CN105984940A - Sewage processing method and sewage processing device - Google Patents
Sewage processing method and sewage processing device Download PDFInfo
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- CN105984940A CN105984940A CN201610149495.3A CN201610149495A CN105984940A CN 105984940 A CN105984940 A CN 105984940A CN 201610149495 A CN201610149495 A CN 201610149495A CN 105984940 A CN105984940 A CN 105984940A
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- groove
- intermittent aerating
- aeration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a sewage processing method and a sewage processing device which can perform effectively nitrogen processing and phosphorus filtering processing along with a film. The sewage processing method comprises steps of introducing processed water into an intermittence aeration tank (10) to perform repeated aeration and aeration pausing, performing an intermittence process of biological processing through active mud, delivering water which is constituted by biological processing water and active mud and contains mud from the intermittence aeration tank to perform film filtering process, enabling the water containing mud in a film separation tank (20) to flow back to the intermittence aeration tank (10). In the sewage processing method, a plurality of intermittence aeration tanks (10) are used and controlled to operate, so that more than one intermittence aeration tanks (10) is are the aeration state during the sewage processing peirod. Flowing and backflow are performed between the intermittence aeration tank 10 and the film separation tank (20) under the aeration state.
Description
Technical field
The present invention relates to combine intermittent aerating and the sewage water treatment method of membrane separation activated sludge process and sewage-treatment plant.
Background technology
Nitrogenous, the sewage that phosphorus amount is high that herding, food, chemical plant etc. are discharged, it is desirable to the nitrogen of height processes or phosphorus processes
Technology.
As nitrogen process, it is known that have the methods such as nitrification liquid circulation method, endogenous denitrogenation, intermittent aerating method.
In nitrification liquid circulation method, nitrogen removal efficiency depends on circulating ratio.Therefore, in order to obtain higher nitrogen removal efficiency, it is necessary to
Improve circulating ratio, but the nitrogen removal efficiency limit of reality is about 80%.
In endogenous denitrogenation, owing to carrying out denitrogenation processing in the nitrification operation second half section by adding the Organic substances such as methanol, can obtain
To higher nitrogen removal efficiency.But, add the problem that methanol causes cost increase.
On the other hand, the device of intermittent aerating method constitutes simple, it is not necessary to nitrification liquid circulates, and can obtain higher nitrogen removal efficiency.
Additionally, also have the intermittent aerating membrane separation activated sludge process being combined with membrane separation activated sludge process (for example, referring to patent documentation
1、2)。
In intermittent aerating membrane separation activated sludge process, such as shown in Figure 12, using to possess has intermittent aerating groove 10 and membrance separation
The sewage-treatment plant 2 of groove 20, is carried out a biological disposal upon by activated sludge in intermittent aerating groove 10, at membrance separation groove 20
In carry out membrane filtration.Concrete, the processed waters such as nitric wastewater are imported intermittent aerating groove 10, intermittently carries out at aeration
Reason.Carry out during aeration is nitration reaction, and carry out during stopping aeration is denitrification reaction.In intermittent aerating groove 10
Be made up of biological treatment of water and activated sludge containing sludge water, be transported to membrance separation groove 20, by being arranged at membrance separation groove
The filter membrane that the membrane module 22 of 20 is possessed, carries out membrane filtration.Additionally, with the continuation of membrane filtration, activated sludge is dense
Contracting, therefore generally during carrying out membrane filtration, by return flow line 27, by the part in membrance separation groove 20 containing sludge water from
Membrance separation groove 20 is back to intermittent aerating groove 10 so that follow between intermittent aerating groove 10 and membrance separation groove 20 containing sludge water
Ring.
Prior art literature
Patent documentation
[patent documentation 1] Japanese Patent Laid-Open 7-100486 publication
[patent documentation 2] Japanese Patent Laid-Open 2005-211728 publication
Summary of the invention
But, in above-mentioned intermittent aerating membrane separation activated sludge process, there is problems with.
Generally, in membrane filtration, spue air from the diffuser 21 being arranged at below membrane module 22, in making membrance separation groove 20
Aeration.Therefore, it is back to the dissolved oxygen content (DO) containing sludge water of intermittent aerating groove 10 from membrance separation groove 20 higher.
Such as shown in Figure 13 (a), it is combined with in the nitric wastewater processing method of intermittent aerating and membrane separation activated sludge process,
In stopping during aeration (in denitrogenation) also can carry out the circulation containing sludge water, high DO containing sludge water from membrance separation groove 20
If being back to intermittent aerating groove 10, it is difficult to form anaerobic state necessary to denitrogenation in intermittent aerating groove 10, it is difficult to fill
Divide and remove nitrogen.
In order to maintain anaerobic state, as shown in Figure 13 (b), can in stopping during aeration also stopper film filter, stop
Circulation containing sludge water.
But, if in stopping during aeration, also stopper film filters, the membrane filtration time can shorten the corresponding time, therefore processes
Efficiency declines.In order to maintain treatment effeciency, it is also possible to the membrane area of consideration increasing filter membrane, but cost increase, the most not
Economical.
Additionally, carry out also must there be anaerobic condition when phosphorus processes, above-mentioned identical problem can be produced.
The present invention makees in view of the foregoing, it is therefore an objective to provides and can efficiently realize nitrogen process and phosphorus process and membrane filtration process
Sewage water treatment method and sewage-treatment plant.
The present invention has following form.
[1] a kind of sewage water treatment method, is the method processing sewage by intermittent aerating membrane separation activated sludge process, has: will
Processed water imports intermittent aerating groove, aeration is repeated and stops aeration, being carried out the interval carried out a biological disposal upon by activated sludge
Aeration operation；Membrance separation will be transported to by what biological treatment of water and activated sludge constituted containing sludge water in intermittent aerating groove
Groove, carries out the membrane filtration operation of membrane filtration；Make the part in membrance separation groove be back to interval containing sludge water from membrance separation groove to expose
The reflow process of air drain；In the method, use multiple described intermittent aerating groove, control the operating of each intermittent aerating groove so that
Sewage disposal has the intermittent aerating groove of more than 1 groove to be aeration state during carrying out；Intermittent aerating groove under aeration state and film
Between separating tank, carry out the transport containing sludge water and backflow.
[2] according to the sewage water treatment method described in [1], wherein, the quantity of intermittent aerating groove is set to n, intermittent aerating operation
In aeration time be set to t1, stop aeration time and be set to the greatest common divisor of t2, t1 and t2 when being set to a, meet following formula (1).
N=t1/a+t2/a ... (1)
[3] according to the sewage water treatment method described in [2], wherein, enter between intermittent aerating groove and the membrance separation groove under aeration state
The transport containing sludge water of row and the time started of backflow, the time started of the aeration being later than in this intermittent aerating groove.
[4] according to the sewage water treatment method described in [1]～[3] any one, wherein, the aeration of each intermittent aerating groove is controlled,
The operating time point making all intermittent aerating grooves is different.
[5] a kind of sewage-treatment plant, is the device being processed sewage by intermittent aerating membrane separation activated sludge process, possesses and have:
It is imported with processed water, aeration is repeated and stops aeration, being carried out the intermittent aerating groove carried out a biological disposal upon by activated sludge；
To the membrance separation groove carrying out membrane filtration containing sludge water being made up of biological treatment of water and activated sludge in intermittent aerating groove；Make
Obtain the part in membrance separation groove and be back to the reflux of intermittent aerating groove containing sludge water from membrance separation groove；In this device, possess
Having multiple described intermittent aerating groove, the operating of each intermittent aerating groove is controlled so that sewage disposal carry out period have 1 groove with
On intermittent aerating groove be aeration state；Between intermittent aerating groove and membrance separation groove under aeration state, carry out containing sludge water
Transport and backflow.
[6] according to the sewage-treatment plant described in [5], wherein, the aeration of each intermittent aerating groove is controlled so that all
The operating time point of aeration tank of having a rest is different.
Sewage water treatment method according to the present invention, it is possible to achieve efficient nitrogen processes, phosphorus processes and processes together with membrane filtration.
