CN106830243A - Multi-functional diatomite coagulation air-float integration apparatus - Google Patents
Multi-functional diatomite coagulation air-float integration apparatus Download PDFInfo
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- CN106830243A CN106830243A CN201710087553.9A CN201710087553A CN106830243A CN 106830243 A CN106830243 A CN 106830243A CN 201710087553 A CN201710087553 A CN 201710087553A CN 106830243 A CN106830243 A CN 106830243A
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- chamber
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- diatomite
- integration apparatus
- coagulating
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of multi-functional diatomite coagulation air-float integration apparatus, the first agitator is provided with coagulating chamber, water inlet pipe is arranged on coagulating chamber side top, the second agitator is provided with flocculating chamber；Coagulating chamber and flocculating chamber's homonymy top are located between blanking, diatomite blanking machine and flocculant blanking machine are provided between blanking, diatomite blanking machine is located at the top of coagulating chamber side, and flocculant blanking machine is located at the top of flocculating chamber side；Coagulating chamber is adjacent with flocculating chamber and is connected by bottom；Separator is located at the homonymy of coagulating chamber and flocculating chamber, and separator includes outer case, aeration mechanism, taper flaring solarization air cell, separation chamber, slag scraping mechanism, annular collector pipe and discharge pipeline, and flocculating chamber is connected by connecting pipe with taper flaring solarization air cell.Integrated, high degree of automation of the invention, removal pollutant kind is more, and removal is thorough, is not influenceed by aqueous suspension is entered, stable, safeguards simple, and operation cost is low.
Description
Technical field
The invention belongs to industrial oily waste water process field, and in particular to a kind of multi-functional diatomite coagulation air-float is integrally
Change equipment.
Background technology
Often containing the pollutant such as oily substance, colloidal substance in industrial wastewater, the moieties microorganism compared with difficult degradation,
And microorganism flco can be wrapped, and cause microorganism to contact oxygen, dead mud is formed, sewage treating efficiency is had a strong impact on, press down
The breeding and growth of microorganism processed.Therefore before needing waste water to enter biochemistry pool, such material is got rid of.Such as coal chemical industrial waste water
In light petroleum class material and heavy oil material, paper waste dyeing textile class waste water in colloidal substance, food processing class give up
Animals and plants oils in water and slaughtering wastewater etc., should all get rid of in preprocessing process.
In current traditional handicraft frequently with technology have PAC-PAM mixed condensed gas flotation processes, electrolytic gas float glass process, dissipate gas Bubble-floating Method,
Dissolved air flotation etc..Advantage：The dissolved oxygen in water is increased during air supporting, scum silica frost is oxygen-containing, be difficult corruption, be conducive to follow-up place
Reason；Flotation tank surface loading is high, and hydraulic detention time is short, the pond depth, small volume；Scum silica frost moisture content is low, residue-discharge convenience；Add wadding
During solidifying agent treatment waste water, required dose is less.(2) shortcoming：Power consumption is more, and medicament usage amount is big, and running cost is higher；Waste water hangs
When float concentration is high, decompression release is easily blocked, complex management；Engineering construction floor space is big, design complicated, supporting operation
It is complicated；Act on single, remover limited quality, and fluctuation of service；Stink peculiar smell is serious in other processing procedure, if added
Deodorizing device, will largely improve cost of investment and running cost.
The content of the invention
It is an object of the invention to provide multi-functional diatomite coagulation air-float integration apparatus.The present invention is integrated
Change, high degree of automation, removal pollutant kind is more, and removal is thorough, is not influenceed by aqueous suspension is entered, it is stable, safeguard
Simply, and operation cost is low.
