CN102344174B - Filter for sea water desalination pretreatment - Google Patents
Filter for sea water desalination pretreatment Download PDFInfo
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- CN102344174B CN102344174B CN 201010245901 CN201010245901A CN102344174B CN 102344174 B CN102344174 B CN 102344174B CN 201010245901 CN201010245901 CN 201010245901 CN 201010245901 A CN201010245901 A CN 201010245901A CN 102344174 B CN102344174 B CN 102344174B
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Abstract
The invention relates to a filter for a pretreatment technology of sea water desalination. Sea water corrosion resistant antiseptic is added into filter concrete; a concrete interior surface contacting with sea water is coated with sea water resistant anticorrosive paint; steel bar in the concrete is provided with steel bar rust remover; metal pieces contacting with sea water in the filter are made of high alloy duplex stainless steel S32205 (ASTM); non-metallic materials comprise sea water corrosion resistant FRP glass fiber reinforced plastic, ABS engineering plastic and EPDM rubber, etc. Durability of the filter is enhanced; air water back washing and surface sweep washing are employed by the filter to realize a good back washing effect; technical breakthrough in filter material selection is realized by employing a double layer filter material, which has strong dirt containing ability, and quality of water outlet from the filter is improved substantially; during air water back washing, electric draining gate valve is closed, so as to realize high speed backwashing, short backwashing time, long backwashing period, small water consumption and avoid loss of filter material during backwashing. The filter has a high degree of automatic operation and is convenient for management; besides, a civil structure is simple in order to save capital construction investment and facilitate construction.
Description
Technical field
The present invention relates to the filter tank that a kind of sea water desaltination pre-treatment is used.
Background technology
Sea water desaltination also claims " sea water desalinization ", namely removes salinity in the seawater to obtain the technological process of fresh water.Sea water desaltination is the increment technique of increasing income that realizes the water resources utilization, can increase the fresh water total amount, and not be subjected to space-time and weather effect.Water quality is good, price is gradually reasonable, can ensure coastal Drinking Water for Residents and process water demand.
The in recent years in the world target of sea water desaltination forward high efficiency, low energy and mass-producing development, reverse osmosis (SWRO), multistage flash evaporation (MSF) and multiple-effect evaporation (MED) more become the main flow that is applicable to large-scale desalination technology.
An often very complicated systems engineering of large-scale sea water desaltination project.With regard to main processes, comprise sea water preprocessing, desalination (desalination), desalination water aftertreatment etc.Wherein pre-treatment refers to before seawater has entered the device of desalination function its necessity of doing be processed, and as killing except marine life, reduce turbidity, remove suspended substance (to reverse osmosis method), or degassed (to distillation method), add necessary medicament etc.The pre-processing device that adopts has flocculation sedimentation tank, filter tank, UF, MF etc. usually; Desalination then is to remove salinity in the seawater by above-listed a certain method, it is the core of whole desalination system, this process often needs the anticorrosion of the equipment that solves and antiscale problem except requiring efficient desalination, also require to have corresponding energy recovery measure in some technique; Aftertreatment then is the product water to different desalination methods, the processing such as the regulating and controlling water quality that carries out for different customer requirements and storing.
There is multiple pattern in the filter tank of conventional water treatment process, and is the widest as the conventional rapid filter use of filtrate with quartz sand.But be exclusively used in the filter tank of sea water desaltination preprocessing process also seldom.Because the singularity of desalting environment, himself special requirement need to be satisfied in the filter tank that is used for sea water desaltination.In order to overcome the deficiencies in the prior art, be necessary to develop the particular requirement that sea water desaltination is satisfied in special-purpose filter tank.
