CN100999359B - Waste water treatment method and device - Google Patents
Waste water treatment method and device Download PDFInfo
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- CN100999359B CN100999359B CN2006100058192A CN200610005819A CN100999359B CN 100999359 B CN100999359 B CN 100999359B CN 2006100058192 A CN2006100058192 A CN 2006100058192A CN 200610005819 A CN200610005819 A CN 200610005819A CN 100999359 B CN100999359 B CN 100999359B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
This invention provides a processing method of organic waste, which includes following processes: (1). mix electron acceptor solution which has generated at least nitrate and sulphate about microbiology in untreated water of waste water, first aerating process, which aerates in condition that dissolved oxygen content is 1mg/L or less than 1mg/L, oxidation reduction potential is 300mV or lower than 300mV. (2). Precipitating and separating process, which is used to separate processing water of above first aerating process to sediment mud and clear supernatant liquid. (3). Second aerating process, which aerates separated sediment mud of above precipitating and separating process, in condition that dissolved oxygen content is 1mg/L or less than 1mg/L, oxidation reduction potential is 300mV or lower than 300mV. (4). Process, which uses processed water of above second aerating process as electron acceptor solution, which is send to first aerating process.
Description
Technical field
The present invention relates on microbiology to purify effectively contain WWT, organic waste water such as moisture garbage decomposition processing, odorless and few treatment process and the treatment unit of excess sludge are simultaneously handled, contained to the animal fecaluria.
Background technology
For containing trade effluent, sanitary wastewater, animal fecaluria, containing the processing of organic industrial wastes such as moisture rubbish and domestic refuse, a lot of methods have been proposed all the time, as its representative method, known have an activated sludge method.But this method is under the environment of high-solubility oxygen amount (DO), and the aerobic respiration through the aerobism mikrobe is carried out the method for oxygenolysis with organism, and problems such as producing a large amount of excess sludges and sewage stench is arranged.In addition, the also known decomposing process that has under anaerobic, but, therefore problems such as the extreme of generation stench are arranged owing to generate tunning and hydrogen sulfide etc. in large quantities.
Thus; The present inventor is conceived to the electron acceptor(EA) as the breathing factor of the micropopulation of decomposing organic matter; Developed when the amount with dissolved oxygen is controlled at trace; The supernatant of the final aeration treatment process that contains electron acceptor(EA) galore is returned to the system that waste water flows into operation, the volume and the odorlessization in the entire treatment operation (No. 3667254 communique of japanese) of successfully having accomplished to reduce significantly excess sludge.In addition; The micropopulation that also symbiosis in the presence of the electron acceptor(EA) beyond little oxygen amount and the oxygen is bred; Study with the organism decomposition course that causes by these micropopulations, and proposed it and effectively utilize method (japanese application open 2004-248618 communique).
Summary of the invention
The present invention has further continued above-mentioned novel organic waste Study on Processing Methods and the invention that proposes; Its purpose be to be conceived to as micropopulation breathe the factor electron acceptor(EA) concentration and as the cognation between the redox potential of a reason of regulation micropopulation growing environment; Through they being controlled in the suitable scope; Even the condition of the organic waste of handling changes, also can promote effective and stable organism to decompose and suppress malodorous generation.
Another object of the present invention is to through carrying out by being that the main caused organism of micropopulation decomposes with the nitrate respiration, thereby reduce the amount that produces mud significantly.
Method of wastewater treatment of the present invention is characterized in that containing the operation of following (1)～(4):
(1) in the former water of waste water, sneaks into and on microbiology, to have generated the electron acceptor(EA) solution of nitrate salt and vitriol at least, and be that 1mg/L or following and redox potential are the first aeration operation of carrying out aeration under 300mV or the following condition at dissolved oxygen content.
(2) be used for the treating water of the above-mentioned first aeration operation is separated into the precipitate and separate treatment process of precipitating sludge and supernatant.
