CN103086501A - Double-layer filter material biological aerated filter - Google Patents
Double-layer filter material biological aerated filter Download PDFInfo
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- CN103086501A CN103086501A CN2011103468471A CN201110346847A CN103086501A CN 103086501 A CN103086501 A CN 103086501A CN 2011103468471 A CN2011103468471 A CN 2011103468471A CN 201110346847 A CN201110346847 A CN 201110346847A CN 103086501 A CN103086501 A CN 103086501A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a double-layer filter material biological aerated filter, which is mainly composed of a water inflow distribution device, a support layer, a double filter material layer, a process aerating device, a backwash aerating device, a central drainage device, and a water outlet; and is characterized in that: a piece of equipment is filled with filter materials of coarse and fine different diameters to form a double filter material layer, which is used for realizing simultaneous decarburization and nitrification functions, the central drainage device is arranged at a place of junction of the upper and lower filter material layer, the branch pipe of a central drainage pipe is opened with small holes for discharging backwash sludge, and two lower layers can make use of different backwash modes. The double-layer filter material biological aerated filter has the advantages that: (1) decarburization and nitrification functions can be simultaneously achieved in a BAF, the filter has a high removal rate for organic matters and ammonia nitrogen, the backwash water consumption is low; and (2) the gas-water ratio is low and only of 2:1-6:1, the operating cost is low, the floor space is small, the system is simple, and the investment is small.
Description
Technical field
The invention belongs to waste disposal plant, particularly a kind of a kind of double-layer filter material aerating biological filter that low concentration sewage is processed.
Background technology
BAF (BAF) is the sewage treatment process that rises at the end of the eighties and the beginning of the nineties, at first as tertiary treatment, after develop into and be directly used in second-stage treatment.It uses the particulate filter of rough porous, and the filter material surface growth has microbial film, and aeration is provided at the bottom of the pond, and during the effluent stream filter bed, at first pollutent is filtered and adsorbs, and then is decomposed by the microbiological oxidation of filter material surface.Its maximum characteristics are to integrate bio-oxidation and hold back suspended substance, have saved the post precipitation pond, have a volumetric loading large, and hydraulic detention time is short, and initial cost is few, the effluent quality advantages of higher.The patented product BIOFOR technique of France Degremont S.A generally adopts 3-5 two haydites as filtrate, is divided into two-stage; The neat soldier of Tsing-Hua University has proposed by force the method for the incomplete back flushing of a kind of BAF first in its Tsing-Hua University Ph D dissertation of calendar year 2001 " BAF (BloFoR) is processed the sanitary sewage pilot scale research ".
But these have shortcoming, and main manifestations is:
(1) adopt the filtrate of same particle size range.So, if particle diameter is too small, easily stop up, and particle diameter is excessive, the filtrate external surface area is less, and biomass is little, and processing efficiency is low, and both are difficult for taking into account.(2) cycle of operation is short.Because the heterotrophic bacterium sludge age is short, growth causes increasing very fast near head loss in the filtering layer of water inlet rapidly, need frequent back flushing, if the back flushing water distribution is inhomogeneous, be prone to the phenomenon of filtrate bonding, can cause at last the filter tank effluent quality to worsen, resistance rises, the maintenance of stopping transport of having to.(3) BloFOR is difficult for back flushing.Backwash intensity is large, backwash water amount large (maximum can reach 40%), the backwash time is long, and after back flushing time of recovery grow (＞Zh).(4) be unfavorable for completing simultaneously decarburization and nitrification function.If the removal of organism and ammonia nitrogen is completed in an equipment, will due to heterotrophic bacterium growth rapidly, need frequent backwash and affect the growth of nitrifier.If decarburization and nitrification function are completed in the BAF of two series windings, because organic matter removal has just been completed in very short zone, therefore at normal flow 4-6m/h, the height of decarbonization section is very low, causes the waste of equipment; Improve filtering velocity increase load if rely on, can increase kinetic equation loss, shorten backwashing period, uneconomical equally.
Summary of the invention
Main purpose of the present invention is to provide a kind of double-layer filter material aerating biological filter, described biological filter mainly is comprised of water inlet distribution device, supporting layer, double filtering layer, technique aerating apparatus, back flushing distribution device, middle part water-freeing arrangement, water outlet, it is characterized in that: the filtrate of thick, the thin different-grain diameter of filling in an equipment, form the double filtering layer, be used for realizing simultaneously decarburization and nitrification function.And be positioned at the intersection of upper and lower filter material layer, and intermediate drain installation is installed, open aperture on middle comb Zhi Guanbi, be used for discharging the mud of backwash.The upper and lower two-layer of double-layer filter material aerating biological filter can be taked different backwash modes.
