimentation unit top sets up the barrier portion, it has a plurality of through holes that supply sewage inflow sedimentation unit inside to distribute on the barrier portion, the top of sedimentation unit lateral wall is provided with the overflow hole that supplies the rivers to flow.
The sedimentation unit can deposit mud, will deposit the vertical setting of unit, and top sedimentation unit is after deposiing like this, and bottom mud can directly enter into next sedimentation unit and deposit, can improve the drying efficiency of mud like this greatly, improves the recovery efficiency to water resource in the mud. And when the sewage above enters the next precipitation unit, the sewage can impact the blocking part and the through hole due to gravity, so that the lumpy sludge in the sewage can be scattered, and a part of sludge components which are easily dissolved in water are quickly dissolved in the water, thereby reducing the sludge amount and facilitating the recovery of materials such as heavy metals in the sludge. Like this, utilize the structure to the vertical distribution of precipitation unit and through hole, can directly break up mud in sewage transfer process, also be convenient for when being convenient for deposit the recovery to the inside material of mud, simultaneously, this kind of precipitation mode precipitation efficiency is higher, and the mud water content that finally obtains is lower.
In foretell sewage deposits drying equipment, the precipitation unit top is provided with the water turbine that is used for driving the rivers and evenly scatters, and the water turbine of below precipitation unit is located the ooff valve below of top precipitation unit, the part that blocks is the ring and distributes around the water turbine. The water turbine structure can be through rotating toward diffusion all around with rivers, and rivers evenly scatter to annular barrier portion on, then leak down, make full use of barrier portion structure makes its liquid break up comparatively abundant.
In the above sewage precipitation drying device, the blocking part comprises a hollow blocking ring, and through holes are uniformly distributed on the upper surface and the lower surface of the blocking ring. When the sludge passes through the barrier ring, the sludge needs to pass through the through holes of the upper layer and the lower layer, so that the sludge is fully scattered.
In the above sewage precipitation drying apparatus, the upper surface of the stopper ring is inclined downward of the inner side, and the lower surface of the stopper ring is inclined upward of the inner side. The inclined structure can increase the area of the upper surface and the lower surface of the baffle ring in the fixed width, and is convenient for sewage to pass through. And the structure with the inclined upper surface is convenient for the sewage to be folded inwards, so that the sewage is not easy to leak outwards.
In the above sewage precipitation drying device, a plurality of blades for driving water flow to the blocking part are circumferentially distributed on the water turbine, and the switch valve is over against the central position of the water turbine. The ooff valve can just in time let rivers enter into the central point of water turbine and put, and the even scattering of the rivers of being convenient for, the blade can provide centrifugal power for expanding outward of rivers simultaneously, and then for expanding outward of rivers and provide the power of horizontal direction, simultaneously, also can form the impact with the rivers that descend, is convenient for break up to rivers.
In foretell sewage deposit drying equipment, precipitation unit semicircular structure, precipitation unit's lateral wall is provided with the electromagnetic coil that is used for carrying out the electromagnetism to vibrate sewage. Semicircular structure is convenient for the mud in the sewage to concentrate and deposits the minimum point position in the bottom, and the electromagnetic ring can provide for sewage and disinfect, break loose etc. compares in the structure of water turbine and stop part, and the electromagnetic ring utilizes the electromagnetic force and then makes the inside decomposition of mud more thorough, and heavier composition sinks more easily, improves precipitation efficiency.
In foretell sewage deposit drying equipment, precipitation unit outside circumference is provided with the overflow chamber, and the quantity of overflow hole is a plurality of and distributes along precipitation unit circumference, overflow hole and overflow chamber intercommunication, be connected with the drainage branch pipe on the overflow chamber, the drainage branch pipe is the slope form, and all drainage branch pipes all connect on the drainage is responsible for. The structure that overflow hole circumference distributes can be convenient for the supernatant in the precipitation unit to flow into the overflow intracavity, then in drainage main pipe is collected through drainage branch pipe, supplies people to retrieve, and this kind of structure clear solution exhaust rate is very fast.
In foretell sewage deposit drying equipment, sewage deposit drying equipment is still including the heat transfer area that is used for dry mud, is located to be connected with on the precipitation unit of the lowest portion and carries mud to the blow off pipe in heat transfer area. The lowest position mud water content is minimum, directly extracts the mud of bottommost precipitation unit, through the stoving of hot transmission band, can be comparatively quick obtain dry mud.