The technical solution adopted by the present invention：A kind of multi-functional diatomite coagulation air-float integration apparatus, it includes coagulation
Between room, flocculating chamber, blanking and separator, the first agitator is provided with coagulating chamber, water inlet pipe is arranged on coagulating chamber side top,
The second agitator is provided with flocculating chamber；Coagulating chamber and flocculating chamber's homonymy top are located between blanking, diatom essence is provided between blanking
Native blanking machine and flocculant blanking machine, diatomite blanking machine are located at the top of coagulating chamber side, and flocculant blanking machine is located at wadding
The top of solidifying room side；Coagulating chamber is adjacent with flocculating chamber and is connected by bottom；
Separator is located at the homonymy of coagulating chamber and flocculating chamber, and separator includes outer case, aeration mechanism, taper flaring aeration
Room, separation chamber, slag scraping mechanism, annular collector pipe and discharge pipeline, wherein, flocculating chamber is by connecting pipe and taper flaring solarization air cell
Connection, taper flaring solarization air cell is arranged on the position above the deflection of the middle part of outer case, and taper is internally located at gradually in outer case
The part expanded on the outside of solarization air cell is separation chamber, and annular collector pipe is arranged in separation chamber around taper flaring solarization air cell, is being separated
Chamber interior lower section is provided with a circle to the centroclinal swash plate of separator bottom, and discharge pipeline one end connects with separator bottom, edge
Peripherally outside is provided with scum silica frost ditch in outer case, and a slag notch is provided with the outer of scum silica frost ditch；
Slag scraping mechanism is located at separator top, slag scraping mechanism by motor, connection cross bar, interior scrape slag brush and scrape slag brush group outward
Into, connection cross bar level at a certain distance from above the outer case, connection cross bar with its bar middle part for round dot is rotated, and
Connect at the rotating middle part round dot of cross bar and motor connection, drive connection cross bar to be rotated by motor, connection cross bar is upper
Slag brush is scraped in being fixed with one section directly over separation chamber of the body of rod, a section be located on connection cross bar directly over scum silica frost ditch
Slag brush is scraped outside being fixed with the body of rod；
Aeration mechanism is made up of air blower, aeration tube and aerator, and air blower is fixed on separator outer container in vitro, aerator
Taper flaring solarization air cell middle part is fixed on, air blower is connected with aerator by aeration tube.
Further, also including scum chamber and surge chamber, scum chamber is located at the underface of slag notch, annular collector pipe with it is slow
Rush room to be connected by communicating pipe, the outlet pipe for connecting next treatment process is provided with surge chamber.
Further, including air blast computer room, the air blower is arranged in air blast computer room.
Further, also including control room, it is provided with switch board in control room, the machine of switch board and the integration apparatus
Electric installation is connected, the aeration mechanism.
Further, first agitator and the second agitator are by rotary electric machine, rotary shaft, fixed seat and stirring end
Composition, wherein, rotary electric machine is fixed on the top of coagulating chamber and flocculating chamber by fixed seat, and rotary electric machine is connected with rotary shaft,
Rotary shaft is connected with stirring end.
Further, described micro-hole aerator is uniformly distributed at a certain distance by several micro porous aeration heads, and each micropore
Aeration head is connected with aeration tube.
Further, the outer top of the scum silica frost ditch is higher by outer case along certain distance.
Further, including a support, described support one end is connected with taper flaring solarization air cell, and the other end is fixed on outer container
The bottom of body.
Further, including a sludge-tank, the sludge-tank is connected with discharge pipeline.
Further, including removal of impurities pipe, the removal of impurities pipe is connected with the bottom of taper flaring solarization air cell, for by taper gradually
Expand the debris discharge of solarization air cell bottom.
Its advantage is the present invention compared with prior art：1st, the present invention can simultaneously remove the pumice oils thing in waste water
The materials such as matter, heavy oil kind material, vegetable and animals oils, colloid, macromolecular COD, colourity, heavy metal ion, suspension, stink, realize
The removal effect of multifunctional efficient rate.2nd, high degree of automation of the present invention, all process steps for being integrated with coagulation air-float of integration,
Floor space is small.3rd, diatomite inorganic agent used in the present invention is nanoporous structure, and compared to traditional PAC, consumption subtracts
Less with 50%, and removal is more efficient, more thoroughly；Equipment PAM dosages are the 50% of traditional handicraft.Reduce medicament usage amount
With scum silica frost, sediment yield, operation cost is reduced.4th, the present invention in separator be new structure, can realize simultaneously scum silica frost,
Waste water, sediment are efficiently separated；Collector pipe in the middle part of the separator, is catchmented by 45 ° obliquely of the double of diameter 5mm
Hole, can make mixed liquor during descending, and waste water enters collector pipe obliquely, and sediment sinks down into bottom, the swash plate knot of bottom
Structure so that sediment slides to bottom and discharged by discharge pipeline.5th, the slag scraping mechanism at the top of the separator in the present invention can be wiped off simultaneously
Scum silica frost in separator in the scum silica frost on separation chamber top and scum silica frost ditch, efficiently easily realize scum silica frost collects removal.Avoid point
From indoor scum silica frost because the holdup time is long, bubbles burst causes scum silica frost to suspend.6th, diatomite inorganic agent is added in the present invention, can
Stink peculiar smell in absorption waste water, does not have any stink peculiar smell in all processes.7th, the present invention in diatomite inorganic agent due to
Its nano level micropore, to macromolecular COD clearances up to 30%-60%, heavy metal ion remaval rate up to more than 85%,
To the removal of colourity up to 80%, to the removal of SS up to more than 90%.When pollutant concentration of intaking is higher, can be by adding
Excessive diatomite inorganic agent, increases the clearance of pollutant, protects subsequent biochemical system not by impacting that change of water quality is brought
And influence.
