CN105130105A - Gas - water joint backwashing system and process - Google Patents
Gas - water joint backwashing system and process Download PDFInfo
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- CN105130105A CN105130105A CN201510500294.9A CN201510500294A CN105130105A CN 105130105 A CN105130105 A CN 105130105A CN 201510500294 A CN201510500294 A CN 201510500294A CN 105130105 A CN105130105 A CN 105130105A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011001 backwashing Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 26
- 239000002351 wastewater Substances 0.000 claims abstract description 32
- 244000005700 microbiome Species 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 238000011010 flushing procedure Methods 0.000 claims description 80
- 238000009826 distribution Methods 0.000 claims description 34
- 239000000126 substance Substances 0.000 claims description 31
- 239000000706 filtrate Substances 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000010926 purge Methods 0.000 claims description 8
- 230000000813 microbial effect Effects 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005406 washing Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 229910052757 nitrogen Inorganic materials 0.000 description 18
- 239000000463 material Substances 0.000 description 17
- 238000001914 filtration Methods 0.000 description 13
- 241000894006 Bacteria Species 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 230000000717 retained effect Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000009287 sand filtration Methods 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
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- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 238000010408 sweeping Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Biological Treatment Of Waste Water (AREA)
Abstract
The present invention discloses a gas - water joint backwashing system and process, the main steps of backwashing procedure are as follows: (1) reducing the liquid level to reduce waste water discharge; (2) preparing for gas washing, and forming a gas cushion layer and loosing a filter bed; (3) washing with a gas; (4) washing by combination of the gas and water; (5) discharging the gas; (6) washing with water; and (7) completing the washing; entrapped suspended solids and excess microorganisms are removed, sufficient microorganisms are kept for subsequent processing operation, the backwash process does not lead to loss of media, water and energy consumption is minimized, and the backwash program starts and runs automatically.
Description
Technical field
The present invention relates to sewage treatment area, particularly a kind of combined water and air backwash system of advanced nitrogen V-type filter tank.
Background technology
Typical sewage quality generally comprises organism, nitrogen, phosphorus and suspended substance.Along with the raising day by day of environmental protection codes and standards, by process Water circulation or before entering environment water, effectively must remove the nitrogen in water body, phosphorus and suspended substance, especially the process water Nitrogen-and Phosphorus-containing for avoiding entering environment water is too high causes body eutrophication, is strictly limited nitrogen and phosphorus content in sewage disposal emission standard.
In removal suspended substance and phosphorus, V-type filter tank has good treatment effect.V-type filter tank is a kind of sand filtration filtration process, developed by French Degremont S.A, in 1994 in french application patent (
v-type filter tank), and be used widely in feedwater and advanced treatment of wastewater, to the phosphorus in water body and suspended substance, there is good treatment effect.There is good SS filter effect in V-type filter tank, technology maturation.In denitrogenation,
dN denitrification filter pool is the heavy filter material biological filter developed by French Degremont S.A, has obtained industry at home and has generally approved, has that floor space is little, denitrifying load is high, the technical characteristic of strong shock resistance.
dN denitrification filter pool shows excellence in denitrogenation.
In bacteria filter system operational process, first the suspended substance in water inlet can be retained by filtrate absorption.As time goes on, suspended substance can be accumulated in system, causes head loss, and filter bed penetrates even, causes process water outlet concentration of suspension to worsen, thus must remove the suspended substance retained in time.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, in conjunction with V-type filter tank and
the technical characterstic of DN denitrification filter pool, proposes a kind of combined water and air backwash system being applicable to advanced nitrogen V-type filter tank.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of combined water and air backwash system, comprise air water distribution chamber, back flushing air-water distribution tray and back flushing drainage tray, it is characterized in that: described air water distribution chamber is positioned at filter tank body bottom portion, back flushing air-water distribution tray and back flushing drainage tray are positioned at body side, filter tank, backwash gas water dispenser slot is below back flushing drainage tray, be provided with back flushing inlet pipe, back flushing water inlet pipe and rising pipe in described back flushing air-water distribution tray, back flushing water inlet pipe is connected with water distributing area bottom filter tank with inlet pipe; Back flushing drainage tray is positioned at above back flushing air-water distribution tray, and is communicated with by back-flushing drainage weir with biological filter; Described back flushing drainage tray is provided with backwashing wastewater pipe; Air water distribution chamber is arranged in the below of filter tank body filter plate, carries out water distribution and distribution by the filter that filter plate is installed; Back flushing air-water distribution tray is communicated with by air water dispensing orifice with air water distribution chamber.
