CN101244867A - Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water - Google Patents
Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water Download PDFInfo
- Publication number
- CN101244867A CN101244867A CNA2008100270289A CN200810027028A CN101244867A CN 101244867 A CN101244867 A CN 101244867A CN A2008100270289 A CNA2008100270289 A CN A2008100270289A CN 200810027028 A CN200810027028 A CN 200810027028A CN 101244867 A CN101244867 A CN 101244867A
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- filter
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000000463 material Substances 0.000 title claims description 73
- 238000000034 method Methods 0.000 title description 2
- 239000002245 particle Substances 0.000 claims abstract description 54
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 239000000706 filtrate Substances 0.000 claims description 40
- 238000011010 flushing procedure Methods 0.000 claims description 39
- 230000000813 microbial Effects 0.000 claims description 13
- 238000011001 backwashing Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 11
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical compound 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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a down-flow biological aerated filter with double-layer filter media and a method to apply the filter for processing raw water. The biological aerated filter is characterized in that a large-particle filter layer, a small-particle filter layer and a gravel layer are arranged in order below a backwash effluent groove in the biological aerated filter; a processing aeration device is arranged in the gravel layer; the particle size of filter media at the large-particle filter layer is from eight to sixteen mm with a smaller filter media density than the small-particle filter layer; the particle size of filter media at the lower small-particle filter layer is from four to eight mm. For the method, raw water enters into the filter through a water distribution channel, flows downward through the lightweight large-particle filter layer and small-particle filter layer and the gravel layer, and flows out through a filter head arranged at a filter plate. The down-flow biological aerated filter with double-layer filter media has the advantages of small water head loss and long backwash cycle, and therefore is an economical and efficient method in the biological pretreatment technology for microbiological polluted drinking water sources.
Description
Technical field
The present invention relates to BAF, particularly relate to the BAF that is used for the micro-polluted drinking water water source purifying, be specifically related to be used for falling the streaming double-layer filter material aerating biological filter and using the method for the former water of this filter tank pre-treatment of micro-polluted drinking water water source Biological Pretreatment.
Background technology
BAF is a kind of novel sewage disposal technology that grows up late 1980s, and this technology adopts the particulate filler of high-specific surface area as biofilm carrier, and the microbial biomass of unit pond body is many, it is big to handle load, effluent quality is good, follow-uply need not establish secondary sedimentation basins, and floor space is little, initial cost is economized, and owing to adopt modular construction, the level of automation height is easy to management, also being convenient to the later stage changes, extends, and has at home and abroad obtained in the sewage disposal using widely.In recent years, because the urban drinking water source organic contamination is serious day by day, and China's Urban water supply water quality standard increases, press for and in " coagulation-precipitation-sand filtration-sterilization " city water treatment process of routine, introduce the Biological Pretreatment technology, organism in the former water and ammonia nitrogen are handled the corresponding source quality standard that reaches.And BAF has obtained people's attention and research gradually owing to have numerous advantages in the application of city water Biological Pretreatment.
BAF structure and conventional rapid filter are similar, and comparing has just increased blast aeration system.BAF can be divided into flow lifting type and fall two kinds of forms of streaming by water (flow) direction.Flow lifting type is that the bottom-up water distributing area via body bottom, pond of former water flows into filter material layer by filter.Owing to often contain a large amount of impurity or the hydrobiont that grows for the former water in the water pretreatment, under the situation of long-time running, take place easily to stop up the situation that current are not smooth, processing efficiency is low, system can't move that causes because of filter.For preventing that filter from stopping up, must carry out strict pre-treatment to former water, this has just significantly increased construction and running cost.Fall the streaming BAF and do not have the problems referred to above, but because general BAF employing is that particle diameter is the small-particle ceramic grain filter of Φ 3～5mm, a large amount of suspended substance in service, turbidity are retained down by the upper strata filtrate, cause the filtrate upper strata to be covered by foundry loam at short notice and form hardening layer, head loss increases fast, to carry out back flushing continually to the filter tank thereby force, increased running cost, also influenced simultaneously the normal growth of metabolism cycle, and then influenced ammonia-N removal rate than long nitrifier.
Summary of the invention
The objective of the invention is to overcome the defective that existing BAF is applied to feed water and exists in the Biological Pretreatment, provide a kind of avoid that filter stops up, cost is low, head loss is little the streaming double-layer filter material aerating biological filter falls.
Another object of the present invention is to provide the method for using this BAF pretreating micro-polluted raw water.
Central Plains of the present invention water is without the pretreated drinking water source that is subjected to light contamination.
