CN108328874A - A kind of efficient process equipment of integrated oil-containing waste water - Google Patents
A kind of efficient process equipment of integrated oil-containing waste water Download PDFInfo
- Publication number
- CN108328874A CN108328874A CN201810279968.0A CN201810279968A CN108328874A CN 108328874 A CN108328874 A CN 108328874A CN 201810279968 A CN201810279968 A CN 201810279968A CN 108328874 A CN108328874 A CN 108328874A
- Authority
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- Prior art keywords
- waste water
- batch mixing
- containing waste
- efficient process
- process equipment
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Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 15
- 238000005188 flotation Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical group C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 25
- 239000010865 sewage Substances 0.000 description 10
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- -1 coking Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/32—Hydrocarbons, e.g. oil
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
Abstract
The invention discloses a kind of efficient process equipment of integrated oil-containing waste water comprising successively with batch mixing tower, primary sedimentation tank, refined filtration pipe, flotation tank and the degraded pond of pipeline connection setting；The upper side wall of the batch mixing tower is connected with reciprocating pump, feed inlet is provided at the top of the batch mixing tower, several sieve plates are distributed in even level in the cavity of the batch mixing tower, and the sieve plate is set on vertical shaft, the shaft is connect with curved bar, and the curved bar is by electrical motor driven；It is provided with strainer among the primary sedimentation tank, primary sedimentation tank is divided into the first decanting zone and the second decanting zone, the upper side wall of first decanting zone is connect with batch mixing tower lower wall with pipeline, and second decanting zone lower wall is connect with refined filtration pipe with pipeline；The efficient process device structure process of the integrated oil-containing waste water of the present invention is simple, high degree of automation, processing capacity are strong, and system processing water outlet disclosure satisfy that corresponding discharge standard, while separate and recover part oil slick.
Description
Technical field
The present invention relates to sewage treatment fields, and in particular to a kind of sewage disposal device is more particularly to a kind of integration
The efficient process equipment of oily waste water.
Background technology
Oily waste water is mainly derived from the Ministry of Industry such as oil, petrochemical industry, steel, coking, gas generating station, mechanical processing
Door.The useless oil percentage in water of different department's discharges is widely different, up to 2000-3000mg/L.Oils contained in waste water
Substance, including natural oil, oil product, tar and its fraction and edible animals and plants oil ＆ fat class.From to water body
For pollution, mainly oil and tar.Oily waste water is big with water, water quality is complicated, it is difficult to which the characteristics such as biodegradation enter
Natural environment causes very serious pollution to plant, soil, water body etc., is widely considered a kind of intractable Industry Waste
Water.Consider from environmental angle, the processing of oily waste water should consider to recycle oily substance first, and make full use of treated water
Resource.
The inefficient processing for the oily waste water that industry generates and inorganization processing are a kind of wastes to water resource, handle well and contain
Oily waste water, not only makes water resource be utilized effectively, while reducing the discharge of sewage, also has one to the protection of ecological environment
Fixed meaning.The source of oily waste water, ingredient and its existence form are to influence it to handle the principal element of complexity.It is right
In its processing method, it is roughly divided into four classes：First, the physical method based on centrifugal separation, coalescence, membrane separation process；Two
It is the chemical method based on chemical oxidization method, photoresist process；Third, using floatation, absorption method, magnetic suck partition method as representative
Physical-chemical process；Fourth, the biochemical process headed by activated sludge process, biofilm.Above-mentioned various processing modes all exist each
From limitation.
Therefore, it is necessary to develop a kind of intensive, high degree of automation, anti-variation water quality ability is strong, and the part of recycling is floating
The high oiliness sewage treatment equipment of oily curing degree.
Invention content
Processing for oily waste water is considered as recycling oil therein as possible first, to repeat or to recycle, then
Further according to the state of its source and greasy dirt, ingredient, suitable treatment agent and technique process are taken, makes up to country's discharge mark
It is accurate.
Specifically, in order to overcome the above problem, the present invention to provide a kind of oiliness sewage treatment equipment, integrated artistic letter
It is single, securely and reliably, energy-efficient, investment reduction cost, resource utilization part oil slick while waste water high-efficiency processing up to standard,
The treatment technology that oily waste water can be promoted is horizontal.
The technical solution of the present invention is to provide a kind of oiliness sewage treatment equipment, including successively with the mixed of pipeline connection setting
Expect tower, primary sedimentation tank, refined filtration pipe, flotation tank and degraded pond；The upper side wall of the batch mixing tower is connected with reciprocating pump, the batch mixing tower
Top is provided with feed inlet, and several sieve plates are distributed in even level in the cavity of the batch mixing tower, and the sieve plate is set to vertically
Shaft on, the shaft is connect with curved bar, and the curved bar is by electrical motor driven；It is provided with strainer among the primary sedimentation tank,
Primary sedimentation tank is divided into the first decanting zone and the second decanting zone, the upper side wall and batch mixing tower lower wall of first decanting zone are with pipe
Road connects, and second decanting zone lower wall is connect with refined filtration pipe with pipeline.
In a preferred embodiment, first charging aperture and second charging aperture are provided at the top of the batch mixing tower.
