CN105668787B - Combined type multi-stage aeration biological filter tank and its sewage treatment process - Google Patents

Combined type multi-stage aeration biological filter tank and its sewage treatment process Download PDF

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Publication number
CN105668787B
CN105668787B CN201610050324.5A CN201610050324A CN105668787B CN 105668787 B CN105668787 B CN 105668787B CN 201610050324 A CN201610050324 A CN 201610050324A CN 105668787 B CN105668787 B CN 105668787B
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baf
backwash
water
level
water inlet
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CN105668787A (en
Inventor
刘波
姚芳
侯翔宇
孙信柏
梁子
丁新春
王德朋
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Nanjing University
Nanjing University Yancheng Environmental Protection Technology and Engineering Research Institute
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Nanjing University
Nanjing University Yancheng Environmental Protection Technology and Engineering Research Institute
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The present invention discloses a kind of combined type double-stage aeration bio-filter and its sewage treatment process, suitable for the underground integrated sewage treating equipment of rural domestic sewage treatment, filter tank main body is cylinder of steel shape, tank body center is the primary BAF for being filled with floating stuffing, sewage is aerated simultaneously into primary BAF, realize that to foul water fraction carbonization and ammonification and SS removal, center filter column periphery be to be filled with the zeolite filler two level BAF and three-level BAF being modified through sodium citrate;By controlling two level BAF dissolved oxygen, simultaneous nitrification and denitrification is realized, last sewage entered the further oxidation of organic compounds of three-level BAF, improved effluent quality;Three BAFs are equipped with independent back purge system, can independently carry out the backwash of different frequency varying strength;The present invention can complete carbonization, nitrification and denitrification reaction simultaneously, improve decarburization and the nitric efficiency of BAF.

Description

Combined type multi-stage aeration biological filter tank and its sewage treatment process
Technical field
The invention belongs to sewage treatment area, particularly a kind of combined type multi-stage aeration biological filter tank and based on the filter tank Sewage treatment process.
Background technology
BAF is the sewage-treatment plant risen late nineteen eighties the early 1990s, is used primarily for municipal sewage Tertiary treatment, rear develop into again are directly used in municipal sewage two stage treatment.It in biofilter mainly by being filled with difference The filtrate of particle diameter, bottom of pond are equipped with aerator, and sewage flows through filter material layer, and clean no membrane filtration bed grows biomembrane, completes biofilm Stage.Sewage flows through filter bed after the completion of biofilm, and pollutant first passes through physical absorption and ion exchange, and then by the micro- of filter material surface Biological oxidation is decomposed.The characteristics of biofilter maximum is that biological oxidation and Physical entrapment are filtered in one, without setting second pond, It is big with volumetric loading, the advantages that hydraulic detention time is short, and capital expenditure is few, and water quality is high.
BAF is quickly grown in recent years, and process form is constantly weeded out the old and bring forth the new, Publication No. CN 203498151 Patent text disclose a kind of complex biological filter, the filter tank is mainly made up of biochemical reaction tank and funnelform filtering ponds, biochemistry The bottom of reaction tank and the top of filtering ponds are fixed docking and are connected as a single entity, and the position close to bottom in biochemical reaction tank is fixed with First orifice plate, orifice plate are fixedly arranged above aeration head, and aeration head is covered by being laid on the ceramics filling layer above the first orifice plate, in mistake Position in filter tank close to bottom is fixed with the second orifice plate, and stone layer is equipped with the second orifice plate, stone is equipped with above stone layer Sand layer, outlet pipe is housed under the second orifice plate, the complex biological filter is simple and compact for structure, easy to clean, by biochemical reaction tank It is combined as a whole with filtering ponds;But the filter tank is only made up of biochemistry pool and filtering ponds, single biochemistry pool is difficult to complete carbonization, nitre Change and denitrification process, cause that water outlet COD, total nitrogen concentration are still higher, and treatment effeciency is relatively low.Imperfect backwash system System, easily cause filter tank blocking;Han Mei(" floating stuffing-zeolite BAF is ground to the removal behavior and mechanism of ammonia nitrogen in low temperature water Study carefully ", Harbin Institute of Technology's thesis for the doctorate, 2014)The filler for proposing not having to two kinds into particle diameter is loaded in a kind of reactor, Realize carbonation stage and the separation of nitrification stage, solve autotrophic bacterium and heterotroph and stop from generation to generation caused by increment time difference Time difference problem is stayed, but only solves the problems, such as filter tank carbonization and nitrification, is only nitrate nitrogen and nitrous state by ammonium oxidation Nitrogen, total nitrogen concentration is still higher, and denitrification denitrogenation problem is still present, and the filter tank floor space is larger, and pond body is higher, the energy Consumption is big, unsuitable popularization and application.