(3) be that 1mg/L or following and redox potential are under 300mV or the following condition at dissolved oxygen content, will be in above-mentioned precipitate and separate treatment process separated precipitating sludge carry out once more the second aeration operation of aeration.
(4) will be returned to the operation of the above-mentioned first aeration operation at the treating water in the above-mentioned second aeration operation as electron acceptor(EA) solution.
The characteristic of method of wastewater treatment of the present invention is that also above-mentioned electron acceptor(EA) solution contains the nitrate salt of 5～500mg/L and the vitriol of 5～700mg/L.
The characteristic of method of wastewater treatment of the present invention is that also above-mentioned electron acceptor(EA) solution contains the nitrate salt of 5～100mg/L and the vitriol of 5～100mg/L, and redox potential is 0mV～300mV.
Wastewater treatment equipment of the present invention is characterised in that to possess following apparatus:
In the former water of waste water, sneak into and on microbiology, to have generated the electron acceptor(EA) solution of nitrate salt and vitriol at least, and dissolved oxygen content be 1mg/L or following and redox potential be first aerator tank that carries out aeration under 300mV or the following condition,
Be used for being separated at the treating water that above-mentioned first aerator tank is processed precipitating sludge and supernatant the precipitate and separate treatment trough,
With the same condition of above-mentioned first aerator tank under, will be in above-mentioned precipitate and separate treatment trough separated precipitating sludge carry out once more aeration second aerator tank,
The supernatant that will in above-mentioned second aerator tank, be processed is returned to the device of above-mentioned first aerator tank as electron acceptor(EA) solution.
The characteristic of wastewater treatment equipment of the present invention also is:
The oxygen supply amount control device that it possesses the dissolved oxygen concentration determinator that is arranged in above-mentioned first aerator tank and above-mentioned second aerator tank and oxidation reduction potential determination device and the oxygen supply amount of above-mentioned first aerator tank and second aerator tank is controlled; Wherein, Above-mentioned oxygen supply amount control device has the output information according to above-mentioned dissolved oxygen concentration determinator and oxidation reduction potential determination device, reaches 1mg/L or following and redox potential according to the dissolved oxygen content of above-mentioned first and second aerating apparatuss and reaches the device that 300mV or following mode are controlled the oxygen supply amount.
The characteristic of wastewater treatment equipment of the present invention also is:
The foldback amount control device that it possesses the electron acceptor(EA) solution concentration measurer that is arranged in above-mentioned first aerator tank and the supernatant of above-mentioned second aerator tank is returned to above-mentioned first aerator tank; Wherein, Above-mentioned foldback amount control device has according to coming from the output information of above-mentioned electron acceptor(EA) solution concentration measurer, and the mode that reaches set(ting)value according to the electron acceptor(EA) strength of solution in above-mentioned first aerator tank is returned to the supernatant of above-mentioned second aerator tank gear of above-mentioned first aerator tank.
So-called electron acceptor(EA) solution is meant the inorganic solution that contains the oxygen that is accompanied by the necessary breathing factor of organic decomposition that consumes as the energy with mikrobe, nitrate salt, vitriol among the present invention, in addition, also contains chemical substances such as iron, manganese.Oxygen is consumed by preferential as the preferred factor of breathing, if its amount surpasses 1mg/L, then becomes so-called activated sludge method, aerobism micropopulation propagation.Dissolved oxygen can be to mean micropopulation with 0 of the state of oxygen depletion, but as the breathing factor of micropopulation minimum, preferably surpasses the oxygen amount of 0.1mg/L.Also contain the part that except application target, also is used for other thalline oxidation (for example nitric acid is microbial nitrated) in the oxygen amount as electron acceptor(EA) solution.