Further, adopt two filter tank bodies positioned opposite, the symmetrical distribution of air water distribution chamber; Backwash gas water dispenser slot is in the middle of two air water distribution chambers, and back flushing drainage tray is positioned in the middle of two filter tank bodies.
Further, back flushing drainage tray is communicated with by top back-flushing drainage weir with biological filter, and back-flushing drainage weir has wedge structure, is scarp towards side, biological filter.
Based on a backwash technique for combined water and air backwash system described in claim 1, it is characterized in that, comprise the following steps:
(1) reduce liquid level to reduce discharge of wastewater, after controlling out water regulating valve filter tank liquid level is reduced to certain altitude, close out water regulating valve;
(2) air purge prepares, and introduces backwash air by back flushing inlet pipe, and back flushing air inlet can form air cushion layer under filter plate;
(3) air purge, by the filter of mounting arrangements on filter plate, uniform stream distribution is upwards flowed into filter bed, the backwash air of larger flow velocity increases the turbulivity in filter bed, discharge the suspended substance be trapped, and the microorganism that will filtrate adhere to peels off;
(4) air water combines flushing, and backwashing water upwards by filter bed by back flushing water inlet pipe, is caused filter bed expansion to a certain degree and presents fluidized state, and this expansion and fluidized state allow the suspended substance wash-out that is trapped going out;
(5) be vented, stop air feed and supply backwashing water, the static excess air effusion carried out in water;
(6) wash, open backwashing water, the waste water that back flushing produces will enter back flushing drainage tray, be discharged by backwashing wastewater pipe; ;
(7) back flushing terminates.
Further, for back flushing water from process water outlet clean water basin.
Further, during step (6) backwash, still keep V-type groove to intake, the surface intake by former water is assisted to sweep to wash and backwash in filtrate can be accelerated to be drained by backwashing wastewater pipe rapidly to the microbial film of the water surface and suspended substance, shortens the backwash saving of time water yield.
Further, the wedge shape buffering effluent weir at back flushing drainage tray top is utilized, filterins media run-off when avoiding discharging backwashing wastewater.
Further, before step (1), detect working time and head loss, start according to system operation time or the head loss that presets, to certain hour or detect that head loss starts backwash process automatically lower than during preset value when running.
Beneficial effect of the present invention:
(1) after backwash filter bed whole removing except the suspended substance that retains and excessive microorganism; (2) microorganism simultaneously keeping enough runs for subsequent technique: do not cause filtrate loss (as run material) in (3) backwash process; (4) water consumption and energy consumption minimized; (5) backwash procedure is automatic start-up and operation.
Accompanying drawing explanation
Fig. 1 filter tank normal filtration schematic diagram
Fig. 2 filter back washing schematic diagram
11-ceramic aggregate biological filtrate; 12-quartz sand filter media; 13-gravel supporting layer; 14-filter; 20-V type is intake and is swept wash water canal; 21-carbon source; 22-coagulating agent; 23-goes out water regulating valve; 30-back flushing water inlet pipe; 31-back flushing inlet pipe; 32-air cushion layer; 33-backwashing wastewater pipe.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail, should be appreciated that content described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Be a kind of Downward-flow biofilter in the present invention, be applied to sewage disposal.More specifically, the present invention a kind ofly relies on the lower to streaming system of gravity filtration, and use a kind of heavy filter material, filter bed is all immersed in water, reaches the function of effective denitrogenation, dephosphorization and removal suspended substance simultaneously.This biological filtering tank process can be regarded as advanced treatment, after being used in sewage second-level process.