Additionally, according to the sewage-treatment plant of the present invention, it is possible to achieve efficient nitrogen processes, phosphorus processes and processes together with membrane filtration.
Accompanying drawing explanation
The schematic configuration diagram of sewage-treatment plant one example of [Fig. 1] display present invention.
[Fig. 2] shows the time chart of operating time point one example of the intermittent aerating groove of 2 grooves.
[Fig. 3] shows the time chart of operating time point one example of the intermittent aerating groove of 3 grooves.
[Fig. 4] shows the time chart of operating time point one example of the intermittent aerating groove of 4 grooves.
[Fig. 5] shows the time chart of operating other examples of time point of the intermittent aerating groove of 2 grooves.
[Fig. 6] shows the time chart of operating other examples of time point of the intermittent aerating groove of 3 grooves.
[Fig. 7] shows the time chart of operating other examples of time point of the intermittent aerating groove of 2 grooves.
[Fig. 8] shows the time chart of operating other examples of time point of the intermittent aerating groove of 3 grooves.
[Fig. 9] shows the time chart of operating other examples of time point of the intermittent aerating groove of 2 grooves.
[Figure 10] shows the time chart of operating other examples of time point of the intermittent aerating groove of 3 grooves.
[Figure 11] shows the time chart of operating time point one example of the intermittent aerating groove of 5 grooves.
[Figure 12] shows the schematic configuration diagram of conventional sewage-treatment plant one example.
[Figure 13] (a) is the time chart of operating time point one example of the intermittent aerating groove showing 1 groove, and (b) is display 1 groove
Intermittent aerating groove operating other examples of time point time chart.
Symbol description
1 sewage-treatment plant
2 sewage-treatment plants
10 intermittent aerating grooves
10a the first intermittent aerating groove
10b the second intermittent aerating groove
11 diffusers
12 agitating devices
13 ingress pipes
13a switch valve
13b switch valve
14 blower fans
15 fan controllers
16 processed water passages
16a switch valve
16b switch valve
17 passages Han sludge water
18 raw water pumps
20 membrance separation grooves
21 diffusers
22 membrane modules
23 ingress pipes
24 blower fans
25 infiltration aquaporins
26 membrane filtration pumps
27 return flow lines
27a switch valve
27b switch valve
28 circulating pumps
Detailed description of the invention
The present invention described further below.
[sewage-treatment plant]
Fig. 1 is the schematic configuration diagram of sewage-treatment plant one example showing the present invention.
Sewage-treatment plant 1 shown in Fig. 1, possesses the membrance separation groove 20 of intermittent aerating groove 10 and 1 groove having 2 grooves.With
Lower by the intermittent aerating groove 10 of 2 grooves be referred to as " the first intermittent aerating groove ", another be referred to as " the second intermittent aerating groove ".
Intermittent aerating groove 10, is for aeration being repeated and stopping aeration, by the effect of activated sludge, to trade effluent
Carry out a biological disposal upon Deng processed water, be made as the groove of biological treatment of water.
Intermittent aerating groove 10, possesses and has for carrying out the diffuser 11 of intermittent aerating in groove, and for carrying out in groove
The agitating device 12 of stirring.
Diffuser 11 is arranged on the near-bottom of intermittent aerating groove 10.
On diffuser 11, connect oriented diffuser 11 and supply the ingress pipe 13 of air, ingress pipe 13 is provided with blower fan 14.
On blower fan 14, connect and have fan controller 15.
As diffuser 11, as long as the air that blower fan 14 supplies can be spued upward, then it is not particularly limited, can
Enumerate such as, the single tube of perforate, membrane type diffuser.
On intermittent aerating groove 10, connect and have processed water passage 16 and containing sludge water passage 17.
Processed water passage 16, be for by processed water from store former tank (the omit diagram) supply of processed water between
Have a rest the passage of aeration tank 10.Raw water pump 18 it is provided with on processed water passage 16.
Containing sludge water passage 17, it is for being made up of extract out from intermittent aerating groove 10 biological treatment of water and activated sludge
The passage being transported to membrance separation groove 20 containing sludge water.
Membrance separation groove 20, is to carry out membrane filtration for transported by intermittent aerating groove 10 containing sludge water, carry out mud and
The groove of the membrance separation (solid-liquid separation) of infiltration water (process water).
Membrance separation groove 20, possesses and has for carrying out the diffuser 21 of aeration in groove and having the membrane module 22 of filter membrane.
Diffuser 21, the lower section of the membrane module 22 being arranged in membrance separation groove 20.
On diffuser 21, connect oriented diffuser 21 and supply the ingress pipe 23 of air, ingress pipe 23 is provided with blower fan 24.
As diffuser 21, as long as the air that blower fan 24 supplies can be spued upward, then it is not particularly limited,
Can enumerate such as, the single tube of perforate, membrane type diffuser.
Membrane module 22 is arranged in membrance separation groove 20.In membrane module 22, carry out film process containing sludge water by filter membrane.
As filter membrane, as long as having filter capacity, being then not particularly limited, can enumerate such as, hollow-fibre membrane, flat film,
Tubular film, monoblock type (Monolithic) film etc..Wherein, owing to volumetric filling ratio is high, preferably hollow-fibre membrane.
When using hollow-fibre membrane as filter membrane, as its material, can enumerate such as, cellulose, polyene, polysulfones, poly-
Vinylidene (PVDF), politef (PTFE) etc..Wherein, as the material of hollow-fibre membrane, based on drug resistance
Moral character, the angle strong to pH change reply property, preferably PVDF, PTFE.
When using monoblock type film as filter membrane, the film of ceramic is preferably used.
As the average pore size of the minute aperture being formed on filter membrane, the film being referred to as ultrafilter membrane is generally a 0.001～0.1 μm left side
The right side, the film being referred to as micro-filtration membrane is generally about 0.1～1 μm.Average pore size is preferably used within the above range in the present invention
Filter membrane.
On membrane module 22, connect and have the infiltration aquaporin 25 discharging infiltration water, this infiltration aquaporin 25 is provided with membrane filtration
Pump 26.Thus, it is possible to the infiltration water that will transmit through the filter membrane of membrane module 22 is discharged from membrance separation groove 20.
Additionally, on membrance separation groove 20, connect and have the return flow line 27 as reflux, this return flow line 27 is provided with
Circulating pump 28.Thus, the part in membrance separation groove 20 can be back to intermittent aerating groove from membrance separation groove 20 containing sludge water
10, between intermittent aerating groove 10 and membrance separation groove 20, carry out the transport containing sludge water and backflow (the most also will be transported and return
Stream is referred to as " circulation " in the lump).
Additionally, in Fig. 1, symbol 13a, 13b, 16a, 16b, 27a, 27b are switch valve respectively.
The sewage-treatment plant of the present invention is not limited to illustrated example.The sewage-treatment plant 1 of illustrated example possesses the interval having 2 grooves
Aeration tank 10, but intermittent aerating groove 10 can also have more than 3 grooves.
Additionally, in the sewage-treatment plant 1 of illustrated example, the intermittent aerating groove 10 of 2 grooves shares 1 blower fan 14, but each
Have a rest on aeration tank 10 and blower fan 14 can also be each set.
Additionally, in the sewage-treatment plant 1 of illustrated example, from the fortune containing sludge water of intermittent aerating groove 10 to membrance separation groove 20
Send as overflow, use circulating pump 28 from the backflow containing sludge water of membrance separation groove 20 to intermittent aerating groove 10 but it also may phase
Instead.That is, the backflow containing sludge water from membrance separation groove 20 to intermittent aerating groove 10 is overflow, from intermittent aerating groove 10 to
The transport containing sludge water of membrance separation groove 20 uses circulating pump 28.
Additionally, by biological treatment, the pH of the activated sludge in intermittent aerating groove 10 changes sometimes.Accordingly it is also possible to
Intermittent aerating groove 10 arranges pH adjusting apparatus, is used for adding alkali or acid, the pH of activated sludge is adjusted to suitable raw
The near neutral that thing processes.
