CN104925948B - Immersion circulating biological filter tank reactor and sewage water treatment method - Google Patents
Immersion circulating biological filter tank reactor and sewage water treatment method Download PDFInfo
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- CN104925948B CN104925948B CN201510385451.6A CN201510385451A CN104925948B CN 104925948 B CN104925948 B CN 104925948B CN 201510385451 A CN201510385451 A CN 201510385451A CN 104925948 B CN104925948 B CN 104925948B
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Abstract
The invention discloses a kind of immersion circulating biological filter tank reactor and sewage water treatment method, wherein circulating biological filter tank reactor is arranged in cesspool, and circulating biological filter tank reactor includes：Filtrate is filled with tank body, tank body, tank body is located in cesspool position above wastewater level and is provided with delivery port, and tank body is located at wastewater level lower portion and is provided with water inlet；Extraction pipe, in tank body；Diffuser, located at the upper end of extraction pipe；Distributing device, located at the bottom of tank body, extraction pipe passes through distributing device；Aeration tube, the aeration section of aeration tube is located at bottom in tank body；Backwash air inlet pipe, is stretched into tank body, and the gas outlet of backwash air inlet pipe is located at extraction pipe bottom.The present invention saves the floor space of sewage disposal.
Description
Technical field
The present invention relates to technical field of sewage, specifically a kind of immersion circulating biological filter tank reactor and dirt
Method for treating water.
Background technology
BAF abbreviation BAF is the end of the eighties at a kind of New biological membrane method sewage that America and Europe grows up
Reason method, this method, which has, removes SS, COD, BOD, nitrification, denitrogenation, dephosphorization, the effect for removing AOX (harmful substance).Its advantage
It is as follows：1. one-time investment is lower than conventional method by 1/4；2. area occupied is the 1/10~1/5 of common process, and running cost is low by 1/5；
3. 50~60mg/L of inflow requirement suspension, is preferably combined with primary reinforcement processing, such as uses hydrolysis acidification pool；4. filtrate is more
Using haydite, diameter 5mm, 1.5~4m of floor height；5. water down, the reverse flow of gas up can not set second pond.
BAF (is active with organic loading height, small floor space compared with conventional activated sludge process
Sludge 1/3), small investment (save 30%), sludge bulking will not be produced, the advantages of oxygen efficiency of transmission is high, effluent quality is good,
But it is relatively tight (typically requiring SS≤100mg/L, best SS≤60mg/L) to water inlet SS requirements, therefore water inlet needs are carried out pre-
Processing.Meanwhile, its backwash water, the loss of flood peak are all larger.
In addition, BAF is as the new technology for integrating biological oxidation and retention suspended solid, after saving
Continuous sedimentation basin (second pond), big with volumetric loading, hydraulic load, hydraulic detention time is short, and required capital expenditure is few, water outlet water
Matter is good：Operation energy consumption is low, the characteristics of operating cost is few.
But existing BAF needs to be separately provided, and adds floor space.Simultaneously to existing sewage disposal
Transformation brings certain difficulty, it is difficult to carry out reasonable reformation on the basis of existing layout.
The content of the invention
In view of this, the embodiments of the invention provide a kind of immersion circulating biological filter tank reactor and sewage disposal side
Method.Main purpose is to save floor occupying area.
To reach above-mentioned purpose, present invention generally provides following technical scheme：
On the one hand, the embodiments of the invention provide a kind of immersion circulating biological filter tank reactor, immersion circulating biological
Filter tank reactor, it is characterised in that circulating biological filter tank reactor is arranged in cesspool, the circulating biological filter tank is anti-
Device is answered to include：
Filtrate is filled with tank body, tank body, tank body is provided with delivery port and water inlet, and delivery port is higher than sewage in cesspool
Water level, water inlet is located at filtrate area, and water inlet is less than wastewater level in cesspool；
Extraction pipe, in tank body, upper end exports for filtrate, and lower end is filtrate entrance；
Diffuser, located at the upper end of extraction pipe；
Distributing device, located at the bottom of extraction pipe, the extraction pipe passes through the distributing device；
Aeration tube, the aeration section of the aeration tube is located at the bottom in tank body；
Backwash air inlet pipe, the gas outlet of the backwash air inlet pipe is located at the lower section of the filtrate entrance of extraction pipe.
