CN105217780B - A kind of self-cleaning fluidized bed bio filter for sea-farming - Google Patents
A kind of self-cleaning fluidized bed bio filter for sea-farming Download PDFInfo
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- CN105217780B CN105217780B CN201510746273.5A CN201510746273A CN105217780B CN 105217780 B CN105217780 B CN 105217780B CN 201510746273 A CN201510746273 A CN 201510746273A CN 105217780 B CN105217780 B CN 105217780B
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a kind of self-cleaning fluidized bed bio filter for sea-farming, including cylinder, and bed expansion area and suspension settling zone are provided with the inside of the cylinder；Filtrate is filled with the bed expansion area, self-cleaning component and automatic detection component are installed above bed expansion area, self-cleaning component is used to clean the suspension of filter material surface, and once purged filtrate reenters bed expansion area；The automatic detection component is used to control self-cleaning component.Suspension settling zone is located at the top of self-cleaning component, and the suspension that self-cleaning components apart comes out reaches suspension settling zone behind bed expansion area, discharged after precipitation.
Description
Technical field
The present invention relates to field of marine aquaculture, specifically, is related specifically to a kind of self-cleaning stream for sea-farming
Change bed biofiltration device.
Background technology
With the fast development of modern agriculture, the marine fish culture industry such as flounder flounder class is just gradually grown, due to the industry
By region, water source, the limitation of temperature, industry size is never formed.Circulating water cultivation pattern because its have efficiently, can
The advantages that control, water saving save ground, do not limited by geographical environment, is just gradually promoted and answers in culture fishery all over the world
With being one of Main way of following culture fishery sustainable development.In circulating water culture system, biofilter is core
Unit for treating water, using the microorganism on filler surface in filter by nitration reaction come ammonia nitrogen, nitrous in degrading cultivation water
The nutritive salt such as nitrogen, COD or organic matter, and then the purpose to purify water, to ensure the normal growth of fish.
The domestic biofilter being used in circulating water culture system mainly has fixed bed biofilter and moving bed life at present
Thing filter, the filler of use has stereo-elastic fiber, biochemistry felt, modified suspending filler and activated carbon etc., frequently with natural membrane
Method and inoculation Spawn incubation method carry out bio-film colonization culture, and the startup time of its biofilter is universal longer, particularly in low temperature
Under operating mode, in general biofilter generally existing starts cycle length, the problems such as treatment effect is undesirable.And conventional fluidization bed is biological
Filter has that bed expansion is too fast in the process of running because its structure is not reasonable, and the filtrate in filter is volatile, and internal flow state is not
The problems such as homogeneous, and then have impact on the high efficiency and stability of device.
In summary, the problem of existing same device is present is as follows：
It is easier to form dead angle area 1. current conventional fluidization bed biofilter is operationally internal, causes fluidised form heterogeneity,
Reduce the mass transfer effect of water mesostroma and filler, and then have impact on the efficiency of device water process.
2. conventional fluidization bed biofilter is operationally due to increasing without self-stripping unit, the easily attachment of top layer filtrate
Therefore suspension, the weight of filtrate lighten, so as to which bed expansion highly becomes more and more higher, cause filterins media run-off phenomenon occur,
And then it have impact on the treatment effeciency of device.
3. packing specific area in traditional biological filter is not universal high, the filler surface of unit volume can not be adhered to abundant
Biocoene, and then have impact on the water treatment efficiency of device.
4. traditional biological filter carries out the startup of filter frequently with natural membrane mode, this method, which exists, starts time length,
The problems such as being not easy to be inoculated with successfully, the problems such as filter treatment effeciency is low, and operational effect is unstable is caused, and then have impact on recirculated water and support
Grow the efficiency of system operation.
The content of the invention
It is an object of the invention to for deficiency of the prior art, there is provided a kind of self-cleaning for sea-farming fluidizes
Bed biofiltration device, to solve the above problems.
