CN205382008U - Use biological water cellar purifier of module that strains slowly - Google Patents

Use biological water cellar purifier of module that strains slowly Download PDF

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Publication number
CN205382008U
CN205382008U CN201620024783.1U CN201620024783U CN205382008U CN 205382008 U CN205382008 U CN 205382008U CN 201620024783 U CN201620024783 U CN 201620024783U CN 205382008 U CN205382008 U CN 205382008U
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CN
China
Prior art keywords
cellar
storing things
water
module
slowly
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Expired - Fee Related
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CN201620024783.1U
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Chinese (zh)
Inventor
于上
黄子叶
陈小齐
王玥
孙洁
隋天禹
罗斌
林博闻
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Wuhan University WHU
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Wuhan University WHU
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Priority to CN201620024783.1U priority Critical patent/CN205382008U/en
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Publication of CN205382008U publication Critical patent/CN205382008U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The utility model provides an use biological water cellar purifier of module that strains slowly, including the cellar for storing things body, be located the water intake device at cellar for storing things body top, at least one biology that is located the internal portion in cellar for storing things, is used for to purify the rainwater is strained the module slowly and is located the external side in cellar for storing things, is used for discarding just the rainwater and is supplied to the first rain of water cellar to abandon a class device follow -up rainwater, the biological module of straining slowly is mainly by filtering the filler piece and being used for the parcel and fixing the metal mesh casing that filters the piece that packs constituting, it is activated carbon layer, river sand filtration matrix layer, gravel layer from inside to outside in proper order to filter the piece that packs, just rain abandon class device including from top to bottom adjacent by middle level baffle spaced catch basin with abandon the rain room, be equipped with the through -hole on the baffle plate body of middle level, the through -hole below sets up spacing net, is equipped with the floater in the spacing net and is fixed in the eliminator plate that the floater top just can cover the through -hole. The utility model discloses not only the water purification is effectual, moreover economy, environmental protection.

Description

A kind of applying biological filters the water cellar purifier of module slowly
Technical field
This utility model relates to a kind of water cellar purifier, especially relates to a kind of applying biological and filters the water cellar purifier of module slowly.
Background technology
Water cellar is widely used in China's southeastern coast and Hill Region of Northwest area as one of principal mode disperseing water supply project.But, although for many years, but the safety problem of water cellar is difficult to be protected always in extensive use.
Current water cellar is primarily present the defect of the following aspects:
(1) water quality of common Jiao Shui is very poor, and wherein COD, total phosphorus, selenium, hydrargyrum, colibacillary content exceed standard.
(2) most water cellars are using disinfection by chlorine, it is easy to produce the disinfection byproduct (DBP) such as haloform, halogen acetic acid and cause secondary pollution.When using plastic cistern, the strong oxidizing property disinfectant such as chlorine also can with water cellar among carbon-carbon double bond react, increase cellar for storing things water content of organics, reduce water cellar service life.
(3) owing to intaking above water cellar, the structure restriction of top water intaking, the water bottom water cellar flows hardly, becomes " stagnant water ", extremely easily cooperating microorganisms.
(4) owing to water inlet is not controlled by water cellar, the animal waste faggot of ground attachment, house refuse, chemical fertilizer, pesticide etc., under rainwash effect, enter water cellar, cause exceeding standard of sensory properties index and toxicologic index, cause that the water quality of water cellar is difficult to ensure that.
Utility model content
In order to solve above-mentioned technical problem, this utility model provides a kind of applying biological to filter the water cellar purifier of module slowly, and this water cellar purifier not only purifying water effect is good, and economy, environmental protection.
