CN105585226B

CN105585226B - A kind of AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus and technique based on On-line Control

Info

Publication number: CN105585226B
Application number: CN201610125677.7A
Authority: CN
Inventors: 张唯; 段昌群; 和树庄; 陆轶峰
Original assignee: Yunnan University YNU
Current assignee: Yunnan University YNU
Priority date: 2016-03-04
Filing date: 2016-03-04
Publication date: 2018-02-06
Anticipated expiration: 2036-03-04
Also published as: CN105585226A

Abstract

The present invention relates to a kind of AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus and technique based on On-line Control, the device mainly includes anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, one-level settling tank, BAF, two level anoxic pond, the quick aeration tank of two level, two level settling tank, oxidation reduction potential determination control system, DO determination control system and aeration subsystem.The device is based on double sludge denitrification denitrogenation dephosphorizing principle, based on On-line Control technology, the denitrification dephosphorization techniques such as anaerobic phosphorus release, the secondary settlement of sludge, secondary denitrifying phosphorus uptake, secondary aerobic phosphorus absorption, secondary denitrification denitrogenation, the control of the low Ammonia Nitrification liquid of hypoxemia and mud mixed liquid backflow denitrification are optimized into combination, when carbon-nitrogen ratio of intaking is 6.5 14, carbon-phosphorus ratio is more than 50, under conditions of not additional organic carbon source, the advanced nitrogen dephosphorization to sanitary sewage is stably realized, effluent quality can reach the class above standard water quality of earth's surface 4.

Description

A kind of AAONAO continuous flow double sludge denitrification advanced nitrogens based on On-line Control remove Phosphorus device and technique

Technical field

The invention belongs to technical field of sewage, it is related to the advanced nitrogen dephosphorization purifying device and work of a kind of sanitary sewage Skill, it is suitable for sewage plant grassroot project, and in particular to a kind of lower based on on-line monitoring and control, foundation denitrification nitrogen and phosphorus removal Principle, carry out the device and its technique of secondary denitrification nitrogen and phosphorus removal.

Background technology

At present, China《Urban wastewater treatment firm pollutant emission standard》First grade discharging A class standards are total to sewage effluents The concentration guidelines up to standard of nitrogen are 15mg/L, and the concentration up to standard of total phosphorus is 0.6mg/L, far above China《Surface water environment quality mark It is accurate》Total nitrogen 2mg/L as defined in V class standard, total phosphorus 0.4mg/L value, if the water after directly sewage plant is purified is discharged into ground In table water, it will cause serious nitrogen phosphorus eutrophication pollution.In fact, most of sewage treatment plants in current China are actual Through causing urban environment and surrounding body secondary pollution into the sewage of new pollution sources, a large amount of so-called discharges " up to standard ", seriously The production and life of the people is influenceed, the research of the advanced nitrogen Dephosphorization New Technique and new technology of sewage is extremely urgent.

Traditional sewage denitrification and dephosphorization generally requires by nitrification, denitrification, releases phosphorus and inhale biochemical process, the experience such as phosphorus and detest The entirely different and conflicting environmental condition such as oxygen, aerobic, anoxic, it is often final because nitrification stage early stage almost runs out Organic matter of sewage, denitrification stage lack enough organic carbon sources, and difficult to realize stable and efficient nitrogen phosphorus clean-up effect. Therefore, the efficient of organic carbon source utilizes the always existing most of sewage treatment plant's sewage disposal works in China in sewage disposal process Skill needs the problem solved.Improve sewage treatment process to the Land use models of organic carbon source, introduce new denitrogenation dephosphorizing approach, profit Existing process is improved with advanced On-line Control technology, and the denitrification dephosphorization technique of the suitable high-precision control of research and development newly By as the emphasis and focus studied from now on.

Denitrification nitrogen and phosphorus removal technique fully utilizes the organic carbon source in sewage, by two kinds of microorganisms of nitrification and denitrification It is divided among suitable environment culture.By constantly enrichment DPAOs under anaerobic/anoxic alternation condition, original is utilized under anaerobic VFAs synthesizes internal carbon source PHA in water, and is completed under anoxic conditions by the PHA in electron acceptor oxidation Decomposition body of nitrate Amount inhales phosphorus reaction.Denitrogenation and dephosphorization are synchronously removed, solves and domestic sewage denitrifying is removed using conventional method The problem of phosphorus carbon source deficiency, have the characteristics that efficiently, low energy consumption, sludge output it is low, be it is more concerned at present, it is very promising A kind of Advance in New Technology of Biological Nutrient Removal.

Denitrifying phosphorus removal technique is broadly divided into two major classes：One kind is single sludge system, and representing technique is single sludge SBR and changes Enter technique, aerobic particle mud technique and UCT modified techniques（BCFS）；Another kind of is double sludge system, represent technique be A2N and Dephanox techniques.

Existing continuous flow double sludge denitrification denitrification dephosphorization technique is only one-level denitrification pond, due to surmounting sludge The a large amount of ammonia nitrogens carried, the general ammonia nitrogen concentration of water outlet is higher, and total nitrogen clean-up effect is undesirable, it is impossible to realizes advanced nitrogen dephosphorization. Further, since part mineralized nitrogen is nitrate anion by reactor end aeration, after entering second pond, meeting when sludge settling Generation part denitrification, nitrogen is produced, influence the settling property of sludge, the water outlet sludge that can not be settled on a small quantity that often suspends is led Cause eventually affects phosphorus and CODcr purification efficiency.Third, the sludge of second pond backflow can typically be entrained with more mostly nitrate Nitrogen, organic matter will be consumed by being back to anaerobic pond, hinder anaerobic phosphorus release, and then produce unfavorable shadow to denitrification below and dephosphorization Ring.Therefore, the problem of how overcome the deficiencies in the prior art is current technical field of sewage urgent need to resolve.

The content of the invention

The present invention can not realize advanced nitrogen dephosphorization for denitrification nitrogen and phosphorus removal techniques such as existing A2N and Dephanox, The problem of effluent quality is unstable, there is provided a kind of AAONAO continuous flow double sludge denitrification advanced nitrogens based on On-line Control remove Phosphorus device and technique, the device and technological basis double sludge denitrification denitrogenation dephosphorizing principle, based on On-line Control technology, by anaerobism Release phosphorus, the secondary settlement of sludge, secondary denitrifying phosphorus uptake, secondary aerobic phosphorus absorption, secondary denitrification denitrogenation, the low Ammonia Nitrification of hypoxemia The denitrification dephosphorization technique such as the control of liquid and mud mixed liquid backflow denitrification optimizes combination, realizes the advanced nitrogen of sewage The effect of dephosphorization.

The technical solution adopted by the present invention is as follows：

A kind of AAONAO based on On-line Control（That is anaerobic-anoxic-oxic-nitrifying-anoxic- oxic）Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, including anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, One-level settling tank, BAF, two level anoxic pond, the quick aeration tank of two level, two level settling tank, oxidation reduction potential determination Control system, aeration subsystem, DO determination control system, PLC and computer；

Anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level and one-level settling tank are sequentially connected by pipeline, aeration and biological Filter tank, two level anoxic pond, the quick aeration tank of two level and two level settling tank are sequentially connected by pipeline, and one-level settling tank supernatant goes out Water end (W.E.) is connected with by water inlet end above pipeline BAF；

The bottom mud discharging mouth of one-level settling tank surmounts pump by sludge and is connected with the water inlet end of two level anoxic pond；

The water side of the quick aeration tank of described two level also returns to pump and the water inlet of two level anoxic pond by mud mixed liquid End is connected；

Water side below described BAF also returns to pump and one-level anoxic pond by aeration tank nitrification liquid Water inlet end is connected；

The water inlet end of anaerobic pond is provided with intake pump；

It is equipped with described one-level anoxic pond, the quick aeration tank of one-level, two level anoxic pond and the quick aeration tank of two level latent Water agitator, make the uniform mixing of sludge and water；

The top of two level settling tank is provided with drainpipe；The bottom mud discharging mouth of two level settling tank returns to pump and anaerobism by sludge The water inlet end in pond is connected；The bottom mud discharging mouth of two level settling tank is also connected with sludge pump；

Mud scraper is equipped with described one-level settling tank and two level settling tank；

Described oxidation reduction potential determination control system includes 4 on-line oxidation reduction potential determining instruments and 2 sets of exposures Gas subsystem, every oxidation reduction potential determination instrument include the oxidation-reduction electrode and on-line oxidation reduction potential of electrical connection Meter；The oxidation-reduction electrode of 4 sets of oxidation reduction potential determination instruments is respectively arranged on the water side of anaerobic pond, the quick aeration tank of one-level Water side, the water side of two level anoxic pond and the water side of the quick aeration tank of two level；In 4 sets of oxidation reduction potential determination instruments The corresponding oxidation-reduction electrode electrical connection in on-line oxidation reduction potential meter one end, the other end electrically connects with PLC；

Described DO determination control system includes 1 online DO determination instrument and 1 set of aeration subsystem, described Online DO determination instrument include electrical connection dissolved oxygen electrode and online dissolved oxygen instrument, described dissolved oxygen electrode be located at Between the water side of BAF and the water inlet end of two level anoxic pond in pipeline, dissolved oxygen electrode and online dissolved oxygen instrument Output end electrically connects, and the input of described online dissolved oxygen instrument electrically connects with PLC；

Described often set aeration subsystem includes aeration head, gas flowmeter, aeration pump and the frequency converter being sequentially connected, and exposes Air pump is connected with the power output end of frequency converter；The power input of frequency converter in 3 sets of aeration subsystems is electrically connected with PLC Connect；The aeration head belonged in the aeration subsystem of oxidation reduction potential determination control system be respectively arranged on the quick aeration tank of one-level and The quick aeration tank bottom of two level, the aeration head belonged in the aeration subsystem of DO determination control system are filtered located at aeration and biological Bottom of pond portion；

Described PLC is connected with computer.

