CN100460341C - Biological sewage-treating process - Google Patents
Biological sewage-treating process Download PDFInfo
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- CN100460341C CN100460341C CNB2007100150672A CN200710015067A CN100460341C CN 100460341 C CN100460341 C CN 100460341C CN B2007100150672 A CNB2007100150672 A CN B2007100150672A CN 200710015067 A CN200710015067 A CN 200710015067A CN 100460341 C CN100460341 C CN 100460341C
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Abstract
The biological sewage-treating process includes the first SBR reactor operation stage and the subsequent BAF reactor operation stage. The SBR reactor operation stage to eliminate organic matter and total phosphorous includes the steps of feeding water, reaction, deposition, draining sludge and draining water, and the outgoing water of the SBR reactor is fed to the BAF reactor through one intermediate water tank and pipeline. The BAF reactor operation stage to eliminate total nitrogen includes the steps of denitrifying and nitrifying. The biological sewage-treating process has separate effective elimination of total phosphorous and total nitrogen, effective control of sludge expansion, and capacity of obtaining high and stable outgoing water quality.
Description
Technical field
The present invention relates to a kind of sewage disposal technology, particularly relate to a kind of recombining process that utilizes sequencing batch active sludge and BAF coupling that sewage is handled, is a kind of biological method for treating waste water specifically.
Background technology
Known biologic process for treating sewage is pressed the existence form of microorganism in the reactor, can be divided into the suspended sludge treatment process and adhere to sludge treatment technique two big classes.Adhere to sludge treatment technique owing to its constructional feature, biological phosphor-removing effect is not good, therefore enters nitrogen, phosphorus nutrition salt after the removal stage, and most widely used in actual engineering is the suspended sludge treatment process.
Sequencing batch active sludge (sequencing batch reactor, SBR, also be translated into intermittent activated sludge process) be a kind of of suspended sludge treatment process, generally can be divided into water-filling phase, reaction period, precipitation phase, draining spoil disposal phase and five stages of lay-up period by the operation order, a cycle of operation of these five stage composition SBR technologies, also can not establish lay-up period according to the operation needs.The most tangible characteristics of this technology are reaction and sedimentary two procedures to be placed on the sequence intermittent type carries out in the same reactor, enlarged the function of reactor, therefore need not establish second pond and mud backflow facility in addition, construction investment and working cost all are lower than traditional continous way suspended sludge technology.But because the ecosystem that this technology still tries hard to use various microorganisms compositions reaches the purpose of removing organism and nutritive salt under different reaction conditionss.And because the different microorganism mixed growth in same system of function, especially the generation cycle long autotrophy nitrifier and the mixed growth of heterotrophic bacterium, exist contradiction, the denitrification in mud between nitrifier and polyP bacteria age inevitably and release the phosphorus process nitrate composition in the competition of carbon source and the returned sluge is released the inherent defective of systems such as influence of phosphorus own to anaerobic zone, make system often be difficult to reach the effect of synchronous high-efficiency dephosphorization and denitrogenation.
In the face of these problems that the suspended sludge treatment process exists, for adapting to the requirement of reuse of wastewater, BAF (Biological Aerated Filer, BAF) just arise at the historic moment, and obtained swift and violent development by technology simultaneously.BAF has fully been used for reference the mentality of designing in sewage disposal contact oxidation method and the quick filter tank of feedwater, has that collection biological degradation and filtration are retained in one, do not have the sludge bulking problem, floor space is little, effluent quality can reach advantages such as reuse standard.But also there is following defective in traditional BAF:
(1) the water inlet suspended substance stops up more easily, and the cycle of operation is short, and back flushing is frequent.Handle higher organic loading and have the function of holding back suspended substance in short hydraulic detention time for reaching, the packing material size that BAF adopts is generally all smaller.If the suspended substance of water inlet is higher, can make the filter tank in very short time, reach the head loss of design and stop up, so just must cause frequent back flushing, increased working cost with manage inconvenient.So just higher requirement has been proposed the treatment process before the BAF.