Technical problem solved by the invention can be realized using following technical scheme：
A kind of self-cleaning fluidized bed bio filter for sea-farming, including cylinder, in the inside of the cylinder
Provided with bed expansion area and suspension settling zone；
The bottom in the bed expansion area is provided with the annular cloth water chamber for intaking, and is set in the bottom of the annular cloth water chamber
Have the annular water distribution gap connected with bed expansion area, be filled with filtrate in bed expansion area, the bed expansion area it is upper
Side is provided with self-cleaning component, and the self-cleaning component includes suction tube, delivery pipe, water pump and mixing arrangement, the suction tube
For sucking filtrate, suction tube is connected by delivery pipe with water pump, suspension of the impeller inside the water pump to filter material surface
Carry out after removing for the first time, then the filtrate is imported in mixing arrangement, spiral blade is provided with the mixing arrangement, it is used
Secondary removal is carried out in the suspension to filter material surface, the outlet of the mixing arrangement connects with annular cloth water chamber；
Automatic detection component is also installed in the bed expansion area, the automatic detection component include data acquisition module,
Radio-frequency guide-admission object-position switch and water pump control modules；Radio-frequency guide-admission object-position switch is installed on the lower section of suction tube, radio frequency admittance admittance
The signal output part of bit switch is connected with water pump control modules, and radio-frequency guide-admission object-position switch is detected in real time by data acquisition module
Filtrate height and water pump control modules are sent in bed expansion area, and it is high that the water pump control modules internal memory contains filtrate setting
Degree, after water pump control modules receive the filtrate height of radio-frequency guide-admission object-position switch transmission, itself and filtrate setting height are carried out
Compare, if filtrate is highly more than filtrate setting height, water pump control modules start water pump；
The suspension settling zone is located at the top of self-cleaning component, and the suspension that self-cleaning components apart comes out is through bed
Reach suspension settling zone behind breathing space, the suspension settling zone includes precipitation cavity, and annular gear is provided with cavity is precipitated
Plate, the ring baffle are located at bed expansion area exit, and ring baffle and the outer wall in bed expansion area form downward runner,
Annular settling zone is provided with the exit of the downward runner, annular settling zone has the sewage draining exit for being used for discharging suspension,
The annular settling zone and upward flow passage, delivery port is provided with the end of upward runner.
Further, annular cloth water chamber is provided with the lateral wall of bed expansion area bottom,
Annular cloth water chamber, water inlet direction and the annular of the water inlet are provided with the lateral wall of bed expansion area bottom
The tangential direction of cloth water chamber is identical；The annular water distribution gap that water flows through annular cloth water chamber bottom enters bed expansion area, in taper
Strong rotation upper up-flow is produced in the presence of water distributing plate, and then drives the upward expansion of filtrate.
Further, the suction tube include centrally located acrylic cylinder and radially distribute and with
Some acrylic pipes of the acrylic cylinder connection, gap, the seam are left in the bottom of some acrylic pipes
Gap is used to suck filtrate.
Further, the filtrate uses spherical glass beads of the diameter range for 0.2-0.3mm.
Further, the water pump uses timing mode, and water pump is after water pump control modules provide signal enabling, meter
Evaluation time, after setting time is reached, water pump control modules control water pump is stopped, if now filtrate height is also above setting
Fixed height, then continue the water pump action of next period, if filtrate height waits next secondary control already below setting height
Signal processed is again started up.
Further, the outlet of the mixing arrangement reaches taper water distributing plate through annular cloth water chamber, the mixing arrangement
The entrance of outlet and fluidized bed bio filter water inlet is located at the both sides of annular cloth water chamber, and both line angles respectively
In 180 °.
Compared with prior art, beneficial effects of the present invention are as follows：
1st, the present apparatus uses filler of the glass microballoon as filter, particle diameter 0.2-0.3mm, and its specific surface area is up to
10000m2/m3, can be grown for microorganism and sufficiently large specific surface area is provided, beneficial to the attachment and breeding of microorganism.This filtrate compared with
Traditional filtrate quartz sand has more wearability and intensity, and homogeneity is preferable, beneficial to the high turbulent extent for forming solid liquid phase, to carry
The mass transfer between water body mesostroma and microorganism is risen, and then promotes the operating efficiency of filter.
