CN109205773A

CN109205773A - Wastewater treatment method and wastewater treatment equipment

Info

Publication number: CN109205773A
Application number: CN201810644476.7A
Authority: CN
Inventors: 杉本直也; 川岸朋树
Original assignee: Mitsubishi Kasei Corp
Current assignee: Mitsubishi Kasei Corp
Priority date: 2017-06-30
Filing date: 2018-06-21
Publication date: 2019-01-15

Abstract

Project of the invention is to provide a kind of wastewater treatment method and wastewater treatment equipment, in the wastewater treatment containing organic matter and containing at least one of organic nitrogen and ammonia nitrogen, can remove well organic nitrogen and ammonia nitrogen with efficiency.Wastewater treatment method of the invention includes: the production acid for generated by the organic matter in above-mentioned waste water organic acid is handled, and the process for obtaining the production acid processing water that organic acid content is 200mg/L or more, water is handled with the production acid handled for above-mentioned production acid, active sludge treatment is carried out using aerobic direct nitrogen bacterium, the process for obtaining the water containing Treatment of Sludge containing biological treatment of water and activated sludge.

Description

Wastewater treatment method and wastewater treatment equipment

Technical field

The present invention relates to the processing methods and waste water of the waste water containing organic matter and containing at least one of organic nitrogen and ammonia nitrogen Processing unit.

Background technique

As the waste water for the waste water containing at least one of organic nitrogen and ammonia nitrogen, especially food, animal husbandry The wastewater treatment of the waste water of ammonia and organic matter containing high concentration carries out organic matter processing, nitrogen processing.

One of organic matter processing is handled for methane fermentation.Methane fermentation processing has sludge yield few, province's energy excellent Point.

Methane fermentation processing includes: hydrolysis, the acid-producing using acid-producing bacteria and the methane fermentation using methane-producing bacteria React 3 reactions.In hydrolysis, organic matter contained by waste water (polysaccharide, lipid etc.) is hydrolyzed, generates low molecule organic matter (monosaccharide, glycerol, long-chain fat acids etc.).In acid-producing, low molecule organic matter is further divided, and generates lower aliphatic Sour (propionic acid, butyric acid, acetic acid etc.), alcohol, aldehyde etc..In methane fermentation reaction, lower fatty acid is further decomposed, and generates methane Deng.Acid-producing and methane fermentation reaction are to be utilized respectively the reaction of anerobe, are carried out under anaerobic conditions.

Methane fermentation device used in methane fermentation processing has: it is all react the single-channel type device that is carried out in a slot and The reaction until acid-producing is set to react the dual grooved device carried out in individual reactive tank respectively with methane fermentation.Respectively In process, there are suitable pH, the optimal pH of acid-producing is 5.5~6.5, and the optimal pH of methane fermentation reaction is 7~8.For The management for making it respectively under most suitable operating condition can be carried out, dual grooved device just becomes mainstream.In addition, existing literature mentions PH meter and oxidation-reduction potential (ORP) meter are provided on dual grooved device out, dual grooved Anaerobic Treatment is carried out by pH and ORP The running management (patent document 1) of device.

About nitrogen processing, stripping (stripping) processing, is based on endogenous denitrogenation side at the processing based on nitrification liquid endless form The processing of formula is common processing.

Based on the processing of nitrification liquid endless form, firstly, the ammonia nitrogen in raw water (waste water) is by nitrobacteria under aerobic condition It is converted into nitrite nitrogen or nitrate nitrogen.Then, using the reducing power of organic matter, under anaerobic, pass through denitrifying bacteria It is nitrogen by nitrite nitrogen or nitrate-nitrogen reduction.

Nitrobacteria is the nitrous acid oxygen that ammonium oxidation is oxidized to nitrate nitrogen for the ammonia oxidizing bacteria of nitrous acid, by nitrite nitrogen Change the general name of bacterium.Denitrifying bacteria is under anaerobic, by as electron acceptor and inciting somebody to action nitrite nitrogen or nitrate nitrogen Organic matter is used as electron donor, is the microorganism of nitrogen by nitrite nitrogen or nitrate-nitrogen reduction.

In recent years, the method as the waste water containing high strength ammonia as the waste water for handling animal husbandry, foodstuff, there is document proposition It can convert aerobic ammonia nitrogen to nitrogen and denitrogenation, facture (patent document 2) using Bacillus foecalis alkaligenes No.4 bacterial strain.

Bacillus foecalis alkaligenes No.4 bacterial strain is one of direct nitrogen bacterium of aerobic, belongs to heterotrophicy bacteria, and can be aerobic The direct gas of ammonia is turned to nitrogen by ground.In addition, compared with previous nitrobacteria, proliferation speed rapid with ammonia removal rate Spend also rapid advantage.

In addition, as treatment trough, 2 slots of aerobic slot (nitrifying groove) and anaerobic groove (denitrifying tank) are needed in nitrification liquid endless form, On the other hand, in the processing using Bacillus foecalis alkaligenes No.4 bacterial strain, only by Aerobic Process for Treatment nitrogen removing can just become can Can, therefore, the advantages of single slot is handled just can be used.

In addition, there is document proposition: as food, the wastewater treatment equipment of animal husbandry, in the follow-up phase of methane fermentation treatment trough In, have and removes treatment trough using the ammonia that the progress ammonia of aerobic direct nitrogen bacterium removes processing, will be generated in the treatment trough Gas from treatment trough gas bleeding export path and be set to the path and separate the ammonia separator of ammonia in gas gas Processing unit (patent document 3).In the processing unit, high concentration included in methane fermentation treated waste water (nitrification liquid) Ammonia is handled by the processing of aerobic direct nitrogen bacterium and stripping, to be removed.And it confirmed processing to true waste water Performance.

Existing technical literature

Patent document

1 Japanese Patent Laid-Open 2011-115721 bulletin of patent document

2 Japanese Patent Laid-Open 2002-199875 bulletin of patent document

3 Japanese Patent Laid-Open 2014-50767 bulletin of patent document

Summary of the invention

Invent the project solved

Aerobic direct nitrogen bacterium is only using organic acid as matrix.As recorded in Patent Document 3, pass through aerobic direct nitrogen When the nitrification liquid that bacterial treatment methane fermentation processing of gasifying generates, the Determination of Organic Acids that can become matrix in nitrification liquid is few, therefore, The nitrogen gasification result of aerobic direct nitrogen bacterium bring ammonia nitrogen is insufficient.If adding organic acid in nitrification liquid can change Kind nitrogen gasification result, but its improvement is also insufficient.In addition, also resulting in the increase of cost.

The purpose of the present invention is to provide: at the place of the waste water containing organic matter and containing at least one of organic nitrogen and ammonia nitrogen In reason, the wastewater treatment method and wastewater treatment equipment of organic nitrogen and ammonia nitrogen can be removed well with efficiency.

The means to solve the problem

The inventors discovered that following items, thereby completing the present invention: with the activated sludge tank of aerobic direct nitrogen bacterium In the preposition stage of the processing of progress, waste water is implemented to produce acid processing, produces acid processing water not as nitrification liquid, but directly The activated sludge tank that ground is supplied to follow-up phase is handled, so as to directly, the good progress nitrogen gasification reaction of efficiency And carry out nitrogen removing.

In the present invention, produce acid processing refer to by methane fermentation handle in the processing that constitutes of hydrolysis and acid-producing.

That is, the present invention has the following embodiments and the accompanying drawings.

(1) a kind of wastewater treatment method containing organic matter and contains the useless of at least one of organic nitrogen and ammonia nitrogen for processing The method of water, which is characterized in that including following processes:

Produce acid treatment process: the production acid for generated by the organic matter in above-mentioned waste water organic acid is handled, and is obtained organic acid and contained The process for the production acid processing water that amount is 200mg/L or more,

Active sludge treatment process: water is handled for the production acid that above-mentioned production acid is handled, uses aerobic direct nitrogen bacterium And active sludge treatment is carried out, the process for obtaining the water containing Treatment of Sludge containing biological treatment of water and activated sludge.

