CN205653231U - Two mud denitrification degree of depth nitrogen and phosphorus removal devices of continuous flow based on on -line control - Google Patents

Abstract

The utility model relates to a two mud denitrification degree of depth nitrogen and phosphorus removal devices of continuous flow based on on -line control, the device includes the equalizing basin, the anaerobism pond, the one -level sedimentation tank, bological aerated filter, the pond is selected to good oxygen oxygen deficiency, one -level oxygen deficiency pond, the one -level aeration tank, second grade oxygen deficiency pond, the second grade aeration tank, the second grade sedimentation tank, the clean water basin, oxidation reduction potential determination control system, dissolved oxygen determination control system, aeration systems, nitrify terminal point control system, go out water positive phosphoric acid root survey control system and industry control computer, the device is based on two mud denitrification dephosphorization principles, has utilized the anaerobism to release control and the oxido reduction potential control that the secondary settlement of phosphorus, mud, the mud segmentation surmounts, denitrification inhales phosphorus, phosphorus is inhaled to good oxygen, the terminal point is nitrified to the continuous flow aeration tank the low ammonia nitrogen of control technique, hypoxemia nitrify liquid and has controlled techniques such as looks combined control system with going out water positive phosphoric acid root, has realized the degree of depth nitrogen and phosphorus removal's of sewage effect.

Description

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control

Technical field

This utility model belongs to technical field of sewage, relate to the advanced nitrogen dephosphorization purifying device of one way of life sewage, be suitable for Sewage Plant grassroot project, be specifically related to a kind of based under on-line monitoring and control, according to denitrification nitrogen and phosphorus removal principle, carry out the device of secondary denitrification nitrogen and phosphorus removal.

Background technology

At present, in " urban wastewater treatment firm pollutant emission standard " that China implements, the highest one-level emission standard A just corresponds to bad five classes of surface water, domestic current Sewage Plant prevailing technology is mainly two stage treatment such as AB method, oxidation ditch process, A/O technique, A/A/O technique, SBR method etc., and these techniques obviously cannot realize the nitrogen phosphorus of the degree of depth and purify.Therefore, even if rain dirt shunting, the perfect condition that sanitary sewage processes entirely are all implemented in various places, the purpose reaching to improve and repair urban water-body still it is difficult to.These Sewage Plant are discharged bad five class water and are worked the mischief ecology and the view of surface water, affect water body and use function, the water quality of subsoil water is caused potential threat.Along with the requirement of people's quality of water environment to producing and living is more and more higher, wastewater treatment in China discharge standard will gradually integrate with surface water quality grade.The investment high due to the tertiary treatment process of sewage and high processing cost, be difficult to promote on a large scale.Therefore, the research of by biochemical treatment, sewage is directly reached the surface water 5 above water standard of class new technology and new technique is by being one of fundamental solution solving China's water environment pollution problem, is also present stage Study on Water Pollution Control focus and emphasis.

In recent years, automatic control technology is developed rapidly and is widely used, but sewage treatment process controls technology, owing to relating to the complex conditions of multiparameter multi-environment change, also it is in the primary stage of research and development, especially while the rarely found report of control technique of denitrogenation dephosphorizing.Using computer to carry out accurate terminal and process control in sewage treatment process, maintain the optimum condition condition of denitrogenation dephosphorizing, the advanced nitrogen dephosphorization for sewage disposal has great importance.

Double sludge denitrification denitrification dephosphorization technique is a kind of sewage treatment process that can simultaneously take into account denitrogenation and dephosphorization, and two kinds of microorganisms of nitrification and denitrification are divided among suitable environment and cultivate by this technique.Utilize the organic carbon source in sewage fully, by being constantly enriched with DPAOs under anaerobic/anoxic alternation condition, under anaerobic utilize in former water VFAs to synthesize internal carbon source PHA, and under anoxic conditions with nitrate for electron acceptor oxidation Decomposition body in PHA complete excess and inhale phosphorus reaction.This makes denitrogenation and dephosphorization can synchronize to be removed, solve the problem using traditional method to domestic sewage denitrifying-dephosphorizing carbon source deficiency, have efficiently, the feature such as low energy consumption, sludge output be low, be the most concerned, the most promising a kind of Advance in New Technology of Biological Nutrient Removal.Double sludge denitrification denitrogenation dephosphorizing main representative technique is A2N and Dephanox technique.

Existing continuous flow double sludge denitrification denitrification dephosphorization technique has a following two shortcoming: first, owing to surmounting a large amount of ammonia nitrogens that mud carries so that water outlet ammonia nitrogen and nitrate concentration are higher, are difficulty with the denitrogenation dephosphorizing of the degree of depth；Second, second pond mud is susceptible to denitrification generation nitrogen affects the sedimentation of mud, and influent quality changes and influences whether the treatment effect of sewage, causes effluent quality unstable.3rd, existing double sludge denitrification denitrification dephosphorization technique is the highest due to automatic controlling level, is suitable only for process carbon-nitrogen ratio sewage in particular range, and when carbon-nitrogen ratio generation large change, effluent quality is difficult to ensure.

Therefore, how to improve the clean-up effect of nitrogen phosphorus and how to solve the situation that effluent quality is unstable, being the current double sludge denitrification denitrogenation dephosphorizing sewage treatment process problem of needing solution badly.