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, two level anoxic pond and two level Quick aeration tank is both needed to keep certain sealing state, avoids outside air from entering as far as possible；

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, two level anoxic pond and two level Quick aeration tank seals, and the quick aeration tank of one-level anoxic pond, one-level, BAF, two level anoxic pond and two level are quick The blast pipe with air bleeding valve is equipped with the top of aeration tank；Anaerobic pond is connected with the air chamber of one-level anoxic pond；Specifically refer to：

With closed above one-level anoxic pond, air chamber is connected described anaerobic pond, passes through the exhaust above one-level anoxic pond Valve is outwards vented；

It is closed above the quick aeration tank of described one-level, outwards it is vented by the air bleeding valve above the quick aeration tank of one-level；

It is closed above described BAF, outwards it is vented by the air bleeding valve above BAF；

It is closed above described two level anoxic pond, outwards it is vented by the air bleeding valve above two level anoxic pond；

It is closed above the quick aeration tank of described two level, outwards it is vented by the air bleeding valve above the quick aeration tank of two level.

It is further preferred that described anaerobic pond is in series by multiple ponds.

It is further preferred that described two level anoxic pond is in series by multiple ponds.

It is in series it is further preferred that described anaerobic pond is two ponds, one-level anoxic pond is single pond, and one-level is quick Aeration tank is single pond, and two level anoxic pond is that two ponds are connected, and the quick aeration tank of two level is single pond.The quantity in each unit process pond Can suitably it increase and decrease under conditions of basic function is ensured.

It is further preferred that between described PLC and on-line oxidation reduction potential meter, between PLC and frequency converter, Electrical connection between PLC and online dissolved oxygen instrument and between PLC and computer is connected by communication using 485.

It is further preferred that BAF top is cylinder type, bottom is that the cone angle of same diameter is 60 degree and fallen The joint of cone, circular cone and cylinder is horizontally disposed with stainless steel sieve tray, mesh size 5mm, and filler shape is loaded on sieve tray Into packing layer, packing material size 0.6-1.5cm；It is provided with water distributor directly over packing layer, water distributor and BAF enter Water end (W.E.) is connected, and water distributor is used to ensure uniformly to intake, and the water level of BAF is typically slightly above packing layer；Aeration life Aeration head in thing filter tank is arranged on above sieve tray, and the distance of aeration head and sieve tray is the 1/3 of packing layer thickness；

Wherein, described filler is filler such as volcanic rock, haydite, the stone of volcanic rock or the easy apposition growth of other microorganisms Sand or zeolite etc..The main apposition growth in filler surface the biomembrane using nitrifier as dominant bacteria, and this biomembrane can be by ammonia Nitrogen is converted into nitrite nitrogen and nitrate nitrogen.When water to it is dirty when, because aeration above the aeration head of BAF Oxygenation is formed being aerated nitrification zone, and aeration head lower section is not because have aeration to be formed deoxidation nitrification zone.Therefore, control The dissolved oxygen of effluent of aeration biological filter is in a less concentration range, it is possible to the complete nitrification of ammonia nitrogen is realized, to reach The optimal nitrification liquid water yielding condition of BAF hypoxemia and low ammonia nitrogen concentration.This deoxidation nitrification liquid will not be to below it is anti- Nitration reaction produces inhibitory action.

It is further preferred that entering for pond is also discharged in the water side of described BAF by draining pump and cleaning Mouth end is connected, and the top in cleaning discharge pond returns to pump by supernatant and is connected with the water inlet end of BAF；Cleaning discharge The bottom mud discharging mouth in pond is connected by cleaning sludge return pump with the water inlet end of one-level anoxic pond；Wherein, BAF Between water side and draining pump, supernatant returns between pump and BAF and cleaning discharge pond and cleaning sludge return Magnetic valve is equipped between pump；Draining pump, supernatant return to pump, cleaning sludge return pump and magnetic valve with PLC output end phases Connection.

General BAF is run 20 days or so, due to the biofilm detachment adhered on packing layer and on a small quantity from one-level Settling tank flows into the accumulation of the activated sludge of BAF, easily causes biofilter to block and causes the release of phosphorus, should BAF is cleaned.The method of cleaning：BAF uses the side of downward rapid deflation by draining pump Method, the filler to be come off in BAF and activated sludge are washed into cleaning discharge pond, and carry out quiescent settling, will be heavy Supernatant after drop returns to pump with supernatant and returned in BAF.The sludge of sedimentation（The biomembrane to come off and/or dirt Mud, rich in nitrobacteria）One-level anoxic pond is can return to by cleaning sludge return pump, is that the activated sludge in reaction tank supplements nitre Change bacterium.All related pumps and magnetic valve control by PLC in BAF cleaning process, and can pass through computer end Program interface realize manual control.

It is further preferred that the top of described BAF provides by pipeline and not for BAF The inlet end of the aeration pump of other two sets of aerations subsystem of gas is connected.By used oxygen concentration above BAF Relatively low air is as the quick aeration tank of one-level and the gas source of the quick aeration tank aeration pump of two level.The quick aeration tank of one-level and Nitrogen is discharged in the quick aeration tank of two level by this low-oxygen aeration mode, improves one-level, two level settling tank sludge settling property, together When by being aerated promote aerobic phosphorus absorption to act on, avoid excessive anaerobism from producing the secondary release of phosphorus, strengthen the oxidative nitration to ammonia nitrogen, Reduce ammonia nitrogen concentration.When the carbon-nitrogen ratio of water inlet is relatively low（4.5-6.5）When, the quick aeration tank of one-level and the quick aeration tank of two level are main The stripping function of nitrogen is considered, by the way of this low-oxygen aeration.When the carbon-nitrogen ratio of water inlet is very high（6.5-14）When, and When the quick aeration tank aeration quantity of two level is larger, the gas source of the quick aeration tank aeration pump of two level can directly be switched to oxygen The normal natural air of Gas content.

The present invention also provides a kind of continuous flow double sludge denitrification denitrification dephosphorization technique, using above-mentioned based on On-line Control AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, comprise the concrete steps that：

Sewage enters anaerobic pond through intake pump, and sludge is entered after anaerobic pond by sludge return pump to be mixed with sewage, Phosphorus is discharged under anaerobic condition, anaerobic pond end sets oxidation-reduction electrode being normally carried out for phosphorus release is monitored and controlled；

After anaerobic reaction terminates, mud mixed liquid flows into one-level anoxic pond, passes through exposure with what is flowed out from BAF Gas pond nitrification liquid returns to the nitrification liquid that pump returns and mixed, and carries out first time denitrification denitrogenation and inhales phosphorus reaction；

After first time anti-nitration reaction denitrogenation and suction phosphorus terminate, mud mixed liquid flows into the quick aeration tank of one-level, enters to act charitably Oxygen inhales the nitration reaction of phosphorus, nitrogen stripping and ammonia nitrogen, by the oxidation installed in the quick aeration tank of one-level and two level anoxic pond also The measurement result of primary electrode controls the aeration quantity of the quick aeration tank of one-level, to cause the quick aeration tank of one-level and two level anoxic pond Oxidation reduction potential control scope meet the requirements；

Afterwards, one-level settling tank, the sedimentation point of one-level settling tank are flowed into from the mud mixed liquid of the quick aeration tank outflow of one-level Separate out the supernatant taken and flow into BAF, carry out nitration reaction, obtain nitrification liquid；Dissolved oxygen electrode monitors water outlet on-line The change of dissolved oxygen, and by controlling the nitrification liquid dissolved oxygen concentration that aeration control flows out from BAF in 0.5- Between 1.0mg/L, so that it may ensure that ammonia nitrogen almost all is degraded, realize the nitrification liquid water yielding condition of the low ammonia nitrogen concentration of hypoxemia；

A nitrification liquid part returns to one-level anoxic pond with aeration tank nitrification liquid return pump and carries out anti-nitration reaction, another portion Nitrification liquid is divided to flow into two level anoxic pond；The sludge of one-level settling tank sedimentation surmounts pump through sludge and is delivered in two level anoxic pond, with The nitrification liquid and return to what pump returned by mud mixed liquid from the quick aeration tank outflow of two level that BAF flows into Mud mixed liquid is mixed, and carries out second of anti-nitration reaction；

After second of anti-nitration reaction terminates, mud mixed liquid flows into the quick aeration tank of two level from two level anoxic pond and enters to act charitably Oxygen inhales phosphorus（By remaining phosphorus ligands in mixed liquor）, nitrogen stripping and remaining ammonia nitrogen nitration reaction；In the quick aeration tank of two level The oxidation-reduction electrode on-line monitoring that sets of end and control two level quick aeration tank aeration quantity；

Finally, pump is returned to by mud mixed liquid from a mud mixed liquid part for the quick aeration tank outflow of two level to be back to Two level anoxic pond carries out denitrification, and another part then flows directly into two level settling tank and settled, and the supernatant after sedimentation is made Discharged for scavenging solution；Partial sludge returns to pump by sludge and returns to anaerobic pond and start new circulation, another part after sedimentation Sludge is quantitatively discharged to outside the present apparatus as excess sludge with sludge pump；

Wherein, mud mixed liquid is in each pond residence time：Anaerobic pond 1-2.5h, one-level anoxic pond 0.5-1.5h, one-level are fast Fast aeration tank 0.2-1h, two level anoxic pond 1-2.5h, the quick aeration tank 0.5-1.5h of two level；