The technical solution adopted in the utility model is:
A kind of applying biological filters the water cellar purifier of module slowly, including cellar for storing things body 1 and the water fetching device 2 being positioned at body top, cellar for storing things, also include at least one and be positioned at that cellar for storing things body 1 is internal, biological slow filter module 3 for purifying rainwater, and be positioned at outside the body 1 of cellar for storing things, for discarding first rainwater and follow-up rainwater being supplied to the initial rain flow removing device 4 of cellar for storing things body 1;It is main by filter packing block 31 with for wrapping up and the wire netting housing 32 of fixing filter packing block is constituted that described biology filters module 3 slowly, and described filter packing block 31 is followed successively by active carbon layer 311, fluvial sand filter substrate layer 312, gravel layer 313 from inside to outside;Described initial rain flow removing device 4 includes the neighbouring collecting-tank 41 by middle level dividing plate 43 interval and abandons rain room 42, described middle level dividing plate 43 plate body is provided with through hole 431, through hole 431 is arranged below spacing net 432, and spacing net 432 is built with ball float 433 and is fixed on ball float top and can cover the eliminator plate 434 of through hole.
As preferably, described cellar for storing things body 1 include left and right adjacent by catchment cellar for storing things 11 and the water purification cellar for storing things 12 at body of wall 13 interval;Having through hole hole slot bottom described body of wall 13, described biology is filtered in the hole slot that module 3 is movably set in body of wall 13 slowly;Described initial rain flow removing device 4 connects with cellar for storing things 11 of catchmenting;Described water fetching device 2 is arranged at water purification and stores 12 tops.
As preferably, described in catchment and be provided with the detachable riffler 113 being shaped as concave surface bottom cellar for storing things 11.
As preferably, described in catchment that 11 tops, cellar for storing things are provided with the cellar for storing things cover plate 111 that catchments, inside is provided with the cellar for storing things blow-down pipe 112 that catchments being extended to bottom by top, cellar for storing things of catchmenting;Described water purification is stored 12 tops and is provided with water purification cellar for storing things cover plate 121, inside and is provided with and is stored top by water purification and extend to the water purification cellar for storing things blow-down pipe 122 of bottom.
As preferably, described biology is filtered module 3 inside slowly and is provided with at least two for supporting the support column 33 of the upper and lower bottom surface of wire netting housing 32.
As preferably, described collecting-tank 41 top is provided with the retardance screen 44 covering collecting-tank, and the top of described collecting-tank 41 is horizontally disposed permeable packing layer 411, described in abandon the bottom of rain room (42) be horizontally disposed pervious concrete floor 421;Described collecting-tank 41 arranged outside has the water inlet pipe 45 for rainwater in it is drained to cellar for storing things body 1.
As preferably, the upper side of described middle level dividing plate 43 is provided with covering the water proof trapdoor 435 of through hole 431, and the upper side of one end of water proof trapdoor 435 and middle level dividing plate 43 is rotationally connected.
As preferably, described water fetching device 2 includes the handle 25 that casing 21 draws water for controlling casing;The internal baffle plate 22 with through hole hole slot 221 that is provided with of described casing 21, and in hole slot 221, it is provided with horizontal check valve 222, casing 21 is divided into the adjacent filter vat in left and right 23 and piston sleeve 24 by described baffle plate;Described filter vat 23 upper end is provided with outlet 231, inside is provided with carbon leaching material 232;Described piston sleeve 24 bottom be provided with there is the water inlet 241 of vertical check valve 243, inside is provided with the piston 242 matched with piston sleeve;Rotating casing 21 top of being fixed on of described handle 25, the afterbody of handle 25 is hinged with piston 242.