Utility model content

nullThis utility model cannot realize advanced nitrogen dephosphorization for denitrification nitrogen and phosphorus removal techniques such as existing A2N and Dephanox，The problem that effluent quality is unstable，A kind of ANSAOAO(Anaerobic-Nitrifying-Selective-Anoxic-Oxic-Anoxi c-Oxic is provided) continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus，This device is according to double sludge denitrification denitrogenation dephosphorizing principle，Based on On-line Control technology，Make use of anaerobic phosphorus release、The secondary settlement of mud、Mud segmentation surmounts denitrifying phosphorus uptake denitrogenation technology、Aerobic phosphorus absorption technology、Flow the control technology of Aeration tank nitrification terminal continuously、The control technology of hypoxia low Ammonia Nitrification liquid、And the denitrification dephosphorization technique that oxidation reduction potential control system is combined with water outlet orthophosphoric acid root control system，Achieve the effect of the advanced nitrogen dephosphorization of sanitary sewage.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, selects pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond, two-stage aeration tank, second-level settling pond, clear water reserviors, oxidation reduction potential determination control system, DO determination control system, nitrification terminal point control system, aerating system, water outlet orthophosphoric acid roots to measure control system and industrial PC including regulating reservoir, anaerobic pond, first stage precipitation tank, BAF, aerobic-anoxic；

The water inlet end of regulating reservoir connects water inlet pipe, and the water side of regulating reservoir is by being connected with the water inlet end of anaerobic pond with the pipeline of intake pump；The water side of anaerobic pond is connected by pipeline with the water inlet end of first stage precipitation tank；

First stage precipitation tank supernatant water side is connected with the water-locator above BAF by pipeline；

Discharge outlet bottom BAF is by selecting the water inlet end in pond to be connected with the pipeline of nitrification liquid normally open solenoid valve with aerobic-anoxic；

Aerobic-anoxic selects pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond, two-stage aeration tank, second-level settling ponds to be connected by pipeline successively order；

The supernatant water side of described second-level settling pond is connected with the water inlet end of clear water reserviors by pipeline；

The water side of clear water reserviors connects drain pipe；The lower section discharge outlet of clear water reserviors, backwash electromagnetic valve, backwashing pump are connected by pipeline successively order with BAF bottom discharge mouth；The pipeline with mud valve it is also associated with bottom BAF；

The bottom mud discharging mouth of second-level settling pond is connected with the water inlet end of anaerobic pond by returning the pipeline of pump with mud；The bottom mud discharging mouth of second-level settling pond is also connected with the pipeline with sludge pump；

The bottom mud discharging mouth of first stage precipitation tank selects the water inlet end in pond to be connected by surmounting the pipeline of pump with the first mud with aerobic-anoxic；The bottom mud discharging mouth of first stage precipitation tank is connected also by the water inlet end of the pipeline and two grades of anoxic pond surmounting pump with the second mud；

First mud surmounts the pipeline that pump and aerobic-anoxic select the water inlet end in pond to be connected and is provided with mud electromagnetic flowmeter, second mud surmounts and also is provided with mud electromagnetic flowmeter on the pipeline that the water inlet end of pump and two grades of anoxic pond is connected, and the communication ends of two mud electromagnetic flowmeters is all connected with industrial PC communication ends；Industrial PC surmounts pump by converter and the first mud the most respectively, the second mud surmounts pump and is connected；

It is equipped with submersible agitator in described regulating reservoir, anaerobic pond, aerobic-anoxic selection pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond and two-stage aeration tank；

Described regulating reservoir, anaerobic pond, aerobic-anoxic selection pond, one-level anoxic pond and two grades of anoxic pond all seal, and the top of the top of anaerobic pond, the aerobic-anoxic selection top in pond, the top of one-level anoxic pond and two grades of anoxic pond is equipped with exhaustor；For discharging the gas that anaerobic pond, one-level anoxic pond and two grades of anoxic pond produce.

Described oxidation reduction potential determination control system has four sets, and often set oxidation reduction potential determination control system includes oxidation-reduction electrode and the on-line oxidation reduction potential meter being connected；The oxidation-reduction electrode of 4 set oxidation reduction potential determination control systems is respectively arranged on the water side of anaerobic pond, the water side of one-level anoxic pond, the water side of two grades of anoxic pond and the water side of two-stage aeration tank；4 overlap the corresponding oxidation-reduction electrode in the on-line oxidation reduction potential meter one end in oxidation reduction potential determination control systems is connected, and the other end is connected with industrial PC communication ends；

Described DO determination control system includes the dissolved oxygen electrode that is connected and online dissolved oxygen instrument, described dissolved oxygen electrode is located at the water side of BAF and aerobic-anoxic selects between the water inlet end in pond in pipeline, dissolved oxygen electrode is connected with the outfan of online dissolved oxygen instrument, and the input of described online dissolved oxygen instrument is connected with industrial PC communication ends；

Described nitrification terminal point control system, including the pH electrode being connected and online pH analyzer, pH electrode is located at the water side of one-level Aeration tank；PH electrode is connected with the measurement signal end of online pH analyzer, and the communication ends of described online pH analyzer is connected with industrial PC communication ends；

Described aerating system has 4 sets, and often set aerating system includes aeration head, gas flowmeter, aeration pump and the converter being sequentially connected, and aeration pump is connected with the outfan of converter；Aeration head in 4 set aerating systems is respectively arranged in aerating biological filter pool filler, aerobic-anoxic selects pond inner bottom part, one-level Aeration tank inner bottom part and two-stage aeration tank inner bottom part；The communication ends of the converter in 4 set aerating systems is all connected with industrial PC communication ends；

Water outlet phosphate radical measures control system and includes sampling tube and online phosphate radical monitor, one end of sampling tube is arranged in clear water reserviors, the other end of sampling tube is connected with the water inlet end of online phosphate radical monitor, and the communication ends of online phosphate radical monitor is connected with industrial PC communication ends.