Preferably, the cloth conical surface of the distributing device is evenly equipped with solarization air cap, the aeration tube aeration section is located at distributing device
Interior bottom.
Preferably, a diameter of 3mm of the solarization air cap.
Preferably, the aeration section of the aeration tube is in horizontally disposed annular.
Preferably, the aeration section of the aeration tube includes stainless steel support pipeline and is coated on outside stainless steel support pipeline
Uniformly gather aerating pore on the film of wall, the film.
Preferably, being provided with inner sleeve in the tank body, annular space, the distributing device are formed between the inner sleeve and tank body
In inner sleeve, the water inlet is located at the annular space portion formed between inner sleeve and tank body.
Preferably, being provided with water inlet pipe in the tank body, water inlet pipe is connected with water inlet, and water inlet pipe goes out mouth down.
Preferably, the delivery port is the crest of weir positioned at tank body upper end, the crest of weir is Height Adjustable crest of weir.
Preferably, the material of the tank body is stainless steel.
On the other hand, the embodiments of the invention provide a kind of sewage water treatment method, using any of the above-described described immersion
Circulating biological filter tank reactor, the biofilter reactor is placed in cesspool, and the sewage water treatment method includes following step
Suddenly：
Purification process：Under aeration tube aeration oxygen supply condition, the air-flow that aeration is produced makes water level in tank body obtain lifting, high
In the water level of cesspool outside tank, the water of tank body internal upper part overflows tank body by the delivery port on tank body top, flows into cesspool, simultaneously
Sewage in cesspool is filled into tank body by water inlet, and through filtrate to tank body top, then overflow goes out tank body, into sewage
Pond, forms inner-outer circulation；When provided with inner sleeve, while sewage carries out inner-outer circulation, being aerated the air-flow produced will concentrate
Rise in inner sleeve interior zone, drive sewage in tank body to form interior circulation in the interior outside of inner sleeve, in inner sleeve and tank body
Between annular space portion form anaerobic zone, in interior sleeve inner formation aerobic zone, sewage constantly circulates by aerobic zone to anaerobic zone；
Backwash process：Backwash compressed gas, the water that backwash compressed gas drives are passed through into tank body by backwash air inlet pipe
Stream carries filtrate and sweeps along base sludge to be extracted upwards from extraction pipe lower end, and enters diffuser by extraction pipe upper end, now makes pottery
The biomembrane of grain filter material surface is completely separated with the sludge swept along under air water strong disturbance with filtrate, and the sludge after separation is exposing
Under gaseity, be suspended in reactor tank body upper water, with current from delivery port overflow tank body, into tank body on the outside of cesspool,
Sewage is in quiet heavy state in cesspool, and sludge settling is in the sludge hopper of cesspool bottom, and filtrate is equal under gravity
It is even to be scattered and by distributing device cloth.
Compared with prior art, the beneficial effects of the present invention are：
The immersion circulating biological filter tank reactor of the embodiment of the present invention is arranged in cesspool, the sewage in cesspool from
Water inlet on tank body is directly entered, and sewage supply equipment is set without extra, and the biofilter of the embodiment of the present invention is used
Extra land occupation, reduces floor space, is transformed beneficial to existing dirty processing place.And cost is low, change
Endless form, effect is good.
Brief description of the drawings
Fig. 1 is the structural representation of the immersion circulating biological filter tank reactor of inventive embodiments.
Embodiment
The present invention is described in further detail with reference to specific embodiment, but it is not as a limitation of the invention.
In the description below, what different " embodiment " or " embodiment " referred to is not necessarily same embodiment.In addition, one or more are implemented
Special characteristic, structure or feature in example can be combined by any suitable form.
Fig. 1 is the structural representation of the immersion circulating biological filter tank reactor of inventive embodiments.As shown in figure 1, submergence
Formula circulating biological filter tank reactor, the circulating biological filter tank reactor is arranged in cesspool 15, circulating biological filter tank reaction
Device includes：
Filtrate 2 is filled with tank body 1, tank body 1, tank body 1 is provided with delivery port 101 and water inlet 102, and delivery port 101 is high
In wastewater level 16 in cesspool 15, water inlet 102 is located at filtrate area, and water inlet 102 is less than wastewater level in cesspool 15
16；
Extraction pipe 6, in tank body 1, upper end exports for filtrate, and lower end is filtrate entrance；
Diffuser 9, located at the upper end of extraction pipe 6；
Distributing device 5, located at the bottom of extraction pipe 6, extraction pipe 6 passes through distributing device 5；
Aeration tube 11, the aeration section of aeration tube 11 is located at the bottom in tank body 1；
Backwash air inlet pipe 3, is stretched into tank body 1, and the gas outlet of backwash air inlet pipe 3 is located under the filtrate entrance of extraction pipe 6
Side.