[sewage water treatment method]
＜ the first embodiment ＞
Then, for the first embodiment example of the sewage water treatment method of the present invention, it is that nitrogenous sewage is with processed water
Example, illustrates with reference to the time chart shown in Fig. 1 and Fig. 2.
Additionally, the sewage water treatment method of following description is intermittent aerating groove 10 is the situation of 2 grooves, but intermittent aerating groove 10 is also
Can be more than 3 grooves.
The sewage water treatment method of first embodiment of the present invention, is to process sewage by intermittent aerating membrane separation activated sludge process
Method, have: processed water is imported intermittent aerating groove 10, be repeated aeration and stop aeration, pass through activated sludge
Carry out the intermittent aerating operation carried out a biological disposal upon；By being made up of biological treatment of water and activated sludge in intermittent aerating groove 10
It is transported to membrance separation groove 20 containing sludge water, carries out the membrane filtration operation of membrane filtration；Make the part in membrance separation groove 20 containing dirt
Muddy water is back to the reflow process of intermittent aerating groove 10 from membrance separation groove 20.
The processed water of the process object of the present invention, be the content of nitrogen and phosphorous such as discharged from herding, food, chemical plant etc. relatively
High sewage.
Preferably processed water is had previously been stored in former tank (omitting diagram), absorbs amount and the variation of matter of processed water,
Again after screening removes thick impurity, import intermittent aerating groove 10.
It is between 6,000～20,000mg/L that the sludge concentration of each intermittent aerating groove 10 is the most suitably set in MLSS.MLSS
Less than 6, if 000mg/L, become the reason that biological treatment efficiency declines and film blocks sometimes.
If MLSS is high concentration, viewpoint based on biological treatment efficiency is preferable, but more than 20, if 000mg/L,
Sewage sludge viscosity is too high, becomes mud sometimes and sticks together the reason on the filter membrane of membrane module 22.
In time chart shown in Fig. 2, first, stop the aeration of the first intermittent aerating groove, import processed water and (stop exposing
Gas operation).On the other hand, the second intermittent aerating groove does not flows into processed water and start aeration (aeration operation).It addition,
While making to circulate between the second intermittent aerating groove and membrance separation groove containing sludge water, carry out containing sludge water in membrance separation groove
Membrane filtration.
After have passed through the stipulated time, stop the aeration of the second intermittent aerating groove, import processed water (stopping aeration operation).
On the other hand, the first intermittent aerating groove does not flows into processed water and start aeration (aeration operation).It addition, make containing mud
While water circulates between the first intermittent aerating groove and membrance separation groove, in membrance separation groove, carry out membrane filtration to containing sludge water.
So, often through the stipulated time, in the first intermittent aerating groove and the second intermittent aerating groove, aeration and stopping are repeated
Aeration.
The process of detailed description below intermittent aerating, membrane filtration and circulation.
First, making switch valve 13a is "Off", stops the aeration of the first intermittent aerating groove 10a, meanwhile, makes switch valve 13b
For "ON", make blower fan 14 work, spue air from diffuser 11, start the aeration of the second intermittent aerating groove 10b.Additionally,
Make switch valve 16a be "ON", switch valve 16b be "Off", make raw water pump 18 work, from former tank (omitting diagram) only to
First intermittent aerating groove 10a supply processed water (former water inflow).Additionally, make blower fan 24 and membrane filtration pump 26 work,
By overflow, make to be transported to being carried out containing sludge water of membrance separation groove 20 by membrane module 22 from the second intermittent aerating groove 10b
Membrane filtration, discharges infiltration water from membrance separation groove 20.Meanwhile, make switch valve 27a be "Off", switch valve 27b be "ON", make
Circulating pump 28 works, and makes the part in membrance separation groove 20 be back to the second intermittent aerating groove containing sludge water from membrance separation groove 20
10b, makes to circulate (circulation containing sludge water) containing sludge water between the second intermittent aerating groove 10b and membrance separation groove 20.
It is preferably processed water to supply the most at short notice to the first intermittent aerating groove 10a after stopping aeration operation starts.This
Being because, the service time of processed water is the shortest, stops the time of the denitrification reaction of generation in aeration operation the longest, Ke Yigeng
Remove nitrogen efficiently.It is therefore preferable that the processed water at ormal weight set in advance is supplied to the first intermittent aerating groove 10a
After, close raw water pump 18, stop the supply of processed water.
In stopping aeration operation in first intermittent aerating groove 10a, using the Organic substance contained by the processed water in lead-in groove as
Electron donor, is reduced to nitrogen (denitrification reaction) by the microorganism contained by activated sludge by nitric acid or nitrous acid.By this
Stop the denitrification reaction that caused of aeration, Organic substance in processed water and nitric acid and the lowering of concentration of nitrous acid.
An organic part is broken down into water and carbon dioxide.Additionally, an organic part is used for constituting activated sludge
The propagation of microorganism, eventually become excess sludge and be discharged.
Can precipitate owing to stopping activated sludge in aeration operation, preferably the most dirty by the activity in agitating device 12 agitator tank
Mud.Stirred additionally, substitute by agitating device 12, it is also possible to by carrying out the exposure of very short time in stopping aeration operation
Gas and stirring active mud.But, based on can be with the angle of anaerobic state in well maintained groove, preferably by agitating device 12
Stirring active mud.
Additionally, the pH that denitrification reaction makes activated sludge sometimes changes.In such cases, preferably dress is adjusted by pH
Put (omitting diagram) and add alkali or acid, the pH of activated sludge is adjusted to the near neutral that appropriate biological processes.
On the other hand, in the aeration operation in the second intermittent aerating groove 10b, aeration operation starts being processed in front lead-in groove
Organic substance contained by water and nitrogen component, by the oxygen in the air that aeration is supplied oxidized (nitration reaction).
Nitrogen component is with organic nitrogens such as protein, aminoacid, carbamide；The mode of the inorganic nitrogens such as ammonia, nitric acid, nitrous acid and comprise
In processed water.The organic nitrogen of protein etc. becomes ammonia by biological hydrolysis, Oxidation.Pass through activated sludge
The microorganisms such as contained ammonia oxidizing bacteria, nitrite-oxidizing bacteria, ammonia is further oxided as nitric acid and nitrous acid.Therefore,
Ammonia in activated sludge and organic concentration, along with aeration activity time through and step-down.
In aeration operation, by nitration reaction, the pH of activated sludge changes sometimes.In such cases, pH is preferably passed through
Adjusting apparatus (omitting diagram) adds alkali or acid, and the pH of activated sludge adjusts the near neutral processed to appropriate biological.
During aeration operation, make to circulate between the second intermittent aerating groove 10b and membrance separation groove 20 containing sludge water.From second
Intermittent aerating groove 10b be transported to membrance separation groove 20 containing sludge water, carry out film by the membrane module 22 of membrance separation groove 20
Filter.Pass through the infiltration water of the filter membrane of membrane module 22, discharged from membrance separation groove 20 by infiltration aquaporin 25.This
Outward, the part in membrance separation groove 20 is back to the second intermittent aerating groove 10b containing sludge water.
Circulate in the flow containing sludge water between intermittent aerating groove 10 and membrance separation groove 20, preferably with respect to by membrane filtration
Amount containing sludge water is about 2～5 times.If 2 times, the activated sludge in membrance separation groove 20 occurs excessively concentrating
Gesture, if 5 times, circulation required drive is excessive, operating cost increase tendency occurs.
After the stipulated time, making switch valve 13b is "Off", stops the aeration of the second intermittent aerating groove 10b, makes meanwhile
Switch valve 13a is "ON", spues air from diffuser 11, starts the aeration of the first intermittent aerating groove 10a.Additionally, make out
Close valve 16a be "Off", switch valve 16b be "ON", make raw water pump 18 work, from former tank (omitting diagram) only to second
Intermittent aerating groove 10b supply processed water (former water inflow).Additionally, pass through overflow so that from the first intermittent aerating groove 10a
Be transported to membrance separation groove 20 carries out membrane filtration containing sludge water by membrane module 22, discharges infiltration water from membrance separation groove 20.