Summary of the invention
In order to fill up the blank of existing filter tank technology, the invention provides a kind of novel sea water desalinization pre-treatment and use the filter tank.This filter tank has solved the endurance issues of structures and material in the corrosive environment of sea water; The gas, the water dispenser problem of non-uniform that often run in the production run have been solved; Solved filter plate filter beam out-of-level, the phenomenon such as the filter plate seam crossing is poorly sealed; Solved air water distribute in the canal can't scarfing cinder, can't observe the problem of filter plate bottom situation; Filter tank discharge channel drainage pattern is innovated, and by control draining electric brake plate valve, the high speed backwash, backwashing time is short, the recoil cycle is long, water loss is few during back flushing, can not occur filtrate during back flushing and run off and run the sand phenomenon; The filter tank adopts air-water backwashing to add surface sweep washing, and backwash effect is good; There is new technical breakthrough the selection of filtering material aspect, adopts double-layer filter material, and it is strong that filtrate contains dirty ability, and the filter tank effluent quality obviously improves.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of filter for sea water desalination pretreatment is characterized in that: the RMA sanitas that adds seawater corrosion resistance in the filter tank main body reinforced concrete structure, concrete; With the contacted concrete internal surface of seawater, the protective system of brushing sea water resistance; Reinforcing bar brushing reinforcing bar rust remover in the concrete; Metalwork with contact with sea water in the pond all adopts high alloy duplex stainless steel S32205, and non-metallic material adopt FRP glass filament reinforced plastics, ABS engineering plastics or EPDM elastomeric material.
Aforesaid filter for sea water desalination pretreatment is characterized in that: the long-width ratio of filter tank planar dimension is: long: wide=4: 1～3.5: 1, the length in filter tank is greater than 11 meters.
Aforesaid filter for sea water desalination pretreatment is characterized in that: the individual layer homogeneous filtering material adopts quartz sand; Double-layer filter material adopts haydite and quartz sand; Former water is subject to little pollution, contains TOC when high, uses the granulated active carbon filtrate.
Aforesaid filter for sea water desalination pretreatment is characterized in that: a highly suitable space should be arranged between at the bottom of filter plate and the pond, and the height design in described space is 0.85～0.95 meter.
Aforesaid filter for sea water desalination pretreatment is characterized in that: the lateral error of filter plate is between ± 2 millimeters; Full pond filter plate face lateral error is between ± 5 millimeters.
Aforesaid filter for sea water desalination pretreatment is characterized in that: jet is designed to half submerged jet, and center, distributing trough bottom transverse surface sweep washing hole absolute altitude is than the low 0.8～1.2cm of back flushing water level.
Aforesaid filter for sea water desalination pretreatment is characterized in that: a sealing manhole is arranged on the discharge channel base plate.
A kind of filter for sea water desalination pretreatment, the filter tank main body adopts reinforced concrete structure.Because the filter tank is inner, the outside all is in the corrosive properly media environment, and concrete and inner reinforcing bar are had corrodibility.For improving the filter tank weather resistance, in concrete, add the RMA sanitas of seawater corrosion resistance; With the contacted concrete internal surface of seawater, the protective system of brushing sea water resistance; Reinforcing bar brushing reinforcing bar rust remover in the concrete; Metalwork with contact with sea water in the pond all adopts high alloy duplex stainless steel S32205 (ASTM), and non-metallic material adopt the material of the seawater corrosion resistances such as FRP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber.
Flow characteristics according to fluid, when guaranteeing back flushing plane, filter tank gas, water dispenser evenly, the long-width ratio of filter tank planar dimension is: long: wide=4: 1～3.5: 1 (width does not comprise that air water distributes canal, and it is 0.7～0.9 meter that air water distributes the width of the channel degree).The length in filter tank is not less than 11 meters.