If dissolved oxygen reaches about 0.1mg/L, then micropopulation begins to consume the breathing factor of oxygen instead and the nitrate salt and the vitriol of final electron acceptor(EA).In turn consume the high nitrate salt of redox potential, then the consume sulfur hydrochlorate.Then, carry out denitrogenation through the bacterium that carries out nitrate respiration in the micropopulation, and the generation hydrogen sulfide such as sulfatereducting bacteria through carrying out sulfate respiration.Hydrogen sulfide is one of malodorous reason, but among the present invention in all be as the symbiosis flora nitrate respiration active hydrogen sulfide generation seldom.Material for producing through hydrogen sulfide being oxidizing to the effect of vitriolic sulfur oxidizing bacterium, can maintain the odorless state.
If nitrate salt and vitriol are 5mg/L or when following, then can not promote the nitrate respiration and the sulfate respiration that cause by this micropopulation effectively.On the contrary, if nitrate salt reach 500mg/L or above and vitriol reach 700mg/L or more than, then mikrobe is because these materials and passivation.Preferably nitrate salt and vitriol maintain 5～100mg/L.
Redox potential is to be used for the oxygen (dissolved oxygen), nitrate salt, the vitriol that constitute above-mentioned electron acceptor(EA) are maintained the index that also constitutes with the nitrate respiration micropopulation (symbiosis flora) that is the master in the above-mentioned scope.Redox potential is 0mV or when following, as the hypoxgia of electron acceptor(EA), the balance of micropopulation uses the direction of bacterium to tilt to sulphur compound.And at 300mV or when above, because as the hyperoxia of electron acceptor(EA), so the balance of micropopulation is used the direction of bacterium tilt (becoming active sludge) to oxygen.
Redox potential can be adjusted through the electron acceptor(EA) of adjusting oxygen supply amount, input regulation, the damping fluid (wastewater treatment medium etc.) that drops into the redox potential with regulation etc.
Description of drawings
Fig. 1 is the sketch chart of the wastewater treatment equipment of demonstration embodiments of the invention.
Fig. 2 is the sketch chart of the wastewater treatment equipment of demonstration other embodiments of the invention.
Nomenclature
1 is that first aerator tank, 2 is that precipitate and separate treatment trough, 3 is that second aerator tank, 4 is that the former water of waste water, 5 is that electron acceptor(EA) solution service, 6 is that oxygen supply pipeline, 10 is that oxygen supply amount control device, 11 is that dissolved oxygen concentration determinator, 12 is that valve, 13 is that oxidation reduction potential determination device, 14 is that electron acceptor(EA) solution foldback gear, 15 is that electron acceptor(EA) solution concentration measurer, 16 is that valve, 20 is that inflow groove, 21 stays groove for electron acceptor(EA) solution holds
Embodiment
Below, according to accompanying drawing embodiment of the present invention is described.
The sketch chart of the sludge treatment equipment that Fig. 1 has the most simply changed for the present invention, 1 for first aerator tank that becomes reactive tank, 2 for precipitate and separate treatment trough, 3 for becoming second aerator tank of sludge digestion tank.
When the former water 4 of waste water such as sanitary wastewater, trade effluent, animal fecaluria water flows in first aerator tank 1, of the back, supply with electron acceptor(EA) solution from second aerator tank 3 via electron acceptor(EA) solution service 5.From the internal feed oxygen of oxygen supply pipeline 6 to first aerator tank 1, the dissolved oxygen content in first aerator tank 1 is that 1mg/L or following and redox potential are under 300mV or the following condition, carries out little aeration of specified time (a couple of days).
Through carrying out little aeration under the condition like this, in first aerator tank 1, micropopulation replaces oxygen, the nitrate salt that contains in the electron acceptor(EA) solution, vitriol etc. is used as breathing the factor, thereby the organism in the waste water is carried out digest and decompose.Then as stated, carry out denitrogenation through the bacterium that carries out nitrate respiration in the micropopulation.
Then, the treating water of first aerator tank 1 is transferred in the precipitate and separate treatment trough 2, through treating water being left standstill the specified time (fate), makes the sludge settling that contains in the treating water, thereby separates with supernatant.