Meanwhile, make switch valve 27a be "ON", switch valve 27b be "Off" so that the part in membrance separation groove 20 containing sludge water from film
Separating tank 20 is back to the first intermittent aerating groove 10a so that containing sludge water at the first intermittent aerating groove 10a and membrance separation groove 20
Between circulate (circulation containing sludge water).
It is preferably processed water to supply the most at short notice to the second intermittent aerating groove 10b after stopping aeration operation starts.Cause
This, after preferably the processed water at ormal weight set in advance is supplied to the second intermittent aerating groove 10b, close raw water pump 18,
Stop the supply of processed water.
Additionally, in sewage disposal, blower fan 14,24, membrane filtration pump 26 and circulating pump 28 keep work.
In aeration operation in first intermittent aerating groove 10a, carry out is nitration reaction, in the second intermittent aerating groove 10b
Stopping in aeration operation, carry out is denitrification reaction.
Additionally, during aeration operation, make to circulate between the first intermittent aerating groove 10a and membrance separation groove 20 containing sludge water.From
First intermittent aerating groove 10a be transported to membrance separation groove 20 containing sludge water, carried out by the membrane module 22 of membrance separation groove 20
Membrane filtration.Pass through the infiltration water of the filter membrane of membrane module 22, by infiltration aquaporin 25, discharged from membrance separation groove 20.
Additionally, the part in membrance separation groove 20 is back to the first intermittent aerating groove 10a containing sludge water.
So, often through the stipulated time, the on off state of switching valve 13a, 13b, control each intermittent aerating groove 10
Operating.Thus, the operating time point of the first intermittent aerating groove 10a and the second intermittent aerating groove 10b is different.Time shown in Fig. 2
In chart, during the first intermittent aerating groove 10a carries out aeration, the second intermittent aerating groove 10b stops aeration, between second
Have a rest in aeration tank 10b during carrying out aeration, the first intermittent aerating groove 10a stops aeration.Therefore, sewage disposal carries out the phase
Between, the intermittent aerating groove 10 of 2 grooves is alternately aeration state, and have any one intermittent aerating groove 10 is aeration state always.
Additionally, often through stipulated time, the on off state of switching valve 27a, 27b, the switching circulating path containing sludge water.
Circulating and the second intermittent aerating containing sludge water between the i.e., alternately first intermittent aerating groove 10a and membrance separation groove 20
Circulating containing sludge water between groove 10b and membrance separation groove 20.Additionally, due to the circulation containing sludge water is under aeration state
Intermittent aerating groove 10 and membrance separation groove 20 between carry out, therefore stop in the intermittent aerating groove 10 under aeration state not
Have refluxing containing sludge water of high DO.Therefore, stop that the intermittent aerating groove 10 under aeration state maintains denitrogenation institute required
Anaerobic state, therefore can remove nitrogen efficiently.
In the sewage water treatment method of the first embodiment, the quantity of intermittent aerating groove is set to the exposure in n, intermittent aerating operation
The gas time is set to t1, stops aeration time and be set to the greatest common divisor of t2, t1 and t2 when being set to a, preferably meets following formula (1).
N=t1/a+t2/a ... (1)
Additionally, the unit of t1 and t2 is " hour ", and during non-integer, " hour " is scaled " minute ", for asking after integer
Obtain the greatest common divisor of t1 and t2, substitute into above formula (1).
As it has been described above, the ammonia in activated sludge and organic concentration, along with aeration activity time through and step-down.Therefore,
From intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic concentration also with aeration activity time
Through and step-down.
In order to efficiently carry out the water stabilization containing sludge water in membrane filtration, preferably membrance separation groove.Containing in membrance separation groove to be made
The water stabilization of sludge water, can make to be carried out between each intermittent aerating groove and membrance separation groove circulates containing sludge water, from respectively
Intermittent aerating groove is transported to the most certain containing the ammonia in sludge water and organic overall density of membrance separation groove.Intermittent aerating
Aeration time (t1) and stopping aeration time (t2) in the quantity (n) of groove, intermittent aerating operation meet above formula (1)
If, from each intermittent aerating groove be transported to membrance separation groove can be substantially containing the ammonia sludge water and organic overall density
Necessarily, the water quality containing sludge water in membrance separation groove is easily stable.
Illustrate referring to time chart shown in Fig. 2～9.
Shown in Fig. 2, time chart is shown that, intermittent aerating groove be 2 grooves (n=2), the quantity (n) of intermittent aerating groove,
Aeration time (t1) in intermittent aerating operation and stop each intermittent aerating groove when aeration time (t2) meets above formula (1)
Operating time point.
Additionally, intermittent aerating groove is the aeration in 3 grooves (n=3), the quantity (n) of intermittent aerating groove, intermittent aerating operation
Time (t1) and stop the operating time point of each intermittent aerating groove when aeration time (t2) meets above formula (1), for example, scheme
Time chart shown in 3.
Additionally, intermittent aerating groove is the aeration in 4 grooves (n=4), the quantity (n) of intermittent aerating groove, intermittent aerating operation
Time (t1) and stop the operating time point of each intermittent aerating groove when aeration time (t2) meets above formula (1), for example, scheme
Time chart shown in 4.
Aeration time (t1) and stopping aeration time (t2) in the quantity (n) of intermittent aerating groove, intermittent aerating operation are full
If foot above formula (1), when intermittent aerating groove is 2 groove, as in figure 2 it is shown, the first intermittent aerating groove is during aeration state,
Second intermittent aerating groove is for stopping aeration state.During additionally, intermittent aerating groove is more than 3 grooves, such as Fig. 3, shown in 4,
It is easily controlled the operating of each intermittent aerating groove, during arbitrary intermittent aerating groove is aeration state, remaining intermittent aerating groove
In any 1 groove be aeration state (that is, sewage disposal carry out period, the intermittent aerating groove of 1 groove for stop aeration state).
Circulation time started containing sludge water of therefore, being carried out between the intermittent aerating groove under aeration state and membrance separation groove,
And when the difference between the time started of the aeration operation of the intermittent aerating groove under this aeration state is for " delaying the time ", so that
Each intermittent aerating groove delays time consistency.Such as Fig. 3, in 4, in the first intermittent aerating groove containing sludge water circulation
Start, be in the case of the aeration in this first intermittent aerating groove started after the α time, remaining intermittent aerating groove
The circulation containing sludge water in (second, third, the 4th intermittent aerating groove) starts, and is also the exposure in this intermittent aerating groove
Gas started after the α time.
In each intermittent aerating groove delay time consistency if, no matter which intermittent aerating groove to be transported to film containing sludge water from and divided
From groove, easily certain (water quality containing sludge water is the most identical) containing the ammonia in sludge water and organic overall density, film divides
The water quality containing sludge water in groove is easily stable.
Additionally, in time chart shown in Fig. 2, the time of delaying is for " 0 " hour.
In time chart shown in Fig. 3, delaying time α is " t1 × 1/2 " hour, in time chart shown in Fig. 4, delays time α
For " t1 × 2/3 " hour.In Fig. 3, time chart shown in 4, in all of intermittent aerating groove, the intermittent aerating under aeration state
The circulation containing sludge water between groove and membrance separation groove, is the second half section of the aeration operation of intermittent aerating groove under aeration state
Carry out.Fig. 3, in 4, although the circulation containing sludge water can also be carried out in the first half section of the aeration operation of intermittent aerating groove,
But as it has been described above, ammonia and organic concentration in activated sludge can be passed through and step-down along with the time of aeration operation, therefore
Comparing to the first half section of aeration operation, the concentration of second half section is low.Therefore, when particularly intermittent aerating groove is more than 3 grooves, excellent
The choosing circulation time started containing sludge water is later than the aeration time started of intermittent aerating groove.
Additionally, the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation and stopping aeration time (t2)
If meeting above formula (1), readily satisfy all following conditions (i)～(iii).
Condition (i): during sewage disposal, the quantity of the intermittent aerating groove under aeration state is certain.