The content of the invention
Easily blocked for above-mentioned existing BAF, can not complete denitrification, water outlet total nitrogen is higher and carbonization The autotrophic bacterium generation proliferation period of heterotroph and nitrification backwashes the problem of frequency differs caused by differing, and the present invention provides a kind of Combined type multi-stage aeration biological filter tank and its technique, the biofilter, which is realized, splits carbonization and nitration denitrification, stable water outlet, What the present invention was realized in:
A kind of combined type multi-stage aeration biological filter tank, including can-like filter tank body are arranged at the water inlet pipe of filter tank body bottom and gone out Water pipe, the filter tank body bottom center are provided with cylindric primary BAF, and primary BAF outer end is from top to bottom It is divided into two level BAF and three-level BAF;
The first water inlet water-distributing device, the first aeration are sequentially provided between primary BAF and water inlet pipe from the bottom to top Device, the first perforated plate and the first rubble supporting layer;First perforated plate and the first rubble supporting layer are filtered through primary aeration and biological Extended to below pond below three-level aerating biological filter pool filler;The first backwash discharge pipeline is provided with first rubble supporting layer;
Primary BAF and two level BAF top flush, and are provided with the second perforated plate, and sewage is by entering After water pipe, the first water inlet water-distributing device enter primary BAF by the first perforated plate and the first rubble supporting layer, then By the second perforated plate, enter two by the second water inlet water-distributing device by the downflow weir for being arranged at primary BAF top Level BAF, check-valves is provided between downflow weir and the second water inlet water-distributing device, to prevent two level BAF Backwashing water is entered in primary BAF;
Two level BAF bottom is from top to bottom sequentially provided with the second aerator, the second rubble supporting layer and the 3rd Perforated plate, the firstth perforated plate two backwash discharge pipeline is provided with the second rubble supporting layer;Sewage is by two level BAF Bottom enters three-level BAF by the second rubble supporting layer and the 3rd perforated plate, three-level BAF bottom by The first rubble supporting layer has up to been followed successively by down and the first perforated plate, sewage are discharged after filtering, then by outlet pipe;
Primary BAF and two level BAF are equipped with independent back purge system, in order to be carried out to it The backwash of different frequency varying strength;Wherein primary BAF is additionally provided with the first backwash distribution device and first anti- Water inlet pipe is rinsed, compressed air enters primary BAF by the first backwash distribution device, and clear water is then anti-by first After flushing water inlet pipe enters primary BAF by the first water inlet water-distributing device, then by backwashing outlet pipe outflow, punching Sludge caused by washing is discharged by the first backwash discharge pipeline;Two level BAF is additionally provided with the second backwash gas distribution Device and the second backwash water inlet pipe, compressed air enter two level BAF, clear water by the second backwash distribution device After then entering two level BAF by backwash water inlet water-distributing device by the second backwash water inlet pipe, then pass through backwash Outlet pipe is flowed out, and sludge caused by flushing is discharged by the second backwash discharge pipeline;
Three-level BAF bottom is from top to bottom sequentially provided with the 3rd aerator and the 3rd backwash discharge pipeline, the Three backwash discharge pipelines are located in the first rubble supporting layer;
Three-level BAF is additionally provided with the 3rd backwash distribution device, the 3rd backwash water inlet pipe and the 3rd backwash Water inlet water-distributing device, compressed air enter three-level BAF by the 3rd backwash distribution device, and clear water then passes through the 3rd After backwash water inlet pipe enters three-level BAF via the 3rd backwash water inlet water-distributing device, then pass through outlet pipe stream Go out, sludge caused by flushing is discharged by the 3rd backwash discharge pipeline;
Wherein, it is the center filter column equipped with floating stuffing in the primary BAF, the floating stuffing is by living Property charcoal and polyvinyl chloride mixing obtain;Filler by being formed through sodium citrate modified zeolite is housed in two level BAF (Vast stretch of wooded country, Liu Quanli, sodium citrate modification on zeolite adsorb the influence research of low concentration carbon in water, nitrogen pollutant, and Beijing science and technology is big Learn, 2015), to reduce the running resistance in decarburization area, can be accumulated nitrification zone biomass again, improve carbonization and nitration reaction Efficiency.Backwash water amount and backwash drag losses can be reduced simultaneously;It is equipped with three-level BAF through lemon The filler of sour sodium modified zeolite composition, further improves effluent quality, alleviates because the impacts such as low temperature and high load capacity make effluent quality The problem of unstable.