2nd, the present apparatus controls the irregular unlatching of water pump by radio-frequency guide-admission object-position switch, and level switch passes through data acquisition
The measured signal of module collection, when the height of filtrate meets or exceeds setting value, system output control signal, starts water
Pump.Which can realize the stabilization of bed expansion height.
3rd, inhale filtering device to be positioned at bed setting height, water pump is by top layer filtrate from each radial steel pipe bottom
Suction, then into a mixing arrangement.This kind, which inhales filtering device, equably to be sucked the filtrate on most top layer, in mixing arrangement
In by the rubbing action with blade, not remove only the blocked up suspension of filter material surface, also achieve the recycling of filtrate.
4th, the filtrate for being sucked top layer by water pump enters annular cloth water chamber in a tangential manner, and its water inlet angle enters with device
For water angle into 180 degree, which can promote the original rotary water current of filter, avoid unidirectional water inflow and dead angle area etc. occur and ask
Topic, and then optimize the fluidised form inside filter.
5th, there is precipitation zone at the top of device, can be by self-stripping unit because the Domain Volume lower part region becomes big suddenly
The suspension of removal precipitates, and is discharged it by sewage draining exit outside filter.
6th, the present apparatus is rational in infrastructure, and highly effective, floor space is few, and NH_3-N treating load is high, and permits in environmental condition
Perhaps sufficiently large filter can be designed in the case of to meet the needs of system bearing amount.
7th, under seawater oligotrophic operating mode, the present apparatus can be realized quick under cryogenic by way of being inoculated with former filtrate
Bio-film colonization, and can efficiently remove the nutritive salt such as the ammonia nitrogen in sea farming system.
Brief description of the drawings
Fig. 1 is the structural representation of self-cleaning fluidized bed bio filter of the present invention.
Fig. 2 is the schematic diagram of self-cleaning fluidized bed bio filter of the present invention.
Fig. 3 is the schematic diagram of suction tube of the present invention.
Fig. 4 is of the present invention from the control flow chart for washing down component.
Fig. 5 is the structural representation of the annular cloth water chamber of the present invention.
Label declaration in figure：Cylinder 1, bed expansion area 2, suspension settling zone 3, taper water distributing plate 4, annular cloth water chamber 5,
Water inlet 6, filtrate 7, suction tube 8, delivery pipe 9, water pump 10, mixing arrangement 11, acrylic cylinder 12, acrylic pipe 13, seam
Gap 14, ring baffle 15, annular settling zone 16, sewage draining exit 17, delivery port 18, water inlet entrance 19, mixing arrangement outlet
20th, annular water distribution gap 21.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, the present invention is expanded on further.
Referring to Fig. 1 and Fig. 2, a kind of self-cleaning fluidized bed bio filter for sea-farming, including cylinder 1,
The inside of the cylinder 1 is provided with bed expansion area 2 and suspension settling zone 3.
The bottom in the bed expansion area 2 is provided with the taper water distributing plate 4 for intaking, the bottom of bed expansion area 2
Annular cloth water chamber 5, annular water distribution gap 21 and bed expansion of the bottom through bottom of the annular cloth water chamber 5 are provided with lateral wall
Area 2 connects, and the other end of annular cloth water chamber 5 is set to water inlet 6, the water inlet direction of the water inlet 6 and cutting for annular cloth water chamber 5
Line direction is identical, for producing strong rotary water current.
The annular water distribution gap connected with bed expansion area 2 is provided with the annular bottom of cloth water chamber 5, in bed expansion area
Filtrate 7 is filled with 2, the top in the bed expansion area 2 is provided with self-cleaning component, and the self-cleaning component includes suction tube
8th, delivery pipe 9, water pump 10 and mixing arrangement 11.Referring to Fig. 3, the suction tube 8 includes centrally located acrylic cylinder
12 and some acrylic pipes 13 for radially distributing and being connected with the acrylic cylinder 12, at described some sub- grams
Gap 14 is left in the bottom of power pipe 13, and the gap 14 is used to suck filtrate 7.Suction tube 8 is connected by delivery pipe 9 and water pump 10
It is logical, after the impeller water pump 10 inside carries out removal for the first time to the suspension on the surface of filtrate 7, then the filtrate 7 imported mixed
Attach together and put in 11, spiral blade is provided with the mixing arrangement 11, the suspension progress that it is used for the surface of filtrate 7 is secondary
Remove.