One-level settling tank supernatant is 1-5h in the BAF residence time；

The gas-water ratio of BAF is：10-40；

Scope of the sludge concentration control of anaerobic pond, one-level anoxic pond and two level anoxic pond in 2000mg/L ~ 5000mg/L It is interior；

When water inlet carbon-nitrogen ratio be 6.5-14, when carbon-phosphorus ratio is more than 50, using flow rate pump of intaking as reference, each flow rate pump of the present apparatus Proportion：Intake pump 100%, aeration tank nitrification liquid return to pump 200%-400%, and sludge surmounts flow rate pump 40%-80%, and sludge mixes Close liquid and return to flow rate pump 100%-200%, sludge returns to flow rate pump 50%-150%；

When water inlet carbon-nitrogen ratio be 4.5-6.5, when carbon-phosphorus ratio is more than 50, wherein, using flow rate pump of intaking as reference, the present apparatus is each Flow rate pump proportion：Intake pump 100%, aeration tank nitrification liquid return to pump 100%-300%, and sludge surmounts flow rate pump 40%-80%, Mud mixed liquid returns to flow rate pump 0%, and sludge returns to flow rate pump 50%-150%；

When water inlet carbon-nitrogen ratio is 6.5-14, when carbon-phosphorus ratio is more than 50, each reaction tank of oxidation reduction potential control system aoxidizes Reduction potential control range：Anaerobic pond<- 300mv, quick aeration tank -250 ~ -140mv of one-level, two level anoxic pond -160 ~ - 100mv, quick aeration tank+50 ~+120mv of two level；

When water inlet carbon-nitrogen ratio is 4.5-6.5, when carbon-phosphorus ratio is more than 50, each reaction tank of oxidation reduction potential control system aoxidizes Reduction potential control range：Anaerobic pond<- 300mv, quick aeration tank -200 ~ -120mv of one-level, two level anoxic pond -150 ~ - 50mv, the quick 0 ~+90mv of aeration tank of two level.

After the present apparatus and technique dephosphorization mainly absorb phosphorus by sludge, completed by way of discharging excess sludge, In order to ensure preferable phosphor-removing effect, it is further preferred that the sludge retention time of the present apparatus is 10-17 days.

Based on whole device is controlled with PLC, administrative staff work as sewage quality by the operation of host computer procedure supervising device In the case of relatively stable, administrative staff are according to the situation of the water quality of sewage, carbon-nitrogen ratio and carbon-phosphorus ratio and the purification to be reached Effect, it is determined that optimal nitrification liquid reflux pump, mud mixed liquid reflux pump, sludge return to pump and sludge surmounts the velocity ratio of pump, Further by testing the situation of change of Inlet and outlet water and each reaction tank titanium pigment, ammonia nitrogen and nitrate anion, it is determined that and adjustment anaerobism Pond, the quick aeration tank of one-level, two level anoxic pond, the specific control range of the quick aeration tank oxidation-reduction potential of two level.Work as sewage When water quality changes, PLC will automatically adjust the control range of oxidation-reduction potential according to actual conditions, enable device automatic It is rapid to adapt to.When sewage quality changes greatly, then scope of the administrative staff according to carrying out practically situation to control condition is needed It is adjusted.

The principle of PLC control oxidation-reduction potentials is PLC by reading the quick aeration tank of anaerobic pond, one-level and two level anoxic The value of the oxidation-reduction potential of pond and the quick aeration tank of two level, according to the scope of control, exported by the power supply for changing frequency converter Frequency, so as to change the aeration quantity of aeration pump, to control the oxidation reduction potential value in each reaction tank.PLC is aerated by reading The value for the dissolved oxygen that the online dissolved oxygen instrument in biofilter monitors, according to the scope of control, by the output frequency for changing frequency converter Rate, change the aeration quantity of aeration pump, to control the dissolved oxygen concentration of effluent of aeration biological filter, realize hypoxemia and low ammonia nitrogen concentration Nitrification liquid.PLC is in real time by the value, the value of BAF dissolved oxygen and the frequency of frequency converter of each reaction tank oxidation-reduction potential Rate feeds back to computer end program circle.Gas flowmeter is only intended to the situation of keeper's manual record aeration, can be not as this The direct control parameter of device.

When carbon-nitrogen ratio of intaking is 6.5-14, one-level anoxic pond is not being influenceed and two level anoxic pond realizes that thorough denitrification removes In the case of nitrogen, just allowed into the ammonia nitrogen in the quick aerated reaction pond of two level in the aeration intensity for ensuring the quick aeration tank of two level Completely on the basis of nitrification, device should select higher mud mixed liquid reflux pump velocity ratio and higher nitrification liquid reflux pump Velocity ratio is to realize the Nitrogen/Phosphorus Removal of depth；The quick aeration tank of one-level should use the used oxygen concentration of BAF compared with Low air is aerated；For the quick aeration tank of two level, should be aerated using the fresh air without aeration.

When it is 4-6.5 to handle sewage carbon-nitrogen ratio, and again in the design under conditions of not additional organic carbon source：Sludge mixes Liquid does not flow back, and dispenses mud mixed liquid and returns pump and pipeline；Less nitrification liquid reflux pump velocity ratio is selected, reduces one-level anoxic The denitrification load in pond；The aeration pump of the quick aeration tank of firsts and seconds is relatively low using the used oxygen concentration of BAF Air be aerated,

The determination of specific oxidation reduction potential control scope：

1st, under normal operating conditions, the terminal oxidized reduction potential of anaerobic pond should be less than -300mv to the present apparatus.Higher than this Potential value is usually that too big etc. factor of the quick aeration tank aeration quantity of I and II causes denitrification because the carbon-nitrogen ratio of sewage is smaller It is suppressed.At this moment a large amount of discharges of water outlet nitrate anion, part nitrate anion back into anaerobic pond with sludge, and anaerobic pond is remaining Nitrate anion, the release of phosphorus are suppressed, and the whole present apparatus will deteriorate, and dephosphorization and denitrification effect all will fall rapidly upon.Such case, First by the control range for the oxidation-reduction potential for lowering the quick aeration tank of I and II and two level anoxic pond, secondly can lower The measure such as the reflux pump of mud mixed liquid and the velocity ratio of nitrification liquid reflux pump ensures the normal operation of device.If by anti- Polyphony examination still can not obtain stable state of a control, administrative staff should determine sewage carbon-nitrogen ratio and carbon-phosphorus ratio whether at this Invent the scope introduced, and the biodegradable of the organic matter in sewage.

2nd, when carbon-nitrogen ratio of intaking is 6.5-14：On the one hand the quick aeration tank of one-level will avoid excess aeration from causing organic carbon Source deficiency influences the anti-nitration reaction of two level anoxic pond below；On the other hand, aeration deficiency is also avoided to cause two level anoxic Pond denitrifying phosphorus uptake is ineffective and the secondary release of phosphorus occurs, and it is too high to ultimately result in the concentration of the quick aeration tank phosphorus of two level, Dephosphorization overload of power, aerobic phosphorus absorption can not complete the situation of the deep purifying of phosphorus.When influent quality is stable, according to advance test The quick aeration tank of one-level set and the control range of two level anoxic pond oxidation-reduction potential control；When change of water quality is larger When, PLC can not be realized to the oxidation-reduction potential of two level anoxic pond according to the control range of the oxidation-reduction potential set Control, PLC will realize two level anoxic pond oxidation-reduction potential by the control range of the quick aeration tank of adjust automatically one-level Control requires.

3rd, when intake carbon-nitrogen ratio be 6.5-14 when, the quick specific control range of aeration tank oxidation-reduction potential of two level be Ensure anaerobic pond, the quick aeration tank of one-level and two level anoxic pond the stably and controllable system of oxidation-reduction potential in the case of, with reference to going out The orthophosphates of water and the concentration of ammonia nitrogen actually determine.

4th, when carbon-nitrogen ratio of intaking is 6.5-14：（1）When the concentration of present apparatus water outlet phosphorus is higher, administrative staff can adjust The control range of the oxidation-reduction potential of the quick aeration tank of high one-level, the quick aeration tank of two level and two level anoxic pond, utilizes two level The clean-up effect for the phosphorus that the denitrifying phosphorus uptake of quick aeration tank aerobic phosphorus absorption and lifting two level anoxic pond acts on improving；（2）When The clean-up effect of water outlet phosphorus is very good, but is generally because one-level is quickly aerated when the clean-up effect of total nitrogen is bad Pond and the quick aeration tank aeration of two level are excessive, cause two level anoxic pond organic carbon source to lack, denitrification is not thorough, causes water outlet The higher situation of nitrate nitrogen concentration.At this moment the quick aeration tank of one-level, two level anoxic pond and the quick aeration tank of two level can be lowered The control range of oxidation-reduction potential.

5th, when the carbon-nitrogen ratio for handling sewage is 4-6.5, deep purifying effect is realized, can be anti-in one-level or two level The nitrification stage realizes advanced nitrogen dephosphorization using additional organic carbon source, its control method and the control of the higher sewage of carbon-nitrogen ratio It is consistent, just it is not described in detail.