Preferably, in the present invention, activated carbon and polychlorostyrene second that it is 5-7mm by particle diameter that the floating stuffing in the filter column of center, which is, Alkene by volume 3:7 mix.
Preferably, in the present invention, the particle diameter of filler is in the two level BAF and three-level BAF 1-3mm。
Preferably, the present invention in, in primary BAF first water inlet water-distributing device, second water inlet water-distributing device and 3rd water-distributing device and backwash water inlet water-distributing device are nozzle-type water-distributing device.
Preferably, in the present invention, the first rubble supporting layer and the second rubble supporting layer are using the broken of particle diameter 4-6cm Stone or cobble, and ballast grain sizes taper into from bottom to top, form rubble ponding layer;First rubble supporting layer and the second rubble are held Collector pipe and discharge pipeline are provided with support layer, drainpipe is that the first backwash drainpipe, the second backwash drainpipe and the 3rd are anti- Flush discharge pipe, drainpipe are used to exclude sewage caused by backwash, and discharge pipeline is the first backwash discharge pipeline, the second recoil Discharge pipeline and the 3rd backwash discharge pipeline are washed, for discharging sludge caused by backwash.
A kind of sewage treatment process based on the combined type double-stage aeration bio-filter, is comprised the following steps that:
A)Pending domestic sewage in rural areas is aerated by water inlet pipe by the first water inlet water-distributing device even into primary Behind biofilter, flowed up through floating stuffing and be aerated simultaneously, and entered by downflow weir and check-valves and be equipped with compared with flour filler Two level BAF, runs to three-level BAF still further below, is discharged by gravity by outlet pipe;
Wherein, dissolved oxygen concentration is 3-5mg/L in primary BAF, ensures to provide abundance for organic carbon Dissolved oxygen content;Two level BAF dissolved oxygen concentration is 0.6-1mg/L, to synchronously complete nitration denitrification;Three-level is aerated Biofilter dissolved oxygen concentration is 2-4mg/L, and sewage residence time in the body of can-like filter tank is 30-45min;
B)Back purge system is backwashed alternately using size, primary BAF is carried out every 5-10 days anti- Rinse, i.e., be first passed through compressed air from the first backwash distribution device to primary BAF, carry out air purge;Again by first Backwash water inlet pipe is uniformly passed through clear water to primary BAF by the first water inlet water-distributing device and washed, and backwashes Water outlet is flowed out by backwash outlet pipe, and sludge caused by washing is then discharged by the first backwash discharge pipeline;
C)Two level BAF is backwashed every 20-40 days, i.e., first from second backwash distribution device to Two level BAF is passed through compressed air, carries out air purge;Again by the second backwash water inlet pipe by backwashing water distribution of intaking Device is passed through uniform clear water to two level BAF and washed, and backwash water outlet is flowed out by backwash outlet pipe, water Sludge caused by washing then is discharged by the second backwash discharge pipeline;
d)Three-level BAF is backwashed every 30-60 days, i.e., first from the 3rd backwash distribution device to Three-level BAF is passed through compressed air, carries out air purge;Again by the 3rd backwash water inlet pipe by backwashing water distribution of intaking Device is passed through uniform clear water to three-level BAF and washed, and backwash water outlet is flowed out by backwash outlet pipe, water Sludge caused by washing then is discharged by the 3rd backwash discharge pipeline.