Fig. 1, embodiment illustrated in fig. 2 in, a monomer V-type biological filter forms by with lower member: a Rectangular Water Trough, V-type water inlet and sweep wash water canal and be positioned at tank two side roof part, and former water accesses thus.Backwashing wastewater slot is in the middle of filter tank, and be provided with backwashing wastewater pipe 33, backwashing wastewater is discharged thus.Have that the microorganism of function of biological purification is attached in a large number to be combined on filtrate 11 and 12.Supporting layer is overall filter plate 13 times, and the filter 14 be mounted thereon can ensure that biological filter water and air distributing is even, and filter plate and upper filter thereof have good sealing property, are backwash gas water dispenser room under filter plate.Be back flushing air-water distribution tray under backwashing wastewater groove, go out water regulating valve 23 after back flushing water inlet pipe 30, back flushing inlet pipe 31 and filter and access thus.Process water is discharged by going out water regulating valve 23, and backwashing wastewater is discharged after drainage weir to backwashing wastewater pipe 33.
Concrete water technology, is characterized in that, comprises the following steps:
Step one, filtration procedure, former water distributes canal by V-type water inlet and enters filter tank, filters downwards under gravity, successively by the biological filter bed of material, fine filtering layer, supporting layer and filter, and is discharged by bottom;
Step 2, drive nitrogen process, close water inlet, go out after keeping filter after water regulating valve is opened into liquid level reduction certain altitude and close, again backwashing water is entered water distributing area bottom filter tank via back flushing water inlet pipe, by filter carry out water distribution backward on enter biofilter material layer, drive away the nitrogen bubble of accumulation in filtrate;
Step 3, backwash process, first back flushing air enters bottom filter tank via back flushing inlet pipe, forms an air cushion layer; Then backwashing water enters water distributing area bottom filter tank via back flushing water inlet pipe again, biofilter material layer is entered after carrying out uniform blasting and water distribution by filter, cleaning biological filter, backwashing wastewater to a certain extent after backwashing wastewater drainage tray through top, biological filter discharge to waste pipe.
First, the waste water that bacteria filter system reception etc. are to be treated, being intake by V-type and sweeping wash water canal 20 is entered, and has processed rear water outlet and has passed through water regulating valve 23 and discharge.Use a kind of ceramic aggregate biological filtrate 11 of high-specific surface area in this system, contribute to attachment and the growth of microorganism.High-specific surface area filtrate, as
the BIOLITETM clay filtering material that DN denitrification filter pool uses, can be used.The distinctive cellular structure of BIOLITETM clay filtering material contributes to the attachment of microorganism, and filtrate diameter range is 1mm ~ 5mm.
The ceramic aggregate biological filtrate 11 of high-specific surface area can be lived away from home a large amount of microorganism, (adds carbon source 21), remove the nitric nitrogen (NO3-N and NO2-N) in water inlet, and retain into the suspended substance in water under suitable environment; Simultaneously under the help of coagulating agent 22, assist to remove the phosphoric acid salt (PO4-P) in water inlet and suspended substance.
Except ceramic aggregate biological filter material layer 11, this bacteria filter system also can place quartz sand filter media 12 in filter material layer 11 bottom simultaneously, plays further secondary filter; Quartz sand filter media bottom is gravel supporting layer 13, is used for supporting filter material layer 12 and 11, and prevents filtrate 12 or 11 from blocking filter 14.Gravel supporting layer 13 can be made up of the gravel of different gradation.More specifically, the size of this graded gravel is between 8mm ~ 40mm.
The particle diameter of upper strata biofilter material 11 is greater than the particle diameter of lower quartz sand 12, but density is contrary, is conducive to like this playing respective advantage, and top filtrate 11 particle diameter is comparatively large, based on biological denitrificaion, and retains oarse-grained suspended substance.Bottom filtrate 12 particle diameter is less, mainly rises and retains fine suspension further, obtains better effluent quality.Upper strata biofilter material and lower floor's quartz sand filter media Size Matching, all can reach certain rate of expansion and partial fluidised state when back flushing, and back flushing terminates rear recovery layering clearly 11 and 12.