When (2) entering organic matter of water concentration was high, feed-water end heterotrophic bacterium propagation was too fast, can cause the cycle of operation short equally, and back flushing is frequent.
(3) biological phosphor-removing effect is bad, relies on the chemical method dephosphorization.General Study is thought, does not have the alternate environment of anaerobic and aerobic in BAF, is a spot of phosphorus of microorganism self growth needs in the filter tank, so the biological phosphate-eliminating effect is very weak.For making water outlet reach emission standard, be aided with chemical dephosphorization to solve the problem up to standard of phosphorus more.Thereby cause sludge yield big, and compare with biological sludge, chemical sludge is difficult to handle and dispose more.
(4) denitrifying capacity deficiency only the ammonia nitrogen oxidation, no doubt can not reproduce into the black smelly problem of water body, but It dones't help the situation to eutrophication problem.
Though use the patent documentation that sequencing batch active sludges and BAF are carried out sewage disposal both at home and abroad for existing several, be that 97116662 " intermittent aeration sequencing batch active sludge sewage treatment process and system continuously ", the patent No. are that 200610018502 " waste water treating process of circulation sequence batched active sludge and activated sludge reactor thereof " and the patent No. are 02129618 " double-layer filter material aerating biological filter " as the patent No..But above-mentioned sequencing batch active sludge technology all fails to solve critical problems such as a series of contradictions, sludge bulking of denitrogenation and dephosphorization requirement; Above-mentioned biological aerated filter process also fail solve to need frequent back flushing, nitrogen removal rate low, rely on critical problem such as chemical dephosphorization.
Summary of the invention
The objective of the invention is to the defective and the deficiency that exist separately at sequencing batch active sludge and BAF, a kind of biological method for treating waste water is provided, avoid interfering with each other of denitrogenation and dephosphorization, assurance is to the removal of total nitrogen, total phosphorus, and can control the generation of sludge bulking effectively, can obtain effluent quality good, stably reaching standard.
For realizing purpose of the present invention, the present invention is achieved by the following technical solutions: a kind of biological method for treating waste water, comprise sbr reactor device working stage and BAF reactor working stage, it is characterized in that: carry out the removal of organism and total phosphorus earlier in the sbr reactor device, this stage comprises following steps:
(1) water inlet: pretreated former water enters the sbr reactor device, stops during to the predetermined fluid level or the scheduled time;
(2) reaction: under mechanical stirring, the suspended sludge thorough mixing in water inlet and the sbr reactor device is under anaerobic finished anaerobic phosphorus release, follows the ammonification of organonitrogen and the cracking of larger molecular organics simultaneously; Stop after the mechanical stirring sbr reactor device micro-pore aeration is finished aerobic suction phosphorus and most of organic biological degradation;
(3) precipitation: stop aeration, mixed solution is quiescent setting in the sbr reactor device;
(4) spoil disposal: the rich phosphorus excess sludge of discharging after precipitation is finished, phosphorus is removed from system, and kept the activity of suspended sludge;
(5) draining: supernatant liquor is entered an intermediate water tank;
Then, carry out the removal of total nitrogen in the BAF reactor, this stage comprises following steps:
(1) denitrification: the BAF reactor will enter the BAF reactor from the BAF bottom and carry out denitrification from the water inlet of intermediate water tank with after its inner phegma mixes, simultaneously the further organism in the degradation of sewage;
(2) nitrated: as on the top of BAF reactor the ammonia nitrogen in the water inlet to be carried out nitratedly, be back to feed-water end by the internal reflux pipeline then, remove the total nitrogen in the system.
Above-mentioned sbr reactor device only comprises two step of reaction of anaerobic and aerobic, and aerobic section finishes till the organic degraded, does not carry out nitrated.The anaerobism section reaction times is 0.5～1.5 hour, and the aerobic section reaction times is 2～4 hours.
Comprise the anoxic section of bottom and the aerobic section on top in the BAF reactor, the anoxic section is carried out denitrification, and the order of occurrence from nitration reaction, anti-nitration reaction belongs to Prepositive denitrification.