(2) wastewater treatment method according to (1), wherein the pH of above-mentioned production acid processing water is 5 or more, less than 8.

(3) wastewater treatment method according to (2), wherein in the processing of above-mentioned production acid, the pH of above-mentioned waste water is controlled in 5 Above, less than 8.

(4) wastewater treatment method according to any one of (1)~(3), wherein including separation process: separator is used The process that solid-liquid separation treatment is carried out to above-mentioned water containing Treatment of Sludge.

(5) wastewater treatment method according to (4), wherein above-mentioned separator is membrane separation device.

(6) wastewater treatment method according to (5), wherein above-mentioned membrane separation device, which is arranged at, carries out above-mentioned activated sludge In the active sludge treatment slot of processing.

(7) wastewater treatment method according to (5), wherein above-mentioned membrane separation device, which is arranged at, carries out above-mentioned activated sludge The follow-up phase of the active sludge treatment slot of processing.

(8) it the wastewater treatment method according to (7), wherein send process back to including sludge: will be separated with above-mentioned membrane separation device Activated sludge a part process for sending above-mentioned active sludge treatment slot back to from above-mentioned membrane separation device.

(9) wastewater treatment method according to any one of (1)~(8), wherein including neutralization step: above-mentioned production is being obtained After the process of acid processing water, the process that water is neutralized is handled to above-mentioned production acid.

(10) wastewater treatment method according to any one of (1)~(9), wherein add process containing thallus: to above-mentioned production The process of aerobic direct nitrogen bacterium is added in acid processing water.

(11) wastewater treatment method according to any one of (1)~(10), wherein above-mentioned aerobic direct nitrogen bacterium is Bacillus foecalis alkaligenes No.4 bacterial strain (FERM P-21814).

(12) a kind of wastewater treatment equipment containing organic matter and contains the useless of at least one of organic nitrogen and ammonia nitrogen for processing The device of water, which is characterized in that the wastewater treatment equipment includes:

Produce acid tank: the production acid for generated by the organic matter in above-mentioned waste water organic acid is handled, and makes its organic acid content be The production acid of 200mg/L or more handles water,

Active sludge treatment slot: it above-mentioned production acid is handled to obtain with aerobic direct nitrogen bacterium produces acid processing water to carry out activity dirty Mud processing, and make its water containing Treatment of Sludge containing biological treatment of water and activated sludge.

(13) wastewater treatment equipment according to (12), wherein the pH of above-mentioned production acid processing water is 5 or more, less than 8.

(14) wastewater treatment equipment according to (13), wherein be provided with pH determination part in slot in above-mentioned production acid tank, measure The pH of waste water in above-mentioned production acid tank；Sour addition portion adds acid into above-mentioned production acid tank；With alkali addition portion, to above-mentioned production acid tank Alkali is added, is consisted of: according to the pH measured with pH determination part in above-mentioned slot, acid or alkali are added into above-mentioned production acid tank, from And the pH of above-mentioned waste water can be adjusted to 5 or more, less than 8.

(15) wastewater treatment equipment according to any one of (12)~(14), wherein containing to above-mentioned water containing Treatment of Sludge Carry out the separator of solid-liquid separation treatment.

(16) wastewater treatment equipment according to (15), wherein above-mentioned separator is membrane separation device.

(17) wastewater treatment equipment according to (16), wherein above-mentioned membrane separation device is arranged at above-mentioned activated sludge It manages in slot.

(18) wastewater treatment equipment according to (16), wherein above-mentioned membrane separation device is arranged at above-mentioned activated sludge Manage the follow-up phase of slot.

(19) wastewater treatment equipment according to (18), wherein send device back to including sludge, which will use above-mentioned UF membrane A part of the activated sludge of device separation sends above-mentioned active sludge treatment slot back to from above-mentioned membrane separation device.

(20) wastewater treatment equipment according to any one of (12)~(19), wherein in the follow-up phase of above-mentioned production acid tank Including the neutralization chamber being neutralized to above-mentioned production acid processing water.

(21) wastewater treatment equipment according to any one of (12)~(20), wherein including into above-mentioned production acid processing water Add the thallus adding set of aerobic direct nitrogen bacterium.

(22) wastewater treatment equipment according to any one of (12)~(21), wherein above-mentioned aerobic direct nitrogen bacterium For Bacillus foecalis alkaligenes No.4 bacterial strain (FERM P-21814).

Invention effect

Wastewater treatment method and wastewater treatment equipment of the invention can be containing organic matter and containing in organic nitrogen and ammonia nitrogen In the processing of at least one waste water, efficiency removes organic nitrogen and ammonia nitrogen well.

Detailed description of the invention

[Fig. 1] shows the schematic configuration diagram of the wastewater treatment equipment of first embodiment of the invention.

[Fig. 2] shows the schematic configuration diagram of the wastewater treatment equipment of second embodiment of the present invention.

[Fig. 3] shows the schematic configuration diagram of the wastewater treatment equipment of third embodiment of the present invention.

[symbol description]

1 wastewater treatment equipment, 2 wastewater treatment equipments, 3 wastewater treatment equipments, 11 production acid tanks, 12 first flow path, 13 second flow paths, 13a is pumped, pH determination part in 14 slots, 15 sour addition portions, 15a acid holding vessel, and 15b acid supplies flow path, and 15c is pumped, 16 alkali addition portions, 16a alkali holding vessel, 16b alkali supply flow path, 16c pump, 17 control units, 21 active sludge treatment slots, 22 air diffusion apparatus, 22a air-dispersing Pipe, 22b ingress pipe, 22c air blower, 25 sludge extract flow path, 25a valve, 27 the 5th flow paths, 30 thallus adding sets, 31 thallus out Reserve tank, 32 thallus supply flow path, 32a pump, 40 ammonia removing devices, 41 third flow paths, 42 ammonia removing devices, 50 UF membranes dress It sets, 51 UF membrane slots, 52 membrane modules, 53 the 4th flow paths, 53a pump, 54 air diffusion apparatus, 54a diffuser, 54b ingress pipe, 54c drum Blower, 55 sludge send device back to, and 55a sludge sends flow path back to, and 55b is pumped, 61 reserve tanks, 71 neutralization chambers, 72 the 6th flow paths, in 74 slots PH determination part, 75 sour addition portions, 75a acid holding vessel, 75b acid supply flow path, and 75c is pumped, 76 alkali addition portions, 76a alkali holding vessel, 76b alkali supplies flow path, 76c pump, 77 control units

Specific embodiment

Hereinafter, the present invention will be described in detail for display embodiment.But the present invention and non-exclusively it is construed to these embodiments.

In addition, " organic matter " refers to the organic acid of the matrix as aerobic direct nitrogen bacterium, and is producing sour work in the present invention Become the substance (polysaccharide, lipid etc.) of organic acid, generally polysaccharide, lipid, citric acid, acetic acid in sequence.Wherein, from becoming From the point of view of the matrix of aerobic direct nitrogen bacterium, preferred organic acid, more preferable acetic acid, citric acid.

In addition, " organic nitrogen " refers to nitrogen contained by organic principle, generally protein, amino acid." ammonia nitrogen " refers in nitrogen component Ammonium salt, also comprising above-mentioned protein, amino acid by produce acid handle caused by ammonium salt.

" aerobic direct nitrogen bacterium " refers to, by the heterotrophic microorganism of ammonia nitrogen nitrogen under aerobic condition.In addition, also referring to will have Machine nitrogen converts the microorganism that (oxidation) is ammonia nitrogen.

In addition, in the present invention, the waste water before active sludge treatment is also referred to as " raw water ", produces acid treated that waste water is also referred to as " producing Acid processing water ", methane fermentation treated waste water is also referred to as " methane fermentation processing water ", the production acid processing after active sludge treatment Water is also referred to as " biological treatment of water ", the water containing Treatment of Sludge (in particular penetrating the biological treatment of water of filter membrane) after film process Referred to as " infiltration water ".

First embodiment

Wastewater treatment equipment of the invention is, handles the waste water containing organic matter and containing at least one of organic nitrogen and ammonia nitrogen Device.