The immersion circulating biological filter tank reactor of the embodiment of the present invention is arranged in cesspool, the sewage in cesspool from
Water inlet on tank body is directly entered, and sewage supply equipment is set without extra, and the biofilter of the embodiment of the present invention is used
Extra land occupation, reduces floor space, is transformed beneficial to existing dirty processing place.The circulation of the embodiment of the present invention
Biofilter is immersed in cesspool, changes water intake mode, and biomass is higher, improves treatment effect.
As the preferred of above-described embodiment, the cloth conical surface of distributing device 5 is evenly equipped with solarization air cap, the aeration section of aeration tube 11
In bottom in distributing device 5.A diameter of 3mm of solarization air cap.Set by this kind, distributing device 5 is provided simultaneously with uniform distribution and aeration
Function.During aeration, gas enters the bottom of distributing device 5 by aeration tube, and gas is fully contacted with the water of the bottom of distributing device 5,
The mixing wastewater with air time is long, improves the oxygen content in water, reaches saturated dissolved oxygen.By equal on the cloth conical surface of distributing device 5
The solarization air cap of cloth is aerated, and makes aeration more uniform.When avoiding using aeration tube, gas is from the less weakness of biomass
Discharge, causes not to be aerated, is aerated uneven.The aeration section of aeration tube is in horizontally disposed annular.The aeration section bag of aeration tube
Include stainless steel support pipeline and be coated on the film that stainless steel supports pipeline outer wall, uniformly gather aerating pore on film.Cloth
Device 5 sets solarization air cap, and the bottom by the aeration section of aeration tube 11 in distributing device 5, and now aeration process is as follows：It is aerated section
It is aerated, air fully contacts to form strong mixing wastewater with air stirring action with the water of bottom in distributing device 5, improves in water
Oxygen content, form gas liquid mixture, unnecessary air overflows water body, the upper space formation one in distributing device 5 is under water
Air chamber, then along the solarization air cap uniform secondary on the cloth conical surface of distributing device be spread in outside filter material layer in, with filtrate and
The water body of filtrate interlayer is fully contacted；The gas liquid mixture of lower space (contains saturation after aeration diffusion in water in distributing device simultaneously
Dissolved oxygen) in the filter material layer that is also spread in the presence of blast pressure along solarization air cap on the outside of distributing device, at this moment, in distributing device
A liquid circulation process is formed between internal and outside filtrate, and this process is beneficial to influent quality and evenly distributes and divide
Cloth.The distributing device 5 can realize filtrate (Gu) uniform, air (gas) and the uniform of aeration effect, the distribution of liquid (liquid) water quality be uniform
Deng three comprehensive functions, the important internal monomer members that circulating biological filter tank reactor is used are to ensure that.
As the preferred of above-described embodiment, inner sleeve 4 is provided with tank body 1, annular space, cloth are formed between inner sleeve 4 and tank body 1
Glassware 5 is located in inner sleeve 4, and water inlet 102 is located at the annular space portion formed between inner sleeve 4 and tank body 1.The present embodiment is by setting
Putting inner sleeve 4 makes accessing pending water in the inside and outside formation partial circulating of inner sleeve 4, and distribution and water distribution are adjusted, real in tank body
Existing complete A/O functions, i.e., the annular space portion formed between inner sleeve 4 and tank body 1 forms anaerobic zone (A sections), in inner sleeve 4
Formed aerobic zone (O sections).Embodiment improves wastewater treatment efficiency.
As the preferred of above-described embodiment, water inlet pipe 7 is provided with tank body 1, water inlet pipe 7 is connected with water inlet 102, water inlet pipe
7 go out mouth down.The present embodiment exports water inlet pipe 7 directed downwardly by setting, and sewage is first flowed downward after entering tank body 1, so
It is upward through filtrate 2 again afterwards, makes biological of the sewage fully with being grown on filtrate 2.In addition, the water inlet pipe 7 of the present embodiment with
After inner sleeve 4 is combined, partial circulating of the sewage in tank body 1 is promoted, helps to realize complete A/O functions in tank body 1.