Brief description of the drawings
Fig. 1 is schematic top plan view of the invention；
Fig. 2 is along the profile of A-A for Fig. 1；
Fig. 3 is the profile in Fig. 1 along B-B.
Specific embodiment
Such as Fig. 1, a kind of multi-functional diatomite coagulation air-float integration apparatus, it includes coagulating chamber 1, flocculating chamber 2, blanking
Between 3, support 4, scum chamber 5, control room 6, air blast computer room 7, removal of impurities pipe 8, surge chamber 9, separator 11, is provided with coagulating chamber 1
First agitator 12, water inlet pipe 13 is arranged on the side of coagulating chamber 1 top, and the second agitator 14 is provided with flocculating chamber 2；Between blanking
3 are located at coagulating chamber 1 and the homonymy of flocculating chamber 2 top, and 3 are provided with diatomite blanking machine 15 and flocculant blanking machine 16 between blanking,
Diatomite blanking machine 15 is located at the top of the side of coagulating chamber 1, and flocculant blanking machine 16 is located at the top of the side of flocculating chamber 2；
In coagulating chamber 1, mixing is continuously stirred through the first agitator 12；Coagulating chamber 1 is adjacent with flocculating chamber 2 and is connected by bottom, in wadding
In solidifying room 2, mixed liquor and the flocculant PAM hybrid reactions added through between blanking 3, through the low rate mixing of the second agitator 14, are formed
The relatively big flocculating body of stabilization；
As Fig. 2 and Fig. 3, separator 11 are located at the homonymy of coagulating chamber 1 and flocculating chamber 2, separator 11 includes outer case 17, exposes
Mechanism of qi structure, taper flaring solarization air cell 18, separation chamber 19, slag scraping mechanism, annular collector pipe 20 and discharge pipeline 21, wherein, flocculating chamber 2
Connected with taper flaring solarization air cell 18 by connecting pipe 22, taper flaring solarization air cell 18 is arranged on the middle part deflection of outer case 17
The position of top, in taper flaring solarization air cell 18, uniform aeration is carried out by being aerated mechanism, and micro-bubble is carried out fully with flco
Contact, forms the floating object of light weight, then enters separation chamber 19 by the top overflow of taper flaring solarization air cell 18, in separation chamber 19
It is interior, complete scum silica frost, liquid, the separation of precipitation solid.In the portion for being internally located at the outside of taper flaring solarization air cell 18 of outer case 17
It is divided into separation chamber 19, annular collector pipe 20 is arranged in separation chamber 19 around taper flaring solarization air cell 18, inside separation chamber 19
Lower section is provided with a circle to the inclined swash plate 23 of the bottom centre of separator 11, and the one end of discharge pipeline 21 connects with the bottom of separator 11,
Peripherally outside is provided with scum silica frost ditch 24 in outer case 17, and a slag notch 25 is provided with the outer of scum silica frost ditch 24；
Slag scraping mechanism is located at the top of separator 11, slag scraping mechanism by motor 26, connection cross bar 27, interior scrape slag brush 28 and scrape outward
Slag brush 29 is constituted, and the connection level of cross bar 27 connects cross bar 27 to be in the middle part of its bar across at a certain distance from the top of outer case 17
Round dot is rotated, and is connected with motor 26 at the rotating middle part round dot of connection cross bar 27, and connection cross bar is driven by motor 26
27 are rotated, and are located on connection cross bar 27 on one section directly over separation chamber 19 of the body of rod in being fixed with and are scraped slag brush 28, are connected
It is located on cross bar 27 on one section directly over scum silica frost ditch 24 of the body of rod outside being fixed with and scrapes slag brush 29；
Aeration mechanism in the present invention is made up of air blower 30, aeration tube 31 and aerator 32, and air blower 30 is fixed on point
Outside the outer case 17 of device 11, aerator 32 is fixed on the middle part of taper flaring solarization air cell 18, and air blower 30 is with aerator 32 by exposing
Tracheae 31 is connected.