Water inlet (for Sewage Plant secondary clarifier effluent) enters from the top of bacteria filter system, after flowing through filter material layer 11,12 and gravel bed 13, then through filter 14, finally goes out water regulating valve 23 from bottom treatment and discharges.
Water level in filtration procedure in filter tank, by water outlet governor valve control, adopts RegulazurIII master mode, can make filtration water level substantially constant, so both can ensure stable effluent quality, the consumption of can substantially not intake again drop thus minimizing carbon source.
In order to allow microorganism better be attached on filtrate 11 effectively to remove the nitric nitrogen in water inlet, need additional carbon 21 in most cases.Different types of carbon source all can be used, as methyl alcohol, ethanol, acetic acid or sodium acetate.In operational process, microbes utilizes the nitric nitrogen in intaking as electron acceptor(EA), consumes additional carbon simultaneously.Owing to maintaining specific denitrification environment in bacteria filter system, on filtrate 11, the microbes of attachment consumes into the nitric nitrogen in water, thus the DO of process water outlet is generally lower than 0.5mg/L.Additional carbon 21 can as electron donor, and facilitate the removal of nitric nitrogen, final nitric nitrogen can be discharged with the form of N2.
Further optimization design, for ensureing the continuous operation to streaming system under this, periodic operation must drive nitrogen program, also namely remove in denitrification process by backwashing water the nitrogen bubble be accumulated in filter bed, this contributes to the smooth running extending filtration cycle and the system of guarantee.Driving nitrogen program is by stopping water inlet in filtration procedure, but continues to filter (go out water regulating valve 23 and be still in opened condition), and water level decreasing to close to after filter material surface, utilizes back flushing to intake removal nitrogen, and such used time is very short also discharges without waste water.
In bacteria filter system operational process, first the suspended substance in water inlet can be retained by filtrate absorption.As time goes on, suspended substance can be accumulated in system, causes head loss, and filter bed penetrates even, causes process water outlet concentration of suspension to worsen, thus must remove the suspended substance retained in time.Correspondingly, bacteria filter system contains the removal of back flushing water inlet in order to assist suspended substance.
The key step of backwash procedure is as follows: reduce liquid level to reduce discharge of wastewater, after controlling out water regulating valve filter tank liquid level is reduced to certain altitude, close out water regulating valve;
Air purge prepares, and introduces backwash air by back flushing inlet pipe, and back flushing air inlet can form air cushion layer under filter plate;
Air purge, by the filter of mounting arrangements on filter plate, uniform stream distribution is upwards flowed into filter bed, the backwash air of larger flow velocity increases the turbulivity in filter bed, discharge the suspended substance be trapped, and the microorganism that will filtrate adhere to peels off;
Air water combines flushing, and backwashing water upwards by filter bed by back flushing water inlet pipe, is caused filter bed expansion to a certain degree and presents fluidized state, and this expansion and fluidized state allow the suspended substance wash-out that is trapped going out;
Exhaust, stops air feed and for backwashing water, static excess air of carrying out in water is overflowed;
Washing, opens backwashing water, and the waste water that back flushing produces will enter back flushing drainage tray, be discharged by backwashing wastewater pipe;
Back flushing terminates.
Backwashing water upwards by filter bed by back flushing water inlet pipe 30, can be caused filter bed expansion to a certain degree and present fluidized state, and this expansion and fluidized state can allow the suspended substance wash-out that is trapped going out.The waste water that back flushing produces will be discharged by backwashing wastewater pipe 33.
But the suspended substance that independent water backwash is difficult to be retained by filtrate is fully rinsed well, in conjunction with air purge, must be introduced by back flushing inlet pipe 31.First back flushing air inlet can form air cushion layer 32 under filter plate, is more upwards flowed into by filter uniformly distributing, and the backwash air of larger flow velocity can increase the turbulivity in filter bed, discharges the suspended substance be trapped, and is peeled off by the microorganism that filtrate adheres to.By regular back flushing, the suspended substance can removed excessive microorganism He be trapped, ensures that the normal table of system runs.