The beneficial effects of the utility model:
1. initial rain flow removing device of the present utility model, protection water cellar water inlet will not be subject to the interference of large volume impurity, discard the rainfall initial stage carries the low quality rainwater of a large amount of pollutant, collects the rainwater that water quality is higher;Meanwhile, the design of the trapdoor of initial rain flow removing device facilitates peasant household to open or close the through hole for abandoned stream just rain according to practical situation (such as in dry season or to water quality requirement time relatively low), according to self needing to make full use of rainwater, embody the hommization of design;
2. biology of the present utility model considers module slowly, and its advantage is as follows:
(1) the immersion of rainwater with shuttle back and forth under, its internal filter material surface defines one layer of biomembrane being made up of microorganism and algae, this film has the effect that a. oxidative degradation Organic substance: due to the needs of growth among microorganism and algal grown metabolism, oxidizable, degradable Organic substance is resolved into CO2、H2O, assimilates into the protoplasm of microorganism self simultaneously by the partial intermediate produced in degradation process;And the slow rainwater flow velocity filtered in module of biology is relatively low, it is possible to make this effect sufficiently conducted;B. adsorption-flocculation macromole and Organic substance: biomacromolecule or hardly degraded organic substance are existed adsorption-flocculation effect;On filtrate, the biomembrane specific surface area of attachment is relatively big, and energy absorbed portion Organic substance, the stickum of microorganism secretion such as polysaccharide etc. has the effect of similar chemical flocculation;Major part larger molecular organics is adsorbed by biomembrane, reaches the purpose removed;C. machinery sieving rainwater: the biological slow substrate filtering module is quartz sand, is aided with activated carbon, biomembrane;Root it was found that in biological slow filter module microbes biomass be gradually reduced along with water (flow) direction, it is possible to as conventional filtration, play mechanical filter effect.Therefore, rainwater flows through biology and considers module slowly, and under the above-mentioned three layers effect of microorganism, wherein most microorganism and hazardous compound are removed, it is achieved thereby that to rain water purification;
(2) biological slow filter module is with gravel, the quartz sand low material being easy to get of equal value for substrate, with low cost;Use the head difference between dependence water-retention cellar for storing things and water purification cellar for storing things, allow water flow through defecator, it is not necessary to be additionally provided power;Adopt biological slow filter module purifying rainwater, it is not necessary to extra delivering medicament, it is to avoid the generation of secondary pollution in water cellar Water warfare;
3. cellar for storing things of the present utility model body is stored two parts by collecting-tank and water purification and is constituted, and collecting-tank is used for concentrating major pollutants, and water purification cellar for storing things is for storing the water through purifying;Double; two cellars for storing things design at collecting-tank and water purification cellar for storing things, promotes the flowing of water cellar internal water, it is to avoid the appearance of " stagnant water ";Detachable riffler bottom collecting-tank, under not significantly changing the water cellar difficulty of construction premise with the desilting cycle, reduces difficulty and the workload of water cellar desilting;
4. the water fetching device being positioned at top, water purification cellar for storing things of the present utility model, the advantage there is the chance reducing Jiao Shui and extraneous contact, avoiding tradition water cellar water intaking container to enter the pollution that water cellar brings.
The running of this utility model cistern system:
Under first rain segregation apparatus effect, the initial rainfall carrying large number of ground harmful substance is discarded automatically, and all the other rainwater enter collecting-tank.At collecting-tank with under the head difference effect at water purification cellar for storing things, rainwater, by filtering module slowly, utilizes the predation of microorganism in biological slow filter module and biomembranous adsorption, removes major part microorganism and hazardous compound;Manually compression pump is by hydraulic pressure to water fetching device, after filtering purification slowly, it is possible to meet the demand of rural water.
Accompanying drawing explanation
Fig. 1 is overall structure sketch of the present utility model;
Fig. 2 is initial rain flow removing device structural representation of the present utility model;
Fig. 3 is wire netting housing and the support column arrangement schematic diagram of slow filter module of the present utility model;
Fig. 4 is the filter packing block structure schematic diagram of slow filter module of the present utility model;
Fig. 5 is water fetching device structural representation of the present utility model.
In figure: cellar for storing things body 1, cellar for storing things 11 of catchmenting, catchment cellar for storing things cover plate 111, and catchment cellar for storing things blow-down pipe 112, detachable riffler 113, water purification cellar for storing things 12, water purification cellar for storing things cover plate 121, water purification cellar for storing things blow-down pipe 122;Water fetching device 2, casing 21, baffle plate 22, hole slot 221, horizontal check valve 222, filter vat 23, outlet 231, carbon leaching material 232, piston sleeve 24, water inlet 241, piston 242, vertical check valve 243, handle 25;Biological slow filter module 3, filter packing block 31, active carbon layer 311, fluvial sand filter substrate layer 312, gravel layer 313, wire netting housing 32, support column 33;Initial rain flow removing device 4, collecting-tank 41, permeable packing layer 411, abandon rain room 42, pervious concrete layer 421, middle level dividing plate 43, through hole 431, spacing net 432, ball float 433, eliminator plate 434, block screen 44, water inlet pipe 45.
