CN107188377A - A kind of integrated sewage treating apparatus - Google Patents
A kind of integrated sewage treating apparatus Download PDFInfo
- Publication number
- CN107188377A CN107188377A CN201710572353.2A CN201710572353A CN107188377A CN 107188377 A CN107188377 A CN 107188377A CN 201710572353 A CN201710572353 A CN 201710572353A CN 107188377 A CN107188377 A CN 107188377A
- Authority
- CN
- China
- Prior art keywords
- dissolving
- reaction tank
- treating apparatus
- swash plate
- mbr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 5
- 239000010802 sludge Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000084 colloidal system Substances 0.000 abstract description 5
- 239000004519 grease Substances 0.000 abstract description 5
- 239000000725 suspension Substances 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 238000005276 aerator Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000008021 deposition Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
Abstract
A kind of integrated sewage treating apparatus includes reaction tank, MBR films group, suction pump, bubble release, air dissolving system, slag-scraper.Reaction tank length direction is uniformly distributed multiple swash plates, and reaction tank is divided into the aerobic zone above swash plate and the anaerobic zone below swash plate by swash plate.Bubble release is arranged between swash plate and MBR film groups, and is connected with air dissolving system.Ultraviolet lamp is provided with inside dissolving, and inner surface is provided with layer of titanium dioxide film, and ultraviolet is aoxidized and decomposed to dirty Organic substance in water under Titanium Dioxide effect.Suspension in sewage is removed by air-float technology, colloid, the impurity such as grease type provides oxygen for aerobic zone, and MBR film groups are aerated and rinsed as aerator, prevent sludge in MBR films group deposition.MBR film groups are evenly distributed in aerobic zone, and suction pump connects the water side of MBR film groups, and the clear water for handling completion is separated from sewage, and effluent characteristics are high, and effect is good.
Description
Technical field
Invention is related to sewage treatment area, more particularly relates to a kind of integrated sewage treating apparatus.
Background technology
At present, the pollution that industrialization is brought greatly has been degrading the living environment of the mankind.All kinds of water head sites all by
A certain degree of pollution.People are in originally water pretreatment, and municipal wastewater is carried to be required to add air supporting in the process sections such as mark discharge
Process section carries out the suspension in pretreating sewage, colloid, the impurity such as grease type.And mud-water separation is carried out using sedimentation basin, sink
Floor space needed for the pond of shallow lake is larger, and the sedimentation time is long.Mud-water separation is carried out using membrane bioreactor, can not only be greatly reduced
Processing time, moreover it is possible to more effectively intercept sludge, producing water water quality is improved, but conventional membrane bioreactor technique is usually interior
It is placed in Aerobic Pond either split type, is separated with anaerobic reactor, wastes soil.
Need to develop that a kind of simple in construction, floor space is small, more energy efficient, high treating effect for this, with go colloid, grease,
The equipment of the impurity such as suspension, sludge.
The content of the invention
To solve the deficiencies in the prior art, the present invention provides a kind of integrated sewage treating apparatus.
A kind of integrated sewage treating apparatus that the present invention is provided includes reaction tank, MBR films group, suction pump, bubble release
Device, air dissolving system, slag-scraper；The reaction tank length direction is uniformly distributed multiple swash plates, and multiple swash plates are positioned at same
In level height, reaction tank is divided into the aerobic zone above swash plate and the anaerobic zone below swash plate by the swash plate.
The anaerobic zone of the reaction tank is provided with water inlet close to position one end of bottom, and the other end is provided with mud discharging mouth.
The slag-scraper is located at the top of reaction tank.
The reaction tank top is provided with scum silica frost pond, and the scum silica frost pond is provided with slag-drip opening.
The MBR films group is evenly distributed in aerobic zone, and the suction pump connects the water side of MBR film groups by pipeline,
The water extraction completed will be handled.
The bubble release is arranged between swash plate and MBR film groups, and the bubble release is connected with air dissolving system.
Further, the release includes supervisor and multiple bubbles discharge pipe, and the supervisor is long along air supporting reaction tank
Direction extension tubular structure is spent, multiple bubble release pipes connect and be symmetrically distributed in the both sides of supervisor with supervisor.
Further, air dissolving system includes dissolving, air compressor machine；The water inlet of the dissolving is by three-way connection with taking out
The water side of sucking pump is connected, and a part is handled to the water completed and is back to dissolving；The air inlet of dissolving and air compressor machine phase
Even；The delivery port of the dissolving is connected with the supervisor of bubble release.
Further, flowmeter and valve are provided between the water inlet of the dissolving and the water side of suction pump.