6th, when processing sewage carbon-nitrogen ratio is 4-6.5, and not additional organic carbon source when, be to avoid one-level anoxic first in control Pond denitrification is not thorough, and nitrate nitrogen enters one-level settling tank and denitrification generation nitrogen occurs, and influences the sedimentation of sludge.Secondly, The quick aeration tank of one-level is for stripping nitrogen rather than aerobic phosphorus absorption, as long as the intensity of aeration can guarantee that sludge has preferable Settling property.Third, two level anoxic pond sets suitable oxidation reduction potential control scope, remain two level anoxic pond A small amount of nitrate nitrogen（1-2mg/L）The removal effect of intensified anti-nitrated phosphorous-removal, avoid the secondary release of phosphorus.Fourth, two level is fast Fast aeration tank is to meet stripping nitrogen first, just can be with when water outlet phosphorus content is higher when organic carbon source is more sufficient Increase aeration quantity and strengthen aerobic phosphorus absorption and nitrification, therefore the quick aeration tank of two level should select appropriate oxidation-reduction potential control Scope processed.Because two level anoxic pond does not realize complete denitrification, the air that the quick aeration tank of two level provides simply meets stripping Nitrogen, it is not enough to aoxidize ammonia nitrogen, mud mixed liquid does not flow back, the measures such as mixed liquid recycle ratio is lowered, therefore has part ammonia nitrogen Remain in water outlet, denitrification effect can decline, and for phosphor-removing effect because the reinforcing of denitrification dephosphorization effect, its purification will not It is affected.

One-level settling tank and two level settling tank are provided with mud scraper, and mud scraper is driven by reducing motor to slowly run, rotating speed with Not stirring sludge is advisable.Mud scraper can reduce the residence time of sludge, avoid sludge from building up generation part in settling tank Anaerobism, the secondary release of caused phosphorus, while the sludge concentration of anaerobic pond, one-level anoxic pond and two level anoxic pond can be improved, add Fast denitrification rate.Mud scraper includes reducing motor, central shaft, cleaning shoe and the support frame for supporting cleaning shoe, and cleaning shoe is edge The taper area edge of settling tank makees the scraper plate around settling tank central rotation.The main function of mud scraper is by settling tank bottom pyramidal The sludge at edge scrapes the center of settling tank, carries out appropriate disturbance to the sludge of settling zone, fills up sludge and evacuate top Cavity, accelerate suction of the sludge pump to sludge.Mud scraper can significantly improve the mobility of sludge, reduce sludge to greatest extent and exist The residence time of settling tank, improve the concentration of anaerobic pond and anoxic pond sludge.

Compared with prior art, its advantage is the present invention：

Present apparatus startup stage makes Denitrifying Phosphate Accumulating Organisms quickly be exposed as anaerobic pond-anoxic pond-one-level by technique adjustment The dominant bacteria of activated sludge in gas-two level anoxic-quick aeration tank of two level, turn into nitrobacteria and filled out in BAF The dominant bacteria of the biomembrane adhered on material.

The present invention sets oxidation-reduction electrode to be realized to regulate and control to whole technique under anaerobic condition in anaerobic pond end The release of phosphorus；Denitrification denitrogenation step by step and step by step denitrifying phosphorus uptake mistake are realized by one-level anoxic pond and two level anoxic pool unit Journey；The quick aeration tank of one-level and the quick aeration tank of two level are set, and oxidation-reduction electrode is set, On-line Control aeration quantity, is realized Aerobic phosphorus absorption and aerobic nitrification step by step, while excessive anaerobic environment after denitrification can be avoided with stripping nitrogen again Cause the secondary release of phosphorus；

Redox electricity to each reaction tank is realized by the aeration quantity of PLC control frequency converter indirect control aeration pumps Position monitoring；Realized by the aeration quantity of PLC control frequency converter indirect control aeration pumps to effluent of aeration biological filter dissolved oxygen Monitoring, reach the nitrification liquid water outlet of the low ammonia nitrogen of BAF and low DO concentration；

The ammonia nitrogen of mud mixed liquid is directly diluted by one-level anoxic pond compared to the A2N techniques present invention, then will Sludge is pumped into two level anoxic pond after sedimentation concentration, while the mud mixed liquid of the quick aeration tank of two level is returned into two level anoxic The dilution of second of ammonia nitrogen is carried out in pond, greatly reduces the ammonia nitrogen concentration and two level settling tank water outlet ammonia of the quick aeration tank of two level The concentration of nitrogen；

Using On-line Control technology, the sewage in optimum controling range undergoes denitrification denitrogenation twice to apparatus of the present invention, twice Dilution to ammonia nitrogen, oxidative nitration reaction, and the process such as backflow anoxic pond denitrification of mud mixed liquid are carried out to ammonia nitrogen twice, Advanced nitrogen finally is done step-by-step；By anaerobic phosphorus release, denitrification dephosphorization twice, aerobic phosphorus absorption, is finally done step-by-step depth twice Spend dephosphorization；Advanced nitrogen dephosphorization, effluent quality can not be realized by solving the denitrification nitrogen and phosphorus removal such as A2N and Dephanox technique The problem of unstable；

Apparatus of the present invention are based on double sludge denitrification denitrogenation dephosphorizing principle, establish anaerobic- anoxic- oxic-anaerobic-aerobic Denitrifying activated sludge system and with aerobic nitrification function biofilm system（That is BAF）What is be combined is double Sludge system.

The present invention is set in BAF bottom without aeration deoxidation area, and sets dissolving at aeration nitrification tank water outlet Oxygen electrode, the dissolved oxygen content for monitoring nitrification liquid water outlet on-line control aeration quantity, subtract while ensureing that ammonia nitrogen nitrifies completely Few dissolved oxygen enters firsts and seconds anoxic pond；

One-level settling tank and two level settling tank set mud scraper, reduce the residence time of sludge, avoid sludge accumulation from producing Local anaerobic, the secondary release of caused phosphorus；

Apparatus of the present invention can be according to different sewage qualities and carbon-nitrogen ratio situation, by determining the soluble positive phosphorus of each reaction tank Hydrochlorate, ammonia nitrogen, the change in concentration situation of nitrate anion, determine the optimal most stable of control model of each reaction tank oxidation-reduction potential Enclose；When processing CODcr is 150mg/L to 1000mg/L, carbon-nitrogen ratio 6.5-14, carbon-phosphorus ratio>During 60 sanitary sewage, the present apparatus Water outlet total nitrogen, total phosphorus and CODcr many indexs can reach the class above standard of surface water four；When processing CODcr be 150mg/L extremely 1000mg/L, carbon-nitrogen ratio 4-6.5, carbon-phosphorus ratio>During 50 sanitary sewage, the present apparatus is multinomial as processing water outlet total phosphorus and CODcr Index can reach the class above standard of surface water four, and the total nitrogen index of water outlet is higher than one-level A close to the class standard of one-level surface water five Mark is horizontal.

It when concentration of wastewater is relatively low, can correspondingly increase intake pump velocity ratio, correspondingly reduce nitrification liquid reflux pump stream Speed with mud mixed liquid reflux pump velocity ratio than improving the operational efficiency of the present apparatus.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.

Fig. 1 is the knot of the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus of the invention based on On-line Control Structure schematic diagram；

Wherein, 1, intake pump；2nd, sludge recurrent canal；3rd, the first anaerobic pond；4th, submersible agitator；5th, the second anaerobic pond；6、 Oxidation-reduction electrode；7th, on-line oxidation reduction potential meter；8th, the blast pipe with air bleeding valve；9th, one-level anoxic pond；10th, one-level is fast Fast aeration tank；11st, aeration head；12nd, one-level settling tank；13rd, mud scraper；14th, sieve tray；15th, gas flowmeter；16th, aeration pump； 17th, frequency converter；18th, online dissolved oxygen instrument；19th, sludge surmounts pump；20th, aeration tank nitrification liquid returns to pump；21st, sludge is cleaned to return Pump；22nd, magnetic valve；23rd, BAF；24th, draining pump；25th, supernatant returns to pump；26th, dissolved oxygen electrode；27th, clean Discharge pond；28th, the first two level anoxic pond；29th, the second two level anoxic pond；30th, the quick aeration tank of two level；31st, mud mixed liquid returns Return pump；32nd, sludge returns to pump；33rd, sludge pump；34th, two level settling tank；35、PLC；36th, computer；37th, drainpipe；38th, water distribution Pipe；39th, packing layer.The direction of arrow in figure is the flow direction of sewage, sludge, mud mixed liquid or gas.

Embodiment

Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.

Those skilled in the art of the present technique are it is understood that the correlation module and its function of realization that are related in the present invention It is that computer software programs conventional in the prior art are carried on the device, device or system of hardware after improvement and its composition It is not that computer software programs of the prior art or relevant agreement are improved or relevant agreement achieves that.For example, Computer hardware system after improvement still can realize the spy of the hardware system by loading existing operation system of software Determine function.It is understood, therefore, that the innovation of the present invention is the improvement to hardware module in the prior art and its company Syntagmatic is connect, rather than is only the improvement to realizing the software carried about function or agreement in hardware module.

Those skilled in the art of the present technique are it is understood that correlation module mentioned in the present invention is performed for the application Described in one or more hardware devices in step in operation, method, flow, measure, scheme.The hardware device can Think required purpose and specially design and manufacture, or can also use all-purpose computer in known device or it is known its His hardware device.The all-purpose computer is activated or reconstructed with having the procedure selection being stored in it.

Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one It is individual ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges Diction " comprising " refer to the feature, integer, step, operation, element and/or component be present, but it is not excluded that in the presence of or addition One or more other features, integer, step, operation, element, component and/or their groups.It should be understood that when we claim member Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or there may also be Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or coupling.Wording used herein "and/or" includes any cell of one or more associated list items and all combined.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein（Including technology art Language and scientific terminology）With the general understanding identical meaning with the those of ordinary skill in art of the present invention.Should also Understand, those terms defined in such as general dictionary, which should be understood that, to be had and the meaning in the context of prior art The consistent meaning of justice, and unless defined as here, will not be with idealizing or the implication of overly formal be explained.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, if annexation used herein is without spy Different explanation, the function of the present invention can be realized, and it is identical with the general understanding of the those of ordinary skill in art of the present invention .

