CN102344174A - Filter for sea water desalination pretreatment - Google Patents
Filter for sea water desalination pretreatment Download PDFInfo
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- CN102344174A CN102344174A CN2010102459019A CN201010245901A CN102344174A CN 102344174 A CN102344174 A CN 102344174A CN 2010102459019 A CN2010102459019 A CN 2010102459019A CN 201010245901 A CN201010245901 A CN 201010245901A CN 102344174 A CN102344174 A CN 102344174A
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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
Affiliated 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 desalinization " also claimed in sea water desaltination, promptly 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 receive space-time and weather effect.Water quality is good, price is gradually reasonable, can ensure coastal resident's tap water and process water demand.
The target of sea water desaltination forward high efficiency, low energyization and mass-producing development in the world in recent years, r-o-(SWRO), MSF (MSF) and multiple-effect evaporation (MED) more become the main flow that is applicable to large-scale desalination technology.
Large-scale sea water desaltination project is a unusual complicated system engineering often.With regard to main processes, comprise sea water preprocessing, desalination (desalination), desalination water aftertreatment etc.Wherein pre-treatment is meant that the device that has got into the desalination function at seawater before to its necessity of doing processing, removes marine life as killing, and reduces turbidity, removes suspended substance (to reverse osmosis method), or outgas (to distillation method), the medicament that interpolation is necessary etc.The pre-processing device that adopts has flocculation sedimentation tank, filter tank, UF, MF etc. usually; Desalination then is to remove the salinity in the seawater through above-listed a certain method; It is the core of whole desalination system; This process often need solve the anticorrosion of equipment and antiscale problem except that requiring efficient desalination, also require to have corresponding energy recovery measure in some technology; Aftertreatment then is the product water to different desalination methods, to processing such as regulating and controlling water quality that different customer requirements carried out and storings.
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 silica sand.But the filter tank that is exclusively used in the sea water desaltination preprocessing process also seldom.Because the singularity of desalting environment, himself special requirement need be satisfied in the filter tank that is used for sea water desaltination.In order to overcome the deficiency of 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 present invention provides a kind of novel sea water desalinization pre-treatment to 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; Phenomenons such as it is out-of-level to have solved filter plate filter beam, and 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 through 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 filtrate selection 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: the filter tank is used in a kind of sea water desaltination pre-treatment, and 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 seawater corrosion resistances such as FRP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber.
According to the fluidic flow characteristics, 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, treat drainage by intaking total canal behind water inlet electric brake plate valve, the crest of weir that overflow gets into distributing trough through side opening again.Treat that drainage by distributing trough bottom transverse surface sweep washing hole and the overflow weir overflow of groove top, evenly gets into the filter tank.According to the filter tank influent quality with 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 silica sand (or haydite); Double-layer filter material is haydite and silica sand (hard coal or silica sand).The influent quality poor (Ru Yuanshui receives little pollution, contains TOC when higher) when the filter tank, 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; On the filter cap 36 in slit is arranged; Φ 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 the reinforced concrete prefab.Filter plate is processed 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 for use in 6～20m/h scope, looks the automatic water outlet purge valve open degree of regulating of raw water quality variation 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 designed to 0.85～0.95 meter to the height of bottom space below the filter plate.This highly is enough to make hole and the seam of air through strainer head to be mixed fully and is 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 the 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.Have only filter plate, filter Liangping to put in order, strainer head is in fact also just smooth.Be the making and the installation quality of control filter plate filter beam, filter plate is processed prefab with the filter beam.At precasting yard, elaborate filter plate, filter beam with steel die, reinforcing bar and concrete, guarantee the 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 Chi Dishang accurately and smoothly; On this piece embedded iron parts, weld a DN100 steel short tube then; DN80 steel pipe of weldering on the embedded iron parts below the prefabricated filter beam is inserted in the DN80 steel pipe in the DN100 steel pipe again, uses the spirit-leveling instrument levelling; After the level adjustment, again pipe is welded in aggregates.Make mould with DN200 pipe then, 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 its bearing strength simultaneously again.On the mounted basis of filter beam, install with the levelness of the strict control of spirit-leveling instrument filter plate again.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 dashes; Gas～water dashes simultaneously; Water dashes " three steps.All by the robot control system(RCS) time variable control.Flushing process is set at:
A, when head loss reaches 2.0m, close into water electric brake plate valve, treat that drainage passes through overflow weir and flows into, so still some water continues to get into distributing trough, and through distributing trough bottom transverse surface sweep washing hole the entering filter tank.The filter tank continues to filter;
B, treat that the water surface is reduced 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 gets into 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, gas still was 15～16L/m towards intensity
2.s, water is 3～4L/m towards intensity
2.s.This moment, empty G&W got into gas, water dispenser canal simultaneously, evenly got into the filter tank through water distribution square hole and air distribution hole and strainer head again, and filtrate is further washed, and the while lateral surfaces is swept hole flushing and continued to sweep and wash.According to effusive character, 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 4.5 minutes air waters mix dash after, close the recoil air intake valve.Open the big bounce water intaking valve simultaneously, make water reach 15～16L/m towards intensity
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 sk-.Be directly proportional with water flushing speed according to flow shear.In this stage, water reaches 15～16L/m towards intensity
2.s, make filtrate expand into quick condition, thereby wash away and take away preceding two stages (gas dashes section, air water dashes section) shampoos hold back dirt and be attached to the small bubbles on the filtrate.General 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 gets into 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; Silica sand: thick 0.7m, particle diameter 0.7～1.2mm; This filter tank effluent quality＜0.5NTU.
F, after 2.0～2.5 minutes HS water dashes, close the backwashing intake valve door, this moment, the pond median water level reached the highest operating water level approximately;
G, open recoil water draining electric brake plate valve after static 20 seconds, open 50% earlier and open, open 100% then 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 big (more than 40%), the lighter filtrate of general proportion as: granulated active carbon, haydite etc. are easy to run off from sk-.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 through draining electric brake plate valve runs off;
H, generally in 60～80 seconds, arranged the backwashing water in the 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.Continue 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 get 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 through after twice back flushing, contain dirty rate in the filtrate and be lower than 0.1kg/m
3, and also washed out basically attached to the small bubbles on the filtrate.Open water inlet electric brake plate valve then, when treating that the pond median water level reaches certain altitude, leave the water purge valve, get into new round filtration cycle.
The invention has the beneficial effects as follows: relate to a kind of filter tank that is used for the sea water desaltination pretreatment technology.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 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 filtrate selection aspect, adopts double-layer filter material, and it is strong that filtrate contains dirty ability, and the filter tank effluent quality obviously improves; Through control draining electric brake plate valve, high speed backwash, backwashing time are lacked, 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
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a plan structure synoptic 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 of water inlet 2, 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: the filter tank is used in a kind of sea water desaltination pre-treatment, and 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 seawater corrosion resistances such as FRP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber.
According to the fluidic flow characteristics; 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, treat drainage by intaking total canal (1) behind water inlet electric brake plate valve (2), the crest of weir that overflow (3) gets into distributing trough (5) through side opening (4) again.Treat that drainage by distributing trough bottom transverse surface sweep washing hole (6) and the overflow weir overflow of groove top, evenly gets into the filter tank.According to the filter tank influent quality with 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 silica sand (or haydite); Double-layer filter material is haydite (16) and silica sand (18) (hard coal or silica sand).The influent quality poor (as: former water receives little pollution, contains TOC when higher) when the filter tank, filtrates such as available granulated active carbon displacement hard coal.Get into 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; On the filter cap 36 in slit is arranged; Φ 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 the reinforced concrete prefab.Filter plate (14) is processed 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 for use in 6～20m/h scope, looks automatic water outlet purge valve (26) open degree of regulating of raw water quality variation 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 designed to 0.85～0.95 meter to the height of bottom space (11) below the filter plate.This hole and seam that highly is enough to make air to pass through strainer head (15) is mixed fully and is 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 that filter plate (14) is filtered 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.Have only filter plate (14), the filter beam (13) smooth, strainer head (15) is in fact also just smooth.Be the making and the installation quality of control filter plate (14) filter beam (13), filter plate (14) and filter beam (13) are often processed prefab.