As the preferred of above-described embodiment, delivery port 101 is the crest of weir positioned at the upper end of tank body 1.The clear water on top can be direct
It is discharged in cesspool 15, realizes and the effluent cycle in cesspool is handled.Wherein, crest of weir uses Height Adjustable crest of weir.It is logical
Control of the height realization of crest of weir to water yield is overregulated, and then controls the water level 8 and effluent cycle processing speed in tank body 1.
As the preferred of above-described embodiment, the material of tank body 1 is stainless steel.Using well prepared in advance hair of stainless steel materials
The circulating biological filter tank of bright embodiment, then to be mounted directly in cesspool.Certainly it can also be realized using concreting
Pre-manufactured, it is rear to install, it is convenient and swift.
Water inlet 102 is generally four, is uniformly distributed on the side wall of tank body 1.Certainly, except being arranged on the side of tank body 1
Water inlet 102 on wall, can also set water inlet in the bottom of tank body 1.
Diffuser 9 uses folded plate type diffuser, folded plate type diffuser upper end and the closed company of tank body 1 in the embodiment of the present invention
Connect.Certainly, diffuser 9 can be using any suitable diffuser in the prior art.
The inwall of tank body 1 is provided with support member 12, for supporting distributing device.Support member 12 can be in step-like, in order to
Inner sleeve 4 is supported simultaneously.Support member can be vertically disposed supporting plate.
Filtrate 2 is spherical haydite or column type active carbon particles or other suitable spherical filtrates and granule filter material.
Backwash air inlet pipe 3 in the embodiment of the present invention can be stretched into tank body 1 from any position, as long as backwash air inlet pipe 3
Gas outlet be located at extraction pipe 6 filtrate entrance lower section.Shown in figure in embodiment, central tube 10 is provided with tank body,
Backwash air inlet pipe 3 and extraction pipe 6 are in central tube 10, to be protected to backwash feed pipe 3 and extraction pipe 6.
Tank body 1 is fixed by fixed mount 13 with cesspool 15 in the present embodiment.Fixed mount 13 is horizontal in the upper of cesspool 15
End, the top of tank body 1 is fixed with fixed mount 13.
The bottom of cesspool 15 is provided with discharge pipeline 14.Periodically the sludge for depositing to the bottom of cesspool 15 can be discharged.
The cesspool 15 of the circulating biological filter tank reactor of multiple setting embodiment of the present invention is used in conjunction, it is possible to achieve to sewage
Multistep treatment.
On the other hand, the embodiments of the invention provide a kind of sewage water treatment method, the method for the present embodiment uses above-mentioned
Immersion circulating biological filter tank reactor described in one embodiment, biofilter reactor is placed in cesspool, the present embodiment
Sewage water treatment method comprises the following steps：
Purification process：Under aeration tube aeration oxygen supply condition, the air-flow that aeration is produced makes water level in tank body obtain lifting, high
In the water level of cesspool outside tank, the water of tank body internal upper part overflows tank body by the delivery port on tank body top, flows into cesspool, simultaneously
Sewage in cesspool is filled into tank body by water inlet, and through filtrate to tank body top, then overflow goes out tank body, into sewage
Pond, forms inner-outer circulation；When provided with inner sleeve, while sewage carries out inner-outer circulation, being aerated the air-flow produced will concentrate
Rise in inner sleeve interior zone, drive sewage in tank body to form interior circulation in the interior outside of inner sleeve, in inner sleeve and tank body
Between annular space portion form anaerobic zone, in interior sleeve inner formation aerobic zone, sewage constantly circulates by aerobic zone to anaerobic zone；
Backwash process：Backwash compressed gas, the water that backwash compressed gas drives are passed through into tank body by backwash air inlet pipe
Stream carries filtrate and sweeps along base sludge to be extracted upwards from extraction pipe lower end, and enters diffuser by extraction pipe upper end, now makes pottery
The biomembrane of grain filter material surface is completely separated with the sludge swept along under air water strong disturbance with filtrate, and the sludge after separation is exposing
Under gaseity, be suspended in reactor tank body upper water, with current from delivery port overflow tank body, into tank body on the outside of cesspool,
Sewage is in quiet heavy state in cesspool, and sludge settling is in the sludge hopper of cesspool bottom, and filtrate is equal under gravity
It is even to be scattered and by distributing device cloth.