In precipitate and separate treatment trough 2, phosphorus absorbs microorganism active propagation and phosphorus is absorbed (dephosphorization), thereby the phosphorus composition of supernatant reduces.
The part of the mud of precipitate and separate treatment trough 2 is returned in first aerator tank 1 as required, is used for the microorganism concn adjustment of first aerator tank 1.Remaining precipitating sludge is transferred in second aerator tank 3.After the supernatant of precipitate and separate treatment trough 2 carried out sterilising treatment as required, release 7 to rivers and creeks etc.
To the inside of second aerator tank 3, supply with oxygen from oxygen supply pipeline 6, be that 1mg/L or following and redox potential are that the excess sludge that will from precipitate and separate treatment trough 2, be transferred carries out little aeration under 300mV or the following condition at dissolved oxygen content.Reduce the volume of excess sludge thus.In this second aerator tank 3, generated the electron acceptor(EA) solution of mineral compound such as containing nitrate salt, vitriol, phosphoric acid salt, sulphur compound, iron, manganese, and the electron acceptor(EA) solution of specified amount has been supplied in first aerator tank 1.Here, it is that 5～500mg/L, vitriol are 5～700mg/L that the electron acceptor(EA) solution that on microbiology, is generated maintains nitrate salt.
Oxygen supply amount to first aerator tank 1 and second aerator tank 3 is to control through oxygen supply amount control device 10.In oxygen supply amount control device 10; Dissolved oxygen concentration determinator 11 from be arranged on first aerator tank 1 and second aerator tank 3; 11 input dissolved oxygen concentration measured signals, and from oxidation reduction potential determination device 13,13 input oxidation reduction potential determination signals.Then, the dissolved oxygen content according to the treating water of first aerator tank 1 and second aerator tank 3 reaches the stream switch signal that 1mg/L or following (set(ting)value) and redox potential reach the mode output valve 12,12 of 300mV or following (redox potential set(ting)value).The adjusting of redox potential can be through the electron acceptor(EA) solution stated after regulating the foldback amount, carry out from the feed rate of the precipitating sludge of precipitate and separate treatment trough 2.
The electron acceptor(EA) solution of second aerator tank 3 is to control through electron acceptor(EA) solution foldback gear 14 to the foldback amount of first aerator tank 1.Electron acceptor(EA) solution concentration measurer 15 from be arranged on first aerator tank 1 is imported electron acceptor(EA) strength of solution such as nitrate salt, vitriol in electron acceptor(EA) solution foldback gear 14, according to the stream switch signal of the mode output valve 16 of the setting concentration value that reaches above-mentioned each composition.
Shown in Figure 2 is other embodiments of the invention.In the embodiment of Fig. 1, the former water of waste water flow in first aerator tank 1, but in the embodiment of Fig. 2, is provided with inflow groove 20 in the front of first aerator tank 1, and former this inflow groove 20 of water 4 inflows of waste water is transferred in first aerator tank 1 after also temporarily holding and staying.Through such inflow groove 20 is set, in the inflow adjustment of the former water of waste water that carries out changing constantly, also can carry out pre-treatments such as purifying treatment.And, through to this inflow groove 20, supplying with oxygen, and reach 1mg/L or following mode is carried out little aeration, and carry out the pre-treatment of first aerator tank 1, the former water of waste water that treatments B OD concentration is high effectively according to dissolved oxygen content from oxygen supply pipeline 6.
In the embodiment of Fig. 2, the electron acceptor(EA) solution of second aerator tank 3 temporarily held stay electron acceptor(EA) solution and hold and stay in the groove 21, electron acceptor(EA) solution is returned to hold from this electron acceptor(EA) solution stay groove 21 to deliver to flow into the groove 20.Like this, can stablize electronics receptor solution and being supplied to flows in the groove 20.