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, the pass of holding that quality first.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; On this piece embedded iron parts, weld a DN100 steel short tube then; DN80 steel pipe of weldering on the embedded iron parts of prefabricated filter beam (13) below is inserted in the DN80 steel pipe in the DN100 steel pipe again, uses the spirit-leveling instrument levelling; After the level adjustment, again pipe is welded in aggregates.Make mould with DN200 pipe then, 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 its bearing strength simultaneously again.On the mounted basis of filter beam (13), install with the levelness of spirit-leveling instrument strict control filter plate (14) again.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 dashes; Gas～water dashes simultaneously; Water dashes " three steps.All by the robot control system(RCS) time variable control.Flushing process is set at:
A, when head loss reaches 2.0m, close into water electric brake plate valve (2), treat that drainage passes through overflow weir and flows into, so still some water continues to get into distributing trough (5), and through distributing trough (5) bottom transverse surface sweep washing hole (6) the entering filter tank.The filter tank continues to filter;
B, when treating in the filter tank that the water surface is reduced to nearly filter material layer (high approximately 15cm), close water outlet purge valve (26);
C, startup gas blower (24) are driven the intake valve (20) that recoils, and air evenly gets into the bottom, filter tank through the top distribution aperture (10) of gas, water dispenser canal (8), by strainer head (15) ejection, and loosening filter material layer, section dirt of the filtrate that rubs, 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, gas still was 15～16L/m towards intensity
2.s, water is 3～4L/m towards intensity
2.s.This moment, empty G&W got into gas, water dispenser canal (8) simultaneously, evenly got into the filter tank through water distribution square hole (9) and air distribution hole (10) and strainer head (15) again, and filtrate is further washed, and the while lateral surfaces is swept hole flushing (6) and continued to sweep and wash.According to effusive character, 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 4.5 minutes air waters mix dash after, close recoil air intake valve (20).Open big bounce water inlet rinse water valve (27) simultaneously, make water reach 15～16L/m towards intensity
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 sk-(7).Be directly proportional with water flushing speed according to flow shear.In this stage, water reaches 15～16L/m towards intensity
2.s, make filtrate expand into quick condition, thereby wash away and take away preceding two stages (gas dashes section, air water dashes section) shampoos hold back dirt and be attached to the small bubbles on the filtrate.General 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 gets into 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; Silica sand: thick 0.7m, particle diameter 0.7～1.2mm; This filter tank effluent quality＜0.5NTU.
F, after 2.0～2.5 minutes HS water dashes, close recoil water inlet wash-down water valve (27), this moment, the pond median water level reached the highest operating water level approximately;
G, open recoil water draining electric brake plate valve (12) after static 20 seconds, open 50% earlier and open, open 100% then 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 big (more than 40%), the lighter filtrate of general proportion as: granulated active carbon, haydite etc. are easy to run off from sk-.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 through draining electric brake plate valve (12) runs off;
H, generally in 60～80 seconds, arranged the backwashing water in the 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.Continue 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 get into 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 through after twice back flushing, contain dirty rate in the filtrate and be lower than 0.1kg/m
3, and also washed out basically attached to the small bubbles on the filtrate.Open water inlet electric brake plate valve (2) then, when treating that the pond median water level reaches certain altitude, leave water purge valve (26), get into new round filtration cycle.
Claims (10)
1. the filter tank is used in a sea water desaltination pre-treatment, it is characterized in that: 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 seawater corrosion resistances such as FRP glass filament reinforced plastics, ABS engineering plastics and EPDM rubber.
2. filter tank according to claim 1; It is characterized in that: according to the fluidic flow characteristics; 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.
3. filter tank according to claim 1 is characterized in that: according to the filter tank influent quality with 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 silica sand (or haydite); Double-layer filter material is haydite and silica sand (hard coal or silica sand).The influent quality poor (routine former water receives little pollution, contains TOC when higher) when the filter tank, filtrates such as available granulated active carbon displacement hard coal.
4. filter tank according to claim 1; It is characterized in that: 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, a highly suitable space should be arranged between at the bottom of filter plate and the pond.We are designed to 0.85～0.95 meter to the height of bottom space below the filter plate.This highly is enough to make hole and the seam of air through strainer head to be mixed fully and is 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.
5. filter tank according to claim 1 is characterized in that: 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.