Condition (ii): during sewage disposal, containing sludge water any one intermittent aerating groove and membrance separation under aeration state
Circulate between groove.
Condition (iii): in each intermittent aerating groove, operating condition is identical.Here, operating condition refers to aeration time
(t1), stop aeration time (t2), time point, circulation time containing sludge water that former water flows into, delay time α etc..
If meeting condition (i), sewage can be processed by starting small-sized pressure fan always, therefore can control initial investment
Etc. expense.
If meeting condition (ii), during sewage disposal, can carry out membrane filtration operation, therefore the membrane filtration time becomes always
Long.In addition it is also possible to reduction permeation flux.Therefore, it can while alleviating filter membrane load, it is achieved transport steadily in the long term
Turn.
If meeting condition (iii), the water quality that easy holding processes water is certain, therefore can reduce the place of sewage-treatment plant
Reason ability and scale.
On the other hand, during intermittent aerating groove is 2 grooves (n=2), the quantity (n) of intermittent aerating groove, intermittent aerating operation
When aeration time (t1) and stopping aeration time (t2) are unsatisfactory for above formula (1), the aeration of each intermittent aerating groove and stopping expose
Time chart as shown in Figure 5 as a example by the circulation of gas.
In sewage disposal, it is desirable to if stopper film does not filters, need to start membrane filtration pump and circulating pump, therefore containing mud always
The circulation of water is carried out between certain intermittent aerating groove and membrance separation groove always.Therefore, intermittent aerating groove quantity (n),
Aeration time (t1) in intermittent aerating operation and stop aeration time (t2) when being unsatisfactory for above formula (1), as it is shown in figure 5,
Time of delaying α in each intermittent aerating groove becomes different.In time chart shown in Fig. 5, the first intermittent aerating groove and membrance separation
The circulation containing sludge water between groove starts, and the aeration operation being an immediately proceeding at the first intermittent aerating groove starts rear (that is, when delaying
Between be " 0 " hour), on the other hand, the circulation containing sludge water between the second intermittent aerating groove and membrance separation groove starts, be
Aeration operation midway (time α is delayed in generation) of the second intermittent aerating groove.Therefore, it is transported to from the first intermittent aerating groove
Membrance separation groove containing the ammonia in sludge water and organic overall density, higher than being transported to membrance separation from the second intermittent aerating groove
Groove containing the ammonia in sludge water and organic overall density, the water quality containing sludge water in membrance separation groove is difficult to stable.
Intermittent aerating groove is the most identical when being 3 grooves (n=3), the exposure in the quantity (n) of intermittent aerating groove, intermittent aerating operation
If gas time (t1) and stopping aeration time (t2) are unsatisfactory for above formula (1), such as shown in Fig. 6, each intermittent aerating groove
In time of delaying α become different.Therefore, from each intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and
Organic overall density is different, and the water quality containing sludge water in membrance separation groove is difficult to stable.
Additionally, shown in such as Fig. 7～9, even if time of the delaying α in each intermittent aerating groove is identical, the quantity of intermittent aerating groove
Aeration time (t1) in (n), intermittent aerating operation and stop aeration time (t2) when being unsatisfactory for above formula (1), meeting
It is unsatisfactory at least 1 in above-mentioned condition (i)～(iii).
In time chart shown in Fig. 7, intermittent aerating groove is 2 grooves (n=2), and time of the delaying α of each intermittent aerating groove is " t1 × 1/4 "
Hour.But, owing to creating the first intermittent aerating groove and the second intermittent aerating groove simultaneously for the time period of aeration state, because of
The quantity of the intermittent aerating groove under this aeration state might not, be unsatisfactory for condition (i).Such as shown in Fig. 2 in the case of, for
Meet condition (i), it is possible to use there is the pressure fan only needing that the intermittent aerating groove of 1 groove carries out the disposal ability of aeration,
And in the case of Fig. 7, it is necessary to use the pressure fan with the disposal ability that intermittent aerating groove to 2 grooves simultaneously carries out aeration,
It is thus desirable to expend the expenses such as initial investment.
In time chart shown in Fig. 8, intermittent aerating groove is 3 grooves (n=3), and time of the delaying α of each intermittent aerating groove is
" t1 × 1/2 " hour.But, now the quantity of the intermittent aerating groove under aeration state the most not necessarily, is therefore unsatisfactory for condition (i).
In addition, owing to the time period do not circulated containing sludge water can be produced, condition (ii) the most also it is unsatisfactory for.Containing sludge water not
Cannot be carried out during circulation processing the attraction of water, therefore membrane filtration the limited time, permeation flux becomes big, and filter membrane hinders sometimes
Plug.
In time chart shown in Fig. 9, intermittent aerating groove is 2 grooves (n=2), and time of the delaying α of each intermittent aerating groove is " 0 "
Hour.Although additionally, now meet condition (i), (ii), but the first intermittent aerating groove and the exposure of the second intermittent aerating groove
Gas time (t1) and stopping aeration time (t2) are different, are unsatisfactory for condition (iii).Therefore, the water quality processing water is difficult to protect
Hold certain.
Additionally, in time chart shown in Fig. 2～9, control the operating of each intermittent aerating groove, make the operating of all intermittent aerating grooves
Time point is different, when intermittent aerating groove is more than 3 grooves, carries out period in sewage disposal, as long as there being the intermittent aerating of more than 1 groove
Groove is aeration state, and the operating time point of the most multiple intermittent aerating grooves can also be identical.But, it is considered to if blower fan disposal ability,
Preferably control the operating of each intermittent aerating groove so that the operating time point of all intermittent aerating grooves is different.
Additionally, it is contemplated that during the disposal ability of blower fan, carry out period in sewage disposal, preferably control the operating of each intermittent aerating groove,
Make the intermittent aerating groove of more than 1 groove for stopping aeration state, more preferably control the operating of each intermittent aerating groove so that 1 groove
Intermittent aerating groove for stop aeration state.
Additionally, in time chart shown in Fig. 2～8, setting is that the aeration time (t1) in intermittent aerating operation exposes with stopping
The situation that the gas time (t2) is identical or longer, even if stop aeration time (t2) be longer than aeration time (t1), meet on
If formula (1), the most easily make the water stabilization containing sludge water in membrance separation groove.
Intermittent aerating groove is the aeration time (t1) in 3 grooves (n=3), the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stopping aeration time (t2) meets above formula (1), and during t1 ＜ t2, the aeration of each intermittent aerating groove and stopping aeration
Circulate for example, time chart shown in Figure 10.
Additionally, intermittent aerating groove is the aeration in 5 grooves (n=5), the quantity (n) of intermittent aerating groove, intermittent aerating operation
Time (t1) and stop aeration time (t2) and meet above formula (1), and during t1 ＜ t2, the aeration of each intermittent aerating groove with
Stop the circulation for example, time chart shown in Figure 11 of aeration.
Such as Figure 10, shown in 11, aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation and stopping
Only aeration time (t2) meets above formula (1), and during t1 ＜ t2, the most easily makes to delay the time in each intermittent aerating groove
Unanimously.Therefore, no matter which intermittent aerating groove to be transported to membrance separation groove containing sludge water from, containing the ammonia in sludge water and organic
The overall density of thing easily becomes certain, and the water quality containing sludge water in membrance separation groove is easily stable.
In time chart shown in Figure 10, the time of delaying is for " 0 " hour.In time chart shown in Figure 11, the time of delaying is for " t1 × 1/2 "
Hour.
＜ the second embodiment ＞
The sewage water treatment method of second embodiment of the present invention, identical with the first embodiment, it is to be divided by intermittent aerating film
From the method for Wastewater Treated by Activated Sludge Process sewage, have: processed water is imported intermittent aerating groove 10, aeration is repeated and stops
Only aeration, carries out the intermittent aerating operation carried out a biological disposal upon by activated sludge；By in intermittent aerating groove 10 by carrying out a biological disposal upon
What water and activated sludge were constituted is transported to membrance separation groove 20 containing sludge water, carries out the membrane filtration operation of membrane filtration；Make membrance separation
Part in groove 20 is back to the reflow process of intermittent aerating groove 10 containing sludge water from membrance separation groove 20.