When work in the filter tank,, overflow across crest of weir and enter distributing trough through side opening again by intaking total canal behind water inlet electric brake plate valve until drainage.Treat that drainage by distributing trough bottom transverse surface sweep washing hole and the overflow weir overflow of groove top, evenly enters the filter tank.According to the filter tank influent quality from effluent quality is required different, can select individual layer homogeneous filtering material or bilayer, multilayer filtrate, also can change the filtrate in the filtering layer.General individual layer homogeneous filtering material is to adopt quartz sand (or haydite); Double-layer filter material is haydite and quartz sand (hard coal or quartz sand).The influent quality poor (Ru Yuanshui is subject to little pollution, contains TOC when higher) when the filter tank, the filtrates such as available granulated active carbon displacement hard coal.The filter tank treats that drainage passes filter material layer, supporting layer and strainer head through gravity leakage and flows into bottom space.The strainer head material is the ABS engineering plastics.The long 28.5cm of filter; 36 in slit is arranged on the filter cap; Ф 2mm pore is arranged at filter handle top, and long 65mm, wide 1mm bar seam are arranged at the bottom; Filter is evenly distributed on the filter plate, arranges 48～56 for every square metre.Filter plate, filter beam are Prefabricated reinforced concrete spare.Filter plate is made rectangle, and the length of side is no more than 1.2m.Water is in the water distribution square hole imports gas, water dispenser canal after the filter of bottom space, flow into clean water basin by trapped well, effluent weir, clear water canal in the piping lane at last, filtering velocity is selected in 6～20m/h scope, changes automatic adjusting water outlet purge valve open degree depending on raw water quality and realizes permanent head constant speed filter.
The equalization of pressure of any point below the filter plate during in order to ensure back flushing, and the air that filter plate is pushed down into can form an air cushion layer as early as possible should have a highly suitable space between at the bottom of filter plate and the pond.We are the height design of bottom space below the filter plate 0.85～0.95 meter.This highly is enough to make hole and the seam of air by strainer head to be mixed fully and be evenly distributed on the area of whole filter tank, thereby has guaranteed the normal drainage work in filter tank and the regeneration effect of filter back washing.Adopt 905 seam special seal gums (in cement: sand: 905 glue=ratio was mixed with 905 mortars in 1: 1: 0.5) that between the filter plate and the slit between filter plate and the pool wall is sealed.Guaranteed water-tight gastight sealing property.Guarantee the quality of filter tank gas, water backwashing, most critical must strictly be controlled making and the installation of filter plate filter beam, and the lateral error of filter plate is between ± 2 millimeters; Full pond filter plate face lateral error is between ± 5 millimeters.Only have filter plate, the filter Liangping whole, strainer head is in fact also just smooth.Be making and the installation quality of control filter plate filter beam, filter plate and filter beam are made prefabricated component.At precasting yard, elaborate filter plate, filter beam with steel die, reinforcing bar and concrete, guarantee levelness and the filter plate thickness of single-piece filter plate, filter beam, and it is carried out maintenance, hold that quality first closes.Make whole pond filter plate face levelness high, crucial installing at the filter beam.We will install the embedded iron parts used of filter beam and be embedded in accurately and smoothly Chi Dishang, then at DN100 steel short tube of this piece embedded iron parts weldering, embedded iron parts below prefabricated filter beam welds a DN80 steel pipe again, the DN80 steel pipe is inserted in the DN100 steel pipe, use the spirit-leveling instrument levelling, after the level adjustment, again pipe is welded in aggregates.Then make mould with the DN200 pipe, sand-cement slurry is poured in the mould, make to form layer protecting film in the outside of DN100, DN80 pipe and prevent that the steel pipe supporting from getting rusty, strengthened again its bearing strength simultaneously.On the mounted basis of filter beam, strictly control again the levelness installation of filter plate with spirit-leveling instrument.Accomplished that really full pond filter plate face lateral error is between ± 5 millimeters.Thereby also guaranteed the success of gas, water backwashing.
Backwash operation adopts: " gas punching; Gas～water rushes simultaneously; The water punching " three steps.All by the robot control system(RCS) time variable control.Flushing process is set as:
A, when head loss reaches 2.0m, close into water electric brake plate valve, treat that drainage flows into by overflow weir, therefore still some water continues to enter distributing trough, and enter the filter tank through distributing trough bottom transverse surface sweep washing hole.The filter tank continues to filter;
B, treat that the water surface is down to when exceeding filter material layer 15cm in the filter tank, close the water outlet purge valve;
C, startup gas blower are driven the recoil intake valve, and air evenly enters the bottom, filter tank through the top distribution aperture of gas, water dispenser canal, by the strainer head ejection, and loosening filter material layer, section dirt of friction filtrate, intensity is 15～16L/m
2.s, filter material surface impurity is cleaned and suspend in water.