The height thick, thin two-layer filtrate of described filling is divided into thick, lower thin or equal or opposite.The bottom is the filtrate of coarse grain footpath 4-6mm, is used for improving the water environment capacity in filter tank, extends the periodic duty time in filter tank; The filtrate of top filling fine grain size 1-3mm is used for increasing the specific surface area of filtrate, thereby improves the nitrifier biomass that adheres to, and improves ammonia nitrogen removal frank.
Described two-layer filtrate can be the same filtrate, also can be the approximate different sorts filtrate of density, and its shape both can be the filtrate of rule, also can be irregular filtrate.
Described backwash mode adopts large and small back flushing alternately, carries out a big bounce after every 5-7 little back flushing and washes, and the front little back flushing of first carrying out is washed in each big bounce.Its backwash process is: during back flushing, pressurized air enters from gas inlet 4, by the back flushing distribution device " evenly distribute, clear water enters from back flushing water-in 8.During little back flushing, backwashing sludge is discharged by water port 7, is discharged by water port 6 when big bounce is washed.After the filter tank head loss reaches the cangue height, unite with pressurized air and water outlet and carry out back flushing, can put into operation after the water that washes out clarification that recoils.
The invention has the beneficial effects as follows that the present invention both can reduce the running resistance in decarburization district, the nitrification zone biomass is accumulated, improve nitrification efficiency; Also can reduce in addition backwash water amount and back flushing drag losses, after the shortening back flushing, effluent quality reaches the stable time.Compared with prior art,
The advantage that the present invention has is: (1) can realize decarburization and nitrification function simultaneously in a BAF, organism and ammonia nitrogen are had higher clearance.COD (chemical oxygen demand (COD)) clearance is more than 80%, ammonia nitrogen removal frank can reach 95% (2) operation and the backwash resistance little, the cycle of operation is long, backwash water consumes low.Running resistance generally can not surpass Zm, and 24h just needs the once little backwash of rushing, and 5-7 all after date just needs a big bounce to wash, and back flushing consumes in 10% from water.(3) after small reverse washing, recovery normal operating condition required time is short, in 2h.(boundless) gas-water ratio is low, and only 2: 1-6: 1, working cost is low.(5) with respect to two-stage BAF, floor space is little, and system is simple, less investment.
Description of drawings
Fig. 1 is double-layer filter material aerating filter tank structure schematic diagram.
Embodiment
Figure 1 shows that double-layer filter material aerating filter tank structure schematic diagram.Double-deck BAF mainly is comprised of top filter material layer 1, bottom filter material layer 2, supporting layer 11, porous plate water inlet distribution device 12, technique aerating apparatus 10, back flushing distribution device 13, and at the intersection that is positioned at upper filter material layer 1 and lower filter material layer 2, intermediate drain installation 7 is installed, perforate 14 on the branch pipe wall of middle comb 7, be convenient to the upper and lower two-layer of double-layer filter material aerating biological filter and can take different backwash modes, and the mud when being used for draining little back flushing.Filtrate at bottom filling coarse grain footpath 4-6mln is used for improving the water environment capacity in filter tank, extends the periodic duty time in filter tank; Filtrate at top filling fine grain size 1-3nun is used for increasing the specific surface area of filtrate, thereby improves the biomass of nitrifier, improves ammonia nitrogen removal frank.During operation, sewage enters from water-in 9, by water inlet distribution device 12, passes supporting layer n, removes suspended substance, cOD, BOD through bottom filter material layer 2 and top filter material layer 1.After (biochemical oxygen demand (BOD)) and ammonia nitrogen, discharge from water outlet 5, pressurized air enters by 3 simultaneously, by technique aerating apparatus 10 aerations, for microorganism growth provides oxygen; During backwash, pressurized air enters from gas inlet 4, evenly distributes by back flushing distribution device 13, and clear water enters from backwash water-in 8.During small reverse washing, backwashing sludge is discharged by water port 7, discharges by 6 during big reverse washing.Just carried out once little back flushing in general 24 hours, its process is for first closing water outlet 5, open middle row's mouth 7, emptying top water, first the gas take intensity as (10-15) L/m2.s carries out gas back flushing 2-4min, again take water intensity as (8-12) L/m, 5 carry out air water with washing 3-6min together with gas, totally put into operation with the water rinse of same intensity.Through 5-7 all after dates, then big bounce washes once, and its process and little back flushing are basic identical.(be generally about 1-Zm) after the filter tank head loss reach a certain height and unite with pressurized air and water outlet and carry out back flushing, back flushing can put into operation after going out clarification of water.