It is a kind of ground suitable for rural domestic sewage treatment that the present invention, which discloses a kind of combined type double-stage aeration bio-filter, Buried integrated sewage treating apparatus, compared with prior art, its advantage is embodied in:
(1)The present invention using underground integrated sewage treating equipment processing domestic sewage in rural areas, can synchronously be carbonized with Denitrogenation, treatment effect are higher.
(2)Floating stuffing, two level BAF and three-level aeration life are used in the primary BAF of the present invention The advantages of thing filter tank uses sodium citrate modified zeolite, and the technique has incorporated biological oxidation and zeolite adsorption, form collection fluidisation Bed process and fixed-bed process are in the biochemical materialization coupled system of one.
(3)Sewage is first into the filter column of primary BAF center, and the floating stuffing in the filter column of center is entering Filler is pushed up against in the presence of water waterpower and aeration lifting, center filter column upper part floating stuffing is in the extruding shape that suspends State, lower portion in suspended state, but with lower part filler retain suspension increase, bottom filler gravity be more than aeration and Hydraulic hoisting just starts to sink when acting on, and the biomembrane and suspension of aging are washed to be taken away from backwash collector pipe, bottom Floating stuffing rises again, so repeatedly, so as to extend the backwashing period of primary BAF;Simultaneously because aging Biomembrane and suspension sink take out of, will not enter in two level BAF, also reduce two level aeration and biological filter The blocked probability in pond.
(4)The present invention is provided with two level BAF and three-level BAF, and two level BAF is realized Synchronous nitration and denitrification, floating stuffing retention suspension and decomposition is oxidized in primary BAF, realization has The carbonization of machine thing, by the retention and oxidation of primary BAF, sewage is entered in two level BAF, passed through The dissolved oxygen content in two level BAF is controlled, two level BAF utilizes remaining organic matter and suitable dissolving Oxygen realizes synchronous nitration denitrification denitrogenation;Simultaneously three-level BAF, Ke Yijin are had in two level BAF One step aoxidizes the pollutants such as the ammonia nitrogen of low concentration, organic matter, effluent quality is further improved, can also alleviate biofilter and exist Go out the situation of water unstable under being impacted by low temperature, high load capacity etc..
(5)The combined type multi-stage aeration biological filter tank of the present invention is higher to the removal efficiency of organic matter, ammonia nitrogen and total nitrogen, COD(COD)Clearance reach more than 85%, for ammonia nitrogen removal frank up to more than 95%, the clearance of total nitrogen is also reachable 80%.Also there is certain clearance to hardly degraded organic substance and metal ion.
Brief description of the drawings
Fig. 1 is combined type multi-stage biological BAF structural representation of the present invention.
Fig. 2 is the subregion schematic diagram formed in present invention processing method for waste water.
In figure, 1, water inlet pipe;2nd, the second backwash water inlet pipe;3rd, backwash water inlet water-distributing device;4th, water outlet is backwashed Pipe;5th, the first backwash distribution device;6th, the first water inlet water-distributing device;7th, the first backwash discharge pipeline;8th, the first aerator; 9th, zeolite filler layer;10th, floating stuffing layer;11st, the second backwash discharge pipeline;12nd, the second aerator;13rd, the first perforated plate; 14th, the 3rd perforated plate;15th, water pump;16th, downflow weir;17th, the second water inlet water-distributing device;18th, the second rubble supporting layer;19th, Two perforated plates;20th, check-valves;21st, outlet pipe;22nd, the first backwash water inlet pipe;23rd, the second backwash distribution device;24th, Two backwash drainpipes;25th, can-like filter tank body;26th, primary BAF;27th, two level BAF;28th, three-level BAF;29th, the first rubble supporting layer;30th, the 3rd aerator;31st, the 3rd backwash water inlet water-distributing device;32、 3rd backwash discharge pipeline;33rd, the 3rd backwash distribution device;34th, the 3rd backwash water inlet pipe.