D, last 2 minutes after, start wash-water pump, open recoil water inlet rinse water valve again, this moment, air blasting intensity still was 15～16L/m
2.s, to rush intensity be 3～4L/m to water
2.s.This moment, empty G﹠W entered gas, water dispenser canal simultaneously, evenly entered the filter tank through water distribution square hole and air distribution hole and strainer head again, and filtrate is further washed, and lateral surfaces is swept hole flushing and continued to sweep and wash simultaneously.According to the character of jet, make the surface sweep washing best results, this jet should be designed to half submerged jet.Therefore, distributing trough bottom transverse surface sweep washing aperture center absolute altitude is than the low 0.8～1.2cm of back flushing water level;
E, last the mixed punching of 4.5 minutes air waters after, close the recoil air intake valve.Open simultaneously the big bounce water intaking valve, make water rush intensity and reach 15～16L/m
2.s; Separately water again the back flushing several minutes, add that lateral surfaces sweeps hole flushing and sweep and wash, the impurity that will suspend in water at last all pours drainage tray.Be directly proportional with water flushing speed according to flow shear.In this stage, water rushes intensity and reaches 15～16L/m
2.s, make filtrate expand into quick condition, thus wash away and take away that front two stages (gas punching section, air water punching section) shampoos hold back dirt and be attached to small bubbles on the filtrate.Generally through twice backwash process, cut the dirt amount of leaving in the filtrate and be less than 0.1kg/m
3Back washing strength is higher, and section dirt amount of leaving over is few in the filtrate, the filtrate cleanliness is good, and initial filter water water quality is guaranteed.When the turbidity that enters the filter tank＜5NTU, filtering velocity is got 6～10m/h; Thickness of filter bed 1.5m is thick.Double-layer filter material, haydite: thick 0.8m, particle diameter 1.6～2.5mm; Quartz sand: thick 0.7m, particle diameter 0.7～1.2mm; This filter tank effluent quality＜0.5NTU.
F, after the punching of 2.0～2.5 minutes high strength water, close the backwashing intake valve door, this moment, the pond median water level approximately reached the highest operating water level;
G, open back-flushing draining electric brake plate valve after static 20 seconds, open first 50% and open, then open 100% and open and carry out draining.Under the filter tank filter plate is arranged, filtrate generally can not run off from the bottom, filter tank.High (15～the 16L/m of the intensity of backwashing water during back flushing
2.s), the rate of expansion of filtrate large (more than 40%), the lighter filtrate of general proportion as: granulated active carbon, haydite etc. are easy to run off from drainage tray.But this filter tank has owing to it: 1) bottom of draining electric brake plate valve is higher than filter material layer 0.15～0.20m; 2) draining electric brake plate valve is to finish in back flushing, and the filtrate sedimentation is progressively opened after 20 seconds again.Thereby guaranteeing that light filter material is unlikely by draining electric brake plate valve runs off;
H, general in 60～80 seconds the backwashing water in the drained filter tank, at this moment, the fine mud granule in the filter tank still is suspended state, can not precipitate, and is trapped in filter material surface.Continued to sweep by distributing trough bottom transverse surface sweep washing hole and wash, push impurity to discharge channel.A sealing manhole is arranged on the discharge channel base plate, make things convenient for personnel to enter in the gas, water dispenser canal scarfing cinder and observe filter plate bottom situation.After the whole eliminatings of impurity, close draining electric brake plate valve.Repetitive routine, back flushing once again.General by after twice back flushing, contain dirty rate in the filtrate and be lower than 0.1kg/m
3, and the small bubbles that are attached on the filtrate are also washed out basically.Then open water inlet electric brake plate valve, when treating that the pond median water level reaches certain altitude, leave the water purge valve, enter new round filtration cycle.