Detailed description of the invention
Below in conjunction with accompanying drawing 1 to 5, the utility model is described in further detail.
Referring to Fig. 1, a kind of applying biological filters the water cellar purifier of module slowly, and apparatus main body is reinforced concrete structure, including: cellar for storing things body 1, water fetching device 2, biological slow filter module 3 and initial rain flow removing device 4.
Flow through the rainwater on ground, through the filtration of retardance screen 44 and permeable packing layer 411, enter collecting-tank 41.Rainwater after initial rainwater discharge, is flowed to cellar for storing things 11 of catchmenting by water inlet pipe 45.Cellar for storing things of catchmenting 11 is designed to a square cylinder, it is detachable riffler 113 by concave design, the silt among cellar for storing things 11 of catchmenting is gathered together, reduce the risk of biological slow filter module 3 blocking, concave design becomes dismountable simultaneously, concave surface entirety can be taken out and clean during desilting.The cellar for storing things cover plate 111 that catchments is arranged at 11 tops, cellar for storing things of catchmenting, and the cellar for storing things blow-down pipe 112 that catchments is goed deep in water by 11 tops, cellar for storing things of catchmenting, it is possible to from upper extraction water sample, convenient maintenance.The water in cellar for storing things 11 that catchments enters biological slow filter module 3 under head difference effect.The water purified through biological slow filter module 3 enters in water purification cellar for storing things 12.Equally, water purification stores 12 tops water purification cellar for storing things cover plate 121 and water purification cellar for storing things blow-down pipe 122, and top also has water fetching device 2, convenient by water purification taking-up.
Referring to Fig. 2, initial rain flow removing device 4 includes the neighbouring collecting-tank 41 by middle level dividing plate 43 interval and abandons rain room 42, middle level dividing plate 43 plate body is provided with through hole 431, through hole 431 is arranged below spacing net 432, and spacing net 432 is built with ball float 433 and is fixed on ball float top and can cover the eliminator plate 434 of through hole.Collecting-tank 41 top is provided with the retardance screen 44 covering collecting-tank, and the top of collecting-tank 41 is horizontally disposed permeable packing layer 411, and the bottom abandoning rain room (42) is horizontally disposed pervious concrete floor 421;Collecting-tank 41 arranged outside has the water inlet pipe 45 for rainwater in it is drained to cellar for storing things body 1.The upper side of middle level dividing plate 43 is provided with covering the water proof trapdoor 435 of through hole 431, and the upper side of one end of water proof trapdoor 435 and middle level dividing plate 43 is rotationally connected.
Retardance screen 44 is netted, is installed on ground, it is possible to dismounting, permeable packing layer 411 is placed among metal or plastic wire, it is possible to together take out with metal or plastic wire.Ball float 433 diameter, slightly larger than through hole 431 diameter, under spacing net 432 limits, can only move up and down.Water inlet pipe 45 is positioned at outside collecting-tank 41.After rainwater collects on the ground, flow into collecting-tank 41 through retardance screen 44, permeable packing layer 411.Under retardance screen 44 effect, the bigger pollutant such as faggot, plastic bag, fallen leaves are blocked on outside device, it is to avoid blocked by device.Permeable packing layer 411 is considered to be worth doing by rubble or brick and is formed, and is placed among metal net mask, plays a role in filtering.The rainfall initial stage, wash away carry a large amount of chemical fertilizer, silt first rainwater either directly through on middle level dividing plate 43 through hole 431 enter abandon rain room 42, enter soil by pervious concrete layer 421, the chemical fertilizer, the pesticide that carry with it are together removed.When rainfall reaches certain value, ball float 433 floats, and on ball float, eliminator plate 434 blocks through hole 431, and rainwater enters, by water inlet pipe 45, cellar for storing things 11 of catchmenting.When the dry season, it is possible to water proof portable plate door 435 is shut and blocks through hole 431, allow institute's rain all collect entrance and catchment cellar for storing things 11.
Referring to Fig. 3 and Fig. 4, biological slow filter module 3 by wire netting housing 32, filter packing block 31 and prevents the support column 33 that wire netting housing 32 deforms from forming.Filter packing block 31 is followed successively by active carbon layer 311, fluvial sand filter substrate layer 312, gravel layer 313 from inside to outside.