Further, preferably, the electrical connection between described industrial PC and on-line oxidation reduction potential meter, between industrial PC and converter, between industrial PC and online dissolved oxygen instrument, between industrial PC and online pH analyzer and between industrial PC and electromagnetic flowmeter all uses 485 to be connected by communication.

It is further preferred that BAF top is cylinder type, bottom is the turbination that cone angle is 60 ° of same diameter, and circular cone is horizontally disposed with stainless steel sift orifice plate with the joint of cylinder, and mesh size is 5mm, loading filler on sieve tray and form packing layer, packing material size is 0.6-1.5cm；Water distributor it is provided with directly over packing layer；Wherein, described filler is volcanic rock, haydite, quartz sand or zeolite.

It is further preferred that aeration head in described aerating biological filter pool filler (this aeration head is used for normal aeration) is arranged on above sieve tray, and with distance is packing layer thickness the 1/3 of sieve tray.Filler above the aeration head of normal aeration is in aerobic aeration state, nitration reaction mainly occurs, for aerobic nitrification zone, and be in the packing layer below normal aeration head and there is no aeration, the ammonia nitrogen remained in the nitrification water that can only pass through and nitrite anions, consume the dissolved oxygen in water, for deoxidation district.

It is further preferred that the top of described BAF is provided with drain valve, and drain valve is positioned at the top of packing layer；

The aeration pump being connected with aeration head in aerating biological filter pool filler, is connected with backwash aeration head also by the pipeline with normally closed gas solenoid valve；Described backwash aeration head (this aeration head is aeration when backwash) arranges the bottom of filler, and above sieve tray；Described aerating biological filter pool filler is additionally provided with normally opened gas solenoid valve on pipeline between aeration head and coupled aeration pump.

It is further preferred that be equipped with mud scraper in first stage precipitation tank and second-level settling pond.Mud scraper is driven by reducing motor and slowly runs, and rotating speed is advisable not stirring mud.Mud scraper includes reducing motor, central shaft, cleaning shoe and the bracing frame of support cleaning shoe, and cleaning shoe is to make the scraper plate around sedimentation tank central rotation along the edge, tapered zone of sedimentation tank.The Main Function of mud scraper is the central authorities that the mud at sedimentation tank bottom pyramidal edge scrapes sedimentation tank, and the mud of settling zone is carried out suitable disturbance, fills up the cavity above mud evacuation, accelerates the sludge pump suction to mud.Mud scraper can significantly improve the mobility of mud, reduces the mud time of staying at sedimentation tank to greatest extent.

A kind of continuous flow double sludge denitrification advanced nitrogen dephosphorization process, uses above-mentioned ANSAOAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, it is characterised in that comprise the steps:

Sewage is adjusted the water inlet end in pond and enters regulating reservoir, then is conveyed into anaerobic pond by intake pump and mixes with the mud being returned pump return by mud, under anaerobic discharges phosphorus, and the oxidation-reduction electrode that anaerobic pond end is arranged is in order to monitor the release of anaerobic pond phosphorus；

After anaerobic reaction terminates, mud mixed liquid flows into first stage precipitation tank, first stage precipitation tank precipitate and separate supernatant out flows into BAF, sequentially passing through aerobic aeration district and deoxidation district in BAF and carry out nitration reaction, the nitrification liquid obtained discharge outlet bottom BAF enters aerobic-anoxic by pipeline and selects pond；Industrial PC is by controlling the dissolved oxygen concentration of the nitrification liquid that the aeration intensity of aeration head in BAF controls to flow out from BAF between 0.5-1.0mg/L, and realizes whole nitrifications of ammonia nitrogen；

The mud of first stage precipitation tank sedimentation surmounts transport pump to aerobic-anoxic through the first mud and selects in pond, and the nitrification liquid flowed into BAF mixes, and obtains mud mixed liquid；Industrial PC is according to the oxidation reduction potential control needs of one-level anoxic pond, the supply frequency of aeration pump selecting pond by controlling aerobic-anoxic controls the size of aeration intensity when aerobic-anoxic selects the startup of aeration pump in pond and stopping and running, and makes the oxidation reduction potential control of one-level anoxic pond in the range of setting；

Mud mixed liquid is after aerobic-anoxic selects pond to flow out, flow into one-level anoxic pond, react in the reaction of one-level anoxic pond generation denitrifying phosphorus uptake and denitrification denitrogenation, industrial PC controls the oxidation-reduction potential of one-level anoxic pond by the oxidation-reduction potential controlling mud flow velocity and adjustment two-stage aeration tank that aerobic-anoxic selects the aeration intensity of aeration head in pond, the first mud to surmount pump, and making denitrification denitrogenation inhale phosphorus reaction can be carried out by the control condition set；