Scum chamber 5 in the present invention is located at the underface of slag notch 25, and annular collector pipe 20 passes through communicating pipe with surge chamber 9
33 connections, the outlet pipe 34 for connecting next treatment process is provided with surge chamber 9.The air blower 30 is arranged on air blast computer room 7
It is interior.Switch board 35 is provided with control room 6, switch board 35 is connected with the electromechanical assembly of the integration apparatus.Described first stirs
The agitator 14 of device 12 and second is mixed to be constituted by rotary electric machine 36, rotary shaft 37, fixed seat 38 and stirring end 39, wherein, rotate
Motor 36 is fixed on the top of coagulating chamber 1 and flocculating chamber 2 by fixed seat 38, and rotary electric machine 36 is connected with rotary shaft 37, rotates
Axle 37 is connected with stirring end 39.Described micro-hole aerator 32 is uniformly distributed at a certain distance by several micro porous aeration heads, and respectively
Micro porous aeration head is connected with aeration tube 31.The outer top of the scum silica frost ditch 24 is higher by outer case 17 along certain distance.It is described
The one end of support 4 is connected with taper flaring solarization air cell 18, and the other end is fixed on the bottom of outer case 17.The sludge-tank and discharge pipeline
21 connections.The removal of impurities pipe 8 is connected with the bottom of taper flaring solarization air cell 18, for by the miscellaneous of the bottom of taper flaring solarization air cell 18
Thing is discharged.
After mixed liquor enters separation chamber 19 in the present invention, move from top to bottom, the scum silica frost that micro air bubble and flco are formed by
Water is much smaller than in density, progressively collects the top for swimming in separation chamber 19, by slag scraping mechanism, by scum silica frost from the outer wall of separation chamber 19
Top enters scum silica frost ditch 24, and scum silica frost enters scum chamber 5 under the impetus of slag scraping mechanism through slag notch 25, and scum silica frost is contained within
The pollutants such as lightweight oily substance, macromolecular COD, colourity, colloidal substance, stink, the partial contamination thing with the removal of scum silica frost,
It is removed.In separation chamber 19, during waste water is descending, density is settled down to the bottom of separation chamber 19 more than the flco material of water, passes through
Swash plate 23 is collected to bottom centre, through draining into sludge-tank outside discharge pipeline 21, is processed together with activated sludge, suspension, heavy oil, weight
The pollutants such as metal, are flocculated by diatomite inorganic agent, and its flco density is more than waste water, is got rid of through spoil disposal.In separation chamber 19
Portion, sets annular collector pipe 20, and the waste water that scum silica frost, sediment are separated collects inflow surge chamber 9 by annular collector pipe 20, real
The purpose of pollutant is now removed, then the delivery port gravity flow on the top of buffered room 9 enters next process.