Filter packing block 31 is positioned within wire netting housing 32, it is possible to freely take out.Metal net shaped housing 32 adopts plug type to design, and has slideway, biology can be filtered module 3 slowly in the dry season and extract, be carried out, change filtrate on the wall arranging the biological slow both sides filtering module 3.Biological slow filter module 3 is internal fills fluvial sand filter substrate 312, and in order to avoid the grains of sand skid off, wire netting housing 32 mesh diameter should be less than the average diameter of matrix granule.Slowly filter the module 3 position near wire netting housing 32 at biology, arrange that the diameter playing support effect is significantly greater than the gravel 313 of matrix granule.The active carbon layer 311 being made up of activated carbon is added among fluvial sand filter substrate layer 312.Current, under the effect of head difference, filter module 3 slowly by biology, can filter slowly at biology and form one layer of biomembrane being made up of microorganism and algae on the internal filtrate top layer of module 3.Biomembrane is mainly composed of osculum campanularian, ditch campanularian, has rib fibre worm etc..For adapting to the water level of different times, reducing biological slow filter module 3 inner stuffing pressure for outside wire netting housing 32, it is to avoid its deformation, biological slow filter module 3 is designed as brick simultaneously.Time actually used, multiple biologies are filtered module 3 slowly and are stacked together, and composition filters device slowly.Wet season increases the biological slow quantity filtering module 3, reduces the biological slow quantity filtering module 3 dry season.When blocking occurs biological slow filter module 3 internal filtrate, biology is filtered slowly module 3 and extracts among water cellar, scrape off biomembrane, rinse well.
Referring to Fig. 5, water fetching device 2 includes the handle 25 that casing 21 draws water for controlling casing;The internal baffle plate 22 with through hole hole slot 221 that is provided with of casing 21, and in hole slot 221, it is provided with horizontal check valve 222, casing 21 is divided into the adjacent filter vat in left and right 23 and piston sleeve 24 by baffle plate;Filter vat 23 upper end is provided with outlet 231, inside is provided with carbon leaching material 232;Piston sleeve 24 bottom be provided with there is the water inlet 241 of vertical check valve 243, inside is provided with the piston 242 matched with piston sleeve;Rotating casing 21 top of being fixed on of handle 25, the afterbody of handle 25 is hinged with piston 242.
The force (forcing) pump that piston sleeve 24 and piston 242 are constituted can produce bigger pressure under handle 28 controls, and when handle 25 rotates up, the air in piston sleeve 24 is compressed, and vertical check valve 243 is closed, and horizontal check valve 222 is opened, and air is discharged from outlet 231.Handle 25 is rotated down, and vertical check valve 243 is opened, and horizontal check valve 222 is closed, and water enters water fetching device.Handle 25 rotates up again, and vertical check valve 243 is again switched off, and water enters filter vat 23 by horizontal check valve 222, by carbon leaching material 232, purifies for the last time, namely can flow out from intake.When water fetching device 2 is carried out by needs, it is possible to top cover is opened, takes out filter vat 23 and be carried out.When for water quality requirement relatively low time, it is also possible to remove filter vat 23, directly take water purification cellar for storing things 12 inside water.
Specific embodiment described herein is only to this utility model spirit explanation for example.Described specific embodiment can be made various amendment or supplements or adopt similar mode to substitute by this utility model person of ordinary skill in the field, but without departing from spirit of the present utility model or surmount the scope that appended claims is defined.