Embodiment
Embodiment 1
A kind of combined type double-stage aeration bio-filter, including can-like filter tank body 25, and it is arranged at the bottom of can-like filter tank body 25 The water inlet pipe 1 and outlet pipe 21 at end, the bottom center of can-like filter tank body 25 are provided with cylindric primary BAF 26, and primary exposes Filter tank body 25 is from top to bottom divided into two level BAF 27 and three-level BAF 28 by gas biofilter 26;Cylinder The diameter ratio of shape primary BAF and can-like filter tank body is 1:2;
The first water inlet water-distributing device 6, first is sequentially provided between primary BAF 26 and water inlet pipe 1 from the bottom to top Aerator 8, the first perforated plate 13 and the first rubble supporting layer 29;First perforated plate 13 and the first rubble supporting layer 29 both pass through The primary lower section of BAF 26 extends to the lower section of filler 18 in three-level BAF 28;First rubble supporting layer 29 In be additionally provided with the first backwash discharge pipeline;
Primary BAF 26 flushes with the top of two level BAF 27, and is provided with the second perforated plate 19, dirty Water enters primary aeration by the first perforated plate 13 and the first rubble supporting layer 29 by the water inlet water-distributing device 6 of water inlet pipe 1, first and given birth to Behind thing filter tank 26, then by the second perforated plate 19, by being arranged at the downflow weir 16 on the primary top of BAF 26 by Two water inlet water-distributing devices 17 enter in two level BAF 27, are provided between the water inlet water-distributing device 17 of downflow weir 16 and second Check-valves 20, to prevent the backwashing water in two level BAF 27 from entering in primary BAF 26;
The bottom of two level BAF 27 is from top to bottom sequentially provided with the second aerator 12, the second rubble supporting layer 18 With the 3rd perforated plate 14, the second backwash discharge pipeline 24 is provided with the second rubble supporting layer 18;Sewage is filtered by two level aeration and biological The bottom of pond 27 enters three-level BAF 28, three-level aeration and biological by the second rubble supporting layer 18 and the 3rd perforated plate 14 The bottom of filter tank 28 has from top to bottom been followed successively by the first rubble supporting layer 29 and the first perforated plate 13, filtered first perforated plate of sewage After 13, then discharged by outlet pipe 21;
Primary BAF 26, two level BAF 27 and three-level BAF 28 are respectively arranged with independent Back purge system, in order to carry out the backwash of different frequency varying strength to it;Wherein primary BAF 26 is provided with First backwash distribution device 5 and first backwashes water inlet pipe 22, and compressed air is entered primary by the first backwash distribution device 5 BAF 26, clear water then enter primary aeration by the first water inlet water-distributing device 6 by the first backwash water inlet pipe 22 and given birth to Behind thing filter tank 26, then flowed out by backwashing outlet pipe 4, sludge caused by flushing is discharged by the first backwash discharge pipeline 7;
Two level BAF 27 is additionally provided with the second backwash distribution device 33 and the 3rd backwash water inlet pipe 2, compression Air is entered in two level BAF 27 by the second backwash distribution device 23, and clear water then passes through the second backwash water inlet pipe After 2 enter two level BAF 27 by backwash water inlet water-distributing device 3, then flowed out by backwashing outlet pipe 4, rinse institute Caused sludge is discharged by the second backwash discharge pipeline 11;
The bottom of three-level BAF 28 is from top to bottom sequentially provided with the 3rd aerator 30 and the 3rd backwash spoil disposal Pipe 32, the 3rd backwash discharge pipeline 32 are located in the first rubble supporting layer 29;
Three-level BAF 28 is additionally provided with the 3rd backwash backwash water inlet distribution device of distribution device 33 and the 3rd 31, compressed air is entered in three-level BAF 28 by the 3rd backwash distribution device 33, and clear water then passes through the 3rd recoil After water inlet pipe 34 is washed via the 3rd backwash water inlet entrance three-level of water-distributing device 31 BAF 28, then pass through outlet pipe 21 Outflow, sludge caused by flushing are discharged by the 3rd backwash discharge pipeline 32;
Wherein, the center filter column 10 of floating stuffing is provided with primary BAF 26, the floating stuffing is by grain Footpath is 5-7mm activated carbon and polyvinyl chloride by volume 3:7 mix;Two level BAF 27 and three-level aeration It is equipped with biofilter 28 by through sodium citrate modified zeolite(Preparation method is referring to " vast stretch of wooded country, Liu Quanli, sodium citrate modification pair The influence research of low concentration carbon, nitrogen pollutant in zeolite adsorption water, University of Science & Technology, Beijing, 2015 ")The filler 9 of composition, filler 9 Particle diameter is 1-3mm, to reduce the running resistance in decarburization area, nitration denitrification area biomass can again accumulated, and improves carbonization With the efficiency of nitrification and denitrification reaction.Backwash water amount and backwash drag losses can be reduced simultaneously;Three-level aeration life Effluent quality is further improved in thing filter tank 28, alleviate because the impacts such as low temperature and high load capacity make effluent quality unstable the problem of.