The mud mixed liquid flowed out from one-level anoxic pond flows into one-level Aeration tank, the ammonia nitrogen in mud mixed liquid carries out oxidative nitration reaction completely, aerobic phosphorus absorption reaction and organic degradation reaction occur simultaneously；The aerating system of one-level Aeration tank is by periodically increasing and reducing aeration intensity, increase and reduce the supply frequency of aeration pump, it is equivalent to increase or reduce aeration intensity, measures system detection pH Changing Pattern by pH simultaneously and determine the terminal of nitration reaction and keep corresponding aeration intensity；When increasing aeration intensity: if pH rises, then aeration intensity has been over the terminal of nitration reaction, it should reduce aeration intensity；If pH declines, then nitration reaction is incomplete, need to strengthen aeration intensity；If pH rises after falling before, at this moment aeration intensity just at nitrification terminal near, use adjust after aeration intensity.When reducing aeration intensity: if pH declines, then aeration intensity has been over the terminal of nitration reaction, need to reduce aeration intensity further；If pH rises, then nitration reaction is incomplete, need to strengthen aeration intensity；If pH present fall before after rise rule, at this moment aeration intensity just at nitrification terminal near, aeration intensity is adjusted back original aeration intensity constant.

After aerobic nitrification reaction terminates, mud mixed liquid flows into two grades of anoxic pond from one-level Aeration tank, surmounts pump with the second mud and mixes from the mud that surmounts that first stage precipitation tank conveying is next, and carries out second time denitrifying phosphorus uptake reaction and denitrification reaction；Industrial PC surmounts the flow velocity of pump and controls the oxidation-reduction potential of two grades of anoxic pond by controlling the second mud；First mud surmounts pump and the second mud to surmount the control principle of pump be to surmount mud preferentially to meet under conditions of the control of one-level anoxic pond requires, just consider to surmount flow rate pump and make the oxidation-reduction potential of two grades of anoxic pond reach to control requirement by adjusting the second mud.

Industrial PC reads by electromagnetic flowmeter that the first mud surmounts pump, the second mud surmounts the flow velocity of pump, under conditions of not changing the overall flow rate surmounting mud, the operating frequency adjusting the converter that mud surmounts pump changes two flow velocitys surmounting sludge pump, thus changes the mud to one-level Aeration tank and two grades of anoxic pond and supply.

Afterwards, mud mixed liquid flows into two-stage aeration tank, by aeration reinforcing aerobic phosphorus absorption effect before water outlet, next to that to the oxidative decomposition of residual organic substances and the nitration reaction of residue ammonia nitrogen.Industrial PC, by controlling the aeration pump supply frequency of two-stage aeration tank, i.e. controls aeration intensity and makes the oxidation reduction potential control of two-stage aeration tank in the range of setting；Industrial PC also can require can be adjusted meeting the control requirement of one-level anoxic pond oxidation-reduction potential to two-stage aeration tank oxidation-reduction potential according to the hydrogen reduction control of Electric potentials of one-level anoxic pond.

Last mud mixed liquid flows into second-level settling pond and carries out solid-liquid separation, and the supernatant after sedimentation is discharged in clear water reserviors settle further；The purification water of clear water reserviors clarification is discharged to outside device by drain pipe；Partial sludge in second-level settling pond sedimentation returns to anaerobic pond by mud return pump and starts new circulation, and another part mud is discharged to outside this device as excess sludge sludge pump；

Industrial PC adjusts one-level anoxic pond and the oxidation-reduction potential of two grades of anoxic pond by the concentration measuring clear water reserviors orthophosphoric acid root；By the control technology that this oxidation reduction potential control system is combined with water outlet orthophosphoric acid root control system, reach the control requirement to water outlet orthophosphoric acid root；

Wherein, mud mixed liquid is in each pond time of staying: anaerobic pond 1-2.5h, and aerobic-anoxic selects pond 0.2-1h, one-level anoxic pond 1-3h, one-level Aeration tank 0.5-1.5h, two grades of anoxic pond 0.5-2h, two-stage aeration tank 0.25-0.5h；

First stage precipitation tank supernatant is 2-8h in the BAF time of staying；

The gas-water ratio of BAF is: 10-40；

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

With intake pump flow velocity as reference, this device each flow rate pump proportion: intake pump 100%, the first mud surmounts flow rate pump 40% ~ 70%, and the second mud surmounts flow rate pump 0% ~ 15%, and mud returns flow rate pump 100% ~ 150%；

Anaerobic pond oxidation reduction potential control scope <-300mv, one-level anoxic pond oxidation reduction potential control scope-170 ~-100mv, two grades of anoxic pond oxidation reduction potential control scope-170 ~-100mv.Two-stage aeration tank oxidation reduction potential control scope :+0 ~+120mv.

Water outlet orthophosphoric acid root span of control 0.1 ~ 0.3mg/L.

It is further preferred that the sludge retention time in this device is 10-17 days.