Claims (8)

1. an applying biological filters the water cellar purifier of module slowly, including cellar for storing things body (1) and the water fetching device (2) being positioned at body top, cellar for storing things, it is characterized in that: also include at least one and be positioned at cellar for storing things body (1) biology internal, for purifying rainwater and filter module (3) slowly, and be positioned at outside, cellar for storing things body (1), be used for discarding first rainwater and follow-up rainwater is supplied to the initial rain flow removing device (4) at cellar for storing things body (1);It is main by filter packing block (31) with for wrapping up and the wire netting housing (32) of fixing filter packing block is constituted that described biology filters module (3) slowly, and described filter packing block (31) is followed successively by active carbon layer (311), fluvial sand filter substrate layer (312), gravel layer (313) from inside to outside;Described initial rain flow removing device (4) includes the neighbouring collecting-tank (41) by middle level dividing plate (43) interval and abandons rain room (42), described middle level dividing plate (43) plate body is provided with through hole (431), through hole (431) is arranged below spacing net (432), and spacing net (432) is built with ball float (433) and is fixed on ball float top and can cover the eliminator plate (434) of through hole.
2. a kind of applying biological according to claim 1 filters the water cellar purifier of module slowly, it is characterised in that: described cellar for storing things body (1) include left and right adjacent by body of wall (13) interval catchment cellar for storing things (11) and water purification cellar for storing things (12);Described body of wall (13) bottom has through hole hole slot, and described biology is filtered module (3) slowly and is movably set in the hole slot of body of wall (13);Described initial rain flow removing device (4) connects with cellar for storing things (11) of catchmenting;Described water fetching device (2) is arranged at (12) top, water purification cellar for storing things.
3. a kind of applying biological according to claim 2 filters the water cellar purifier of module slowly, it is characterised in that: described in catchment cellar for storing things (11) bottom be provided with the detachable riffler (113) being shaped as concave surface.
4. a kind of applying biological according to claim 3 filters the water cellar purifier of module slowly, it is characterised in that: described in catchment cellar for storing things (11) top be provided with catchment cellar for storing things cover plate (111), inside be provided with by catchment cellar for storing things top extend to bottom catchment cellar for storing things blow-down pipe (112);(12) top, described water purification cellar for storing things is provided with water purification cellar for storing things cover plate (121), inside is provided with water purification cellar for storing things blow-down pipe (122) being extended to bottom by top, water purification cellar for storing things.
5. a kind of applying biological according to claim 1 and 2 filters the water cellar purifier of module slowly, it is characterised in that: described biology is filtered module (3) inside slowly and is provided with at least two for supporting the support column (33) of wire netting housing (32) upper and lower bottom surface.
6. a kind of applying biological according to claim 1 and 2 filters the water cellar purifier of module slowly, it is characterized in that: described collecting-tank (41) top is provided with the retardance screen (44) covering collecting-tank, the top of described collecting-tank (41) is horizontally disposed permeable packing layer (411), described in abandon the bottom of rain room (42) be horizontally disposed pervious concrete floor (421);Described collecting-tank (41) arranged outside has the water inlet pipe (45) for rainwater in it is drained to cellar for storing things body (1).
7. initial rain flow removing device according to claim 6, it is characterized in that: the upper side in described middle level dividing plate (43) is provided with covering the water proof trapdoor (435) of through hole (431), and the upper side of one end of water proof trapdoor (435) and middle level dividing plate (43) is rotationally connected.
8. a kind of applying biological according to claim 1 and 2 filters the water cellar purifier of module slowly, it is characterised in that: described water fetching device (2) includes casing (21) for controlling the handle (25) that casing draws water;Described casing (21) is internal is provided with the baffle plate (22) with through hole hole slot (221), and is provided with horizontal check valve (222) in hole slot (221), and casing (21) is divided into the adjacent filter vat in left and right (23) and piston sleeve (24) by described baffle plate;Described filter vat (23) upper end is provided with outlet (231), inside is provided with carbon leaching material (232);Described piston sleeve (24) bottom is provided with the water inlet (241) with vertical check valve (243), inside is provided with the piston (242) matched with piston sleeve;Rotating casing (21) top of being fixed on of described handle (25), the afterbody of handle (25) is hinged with piston (242).
CN201620024783.1U 2016-01-12 2016-01-12 Use biological water cellar purifier of module that strains slowly Expired - Fee Related CN205382008U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106396284A (en) * 2016-11-24 2017-02-15 河海大学 Sewage treatment device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106396284A (en) * 2016-11-24 2017-02-15 河海大学 Sewage treatment device
CN106396284B (en) * 2016-11-24 2019-04-30 河海大学 A kind of sewage-treatment plant

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