Further, the inside of the dissolving is provided with ultraviolet light source.
Further, the inner surface of the dissolving is provided with layer of titanium dioxide film.
Further, the slag-scraper includes chain, two sprocket wheels and multiple scum boards, and two chains are connected by chain
Multiple scum boards are fixedly installed on wheel, chain, sprocket wheel drives the scum board on chain, the scum silica frost in reaction tank is scraped into scum silica frost
Pond.
The invention has the advantages that：
1st, the present invention realizes anaerobism, aerobic environment in one reaction pool, and sets MBR membrane process in aerobic zone, cancels
Second pond, so as to greatly reduce system footprint area, improves space availability ratio, treatment effeciency good with effluent quality
High the characteristics of.
2nd, present invention uses air-float technology, the suspension in sewage is removed by air-float technology, colloid, grease type etc. is miscellaneous
Matter, oxygen is provided for aerobic zone, and MBR film groups are aerated and rinsed as aerator, prevents sludge heavy in MBR films group
Product, aerobic zone is provided with MBR film groups, is separated from sewage clear water by MBR films group, is no longer individually for the setting of MBR modules
Aerating system, saves equipment cost, and effluent characteristics are high, and effect is good.
Brief description of the drawings
Fig. 1 is that a kind of structure for integrated sewage treating apparatus that the embodiment of the present invention 1 is provided regards schematic diagram；
Fig. 2 is a kind of overlooking the structure diagram for integrated sewage treating apparatus that the embodiment of the present invention 1 is provided.
Marginal data：
1st, aerobic zone；2nd, anaerobic zone；3rd, MBR films group；4th, scum silica frost pond；5th, slag-scraper；6th, bubble release；61st, it is responsible for；62、
Bubble release pipe；7th, air compressor machine；8th, dissolving；9th, suction pump；10th, flowmeter；11st, valve；12nd, swash plate.
Embodiment
It is attached below in conjunction with specification in order to allow those skilled in the art to more fully understand and realize technical scheme
Figure and specific embodiment are described in further details.
Embodiment 1
As shown in Figure 1, 2, a kind of integrated sewage treating apparatus that the present invention is provided includes reaction tank, MBR films group 3, suction pump
9th, bubble release 6, air dissolving system, slag-scraper 5；The reaction tank length direction is uniformly distributed multiple swash plates 12, and many
Individual swash plate 12 is located in same level height, and reaction tank is divided into aerobic zone 1 and swash plate above swash plate by the swash plate 12
The anaerobic zone 2 of lower section.
The anaerobic zone 2 of reaction tank is provided with water inlet close to position one end of bottom, and the other end is provided with mud discharging mouth.
Reaction tank top is provided with scum silica frost pond 4, and scum silica frost pond 4 is provided with slag-drip opening.
Slag-scraper 5 is located at the top of reaction tank, and slag-scraper 5 includes chain, two sprocket wheels and multiple scum boards, passed through
Chain connects and multiple scum boards is fixedly installed on two sprocket wheels, chain, and sprocket wheel drives the scum board on chain, by reaction tank
Scum silica frost is scraped into scum silica frost pond 4..
MBR films group 3 is evenly distributed in aerobic zone 1, and suction pump 9 connects the water side of MBR films group 3 by pipeline, will locate
The water that reason is completed is extracted out.
Bubble release 6 is arranged between swash plate 12 and MBR films group 3.The release 6 includes supervisor 61 and multiple bubbles
Pipe 62 is discharged, the supervisor 61 is to extend tubular structure, multiple bubble release pipes 62 and supervisor along air supporting reaction tank length direction
61 connect and are symmetrically distributed in the both sides of supervisor 61.Air dissolving system includes dissolving 8, air compressor machine 7.The water inlet of dissolving 8
It is connected by three-way connection with the water side of suction pump 9, a part is handled to the water completed and is back to dissolving 8；Dissolving 8
Air inlet be connected with air compressor machine 7；The delivery port of the dissolving 8 is connected with the supervisor 61 of bubble release 6.
Specifically, being provided with flowmeter 10 and valve 11 between the water inlet of the dissolving 8 and the water side of suction pump.
Specifically, the inside of the dissolving 8 is provided with ultraviolet lamp.
Specifically, the inner surface of the dissolving 8 is provided with layer of titanium dioxide film.
In the embodiment, the specific implementation process that a kind of integrated sewage treating apparatus is used for sewage disposal is as follows：
Sewage injects anaerobic zone 2, this subregion because forming anaerobic state without aeration from the water inlet of reaction tank, when detesting
Oxygen area 2 is full of after sewage, and sewage overflow to aerobic zone 1, is provided with bubble release 6, bubble release by swash plate 12 in aerobic zone 1
Device 6 is that aerobic zone 1 provides oxygen, this subregion is formed aerobic state.