In the present embodiment, the first water inlet water inlet water-distributing device 17 of water-distributing device 6, second in primary BAF 26 And backwash water inlet water-distributing device 3 is nozzle-type water-distributing device.
In the present embodiment, the first rubble supporting layer 29 and the second rubble supporting layer 18 using particle diameter 4-6cm rubble or Cobble, and ballast grain sizes taper into from bottom to top, form rubble ponding layer;First rubble supporting layer 29 and the second rubble support Collector pipe is provided with layer 18, the as first backwash discharge pipeline 7 and second backwashes discharge pipeline 11, produced for discharging backwash Sludge.
Embodiment 2
The combined type double-stage aeration bio-filter that the present embodiment is obtained using embodiment 1 handles certain domestic sewage in rural areas, its The COD concentration of sewage is 240mg/L, ammonia nitrogen concentration 32.1mg/L, nitrate 10mg/l.
Handling process is as follows:
A)Pending laboratory simulation water distribution is walked into water installations 6 by the first water inlet by water inlet pipe 1 and is uniformly sprinkled into primary BAF 26, intake and drive in the wrong direction by the floating stuffing in center filter column 10 and be aerated simultaneously upwards, pass through downflow weir 16 Enter with check-valves 20 and be equipped with compared with the two level BAF 27 of flour filler, run still further below to three-level BAF 28, discharged finally by gravity by outlet pipe 21;
Wherein, dissolved oxygen concentration is 3-5mg/L in primary BAF 26, ensures to provide abundance for organic carbon Dissolved oxygen content;The dissolved oxygen concentration of two level BAF 27 is 0.6-1mg/L, to synchronously complete nitration denitrification;Two level The dissolved oxygen concentration of BAF 27 is 2-4mg/L, and sewage residence time in can-like filter tank body 25 is 30-50min;
B)Back purge system is backwashed alternately using size, and primary BAF 26 is carried out every 5-10 days Backwash, i.e., compressed air first is passed through from the first backwash distribution device 5 to primary BAF 26, carries out air purge;Again Clear water is uniformly passed through from the first backwash water inlet pipe 22 into primary BAF 26 by the first water inlet water-distributing device 6 to enter Water-filling is washed, and backwash water outlet is flowed out by backwash outlet pipe 4, and sludge caused by washing then passes through the first backwash row of discharge pipeline 7 Go out;Backwash the limpid i.e. completion backwash process of water outlet.
Two level BAF 27 is backwashed every 20-40 days, i.e., first by the second backwash distribution device 23 Compressed air is passed through to two level BAF 27, carries out air purge;Intake again by the second backwash water inlet pipe 2 by backwashing Water-distributing device is passed through uniform clear water into 3 two level BAFs 27 and washed, and backwash water outlet is by backwash water outlet Pipe 4 is flowed out, and sludge caused by washing is then discharged by the second backwash discharge pipeline 24.Backwash the limpid i.e. completion backwash of water outlet Process.
Three-level BAF 28 is backwashed every 30-60 days, i.e., first by the 3rd backwash distribution device 33 Compressed air is passed through to three-level BAF 28, carries out air purge;The 3rd backwash is passed through by the 3rd backwash water inlet pipe 2 again Water inlet water-distributing device 31 is passed through clear water to three-level BAF 28 and washed, and clear water is flowed out by outlet pipe 21, washing production Raw sludge is then discharged by the 3rd backwash discharge pipeline 32.
In the present embodiment, filter tank volume is 5L, and run time is 6 months, and processing water is 2.5L/h, and water outlet has detected The removal efficiency of machine thing, ammonia nitrogen and total nitrogen is higher, COD(COD)Clearance reach more than 85%, ammonia nitrogen removal frank can Up to more than 95%, the clearance of nitrate nitrogen is also up to 80%.