Referring to Fig. 5, the outlet 20 of the mixing arrangement reaches bed expansion area 2, the entrance of water inlet through annular cloth water chamber 5
19 reach bed expansion area through annular cloth water chamber, and the outlet 20 of the mixing arrangement and the outlet 19 of water inlet are respectively positioned at annular
The both sides of cloth water chamber, and both line angles are in 180 °.
Referring to Fig. 4, automatic detection component is also installed in the bed expansion area 2, the automatic detection component includes data
Acquisition module, radio-frequency guide-admission object-position switch and the control module of water pump 10；Radio-frequency guide-admission object-position switch is installed under suction tube 8
Side, the signal output part of radio-frequency guide-admission object-position switch are connected with the control module of water pump 10, and radio-frequency guide-admission object-position switch passes through data
Acquisition module detects the height of filtrate 7 in bed expansion area 2 and is sent to the control module of water pump 10 in real time, and the water pump 10 controls mould
Block internal memory contains the setting height of filtrate 7, and the control module of water pump 10 receives the height of filtrate 7 of radio-frequency guide-admission object-position switch transmission
Afterwards, by it compared with the setting height of filtrate 7, if the height of filtrate 7 is more than the setting height of filtrate 7, the control module of water pump 10
Start water pump 10.
The suspension settling zone 3 is located at the top of self-cleaning component, and the suspension that self-cleaning components apart comes out is through bed
Reach suspension settling zone 3 behind layer breathing space 2, the suspension settling zone 3 includes precipitation cavity, ring is provided with cavity is precipitated
Shape baffle plate 15, the ring baffle 15 are located at the exit of bed expansion area 2, ring baffle 15 and the outer wall structure in bed expansion area 2
Into downward runner, annular settling zone 16 is provided with the exit of the downward runner, annular settling zone 16, which has, to be used to arrange
Go out the sewage draining exit 17 of suspension, the annular settling zone 16 and upward flow passage, be provided with out in the end of upward runner
The mouth of a river 18.
Device of the present invention always high 1.4m, 3 high 0.5m of upper part suspension settling zone, a diameter of 0.65m, lower part bed
Layer 2 high 0.9m of breathing space, a diameter of 0.4m.A diameter of 0.3mm bead is put into a device as filtrate 7, designs bed
Expansion rate 50%.The ripe bead of the biofilm of the former volume of filtrate 10% is added, now bed elemental height is 0.55m, when
During the plant running, bed expansion height to 0.8m or so.The equipment of suction strainer material 7 is placed in the top of filtrate 7 of expansion, i.e., is highly
At 0.8m.One radio-frequency guide-admission object-position switch is housed in its lower section.
The flow of inlet water of device of the present invention is 5m3/ h, annular cloth water chamber 5 is tangentially entered by water inlet 6, along annular cloth
The annular water distribution gap of water cavity bottom enters the present apparatus, and current pass through bed expansion area 2 and annular settling zone 16 successively, finally by
Delivery port 18 flows out the present apparatus.Because the annular domain volume of settling zone 16 becomes big suddenly, therefore water velocity slows down, due to ring baffle
15 effect, the particulate matter in waste water can be precipitated.Now the expansion height of bed is about 0.8m, is filtered in fluidized bed bio
During device biofilm, water pump 10 periodically automatically turns on, and designs and was opened every 1 hour 5 minutes, the filtrate 7 for being constantly inoculated with top layer
Mixed with the filtrate 7 of bottom, in the mutual collision of filtrate 7, mature microorganism can be attached to the new table of filtrate 7
Face, and then the breeding and growth of microorganism are accelerated, it can significantly shorten the startup time of biofilter.Biofilter biofilm is ripe
Afterwards, starting module control system, when at bed expansion high level expansion to 0.8m, automatic start water pump 10, by the filtrate 7 on top layer
It is pumped into and is first pumped into blender, enter back into the annular cloth water chamber 5 of bottom of device, and then control the expansion height of bed, maintains
It is efficient and stably when the present apparatus is run.