The water inlet of the dissolving 8 is connected by three-way connection with the water side of suction pump 9, and a part has been handled
Into water be back to dissolving 8；Meanwhile, air compressor machine 7 is inflated to the air inlet of dissolving 8, air is dissolved in dissolving 8
Water, forms dissolved air water, dissolved air water uniform release micro-bubble, micro-bubble and sewage in aerobic zone 1 by bubble release 6
Suspension in mixed liquor, colloid, the impurity combination shape such as grease type bubble flco floats up to the liquid level of aerobic zone 1, forms scum silica frost.
By observing the flow that flowmeter 10 is shown, the openings of sizes of control valve 11 can control to be back to the flow of dissolving 8.
The inside of the dissolving 8 is provided with ultraviolet lamp, and the inner surface of dissolving 8 is provided with layer of titanium dioxide film, ultraviolet
Dirty Organic substance in water is aoxidized and decomposed under Titanium Dioxide effect, and the work of sterilization can also be played to sewage
With.Rotated by the sprocket wheel of slag-scraper 5, drive liquid level of the scum board in aerobic zone 1 on chain to move, scum silica frost is scraped
Enter in scum silica frost pond 4, discharged by slag-drip opening.
MBR films group 3 is provided with aerobic zone 1, suction pump 9 connects the water side of MBR films group 3 by pipeline, and MBR films group 3 will
Clear water is filtered out from sewage, and is aspirated by suction pump 9 and extracted clear water out, and effluent characteristics are high, and effect is good.MBR films group 3 will
While clear water is filtered out from sewage, one layer of sludge can be formed in the outer surface of MBR films group 3, pass through the bottom of MBR films group 3
Sludge is blown off by the release micro-bubble of bubble release 6 from the outer surface of MBR films group 3.The sludge that aerobic zone 1 is formed is leaned on certainly
Return and drop down onto anaerobic zone 2.In sewage the heavier particle in part due to weight it is larger, the anaerobic zone 2 for sinking down into the lower section of swash plate 12 is formed
Sludge, swash plate 12 plays a part of isolation aerobic zone 1 and anaerobic zone 2, and MBR modules 3 can be solid by setting support to install
It is scheduled on swash plate 12.The anaerobic zone 2 of reaction tank is provided with mud discharging mouth close to the position of bottom, at regular intervals, and opening is once arranged
Mud mouthful spoil disposal.Mud discharging mouth spoil disposal is opened by being spaced, makes the sewage backflow of part aerobic zone 1 to anaerobic zone 2, sewage is in anaerobic zone
2nd, circulated back and forth before aerobic zone 1, continuous nitrification, denitrification are realized, so as to realize the denitrogenation dephosphorizing function of sewage.
A kind of integrated sewage treating apparatus provided by the present invention is described in detail above.It is used herein
Specific case is set forth to technical scheme and embodiment, and the explanation of above example is only intended to help and managed
Solve technical scheme and its core concept.It should be pointed out that for those skilled in the art, not
On the premise of departing from technical scheme, some improvement and modification can also be carried out to the present invention, these improve and modified
Also fall into the protection domain of the claims in the present invention.
Claims (7)
1. a kind of integrated sewage treating apparatus, it is characterised in that including reaction tank, MBR films group, suction pump, bubble release,
Air dissolving system, slag-scraper；The reaction tank length direction is uniformly distributed multiple swash plates, and multiple swash plates are located at same level
In height, reaction tank is divided into the aerobic zone above swash plate and the anaerobic zone below swash plate by the swash plate；
The anaerobic zone of the reaction tank is provided with water inlet close to position one end of bottom, and the other end is provided with mud discharging mouth；
The slag-scraper is located at the top of reaction tank；
The reaction tank top is provided with scum silica frost pond；The scum silica frost pond is provided with slag-drip opening；
The MBR films group is evenly distributed in aerobic zone, and the suction pump connects the water side of MBR film groups by pipeline, will locate
The water that reason is completed is extracted out；
The bubble release is arranged between swash plate and MBR film groups；The bubble release is connected with air dissolving system.
2. a kind of integrated sewage treating apparatus according to claim 1, it is characterised in that the release includes supervisor
Discharge and manage with multiple bubbles, the supervisor is to extend tubular structure along air supporting reaction tank length direction, multiple bubbles release pipe with
Supervisor connects and is symmetrically distributed in the both sides of supervisor.