Embodiment 3:
Present embodiment handles certain domestic sewage in rural areas using combined type multi-stage aeration biological filter tank, and inlet COD concentration is 200-300mg/L, ammonia nitrogen concentration 25-40mg/L, TN concentration are 40-60mg/L, and TP concentration is 4-7mg/L, 10-20mg/L Lead phthalic acid lipid material, turbidity 7-10NTU.
The present embodiment sewage run time is 6 months, and processing water is 2.5L/h, and primary BAF was every 7 days Once, every backwash in 15 days once, water outlet detects going for organic matter, ammonia nitrogen and total nitrogen to two level BAF for backwash Except rate reaches more than 85%, TP clearance 80% or so, the clearance of neck phthalic acid lipid material is more than 60%, turbid The clearance of degree can reach more than 90%.
Embodiment described above only expresses embodiments of the present invention, and its description is more specific and detailed, but can not Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that to those skilled in the art, do not taking off On the premise of from present inventive concept, some improvement can also be made, these improvement belong to protection scope of the present invention.

Claims (7)

1. a kind of combined type multi-stage aeration biological filter tank, including can-like filter tank body, the water inlet pipe positioned at filter tank body bottom and water outlet Pipe, it is characterised in that:The filter tank body bottom center is provided with cylindric primary BAF, the primary aeration and biological filter Filter tank body is from top to bottom divided into two level BAF and three-level BAF by pond;
The first water inlet water-distributing device, the first aeration dress are sequentially provided between primary BAF and water inlet pipe from the bottom to top Put, the first perforated plate and the first rubble supporting layer;First perforated plate and the first rubble supporting layer pass through primary BAF Lower section is extended to below three-level aerating biological filter pool filler;The first backwash discharge pipeline is provided with first rubble supporting layer;
Primary BAF and two level BAF top flush, and are provided with the second perforated plate, sewage by water inlet pipe, After first water inlet water-distributing device enters primary BAF by the first perforated plate and the first rubble supporting layer, then pass through the Two perforated plates, it is aerated by the downflow weir for being arranged at primary BAF top by the second water inlet water-distributing device into two level Biofilter, check-valves is provided between downflow weir and the second water inlet water-distributing device;
Primary BAF is additionally provided with the first backwash distribution device and the first backwash water inlet pipe, and compressed air is by first Backwash distribution device enters primary BAF, and clear water is then filled by the first backwash water inlet pipe by the first water inlet water distribution Put into after primary BAF, then flowed out by backwashing outlet pipe, sludge caused by flushing passes through the first recoil Wash discharge pipeline discharge;
Two level BAF bottom is from top to bottom sequentially provided with the second aerator, the second rubble supporting layer and the 3rd perforation Plate, the second backwash discharge pipeline is provided with the second rubble supporting layer;Sewage is broken by second by two level BAF bottom Stone supporting layer and the 3rd perforated plate enter three-level BAF, and three-level BAF bottom has from top to bottom been followed successively by First rubble supporting layer and the first perforated plate, sewage are discharged after the filtering of the first perforated plate, then by outlet pipe;
Two level BAF is additionally provided with the second backwash distribution device, the second backwash water inlet pipe and the second backwash water inlet Water-distributing device, compressed air enter two level BAF by the second backwash distribution device, and clear water then passes through the second recoil Wash water inlet pipe by backwash water inlet water-distributing device enter two level BAF after, then by backwash outlet pipe flow out, punching Sludge caused by washing is by the second backwash discharge pipeline discharge;
Three-level BAF bottom is from top to bottom sequentially provided with the 3rd aerator and the 3rd backwash discharge pipeline, and the 3rd is anti- Discharge pipeline is rinsed to be located in the first rubble supporting layer;
Three-level BAF is additionally provided with the 3rd backwash distribution device, the 3rd backwash water inlet pipe and the 3rd backwash water inlet Water-distributing device, compressed air enter three-level BAF by the 3rd backwash distribution device, and clear water then passes through the 3rd recoil Wash water inlet pipe to intake after water-distributing device enters three-level BAF via the 3rd backwash, then flowed out by outlet pipe, rushed Sludge caused by washing is by the 3rd backwash discharge pipeline discharge;
Wherein, the center filter column of floating stuffing is provided with the primary BAF, the floating stuffing is by activated carbon Mix and obtain with polyvinyl chloride;Two level BAF and three-level BAF are loaded through sodium citrate modified zeolite The filler of composition.