6. filter tank according to claim 1 is characterized in that: guarantee the quality of filter tank gas, water backwashing, most critical must strictly be controlled the 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.Have only filter plate, filter Liangping to put in order, strainer head is in fact also just smooth.Be the making and the installation quality of control filter plate filter beam, filter plate is often processed prefab with the filter beam.At precasting yard, elaborate filter plate, filter beam with steel die, reinforcing bar and concrete, guarantee the 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 Chi Dishang accurately and smoothly; On this piece embedded iron parts, weld a DN100 steel short tube then; DN80 steel pipe of weldering on the embedded iron parts below the prefabricated filter beam is inserted in the DN80 steel pipe in the DN100 steel pipe again, uses the spirit-leveling instrument levelling; After the level adjustment, again pipe is welded in aggregates.Make mould with DN200 pipe then, 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 its bearing strength simultaneously again.On the mounted basis of filter beam, install with the levelness of the strict control of spirit-leveling instrument filter plate again.Accomplished that really full pond filter plate face lateral error is between ± 5 millimeters.Thereby also guaranteed the success of gas, water backwashing.
7. filter tank according to claim 1 is characterized in that: according to effusive character, make the surface sweep washing best results, this jet should be designed to half submerged jet.Therefore, center, distributing trough bottom transverse surface sweep washing hole absolute altitude is than the low 0.8～1.2cm of back flushing water level.
8. filter tank according to claim 1 is characterized in that: be directly proportional with water flushing speed according to flow shear.Water reaches 15～16L/m towards intensity
2.s, make filtrate expand into quick condition, thereby wash away and take away preceding two stages (gas dashes section, air water dashes section) shampoos hold back dirt and be attached to the small bubbles on the filtrate.General 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 gets into 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; Silica sand: thick 0.7m, particle diameter 0.7～1.2mm; This filter tank effluent quality＜0.5NTU.
9. filter tank according to claim 1 is characterized in that: 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 big (more than 40%), the lighter filtrate of general proportion as: granulated active carbon, haydite etc. are easy to run off from sk-.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 through draining electric brake plate valve runs off.
10. filter tank according to claim 1 is characterized in that: a sealing manhole is arranged on the discharge channel base plate, make things convenient for personnel to get in the gas, water dispenser canal scarfing cinder and observe filter plate bottom situation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010245901 CN102344174B (en) | 2010-08-05 | 2010-08-05 | Filter for sea water desalination pretreatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010245901 CN102344174B (en) | 2010-08-05 | 2010-08-05 | Filter for sea water desalination pretreatment |
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| CN102344174B CN102344174B (en) | 2013-09-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531485A (en) * | 2012-03-14 | 2012-07-04 | 山东大学 | Biological aerated filter packing prepared from silt of Yellow River and preparation method for biological aerated filter packing |
| CN116040844A (en) * | 2022-12-13 | 2023-05-02 | 浙江大学 | Mariculture circulating water system for strengthening sand filtration raw water and treatment method |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531485A (en) * | 2012-03-14 | 2012-07-04 | 山东大学 | Biological aerated filter packing prepared from silt of Yellow River and preparation method for biological aerated filter packing |
| CN116040844A (en) * | 2022-12-13 | 2023-05-02 | 浙江大学 | Mariculture circulating water system for strengthening sand filtration raw water and treatment method |
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| Publication number | Publication date |
|---|---|
| CN102344174B (en) | 2013-09-18 |
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Owner name: MCC SEAWATER DESALINIZATION INVESTMENT CO., LTD. Free format text: FORMER OWNER: ZHONGYE CONTINUOUS CASTING TECH. ENGINEERING CO., LTD. Effective date: 20150805 |
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Effective date of registration: 20150805 Address after: 100088 Beijing city Haidian District Xitucheng Road No. 33 Patentee after: MCC DESALINATION INVESTMENTS CO., LTD. Address before: 430073 Hubei city of Wuhan province East Lake new technology development zone of the southern Optics Valley Industrial Park Road No. 51 (a post office) Patentee before: Zhongye Continuous Casting Tech. Engineering Co., Ltd. |
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Effective date of registration: 20180102 Address after: 100088 Beijing city Haidian District Xitucheng Road No. 33 Co-patentee after: MCC Central Research Institute of Building and Construction Co., Ltd. Patentee after: Zhong Ye energy-conserving and environment-protective limited liability company Co-patentee after: China Jingye Engineering Technology Co., Ltd. Address before: 100088 Beijing city Haidian District Xitucheng Road No. 33 Patentee before: MCC DESALINATION INVESTMENTS CO., LTD. |
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