Wherein, first charging aperture can be used for feeding intake for oily release agent, and second charging aperture can be used for calcium hydroxide（Ca(OH)2）Throwing
Material.
In a preferred embodiment, the sieve plate is slotted plate, aperture 0.3cm-2cm.The sieve plate
Diameter is slightly less than the internal diameter of the mixing column, and the quantity of the sieve plate is 5-20.Be added oily release agent and calcium hydroxide it
Afterwards, slotted plate up-down vibration is driven by electro-motor so that be sufficiently mixed between material.
In a preferred embodiment, first decanting zone bottom is provided with the inclined plate to sidewall slope, inclined plate
It is provided with dirt-discherging outlet on the side wall of bottom end.Sedimentation operation is carried out after flowing into the first decanting zone from the mixed liquor flowed out in mixing column.
Particles such as large granular impurity and the complete calcium hydroxide of unreacted etc. can not be by between the first decanting zone and the second decanting zone
Strainer, therefore, these impurity gradually sink to bottom in the first decanting zone.By the way that inclined plate is arranged in bottom so that impurity slides to
Bottom can finally be cleared out by dirt-discherging outlet.
In a preferred embodiment, the strainer both sides are provided with oil pumping hose.Oil belongs to small molecule, Ke Yitou
Filter screen.Strainer both sides are provided with oil pumping hose, and connect air pump, the oil slick that can generate precipitation is extracted out, and grease is completed
Lock out operation.
In a preferred embodiment, being staggered in the refined filtration pipe, there are three filter layers, wherein upper layer is nothing
Bituminous coal layer, middle level are silica layers, and lower layer is activated carbon filter cotton layer.The water flowed out from the second settling tank passes sequentially through triple mistakes
Filter so that the water for filtering acquisition is cleaner.
In a preferred embodiment, it is additionally provided with the first water between the refined filtration pipe and second decanting zone
Pump, is provided with the second water pump, the degraded pond side wall is provided with discharge outlet between the flotation tank and the degraded pond.
The beneficial effects of the invention are as follows：
1, oily waste water first passes through oily release agent and calcium hydroxide synergy and realizes water-oil separating by integral type degreasing unit,
And recyclable oil slick, enter in flotation tank hydrophobic little particle of going out afterwards, enters degraded pond hydrolysis acidification and degradation of organic substances afterwards, most
The COD indexs of heel row water outlet are less than 40mg/L, and oil content is smaller than 2mg/L.
2, general water treatment facilities mostly uses vortex reaction to make water and additive mix, but effect is changed by water
And it is unstable.And the sewage treatment equipment of the present invention is then mixed with oscillating screen plate, it is not easy to the impact effect by water variation.
3, oiliness sewage treatment equipment of the invention has operating condition that is quick, energy saving, stablizing, automation mechanized operation degree
The features such as high, significantly improves contaminant removal capacity, can efficiently remove oils and pollutant and qualified discharge in waste water, simultaneously
Resource utilization part oil slick.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the enlarged diagram of the refined filtration pipe of the present invention；
Wherein, 1- reciprocating pumps, 11- water inlets, 2- batch mixing towers, 21- first charging apertures, 22- second charging apertures, 23- sieve plates, 24-
Shaft, 25- curved bars, 26- electro-motors, 3- primary sedimentation tanks, the first decanting zones 31-, the second decanting zones 32-, 33- strainers, 34- are oblique
Plate, 35- dirt-discherging outlets, 36- oil pumping hoses, the first water pumps of 4-, 5- refined filtration pipes, 51- anthracite coal measures, 52- silica layers, 53- activated carbons
Filter cotton layer, 6- flotation tanks, the second water pumps of 7-, 8- degraded ponds, 81- discharge outlet.
Specific implementation mode
In order to which so that the present invention is realized technological means, creation characteristic, reached purpose and effect are easy to understand, tie below
Specific embodiment is closed, the present invention is further explained.
As shown in Figure 1, a kind of oiliness sewage treatment equipment, including successively with batch mixing tower 2, the primary sedimentation tank of pipeline connection setting
3, refined filtration pipe 5, flotation tank 6 and degraded pond 8.The upper side wall of batch mixing tower 2 is connected with reciprocating pump 1, and reciprocating pump 1 will by water inlet 11
Oily waste water imports in batch mixing tower 1.2 top of batch mixing tower is provided with first charging aperture 21 and second charging aperture 22.First charging aperture
21 can be used for feeding intake for oily release agent, and second charging aperture 22 can be used for feeding intake for calcium hydroxide.In the cavity of batch mixing tower 2
Even horizontal distribution has 10 pieces of slotted plates 23, sieve plate to be set on vertical shaft 24, and shaft 24 is connect with curved bar 25, curved bar 25
It is driven by electro-motor 26, and forms the movement locus of up-down vibration.It is provided with strainer 33 among primary sedimentation tank 3, and by primary sedimentation tank 3
It is divided into the first decanting zone 31 and the second decanting zone 32.The upper side wall of first decanting zone 31 is connected with 2 lower wall of batch mixing tower with pipeline
It connects.Second decanting zone, 32 lower wall is connect with refined filtration pipe 5 with pipeline, and between be additionally provided with the first water pump 4.