Above-mentioned embodiment is an example of the present invention, for example can also with hold the lower sediment of staying groove 21 at electron acceptor(EA) solution shown in Figure 2 small amount of residual mud be back in second aerator tank 3 and carry out digestion process once more.And electron acceptor(EA) solution holds and stays groove 21 can also be arranged on the front that flows into groove 20.
Also can handle even the BOD of the present invention in flowing into groove 20 is 10000mg/L or above, can treatments B OD be the general waste water about 200mg/L also.
According to the invention described above; Through in the disaggregating treatment of organic waste; The concentration and the redox potential of electron acceptor(EA) are maintained in the specialized range,, also can access effective and stable decomposition course even the condition (for example BOD, COD) of the organic waste of handling changes; Therefore organic decomposition is accelerated, and also can not produce stench.Owing to, therefore can reduce the amount that produces mud significantly through being that main micropopulation carries out the organism decomposition with the nitrate respiration.
Embodiment
Embodiment 1
With on average flowing into the organism amount is that the sanitary wastewater of 100mg/L is handled by following condition.Treatment unit is a structure shown in Figure 2.Its result is shown in table 1.The measured value of nitrate salt, vitriol, oxygen amount and redox potential is shown in table 2 in first aerator tank of this moment.
Table 1
| Water quality treatment | Flow into water | Treating water | The sludge digestion tank supernatant water |
| pH | 7.3 | 7.7 | 4.8 |
| SS(mg/L) | 74.4 | 5.2 | 5.7 |
| COD(mg/L) | 83.4 | 7.3 | 46.6 |
| BOD(mg/L) | 146 | 4.3 | 5.8 |
| N-Hex | 9.8 | Less than 1.0 | Less than 1.0 |
| T-P(mg/L) | 4.8 | 2.2 | 28 |
| NH 4-N(mg/L) | 21.2 | 0.51 | 2.88 |
| NO 3-N(mg/L) | Less than 0.10 | 11.1 | 97.3 |
| SO 4-S(mg/L) | Undetermined | 34.2 | 176 |
Table 2
| pH | 7.7 |
| ORP?mV | 275 |
| DO?mg/L | 0.2 |
| Nitric acid mg/L | 11.1 |
| Sulfuric acid mg/L | 34.2 |
Through the treatment unit identical, be that the moisture rubbish that contains of 1000mg/L is handled according to following condition with on average flowing into the organism amount with embodiment 1.Its result is shown in table 3.The measured value of nitrate salt, vitriol, oxygen amount and redox potential is as shown in table 4 in first aerator tank.
Table 3
| Water quality treatment | Flow into water | Treating water | The sludge digestion tank supernatant water |
| pH | 4.7 | 7.3 | 7.5 |
| SS(mg/L) | 862 | 4.9 | 2.3 |
| COD(mg/L) | 972 | 19.8 | 24.6 |
| BOD(mg/L) | 1006 | 5.7 | 3.6 |
| N-Hex | 246 | Less than 1.0 | Less than 1.0 |
| T-P(mg/L) | 9.66 | 0.41 | 1.56 |
| NH 4-N(mg/L) | 5.74 | 0.33 | 1.27 |
| NO 3-N(mg/L) | Less than 0.10 | 0.1 | 4.41 |
| SO 4-S(mg/L) | 11.58 | 33.1 | 33.0 |
Table 4
| pH | 6.85 |
| ORPmV | 220 |
| DOmg/L | 0.1 |
| Nitric acid mg/L | 4.41 |
| Sulfuric acid mg/L | 33.0 |
Can know that by above embodiment according to the present invention, compare with flowing into water (waste water before handling), the water quality of treating water is purified significantly.And almost there is not stench.In addition, contain nitrate salt and vitriol in the supernatant water of sludge digestion tank in right amount, be the good solution that contains electron acceptor(EA).