In the sewage water treatment method of the second embodiment, the quantity of intermittent aerating groove is set to the exposure in n, intermittent aerating operation
The gas time is set to t1, stops aeration time when being set to t2, preferably meets following formula (2).
T1/t2=n-1 ... (2)
As it has been described above, in order to efficiently carry out the water stabilization containing sludge water in membrane filtration, preferably membrance separation groove.In order to make film
The water stabilization containing sludge water in separating tank, can carry out between each intermittent aerating groove and membrance separation groove containing sludge water
In circulation so that be transported to the big containing the ammonia sludge water and organic overall density of membrance separation groove from each intermittent aerating groove
Cause certain.Aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation and stopping aeration time (t2)
When meeting above formula (2), from each intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic entirety
Concentration can be substantially certain, and the water quality containing sludge water in membrance separation groove is easily stable.
Intermittent aerating groove is 2 grooves (n=2), the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stop aeration time (t2) when meeting above formula (2), the operating time point of each intermittent aerating groove for example, time diagram shown in Fig. 2
Table.
Intermittent aerating groove is 3 grooves (n=3), the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stop aeration time (t2) when meeting above formula (2), the operating time point of each intermittent aerating groove for example, time diagram shown in Fig. 3
Table.
Intermittent aerating groove is 4 grooves (n=4), the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stop aeration time (t2) when meeting above formula (2), the operating time point of each intermittent aerating groove for example, time diagram shown in Fig. 4
Table.
On the other hand, intermittent aerating groove is 2 grooves (n=2), in the quantity (n) of intermittent aerating groove, intermittent aerating operation
When aeration time (t1) and stopping aeration time (t2) are unsatisfactory for above formula (2), the aeration of each intermittent aerating groove and stopping expose
The circulation of gas for example, time chart shown in Fig. 5.
Intermittent aerating groove is 3 grooves (n=3), the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stop aeration time (t2) when being unsatisfactory for above formula (2), the aeration of each intermittent aerating groove with stop the circulation of aeration for example,
Time chart shown in Fig. 6.
Additionally, time chart shown in Fig. 2～6 and the first embodiment are identical, therefore the description thereof will be omitted.
The aeration time (t1) that what above formula (2) set is in intermittent aerating operation is with to stop aeration time (t2) identical or relatively
Long situation, even in stop aeration time (t2) identical with aeration time (t1) or longer in the case of, under meeting
If formula (3), the most easily make the water stabilization containing sludge water in membrance separation groove.
T2/t1=n-1 ... (3)
Intermittent aerating groove is 3 grooves (n=3), the aeration time (t1) in the quantity (n) of intermittent aerating groove, intermittent aerating operation
And stopping aeration time (t2) when meeting above formula (3), the circulation of the aeration of each intermittent aerating groove and stopping aeration for example, being schemed
Time chart shown in 10.
Additionally, time chart shown in Figure 10 and the first embodiment are identical, therefore the description thereof will be omitted.
In the sewage water treatment method of the second embodiment, when intermittent aerating groove is more than 3 grooves, as long as sewage disposal carries out period
The intermittent aerating groove having more than 1 groove is aeration state, then the operating time point of multiple intermittent aerating grooves can also be identical.But,
If considering blower fan disposal ability, preferably control the operating of each intermittent aerating groove so that the operating time point of all intermittent aerating grooves
Different.
Additionally, it is contemplated that during the disposal ability of blower fan, preferably carry out period in sewage disposal, control the operating of each intermittent aerating groove,
Make the intermittent aerating groove of more than 1 groove for stopping aeration state, more preferably control the operating of each intermittent aerating groove so that 1 groove
Intermittent aerating groove for stop aeration state.
" action effect "
In the sewage water treatment method of present invention mentioned above and sewage-treatment plant, use multiple intermittent aerating groove, control each
The operating of intermittent aerating groove so that carrying out period in sewage disposal, the intermittent aerating groove having more than 1 groove is aeration state.Remove
Beyond this, between intermittent aerating groove and the membrance separation groove under aeration state, carry out the circulation containing sludge water.Therefore, sewage
Process carries out period, even if implementing membrane filtration continuously, stops there will not be containing of high DO in the intermittent aerating groove of aeration state
Sludge water refluxes.Therefore, it can in the intermittent aerating groove stopping aeration state, maintain anaerobic state necessary to denitrogenation or remove
Anaerobic state necessary to dephosphorization, therefore can carry out stable nitrogen and process or phosphorus process.In addition, due to sewage disposal
Can not filter and implement continuously by stopper film during carrying out, therefore can improve treatment effeciency (the process water of every 1 day of sewage
Amount).Additionally, if the present invention, the treatment effeciency of sewage is high, therefore without excessively increasing the membrane area of filter membrane.Additionally,
Flux (permeation flux) can also be reduced.
Additionally, sewage disposal carries out period, intermittent aerating groove more than 1 groove, for stopping aeration state, compares to exist
All intermittent aerating grooves are the situation of aeration state time point, as the blower fan used when intermittent aerating groove is carried out aeration, and can
To use the blower fan that disposal ability is less.This is because, carry out period in sewage disposal, there is all intermittent aerating grooves for exposing
If the time point of gaseity, it is necessary to use the blower fan with the disposal ability that all intermittent aerating grooves can be carried out aeration.
Aeration time (t1) and stopping aeration time (t2) in the quantity (n) of intermittent aerating groove, intermittent aerating operation are full
If any one in foot above formula (1)～(3), carry out period in sewage disposal, be easily controlled each intermittent aerating groove
Operating so that intermittent aerating groove more than 1 groove is for stopping aeration state.Such as, the intermittent aerating groove using 2 grooves replace into
If row aeration, carrying out period in sewage disposal, the intermittent aerating groove under aeration state is always 1 groove.Therefore, though
The quantity of aeration tank of having a rest increases to 2 grooves (doubling) from 1 groove, only exposes the intermittent aerating groove of 1 groove as long as using to have
The blower fan of the disposal ability of gas, relatively inexpensive.Particularly, the quantity (n) of intermittent aerating groove, intermittent aerating operation
In aeration time (t1) and if stopping aeration time (t2) meeting above formula (1), readily satisfy whole above-mentioned condition (i)
～(iii).Therefore, be also readily obtained can suppress the expenses such as initial investment, alleviate realize while filter membrane load long-term steady
Fixed operating, process the water quality of water and easily keep the effect such as certain.
[embodiment]
Describe the present invention by the following examples in detail, but the present invention is not limited to the following stated.
[embodiment 1]
Use the sewage-treatment plant 1 shown in Fig. 1, be carried out as follows sewage disposal.
As sewage, use the nitric wastewater discharged from animal house of raising pigs.
As the first intermittent aerating groove 10a and the second intermittent aerating groove 10b, use volume 10m3Intermittent aerating groove.Additionally,
As membrane module 22, use hollow fiber film assembly.As hollow-fibre membrane, use membrane area 20m2Hollow-fibre membrane.
In each intermittent aerating groove 10, aeration time (t1) is 4 hours, and stopping aeration time (t2) is 4 hours, such as figure
Time chart shown in 2 (that is, carries out in the first intermittent aerating groove 10a the period of aeration, stops in the second intermittent aerating groove 10b
Only aeration), control the operating of each intermittent aerating groove 10, at the first intermittent aerating groove 10a and the second intermittent aerating groove 10b
In alternately membrane filtration (circulation containing sludge water).
Additionally, the former water input amount for every 1 day of intermittent aerating groove 10 entirety is 10m3。
Additionally, the aeration of 1 time and stop aeration be 1 circulation if, above-mentioned under the conditions of, the cycle-index of 1 day is 3 times,
The former water input amount of each intermittent aerating groove in 1 circulation is 1.67m3(=10m33 ÷ 2 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 4, t1/a+t2/a=2, meet above formula (1).
It addition, t1/t2=1, also meet above formula (2).