V-type biological filter still keeps V-type groove to intake when backwash, the surface intake by former water is like this assisted to sweep to wash and backwash in filtrate can be accelerated to be drained by backwashing wastewater pipe 33 rapidly to the microbial film of the water surface and suspended substance, substantially reduces the backwash time and has saved the water yield.The wedge shape buffering effluent weir at backwashing wastewater canal top, effectively can avoid filterins media run-off.
For the backwash procedure of biological filter, following requirement can be met: after (1) backwash, filter bed entirety must eliminate the suspended substance and excessive microorganism that retain; (2) microorganism that simultaneously must keep enough runs for subsequent technique: can not cause filtrate loss (as run material) in (3) backwash process; (4) water consumption and energy consumption must minimize; (5) backwash procedure must be automatic start-up and operation.
Correspondingly, standard backwash procedure has been developed for meeting the demand, can be optimized according to operating experience and revise simultaneously in actual moving process.Backwash procedure can start automatically according to working time or the head loss preset.For back flushing water generally from process water outlet clean water basin.
Described automatic backflushing washing procedure and drive nitrogen program and ensure that the simple and reliable of bacteria filter system operation and maintenance.
This biological filtering tank process can provide (1) individual layer circular heavy filter material, for attached growth of microorganisms and retain suspended substance; (2) high-specific surface area filtrate, to guarantee attached microbial abundant amount, is different from other type filtrate (as sand filtration) of same volume, thus ensure that higher pollutants removal rate; (3) air purge of upward flow is adopted during backwash; (4) according to the automatic backflushing washing procedure of embody rule demand optimization.
Last it is noted that the foregoing is only explanation of the present invention, be not limited to the present invention, although to invention has been detailed description, for a person skilled in the art, it still can be modified to aforementioned described technical scheme, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a combined water and air backwash system, comprise air water distribution chamber, back flushing air-water distribution tray and back flushing drainage tray, it is characterized in that: described air water distribution chamber is positioned at filter tank body bottom portion, back flushing air-water distribution tray and back flushing drainage tray are positioned at body side, filter tank, backwash gas water dispenser slot is below back flushing drainage tray, be provided with back flushing inlet pipe, back flushing water inlet pipe and rising pipe in described back flushing air-water distribution tray, back flushing water inlet pipe is connected with water distributing area bottom filter tank with inlet pipe; Back flushing drainage tray is positioned at above back flushing air-water distribution tray, and is communicated with by back-flushing drainage weir with biological filter; Described back flushing drainage tray is provided with backwashing wastewater pipe; Air water distribution chamber is arranged in the below of filter tank body filter plate, carries out water distribution and distribution by the filter that filter plate is installed; Back flushing air-water distribution tray is communicated with by air water dispensing orifice with air water distribution chamber.
2. combined water and air backwash system as claimed in claim 1, is characterized in that, adopt two filter tank bodies positioned opposite, the symmetrical distribution of air water distribution chamber; Backwash gas water dispenser slot is in the middle of two air water distribution chambers, and back flushing drainage tray is positioned in the middle of two filter tank bodies.
3. combined water and air backwash system as claimed in claim 1, it is characterized in that, back flushing drainage tray is communicated with by top back-flushing drainage weir with biological filter, and back-flushing drainage weir has wedge structure, is scarp towards side, biological filter.