Specific embodiment
The below enumerates two embodiment again, and the present invention is further described:
Embodiment 1: the processing of low concentration sanitary sewage (COD concentration is 100-25Omg/L): the bottom particle diameter of filter medium is 4-6mm, and density is (1800-2200) kg/m3, is highly 1-1.5m; The top filtrate is 2-3mm, and density is (1800-2200) kg/m3,, be highly 2-3m.Operation water flow velocity 2-3m/h, water-gas ratio is 1: 3-1: 6.The method that the large and small back flushing of this process using replaces is carried out back flushing, approximately carries out a big bounce after the individual little back flushing of 5-7 and washes.The combined water and air backwash mode is all adopted in large and small back flushing.Removal efficiency is about 80% left and right, and the COD clearance is about 80% left and right, and the clearance of ammonia nitrogen is 80-95%.
Embodiment 2: and the processing of extremely low concentration sanitary sewage (COD concentration＜100mg/L): the bottom particle diameter of filter medium is 3-5mm, and density is (1800-2200) kg/m3,, be highly 1-1.5m; The top filtrate is 1 one 3mm, and density is (1800-2200) kg/m,, be highly 2-3m.Operation water flow velocity 3-6m/h, water-gas ratio is 1: 2-1: 4.The method that the large and small back flushing of this process using replaces is carried out back flushing, approximately carries out a big bounce after 5-7 little back flushing again and washes.The combined water and air backwash mode is all adopted in large and small back flushing.Removal efficiency is about 80% left and right, and the COD clearance is about 80% left and right, and the clearance of ammonia nitrogen is 80-95%.
Claims (4)
1. double-layer filter material aerating biological filter, described biological filter mainly is comprised of water inlet distribution device, supporting layer, double filtering layer, technique aerating apparatus, back flushing distribution device, middle part water-freeing arrangement, water outlet, it is characterized in that: the filtrate of thick, the thin different-grain diameter of filling in an equipment, form the double filtering layer, be used for realizing simultaneously decarburization and nitrification function, and be positioned at the intersection of upper and lower filter material layer, intermediate drain installation is installed, open aperture on middle comb Zhi Guanbi, be used for discharging the mud of backwash.The upper and lower two-layer of double-layer filter material aerating biological filter can be taked different backwash modes.
2. double-layer filter material aerating biological filter according to claim 1, it is characterized in that: the height of the two-layer filtrate of thickness of described filling is divided into thick, lower thin or equal or opposite, the bottom is the filtrate of coarse grain footpath 4-6mm, be used for improving the water environment capacity in filter tank, extend the periodic duty time in filter tank; The filtrate of top filling fine grain size 1-3Inm is used for increasing the specific surface area of filtrate, thereby improves the nitrifier biomass that adheres to, and improves ammonia nitrogen removal frank.
3. double-layer filter material aerating biological filter according to claim 1, it is characterized in that: described two-layer filtrate can be the same filtrate, also can be the approximate different sorts filtrate of density, and its shape both can be the filtrate of rule, also can be irregular filtrate.
4. double-layer filter material aerating biological filter according to claim 1, it is characterized in that: described backwash mode adopts large and small back flushing alternately, carries out big reverse washing one time after every 5-7 little back flushing, first carries out little back flushing before big reverse washing at every turn.Its backwash process is: during back flushing, pressurized air enters from gas inlet (4), evenly distribute by back flushing distribution device (13), clear water enters from back flushing water-in (8), during little back flushing, backwash mud is discharged by water port (7), when washing, big bounce discharged by water port (6), after the filter tank head loss reaches the 1-Zm height, to unite with pressurized air and water outlet and carry out back flushing, back flushing can put into operation after going out clarification of water.
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| CN2011103468471A CN103086501A (en) | 2011-11-07 | 2011-11-07 | Double-layer filter material biological aerated filter |
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| CN2011103468471A CN103086501A (en) | 2011-11-07 | 2011-11-07 | Double-layer filter material biological aerated filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359826A (en) * | 2013-08-08 | 2013-10-23 | 苏州蓝澈环境工程有限公司 | Aeration biological filter |
| CN106115818A (en) * | 2016-08-31 | 2016-11-16 | 陈师楚 | A kind of spiral lamina pressure tank |
| CN111871018A (en) * | 2020-09-01 | 2020-11-03 | 国投信开水环境投资有限公司 | Filter structure of filter tank and multi-layer filter material filter tank |
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2011
- 2011-11-07 CN CN2011103468471A patent/CN103086501A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359826A (en) * | 2013-08-08 | 2013-10-23 | 苏州蓝澈环境工程有限公司 | Aeration biological filter |
| CN103359826B (en) * | 2013-08-08 | 2015-05-06 | 苏州蓝澈环境工程有限公司 | Aeration biological filter |
| CN106115818A (en) * | 2016-08-31 | 2016-11-16 | 陈师楚 | A kind of spiral lamina pressure tank |
| CN111871018A (en) * | 2020-09-01 | 2020-11-03 | 国投信开水环境投资有限公司 | Filter structure of filter tank and multi-layer filter material filter tank |
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Application publication date: 20130508 |