The invention has the beneficial effects as follows: relate to a kind of filter tank for Pretreatment Technology of Seawater Desalination.In the concrete of filter tank, add seawater corrosion resistance sanitas, with the protective system of the contacted concrete internal surface of seawater brushing sea water resistance, concrete in all adopt high alloy duplex stainless steel S32205 (ASTM), non-metallic material to adopt the material of the seawater corrosion resistances such as ERP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber with the metalwork of contact with sea water in the reinforcing bar brushing reinforcing bar rust remover, pond.Improved the filter tank weather resistance; The filter tank adopts air-water backwashing to add surface sweep washing, and backwash effect is good; There is new technical breakthrough the selection of filtering material aspect, adopts double-layer filter material, and it is strong that filtrate contains dirty ability, and the filter tank effluent quality obviously improves; By control draining electric brake plate valve, the high speed backwash, backwashing time is short, the recoil cycle is long, water loss is few, the filtrate leakage can not occur during back flushing during air-water backwashing; The operation level of automation is high, is convenient to management; Civil engineering structure is simple, and initial cost is economized, easy construction.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is plan structure schematic diagram of the present invention.
Fig. 2 is the 1-1 cross-sectional view of Fig. 1.
Fig. 3 is the 2-2 cross-sectional view of Fig. 1.
Among the figure 1, the total canal 2 of water inlet, water inlet electric brake plate valve 3, crest of weir 4, side opening
5, distributing trough 6, lateral surfaces are swept hole flushing 7, discharge channel 8, gas, water dispenser canal
9, water distribution square hole 10, air distribution hole 11, bottom space 12, draining electric brake plate valve
13 filter beams 14, filter plate 15, strainer head 16, ceramic grain filter
17, supporting layer 18, quartz sand filter media 19, manhole 20, intake valve
21, trapped well 22, effluent weir 23, clear water canal 24, gas blower
25, wash-water pump 26 purge valves 27, rinse water valve
Embodiment
As shown in the figure: a kind of filter for sea water desalination pretreatment, the filter tank main body adopts reinforced concrete structure.Because the filter tank is inner, the outside all is in the corrosive properly media environment, and concrete and inner reinforcing bar are had corrodibility.For improving the filter tank weather resistance, in concrete, add the RMA sanitas of seawater corrosion resistance; With the contacted concrete internal surface of seawater, the protective system of brushing sea water resistance; Reinforcing bar brushing reinforcing bar rust remover in the concrete; Metallic substance with contact with sea water in the pond all adopts high alloy duplex stainless steel S32205 (ASTM), and non-metallic material adopt the material of the seawater corrosion resistances such as FRP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber.
Flow characteristics according to fluid, when guaranteeing back flushing plane, filter tank gas, water dispenser evenly, the long-width ratio of filter tank planar dimension is: long: wide=4: 1～3.5: 1 (width does not comprise that air water distributes canal (8), and it is 0.7～0.9 meter that air water distributes canal (8) width).The length in filter tank is not less than 11 meters.
When work in the filter tank,, overflow across crest of weir (3) and enter distributing trough (5) through side opening (4) again by intaking total canal (1) behind water inlet electric brake plate valve (2) until drainage.Treat that drainage by distributing trough bottom transverse surface sweep washing hole (6) and the overflow weir overflow of groove top, evenly enters the filter tank.According to the filter tank influent quality from effluent quality is required different, can select individual layer homogeneous filtering material or bilayer, multilayer filtrate, also can change the filtrate in the filtering layer.General individual layer homogeneous filtering material is to adopt quartz sand (or haydite); Double-layer filter material is haydite (16) and quartz sand (18) (hard coal or quartz sand).The influent quality poor (as: former water is subject to little pollution, contains TOC when higher) when the filter tank, the filtrates such as available granulated active carbon displacement hard coal.Enter the filter tank and treat that drainage passes filter material layer, supporting layer (17) and strainer head (15) through gravity leakage and flows into bottom space (11).The strainer head material is the ABS engineering plastics.The long 28.5cm of filter; 36 in slit is arranged on the filter cap; Ф 2mm pore is arranged at filter handle top, and long 65mm, wide 1mm bar seam are arranged at the bottom; Filter is evenly distributed on the filter plate (14), arranges 48～56 for every square metre.Filter plate (14), filter beam (13) are Prefabricated reinforced concrete spare.Filter plate (14) is made rectangle, and the length of side is no more than 1.2m.Water is in water distribution square hole (9) imports gas, water dispenser canal (8) after the filter of bottom space (11), flow into clean water basin by trapped well in the piping lane (21), effluent weir (22), clear water canal (23) at last, filtering velocity is selected in 6～20m/h scope, changes automatic adjusting water outlet purge valve (26) open degree depending on raw water quality and realizes permanent head constant speed filter.