4., based on a backwash technique for combined water and air backwash system described in claim 1, it is characterized in that, comprise the following steps:
(1) reduce liquid level to reduce discharge of wastewater, after controlling out water regulating valve filter tank liquid level is reduced to certain altitude, close out water regulating valve;
(2) air purge prepares, and introduces backwash air by back flushing inlet pipe, and back flushing air inlet can form air cushion layer under filter plate;
(3) air purge, by the filter of mounting arrangements on filter plate, uniform stream distribution is upwards flowed into filter bed, the backwash air of larger flow velocity increases the turbulivity in filter bed, discharge the suspended substance be trapped, and the microorganism that will filtrate adhere to peels off;
(4) air water combines flushing, and backwashing water upwards by filter bed by back flushing water inlet pipe, is caused filter bed expansion to a certain degree and presents fluidized state, and this expansion and fluidized state allow the suspended substance wash-out that is trapped going out;
(5) be vented, stop air feed and supply backwashing water, the static excess air effusion carried out in water;
(6) wash, open backwashing water, the waste water that back flushing produces will enter back flushing drainage tray, be discharged by backwashing wastewater pipe;
(7) back flushing terminates.
5. backwash technique as claimed in claim 4, is characterized in that, for the water of back flushing from the clean water basin of process water outlet.
6. backwash technique as claimed in claim 4, it is characterized in that, during step (6) backwash, V-type groove is still kept to intake, the surface intake by former water is assisted to sweep to wash and backwash in filtrate can be accelerated to be drained by backwashing wastewater pipe rapidly to the microbial film of the water surface and suspended substance, shortens the backwash saving of time water yield.
7. backwash technique as claimed in claim 4, is characterized in that, utilizes the wedge shape buffering effluent weir at back flushing drainage tray top, filterins media run-off when avoiding discharging backwashing wastewater.
8. backwash technique as claimed in claim 4, it is characterized in that, before step (1), detect working time and head loss, start according to system operation time or the head loss that presets, to certain hour or detect that head loss starts backwash process automatically lower than during preset value when running.
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| CN201510500294.9A CN105130105B (en) | 2015-08-14 | 2015-08-14 | A kind of combined water and air backwash system and technique |
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| CN201510500294.9A CN105130105B (en) | 2015-08-14 | 2015-08-14 | A kind of combined water and air backwash system and technique |
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Cited By (7)
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| CN107285522A (en) * | 2017-08-02 | 2017-10-24 | 金剑环保有限公司 | Air-water back-flushing pressure type constant-speed contact filter and back-flushing method thereof |
| CN109264938A (en) * | 2018-12-03 | 2019-01-25 | 苏伊士水务工程有限责任公司 | Carbon sand filter |
| CN110339604A (en) * | 2019-05-13 | 2019-10-18 | 陕西大唐水务有限责任公司 | A kind of filter tank water distribution gas distribution system |
| CN110683678A (en) * | 2019-10-28 | 2020-01-14 | 新疆天蓝水清环境服务有限公司 | Combined process for removing hardness of high-hardness high-salt-content concentrated water |
| CN111054113A (en) * | 2019-11-26 | 2020-04-24 | 内蒙古自治区水利科学研究院 | Self-cleaning micro-filtration device and self-cleaning filtration system |
| CN111115990A (en) * | 2020-03-13 | 2020-05-08 | 广东正诚环境科技有限公司 | Denitrification filter tank system |
| CN111320272A (en) * | 2020-04-02 | 2020-06-23 | 安徽华骐环保科技股份有限公司 | Multi-condition controlled automatic back-flushing device for denitrification biological filter and operation method thereof |
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| CN110683678A (en) * | 2019-10-28 | 2020-01-14 | 新疆天蓝水清环境服务有限公司 | Combined process for removing hardness of high-hardness high-salt-content concentrated water |
| CN111054113A (en) * | 2019-11-26 | 2020-04-24 | 内蒙古自治区水利科学研究院 | Self-cleaning micro-filtration device and self-cleaning filtration system |
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| CN111320272A (en) * | 2020-04-02 | 2020-06-23 | 安徽华骐环保科技股份有限公司 | Multi-condition controlled automatic back-flushing device for denitrification biological filter and operation method thereof |
| CN111320272B (en) * | 2020-04-02 | 2023-11-03 | 安徽华骐环保科技股份有限公司 | Operation method of automatic backwashing device of multi-condition controlled denitrification biological filter |
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