By taking the cultivating wastewater purification of turbot circulating water culture system as an example, cultivation water water temperature is 18 DEG C, ammonia nitrogen
0.65mg/L, nitrite 0.14mg/L, COD15mg/L, dissolved oxygen 6.95mg/L.The biofiltration of system is used as using the present apparatus
Equipment, using flow as 5m3/ h enters the present apparatus, runs the device after 15 days, its filter material surface color substantially deepens, and is swept by retouching
Electron microscopic observation, filter material surface have abundant microorganism attachment, and now water outlet nitrous nitrogen concentration, which is substantially less than, intakes, and illustrates that device is hung
Film success.After the present apparatus successfully starts up, the continuous monitoring experiment of 2 months shows that bed height is stable at 0.8m always, internal
Fluidised form is good, and filtrate expansion is uniform.By scanning electron microscopic observation, the average organism film thickness of filtrate is 0.05mm, and the thickness is filtered
Expect that the matrix mass transfer effect in the microorganism and water on surface is preferable, microorganism well-grown.The average ammonia nitrogen concentration 0.22mg/ of water outlet
L, average removal rate 66.2%；Average nitrite concentration 0.007mg/L, average removal rate 95%；Average COD concentration 7mg/L,
Average removal rate 53.3%.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of self-cleaning fluidized bed bio filter for sea-farming, including cylinder, it is characterised in that：In the cylinder
The inside of body is provided with bed expansion area and suspension settling zone；
The bottom in the bed expansion area be provided with for intake annular cloth water chamber, the bottom of the annular cloth water chamber be provided with
The annular water distribution gap of bed expansion area connection, filtrate, the top peace in the bed expansion area are filled with bed expansion area
Equipped with self-cleaning component, the self-cleaning component includes suction tube, delivery pipe, water pump and mixing arrangement, and the suction tube is used for
Filtrate is sucked, suction tube is connected by delivery pipe with water pump, and the impeller inside the water pump is carried out to the suspension of filter material surface
It is first remove after, then the filtrate imported in mixing arrangement, spiral blade is provided with the mixing arrangement, it is used for pair
The suspension of filter material surface carries out secondary removal, and the outlet of the mixing arrangement connects with annular cloth water chamber, once purged filter
Material reenters bed expansion area；
Automatic detection component is also installed, the automatic detection component includes data acquisition module, radio frequency in the bed expansion area
Admittance level switch and water pump control modules；Radio-frequency guide-admission object-position switch is installed on the lower section of suction tube, and radio frequency admittance material level is opened
The signal output part of pass is connected with water pump control modules, and radio-frequency guide-admission object-position switch detects bed in real time by data acquisition module
In breathing space filtrate height and be sent to water pump control modules, the water pump control modules internal memory contains filtrate setting height, water
After pump control module receives the filtrate height of radio-frequency guide-admission object-position switch transmission, by it compared with filtrate setting height,
If filtrate is highly more than filtrate setting height, water pump control modules start water pump；
The suspension settling zone is located at the top of self-cleaning component, and the suspension that self-cleaning components apart comes out is through bed expansion
Reach suspension settling zone behind area, the suspension settling zone includes precipitation cavity, ring baffle, institute are provided with cavity is precipitated
State ring baffle and be located at bed expansion area exit, ring baffle and the outer wall in bed expansion area form downward runner, in institute
The exit for stating downward runner is provided with annular settling zone, and annular settling zone has the sewage draining exit for being used for discharging suspension, described
Annular settling zone and upward flow passage, delivery port is provided with the end of upward runner.