The equalization of pressure of any point below the filter plate during in order to ensure back flushing (14), and the air that filter plate (14) is pushed down into can form an air cushion layer as early as possible should have a highly suitable space between at the bottom of filter plate (14) and the pond.We are the height design of bottom space (11) below the filter plate 0.85～0.95 meter.This highly is enough to make air to pass through the hole of strainer head (15) and seam and is mixed fully and be evenly distributed on the area of whole filter tank, thereby has guaranteed the normal drainage work in filter tank and the regeneration effect of filter back washing.Adopt 905 seam special seal gums (in cement: sand: 905 glue=ratio was mixed with 905 mortars in 1: 1: 0.5) that between the filter plate (14) and the slit between filter plate (14) and the pool wall is sealed.Guaranteed water-tight gastight sealing property.Guarantee the quality of filter tank gas, water backwashing, most critical must strictly be controlled making and the installation of filter plate (14) filter beam (13), and the lateral error of filter plate (14) is between ± 2 millimeters; Full pond filter plate face lateral error is between ± 5 millimeters.Only have filter plate (14), the filter beam (13) smooth, strainer head (15) is in fact also just smooth.Be making and the installation quality of control filter plate (14) filter beam (13), filter plate (14) and filter beam (13) are often made prefabricated component.At precasting yard, elaborate filter plate (14), filter beam (13) with steel die, reinforcing bar and concrete, guarantee levelness and filter plate (14) thickness of single-piece filter plate (14), filter beam (13), and it is carried out maintenance, hold that quality first closes.Make whole pond filter plate face levelness high, crucial installing in filter beam (13).The embedded iron parts that we will install filter beam (13) usefulness is embedded in Chi Dishang accurately and smoothly, then at DN100 steel short tube of this piece embedded iron parts weldering, embedded iron parts in prefabricated filter beam (13) below welds a DN80 steel pipe again, the DN80 steel pipe is inserted in the DN100 steel pipe, use the spirit-leveling instrument levelling, after the level adjustment, again pipe is welded in aggregates.Then make mould with the DN200 pipe, sand-cement slurry is poured in the mould, make to form layer protecting film in the outside of DN100, DN80 pipe and prevent that the steel pipe supporting from getting rusty, strengthened again its bearing strength simultaneously.On the mounted basis of filter beam (13), strictly control again the levelness installation of filter plate (14) with spirit-leveling instrument.Accomplished that really full pond filter plate face lateral error is between ± 5 millimeters.Thereby also guaranteed the success of gas, water backwashing.
Backwash operation adopts: " gas punching; Gas～water rushes simultaneously; The water punching " three steps.All by the robot control system(RCS) time variable control.Flushing process is set as:
A, when head loss reaches 2.0m, close into water electric brake plate valve (2), treat that drainage flows into by overflow weir, therefore still some water continues to enter distributing trough (5), and enter the filter tank through distributing trough (5) bottom transverse surface sweep washing hole (6).The filter tank continues to filter;
B, when treating that the water surface is down to nearly filter material layer in the filter tank (approximately high 15cm), close water outlet purge valve (26);
C, startup gas blower (24) are driven recoil intake valve (20), and air evenly enters the bottom, filter tank through the top distribution aperture (10) of gas, water dispenser canal (8), sprayed by strainer head (15), loosening filter material layer, section dirt of friction filtrate, intensity is 15～16L/m
2.s, filter material surface impurity is cleaned and suspend in water.