Fig. 1 is the schematic configuration diagram of the wastewater treatment equipment 1 of first embodiment of the invention.In addition, for convenience of explanation, figure Size ratio in 1 is different from actual size.Following Fig. 2~3 are also the same.

The wastewater treatment equipment 1 of present embodiment, which has, produces acid tank 11, active sludge treatment slot 21, thallus adding set 30, ammonia Removing device 40, membrane module 52 (membrane separation device) and reserve tank 61.After active sludge treatment slot 21 is set to production acid tank 11 The continuous stage.Thallus adding set 30 and ammonia removing device 40 are respectively arranged at active sludge treatment slot 21.Membrane module 52 is set to In active sludge treatment slot 21.Reserve tank 61 is set to the follow-up phase of active sludge treatment slot 21.

(waste water)

Process object waste water of the invention is the treated water from discharges such as factory, places of business, containing organic matter, and is had At least one of machine nitrogen and ammonia nitrogen.As the example of such waste water, following waste water can be enumerated.

(1) contain organic matter and organic nitrogen, the waste water without ammonia nitrogen.

(2) contain organic matter and ammonia nitrogen, the waste water without organic nitrogen.

(3) waste water containing organic matter, organic nitrogen and ammonia nitrogen.

(producing acid tank)

Producing acid tank 11 is to carry out biological wastewater treatment (carrying out Anaerobic Treatment by acid-producing bacteria) to fill the slot of microorganism. Specifically, the production acid for carrying out carrying out being generated organic acid to waste water by organic matter is handled, and is become and is produced the biological of acid processing water The slot of wastewater treatment.Acid-producing bacteria can be the well known acid-producing bacteria as the acid-producing bacteria in methane fermentation.

It produces acid processing and refers to the processing for generating organic acid by the organic matter in waste water, typically in progress methane fermentation processing Until the processing of the reaction in the preposition stage of methane fermentation reaction.It produces in acid processing, reaction and acid-producing, waste water is hydrolyzed Contained organic matter is decomposed organic acid (propionic acid, butyric acid, acetic acid etc.).Therefore, it produces acid processing water and contains the organic acid.

In methane fermentation processing, further progress methane fermentation reaction, organic acid is further divided.If having carried out methane hair Ferment reaction, then the content of organic acid is with regard to low.Methane fermentation, which is handled, is free of organic acid in water, only one containing organic acid Point point.

Therefore, it produces acid processing water and refers to and produce acid treated processing water to waste water, it may be said that it contains certain above content By produce acid processing generate organic acid.

In the present invention, even if carrying out methane fermentation reaction after acid-producing, as long as organic acid content is that 200mg/L or more can To be handled as production acid processing water.

Generally, the total amount that the organic acid content in acid processing water is propionic acid, butyric acid and acetic acid is produced.Organic acid content is preferred 2000mg/L or more, more preferable 3000mg/L or more, particularly preferred 4000mg/L or more.

From the processing water for reducing discharge (in active sludge treatment water) from the point of view of remaining organic acid, acid processing water is produced In the preferred 15000mg/L of organic acid content hereinafter, particularly preferably 10000mg/L or less.

Therefore, the organic acid content in production acid processing water, preferably 200~15000mg/L, more preferable 2000~15000mg/L, into One step preferably 3000~15000mg/L, particularly preferred 4000~15000mg/L, most preferably 4000~10000mg/L.

The function of organic acid is the matrix as aerobic direct nitrogen bacterium.Especially, the organic acid generated by producing acid processing Matrix as aerobic direct nitrogen bacterium is useful.If the content of organic acid is more than above-mentioned lower limit value, just The nitrogen gasification result of aerobic direct nitrogen bacterium bring ammonia nitrogen can fully be played.

Also contain ammonia nitrogen in addition, producing in acid processing water.The ammonia nitrogen has the ammonia nitrogen contained originally in waste water, also has by producing acid processing The ammonia nitrogen that itrogenous organic substance (organic nitrogen) is decomposed to generate.

In general, the ammonia-nitrogen content produced in acid processing water is 500~1000mg/L or so.

Acid tank 11 is produced to be connected with one end of one end of first flow path 12 and second flow path 13.The other end of second flow path 13 and work Property Treatment of Sludge slot 21 connect.

First flow path 12 is for making to flow into the flow path for producing acid tank 11 from the waste water of the discharges such as pig farm.

Second flow path 13 is the active sludge treatment for being supplied to follow-up phase for that will produce the production acid processing water generated in acid tank 11 The flow path of slot 21.Second flow path 13 is provided with pump 13a, pumps 13a by operating, is supplied to make to produce acid processing water from producing acid tank 11 Active sludge treatment slot 21 should be entered.

PH determination part 14 in slot, sour addition portion 15 and alkali addition portion 16 are provided in acid tank 11 in addition, producing.In addition, pH is surveyed in slot Determine portion 14, sour addition portion 15 and alkali addition portion 16 and is connected to control unit 17.

PH determination part 14, sour addition portion 15 and alkali addition portion 16 are the dresses for monitoring and controlling the pH in production acid tank 11 in slot It sets.PH influence acid-producing be easy to carry out degree, methane fermentation reaction be difficult to carry out degree, by monitoring and controlling The pH in acid tank 11 is produced, makes that acid-producing is easy to carry out and methane fermentation reaction is difficult to the pH that carries out, so as to press down The reduction of the content of organic acid caused by system progress methane fermentation reaction.

The measurement of pH determination part 14 produces the pH of the waste water in acid tank 11 in slot.Various pH measurement dresses can be used in pH determination part 14 in slot It sets.

Sour addition portion 15 is sour to addition in acid tank 11 is produced.Sour addition portion 15 has sour holding vessel 15a, acid supply flow path 15b and sets It is placed in the pump 15c of acid supply flow path 15b.By making to pump 15c operating, so that the acid (acid solution etc.) in sour holding vessel 15a is added It is added on and produces in acid tank 11.

Alkali is added into production acid tank 11 in alkali addition portion 16.Alkali addition portion 16 has alkali holding vessel 16a, alkali supply flow path 16b and sets It is placed in the pump 16c of alkali supply flow path 16b.By making to pump 16c operating, so that the alkali (aqueous slkali etc.) in alkali holding vessel 16a is added It is added on and produces in acid tank 11.

Control unit 17 is configured to: according to the pH that pH determination part 14 in slot measures to control sour addition portion 15 and alkali addition portion 16, make produce acid tank 11 in waste water pH maintain 5 or more, less than 8 in the range of.

In acid-producing be suitable for pH 5 or more, less than 8 in the range of, especially in the range below 5.5 or more 6.5.It is logical It crosses and maintains the pH for producing the waste water in acid tank 11 in the range, acid-producing carries out well.If produced useless in acid tank 11 The pH of water is maintained within the above range, then what is generated produces the sour pH for handling water also within the above range.

Control unit 17 may be for example to have at the calculations such as CPU (central processing unit, Central Processing Unit) Manage the component of device.

The operating of control unit 17 is illustrated.

Out of slot pH determination part 14 be input to control unit 17 pH (pH for producing the waste water in acid tank 11) it is more suitable than preset PH range upper limit for height when, control unit 17 make pump 15c start running, make the acid in sour holding vessel 15a, via acid supply flow path 15b, which is flowed into, produces acid tank 11.Later, if the pH in 14 input control portion 17 of pH determination part is within the scope of suitable pH out of slot, that Just stop the operating for pumping 15c.

On the other hand, when the pH in 14 input control portion 17 of pH determination part is lower than the lower limit of suitable pH range out of slot, control unit 17 make pump 16c start running, and flow into the alkali in alkali holding vessel 16a via alkali supply flow path 16b and produce acid tank 11.Later, if The pH in 14 input control portion 17 of pH determination part is within the scope of suitable pH out of slot, then just stopping the operating for pumping 16c.

Alternatively, it is also possible to be not provided with control unit 17, and the pH measured according to pH determination part 14 in slot, manual switching pump 15c, 16c Operating.