In the above sewage precipitation drying apparatus, the number of the precipitation units is 5 to 8. In the process of sludge treatment, the sludge can be subjected to different amounts of sedimentation according to different sludge, and the water content of the sludge can be basically reduced to be lower after 5-8 sedimentation units are subjected to sedimentation.
In foretell sewage deposit drying equipment, sewage deposit drying equipment still includes sludge impoundment and clear solution pond, inlet tube and sludge impoundment intercommunication, the drainage is responsible for and is linked together with the clear solution pond. The sludge tank and the clear liquid tank can be respectively used for collecting sludge and sewage, so that the sewage can enter and clear liquid can be recovered conveniently.
Compared with the prior art, the invention has the following advantages:
1. through the vertically distributed sedimentation units, the sedimentation drying efficiency is higher, and the water content of the final sludge can reach a very low level.
2. The sludge is fully scattered in the sedimentation process, so that the components in the sludge can be fully separated out, and the sludge can be conveniently recovered.
Drawings
Fig. 1 is a structural view of the present embodiment.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a top view of the precipitation unit in this embodiment.
In the figure, 1, a precipitation unit; 11. an on-off valve; 12. an electromagnetic coil; 21. a water turbine; 211. a blade; 22. a blocking portion; 221. a blocking ring; 222. a through hole; 31. an overflow aperture; 32. an overflow chamber; 33. a drain branch pipe; 34. a main drainage pipe; 41. a thermal transfer belt; 411. a blow-off pipe; 42. a sludge tank; 421. a water inlet pipe; 43. and a clear liquid pool.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in figure 1, a sewage sedimentation drying equipment, including precipitation unit 1, heat transfer area 41, sludge impoundment 42, clear liquid pond 43, precipitation unit 1 quantity is a plurality of and vertical setting, is connected with the inlet tube 421 that is used for transmitting mud on the sludge impoundment 42, makes the mud of sludge impoundment 42 transmit in inlet tube 421 through the pump machine, enters into the precipitation unit 1 that is located the top, and the precipitation unit 1 of top discharges the mud of sediment into the precipitation unit 1 that is located the below. The lowest sedimentation unit 1 is connected with a drain pipe 411, and the drain pipe 411 can draw out the sludge in the lowest sedimentation unit 1 and make the sludge enter the heat transfer belt 41 for drying.
The sedimentation unit 1 is in a semicircular structure, the bottom of the sedimentation unit 1 is provided with a switch valve 11 for discharging sludge, and the switch valve 11 can be opened and closed at regular time through electromagnetic control.
As shown in fig. 2 and fig. 3, a rotatable water turbine 21 is disposed at a central position of the top of the precipitation unit 1, a section of the water turbine 21 in the vertical direction is in a semicircular structure, and a plurality of blades 211 for driving water to flow to the blocking portion 22 are circumferentially distributed on the water turbine 21. The blades 211 on the water turbine 21 have a two-layer structure in total, the density of the blades 211 on the upper layer is greater than that of the blades 211 on the lower side, and each blade 211 is of an arc-shaped structure. During the rotation of the water turbine 21, the water flow firstly enters the upper blades 211, the upper blades 211 disperse the water flow to enable the water flow to enter the lower blades 211, and the lower blades 211 further disperse the water flow in the rotation process to be uniformly distributed on the blocking ring 221. The dense structure of upper blade 211 can let rivers and blade 211's contact increase, and then also can break up the mud in the rivers through blade 211. The arc-shaped structure of the blades 211 facilitates the shaking of the water flow, thereby repeatedly scattering the water flow.
The on-off valve 11 of the upper precipitation unit 1 is located opposite to the center of the water turbine 21. The water turbine 21 is used for receiving the sludge released by the upper sedimentation unit 1, can bear the impact of the sludge, accelerates the sludge through rotation, and enables the sludge to be uniformly thrown around.
As shown in fig. 3, a blocking portion 22 is further disposed around the water turbine 21, the blocking portion 22 includes a hollow blocking ring 221, and through holes 222 are distributed on both upper and lower surfaces of the blocking ring 221. The upper surface of the blocking ring 221 is inclined downward toward the inside, and the lower surface of the blocking ring 221 is inclined upward toward the inside. The blocking portion 22 can receive the water flow from the water turbine 21, and allow the sewage to leak downward through the inclined through hole 222, and in the process of downward leakage, the large particles in the sludge are impacted and dispersed.