With reference to embodiment, the present invention is described in further detail.

It will be understood to those of skill in the art that the following example is merely to illustrate the present invention, and it should not be regarded as limiting this hair Bright scope.In the examples where no specific technique or condition is specified, according to the technology or condition described by document in the art Or carried out according to product description.Material therefor or the unreceipted production firm person of instrument, it is that can be obtained by buying Conventional products.

As shown in figure 1, a kind of AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, Including anaerobic pond, one-level anoxic pond 9, the quick aeration tank 10 of one-level, one-level settling tank 12, BAF 23, two level anoxic Pond, the quick aeration tank 30 of two level and two level settling tank 34, in addition to oxidation reduction potential determination control system, aeration subsystem, DO determination control system, PLC35 and computer 36；

Anaerobic pond is that two ponds are in series, i.e. the first anaerobic pond 3 and the second anaerobic pond 5 are connected；

One-level anoxic pond 9 is single pond, and the quick aeration tank 10 of one-level is single pond, and the quick aeration tank 30 of two level is single pond.

Two level anoxic pond is that two ponds are connected, i.e. the first two level anoxic pond 28 and the second two level anoxic pond 29 are connected；

First anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, the quick aeration tank 10 of one-level and one-level settling tank 12 according to Secondary to be connected by pipeline, BAF 23, the first two level anoxic pond 28, the second two level anoxic pond 29, two level are quickly aerated Pond 30 passes sequentially through pipeline with two level settling tank 34 and is connected, the supernatant water side of one-level settling tank 12 with BAF 23 Top water inlet end is connected by pipeline；

The bottom mud discharging mouth of one-level settling tank 12 surmounts pump 19 and the water inlet end phase of the first two level anoxic pond 28 by sludge Even；

The water side of the quick aeration tank 30 of described two level also returns to the two level anoxic of pump 31 and first by mud mixed liquid The water inlet end in pond 28 is connected；

The water side of the described lower section of BAF 23 also returns to pump 20 and one-level anoxic by aeration tank nitrification liquid The water inlet end in pond 9 is connected；

The water inlet end of first anaerobic pond 3 is provided with intake pump 1；

Described the first anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, the quick aeration tank 10 of one-level, the first two level lack Submersible agitator 4 is equipped with oxygen pond 28, the second two level anoxic pond 29 and the quick aeration tank 30 of two level；

To avoid air from largely entering, reaction environment is influenceed, the quick aeration tank 10 of described one-level anoxic pond 9, one-level, is exposed Gas biofilter 23, the second two level anoxic pond 29 and the quick top of aeration tank 30 of two level have lid to seal, and are provided with row The blast pipe 8 of air valve；

The top of two level settling tank 34 is provided with drainpipe 37；The bottom mud discharging mouth of two level settling tank 34 passes sequentially through sludge and returned Return pump 32 and sludge recurrent canal 2 is connected with the water inlet end of the first anaerobic pond 3；The bottom mud discharging mouth of two level settling tank 34 also with row Dredge pump 33 is connected；

Mud scraper 13 is equipped with described one-level settling tank 12 and two level settling tank 34；

Described oxidation reduction potential determination control system includes 4 on-line oxidation reduction potential determining instruments and 2 sets of exposures Gas subsystem, the oxidation-reduction electrode 6 and on-line oxidation reduction potential meter 7 of every oxidation reduction potential determination instrument electrical connection；4 The oxidation-reduction electrode 6 of set oxidation reduction potential determination together is respectively arranged on the water side of the second anaerobic pond 5, one-level is quickly aerated The water side of the water side in pond 10, the water side of the second two level anoxic pond 29 and the quick aeration tank 30 of two level；4 sets of redox electricity The corresponding oxidation-reduction electrode 6 in 7 one end of on-line oxidation reduction potential meter in position-finding together electrically connects, the other end with PLC 35 is electrically connected；

Described DO determination control system includes 1 online DO determination instrument and 1 set of aeration subsystem, described Online DO determination instrument include electrical connection dissolved oxygen electrode 26 and online dissolved oxygen instrument 18, described dissolved oxygen electrode 26 are located between the water side of BAF 23 and the water inlet end of the first two level anoxic pond 28 in pipeline, dissolved oxygen electrode 26 Electrically connected with the output end of online dissolved oxygen instrument 18, the input of described online dissolved oxygen instrument 18 electrically connects with PLC 35；

A total of 3 sets of described aeration subsystem, often cover aeration head 11, gas stream that aeration subsystem includes being sequentially connected Gauge 15, aeration pump 16 and frequency converter 17, pass through gas piping phase between aeration head 11, gas flowmeter 15 and aeration pump 16 Even, aeration pump 16 is connected with the power output end of frequency converter 17；The power input of frequency converter 17 in 3 sets of aeration subsystems End electrically connects with PLC 35；The aeration head 11 wherein belonged in the aeration subsystem of oxidation reduction potential determination control system divides Not She Yu the quick aeration tank 10 of one-level and the quick bottom of aeration tank 30 of two level, belong to the aeration subsystem of DO determination control system Aeration head 11 in system is located at the bottom of BAF 23；

Described PLC 35 is connected with computer 36.

Described the first anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, the quick aeration tank 10 of one-level, aeration and biological filter Pond 23, the first two level anoxic pond 28, the second two level anoxic pond 29 and the quick aeration tank 30 of two level are both needed to keep certain sealing shape State, outside air is avoided to enter as far as possible；

Due to avoid air from largely entering, influenceing reaction environment, the first described anaerobic pond 3, the second anaerobic pond 5, one Level anoxic pond 9, the quick aeration tank 10 of one-level, BAF 23, the first two level anoxic pond 28, the and of the second two level anoxic pond 29 The quick top of aeration tank 30 of two level has lid to seal, and is provided with the blast pipe 8 with air bleeding valve；

It is that the first described anaerobic pond 3, the second anaerobic pond 5 and the top of one-level anoxic pond 9 are closed it is advantageous to scheme, first Anaerobic pond 3, the second anaerobic pond 5 are connected with the air chamber of one-level anoxic pond 9, are outwards vented by the air bleeding valve in one-level anoxic pond 9；

The quick top of aeration tank 10 of described one-level is closed, is outwards arranged by the air bleeding valve on the quick aeration tank 10 of one-level Gas；

The described top of BAF 23 is closed, is outwards vented by the air bleeding valve on BAF 23；

Described the first two level anoxic pond 28 and the top of the second two level anoxic pond 29 are closed, the first two level anoxic pond 28 and the The air chamber of two two level anoxic ponds 29 is connected, and is outwards vented by the air bleeding valve in two level anoxic pond 29；

The quick top of aeration tank 30 of described two level is closed, is outwards arranged by the air bleeding valve on the quick aeration tank 30 of two level Gas.

The reading water side of the second anaerobic pond 5, the water side of the quick aeration tank 10 of one-level, the second two level lack PLC35 online The redox electricity that the on-line oxidation reduction potential instrument 7 of the water side of the water side in oxygen pond 29 and the quick aeration tank 30 of two level measures Place value, PLC35 control the power supply output frequency of frequency converter 17 according to the control range of setting, change corresponding aeration pump 16 Aeration quantity, realize to the second anaerobic pond 5, the quick aeration tank 10 of one-level, the second two level anoxic pond 29 and the quick aeration tank 30 of two level Redox position control.The aeration quantity of the quick aeration tank 10 of PLC35 adjustment one-levels can realize the quick aeration tank 10 of one-level The oxidation-reduction potential of aeration tank 30 quick with two level reaches the control range of setting.The quick aeration tank 30 of PLC adjustment two levels Aeration quantity can realize that the oxidation-reduction potential of the second anaerobic pond 5 and the quick aeration tank 30 of two level reaches the control range of setting.

PLC35 reads the dissolved oxygen concentration for the water side of BAF 23 that online dissolved oxygen instrument 18 is measured to, according to The dissolved oxygen control range of present apparatus setting, the power supply output frequency of frequency converter 17 is adjusted, changes and is aerated in BAF The aeration quantity of pump 16, to realize the control to the water outlet dissolved oxygen of BAF 23.

As present invention further optimization scheme, between PLC 35 and on-line oxidation reduction potential meter 7, PLC 35 with become Electrical connection between frequency device 17 and between PLC 35 and online dissolved oxygen instrument 18 is connected by communication using 485.

As present invention further optimization scheme, the top of BAF 23 is cylinder type, and bottom is with diameter Cone angle is 60 degree of turbination, joint horizontally disposed stainless steel sieve tray 14, the mesh size 5mm of circular cone and cylinder, is sieved Filler is loaded on orifice plate 14 and forms packing layer 39, packing material size 0.6-1.5cm；Water distributor 38 is provided with directly over packing layer 39, Water distributor 38 is connected with the water inlet end of BAF 23, and water distributor 38 is used to ensure uniformly to intake, aeration and biological filter The water level in pond 23 is typically slightly above packing layer 39；Aeration head 11 in BAF 23 is arranged on the top of sieve tray 14, exposes The distance of gas first 11 and sieve tray 14 is the 1/3 of the thickness of packing layer 39；

Described filler is filler such as volcanic rock, haydite, the quartz sand of volcanic rock or the easy apposition growth of other microorganisms Or zeolite etc..Nitrifier is mainly adhered on filler surface, when water to it is dirty when, the top of aeration head 11 because aeration aerating effect just Aeration nitrification zone is formd, the lower section of aeration head 11 is not because have aeration to be formed deoxidation nitrification zone.