It monitors it is preferred that producing setting in acid tank 11 and controls the device for producing the conditions such as temperature, oxidation-reduction potential in acid tank 11.With PH compares, and the influence of these conditions is small, but in the same manner as pH, influence acid-producing is easy to carry out degree, methane hair What ferment reacted is difficult to carry out degree.By monitoring and controlling these conditions, acid-producing is set to be easy to progress and methane hair to reach Ferment reaction is difficult to the condition that carries out, so as to the reduction of organic acid content caused by inhibiting methane fermentation reaction to carry out.

(active sludge treatment slot)

Active sludge treatment slot 21 is to carry out biological wastewater treatment (active sludge treatment) to fill microorganism (activity Sludge) slot.Specifically are as follows: carry out active dirt to from the production acid processing water for producing acid tank 11 with aerobic direct nitrogen bacterium Mud processing, makes its slot containing the water containing Treatment of Sludge of biological treatment of water and activated sludge.

Contain organic acid and ammonia nitrogen as described above, producing in acid processing water.The activated sludge of aerobic direct nitrogen bacterium is used In processing, aerobic direct nitrogen bacterium is to produce the organic acid in acid processing water as matrix, aerobicly by the direct nitrogen of ammonia nitrogen Change, obtains production acid processing water (biological treatment of water) of denitrogenation.It is particularly described below aerobic direct nitrogen bacterium.

Active sludge treatment slot 21 is connect with the other end of second flow path 13, is supplied to work by production acid tank 11 so as to produce acid processing water Property Treatment of Sludge slot 21.

In addition, active sludge treatment slot 21 is connect with one end of sludge extraction flow path 25.Valve is provided in sludge extraction flow path 25 25a。

It is the flow path for extracting activated sludge out from active sludge treatment slot 21 that sludge, which extracts flow path 25 out,.Usually presumption activated sludge Cell concentration in treatment trough 21 is higher, and biological treatment performance is higher.But if cell concentration is excessively high, when film process, film group The blocking possibility of part 52 increases.Therefore, it when cell concentration is excessively increased, can be flowed by opening valve 25a and being extracted out by sludge Activated sludge is discharged in road 25, to control cell concentration.

Air diffusion apparatus 22 is provided in active sludge treatment slot 21 and below membrane module 52.Air diffusion apparatus 22 is used as maintaining in slot For aerobic condition.In addition, being also used for the washing of membrane module 52 in present embodiment.

Air diffusion apparatus 22 has the diffuser 22a being passed through air in active sludge treatment slot 21, supplies air to diffuser 22a Ingress pipe 22b and be sent into empty air blower 22c.

As diffuser 22a, without special as long as the device that can be sprayed the air supplied by air blower 22c upwards It limits, it can be mentioned, for example perforation single tubes, the diffuser of film-type.

PH, oxidation-reduction potential, water temperature, the ammonia that the production acid processing water in measurement slot can be set in active sludge treatment slot 21 are dense The various mensuration machines (omitting in the example shown) of degree etc..

Especially in biological respinse, pH control is important, the pH acidification or alkalization of the production acid processing water in slot When, the device for adding alkali or acid is preferably further set, and according to the pH in slot, alkali or acid are added into active dirt In mud treatment trough 21.As such device, it can be mentioned, for example with pH determination part 14, sour addition portion 15 and alkali addition portion 16 in slot Same device.

(thallus adding set)

Thallus adding set 30 adds aerobic direct nitrogen bacterium to sour handle in water is produced.

The thallus adding set 30 of present embodiment adds aerobic direct in the production acid processing water into active sludge treatment slot 21 Nitrogen bacterium.

Thallus adding set 30 has bacteriophage stock slot 31 and thallus supply flow path 32.

Bacteriophage stock slot 31 is the slot for storing aerobic direct nitrogen bacterium.

One end that thallus supplies flow path 32 connects bacteriophage stock slot 31, and the other end connects active sludge treatment slot 21.Thallus supply Pump 32a is provided in flow path 32.32a is pumped by operating, so that the aerobic direct nitrogen bacterium supply in bacteriophage stock slot 31 Enter in active sludge treatment slot 21.

It is preferred that having heating or cooling-part (omitting in the example shown) in bacteriophage stock slot 31, to be able to maintain that bacteriophage stock slot Temperature is suitable temperature in 31.Preferably 0~15 DEG C of temperature in tank.Furthermore it is preferred that setting is just like can be in bacteriophage stock slot 31 Cultivated in bacteriophage stock slot 31 aerobic direct nitrogen bacterium device (agitating device, aerator, culture medium addition dress It sets.It omits in the example shown).

As aerobic direct nitrogen bacterium, it can be mentioned, for example Bacillus foecalis alkaligenes No.4 bacterial strain (Alcaligenes faecalis No.4) the Alcaligenes such as (FERM P-21814), Bacillus foecalis alkaligenes OKK17 bacterial strain (Alcaligenes faecalis OKK17) Bacterium；The bacillus such as methylotrophy Bacillus strain L7 (Bacillus methylotrophicus strain L7) Bacterium etc..In addition, in addition to the foregoing, Rhodococcus sp sp.CPZ24. also can be used as aerobic direct nitrogen bacterium (Rhodococcus sp.CPZ24.), agrobacterium sp.LAD9 (Agrobacterium sp.LAD9), Pseudomonas stutzeri YZN-001 (Pseudomonas stutzeri YZN-001), providencia rettgeri YL (Providencia rettgeri YL) etc..These aerobic direct nitrogen bacteriums can be also used in combination with a kind of exclusive use with two or more.

From the point of view of culture efficiency, growth rate, nitric efficiency, the aerobic direct preferred Bacillus foecalis alkaligenes of nitrogen bacterium No.4 bacterial strain.

(ammonia removing device)

Ammonia removing device 40 has third flow path 41, ammonia removes equipment 42.One end of third flow path 41 connects active sludge treatment Slot 21, the other end opens in atmosphere.Ammonia removes equipment 42 and is arranged on third flow path 41.

Ammonia removing device 40 is the device that the ammonia to disperse is removed from the production acid processing water in active sludge treatment slot 21.

As described above, the production acid processing water in active sludge treatment slot 21 contains the ammonia nitrogen of high concentration.Ammonia nitrogen is by aerobic direct nitrogen Gasify bacterium nitrogen, but due to stripping effect, thus a part of ammonia nitrogen is handled in the form of gasiform ammonia from production acid It disperses out in water.Ammonia removing device 40 removes the ammonia to disperse.

Gas containing the ammonia to disperse from production acid processing water is imported into ammonia and removes equipment 42, remove deammoniation by third flow path 41 Later, it is thrown into atmosphere.

Ammonia removes equipment 42 and is not particularly limited, and can enumerate the device of the oxygenolysis of the ammonia using catalyst etc., based on absorption tower Ammonia absorption plant, ammonia burner etc..

(membrane module)

Membrane module 52 to it is being generated in active sludge treatment slot 21, containing biological treatment of water and activated sludge contain Treatment of Sludge Water carries out solid-liquid separation treatment.

Membrane module 52 has filter membrane, by the filter membrane, makes a living so that water containing Treatment of Sludge be made to be separated by solid-liquid separation (film process) Object handles water and activated sludge.In addition, membrane module 52 is arranged in active sludge treatment slot 21 in present embodiment, therefore, It can also expect mentioning for the biological decomposition process performance due to caused by the inspissation of the thallus in active sludge treatment slot 21 It is high.

In addition, membrane module 52 is connect with one end of the 4th flow path 53.The other end of 4th flow path 53 is connect with reserve tank 61.4th Pump 53a is provided in flow path 53.By making to pump 53a operating, to penetrate the infiltration water of the filter membrane of membrane module 52 (at biology Manage water) it is discharged from membrane module 52, it is supplied into reserve tank 61.

As filter membrane, it is not particularly limited as long as the film with filter capacity, it can be mentioned, for example: hollow-fibre membrane is put down Film, tubular film, integral post (Monolith) type film etc..Wherein, from volume filling rate it is high from the point of view of, preferred doughnut Film.