The lateral wall that deposits unit 1 is provided with and is used for carrying out the electromagnetic ring 12 that the electromagnetism was vibrate to sewage, and electromagnetic ring 12 can be toward the sewage release electromagnetic force in depositing unit 1, and then can provide for sewage and disinfect, break loose etc. compares in the structure of water turbine 21 and stop part 22, and electromagnetic ring 12 utilizes the electromagnetic force and then makes the inside decomposition of mud more thorough, and heavier composition sinks more easily, improves precipitation efficiency.
As shown in fig. 1 and 2, the top position of the side wall of the precipitation unit 1 is provided with an overflow hole 31 for the clear liquid to flow out, the overflow hole 31 horizontally penetrates through the side wall of the precipitation unit 1, an overflow cavity 32 is arranged on the outer wall of the precipitation unit 1, the number of the overflow holes 31 is multiple and is distributed along the circumferential direction of the precipitation unit 1, the overflow holes 31 are communicated with the overflow cavity 32, the overflow cavity 32 is connected with a branch drain pipe 33, the branch drain pipe 33 is inclined, and all the branch drain pipes 33 are all connected to a main drain pipe 34. After the sludge enters the sedimentation unit 1, the part with larger specific gravity in the sludge sinks through the scattering of the blocking part 22, the supernatant liquid flows out from the overflow hole 31 and enters the overflow cavity 32, the supernatant liquid in the overflow cavity 32 enters the main drainage pipe 34 through the branch drainage pipe 33, each sedimentation unit 1 is connected with one branch drainage pipe 33, the branch drainage pipes 33 are obliquely arranged, the main drainage pipe 34 is vertically arranged, and the overflowed supernatant liquid can enter the clear liquid pool 43 along the main drainage pipe 34.
The thermal transfer belt 41 comprises a transfer belt, an air heater is arranged above the transfer belt and can dry and process sludge on the transfer belt, and finally the transfer belt transfers the sludge to a cutting and packaging processing position for final treatment.
Sludge is at the in-process of processing, and the regular switching that carries on of ooff valve 11, and in sludge arrived the precipitation unit 1 of below through the sediment of one deck from the precipitation unit 1 of top, through the sediment of each deck, sludge water content in the precipitation unit 1 of bottom is lower, transmits to heat transmission area 41 through blow off pipe 411 at last, carries out final drying, and it is higher to dry like this get up efficiency, and the power consumption is also less.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although 1, precipitation unit is used more herein; 11. an on-off valve; 12. an electromagnetic coil; 21. a water turbine; 211. a blade; 22. a blocking portion; 211. a blocking ring; 222. a through hole; 31. an overflow aperture; 32. an overflow chamber; 33. a drain branch pipe; 34. a main drainage pipe; 41. a thermal transfer belt; 411. a blow-off pipe; 42. a sludge tank; 421. a water inlet pipe; 43. a clear liquid bath, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (9)
1. The utility model provides a sewage sedimentation drying equipment, includes precipitation unit (1) and supplies inlet tube (421) that mud got into, precipitation unit (1) is provided with overflow hole (31) that supply the clear liquid to flow out, the quantity of precipitation unit (1) is a plurality ofly, and precipitation unit (1) is vertical inline, inlet tube (421) connection is located the precipitation unit (1) of the top, inlet tube (421) have the discharge port that supplies sewage to discharge, and precipitation unit (1) bottom is provided with and supplies mud to discharge into ooze ooff valve (11) of the adjacent precipitation unit (1) in below, its characterized in that, precipitation unit (1) top is provided with the portion of blockking (22) that are used for blockking sewage and is used for driving water turbine (21) that the rivers evenly scatter, and water turbine (21) of below precipitation unit (1) are located the ooff valve (11) below of top precipitation unit (1), the blocking part (22) is annular and is distributed around the water turbine (21), the discharge port of the water inlet pipe (421) is positioned above the water turbine (21), and a plurality of through holes (222) for sewage to flow into the settling unit (1) are distributed on the blocking part (22).
2. The sewage precipitation drying apparatus of claim 1, wherein the blocking portion (22) comprises a hollow blocking ring (221), and through-holes (222) are distributed on both upper and lower surfaces of the blocking ring (221).
3. The wastewater precipitation drying apparatus according to claim 2, wherein an upper surface of said blocking ring (221) is inclined downward and inward, and a lower surface of said blocking ring (221) is inclined upward and inward.
4. The sewage precipitation drying apparatus according to claim 3, wherein a plurality of blades (211) for driving water to flow to the blocking portion (22) are circumferentially distributed on the water turbine (21), and the on-off valve (11) is opposite to the central position of the water turbine (21).