In embodiment 1, the membrane filtration time of every 1 day is 24 hours, can implement membrane filtration continuously.Additionally, due to stop
Only the intermittent aerating groove under aeration state does not reflux containing sludge water, can in therefore stopping the intermittent aerating groove under aeration state
To maintain anaerobic state, stable nitrogen can be carried out and process.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 10m to be obtained3The average film filtration flux processing water of/d
For 0.5m/d (=10m3/d÷20m2), can persistently carry out stable membrane filtration.
Additionally, in embodiment 1, the first intermittent aerating groove and the second intermittent aerating groove will not produce the time period of aeration simultaneously (i.e.,
Meet above-mentioned condition (i)).Therefore, although intermittent aerating groove is 2 grooves, but as long as having and only the interval of 1 groove can being exposed
Air drain carries out the blower fan of the disposal ability of aeration, all intermittent aerating grooves can be carried out Air Exposure, initial stage cost cutting.
Additionally, in embodiment 1, also meet above-mentioned condition (ii), (iii).
[embodiment 2]
Intermittent aerating groove is 3 grooves, and the volumetric change of each intermittent aerating groove is 6.7m3, and in each intermittent aerating groove, aeration
Time (t1) is 4 hours, and stopping aeration time (t2) is 2 hours, and time chart as shown in Figure 3 controls each interval
The operating of aeration tank, and set the time point (delaying time α) that the circulation containing sludge water starts, in addition, with enforcement
Example 1 similarly carries out sewage disposal.
Additionally, in embodiment 2, the cycle-index of 1 day is 4 times, the former water of each intermittent aerating groove in 1 circulation puts into
Amount is 0.83m3(=10m34 ÷ 3 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 2, t1/a+t2/a=3, meet above formula (1).
It addition, t1/t2=2, also meet above formula (2).
In embodiment 2, the membrane filtration time of every 1 day is 24 hours, can implement membrane filtration continuously.Additionally, due to stop
Only the intermittent aerating groove under aeration state does not reflux containing sludge water, can in therefore stopping the intermittent aerating groove under aeration state
To maintain anaerobic state, stable nitrogen can be carried out and process.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 10m to be obtained3The average film filtration flux processing water of/d
For 0.5m/d (=10m3/d÷20m2), can persistently carry out stable membrane filtration.
Additionally, in embodiment 2, although the intermittent aerating groove of 2 grooves has the time period of aeration simultaneously, but will not have all of
The time period of aeration tank of having a rest aeration simultaneously, the quantity of the intermittent aerating groove under aeration state is certain (that is, on meeting all the time
State condition (i)).Therefore, although intermittent aerating groove is 3 grooves, only the intermittent aerating groove of 2 grooves can be entered but as long as having
All intermittent aerating grooves can be carried out Air Exposure, initial stage cost cutting by the blower fan of the disposal ability of row aeration.
Additionally, in embodiment 2, also meet above-mentioned condition (ii), (iii).
[embodiment 3]
In each intermittent aerating groove, aeration time (t1) is 4 hours, and stopping aeration time (t2) is 2 hours, such as Fig. 5
Shown time chart, controls the operating of each intermittent aerating groove, and sets the time point circulating beginning containing sludge water (when delaying
Between α), in addition, carry out sewage disposal similarly to Example 1.
Additionally, in embodiment 3, the cycle-index of 1 day is 4 times, the former water of each intermittent aerating groove in 1 circulation puts into
Amount is 1.25m3(=10m34 ÷ 2 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 2, t1/a+t2/a=3, it is unsatisfactory for above formula (1).
It addition, t1/t2=2, also it is unsatisfactory for above formula (2).
In embodiment 3, the membrane filtration time of every 1 day is 24 hours, can implement membrane filtration continuously.Additionally, due to stop
Only the intermittent aerating groove under aeration state does not reflux containing sludge water, can in therefore stopping the intermittent aerating groove under aeration state
To maintain anaerobic state, stable nitrogen can be carried out and process.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 10m to be obtained3The average film filtering traffic processing water of/d
For 0.5m/d (=10m3/d÷20m2), can persistently carry out stable membrane filtration.
But, as it is shown in figure 5, in embodiment 3, time of the delaying α in each intermittent aerating groove is different.Concrete, first
The beginning containing sludge water circulation between intermittent aerating groove and membrance separation groove, is to start in the aeration operation of the first intermittent aerating groove
After carry out immediately, between the second intermittent aerating groove and membrance separation groove containing sludge water circulation beginning, be at the second intermittent aerating
The aeration operation midway of groove.Therefore, from the first intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic
The overall density of thing, higher than from the second intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic whole
Bulk concentration, compares to embodiment 1,2, and the water quality containing sludge water in membrance separation groove is difficult to stable.
Additionally, in embodiment 3, create the time period of the first intermittent aerating groove and the second intermittent aerating groove aeration simultaneously (i.e.,
It is unsatisfactory for above-mentioned condition (i)).Therefore, although identical with the quantity of the intermittent aerating groove of embodiment 1, but in embodiment 3
Must have the blower fan of the disposal ability that only the intermittent aerating groove of 2 grooves can be carried out aeration, compare to embodiment 1, initial stage
Cost increases.
Additionally, in embodiment 3, be also unsatisfactory for above-mentioned condition (iii).
[embodiment 4]
Intermittent aerating groove is 3 grooves, and the volumetric change of each intermittent aerating groove is 6.7m3, and in each intermittent aerating groove, aeration
Time (t1) is 6 hours, and stopping aeration time (t2) is 2 hours, and time chart as shown in Figure 6 controls each interval
The operating of aeration tank, and set the beginning time point (delaying time α) containing sludge water circulation, in addition, with embodiment
1 similarly carries out sewage disposal.
Additionally, in embodiment 4, the cycle-index of 1 day is 3 times, the former water of each intermittent aerating groove in 1 circulation puts into
Amount is 1.11m3(=10m33 ÷ 3 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 2, t1/a+t2/a=4, it is unsatisfactory for above formula (1).
It addition, t1/t2=3, also it is unsatisfactory for above formula (2).
In embodiment 4, the membrane filtration time of every 1 day is 24 hours, can implement membrane filtration continuously.Additionally, due to stop
Only the intermittent aerating groove under aeration state does not reflux containing sludge water, can in therefore stopping the intermittent aerating groove under aeration state
To maintain anaerobic state, stable nitrogen can be carried out and process.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 10m to be obtained3The average film filtering traffic processing water of/d
For 0.5m/d (=10m3/d÷20m2), can persistently carry out stable membrane filtration.
But, as shown in Figure 6, in embodiment 4, time of the delaying α in each intermittent aerating groove is different.Concrete, first
The beginning containing sludge water circulation between intermittent aerating groove and membrance separation groove, is to start in the aeration operation of the first intermittent aerating groove
After carry out immediately, on the other hand, between remaining intermittent aerating groove and membrance separation groove containing sludge water circulation beginning, be
The midway of aeration operation.And in remaining intermittent aerating groove, the second intermittent aerating groove and the delaying of intermittent aerating groove of the 3rd
Time α is different.Therefore, from each intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic entirety
Concentration is different, from the first intermittent aerating groove be transported to membrance separation groove containing the ammonia sludge water and organic overall density
High.Therefore, comparing to embodiment 1,2, the water quality containing sludge water in membrance separation groove is difficult to stable.
Additionally, in embodiment 4, the time period creating all intermittent aerating grooves aeration simultaneously (that is, is unsatisfactory for above-mentioned condition
(i)).Therefore, although identical with the quantity of the intermittent aerating groove of embodiment 2, but in embodiment 4, it is necessary to have and only may be used
Carrying out the blower fan of the disposal ability of aeration with the intermittent aerating groove to 3 grooves, compare to embodiment 2, first current cost increases.
Additionally, in embodiment 4, the most do not meet above-mentioned condition (iii).