As filter membrane, when using hollow-fibre membrane, as its material, it can be mentioned, for example: celluloses, polyolefin, polysulfones, poly- inclined Difluoroethylene (PVDF), polytetrafluoroethylene (PTFE) (PTFE) etc..Wherein, as the material of hollow-fibre membrane, from chemical reagent resistance and From the point of view of resistance to pH variability is strong, preferably PVDF, PTFE.As filter membrane, using when whole column type film, it is preferable to use ceramics The film of system.

As the average pore size of micropore formed in filter membrane, the commonly referred to as film of ultrafiltration membrane is 0.001~0.1 μm or so, Commonly referred to as the film of refined filtration film is 0.1~1 μm or so.Present invention preferably uses average pore size (0.001~1 μ within the above range M or so) filter membrane.

(reserve tank)

The biological treatment of water (infiltration water) that the storage of reserve tank 61 is mutually separated by solid-liquid separation treatment with activated sludge.

In the wastewater treatment method for having used wastewater treatment equipment 1 as shown in Figure 1, firstly, make to be discharged from pig farm etc. Waste water flows into via first flow path 12 and produces acid tank 11.It is in advance maintained at acid-producing bacteria to produce in acid tank 11.Then, make to produce acid tank It maintains under anaerobic, to keep acid-producing bacteria preferential, waste water is carried out to produce sour processing in 11, (be produced at acid as acid processing water is produced Science and engineering sequence).

Then, via second flow path 13, make to produce acid processing water from the production inflow active sludge treatment slot 21 of acid tank 11.Then, pass through Aerobic direct nitrogen bacterium is added into (bacterium in the processing water of the production acid in active sludge treatment slot 21 by thallus adding set 30 Body adds process).In addition, the air diffusion apparatus 22 in starting active sludge treatment slot 21, makes to maintain under aerobic condition in slot, and Active sludge treatment is carried out to acid processing water is produced, as water containing Treatment of Sludge (active sludge treatment process).

In active sludge treatment process, the ammonia nitrogen in acid processing water is produced by aerobic direct nitrogen bacterium nitrogenization, and from production Acid processing water removes denitrification.At this point, the organic acid produced in acid processing water is consumed by aerobic direct nitrogen bacterium.Further, since blowing De- effect, thus a part of ammonia nitrogen is dispersed out from production acid processing water in the form of gasiform ammonia.Therefore, will fly containing this The gas of scattered ammonia, imports ammonia by third flow path 41 from active sludge treatment slot 21 and removes equipment 42, removes equipment 42 with ammonia Except deammoniation (ammonia removal step of dispersing).Then, the gas that ammonia is removed is exhausted into atmosphere.

Then, by starting pump 53a and to depressurizing in membrane module 52, contain Treatment of Sludge in active sludge treatment slot 21 Water carries out solid-liquid separation treatment (separation process).In present embodiment, separation process carries out in active sludge treatment slot 21.

When separation of solid and liquid, by the way that air is imported membrane module 52 from air diffusion apparatus 22, to pass through air washing (air Scrubbing the filter membrane surface of membrane module 52) is washed, while can be separated by solid-liquid separation well with efficiency at activated sludge and biology Manage water.

Storage is supplied into from membrane module 52 via the 4th flow path 53 through the biological treatment of water (infiltration water) of the filter membrane of membrane module 52 It deposits slot 61 and is stored.

Acid treatment process is produced preferably to carry out under conditions of acid-producing is easy to carry out and methane fermentation reaction is difficult to carry out.Methane In fermentation reaction, the organic acid that acid-producing generates is further divided, and becomes having for the matrix of aerobic direct nitrogen bacterium The content of machine acid reduces.

As the condition for being difficult to carry out that acid-producing is easy to progress and methane fermentation reacts is influenced, can enumerate: pH, temperature etc.. The especially influence of pH is big.

As described above, the pH in acid-producing is suitable for most preferably 5.5 or more 6.5 models below in the range of 5 less than 8 In enclosing.If pH, less than 8, methane fermentation reaction is just difficult to carry out.If pH is 5 or more, acid-producing bacteria does not predispose to damage.

It is therefore preferable that in producing acid treatment process, in the range of the pH of the waste water produced in acid tank 11 is maintained 5 less than 8, It particularly preferably maintains in 5.5 or more 6.5 or less range.

In order to make above-mentioned pH within the above range, in producing acid treatment process, for example, persistently being measured by pH determination part 14 in slot The pH of the waste water in acid tank 11 is produced, and acid or alkali is added as needed.

Temperature (produce acid tank 11 in temperature) in acid-producing, typically 20 DEG C or more, less than 40 DEG C, preferably 25~37 ℃.If temperature is less than 20 DEG C, it is possible to without activity, if at 40 DEG C or more, it is possible to which thallus dies.

Angularly consider from nitrogen removing performance, thallus sedimentation separation, thallus adds in process, and aerobic direct nitrogen bacterium adds Dosage be preferably make unit volume production acid processing water aerobic direct nitrogen bacterium dry mass concentration 2,000~ The amount of 20,000mg/L.

In active sludge treatment process, cell concentration in active sludge treatment slot 21, with MLSS (mixed liquor suspended solid, MLSS, Mixed Liquor Suspended Solid) densimeter, preferably 2000~20000mg/L, preferably 5000~10000mg/L.

PH preferably 7~9 in active sludge treatment slot 21.

Preferably 20~35 DEG C of temperature in active sludge treatment slot 21.

In the wastewater treatment equipment and wastewater treatment method of the first embodiment of present invention mentioned above, waste water is produced Acid processing, to the obtained active sludge treatment for producing acid processing water and used aerobic direct nitrogen bacterium.With methane Fermentation process water is compared, and the content for producing the organic acid of the good matrix as aerobic direct nitrogen bacterium of acid processing water is more. Therefore, when active sludge treatment, even if not adding organic acid additionally, aerobic direct nitrogen bacterium can also effectively be made to play Nitrogen removing is effectively performed in effect.

Therefore, the solid-liquid separation treatment of water containing Treatment of Sludge biological treatment of water obtained from as being generated to active sludge treatment Nitrogen content it is few enough.

Especially, in present embodiment, the separator as used in solid-liquid separation treatment is in active sludge treatment slot 21 Set membrane module 52 (membrane separation device), therefore, aerobic direct nitrogen bacterium are difficult to flow from active sludge treatment slot 21 Out, the biomass in sufficient active sludge treatment slot can be maintained.Therefore, aerobic direct nitrogen bacterium can be made more effective Ground plays a role, and the efficiency that nitrogen can be made to remove is more excellent.

In addition, in present embodiment, by ammonia removing device 40, to remove the ammonia scattered from production acid processing powder-refining with water.Therefore, can press down It makes ammonia nitrogen concentration caused by the ammonia to disperse is dissolved into production acid processing water again to increase, and nitrogen removal efficiency is more excellent.

Second embodiment

Fig. 2 is the schematic configuration diagram of the wastewater treatment equipment 2 of second embodiment of the present invention.In addition, following reality as shown It applies in mode, constituent element same as the first embodiment uses identical symbol, and the description thereof will be omitted.

The wastewater treatment equipment 2 of present embodiment, which has, produces acid tank 11, active sludge treatment slot 21, thallus adding set 30, ammonia Removing device 40, membrane separation device 50, sludge send device 55 and reserve tank 61 back to.Active sludge treatment slot 21 is arranged at production acid The follow-up phase of slot 11.Thallus adding set 30 and ammonia removing device 40 are arranged at active sludge treatment slot 21 respectively.Film point From the follow-up phase that device 50 is arranged at active sludge treatment slot 21.Sludge sends device 55 and membrane separation device 50 and activity back to Treatment of Sludge slot 21 connects.Reserve tank 61 is arranged at the follow-up phase of membrane separation device 50.

Membrane separation device 50 has UF membrane slot 51, set membrane module 52 and is set under membrane module 52 in UF membrane slot 51 The film washing air diffusion apparatus 54 of side.