D, last 2 minutes after, start wash-water pump (25), open recoil water inlet rinse water valve (27) again, this moment, air blasting intensity still was 15～16L/m
2.s, to rush intensity be 3～4L/m to water
2.s.This moment, empty G﹠W entered gas, water dispenser canal (8) simultaneously, evenly enter the filter tank through water distribution square hole (9) and air distribution hole (10) and strainer head (15) again, filtrate is further washed, and simultaneously lateral surfaces is swept hole flushing (6) and is continued to sweep and wash.According to the character of jet, make the surface sweep washing best results, this jet should be designed to half submerged jet.Therefore, center, distributing trough (5) bottom transverse surface sweep washing hole absolute altitude is than the low 0.8～1.2cm of back flushing water level;
E, last the mixed punching of 4.5 minutes air waters after, close recoil air intake valve (20).Open simultaneously big bounce water inlet rinse water valve (27), make water rush intensity and reach 15～16L/m
2.s; Separately water again the back flushing several minutes, add that lateral surfaces sweeps hole flushing (6) and sweep and wash, the impurity that will suspend in water at last all pours drainage tray (7).Be directly proportional with water flushing speed according to flow shear.In this stage, water rushes intensity and reaches 15～16L/m
2.s, make filtrate expand into quick condition, thus wash away and take away that front two stages (gas punching section, air water punching section) shampoos hold back dirt and be attached to small bubbles on the filtrate.Generally through twice backwash process, cut the dirt amount of leaving in the filtrate and be less than 0.1kg/m
3Back washing strength is higher, and section dirt amount of leaving over is few in the filtrate, the filtrate cleanliness is good, and initial filter water water quality is guaranteed.When the turbidity that enters the filter tank＜5NTU, filtering velocity is got 6～10m/h; Thickness of filter bed 1.5m.Double-layer filter material, haydite: thick 0.8m, particle diameter 1.6～2.5mm; Quartz sand: thick 0.7m, particle diameter 0.7～1.2mm; This filter tank effluent quality＜0.5NTU.
F, after the punching of 2.0～2.5 minutes high strength water, close recoil water inlet wash-down water valve (27), this moment, the pond median water level approximately reached the highest operating water level;
G, open back-flushing draining electric brake plate valve (12) after static 20 seconds, open first 50% and open, then open 100% and open and carry out draining.Filter plate (14) is arranged under the filter tank, and filtrate generally can not run off from the bottom, filter tank.High (15～the 16L/m of the intensity of backwashing water during back flushing
2.s), the rate of expansion of filtrate large (more than 40%), the lighter filtrate of general proportion as: granulated active carbon, haydite etc. are easy to run off from drainage tray.But this filter tank has owing to it: 1) bottom of draining electric brake plate valve (12) is higher than filter material layer 0.15～0.20m; 2) draining electric brake plate valve (12) is to finish in back flushing, and the filtrate sedimentation is progressively opened after 20 seconds again.Thereby guaranteeing that light filter material is unlikely by draining electric brake plate valve (12) runs off;
H, general in 60～80 seconds the backwashing water in the drained filter tank, at this moment, the fine mud granule in the filter tank still is suspended state, can not precipitate, and is trapped in filter material surface.Continued to sweep by distributing trough (5) bottom transverse surface sweep washing hole (6) and wash, push impurity to discharge channel (7).A sealing manhole (19) is arranged on discharge channel (7) base plate, make things convenient for personnel to enter gas, the interior scarfing cinder of water dispenser canal (8) and observe filter plate bottom situation.After the whole eliminatings of impurity, close draining electric brake plate valve (12).Repetitive routine, back flushing once again.General by after twice back flushing, contain dirty rate in the filtrate and be lower than 0.1kg/m
3, and the small bubbles that are attached on the filtrate are also washed out basically.Then open water inlet electric brake plate valve (2), when treating that the pond median water level reaches certain altitude, leave water purge valve (26), enter new round filtration cycle.