The a large amount of mud of BAF longtime running and biomembrane accumulate at BAF, and biofilter can be made to occur the accumulation of blocking and a large amount of microorganisms that the release of phosphorus can be occurred to affect phosphor-removing effect.Therefore, tackle BAF when device runs 15 days to 20 days continuously and carry out backwash, during backwash, the normally opened gas solenoid valve of nitrification liquid being arranged between BAF and one-level Aeration tank in pipeline is closed, backwash electromagnetic valve and normally closed gas solenoid valve are opened, open backwashing pump simultaneously, clear water in clear water reserviors is injected below BAF BAF, the aeration pump operating frequency of BAF is transferred to maximum simultaneously, use backwash aeration head that whole packing area is carried out aeration, biofilm detachment on filler is promoted by the cutting disturbance of bubble.The flushing water drain valve from the top of BAF is discharged.After backwash terminates, close normally closed gas solenoid valve, backwash electromagnetic valve and backwashing pump, opening normally opened gas solenoid valve, carrying out normal water process work.

nullThe whole device of this utility model automatically controls based on industrial PC，In the case of sewage quality is relatively stable，Management personnel are according to the water quality of sewage、Carbon-nitrogen ratio and the situation of carbon-phosphorus ratio、The sedimentation situation of first stage precipitation tank mud，And clean-up effect to be reached，Determine feed water flow speed ratio、Mud surmounts the velocity ratio that pump is total、Mud returns the velocity ratio of pump，Run by artificial regulatory further，Detect each reaction tank orthophosphoric acid root、Ammonia nitrogen、Nitrate anion and the situation of change of nitrite anions，Determine the dissolved oxygen span of control of BAF，Determine the span of control of the oxidation-reduction potential of one-level anoxic pond and two grades of anoxic pond and two-stage aeration tank，Primarily determine that and adjust one-level anoxic pond and two grades of anoxic pond and the oxidation-reduction potential of two-stage aeration tank，Just two mud of successive step surmount the flow velocity of pump，Primarily determine that two-stage aeration tank makes the ammonia nitrogen in mud mixed liquid that the aeration intensity needed for thorough nitrification to occur，The i.e. supply frequency of aeration pump；

Industrial PC is automatically adjusted aerobic-anoxic according to practical situation and selects pond, the aeration intensity (i.e. supply frequency) of the aeration pump of two-stage aeration tank and two mud of adjustment surmount the flow velocity of pump, the oxidation-reduction potential making one-level anoxic pond and two grades of anoxic pond is in the span of control of setting, and make water outlet orthophosphoric acid root reach to control requirement by the oxidation-reduction potential adjusting one-level anoxic pond and two grades of anoxic pond, by adjusting the oxidation-reduction potential of two-stage aeration tank, with the aeration intensity (i.e. the supply frequency of aeration pump) controlling aerobic-anoxic selection pond, control aerobic-anoxic and select the aerobic and anaerobic condition in pond, the oxidation-reduction potential making one-level anoxic pond is in the controlled state of setting and carrys out intensified anti-nitrated suction phosphorus, aerobic phosphorus absorption and denitrification denitrogenation, make device can adapt to the most rapidly the change of sewage quality and concentration.When sewage quality changes greatly, then management personnel are needed in time the scope of control condition significantly to be adjusted according to carrying out practically situation.Industrial PC controls one-level anoxic pond, two grades of anoxic pond and the control method such as table 1 of two-stage aeration tank oxidation-reduction potential and water outlet orthophosphoric acid root.

Table 1 one-level anoxic pond, two grades of anoxic pond, two-stage aeration tank oxidation-reduction potential and the control method table of water outlet orthophosphoric acid root

The oxidation-reduction potential of one-level anoxic pond, the anoxic pond of two grades and two-stage aeration tank can adjust the most up and down, and span of control is the maximum span of control of oxidation-reduction potential, is adjusted in this span of control.Manager needs to be set the oxidation reduction potential control scope of one-level anoxic pond, two grades of anoxic pond and two-stage aeration tank in advance, to meet the control requirement of sewage quality and concentration change.

Two-stage aeration tank oxidation reduction potential control scope is optimized by the oxidation reduction potential control system of this device, is divided into upper limit span of control, middle span of control and lower limit span of control.

Lower limit controls: when the oxidation-reduction potential of two-stage aeration tank is in the lower limit of oxidation reduction potential control scope of two-stage aeration tank, sewage carbon-nitrogen ratio is relatively low, aerobic-anoxic selects the supply frequency of the aeration pump in pond less than or equal to the supply frequency needed for starting, aerobic-anoxic selects pond to be in anaerobic condition, whole device is in the state that organic carbon source extremely lacks, device can only be by reducing the consumption of the organic carbon source that mud mixed liquid aeration reduces, increase the supply of one-level anoxic pond organic carbon source, at this moment the control requirement of the oxidation-reduction potential of device inaccessiable one-level anoxic pond or two grades of anoxic pond, at this moment assembly first meets the control requirement of one-level anoxic pond, the most just consider the control requirement of two grades of anoxic pond.

Middle span of control: when the oxidation-reduction potential of two-stage aeration tank is between the upper and lower bound of two-stage aeration tank oxidation reduction potential control scope, sewage carbon-nitrogen ratio is lower slightly, aerobic-anoxic selects the supply frequency of the aeration pump in pond less than the supply frequency needed for starting, aerobic-anoxic selects pond to be in anaerobic condition, whole device is in the dynamically adjustment of two-stage aeration tank oxidation-reduction potential, by the adjustment to two-stage aeration tank oxidation-reduction potential, now the organic carbon source in sewage can only be just met for the oxidation reduction potential control requirement of one-level anoxic pond and two grades of anoxic pond.Constantly adapting in change owing to two-stage aeration tank oxidation-reduction potential is in, the control of device is in dynamic stability.At this moment the Nitrogen/Phosphorus Removal of sewage can be reached or slightly below design requirement by device substantially.