Claims (4)
1. one kind contains organic wastewater treatment method, it is characterized in that, contains the operation of following (1)～(4):
(1) in the former water of waste water, sneaks into the electron acceptor(EA) solution of the vitriol of the nitrate salt that contains the 5～100mg/L that on microbiology, generates and 5～100mg/L, and be to be the first aeration operation of carrying out aeration under the condition of 0mV～300mV with redox potential below the 1mg/L at dissolved oxygen content;
(2) be used for the treating water of the said first aeration operation is separated into the precipitate and separate treatment process of precipitating sludge and supernatant;
(3) be to be under the condition of 0mV～300mV with redox potential below the 1mg/L at dissolved oxygen content, will be in said precipitate and separate treatment process separated precipitating sludge carry out once more the second aeration operation of aeration;
(4) will be returned to the operation of the said first aeration operation at the treating water in the said second aeration operation as electron acceptor(EA) solution.
2. disposal plant that contains organic waste water is characterized in that possessing following apparatus:
In the former water of waste water, sneak into the electron acceptor(EA) solution of the vitriol of the nitrate salt that contains the 5～100mg/L that on microbiology, generates and 5～100mg/L, and be to be first aerator tank that carries out aeration under the condition of 0mV～300mV with redox potential below the 1mg/L at dissolved oxygen content;
Be used for to be separated at the treating water that said first aerator tank is processed the precipitate and separate treatment trough of precipitating sludge and supernatant;
With the same condition of said first aerator tank under, will be in said precipitate and separate treatment trough separated precipitating sludge carry out once more second aerator tank of aeration;
The supernatant that will in said second aerator tank, be processed is returned to the device of said first aerator tank as electron acceptor(EA) solution.
3. wastewater treatment equipment as claimed in claim 2; It is characterized in that; The oxygen supply amount control device that possesses the dissolved oxygen concentration determinator that is arranged in said first aerator tank and said second aerator tank and oxidation reduction potential determination device and the oxygen supply amount of said first aerator tank and second aerator tank is controlled; Wherein, Said oxygen supply amount control device has the output information according to said dissolved oxygen concentration determinator and oxidation reduction potential determination device, reaches below the 1mg/L device that the mode that reaches 0mV～300mV with redox potential is controlled the oxygen supply amount according to the dissolved oxygen content of said first and second aerating apparatuss.
4. like claim 2 or 3 described wastewater treatment equipments; It is characterized in that; Possess the electron acceptor(EA) solution concentration measurer that is arranged in said first aerator tank and the supernatant of said second aerator tank is returned to the foldback amount control device of said first aerator tank; Wherein, Said foldback amount control device has according to coming from the output information of said electron acceptor(EA) solution concentration measurer, and the mode that reaches set(ting)value according to the electron acceptor(EA) strength of solution in said first aerator tank is returned to the supernatant of said second aerator tank gear of said first aerator tank.
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Citations (4)
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|---|---|---|---|---|
| CN1387099A (en) * | 2002-06-14 | 2002-12-25 | 彭永臻 | Method and device for fuzzy control of SBR process |
| US6527956B1 (en) * | 1998-06-02 | 2003-03-04 | Suez Lyonnaise Des Eaux | Method for regulating aeration during waste water biological treatment |
| CN1461733A (en) * | 2002-05-31 | 2003-12-17 | 周楚洋 | Dynamic control method for actirated sludge process |
| EP1144318B1 (en) * | 1998-12-23 | 2005-11-16 | Otv Sa | Method for treating an effluent using simultaneous nitrification/denitrification in a trickling filter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6527956B1 (en) * | 1998-06-02 | 2003-03-04 | Suez Lyonnaise Des Eaux | Method for regulating aeration during waste water biological treatment |
| EP1144318B1 (en) * | 1998-12-23 | 2005-11-16 | Otv Sa | Method for treating an effluent using simultaneous nitrification/denitrification in a trickling filter |
| CN1461733A (en) * | 2002-05-31 | 2003-12-17 | 周楚洋 | Dynamic control method for actirated sludge process |
| CN1387099A (en) * | 2002-06-14 | 2002-12-25 | 彭永臻 | Method and device for fuzzy control of SBR process |
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