As present invention further optimization scheme, the water side of BAF 23 also passes through draining pump 24 and cleaning The arrival end in discharge pond 27 is connected, and the top in cleaning discharge pond 27 returns to entering for pump 25 and BAF 23 by supernatant Water end (W.E.) is connected；The bottom mud discharging mouth in cleaning discharge pond 27 returns to pump 21 and the water inlet of the top of one-level anoxic pond 9 by cleaning sludge End is connected；Wherein, between the water side of BAF 23 and draining pump 24, supernatant returns to pump 25 and BAF Between 23 and cleaning discharge pond 27 and cleaning sludge are equipped with magnetic valve 22 between returning to pump 21, for pipeline where controlling it Opening and closing.

Because sludge in packing layer 39 or the filler to come off accumulation are more, the release of phosphorus, reply aeration and biological filter can be caused Pond 23 is cleaned.The method of cleaning：Method of the BAF 23 by draining pump 24 using downward rapid deflation, will expose The filler to be come off in gas biofilter 23 is washed into cleaning discharge pond 27, and carries out quiescent settling, by the supernatant after sedimentation Pump 25 is returned to supernatant to return in BAF 23.The sludge of sedimentation can return to one-level by cleaning sludge return pump 21 Anoxic pond 9, it is the sludge additional nitration bacterium in the present apparatus.

As present invention further optimization scheme, the top of BAF 23 is aeration and biological by pipeline and not The aeration pump 16 that filter tank 23 provides other two sets of aerations subsystem of gas is connected.The top of BAF 23 is used The relatively low air of oxygen concentration can be used as the aeration pump 16 of the quick aeration tank 10 of one-level and the quick aeration tank 30 of two level by pipeline Gas source, for secondary aeration.The quick aeration tank 10 of one-level and the quick aeration tank 30 of two level pass through this low-oxygen aeration side Formula discharges nitrogen, improves one-level settling tank 12, the sludge settling property of two level settling tank 34, while promote aerobic phosphorus absorption by being aerated Effect, avoid excessive anaerobism from producing the secondary release of phosphorus, strengthen the oxidative nitration to ammonia nitrogen, reduce ammonia nitrogen concentration.When water inlet Carbon-nitrogen ratio is very high（6.5-14）When, or when the quick aeration quantity of aeration tank 30 of two level is larger, one-level can be quickly aerated The gas source of the aeration pump 16 of the quick aeration tank 30 of aeration pump and two level in pond 10 directly switches to normal air.

A kind of continuous flow double sludge denitrification denitrification dephosphorization technique, it is continuous using the above-mentioned AAONAO based on On-line Control Double sludge denitrification advanced nitrogen dephosphorization apparatus is flowed, is comprised the concrete steps that：

Sewage enters the first anaerobic pond 3 and the second anaerobic pond 5 through intake pump 1, and sludge returns to pump 32 by sludge and enters first It is sufficiently mixed in the presence of submersible agitator 4 with sewage after the anaerobic pond 5 of anaerobic pond 3 and second, is released under anaerobic Phosphorus is put, the end of the second anaerobic pond 5 sets oxidation-reduction electrode 6 progress entirely reacted is monitored and controlled；

After anaerobic reaction terminates, mud mixed liquid flows into one-level anoxic pond 9 from the second anaerobic pond 5, with being filtered from aeration and biological The nitrification liquid that the return of pump 20 is returned by aeration tank nitrification liquid that pond 23 is flowed out fully is mixed in the presence of submersible agitator 4 Close, carry out first time denitrification denitrogenation and inhale phosphorus reaction；

After first time denitrification denitrogenation and suction phosphorus reaction terminate, then mud mixed liquid flows into the quick aeration tank 10 of one-level, Carry out the nitration reaction of aerobic phosphorus absorption, nitrogen stripping and ammonia nitrogen；The quick end of 10 and second two level anoxic pond of aeration tank 29 of one-level Oxidation-reduction electrode 6 is set and configures corresponding on-line oxidation determination by reduction instrument 7, PLC35 changes aeration pump by frequency converter 17 16 aeration quantity controls the oxidation-reduction potential of the quick two level anoxic pond 29 of aeration tank 10 and second of one-level in the scope of setting It is interior, so that the anti-nitre of the aerobic phosphorus absorption of the quick aeration tank 10 of one-level, the first two level anoxic pond 28 and the second two level anoxic pond 29 Change denitrogenation and denitrifying phosphorus uptake reaction controlling in optimal state；

Afterwards, the mud mixed liquid flowed out from the quick aeration tank 10 of one-level flows into one-level settling tank 12, one-level settling tank 12 The supernatant that sedimentation separation comes out flows into BAF 23, carries out nitration reaction, obtains nitrification liquid；Dissolved oxygen electrode 26 exists Line detects the change of water dissolved oxygen, and the nitrification liquid by controlling aeration control to be flowed out from BAF 23 dissolves Oxygen concentration is between 0.6-1.0mg/L, it is ensured that ammonia nitrogen almost all is converted into nitrate anion and nitrite anions, while avoids again Excessive oxygen, which enters denitrification pond, influences anti-nitration reaction；

A nitrification liquid part returns to one-level anoxic pond 9 with aeration tank nitrification liquid return pump 20 and carries out anti-nitration reaction, separately A part of nitrification liquid is flowed into the first two level anoxic pond 28；The sludge that one-level settling tank 12 settles surmounts pump 19 through sludge and is delivered to The nitrification liquid flowed into first two level anoxic pond 28 with BAF 23 and leading to from the quick outflow of aeration tank 30 of two level Cross the mud mixed liquid that mud mixed liquid return pump 31 returns to be sufficiently mixed in the presence of submersible agitator 4, first In the two level anoxic pond 29 of two level anoxic pond 28 and second, and carry out second of anti-nitration reaction；The dirt that one-level settling tank 12 settles Mud surmounts pump 19 by sludge, has surmounted BAF 23 and has been fed directly to the first two level anoxic pond 28, not by nitre Change process, surmount sludge so crying.It is characterized in that：Because surmounting sludge does not pass through BAF, wherein having carried secretly few Amount ammonia nitrogen entered directly into behind secondary anoxic pond in, the clean-up effect of apparatus of the present invention total nitrogen can be influenceed.

After second of anti-nitration reaction terminates, mud mixed liquid flows into the quick aeration tank of two level from the second two level anoxic pond 29 30 fully carry out the nitration reaction of aerobic phosphorus absorption, nitrogen stripping and remaining ammonia nitrogen in the presence of submersible agitator 4；In two level The oxidation-reduction electrode 6 and configure corresponding on-line oxidation reduction potential analyzer 7 that the end of quick aeration tank 30 is set, pass through On-line monitoring and the oxidation-reduction potential of the quick aeration tank 30 of control two level, to ensure that the purification of water outlet phosphorus and nitrogen reaches design Standard, while the anaerobic phosphorus release of anaerobic pond and the redox control of one-level anoxic pond are not influenceed.

Finally, pump 31 is returned to by mud mixed liquid from the mud mixed liquid part that the quick aeration tank 30 of two level is flowed out to return It is back to the first two level anoxic pond 28 and carries out denitrification, another part then flows directly into two level settling tank 34 and settled, and settles Supernatant afterwards is discharged as scavenging solution from drainpipe 37；Partial sludge returns to pump 32 by sludge and enters sludge after sedimentation The first anaerobic pond 3 is returned in recurrent canal 2 and starts new circulation, another part sludge is fixed with sludge pump 33 as excess sludge Amount is discharged to outside device；

Wherein, mud mixed liquid is in each pond residence time：First anaerobic pond and the second anaerobic pond have 1-2.5h altogether, and one-level lacks Oxygen pond 0.5-1.5h, the quick aeration tank 0.2-1h of one-level, the first two level anoxic pond and the second two level anoxic pond have 1-2.5h altogether, and two The quick aeration tank 0.5-1.5h of level；

One-level settling tank supernatant is 1-5h in the BAF residence time；

The gas-water ratio of BAF is：10-40；

When water inlet carbon-nitrogen ratio is 6.5-14, when carbon-phosphorus ratio is more than 50, each reaction tank of oxidation reduction potential control system aoxidizes Reduction potential control range：Second anaerobic pond<- 300mv, quick aeration tank -250 ~ -140mv of one-level, the second two level anoxic pond - 160 ~ -100mv, quick aeration tank+50 ~+120mv of two level；

When water inlet carbon-nitrogen ratio is 4.5-6.5, when carbon-phosphorus ratio is more than 50, each reaction tank of oxidation reduction potential control system aoxidizes Reduction potential control range：Second anaerobic pond<- 300mv, quick aeration tank -200 ~ -120mv of one-level, the second two level anoxic pond - 150 ~ -50mv, the quick 0 ~+90mv of aeration tank of two level.

Sludge retention time in the present apparatus is 10-17 days.

Application example 1

Apparatus of the present invention seed sludge is derived from Kunming sewage treatment plant, and domestication one week is carried out with domestic sewage from campus, Incipient stage, nitrification ability was weaker, and part ammonia nitrogen directly flows out from the present apparatus because BAF nitrobacteria is less, The denitrifying capacity of activated sludge is also relatively weak, and substantial amounts of organic matter is not absorbed by activated sludge and denitrification utilizes, and Enter directly into BAF, consume the oxygen of BAF, influence the oxidative nitration of ammonia nitrogen, therefore tame rank Section could promote nitrobacteria to promote ammonia nitrogen energy in the growth and breeding of biofilter by increasing the aeration quantity of BAF In the complete nitrification of BAF.So after the enhanced aeration domestication of 10 days or so, the big portion of organic matter in sewage Point utilized by sludge absorption and sorption and denitrification, seldom traverse to BAF, at this moment nitrification tank BAF Required aeration quantity is gradually lowered, and ammonia nitrogen can be all oxidized to nitrate anion and nitrite anions, at this time the present apparatus The dissolved oxygen concentration of control nitrification liquid outlet ensures that the complete nitrification of ammonia nitrogen in a relatively low scope, ensures denitrification Be normally carried out.