A kind of 2. combined type multi-stage aeration biological filter tank according to claim 1, it is characterised in that the primary aeration life The diameter ratio of thing filter tank and can-like filter tank body is 1:2.
3. a kind of combined type multi-stage aeration biological filter tank according to claim 1, it is characterised in that the floating stuffing is It is 5-7mm activated carbon and polyvinyl chloride by volume 3 by particle diameter:7 mix.
A kind of 4. combined type multi-stage aeration biological filter tank according to claim 1, it is characterised in that the two level aeration life The particle diameter of filler is 1-3mm in thing filter tank and three-level BAF.
5. a kind of combined type multi-stage aeration biological filter tank according to one of claim 1-4, it is characterised in that described first Water inlet water-distributing device, the second water inlet water-distributing device and backwash water inlet water-distributing device are nozzle-type water-distributing device.
6. a kind of combined type multi-stage aeration biological filter tank according to claim 5, it is characterised in that first rubble is held Layer and the second rubble supporting layer is ask to use particle diameter 4-6cm rubble, and ballast grain sizes taper into from bottom to top.
A kind of 7. sewage treatment process based on combined type multi-stage aeration biological filter tank described in claim 1, it is characterised in that tool Body step is as follows:
A)Pending domestic sewage in rural areas is intake into water-distributing device even into primary aeration and biological by water inlet pipe by first Behind filter tank, drive in the wrong direction by floating stuffing and be aerated simultaneously upwards, two level BAF is entered by downflow weir and check-valves, Run to three-level BAF, discharged by outlet pipe still further below;
Wherein, dissolved oxygen concentration is 3-5mg/L in primary BAF, and two level BAF dissolved oxygen concentration is 0.6-1mg/L, three-level BAF dissolved oxygen are 2-4mg/L, and sewage residence time in the body of can-like filter tank is 30- 45min;
B)Primary BAF is backwashed every 5-10 days, i.e., first exposed from the first backwash distribution device to primary Gas biofilter is passed through compressed air, carries out air purge;Again from the first backwash water inlet pipe by the first water inlet water-distributing device to first Level BAF is passed through clear water and washed, and clear water is flowed out by backwash outlet pipe, and sludge caused by washing is then by the One backwash discharge pipeline discharge;
C)Two level BAF is backwashed every 20-40 days, i.e., first backwashes distribution device to two level from second BAF is passed through compressed air, carries out air purge;Again by the second backwash water inlet pipe by backwashing water-distributing device of intaking Clear water is passed through to two level BAF to be washed, clear water is flowed out by backwash outlet pipe, and sludge then leads to caused by washing Cross the second backwash discharge pipeline discharge;
D)Three-level BAF is backwashed every 30-60 days, i.e., first backwashes distribution device to three-level from the 3rd BAF is passed through compressed air, carries out air purge;The 3rd backwash water inlet water distribution is passed through by the 3rd backwash water inlet pipe again Device is passed through clear water to two level BAF and washed, and clear water is flowed out by backwash outlet pipe, sludge caused by washing Then discharged by the second backwash discharge pipeline.
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CN106396081A (en) * 2016-11-21 2017-02-15 安徽清普环保装备有限公司 Continuous operation type reverse flow biological aerated filter
CN106517655A (en) * 2016-11-21 2017-03-22 安徽清普环保装备有限公司 Continuous running type reverse flow biological aerated filter sewage treatment system
CN106336005A (en) * 2016-11-21 2017-01-18 安徽清普环保装备有限公司 Continuous operation-type homodromous flow biological aerated filter
CN106430538B (en) * 2016-11-21 2019-09-06 安徽清普环保装备有限公司 A kind of continuous operating co-flow aeration biological filtering tank sewage disposal system
CN109205789B (en) * 2018-11-13 2021-08-31 中石化炼化工程(集团)股份有限公司 Aeration biological filtration sewage treatment device and sewage treatment system
CN110183035A (en) * 2019-05-13 2019-08-30 江苏大学 A kind of integrated sewage treating apparatus
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