[comparative example 1]
Using the sewage-treatment plant 2 shown in Figure 12, intermittent aerating groove is 1 groove, and the volumetric change of intermittent aerating groove is 20m3,
Time chart as shown in Figure 13 (b), stops the circulation containing sludge water, in addition, with enforcement during stopping aeration
Example 1 similarly carries out sewage disposal.In Figure 12, the symbol of the element identical with Fig. 1 is identical, and the description thereof will be omitted.
Additionally, in comparative example 1, the cycle-index of 1 day is 3 times, the former water in intermittent aerating groove in 1 circulation puts into
Amount is 3.33m3(=10m33 ÷ 1 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 4, t1/a+t2/a=2, it is unsatisfactory for above formula (1).
It addition, t1/t2=1, also it is unsatisfactory for above formula (2).
In comparative example 1, owing to stopping that the intermittent aerating groove under aeration state does not reflux containing sludge water, therefore stop aeration
Anaerobic state can be maintained in intermittent aerating groove under state, stable nitrogen can be carried out and process.
But, the membrane filtration time of every 1 day is 12 hours, compares to each embodiment, and filtration time is significantly restricted.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 10m to be obtained3The average film filtration flux processing water of/d
For 1.0m/d [=10m3/d÷20m2× (24 hours ÷ 12 hours)].
Typically, average film filtration flux when industrial wastewater is processed by membrane separation activated sludge process is 0.3～about 0.6m/d relatively
For properly.Therefore, the average film filtering traffic (1.0m/d) in comparative example 1 is the highest value, probably cannot persistently enter
The membrane filtration of line stabilization.
Additionally, due to the volume of intermittent aerating groove is 20m3, it is necessary to have and only can carry out 20m3The disposal ability of aeration
Blower fan, compares to 10m3The alternative aeration divided, preliminary expenses increases.
[comparative example 2]
Use the sewage-treatment plant 2 shown in Figure 12, as comparative example 1 under conditions of carry out sewage disposal.But, often
The process water yield of 1 day is 5m3/d。
In comparative example 2, the cycle-index of 1 day is 3 times, and the former water input amount in intermittent aerating groove in 1 circulation is 1.67m3
(=5m33 ÷ 1 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 4, t1/a+t2/a=2, it is unsatisfactory for above formula (1).
It addition, t1/t2=1, also it is unsatisfactory for above formula (2).
In comparative example 2, owing to stopping that the intermittent aerating groove under aeration state does not reflux containing sludge water, therefore stop aeration
Anaerobic state can be maintained in intermittent aerating groove under state, stable nitrogen can be carried out and process.
But, the membrane filtration time of every 1 day is 12 hours, compares to each embodiment, and filtration time is significantly restricted.
Additionally, due to the membrane area of hollow-fibre membrane is 20m2, 5m to be obtained3The average film filtering traffic processing water of/d is
0.5m/d [=5m3/d÷20m2× (24 hours ÷ 12 hours)], can persistently carry out stable membrane filtration.
Additionally, due to the volume of intermittent aerating groove is 20m3, it is necessary to have and only can carry out 20m3The disposal ability of aeration
Blower fan, compares to 10m3The alternative aeration divided, preliminary expenses increases.
[comparative example 3]
Use the sewage-treatment plant 2 shown in Figure 12, as comparative example 1 under conditions of carry out sewage disposal.But in,
The membrane area of hollow fiber film is 40m2。
In comparative example 3, the cycle-index of 1 day is 3 times, and the former water input amount in intermittent aerating groove in 1 circulation is 3.33m3
(=10m33 ÷ 1 grooves of/d ÷).
Additionally, due to the greatest common divisor (a) of t1 and t2 is 4, t1/a+t2/a=2, it is unsatisfactory for above formula (1).
It addition, t1/t2=1, also it is unsatisfactory for above formula (2).
In comparative example 3, owing to stopping that the intermittent aerating groove under aeration state does not reflux containing sludge water, therefore stop aeration
Anaerobic state can be maintained in intermittent aerating groove under state, stable nitrogen can be carried out and process.
But, the membrane filtration time of every 1 day is 12 hours, compares to each embodiment, and filtration time is significantly restricted.
Additionally, due to the membrane area of hollow-fibre membrane is 40m2, 10m to be obtained3The average film filtering traffic processing water of/d
For 0.5m/d [=10m3/d÷40m2× (24 hours ÷ 12 hours)], can persistently carry out stable membrane filtration.But,
Must use membrane area is 40m2Filter membrane, preliminary expenses (equipment investment etc.) can increase.
Additionally, due to the volume of intermittent aerating groove is 20m3, it is necessary to have and only can carry out 20m3The disposal ability of aeration
Blower fan, compares to 10m3The alternative aeration divided, preliminary expenses increases.
Claims (6)
1. a sewage water treatment method, is the method processing sewage by intermittent aerating membrane separation activated sludge process, has: will be located
Reason water imports intermittent aerating groove, aeration is repeated and stops aeration, being carried out the intermittent aerating carried out a biological disposal upon by activated sludge
Operation；
Being made up of biological treatment of water and activated sludge in intermittent aerating groove it is transported to membrance separation groove containing sludge water, carries out
The membrane filtration operation of membrane filtration；
The part in membrance separation groove is made to be back to the reflow process of intermittent aerating groove from membrance separation groove containing sludge water；
In the method, use multiple described intermittent aerating groove, control the operating of each intermittent aerating groove so that sewage disposal is carried out
Period has the intermittent aerating groove of more than 1 groove to be aeration state；
Between intermittent aerating groove and membrance separation groove under aeration state, carry out the transport containing sludge water and backflow.
Sewage water treatment method the most according to claim 1, wherein, is set to n, intermittent aerating work by the quantity of intermittent aerating groove
Aeration time in sequence is set to t1, stops aeration time and be set to the greatest common divisor of t2, t1 and t2 when being set to a, meets following formula
(1),
N=t1/a+t2/a (1).
Sewage water treatment method the most according to claim 2, wherein, between intermittent aerating groove and the membrance separation groove under aeration state
The transport containing sludge water carried out and the time started of backflow, the time started of the aeration being later than in this intermittent aerating groove.
4. according to the sewage water treatment method described in claims 1 to 3 any one, wherein, control the aeration of each intermittent aerating groove, make
The operating time point obtaining all intermittent aerating grooves is different.
5. a sewage-treatment plant, is the device being processed sewage by intermittent aerating membrane separation activated sludge process, possesses and have: import
There is processed water, aeration be repeated and stop aeration, being carried out the intermittent aerating groove carried out a biological disposal upon by activated sludge；
To the membrance separation carrying out membrane filtration containing sludge water being made up of biological treatment of water and activated sludge in intermittent aerating groove
Groove；
The part in membrance separation groove is made to be back to the reflux of intermittent aerating groove from membrance separation groove containing sludge water；
In this device, possessing and have multiple described intermittent aerating groove, the operating of each intermittent aerating groove is controlled so that at sewage
Reason has the intermittent aerating groove of more than 1 groove to be aeration state during carrying out；
Between intermittent aerating groove and membrance separation groove under aeration state, carry out the transport containing sludge water and backflow.
Sewage-treatment plant the most according to claim 5, wherein, the aeration of each intermittent aerating groove is controlled so that all
The operating time point of intermittent aerating groove is different.
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| JP2005211728A (en) * | 2004-01-28 | 2005-08-11 | Kubota Corp | Sewage treatment method |
| CN102730824A (en) * | 2011-03-29 | 2012-10-17 | 栗田工业株式会社 | Processing method of organic water discharge by membrane separation activated sludge device |
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| JPH1034185A (en) * | 1996-07-25 | 1998-02-10 | Mitsubishi Rayon Co Ltd | Drainage treatment method |
| JP3276904B2 (en) * | 1997-10-14 | 2002-04-22 | 住友重機械工業株式会社 | Wastewater treatment method |
| JP4690265B2 (en) * | 2006-08-04 | 2011-06-01 | メタウォーター株式会社 | Wastewater treatment method |
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| CN102730824A (en) * | 2011-03-29 | 2012-10-17 | 栗田工业株式会社 | Processing method of organic water discharge by membrane separation activated sludge device |
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