Specifically, the aperture of sieve plate 23 is 0.5cm, the diameter of sieve plate 23 is slightly less than the internal diameter of mixing column 2.
Specifically, 31 bottom of the first decanting zone is provided with the inclined plate 34 to sidewall slope, set on the side wall of 34 bottom end of inclined plate
It is equipped with dirt-discherging outlet 35.The both sides of strainer 33 are provided with oil pumping hose 36, and connect air pump.
Specifically, being provided with the second water pump 7 between flotation tank 6 and degraded pond 8,8 side wall of degraded pond is provided with discharge outlet 81.
Wherein, as shown in Fig. 2, being the enlarged diagram of refined filtration pipe 5.Upper layer is anthracite coal measure 51, and middle level is silica layer 52,
53。
The operation principle of oiliness sewage treatment equipment of the present invention is：The oily waste water that system generates is first passed through into oily separation
Water-oil separating, and recovery section oil slick are realized in agent and calcium hydroxide synergy after being mixed well by batch mixing tower, by just heavy
Pond and refined filtration pipe filter off most impurity, enter flotation tank thereafter, remove hydrophobic little particle, and finally enter degraded pond,
Degradation larger molecular organics.Relevant emission standards can be met by treated water, wherein water outlet COD indexs are less than
40mg/L, oil content are less than 2mg/L.The efficient process system can fast implement grease layering, and being handled by the set process can
So that each limit value of discharge of wastewater be better than discharging standards, be mainly used for steel cold rolling/hot rolling industry, parts machining and its
The harmless treatment for the oily waste water that the process of metal working of his industry generates and oil slick removal process, to improving promotion industry liter
Grade and structure optimization, promoting industrial one has important meaning.
The above example only one such embodiment of the present invention, the description thereof is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection model of the present invention
It encloses.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of efficient process equipment of integrated oil-containing waste water, it is characterised in that：Including successively with the mixed of pipeline connection setting
Expect tower, primary sedimentation tank, refined filtration pipe, flotation tank and degraded pond；
The upper side wall of the batch mixing tower is connected with reciprocating pump, and feed inlet is provided at the top of the batch mixing tower, the batch mixing tower
Several sieve plates are distributed in even level in cavity, and the sieve plate is set on vertical shaft, and the shaft is connect with curved bar, institute
Curved bar is stated by electrical motor driven；
It is provided with strainer among the primary sedimentation tank, primary sedimentation tank is divided into the first decanting zone and the second decanting zone, described first is heavy
The upper side wall in drop area is connect with batch mixing tower lower wall with pipeline, and second decanting zone lower wall is connect with refined filtration pipe with pipeline.
2. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：The batch mixing tower
Top is provided with first charging aperture and second charging aperture.
3. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：The sieve plate is band
Hole sieve plate, aperture 0.3cm-2cm.
4. the efficient process equipment of integrated oil-containing waste water according to claim 3, it is characterised in that：The sieve plate it is straight
Diameter is slightly less than the internal diameter of the mixing column, and the quantity of the sieve plate is 5-20.
5. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：First sedimentation
Area bottom is provided with the inclined plate to sidewall slope, and dirt-discherging outlet is provided on the side wall of inclined plate bottom end.
6. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：The strainer both sides
It is provided with oil pumping hose.
7. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：In the refined filtration pipe
Being staggered, there are three filter layers, wherein upper layer is anthracite coal measure, and middle level is silica layer, and lower layer is activated carbon filter cotton layer.
8. the efficient process equipment of integrated oil-containing waste water according to claim 1, it is characterised in that：The refined filtration pipe and
It is additionally provided with the first water pump between second decanting zone, the second water pump is provided between the flotation tank and the degraded pond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279968.0A CN108328874A (en) | 2018-04-01 | 2018-04-01 | A kind of efficient process equipment of integrated oil-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279968.0A CN108328874A (en) | 2018-04-01 | 2018-04-01 | A kind of efficient process equipment of integrated oil-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108328874A true CN108328874A (en) | 2018-07-27 |
Family
ID=62932549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810279968.0A Pending CN108328874A (en) | 2018-04-01 | 2018-04-01 | A kind of efficient process equipment of integrated oil-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108328874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079505A (en) * | 2020-10-08 | 2020-12-15 | 杨桂香 | Intensive rural sewage treatment integration equipment |
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| CN208898688U (en) * | 2018-04-01 | 2019-05-24 | 苏州浦深环保科技有限公司 | A kind of efficient process equipment of integrated oil-containing waste water |
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2018
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|---|---|---|---|---|
| CN105110492A (en) * | 2015-08-18 | 2015-12-02 | 安徽星元环保科技有限公司 | Vibration type oil separation pool based on cam mechanism |
| CN205463119U (en) * | 2016-01-07 | 2016-08-17 | 昆明理工大学 | A equipment for sieving mix metallurgical material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079505A (en) * | 2020-10-08 | 2020-12-15 | 杨桂香 | Intensive rural sewage treatment integration equipment |
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