After the culture and domestication of 10 days, by commissioning test, the optimum controling range of each control parameter is determined.When entering The fluctuation of water water quality carbon-nitrogen ratio is smaller, can realize stable operation for a long time under fixed control parameter, realize advanced nitrogen dephosphorization. , it is necessary to which administrative staff manually determine optimal control condition by test when if water quality and carbon-nitrogen ratio change larger.

BAF dissolved oxygen control range：In order that ammonia nitrogen is all oxidized to nitrate anion and nitrite anions, More dissolved oxygen is not set to enter in one-level, two level anoxic pond simultaneously, interference denitrification and consumption organic matter.Dissolved oxygen controls In 0.6-0.8mg/L, at this moment the ammonia nitrogen concentration of effluent of aeration biological filter is respectively less than 0.2mg/L, realizes the complete nitre of ammonia nitrogen Change, ensure the clean-up effect of present apparatus total nitrogen.

Wherein, using flow rate pump of intaking as reference, each flow rate pump proportion：Intake pump 100%, aeration tank nitrification liquid return Pump 300%, sludge surmount flow rate pump 55%, and mud mixed liquid returns to flow rate pump 200%, and sludge returns to flow rate pump 100%；

The present apparatus each reaction tank residence time, the first anaerobic pond and the second anaerobic pond have 1.5h altogether, one-level anoxic pond 1h, and one The quick aeration tank 0.3h of level, the first two level anoxic pond and the second two level anoxic pond have 2h, the quick aeration tank 1h of two level altogether.

One-level settling tank supernatant is 2h in the BAF residence time.Each reaction tank oxidation reduction potential control model Enclose：Second anaerobic pond<- 350mv, one-level quick aeration tank-200-- 190mv, the second two level anoxic pond-120-- 150mv, two Quick aeration tank+110 -+120mv of level.

Residence time control of the sludge in the present apparatus was at 14 days or so, one-level anoxic pond, the first anaerobic pond, the second anaerobism The sludge concentration in pond, the first two level anoxic pond and the second two level anoxic pond is controlled in the range of 2500mg/L ~ 3000mg/L；

By continuous bimestrial normal operation, when domestic sewage from campus influent COD cr is 351-826mg/L, total nitrogen is 51-69mg/L, in the range of carbon-nitrogen ratio is 6.9-12, when total phosphorus is 6.3-8.6mg/L scopes, nitric efficiency is substantially all in 98- Between 99%, dephosphorization efficiency is substantially between 96.9-98.2%, between CODcr purification efficiency 92.5-94.6%.TN water outlet is dense Between degree only has 0.65-0.9, wherein ammonia nitrogen is 0.1-0.25mg/L, and nitrate anion is between 0.3-0.6mg/L, the water outlet of total phosphorus Concentration only has 0.1- 0.28mg/L.The TN of obvious water outlet reaches the class above water quality of surface water 3, ammonia nitrogen reach the class water quality of surface water 2, TP basically reaches the class above water quality of surface water 4 and CODcr reaches surface water one kind above water quality, is successfully realized to campus life The target of one step deep purifying of sewage.

Application example 2

Apparatus of the present invention seed sludge is derived from Kunming sewage treatment plant, and domestication one is carried out with manual simulation's sanitary sewage In week, the incipient stage, nitrification ability was weaker, and part ammonia nitrogen directly flows from the present apparatus because BAF nitrobacteria is less Go out, the denitrifying capacity of activated sludge is also relatively weak, and substantial amounts of organic matter is not by activated sludge absorption and sorption and denitrification Utilize, and enter directly into BAF, consume the oxygen of BAF, influence the oxidative nitration of ammonia nitrogen.Cause This, the domestication stage could promote nitrobacteria in the growth and breeding of biofilter by increasing the aeration quantity of BAF, Enable ammonia nitrogen in biofilter exhaustive oxidation.So after the enhanced aeration domestication of 10 days or so, the exposure of BAF Tolerance is gradually lowered, and ammonia nitrogen can be all oxidized to nitrate anion and nitrite anions, at this time present apparatus control nitrification The dissolved oxygen of liquid outlet ensures that the complete nitrification of ammonia nitrogen in a relatively low scope, ensures denitrifying be normally carried out.

After the culture and domestication of 10 days, then the commissioning test by control parameter, determine the optimal of each control parameter Control range, present apparatus can just can normal operations.

BAF dissolved oxygen control range：In order that ammonia nitrogen is completely converted into nitrate anion and nitrite anions, simultaneously More dissolved oxygen is not set to enter in anoxic denitrification ponds at different levels, interference denitrification and consumption organic matter.Dissolved oxygen control exists 0.5-0.7mg/L, at this moment the ammonia nitrogen concentration of effluent of aeration biological filter be respectively less than 0.2mg/L, realize the complete nitrification of ammonia nitrogen, Ensure the clean-up effect of present apparatus total nitrogen.

Simulated domestic wastewater is mainly by starch, glucose, peptone, somatose cream, urea, ammonium sulfate, tertiary sodium phosphate etc. Composition is formulated, and its CODcr is 251-520mg/L, total nitrogen 35-55mg/L, in the range of carbon-nitrogen ratio is 6.5-11.5, always Phosphorus is 5.5-9mg/L；

Wherein, using flow rate pump of intaking as reference, each flow rate pump proportion：Intake pump 100%, aeration tank nitrification liquid return Pump 300%, sludge surmount flow rate pump 60%, and mud mixed liquid returns to flow rate pump 100%, and sludge returns to flow rate pump 100%；

Mud mixed liquid has 1.5h, one-level anoxic altogether in each reaction tank residence time, the first anaerobic pond and the second anaerobic pond Pond 1h, the quick aeration tank 0.3h of one-level, the first two level anoxic pond and the second two level anoxic pond have 2h, the quick aeration tank of two level altogether 1h。

One-level settling tank supernatant is 2.5h in the BAF residence time.

Each reaction tank oxidation reduction potential control scope：Second anaerobic pond<- 350mv, the quick aeration tank -200 of one-level-- 190mv, the second two level-120-- 150mv of anoxic pond, quick aeration tank+90 -+100mv of two level.

Residence time control of the sludge in device was at 12 days or so, one-level anoxic pond, the first anaerobic pond, the second anaerobism The sludge concentration in pond, the first two level anoxic pond and the second two level anoxic pond is controlled in the range of 2000mg/L ~ 3000mg/L；

By continuous bimestrial normal operation, when domestic sewage from campus water inlet nitric efficiency substantially all 98-99% it Between, dephosphorization efficiency is substantially between 96.0-98.1%, between CODcr purification efficiency 91.8-95.0%.TN aqueous concentration is only Between having 0.65-0.8, wherein ammonia nitrogen is 0.1-0.25mg/L, and nitrate anion is between 0.25-0.5mg/L, the aqueous concentration of total phosphorus Only 0.05- 0.3mg/L.The TN of obvious water outlet reaches the class above water quality of surface water 3, and ammonia nitrogen reaches the class water quality of surface water 2, TP bases Originally reach the class above water quality of surface water 4 and CODcr reaches surface water one kind above water quality, be successfully realized to simulated domestic wastewater A step deep purifying target.

Compared using the inventive method and other existing methods, as a result as shown in table 1.

Table 1

Wherein, BCFS techniques are the results to Dutch holdon sewage plants sewage disposal.BCFS is to Dutch dolfshen The result of sewage plant sewage disposal.Remaining technique is the result to city domestic sewage processing.From table 1, the inventive method With good nitric efficiency and dephosphorization efficiency, and effect is superior to other existing forward position techniques.

Above content is to combine the further description that specific preferred embodiment is done to the present invention, is easy to this skill Art those skilled in the art is understood that and using the present invention, it is impossible to assert that the specific implementation of the present invention is only limited to and is said with these It is bright.For those skilled in the art, without departing from the inventive concept of the premise, it can also make Some simple deductions and replacement, without by performing creative labour.Therefore, those skilled in the art's taking off according to the present invention Show, the improvement made to the present invention all should be within protection scope of the present invention.