(producing acid tank)

The production acid tank 11 of present embodiment is identical as the production acid tank 11 of first embodiment.

(active sludge treatment slot)

In addition to membrane module 52 not set in slot, the sludge for connecting with one end of the 5th flow path 27 and sending device 55 back to sludge are sent back to Other than one end connection of flow path 55a, at the active sludge treatment slot 21 of present embodiment and the activated sludge of first embodiment It is identical to manage slot 21.The other end of 5th flow path 27 is connect with the UF membrane slot 51 of membrane separation device 50.

5th flow path 27 is for making the activated sludge in active sludge treatment slot 21 contain the flow path that water flows into UF membrane slot 51.

(thallus adding set)

The thallus adding set 30 of present embodiment and the thallus adding set 30 of first embodiment are identical.

(ammonia removing device)

The ammonia removing device 40 of present embodiment and the ammonia removing device 40 of first embodiment are identical.

(membrane separation device)

UF membrane slot 51 is storage from the sludge containing activated sludge and biological treatment of water that active sludge treatment slot 21 is sent into Manage the slot of water.

The membrane module 52 of present embodiment and the membrane module 52 of first embodiment are identical.

Air diffusion apparatus 54 have air is carried out to the diffuser 54a of air-dispersing in UF membrane slot 51, by air supply in diffuser The ingress pipe 54b of the 54a and air blower 54c for being sent into air.As diffuser 54a, can enumerate scattered with first embodiment The same diffuser of 22 diffuser 22a of device of air.

(sludge sends device back to)

Sludge, which sends device 55 back to, to send work back to from membrane separation device 50 by a part of the isolated activated sludge of membrane separation device 50 Property Treatment of Sludge slot 21.

Sludge, which sends device 55 back to and has sludge and send back to, flow path 55a and is set to the pump 55b that sludge sends flow path 55a back to.Sludge is sent back to Flow path 55a is the flow path for following processes: making a part of the water containing Treatment of Sludge in UF membrane slot 51 from UF membrane slot 51 Discharge flows into (supply) active sludge treatment slot 21.By making to pump 55b operating, so as to which dirt will be contained in UF membrane slot 51 A part of mud processing water sends active sludge treatment slot 21 back to from UF membrane slot 51.

(reserve tank)

The reserve tank 61 of present embodiment and the reserve tank 61 of first embodiment are identical.

In the wastewater treatment method for having used wastewater treatment equipment 2 as shown in Figure 2, firstly, making from the useless of the discharges such as pig farm Water flows into via first flow path 12 and produces acid tank 11.It is in advance maintained at acid-producing bacteria to produce in acid tank 11.Then, make to produce in acid tank 11 It maintains under anaerobic, waste water to be carried out to produce sour processing, becomes production acid processing water (producing acid treatment process).

Then, via second flow path 13, make to produce acid processing water from the production inflow active sludge treatment slot 21 of acid tank 11.Then, pass through Aerobic direct nitrogen bacterium is added into (bacterium in the processing water of the production acid in active sludge treatment slot 21 by thallus adding set 30 Body adds process).In addition, the air diffusion apparatus 22 in starting active sludge treatment slot 21, makes to maintain under aerobic condition in slot, and Active sludge treatment is carried out to acid processing water is produced, makes its water containing Treatment of Sludge (active sludge treatment process).

In active sludge treatment process, as described above, by stripping effect, a part of ammonia nitrogen in the form of gasiform ammonia from It produces and disperses out in acid processing water.Therefore, by the gas containing the ammonia to disperse, pass through third flow path from active sludge treatment slot 21 41, which import ammonia, removes equipment 42, removes in equipment 42 in ammonia and removes deammoniation (ammonia removal step of dispersing).Then, the gas that ammonia is removed It is exhausted into atmosphere.

Then, production acid processing water (biological treatment of water) by active sludge treatment is together with activated sludge, as containing at sludge Water is managed, flows into UF membrane slot 51 via the 5th flow path 27.Then, right by starting pump 53a and to being depressurized in membrane module 52 Water containing Treatment of Sludge in UF membrane slot 51 carries out solid-liquid separation treatment (separation process).

When separation of solid and liquid, by the way that air is imported membrane module 52 from air diffusion apparatus 54, thus by air washing to membrane module 52 Filter membrane surface washed, while can be separated by solid-liquid separation well with efficiency.

In addition, sending a part that the activated sludge in UF membrane slot 51 contains water back to device 55 by sludge sends activated sludge back to Treatment trough 21 (sludge sends process back to).

Storage is supplied into from membrane module 52 via the 4th flow path 53 through the biological treatment of water (infiltration water) of the filter membrane of membrane module 52 Slot 61 is deposited, and is stored.

Produce acid treatment process, thallus addition process, the respective optimum condition of active sludge treatment process and first embodiment Wastewater treatment method is identical.

Sludge is sent back in process, generally, sends sludge quantity preferred process back to from membrane separation device 50 to active sludge treatment slot 21 1~5 times of water.

In the wastewater treatment equipment and wastewater treatment method of the second embodiment of present invention mentioned above, due to useless Water carries out producing sour processing, and used at the activated sludge of aerobic direct nitrogen bacterium to obtained production acid processing water Reason therefore,, can also be effectively even if not adding organic acid additionally when active sludge treatment in the same manner as first embodiment So that aerobic direct nitrogen bacterium is played a role, nitrogen removing is effectively performed.

In addition, in present embodiment, due to UF membrane slot of the solid-liquid separation treatment in the follow-up phase of active sludge treatment slot 21 It is carried out in 51, therefore, compared with when solid-liquid separation treatment carries out in active sludge treatment slot 21, has and be easy to maintain thallus Amount, the stabilized advantage of water quality treatment.

Especially, in present embodiment, device is sent back to due to having sludge: by a part of the activated sludge in UF membrane slot 51 It sends active sludge treatment slot 21 back to, therefore, can fully maintain the biomass in active sludge treatment slot 21.Therefore, more have Effect ground makes aerobic direct nitrogen bacterial action, and the efficiency that nitrogen removes is more excellent.

Third embodiment

Fig. 3 is the schematic configuration diagram of the wastewater treatment equipment 3 of third embodiment of the present invention.

The wastewater treatment equipment 3 of present embodiment, which has, produces acid tank 11, neutralization chamber 71, active sludge treatment slot 21, thallus addition Device 30, ammonia removing device 40, membrane module 52 (membrane separation device) and reserve tank 61.Neutralization chamber 71, which is arranged at, produces acid tank 11 Follow-up phase.Active sludge treatment slot 21 is arranged at the follow-up phase of neutralization chamber 71.Thallus adding set 30 and ammonia remove dress It sets 40 and is arranged at active sludge treatment slot 21 respectively.Membrane module 52 is arranged in active sludge treatment slot 21.Reserve tank 61 It is arranged at the follow-up phase of active sludge treatment slot 21.

(producing acid tank)

(neutralization chamber)

Neutralization chamber 71 is neutralized to from the production acid processing water for producing acid tank 11.

As described above, producing the suitable pH in acid processing is 5 or more, less than 8.On the other hand, aerobic direct nitrogen has been used Appropriate pH in the active sludge treatment of bacterium is 7~9, if the pH is too low, utilizes the ammonia nitrogen of aerobic direct nitrogen bacterium Nitrogen gasification result with regard to insufficient.Accordingly, with respect to the suitable pH in active sludge treatment, the pH for producing acid processing water is too low When, production acid processing water is neutralized in neutralization chamber 71, its pH is adjusted into the suitable pH into active sludge treatment In the range of.

Neutralization chamber 71 is connect with one end of the other end of second flow path 13 and the 6th flow path 72.The other end of 6th flow path 72 is connected It is connected to active sludge treatment slot 21.

In present embodiment, second flow path 13 are as follows: be supplied in follow-up phase for the production acid processing water that acid tank 11 generates will to be produced The flow path of neutralization chamber 71.

6th flow path 72 are as follows: for making the production acid processing water for being neutralized processing in neutralization chamber 71 as needed flow into follow-up phase The flow path of active sludge treatment slot 21.