For prolonging backwashing period, the particle diameter of filter medium that the particle diameter of filter medium that the anoxic section adopts in the described BAF reactor adopts greater than aerobic section.Wherein, it is the filtrate of 5～6mm that the anoxic section adopts particle diameter, and it is the filtrate of 3～5mm that aerobic section adopts particle diameter.
Filtrate can adopt haydite, zeolite, shale, volcanics, coke, gac, polystyrene etc.; Anoxic section and aerobic section can adopt the filtrate of identical type, also can be kind two kinds of filtrates inequality.
Aeration head is arranged at the boundary of two kinds of particle diameter filtrates, realizes not aeration of BAF reactor lower part, is the anoxic section; The top aeration is aerobic section.
As another program of the present invention,, can adopt the parallel running of a plurality of sbr reactor device for realizing the continuous water inlet and the water outlet of total system.
Compared with prior art, advantage of the present invention and positively effect are:
(1) compare with existing suspended sludge technology, the sbr reactor device of this technology has only kept aerobic section and anaerobism section, has rejected the anoxic section that easily causes sludge bulking, has avoided the generation of sludge bulking, makes operational management simple.Simultaneously, avoided of the influence of the nitrate of anoxic section generation, thereby helped aerobic suction phosphorus, improved phosphor-removing effect anaerobic phosphorus release.
(2) the sbr reactor device needn't be considered nitratedly, and load can increase substantially, and reactor volume is reduced, thereby reduced floor space.
(3) sbr reactor device anti impulsion load ability is strong, makes its water outlet (be BAF water inlet) water conditioning, helps poor growth, to the propagation of the nitrifier of reaction conditions sensitivity.
(4) the sbr reactor device has been removed most suspended substances and organism in the former water, has alleviated the obstruction of BAF reactor, has prolonged backwashing period greatly, has reduced operation energy consumption, has improved producing water ratio.
(5) to utilize the BAF reactor to carry out nitrated, realized separating of hydraulic detention time and solid retention time, under the short hydraulic detention time, mud age can be very long, makes long nitrifier enrichment of generation cycle, nitratedly speeds up, reactor ammonia nitrogen loading height also can reduce floor space simultaneously.
(6) be different from traditional BAF, adopted the bigger filtrate of particle diameter in the Prepositive denitrification section that the present invention sets up, this has not only guaranteed nitrogen removal rate, and has prolonged backwashing period.
(7) filtering function of BAF has guaranteed further the holding back of suspended substance, and has also further reduced simultaneously the phosphorus that water suspension carries.
Description of drawings
Fig. 1 is the process flow sheet of a kind of biological method for treating waste water of the present invention.
Among Fig. 1,1, water inlet pipe; 2, sbr reactor device; 3, agitator; 4, blast main; 5, SBR shore pipe; 6, SBR rising pipe; 7, intermediate water tank; 8, air compressor machine; 9, BAF reactor; 10, internal recycle water pipe; 11, water pump; 12, rising pipe; 13, back flushing water pipe; 14, aeration head; 15, aeration head; 16,17,18,19,20,21 magnetic valves.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The main water-quality guideline of former water is: CODcr=500～800mg/L, BOD
5=300～400mg/L, SS=150～450mg/L, TN=50～90mg/L, TP=7～11mg/L.Above-mentioned former water conservancy is handled with sewage treatment process of the present invention.
Waste disposal plant comprises sbr reactor device and BAF reactor, is provided with intermediate water tank between two reactors, and intermediate water tank is connected with two reactors by pipeline.At first the magnetic valve 16 on the water inlet pipe 1 is opened, and enters sbr reactor device 2 through pretreated former water through water inlet pipe 1.Entering water electromagnetic valve 16 is closed after reaching predetermined water level, and agitator 3 is opened.Sewage after mechanical stirring with the sbr reactor device in the active sludge thorough mixing, MLSS is 3500～4000mg/L, carries out 1.0 hours anaerobic reaction, polyP bacteria is finished anaerobic phosphorus release, follows the ammonification of organonitrogen and the cracking of larger molecular organics simultaneously.After anaerobic reaction finished, agitator 3 cut out, and the magnetic valve 17 on the SBR blast main 4 is opened, and carries out 2.5 hours aerobic reaction, finishes organic degraded and aerobic suction phosphorus.After aerobic reaction finished, magnetic valve 17 cut out, and enters 0.5 hour quiescent setting stage.After precipitation finished, the magnetic valve 18 on the SBR shore pipe 5 was opened, and the rich phosphorus excess sludge of discharge unit keeps the activity of mud in the sbr reactor device, and phosphorus is discharged from reactor.Magnetic valve 18 cuts out then, and the magnetic valve 19 on the SBR rising pipe 6 is opened, and supernatant liquor enters intermediate water tank 7.