Claims

A kind of 1. AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, it is characterised in that Including anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, one-level settling tank, BAF, two level anoxic pond, two level Quick aeration tank, two level settling tank, oxidation reduction potential determination control system, DO determination control system, aeration subsystem, PLC and computer；

Anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level and one-level settling tank are sequentially connected by pipeline, aeration and biological filter Pond, two level anoxic pond, the quick aeration tank of two level and two level settling tank are sequentially connected by pipeline, one-level settling tank supernatant water outlet End is connected by pipeline with water inlet end above BAF；

The bottom mud discharging mouth of one-level settling tank surmounts pump by sludge and is connected with the water inlet end of two level anoxic pond；

The water side of the quick aeration tank of described two level also returns to pump and the water inlet end phase of two level anoxic pond by mud mixed liquid Even；

The water side of described BAF also returns to pump and the water inlet end phase of one-level anoxic pond by aeration tank nitrification liquid Even；

The water inlet end of anaerobic pond is provided with intake pump；

It is equipped with described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, two level anoxic pond and the quick aeration tank of two level Submersible agitator；

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, two level anoxic pond and two level are quick Aeration tank is sealed, and the quick aeration tank of one-level anoxic pond, one-level, BAF, two level anoxic pond and two level are quickly aerated The blast pipe with air bleeding valve is equipped with the top of pond；Anaerobic pond is connected with the air chamber of one-level anoxic pond；

The top of described two level settling tank is provided with drainpipe；The bottom mud discharging mouth of two level settling tank returns to pump with detesting by sludge The water inlet end in oxygen pond is connected；The bottom mud discharging mouth of two level settling tank is also connected with sludge pump；

Mud scraper is equipped with described one-level settling tank and two level settling tank；

Described oxidation reduction potential determination control system includes 4 on-line oxidation reduction potential determining instruments and 2 sets of aeration System, every oxidation reduction potential determination instrument include the oxidation-reduction electrode and on-line oxidation reduction potential meter of electrical connection；4 sets The oxidation-reduction electrode of oxidation reduction potential determination instrument is respectively arranged on the water outlet of the water side of anaerobic pond, the quick aeration tank of one-level The water side at end, the water side of two level anoxic pond and the quick aeration tank of two level；It is online in 4 sets of oxidation reduction potential determination instruments The corresponding oxidation-reduction electrode electrical connection in oxidation-reduction potentiometer one end, the other end electrically connect with PLC；

Described DO determination control system includes 1 online DO determination instrument and 1 set and is aerated subsystem, it is described Line DO determination instrument includes the dissolved oxygen electrode of electrical connection and online dissolved oxygen instrument, and described dissolved oxygen electrode is located at aeration Between the water side of biofilter and the water inlet end of two level anoxic pond in pipeline, the output of dissolved oxygen electrode and online dissolved oxygen instrument End electrical connection, the input of described online dissolved oxygen instrument electrically connect with PLC；

Described often set aeration subsystem includes aeration head, gas flowmeter, aeration pump and the frequency converter being sequentially connected, aeration pump It is connected with the power output end of frequency converter；The power input of frequency converter in 3 sets of aeration subsystems electrically connects with PLC； The aeration head belonged in the aeration subsystem of oxidation reduction potential determination control system is respectively arranged on the quick aeration tank of one-level and two The quick aeration tank bottom of level, the aeration head belonged in the aeration subsystem of DO determination control system are located at BAF Bottom；

Described PLC is connected with computer.
2. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that described anaerobic pond is in series by multiple ponds.
3. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that described two level anoxic pond is in series by multiple ponds.
4. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that described anaerobic pond is that two ponds are in series, and one-level anoxic pond is single pond, and the quick aeration tank of one-level is Dan Chi, two level anoxic pond are that two ponds are connected, and the quick aeration tank of two level is single pond.
5. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that between described PLC and on-line oxidation reduction potential meter, between PLC and frequency converter, PLC with it is online Electrical connection between dissolved oxygen instrument and between PLC and computer is connected by communication using 485.
6. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that BAF top is cylinder type, and bottom is the turbination that the cone angle of same diameter is 60 degree, circle Cone and the joint of cylinder are horizontally disposed with stainless steel sieve tray, mesh size 5mm, and loading filler on sieve tray forms packing layer, Packing material size is 0.6-1.5cm；Water distributor is provided with directly over packing layer, water distributor is connected with the water inlet end of BAF It is logical；Aeration head in BAF is arranged on above sieve tray, and the distance of aeration head and sieve tray is packing layer thickness 1/3；

Wherein, described filler is volcanic rock, haydite, quartz sand or zeolite.
7. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control To put, it is characterised in that the arrival end that pond is also discharged in the water side of described BAF by draining pump with cleaning is connected, The top in cleaning discharge pond returns to pump by supernatant and is connected with the water inlet end of BAF；The bottom row in cleaning discharge pond Mud mouth is connected by cleaning sludge return pump with the water inlet end of one-level anoxic pond；Wherein, the water side of BAF and row Between water pump, supernatant returns between pump and BAF and cleaning is discharged and is all provided between pond and cleaning sludge return pump There is magnetic valve.
8. the AAONAO continuous flow double sludge denitrification advanced nitrogens dephosphorization dress according to claim 1 based on On-line Control Put, it is characterised in that the top of described BAF and other two sets of exposures that gas is not provided for BAF The inlet end of the aeration pump of gas subsystem is connected.
9. a kind of continuous flow double sludge denitrification denitrification dephosphorization technique, using described in claim 1 based on On-line Control AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, it is characterised in that comprise the concrete steps that：

Sewage enters anaerobic pond through intake pump, and sludge is entered after anaerobic pond by sludge return pump to be mixed with sewage, in anaerobism Under the conditions of discharge phosphorus, anaerobic pond end sets oxidation-reduction electrode the progress reacted in anaerobic pond is monitored and controlled；

After anaerobic reaction terminates, mud mixed liquid flows into one-level anoxic pond, passes through aeration tank with what is flowed out from BAF Nitrification liquid returns to the nitrification liquid that pump returns and mixed, and carries out first time denitrification denitrogenation and inhales phosphorus reaction；

After first time anti-nitration reaction denitrogenation and suction phosphorus terminate, mud mixed liquid flows into the quick aeration tank of one-level, carries out aerobic suction The nitration reaction of phosphorus, nitrogen stripping and ammonia nitrogen, pass through the redox electricity installed in the quick aeration tank of one-level and two level anoxic pond The measurement result of pole controls the aeration quantity of the quick aeration tank of one-level, to cause the oxygen of the quick aeration tank of one-level and two level anoxic pond Change reduction potential control range to meet the requirements；

Afterwards, one-level settling tank is flowed into from the mud mixed liquid of the quick aeration tank outflow of one-level, one-level settling tank sedimentation separation goes out The supernatant come flows into BAF, carries out nitration reaction, obtains nitrification liquid；Dissolved oxygen electrode on-line monitoring water outlet dissolving The change of oxygen, and by controlling the nitrification liquid dissolved oxygen concentration that aeration control flows out from BAF in 0.5- Between 1.0mg/L, whole nitrifications of ammonia nitrogen are realized；

A nitrification liquid part returns to one-level anoxic pond with aeration tank nitrification liquid return pump and carries out anti-nitration reaction, another part nitre Change liquid stream and enter two level anoxic pond；The sludge of one-level settling tank sedimentation surmounts pump through sludge and is delivered in two level anoxic pond, with aeration The nitrification liquid and the sludge that pump return is returned by mud mixed liquid from the quick aeration tank outflow of two level that biofilter flows into Mixed liquor is mixed, and carries out second of anti-nitration reaction；

After second of anti-nitration reaction terminates, mud mixed liquid flows into the quick aeration tank of two level from two level anoxic pond and carries out aerobic suction The nitration reaction of phosphorus, nitrogen stripping and remaining ammonia nitrogen；Exist in the oxidation-reduction electrode that the end of the quick aeration tank of two level is set The oxidation-reduction potential of the quick aeration tank of two level is monitored and controlled in line；

Finally, pump is returned to by mud mixed liquid from a mud mixed liquid part for the quick aeration tank outflow of two level and is back to two level Anoxic pond carries out denitrification, and another part then flows directly into two level settling tank and settled, and the supernatant after sedimentation is as net Change liquid discharge；Partial sludge returns to pump by sludge and returns to anaerobic pond and start new circulation, another part sludge after sedimentation Quantitatively it is discharged to as excess sludge with sludge pump outside the present apparatus；

Wherein, mud mixed liquid is in each pond residence time：Anaerobic pond 1-2.5h, one-level anoxic pond 0.5-1.5h, one-level quickly expose Gas pond 0.2-1h, two level anoxic pond 1-2.5h, the quick aeration tank 0.5-1.5h of two level；

One-level settling tank supernatant is 1-5h in the BAF residence time；

The gas-water ratio of BAF is：10-40；

The sludge concentration of anaerobic pond, one-level anoxic pond and two level anoxic pond is controlled in the range of 2000mg/L ~ 5000mg/L；

When water inlet carbon-nitrogen ratio be 6.5-14, when carbon-phosphorus ratio is more than 50, using flow rate pump of intaking as reference, each flow rate pump ratio of the present apparatus Scope：Intake pump 100%, aeration tank nitrification liquid return to pump 200%-400%, and sludge surmounts flow rate pump 40%-80%, mud mixed liquid Flow rate pump 100%-200% is returned to, sludge returns to flow rate pump 50%-150%；

When water inlet carbon-nitrogen ratio be 4.5-6.5, when carbon-phosphorus ratio is more than 50, wherein, using flow rate pump of intaking as reference, each pump stream of the present apparatus Fast proportion：Intake pump 100%, aeration tank nitrification liquid return to pump 100%-300%, and sludge surmounts flow rate pump 40%-80%, sludge Mixed liquor returns to flow rate pump 0%, and sludge returns to flow rate pump 50%-150%；

When water inlet carbon-nitrogen ratio be 6.5-14, when carbon-phosphorus ratio is more than 50, each reaction tank redox of oxidation reduction potential control system Control of Electric potentials scope：Anaerobic pond<- 300mv, quick aeration tank -250 ~ -140mv of one-level, two level anoxic pond -160 ~ -100mv, two Quick aeration tank+50 ~+120mv of level；

When water inlet carbon-nitrogen ratio be 4.5-6.5, when carbon-phosphorus ratio is more than 50, each reaction tank redox of oxidation reduction potential control system Control of Electric potentials scope：Anaerobic pond<- 300mv, quick aeration tank -200 ~ -120mv of one-level, two level anoxic pond -150 ~ -50mv, two The quick 0 ~+90mv of aeration tank of level.
10. continuous flow double sludge denitrification denitrification dephosphorization technique according to claim 9, it is characterised in that in the present apparatus Sludge retention time be 10-17 days.