In addition, neutralization chamber 71 is provided with pH determination part 74 in slot, sour addition portion 75, alkali addition portion 76.In addition, pH determination part in slot 74, sour addition portion 75 and alkali addition portion 76 are connected to control unit 77.

PH determination part 74, sour addition portion 75 and alkali addition portion 76 are the dresses for monitoring and controlling the pH in neutralization chamber 71 in slot It sets.

PH determination part 74 measures the pH of the production acid processing water in neutralization chamber 71 in slot.As pH determination part 74 in slot, can be used Various pH measurement devices.

Acid is added into neutralization chamber 71 in sour addition portion 75.Sour addition portion 75 has sour holding vessel 75a, acid supply flow path 75b and sets It is placed in the pump 75c of acid supply flow path 75b.75c is pumped by operating, during the acid (acid solution etc.) in sour holding vessel 75a is added into With slot 71.

Alkali is added into neutralization chamber 71 in alkali addition portion 76.Alkali addition portion 76 has alkali holding vessel 76a, alkali supply flow path 76b and sets It is placed in the 76c of alkali supply flow path 76b.76c is pumped by operating, the alkali (aqueous slkali etc.) in alkali holding vessel 76a is added into neutralization Slot 71.

Control unit 77 is configured to: according to the pH that pH determination part 74 is measured in slot, sour addition portion 75 and alkali addition portion 76 are controlled, So as to be preferably kept in the range of 7~9 in the range of the pH of the production acid processing water in neutralization chamber 71 maintains 6~9.

Control unit 77 can be the arithmetic processing apparatus such as having CPU.

Other than pH range is different, the operating of control unit 77 is same as the operating of control unit 17.

Alternatively, it is also possible to be not provided with control unit 77, and according to the pH that pH determination part 74 is measured in slot, manual switching pump 75c, The operating of 76c.

(active sludge treatment slot)

Other than replacing second flow path 13 and being connect with one end of the 6th flow path 72, the active sludge treatment slot of present embodiment 21 is identical as the active sludge treatment slot 21 of first embodiment.

(thallus adding set)

(ammonia removing device)

(membrane module)

(reserve tank)

In the wastewater treatment method for having used wastewater treatment equipment 3 as shown in Figure 3, firstly, making from the useless of the discharges such as pig farm Water flows into via first flow path 12 and produces acid tank 11.It is in advance maintained at acid-producing bacteria to produce in acid tank 11.Then, make to produce in acid tank 11 It maintains under anaerobic, waste water to be carried out to produce sour processing, becomes production acid processing water (producing acid treatment process).

Then, via second flow path 13, make to produce acid processing water from the production inflow neutralization chamber 71 of acid tank 11.Then, to production acid processing water It is neutralized (neutralization step).

Then, via the 6th flow path 72, so that the production acid for being neutralized processing is handled water and flow into active sludge treatment slot from neutralization chamber 71 21.Then, by thallus adding set 30, aerobic direct nitrogen bacterium is added into the acid of the production in active sludge treatment slot 21 It handles in water (thallus addition process).In addition, starting the air diffusion apparatus 22 in active sludge treatment slot 21, make to maintain in slot Under aerobic condition, active sludge treatment is carried out to acid processing water is produced, makes its water containing Treatment of Sludge (active sludge treatment process).

In active sludge treatment process, as noted previously, as stripping effect, thus a part of ammonia nitrogen is with the shape of gasiform ammonia Formula is dispersed out from sour handle is produced in water, by the gas containing the ammonia to disperse, passes through third flow path from active sludge treatment slot 21 41 and import ammonia remove equipment 42, ammonia remove equipment 42 in remove deammoniation (ammonia removal step of dispersing).Then, the gas that ammonia is removed Body is exhausted into atmosphere.

When separation of solid and liquid, by the way that air is imported membrane module 52 from air diffusion apparatus 22, to carry out membrane module by air washing The washing of 52 filter membrane surface, while activated sludge and biological treatment of water can be separated by solid-liquid separation well with efficiency.

The biological treatment of water (infiltration water) for having permeated the filter membrane of membrane module 52 is supplied into via the 4th flow path 53 from membrane module 52 Reserve tank 61 is simultaneously stored.

In the wastewater treatment equipment and wastewater treatment method of the third embodiment of present invention mentioned above, waste water is produced Acid processing, to the obtained active sludge treatment for producing acid processing water and used aerobic direct nitrogen bacterium, therefore, with First embodiment similarly, when active sludge treatment, even if not adding organic acid additionally, can also effectively make it is aerobic directly Nitrogen bacterium plays a role, and nitrogen removing is effectively performed.

Especially, it in present embodiment, before active sludge treatment, is neutralized to acid processing water is produced, it therefore, can be with Active sludge treatment is carried out at the appropriate ph, and nitrogen removal efficiency is more excellent.

In addition, separator used in solid-liquid separation treatment is to be set in active sludge treatment slot 21 in present embodiment Membrane module 52 (membrane separation device), therefore, aerobic direct nitrogen bacterium is difficult to flow out from active sludge treatment slot 21, can be with Sufficiently maintain the biomass in active sludge treatment slot.Therefore, aerobic direct nitrogen bacterium can be made more effectively to play work With nitrogen removal efficiency is more excellent.

In addition, removing the ammonia scattered from production acid processing powder-refining with water by ammonia removing device 40 in present embodiment.It therefore, can be with Ammonia nitrogen concentration increases caused by inhibiting the ammonia to disperse to be dissolved into production acid processing water again, and nitrogen removal efficiency is more excellent

Other embodiments

Wastewater treatment equipment and wastewater treatment method of the invention is not limited by above embodiment.

For example, aerobic direct nitrogen bacterium can be added into first flow path in first embodiment~third embodiment In 12 waste water flowed.In third embodiment, aerobic direct nitrogen bacterium can also be added into the production in neutralization chamber 71 In the acid processing water that acid processing water or the 6th flow path 72 are miscarried.

The organic acids such as acetic acid can be added to producing in acid processing water.Organic acid can may be salt form (sodium salt etc.) for acid type. But in the present invention, even if not adding organic acid, the nitrogen of the ammonia nitrogen using aerobic direct nitrogen bacterium can also be given full play to Gasification result.

Separator used in solid-liquid separation treatment is not defined as membrane separation device, or other than membrane separation device Separator.Subsider can be used for example instead of the membrane separation device 50 in second embodiment.It is aerobic directly from maintenance Preferred membrane separation device from the point of view of the bacteria concentration of nitrogen bacterium.

It, can be in the upper setting raw water reserve tank for producing acid tank 11, to waste water in first embodiment~third embodiment It carries out temporarily storing waste water before producing acid processing.By temporarily storing waste water before carrying out producing acid processing to waste water, so as to So that the fluctuation of raw water water or raw water quality homogenizes.

Embodiment

In the following, be described in more detail the present invention by embodiment, but the present invention is not limited to contents documented by it.

Examples 1 to 4, comparative example 1~2

Anaerobic Treatment water caused by Anaerobic Treatment (produce acid processing or methane fermentation is handled) using the waste water of manufacture enzyme (has The different 2 kinds of productions acid processing water of machine acid content and methane fermentation handle water), carry out following such research.

Evaluation is carried out using aerobic direct nitrogen bacterium under experimental condition as shown in Table 1 with following test methods The test of nitrogen removing performance.

Each experimental condition are as follows: change the type of the Anaerobic Treatment water as evaluation object, added for the presence or absence of Anaerobic Treatment water Sodium acetate (organic acid).

Organic acid content (total amount of propionic acid, butyric acid and acetic acid) in the Anaerobic Treatment water used, the content of ammonia nitrogen is respectively such as Shown in lower.

Produce acid processing water A: organic acid content 3800mg/L, the content 1000mg/L of ammonia nitrogen.

Produce acid processing water B: organic acid content 400mg/L, the content 1000mg/L of ammonia nitrogen.