Purpose of the present invention is achieved through the following technical solutions:
A kind of streaming double-layer filter material aerating biological filter that falls, the distributing trough in described filter tank is positioned at both sides, body top, pond, body middle part, pond is provided with the back flushing effluent trough than the lower slightly place of distributing trough, back flushing effluent trough below is provided with macrobead filter material layer, small-particle filter material layer and cobble supporting layer successively, the technology aerating apparatus is located in the cobble supporting layer, cobble supporting layer below is a filter plate, filter plate is provided with a plurality of filters, be provided with back flushing water and air distributing district under the filter plate, rising pipe, back flushing inlet pipe and back flushing water inlet pipe are communicated with back flushing water and air distributing district respectively; The particle diameter of filter medium of described macrobead filter material layer is 8～16mm, and density is less than the filtrate density of small-particle filter material layer, and the particle diameter of filter medium of lower floor's small-particle filter material layer is 4～8mm.
The thickness of described macrobead filter material layer and small-particle filter material layer equates.
The selected filtrate of described macrobead filter material layer and small-particle filter material layer is a biological ceramic particle.
Use method of falling streaming double-layer filter material aerating biological filter pretreating micro-polluted raw water of the present invention: having gas blower the filter tank to be carried out under the situation of aeration by the technology aerating apparatus, former water enters in the body of pond from distributing trough, and flow downward, suspended impurity when excessive particle diameter, light-weight macrobead filter material layer in the former water and turbidity and shellfish and algae hydrobiont are held back, and simultaneously the microbial film of growing on the macrobead filter material layer is to the removal of degrading of part ammonia nitrogen and organism in the former water; Former subsequently water enters the small-particle filter material layer, under biomembrane biochemistry and lower floor's filtrate cut-off filter dual function, most ammonia nitrogen, organism, turbidity and algae and the microbial film that comes off are removed in the water, former then water is through the cobble supporting layer, flow out by the filter that is installed on the filter plate again, enter the back flushing water and air distributing district of bottom, filter tank, deliver to conventional processing system of water factory by rising pipe at last; When needing back flushing, backwashing water and backwash gas are introduced into back flushing water and air distributing district, passing filter and filter plate more upwards flows, successively by the cobble supporting layer, macrobead filter material layer and small-particle filter material layer, under the washing away of high-intensity backwashing water and backwash gas, aged microbial film and entered the back flushing effluent trough by the impurity that filtrate is held back with current and outwards discharge on the filtrate, and the filtrate of macrobead filter material layer and small-particle filter material layer is owing to exist density variation, after back flushing finishes, the relative lighter upper strata filtrate of density falls to the top of lower floor's filtrate, promptly returns to original stratified situation up and down.
Principle of the present invention: the present invention has adopted the BAF form of falling streaming, has avoided the susceptible to plugging situation of common flow lifting type BAF filter.Simultaneously filtrate is divided into two-layer up and down, the upper strata is the macrobead filtrate, compare the small-particle filtrate and can hold back and hold impurity or the hydrobiont that contains in the how former water, prevent the upper strata filtrate from being covered by foundry loam at short notice and form hardening layer, slow down the growth of head loss, prolonged the backwashing period in filter tank.And lower floor adopts the small-particle filtrate, because it has bigger specific surface area, for the mass transfer that adheres to superincumbent microbial growth, organism and ammonia nitrogen and dissolved oxygen has been created necessary condition, can keep bigger biomass and stable biologic chain, thereby the assurance filter tank can be moved efficiently and stably.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention falls the streaming double-layer filter material aerating biological filter and filtrate is divided into two-layer up and down, the upper strata is the macrobead filtrate, compare the small-particle filtrate and can hold back and hold impurity or the hydrobiont that contains in the how former water, prevent the upper strata filtrate from being covered by foundry loam at short notice and form hardening layer, slow down the growth of head loss, prolonged the backwashing period in filter tank.
2, filter material layer difficult hardening in streaming double-layer filter material aerating biological filter surface falls in the present invention, and filter is difficult for stopping up, and does not need strict pre-treatment, has saved investment.
3, it is little that the head loss of streaming double-layer filter material aerating biological filter falls in the present invention, and backwashing period is long, and operational and administrative expenses is low.
Description of drawings
Fig. 1 is that streaming double-layer filter material aerating biological filter structural representation falls in the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described, but embodiments of the invention are not limited thereto.