Claims (10)
1. multi-functional diatomite coagulation air-float integration apparatus, it includes between coagulating chamber, flocculating chamber, blanking and separator, its
It is characterised by, is provided with the first agitator in coagulating chamber, water inlet pipe is arranged on coagulating chamber side top, the is provided with flocculating chamber
Two agitators；Coagulating chamber and flocculating chamber's homonymy top are located between blanking, diatomite blanking machine and flocculant are provided between blanking
Blanking machine, diatomite blanking machine is located at the top of coagulating chamber side, and flocculant blanking machine is located at the top of flocculating chamber side；It is mixed
Solidifying room is adjacent with flocculating chamber and is connected by bottom；
Separator is located at the homonymy of coagulating chamber and flocculating chamber, separator include outer case, aeration mechanism, taper flaring solarization air cell,
Separation chamber, slag scraping mechanism, annular collector pipe and discharge pipeline, wherein, flocculating chamber is connected by connecting pipe with taper flaring solarization air cell
Logical, taper flaring solarization air cell is arranged on the position above the deflection of the middle part of outer case, and taper flaring is internally located in outer case
Part on the outside of solarization air cell is separation chamber, and annular collector pipe is arranged in separation chamber around taper flaring solarization air cell, in separation chamber
Lower inside is provided with a circle to the centroclinal swash plate of separator bottom, and discharge pipeline one end connects with separator bottom, along outer
Peripherally outside is provided with scum silica frost ditch on casing, and a slag notch is provided with the outer of scum silica frost ditch；
Slag scraping mechanism is located at separator top, slag scraping mechanism by motor, connection cross bar, it is interior scrape slag brush and it is outer scrape slag brush and constitute, even
Cross bar level is connect at a certain distance from above the outer case, connection cross bar with its bar middle part for round dot is rotated, and connection
At the rotating middle part round dot of cross bar and motor connection, drive connection cross bar to be rotated by motor, be located on connection cross bar point
Slag brush, the body of rod of a section be located on connection cross bar directly over scum silica frost ditch are scraped in being fixed with one section directly over room of the body of rod
On be fixed with and outer scrape slag brush；
Aeration mechanism is made up of air blower, aeration tube and aerator, and air blower is fixed on separator outer container in vitro, and aerator is fixed
In the middle part of taper flaring solarization air cell, air blower is connected with aerator by aeration tube.
2. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that also including floating
Grit chamber and surge chamber, scum chamber are located at the underface of slag notch, and annular collector pipe is connected with surge chamber by communicating pipe, surge chamber
Inside it is provided with the outlet pipe for connecting next treatment process.
3. multi-functional diatomite coagulation air-float integration apparatus according to claim 2, it is characterised in that including air blast
Computer room, the air blower is arranged in air blast computer room.
4. multi-functional diatomite coagulation air-float integration apparatus according to claim 1 and 2, it is characterised in that also wrap
Control room is included, switch board is provided with control room, switch board is connected with the electromechanical assembly of the integration apparatus, the aerator
Structure.
5. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that described first
Agitator and the second agitator are constituted by rotary electric machine, rotary shaft, fixed seat and stirring end, wherein, rotary electric machine is by solid
Reservation is fixed on the top of coagulating chamber and flocculating chamber, and rotary electric machine is connected with rotary shaft, and rotary shaft is connected with stirring end.
6. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that described is micro-
Hole aerator is uniformly distributed at a certain distance by several micro porous aeration heads, and each micro porous aeration head is connected with aeration tube.
7. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that the scum silica frost
The outer top of ditch is higher by outer case along certain distance.
8. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that including
Frame, described support one end is connected with taper flaring solarization air cell, and the other end is fixed on the bottom of outer case.
9. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that dirty including
Mud sump, the sludge-tank is connected with discharge pipeline.
10. multi-functional diatomite coagulation air-float integration apparatus according to claim 1, it is characterised in that including removing
Miscellaneous pipe, the removal of impurities pipe is connected with the bottom of taper flaring solarization air cell, for the debris of taper flaring solarization air cell bottom to be discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710087553.9A CN106830243A (en) | 2017-02-17 | 2017-02-17 | Multi-functional diatomite coagulation air-float integration apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710087553.9A CN106830243A (en) | 2017-02-17 | 2017-02-17 | Multi-functional diatomite coagulation air-float integration apparatus |
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| CN106830243A true CN106830243A (en) | 2017-06-13 |
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| CN201710087553.9A Pending CN106830243A (en) | 2017-02-17 | 2017-02-17 | Multi-functional diatomite coagulation air-float integration apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107337263A (en) * | 2017-08-23 | 2017-11-10 | 江苏维尔利环保科技股份有限公司 | Vertical-flow coagulating sedimentation and the dual-purpose pond of air supporting |
| WO2021036459A1 (en) * | 2019-08-30 | 2021-03-04 | 中清信益环境(南京)有限公司 | Vertical-flow type precipitation and air floatation device for water treatment and working method therefor |
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| CN107337263A (en) * | 2017-08-23 | 2017-11-10 | 江苏维尔利环保科技股份有限公司 | Vertical-flow coagulating sedimentation and the dual-purpose pond of air supporting |
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