The biofilter reactor of the embodiment of the present invention has following cyclic process in use.
First circulation process：Sewage is followed with the inside and outside of sewage after processing in the reactor tank body of circulating biological filter tank in cesspool
Ring；
The submergence of reactor tank body is positioned in sewage pool body, and under aeration oxygen supply condition, water level will be lifted in tank body
Rise, higher than the water level of cesspool outside tank body, by the height adjustable water outlet crest of weir on tank body top, the top in tank body is dirty after handling
Water will quantitatively overflow tank body, flow into cesspool top；Because tank body lower part sets water inlet (general to be circumferentially uniformly arranged 4, bottom
Portion sets 1) communicated with cesspool, under the effect of similar air lift principle, supplement is entered reactor by the sewage of cesspool bottom
Tank interior, through filtrate to tank body top, then overflow goes out tank body, into cesspool, forms inner-outer circulation.
According to this cyclic process, plural serial stage handling process can be used, each single-stage cesspool is communicated with mouth, until end
Cesspool water outlet is held, substantially without the loss of flood peak；And multiple reactors can be also installed in single-stage cesspool, such arrangement can
Obtain handling the water outlet of more high-quality, successfully solve multiple tank body arrangements and big yield modular combination application problem.
Second circulation process：The repeats itself (interior circulation) of sewage in the reactor tank body of circulating biological filter tank；
It is aerated in reactor tank body by setting in inner sleeve, tank body by bottom, air-flow will focus on inner sleeve inner area
Domain rises, and drives sewage in tank body to form circulation in the interior outside of inner sleeve, on condition that Control strain water, makes inner sleeve air-flow
The quantity of circulating water of drive, which is more than, overflows water.
Based on this cyclic process, distinguished by interior outside aeration and the non-aeration of inner sleeve, in whole process tank body
Filtrate in form aerobic zone and anaerobic zone, sewage is constantly circulated by aerobic zone to anaerobic zone, if sewage is realized in aerobic zone
After nitration reaction processing, the nitrate ion in sewage will enter anaerobic zone with current, then contain abundant carbon source with cesspool
Anaerobic zone mixing of the sewage in tank body, will occur anti-nitration reaction, reaches the treatment effect of removing total nitrogen.
3rd cyclic process：Under backwash state, upper and lower circulation of the filtrate in filter material layer in tank body；
Cesspool is not intake, now into the backwash state of system, and the compressed air entered by backwash air inlet pipe drives
Current, current drive filtrate to be flowed up in extraction pipe by tank base, and filtrate sweeps along base sludge, passes through tank body top
After diffuser, filtrate uniformly becomes scattered about the top of filter bed under gravity；Biomembrane of filter material surface is with sweeping along during this
Sludge be completely separated under air water strong disturbance with filtrate, the sludge after separation is suspended in reactor tank under aeration state
In body upper water, reactor tank body is overflowed with current, into tank body on the outside of cesspool, sewage is in quiet heavy state in cesspool,
Sludge settling is in the sludge hopper of cesspool bottom, and periodically suction is discharged into sludge treating system.
After backwash operation certain time (about 1-2 hours), system can enter normal process in running status, regain
The processing water outlet of high-quality.
Above example is only the exemplary embodiment of the present invention, is not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can make respectively in the essence and protection domain of the present invention to the present invention
Modification or equivalent substitution are planted, this modification or equivalent substitution also should be regarded as being within the scope of the present invention.
Claims (10)
1. immersion circulating biological filter tank reactor, it is characterised in that circulating biological filter tank reactor is arranged at cesspool
Interior, circulating biological filter tank reactor includes：
Filtrate is filled with tank body, tank body, tank body is provided with delivery port and water inlet, and delivery port is higher than sewage water in cesspool
Position, water inlet is located at filtrate area, and water inlet is less than wastewater level in cesspool；
Extraction pipe, in tank body, upper end exports for filtrate, and lower end is filtrate entrance；
Diffuser, located at the upper end of extraction pipe；
Distributing device, located at the bottom of extraction pipe, the extraction pipe passes through the distributing device, and described inner tank wall is provided with support
Part, the described distributing device for supporting；
Aeration tube, the aeration section of the aeration tube is located at the bottom in tank body；
Backwash air inlet pipe, the gas outlet of the backwash air inlet pipe is located at the lower section of the filtrate entrance of extraction pipe.
2. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that the cloth of the distributing device
The conical surface is evenly equipped with solarization air cap, and the aeration tube aeration section is located at bottom in distributing device.
3. immersion circulating biological filter tank reactor according to claim 2, it is characterised in that the diameter of the solarization air cap
For 3mm.
4. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that the aeration of the aeration tube
Section is in horizontally disposed annular.
5. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that the aeration of the aeration tube
Section includes stainless steel and supports pipeline and be coated on the film that stainless steel supports pipeline outer wall, and the uniform aeration that gathers is micro- on the film
Hole.
6. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that provided with interior in the tank body
Sleeve, forms annular space between the inner sleeve and tank body, the distributing device is located in inner sleeve, and the water inlet is located at inner sleeve
The annular space portion formed between tank body.
7. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that be provided with the tank body into
Water pipe, water inlet pipe is connected with water inlet, and water inlet pipe goes out mouth down.
8. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that the delivery port be positioned at
The crest of weir of tank body upper end, the crest of weir is Height Adjustable crest of weir.
9. immersion circulating biological filter tank reactor according to claim 1, it is characterised in that the material of the tank body is
Stainless steel.
10. sewage water treatment method, described using the immersion circulating biological filter tank reactor described in claim any one of 1-9
Biofilter reactor is placed in cesspool, and the sewage water treatment method comprises the following steps：
Purification process：Under aeration tube aeration oxygen supply condition, the air-flow that aeration is produced makes water level in tank body obtain lifting, higher than tank
The water level of outer cesspool, the water of tank body internal upper part overflows tank body by the delivery port on tank body top, cesspool is flowed into, while sewage
Sewage in pond is filled into tank body by water inlet, and through filtrate to tank body top, then overflow goes out tank body, into cesspool,
Form inner-outer circulation；When provided with inner sleeve, while sewage carries out inner-outer circulation, the air-flow that aeration is produced will focus on interior
Sleeve inner region rises, and drives sewage in tank body to form interior circulation in the interior outside of inner sleeve, between inner sleeve and tank body
Annular space portion form anaerobic zone, in interior sleeve inner formation aerobic zone, sewage constantly circulates by aerobic zone to anaerobic zone；
Backwash process：Backwash compressed gas is passed through into tank body by backwash air inlet pipe, the current that backwash compressed gas drives are taken
Band filtrate simultaneously sweeps along base sludge to be extracted upwards from extraction pipe lower end, and enter diffuser by extraction pipe upper end, and now haydite is filtered
The biomembrane for expecting surface is completely separated with the sludge swept along under air water strong disturbance with filtrate, and the sludge after separation is in aeration shape
Under state, be suspended in reactor tank body upper water, with current from delivery port overflow tank body, into tank body on the outside of cesspool, sewage
Sewage is in quiet heavy state in pond, and sludge settling is in the sludge hopper of cesspool bottom, and filtrate uniformly dissipates under gravity
Fall and by distributing device cloth.
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| CN201510385451.6A CN104925948B (en) | 2015-06-30 | 2015-06-30 | Immersion circulating biological filter tank reactor and sewage water treatment method |
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|---|---|---|---|
| CN201510385451.6A CN104925948B (en) | 2015-06-30 | 2015-06-30 | Immersion circulating biological filter tank reactor and sewage water treatment method |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL308989A1 (en) * | 1995-06-08 | 1996-12-09 | B Donald E Prazmowski | Biological bed |
| CN1314605C (en) * | 2005-05-27 | 2007-05-09 | 湖北大学 | Domestic sewage denitrifying-dephosphorizing method and apparatus |
| CN201046930Y (en) * | 2006-09-21 | 2008-04-16 | 江苏博大环保股份有限公司 | Reentrant flow inner loop aeration biological filter tank |
| CN102849848B (en) * | 2012-09-26 | 2014-03-05 | 北京市环境保护科学研究院 | Inner circulation bio-filter reactor and sewage treatment method |
| CN204981335U (en) * | 2015-06-30 | 2016-01-20 | 重庆云图工程技术有限公司 | Submergence formula circulation biological filter reactor |
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