As shown in Figure 1, be used for the pretreated streaming double-layer filter material aerating biological filter that falls of micro-polluted raw and comprise pond body 1, distributing trough 2, back flushing effluent trough 3, macrobead filter material layer 4, small-particle filter material layer 5, cobble supporting layer 6, technology aerating apparatus 7, filter 8, filter plate 9, back flushing water and air distributing district 10, micro-polluted raw water inlet pipe 11, rising pipe 12, back flushing inlet pipe 13 and back flushing water inlet pipe 14;
Distributing trough 2 is positioned at both sides, pond body 1 top, and the water inlet in the micro-polluted raw water inlet pipe 11 flows into distributing trough 2.Body 1 middle part in pond is omited lower than distributing trough 2 and is provided with back flushing effluent trough 3, back flushing effluent trough 3 belows are provided with macrobead filter material layer 4, small-particle filter material layer 5 and cobble supporting layer 6 successively in the pond body 1, technology aerating apparatus 7 is located in the cobble supporting layer 6, cobble supporting layer 6 belows are filter plate 9, filter plate 9 is provided with a plurality of filters 8, be back flushing water and air distributing district 10 under the filter plate 9, rising pipe 12, back flushing inlet pipe 13 and back flushing water inlet pipe 14 are connected with back flushing water and air distributing district 10 respectively.
The technology aerating apparatus 7 in filter tank is made up of aeration tube and the aeration head that is installed on the aeration tube.Pressurized air is discharged in the pond by aeration head through aerated conduit from gas blower.
Among Fig. 1, the particle diameter of filter medium that falls the macrobead filter material layer 4 of streaming double-layer filter material aerating biological filter filling is 8～16mm, and density is less than the filtrate density of granule filter material layer 5, and the particle diameter of filter medium of lower floor's small-particle filter material layer 5 is 4～8mm.The thickness of macrobead filter material layer 4 and small-particle filter material layer 5 can equate or not wait, and can determine by test at different source qualities.Macrobead filter material layer 4 and small-particle filter material layer 5 selected materials are biological ceramic particle.Because haydite has higher reference area, makes that the microorganism in the former water adheres in its surface easily, form comparatively stable microbial film through accumulation, the former pollutant in water of can degrading reaches the purpose that purifies water.
Use of the present invention when falling streaming double-layer filter material aerating biological filter pretreating micro-polluted raw water, there is being gas blower to be undertaken under the situation of aeration by 7 pairs of filter tanks of technology aerating apparatus, former water enters in the pond body 1 from distributing trough 2, and flow downward, suspended impurity when excessive particle diameter, light-weight macrobead filter material layer 4 in the former water and turbidity and hydrobionts such as shellfish and algae are held back, simultaneously on the macrobead filter material layer 4 microbial film of growth to the removal of degrading of part ammonia nitrogen and organism in the former water; Enter the small-particle filter material layer 5 of small particle size subsequently, under biomembrane biochemistry and small-particle filter material layer 5 cut-off filter dual functions, most ammonia nitrogen, organism, turbidity and algae and the microbial film that comes off are removed in the water, pass through cobble supporting layer 6 then, flow out by the filter 9 that is installed on the filter plate 8 again, enter the back flushing water and air distributing district 10 of bottom, filter tank, deliver to conventional processing system of water factory by rising pipe 12 at last.When needing back flushing, the backwashing water 14 of higher-strength and backwash gas 13 are introduced into back flushing water and air distributing district 10, passing filter 9 and filter plate 8 more upwards flows, successively by cobble supporting layer 6, lower floor's filtrate 5 and upper strata filtrate 4, under the washing away of high-intensity backwashing water and backwash gas, aged microbial film and entered back flushing effluent trough 3 by the impurity that filtrate is held back with current and outwards discharge on the filtrate.And macrobead filter material layer 4 and small-particle filter material layer 5 be owing to exist density variation, and after back flushing finished, the macrobead filter material layer 4 that density is lighter relatively fell to the top of small-particle filter material layer 5, promptly returned to original stratified situation up and down.
Of the present invention when falling streaming double-layer filter material aerating biological filter pretreating micro-polluted raw water, owing to adopted the BAF form of falling streaming, avoided the susceptible to plugging situation of common flow lifting type BAF filter.Simultaneously filtrate is divided into two-layer up and down, the upper strata is the macrobead filtrate, compare the small-particle filtrate and can hold back and hold impurity or the hydrobiont that contains in the how former water, prevent the upper strata filtrate from being covered by foundry loam at short notice and form hardening layer, slow down the growth of head loss, prolonged the backwashing period in filter tank.And lower floor adopts the small-particle filtrate, because it has bigger specific surface area, for the mass transfer that adheres to superincumbent microbial growth, organism and ammonia nitrogen and dissolved oxygen has been created necessary condition, can keep bigger biomass and stable biologic chain, thereby the assurance filter tank can be moved efficiently and stably.And upper strata filtrate density is little than lower floor's filtrate, finishes the back filtrate in back flushing and still can keep original stratified situation up and down.