2. the self-cleaning fluidized bed bio filter according to claim 1 for sea-farming, it is characterised in that：Institute
State and annular cloth water chamber is provided with the lateral wall of bed expansion area bottom, the water inlet direction of the water inlet and cutting for annular cloth water chamber
Line direction is identical；The annular water distribution gap that water flows through annular cloth water chamber bottom enters bed expansion area, in the work of taper water distributing plate
Strong rotation upper up-flow is produced with lower, and then drives the upward expansion of filtrate.
3. the self-cleaning fluidized bed bio filter according to claim 1 for sea-farming, it is characterised in that：Institute
Stating suction tube includes centrally located acrylic cylinder and radially distributes and connected with the acrylic cylinder
Some acrylic pipes, gap is left in the bottom of some acrylic pipes, and the gap is used to suck filtrate.
4. the self-cleaning fluidized bed bio filter according to claim 1 for sea-farming, it is characterised in that：Institute
State the spherical glass beads that filtrate uses diameter range as 0.2-0.3mm.
5. the self-cleaning fluidized bed bio filter according to claim 1 for sea-farming, it is characterised in that：Institute
State water pump and use timing mode, water pump calculates the time after water pump control modules provide signal enabling, when reaching setting
Between after, water pump control modules control water pump be stopped, if now filtrate height be also above setting height, continue next
The water pump action of period, if filtrate height waits next secondary control signal to be again started up already below setting height.
6. the self-cleaning fluidized bed bio filter according to claim 2 for sea-farming, it is characterised in that：Institute
The outlet for stating mixing arrangement reaches taper water distributing plate through annular cloth water chamber；The outlet of the mixing arrangement and fluidized bed bio filtering
The entrance of device water inlet is located at the both sides of annular cloth water chamber respectively, and both line angles are in 180 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510746273.5A CN105217780B (en) | 2015-11-05 | 2015-11-05 | A kind of self-cleaning fluidized bed bio filter for sea-farming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510746273.5A CN105217780B (en) | 2015-11-05 | 2015-11-05 | A kind of self-cleaning fluidized bed bio filter for sea-farming |
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| CN105217780B true CN105217780B (en) | 2017-12-01 |
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| CN106219738B (en) * | 2016-09-18 | 2019-04-02 | 中国水产科学研究院渔业机械仪器研究所 | Filler and its biomembrane cultural method for fluidized bioreactor |
| CN108164081A (en) * | 2016-12-07 | 2018-06-15 | 北京有色金属研究总院 | A kind of lead-zinc smelting waste acid purifying treatment method |
| CN106587333A (en) * | 2017-01-04 | 2017-04-26 | 张家港纽艾农业科技有限公司 | Expanded bed bioreactor |
| CN106746344A (en) * | 2017-01-04 | 2017-05-31 | 张家港纽艾农业科技有限公司 | Fish and vegetable symbiotic system |
| CN108117233B (en) * | 2017-12-15 | 2020-06-02 | 中国水产科学研究院渔业机械仪器研究所 | A integration water treatment facilities for sturgeon is bred |
| CN113666524B (en) * | 2021-09-03 | 2022-12-09 | 天津市政工程设计研究总院有限公司 | Two-phase adsorption tank for activated coke adsorption process |
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| CN201356993Y (en) * | 2009-02-20 | 2009-12-09 | 山东省高密蓝天节能环保科技有限公司 | Self-cleaning sand drift filter |
| CN101700946B (en) * | 2009-11-19 | 2011-12-21 | 中国水产科学研究院渔业机械仪器研究所 | Integrated treatment device for filtering and purifying water |
| JP5632779B2 (en) * | 2011-03-15 | 2014-11-26 | 水野ストレーナー工業株式会社 | Backwash type filtration device |
| CN202482135U (en) * | 2012-03-21 | 2012-10-10 | 谭明 | Circulation self-cleaning carrier biological filtration reactor |
| CN103908811A (en) * | 2013-01-04 | 2014-07-09 | 扬州龙华环境工程有限公司 | Self-cleaning quick sand filter |
| CN203417504U (en) * | 2013-08-01 | 2014-02-05 | 山东立德环境工程有限公司 | Continuous sand filter |
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