After BAF reactor operation for some time, along with increasing of the suspended substance that dams, and the growth of microorganism makes the microbial film thickening, and part aged microbial film comes off from filtrate, goes out water suspension and increases, the removal decrease in efficiency of reactor.Should carry out back flushing to the BAF reactor this moment according to the working time of setting or the head loss of BAF reactor.Magnetic valve 20 on the BAF reactor water inlet pipe cuts out, and the magnetic valve 21 of back flushing water pipe is opened, and the BAF reactor is carried out back flushing.
Through after the above-mentioned art breading, the main water-quality guideline of the water outlet of rising pipe 12 can reach: CODcr=30～50mg/L, BOD
5=5～10mg/L, turbidity=0.9～4.5NTU (the water outlet concentration of suspension is very low, and the SS measuring error is big, uses turbidity and characterizes the water outlet concentration of suspension), TN=5～10mg/L, TP=0.3～1.0mg/L, clearance is respectively: CODcr 〉=94%, BOD
5〉=98%, TN 〉=89%, TP 〉=91%.Effluent quality meets the requirement of urban wastewater treatment firm pollutant emission standard (GB18918-2002) primary standard and city miscellaneous water water quality standard (GB/T18920-2002).
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (9)
1. a biological method for treating waste water comprises sbr reactor device working stage and BAF reactor working stage, and it is characterized in that: biological method for treating waste water comprises: carry out the removal of organism and total phosphorus earlier in the sbr reactor device, this stage comprises following steps:
(1) water inlet: pretreated former water enters the sbr reactor device, stops during to the predetermined fluid level or the scheduled time;
(2) reaction: under mechanical stirring, the suspended sludge thorough mixing in water inlet and the sbr reactor device is under anaerobic finished anaerobic phosphorus release, follows the ammonification of organonitrogen and the cracking of larger molecular organics simultaneously; Stop after the mechanical stirring sbr reactor device micro-pore aeration is finished aerobic suction phosphorus and most of organic biological degradation;
(3) precipitation: stop aeration, mixed solution is quiescent setting in the sbr reactor device;
(4) spoil disposal: the rich phosphorus excess sludge of discharging after precipitation is finished, phosphorus is removed from system, and kept the activity of suspended sludge;
(5) draining: supernatant liquor is entered an intermediate water tank;
Then, carry out the removal of total nitrogen in the BAF reactor, this stage comprises following steps:
(1) denitrification: the BAF reactor will enter the BAF reactor from the BAF bottom from the water inlet of intermediate water tank with after its inner phegma mixes, and carry out denitrification at reactor lower part, simultaneously the further organism in the degradation of sewage;
(2) nitrated: as on the top of BAF reactor the ammonia nitrogen in the water inlet to be carried out nitratedly, be back to feed-water end by the internal reflux pipeline then, remove the total nitrogen in the system.
2. biological method for treating waste water according to claim 1 is characterized in that: described sbr reactor device only comprises anaerobism section and aerobic section, and aerobic section is finished till the organic degraded.
3. biological method for treating waste water according to claim 2 is characterized in that: the anaerobism section reaction times is 0.5～1.5 hour in the sbr reactor device, and the aerobic section reaction times is 2～4 hours.
4. biological method for treating waste water according to claim 1 is characterized in that: described BAF reactor comprises the anoxic section of bottom and the aerobic section on top, and anoxic section denitrification is a upward flow Prepositive denitrification form.