The upper limit controls: when the oxidation-reduction potential of two grades of anoxic pond is in the upper limit, sewage carbon-nitrogen ratio is higher, and aerobic-anoxic selects the supply frequency of the aeration pump in pond more than the supply frequency needed for starting, and aerobic-anoxic selects pond to be in aerobic aeration state.Only need to select pond and the aeration intensity of two-stage aeration tank by controlling aerobic-anoxic, and slightly adjust the flow velocity of No. two sludge pumps, so that it may so that device is in balanced steady state.At this moment device is optimal to the Nitrogen/Phosphorus Removal of sewage.

When two grades of anoxic pond oxidation-reduction potentials are less than span of control, lower the second sludge pump and surmount the flow velocity of pump.

When the oxidation-reduction potential of two-stage aeration tank is not in span of control, controlled by the aeration pump supply frequency adjusting two-stage aeration tank.

When one-level anoxic pond, two grades of anoxic pond, oxidation-reduction potentials of two-stage aeration tank are in span of control, the concentration according to water outlet orthophosphoric acid root is adjusted one-level anoxic pond and the oxidation-reduction potential of two grades of anoxic pond by industrial PC；

This device passes through periodic detection clear water reserviors orthophosphoric acid root concentration, adjusts one-level anoxic pond and two grades of anoxic pond oxidation-reduction potentials according to the concentration of clear water reserviors orthophosphoric acid root.When the concentration of water outlet orthophosphoric acid root is higher than span of control by raising one-level anoxic pond and the oxidation-reduction potential of two grades of anoxic pond, reduce the effect of denitrification denitrogenation, in mud mixed liquid, remain a small amount of nitrate ion, carry out the denitrifying phosphorus uptake effect of reinforcement sludge, improve the clean-up effect of phosphorus.When the concentration of water outlet orthophosphoric acid root is less than span of control, by lowering one-level anoxic pond and the oxidation-reduction potential of two grades of anoxic pond, reduce the nitrate ion of residual in mud mixed liquid, carry out the denitrification denitrogenation effect of reinforcement sludge, improve the clean-up effect of nitrogen.

Under normal operating conditions, the terminal oxidized reduction potential of anaerobic pond should be less than-300mv to this device, to guarantee the release of phosphorus, when the oxidation-reduction potential of anaerobic pond will be reported to the police higher than-300mv system.System significantly adjusts each control parameter by artificial regulatory.

It is 6 ~ 14 that this device processes sewage carbon-nitrogen ratio, the carbon-phosphorus ratio sanitary sewage more than 50, can reach comparatively ideal clean-up effect.

When the carbon-nitrogen ratio processing sewage is 4-6, deep purifying effect to be realized, advanced nitrogen dephosphorization can be realized at the additional organic carbon source of firsts and seconds anoxic pond, the upper limit control condition of the sewage that its control method is higher with carbon-nitrogen ratio is consistent, is just not described in detail.

Gas flowmeter is only intended to the situation of manager's manual record aeration, can directly control parameter not as this device.

Compared with prior art, it has the beneficial effect that this utility model

Make Denitrifying Phosphate Accumulating Organisms become anaerobic pond-aerobic-anoxic by technique adjustment startup stage of this device to select the dominant bacteria of activated sludge in pond, one-level anoxic pond-one-level Aeration tank-two grades anoxic pond-two-stage aeration tank, make nitrobacteria become the biomembranous dominant bacteria adhered on filler in BAF.

This utility model by the segmentation of anaerobic sludge surmount for one-level anoxic pond and two grades of anoxic pond realize step by step denitrification denitrogenation and step by step denitrifying phosphorus uptake process provide safeguard, the particularly anti-nitration reaction of two grades of anoxic pond only needs a small amount of anaerobic sludge, decrease ammonia nitrogen and enter into two grades of anoxic pond, decrease water outlet total nitrogen concentration；One-level Aeration tank pH controls nitrification terminal, organic carbon source is avoided to be fallen by excessive oxidation consumption, improving two grades of denitrifying abilities of anoxic pond below, one-level, two-stage aeration tank achieve aerobic phosphorus absorption and aerobic Nitrification step by step, it is to avoid excessive anaerobic environment causes the secondary of phosphorus to discharge；

This utility model device utilizes On-line Control technology sewage in optimum controling range to experience twice denitrification denitrogenation, the dilution of twice pair of ammonia nitrogen, ammonia nitrogen is carried out the processes such as oxidative nitration reaction, advanced nitrogen is finally done step-by-step for three times；By anaerobic phosphorus release, twice denitrification dephosphorization, twice aerobic phosphorus absorption, deep phosphorous removal is finally done step-by-step；Solve the denitrification nitrogen and phosphorus removal techniques such as A2N and Dephanox and cannot realize advanced nitrogen dephosphorization, the problem that effluent quality is unstable；

This utility model device, based on double sludge denitrification denitrogenation dephosphorizing principle, establishes anaerobism Anaerobic and selects the denitrifying activated sludge system of the Selective anoxia Anoxic aerobic Oxic aerobic Oxic of anoxia Anoxic and have double sludge systems that the biofilm system (i.e. BAF) of aerobic nitrification function Nitrifying combines.