3. a kind of integrated sewage treating apparatus according to claim 1, it is characterised in that air dissolving system includes molten gas
Tank, air compressor machine；The water inlet of the dissolving is connected by three-way connection with the water side of suction pump, and a part has been handled
Into water be back to dissolving；The air inlet of dissolving is connected with air compressor machine；The delivery port of the dissolving and bubble release
Supervisor be connected.
4. a kind of integrated sewage treating apparatus according to claim 3, it is characterised in that the water inlet of the dissolving
Flowmeter and valve are provided between the water side of suction pump.
5. a kind of integrated sewage treating apparatus according to claim 3, it is characterised in that the inside of the dissolving is set
There is ultraviolet light source.
6. a kind of integrated sewage treating apparatus according to claim 5, it is characterised in that the inner surface of the dissolving
Provided with layer of titanium dioxide film.
7. a kind of integrated sewage treating apparatus according to claim 1, it is characterised in that the slag-scraper includes chain
Bar, two sprocket wheels and multiple scum boards, are connected by chain and multiple scum boards, chain wheel belt are fixedly installed on two sprocket wheels, chain
Scum board on dynamic chain, the scum silica frost in reaction tank is scraped into scum silica frost pond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710572353.2A CN107188377A (en) | 2017-07-13 | 2017-07-13 | A kind of integrated sewage treating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710572353.2A CN107188377A (en) | 2017-07-13 | 2017-07-13 | A kind of integrated sewage treating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107188377A true CN107188377A (en) | 2017-09-22 |
Family
ID=59882206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710572353.2A Pending CN107188377A (en) | 2017-07-13 | 2017-07-13 | A kind of integrated sewage treating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107188377A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857334A (en) * | 2017-10-24 | 2018-03-30 | 江阴市弘诺机械设备制造有限公司 | A kind of improved sewage disposal device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188993A (en) * | 1989-12-20 | 1991-08-16 | Ebara Infilco Co Ltd | Sewage treating device |
| CN102531150A (en) * | 2012-02-20 | 2012-07-04 | 无锡工源机械有限公司 | Biological air floating treatment device |
| CN103613195A (en) * | 2013-11-25 | 2014-03-05 | 北京化工大学 | Integrated MBR (Membrane Bio-Reactor) |
| CN105540842A (en) * | 2015-12-16 | 2016-05-04 | 南昌大学 | AO reaction MBR integrated device |
| CN105836886A (en) * | 2016-06-06 | 2016-08-10 | 苏州苏科环保科技有限公司 | Novel anaerobic membrane integrated biological reactor |
| CN206232483U (en) * | 2016-11-08 | 2017-06-09 | 江门市三清环境技术工程有限公司 | Anaerobic aerobic integratedization membrane bioreactor |
| CN106904680A (en) * | 2017-04-26 | 2017-06-30 | 湖南美奕机电科技有限公司 | A kind of air floatation machine |
| CN207193042U (en) * | 2017-07-13 | 2018-04-06 | 惠州大隆基环境治理有限公司 | A kind of integrated sewage treating apparatus |
-
2017
- 2017-07-13 CN CN201710572353.2A patent/CN107188377A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188993A (en) * | 1989-12-20 | 1991-08-16 | Ebara Infilco Co Ltd | Sewage treating device |
| CN102531150A (en) * | 2012-02-20 | 2012-07-04 | 无锡工源机械有限公司 | Biological air floating treatment device |
| CN103613195A (en) * | 2013-11-25 | 2014-03-05 | 北京化工大学 | Integrated MBR (Membrane Bio-Reactor) |
| CN105540842A (en) * | 2015-12-16 | 2016-05-04 | 南昌大学 | AO reaction MBR integrated device |
| CN105836886A (en) * | 2016-06-06 | 2016-08-10 | 苏州苏科环保科技有限公司 | Novel anaerobic membrane integrated biological reactor |
| CN206232483U (en) * | 2016-11-08 | 2017-06-09 | 江门市三清环境技术工程有限公司 | Anaerobic aerobic integratedization membrane bioreactor |
| CN106904680A (en) * | 2017-04-26 | 2017-06-30 | 湖南美奕机电科技有限公司 | A kind of air floatation machine |
| CN207193042U (en) * | 2017-07-13 | 2018-04-06 | 惠州大隆基环境治理有限公司 | A kind of integrated sewage treating apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857334A (en) * | 2017-10-24 | 2018-03-30 | 江阴市弘诺机械设备制造有限公司 | A kind of improved sewage disposal device |
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Application publication date: 20170922 |
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