5. according to claim 1 or 4 described biological method for treating waste water, it is characterized in that: the particle diameter of filter medium that the particle diameter of filter medium that the anoxic section adopts in the described BAF reactor adopts greater than aerobic section.
6. biological method for treating waste water according to claim 5 is characterized in that: it is the filtrate of 5～6mm that the anoxic section adopts particle diameter, and it is the filtrate of 3～5mm that aerobic section adopts particle diameter.
7. biological method for treating waste water according to claim 6 is characterized in that: described filtrate is any in haydite, zeolite, shale, volcanics, coke, gac, the polystyrene.
8. biological method for treating waste water according to claim 5 is characterized in that: the aeration head in the described BAF reactor is arranged at the boundary of two kinds of particle diameter filtrates.
9. biological method for treating waste water according to claim 1 is characterized in that: adopt the parallel running of a plurality of sbr reactor device, make total system water inlet and water outlet continuously.
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| CNB2007100150672A CN100460341C (en) | 2007-06-21 | 2007-06-21 | Biological sewage-treating process |
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| CNB2007100150672A CN100460341C (en) | 2007-06-21 | 2007-06-21 | Biological sewage-treating process |
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| CN100460341C true CN100460341C (en) | 2009-02-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103449656B (en) * | 2012-05-30 | 2015-05-27 | 东莞理工学院 | Sequence fed-batch reactor and biological aerated filter (SFBR-BAF) biological nitrogen and phosphorus removal technology |
| CN104609550B (en) * | 2013-11-05 | 2017-03-01 | 中国石油化工股份有限公司 | A kind of method that immobilized sludge granule removes ammonia nitrogen in waste water |
| CN103601341B (en) * | 2013-11-22 | 2015-05-20 | 北京工业大学 | SBR (Sequencing Batch Reactor) and SBBR (Sequencing Biofilm Batch Reactor) municipal sewage high-efficiency biological treatment method and device based on anaerobic ammonia oxidation |
| CN104176824B (en) * | 2014-09-05 | 2016-06-29 | 北京坦思环保科技有限公司 | A kind of ammonium nitrate wastewater biochemical treatment apparatus and operation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60137492A (en) * | 1983-12-23 | 1985-07-22 | Meidensha Electric Mfg Co Ltd | Waste water treating apparatus |
| CN1208025A (en) * | 1997-08-07 | 1999-02-17 | 天津市市政工程设计研究院 | Continuous sewage treating process and system through intermittent aeration and by active sludge |
| CN1401592A (en) * | 2002-09-04 | 2003-03-12 | 清华大学 | Double-layer filter material biological aeration filter pond |
| US6790347B2 (en) * | 2001-10-24 | 2004-09-14 | Samsung Engineering Co., Ltd. | Batch style wastewater treatment apparatus using biological filtering process and wastewater treatment method using the same |
| CN1821121A (en) * | 2006-03-09 | 2006-08-23 | 武汉凯迪水务有限公司 | Waste water treating process of circulation sequence batched active sludge and its active sludge reactor |
-
2007
- 2007-06-21 CN CNB2007100150672A patent/CN100460341C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60137492A (en) * | 1983-12-23 | 1985-07-22 | Meidensha Electric Mfg Co Ltd | Waste water treating apparatus |
| CN1208025A (en) * | 1997-08-07 | 1999-02-17 | 天津市市政工程设计研究院 | Continuous sewage treating process and system through intermittent aeration and by active sludge |
| US6790347B2 (en) * | 2001-10-24 | 2004-09-14 | Samsung Engineering Co., Ltd. | Batch style wastewater treatment apparatus using biological filtering process and wastewater treatment method using the same |
| CN1401592A (en) * | 2002-09-04 | 2003-03-12 | 清华大学 | Double-layer filter material biological aeration filter pond |
| CN1821121A (en) * | 2006-03-09 | 2006-08-23 | 武汉凯迪水务有限公司 | Waste water treating process of circulation sequence batched active sludge and its active sludge reactor |
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