Methane fermentation handles water: organic acid content 0mg/L, the content 1000mg/L of ammonia nitrogen.

(test method)

It takes Anaerobic Treatment water 350mL to be added in the conical flask of 1L, and adds aerobic direct nitrogen bacterium.According to experimental condition, And add sodium acetate.When adding sodium acetate (when carrying out the rear addition of organic acid), additive amount 2000mg/L.

Then, flask is shaken under conditions of 48 hours earthquake time, 25 DEG C of temperature, concussion speed 120rpm.As aerobic straight Nitrogen bacterium is connect, is added as recorded cultivated Bacillus foecalis alkaligenes No.4 in Japanese Patent Laid-Open 2002-199875 bulletin Bacterial strain (FERM P-21814).

After concussion in 48 hours, it regard the liquid (biological treatment of water) in flask as sample, is measured by following measuring methods Full nitrogen concentration.According to measurement result, full nitrogen (TN) removal rate is calculated by following formula.

TN removal rate (%)=(the full nitrogen concentration of full nitrogen concentration-biological treatment of water of Anaerobic Treatment water)

(measuring method of full nitrogen concentration)

Using being connected to total organic carbon analytical equipment (Mitsubishi of Co., Ltd. chemical analysis technology (Mitsubishi Chemical Analytech Co., Ltd.) system, " TOC-300V ") follow-up phase Nitrogen detector (Mitsubishi of Co., Ltd. chemical analysis skill Art system, " ND-210 type ") and measure full nitrogen concentration.The measuring method of the present apparatus is as (the decompression of oxygenolysis-chemoluminescence method Method).

Test result is as shown in table 1.

[table 1]

※ adds 2000mg/L

According to the comparison of the Examples 1 to 2 of the rear addition without organic acid and comparative example 1: being handled with to methane fermentation Water compared using the comparative example 1 of the processing of aerobic direct nitrogen bacterium, is carried out to acid processing water is produced using aerobic straight The available excellent nitrogen removing performance of Examples 1 to 2 for connecing the processing of nitrogen bacterium (utilizes aerobic direct nitrogen bacterium Ammonia nitrogen nitrogen gasification result).

Same tendency is also shown in the embodiment 3~4 for the rear addition for having carried out organic acid and the comparison of comparative example 2.

[industrial utilization possibility]

As described above, Anaerobic Treatment is carried out in the preposition stage, and carry out having used aerobic direct nitrogen in follow-up phase In the case where the wastewater treatment of the active sludge treatment of bacterium, in Anaerobic Treatment, reaction is not carried out until as Japan Patent is special The reaction of methane fermentation documented by 2014-50767 bulletin is opened, by carrying out reaction until organic matter is decomposed into organic acid Acid-producing, by the way that the organic acid for becoming the matrix of aerobic direct nitrogen bacterium to be supplied at the activated sludge of follow-up phase It manages in slot, the efficiency of aerobic direct nitrogen bacterium efficiency can be made to play a role well.

Therefore, documented by the Japanese Patent Laid-Open 2014-50767 bulletin compared with method, the present invention can make it is aerobic directly Nitrogen bacterium effectively plays a role, and biological respinse efficiency can also be made to improve.Further, previous first will can have been used The production acid tank of mainstream in alkane fermentation, the Anaerobic Treatment of the two-phase pattern processing unit of methane fermentation slot, which become being used only, produces acid tank One facies pattern processing unit can be handled, thus, it is possible to expect the densification of device, for improving aerobic direct nitrogen bacterium Active organic acid additive amount reduction and bring operating cost cut down effect.

Claims

1. a kind of wastewater treatment method, for waste water of the processing containing organic matter and containing at least one of organic nitrogen and ammonia nitrogen Method, which is characterized in that including following processes:

Carry out by the waste water organic matter generate organic acid production acid handle, and obtain organic acid content be 200mg/L with On production acid processing water process,

For the production acid processing water for producing acid processing and obtaining, active sludge treatment is carried out using aerobic direct nitrogen bacterium, The process for obtaining the water containing Treatment of Sludge containing biological treatment of water and activated sludge.

2. wastewater treatment method according to claim 1, wherein the pH for producing acid processing water is 5 or more, less than 8.

3. wastewater treatment method according to claim 2, wherein in the production acid processing, the pH of the waste water is controlled It makes 5 or more, less than 8.

4. wastewater treatment method described in any one of claim 1 to 3, wherein including following processes: using separation dress Set the process that solid-liquid separation treatment is carried out to the water containing Treatment of Sludge.

5. wastewater treatment method according to claim 4, wherein the separator is membrane separation device.

6. wastewater treatment method according to claim 5, wherein the membrane separation device, which is arranged at, carries out the activity In the active sludge treatment slot of Treatment of Sludge.

7. wastewater treatment method according to claim 5, wherein the membrane separation device, which is arranged at, carries out the activity The follow-up phase of the active sludge treatment slot of Treatment of Sludge.

8. wastewater treatment method according to claim 7, wherein including following processes: the membrane separation device point will be used From activated sludge a part process for sending the active sludge treatment slot back to from the membrane separation device.

9. wastewater treatment method described in any one of claim 1 to 3, wherein including following processes: described in obtaining After the process for producing acid processing water, to the process for producing acid processing water and being neutralized.

10. wastewater treatment method described in any one of claim 1 to 3, wherein including following processes: to the production The process of aerobic direct nitrogen bacterium is added in acid processing water.

11. wastewater treatment method described in any one of claim 1 to 3, wherein the aerobic direct nitrogen bacterium For Bacillus foecalis alkaligenes No.4 bacterial strain, that is, FERM P-21814.

12. a kind of wastewater treatment equipment, containing organic matter and contain the useless of at least one of organic nitrogen and ammonia nitrogen for processing The device of water, which is characterized in that the wastewater treatment equipment includes:

Produce acid tank: the production acid for generated by the organic matter in the waste water organic acid is handled, and makes its organic acid content be The production acid of 200mg/L or more handles water,

Active sludge treatment slot: activity is carried out to the production acid processing water that the production acid processing obtains with aerobic direct nitrogen bacterium Treatment of Sludge makes its water containing Treatment of Sludge containing biological treatment of water and activated sludge.

13. wastewater treatment equipment according to claim 12, wherein the pH for producing acid processing water is 5 or more, less than 8.

14. wastewater treatment equipment according to claim 13, wherein it is provided with pH determination part in slot in the production acid tank, Its pH for measuring the waste water in the production acid tank；Sour addition portion adds acid into the production acid tank；With alkali addition portion, to The production acid tank adds alkali,

The wastewater treatment equipment is constituted are as follows: according to the pH measured with pH determination part in the slot, is added into the production acid tank Acid or alkali, so as to which the pH of the waste water is adjusted to 5 or more, less than 8.

15. wastewater treatment equipment described in any one of 2~14 according to claim 1, wherein including containing Treatment of Sludge to described The separator of water progress solid-liquid separation treatment.

16. wastewater treatment equipment according to claim 15, wherein the separator is membrane separation device.

17. wastewater treatment equipment according to claim 16, wherein it is dirty that the membrane separation device is arranged at the activity In mud treatment trough.

18. wastewater treatment equipment according to claim 16, wherein it is dirty that the membrane separation device is arranged at the activity The follow-up phase of mud treatment trough.

19. wastewater treatment equipment according to claim 18, wherein send device back to including sludge, which will be described in A part of the activated sludge of membrane separation device separation sends the active sludge treatment slot back to from the membrane separation device.

20. wastewater treatment equipment described in any one of 2~14 according to claim 1, wherein in the subsequent stages for producing acid tank Section includes to the neutralization chamber for producing acid processing water and being neutralized.

21. wastewater treatment equipment described in any one of 2~14 according to claim 1, wherein including handling water to the production acid The thallus adding set of the middle aerobic direct nitrogen bacterium of addition.

22. wastewater treatment equipment described in any one of 2~14 according to claim 1, wherein the aerobic direct nitrogenization is thin Bacterium is Bacillus foecalis alkaligenes No.4 bacterial strain, that is, FERM P-21814.