This utility model is arranged in BAF bottom without aeration deoxidation district, and dissolved oxygen electrode is set at aeration nitrification tank water outlet, the dissolved oxygen content of on-line monitoring nitrification liquid water outlet controls aeration intensity, and that reduces dissolved oxygen while ensureing the complete nitrification of ammonia nitrogen enters into firsts and seconds anoxic pond；Reach the nitrification liquid water outlet of the low ammonia nitrogen of BAF and low DO concentration；

First stage precipitation tank and second-level settling pond arrange mud scraper, reduce the mud time of staying at sedimentation tank, it is to avoid sludge accumulation produces local anaerobic, the secondary release of the phosphorus caused；

This utility model device by measuring each reaction tank solubility orthophosphate, ammonia nitrogen, the concentration change situation of nitrate anion, can determine the optimal most stable of span of control of each reaction tank oxidation-reduction potential according to different sewage qualities and carbon-nitrogen ratio situation；Being 150mg/L to 1000mg/L when processing CODcr, carbon-nitrogen ratio is 6-14, carbon-phosphorus ratio > sanitary sewage of 50 time, this device water outlet total nitrogen, total phosphorus and CODcr many index can reach the surface water four above standard of class substantially.

When concentration of wastewater is relatively low, can correspondingly increase intake pump velocity ratio, correspondingly reduce mud mixed liquid reflux pump velocity ratio and improve the operational efficiency of this device.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of this utility model ANSAOAO based on On-line Control continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus；

Wherein, 1, regulating reservoir；2, submersible agitator；3, intake pump；4, anaerobic pond；5, exhaustor；6, oxidation-reduction electrode；7, on-line oxidation reduction potential meter；8, first stage precipitation tank；9, central shaft；10, reducing motor；11, cleaning shoe；12, converter；13, aeration pump；14, gas flowmeter；15, BAF；16, filler；17, aeration head；18, backwash aeration head；19, water-locator；20, mud valve；21, normally opened gas solenoid valve；22, normally closed gas solenoid valve；23, online dissolved oxygen instrument；24, drain valve；25, nitrification liquid normally open solenoid valve；26, dissolved oxygen electrode；27, electromagnetic flowmeter；28, the first mud surmounts pump；29, sieve tray；30, aerobic-anoxic selects pond；31, one-level anoxic pond；32, one-level Aeration tank；33, pH electrode；34, online pH analyzer；35, two grades of anoxic pond；36, two-stage aeration tank；37, the second mud surmounts pump；38, second-level settling pond；39, clear water reserviors；40, backwash electromagnetic valve；41, drain pipe；42, backwashing pump；43, mud returns pump；44, sludge pump；45, industrial PC；46, water inlet pipe；47, sampling tube；48, online phosphate radical monitor；

Wherein the direction of arrow is water (flow) direction.

Detailed description of the invention

Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model, and can not be construed to restriction of the present utility model.

Those skilled in the art of the present technique are understandable that, the correlation module related in this utility model and the function of realization thereof are that in the hardware after improvement and the device of composition, device or system, in lift-launch prior art, conventional computer software programs or relevant agreement achieve that, are not to improve computer software programs of the prior art or relevant agreement.Such as, the computer hardware system after improvement still can realize the specific function of this hardware system by loading existing operation system of software.It is understood, therefore, that innovation of the present utility model be in prior art hardware module improvement and connect syntagmatic, rather than be only in hardware module for realizing the improvement of software or the agreement carried about function.

Those skilled in the art of the present technique are it is understood that the one or more hardware device that is performed in the step in operation described herein, method, flow process, measure, scheme of the correlation module mentioned in this utility model.Described hardware device can be required purpose and specialized designs and manufacture, or can also use the known device in general purpose computer or other hardware devices known.Described general purpose computer activates or reconstructs with having storage procedure Selection within it.

Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " may also comprise plural form.Should be further understood that, the wording used in description of the present utility model " includes " referring to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim element to be " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also there is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connections or couple.Wording "and/or" used herein includes one or more any cell listing item being associated and all combinations.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technical term and scientific terminology) have with the those of ordinary skill in this utility model art be commonly understood by identical meaning.Should also be understood that those terms defined in such as general dictionary should be understood that have the meaning consistent with the meaning in the context of prior art, and unless defined as here, will not explain by idealization or the most formal implication.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, and annexation used herein, without special explanation, can realize function of the present utility model, and with the those of ordinary skill in this utility model art be commonly understood by identical.

Below in conjunction with embodiment, this utility model is described in further detail.