Claims (7)
1. a filter for sea water desalination pretreatment is characterized in that: the RMA sanitas that adds seawater corrosion resistance in the filter tank main body reinforced concrete structure, concrete; With the contacted concrete internal surface of seawater, the protective system of brushing sea water resistance; Reinforcing bar brushing reinforcing bar rust remover in the concrete; Metalwork with contact with sea water in the pond all adopts high alloy duplex stainless steel S32205, and non-metallic material adopt FRP glass filament reinforced plastics, ABS engineering plastics or EPDM elastomeric material.
2. filter for sea water desalination pretreatment according to claim 1, it is characterized in that: the long-width ratio of filter tank planar dimension is: long: wide=4: 1～3.5: 1, the length in filter tank is greater than 11 meters.
3. filter for sea water desalination pretreatment according to claim 1 is characterized in that: individual layer homogeneous filtering material employing quartz sand; Double-layer filter material adopts haydite and quartz sand; Former water is subject to little pollution, contains TOC when high, uses the granulated active carbon filtrate.
4. filter for sea water desalination pretreatment according to claim 1, it is characterized in that: a highly suitable space should be arranged between at the bottom of filter plate and the pond, and the height design in described space is 0.85～0.95 meter.
5. filter for sea water desalination pretreatment according to claim 1, it is characterized in that: the lateral error of filter plate is between ± 2 millimeters; Full pond filter plate face lateral error is between ± 5 millimeters.
6. filter for sea water desalination pretreatment according to claim 1, it is characterized in that: jet is designed to half submerged jet, and center, distributing trough bottom transverse surface sweep washing hole absolute altitude is than the low 0.8～1.2cm of back flushing water level.
7. filter for sea water desalination pretreatment according to claim 1 is characterized in that: a sealing manhole is arranged on the discharge channel base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010245901 CN102344174B (en) | 2010-08-05 | 2010-08-05 | Filter for sea water desalination pretreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010245901 CN102344174B (en) | 2010-08-05 | 2010-08-05 | Filter for sea water desalination pretreatment |
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| CN102531485B (en) * | 2012-03-14 | 2013-05-29 | 山东大学 | Biological aerated filter packing prepared from silt of Yellow River and preparation method for biological aerated filter packing |
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|---|---|---|---|---|
| CN1113534A (en) * | 1995-01-11 | 1995-12-20 | 陆建衡 | Composite concrete construction and its design method |
| CN1250824A (en) * | 1998-10-08 | 2000-04-19 | 中国科学院福建物质结构研究所二部 | Cathode protection method for reinforced concrete caisson group of seaside wharf and its dedicated instrument |
| CN2813639Y (en) * | 2004-08-03 | 2006-09-06 | 中国海洋大学 | Dead anode protector for steel reinforced concrete structures |
| DE102007043270A1 (en) * | 2007-09-11 | 2009-03-12 | Jähning GmbH Felssicherung und Zaunbau | Seawater resistant concrete composition |
| CN201882931U (en) * | 2010-08-05 | 2011-06-29 | 王宝良 | Filter pond for desalination pretreatment of sea water |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113534A (en) * | 1995-01-11 | 1995-12-20 | 陆建衡 | Composite concrete construction and its design method |
| CN1250824A (en) * | 1998-10-08 | 2000-04-19 | 中国科学院福建物质结构研究所二部 | Cathode protection method for reinforced concrete caisson group of seaside wharf and its dedicated instrument |
| CN2813639Y (en) * | 2004-08-03 | 2006-09-06 | 中国海洋大学 | Dead anode protector for steel reinforced concrete structures |
| DE102007043270A1 (en) * | 2007-09-11 | 2009-03-12 | Jähning GmbH Felssicherung und Zaunbau | Seawater resistant concrete composition |
| CN201882931U (en) * | 2010-08-05 | 2011-06-29 | 王宝良 | Filter pond for desalination pretreatment of sea water |
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