5. The sewage precipitation drying apparatus according to claim 1, wherein the precipitation unit (1) has a semicircular structure, and the side wall of the precipitation unit (1) is provided with an electromagnetic coil (12) for electromagnetically oscillating the sewage.
6. The sewage precipitation drying device according to claim 1, wherein an overflow cavity (32) is circumferentially arranged outside the precipitation unit (1), a plurality of overflow holes (31) are circumferentially distributed along the precipitation unit (1), the overflow holes (31) are communicated with the overflow cavity (32), a branch drain pipe (33) is connected to the overflow cavity (32), the branch drain pipe (33) is inclined, and all the branch drain pipes (33) are connected to a main drain pipe (34).
7. The sewage precipitation drying apparatus of claim 1, further comprising a heat transfer belt (41) for drying the sludge, wherein a drain pipe (411) for transferring the sludge to the heat transfer belt (41) is connected to the precipitation unit (1) located at the lowest portion.
8. The sewage precipitation drying apparatus of claim 1, wherein the number of precipitation units (1) is 5 to 8.
9. The sewage precipitation drying apparatus of claim 6, further comprising a sludge tank (42) and a clear liquid tank (43), wherein the water inlet pipe (421) is communicated with the sludge tank (42), and the main drain pipe (34) is communicated with the clear liquid tank (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810673493.3A CN108911462B (en) | 2018-06-26 | 2018-06-26 | Sewage precipitation drying equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810673493.3A CN108911462B (en) | 2018-06-26 | 2018-06-26 | Sewage precipitation drying equipment |
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| CN108911462A CN108911462A (en) | 2018-11-30 |
| CN108911462B true CN108911462B (en) | 2021-07-09 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206688296U (en) * | 2017-04-11 | 2017-12-01 | 王浩宇 | A kind of sedimentation basin for sewage disposal |
| CN108126375A (en) * | 2018-01-23 | 2018-06-08 | 北京澳柯清洁煤气工程技术有限公司 | Slag-liquid separation device and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03232507A (en) * | 1990-02-08 | 1991-10-16 | Heriosu:Kk | Filter piece provided with spacer |
| CN1482081A (en) * | 2002-09-12 | 2004-03-17 | 上海西科水科学环保技术有限公司 | Multi-stage separation and concentration apparatus for sewage |
| CN102701710B (en) * | 2012-06-03 | 2013-07-17 | 安庆市隆鑫建材有限公司 | Environment-friendly brick taking urban domestic sludge as raw material, and production method thereof |
| CN105236704B (en) * | 2015-09-30 | 2017-06-20 | 浙江嘉丽再生资源有限责任公司 | A kind of sludge condensation separator |
| CN204999790U (en) * | 2015-09-30 | 2016-01-27 | 浙江嘉丽再生资源有限责任公司 | Energy -saving sludge thickening ware |
| CN205516805U (en) * | 2016-02-03 | 2016-08-31 | 安徽乙地生态科技有限公司 | Sewage treatment pipe filters device with shake function |
| CN207227201U (en) * | 2017-09-25 | 2018-04-13 | 云南曲靖呈钢钢铁（集团）有限公司 | A kind of sewage disposal system of smelting iron and steel factory |
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2018
- 2018-06-26 CN CN201810673493.3A patent/CN108911462B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206688296U (en) * | 2017-04-11 | 2017-12-01 | 王浩宇 | A kind of sedimentation basin for sewage disposal |
| CN108126375A (en) * | 2018-01-23 | 2018-06-08 | 北京澳柯清洁煤气工程技术有限公司 | Slag-liquid separation device and method |
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Effective date of registration: 20231115 Address after: The third floor of Building 2, Jingang Qinghong Industrial Park, Jinfeng Electronics Industrial Park, No. 9 Fengde Road, Jiulongpo District, Chongqing, 400050 Patentee after: Fuheng Ecological Environment Technology (Chongqing) Co.,Ltd. Address before: No. 99 Xinfeng Avenue, Jinfeng Town, High tech Zone, Jiulongpo District, Chongqing, 400050 Patentee before: Chongqing Science City Intellectual Property Operation Center Co.,Ltd. Effective date of registration: 20231115 Address after: No. 99 Xinfeng Avenue, Jinfeng Town, High tech Zone, Jiulongpo District, Chongqing, 400050 Patentee after: Chongqing Science City Intellectual Property Operation Center Co.,Ltd. Address before: No.78, jiuhuabei Avenue, Quzhou City, Zhejiang Province Patentee before: QUZHOU University |
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