The present invention falls streaming double-layer filter material aerating biological filter surface filtering layer and is difficult for hardening, filter is difficult for stopping up, do not need strict pre-treatment, saved investment, and head loss is little, backwashing period is long, operational and administrative expenses is low, can effectively remove organism and ammonia nitrogen in the micro-polluted drinking water water source, impurity and suspended substance in the cut-off filter water, realization improves the target of raw water quality, is a kind of cost-effective method in the micro-polluted drinking water water source Biological Pretreatment technology.
Claims (4)
1, a kind of streaming double-layer filter material aerating biological filter that falls, the distributing trough that it is characterized in that described filter tank is positioned at both sides, body top, pond, body middle part, pond is provided with the back flushing effluent trough than the lower slightly place of distributing trough, back flushing effluent trough below is provided with macrobead filter material layer, small-particle filter material layer and cobble supporting layer successively, the technology aerating apparatus is located in the cobble supporting layer, cobble supporting layer below is a filter plate, filter plate is provided with a plurality of filters, be provided with back flushing water and air distributing district under the filter plate, rising pipe, back flushing inlet pipe and back flushing water inlet pipe are communicated with back flushing water and air distributing district respectively; The particle diameter of filter medium of described macrobead filter material layer is 8～16mm, and density is less than the filtrate density of small-particle filter material layer, and the particle diameter of filter medium of lower floor's small-particle filter material layer is 4～8mm.
2, the streaming double-layer filter material aerating biological filter that falls according to claim 1 is characterized in that: the thickness of described macrobead filter material layer and small-particle filter material layer equates.
3, the streaming double-layer filter material aerating biological filter that falls according to claim 1, it is characterized in that: the filtrate of described macrobead filter material layer and small-particle filter material layer is a biological ceramic particle.
4, application rights requires the 1 described former water method of streaming double-layer filter material aerating biological filter pre-treatment of falling, it is characterized in that, former water enters in the body of pond from distributing trough, and flow downward, suspended impurity when excessive particle diameter, light-weight macrobead filter material layer in the former water and turbidity and shellfish and algae hydrobiont are held back, and simultaneously the microbial film of growing on the macrobead filter material layer is to the removal of degrading of part ammonia nitrogen and organism in the former water; Former subsequently water enters the small-particle filter material layer, under biomembrane biochemistry and lower floor's filtrate cut-off filter dual function, most ammonia nitrogen, organism, turbidity and algae and the microbial film that comes off are removed in the water, former then water is through the cobble supporting layer, flow out by the filter that is installed on the filter plate again, enter the back flushing water and air distributing district of bottom, filter tank, deliver to conventional processing system of water factory by rising pipe at last; When needing back flushing, backwashing water and backwash gas are introduced into back flushing water and air distributing district, passing filter and filter plate more upwards flows, successively by the cobble supporting layer, macrobead filter material layer and small-particle filter material layer, under the washing away of high-intensity backwashing water and backwash gas, aged microbial film and entered the back flushing effluent trough by the impurity that filtrate is held back with current and outwards discharge on the filtrate, and the filtrate of macrobead filter material layer and small-particle filter material layer is owing to exist density variation, after back flushing finishes, the relative lighter upper strata filtrate of density falls to the top of lower floor's filtrate, promptly returns to original stratified situation up and down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100270289A CN101244867B (en) | 2008-03-25 | 2008-03-25 | Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water |
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| CN2008100270289A CN101244867B (en) | 2008-03-25 | 2008-03-25 | Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water |
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| CN101244867B CN101244867B (en) | 2011-08-17 |
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| CN101637672B (en) * | 2009-08-17 | 2011-07-20 | 东莞市华清净水技术有限公司 | Precipitation technology applicable to treatment of river sewage, urban sewage and industrial sewage |
| CN102502945A (en) * | 2011-11-18 | 2012-06-20 | 大连得达科技发展有限公司 | Biological aerated filter for sewage processing |
| CN101734829B (en) * | 2009-12-29 | 2012-07-25 | 上海亚同环保实业股份有限公司 | Biological nitrogen and phosphorus removal process of sewage and matched device of V-shaped biological aerated filter pool |
| CN102923918A (en) * | 2012-11-23 | 2013-02-13 | 佛山市水业集团有限公司 | Method and device for removing high concentration ammonia nitrogen in drinking water |
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