It will be understood to those of skill in the art that the following example is merely to illustrate this utility model, and should not be regarded as limiting scope of the present utility model.Unreceipted concrete technology or condition person in embodiment, according to the technology described by the document in this area or condition or carried out according to product description.Material therefor or instrument unreceipted production firm person, be the conventional products that can be obtained by purchase.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, selects pond 30, one-level anoxic pond 31,32, two grades of anoxic pond 35 of one-level Aeration tank, two-stage aeration tank 36, second-level settling pond 38, clear water reserviors 39, oxidation reduction potential determination control system, DO determination control system, nitrification terminal point control system, aerating system, water outlet orthophosphoric acid root to measure control system and industrial PC 45 including regulating reservoir 1, anaerobic pond 4, first stage precipitation tank 8, BAF 15, aerobic-anoxic；

The water inlet end of regulating reservoir 1 connects water inlet pipe 46, and the water side of regulating reservoir 1 is by being connected with the water inlet end of anaerobic pond 4 with the pipeline of intake pump 3；The water side of anaerobic pond 4 is connected by pipeline with the water inlet end of first stage precipitation tank 8；

First stage precipitation tank 8 supernatant water side is connected with the water-locator above BAF 15 by pipeline；

Discharge outlet bottom BAF 15 is by selecting the water inlet end in pond 30 to be connected with the pipeline of nitrification liquid normally open solenoid valve 25 with aerobic-anoxic；

Aerobic-anoxic selects pond 30, one-level anoxic pond 31,32, two grades of anoxic pond 35 of one-level Aeration tank, two-stage aeration tank 36 and second-level settling pond 38 to be connected by pipeline successively order；I.e. aerobic-anoxic selects the water side in pond 30 to be connected with the water inlet end of one-level anoxic pond 31；The water side of one-level anoxic pond 31 is connected with the water inlet end of one-level Aeration tank 32, the like；

The supernatant water side of described second-level settling pond 38 is connected by the water inlet end of pipeline with clear water reserviors 39；

The water side of clear water reserviors 39 connects drain pipe 41；The lower section discharge outlet of clear water reserviors 39, backwash electromagnetic valve 40, backwashing pump 42 are connected by pipeline successively order with BAF 15 bottom discharge mouth；The pipeline with mud valve 20 it is also associated with bottom BAF 15；

The bottom mud discharging mouth of second-level settling pond 38 is connected with the water inlet end of anaerobic pond 4 by returning the pipeline of pump 43 with mud；The bottom mud discharging mouth of second-level settling pond 38 is also connected with the pipeline with sludge pump 44；

The bottom mud discharging mouth of first stage precipitation tank 8 selects the water inlet end in pond 30 to be connected by surmounting the pipeline of pump 28 with the first mud with aerobic-anoxic；The bottom mud discharging mouth of first stage precipitation tank 8 is connected also by the water inlet end of the pipeline and two grades of anoxic pond 35 surmounting pump 37 with the second mud；

First mud surmounts the pipeline that pump 28 and aerobic-anoxic select the water inlet end in pond 30 to be connected and is provided with mud electromagnetic flowmeter 27, second mud surmounts and also is provided with mud electromagnetic flowmeter 27 on the pipeline that pump 37 is connected with the water inlet end of two grades of anoxic pond 35, and the communication ends of two mud electromagnetic flowmeters 27 all communication ends with industrial PC 45 are connected；Industrial PC 45 surmounts pump the 28, second mud by converter 12 the most respectively and surmounts pump 37 and be connected with the first mud；

It is equipped with submersible agitator 2 in described regulating reservoir 1, anaerobic pond 4, aerobic-anoxic selection pond 30, one-level anoxic pond 31,32, two grades of anoxic pond 35 of one-level Aeration tank and two-stage aeration tank 36；The middle and lower part that preferably submersible agitator 2 is located in pond；

Described regulating reservoir 1, anaerobic pond 4, aerobic-anoxic selection pond 30, one-level anoxic pond 31 and two grades of anoxic pond 35 all seal and (seal and be not the most passed through air, but allow water to flow through), and the top of anaerobic pond 4, aerobic-anoxic selects the top in pond 30, the top of the top of one-level anoxic pond 31 and two grades of anoxic pond 35 is equipped with exhaustor 5；Exhaustor 5 is used for discharging in respective cells produced gas.

Described oxidation reduction potential determination control system has four sets, and often set oxidation reduction potential determination control system includes oxidation-reduction electrode 6 and the on-line oxidation reduction potential meter 7 being connected；The oxidation-reduction electrode 6 of 4 set oxidation reduction potential determination control systems is respectively arranged on the water side of anaerobic pond 4, the water side of one-level anoxic pond 31, the water side of two grades of anoxic pond 35 and the water side of two-stage aeration tank 36；4 overlap the corresponding oxidation-reduction electrode in on-line oxidation reduction potential meter 7 one end in oxidation reduction potential determination control systems 6 is connected, and the other end is connected with industrial PC 45 communication ends；

Described DO determination control system includes dissolved oxygen electrode 26 and the online dissolved oxygen instrument 23 being connected, described dissolved oxygen electrode 26 is located at the water side of BAF 15 and aerobic-anoxic selects between the water inlet end in pond 30 in pipeline, dissolved oxygen electrode 26 is connected with the outfan of online dissolved oxygen instrument 23, and the input of described online dissolved oxygen instrument 23 is connected with industrial PC 45 communication ends；

Described nitrification terminal point control system, including the pH electrode 33 being connected and online pH analyzer 34, pH electrode 33 is located at the water side of one-level Aeration tank 32；PH electrode 33 is connected with the measurement signal end of online pH analyzer 34, and the communication ends of described online pH analyzer 34 is connected with industrial PC 45 communication ends；

Described aerating system has 4 sets, and often set aerating system includes aeration head 17, gas flowmeter 14, aeration pump 13 and the converter 12 being sequentially connected, and aeration pump 13 is connected with the outfan of converter 12；Aeration head 17 in 4 set aerating systems is respectively arranged in BAF 15 filler 16, aerobic-anoxic selects pond 30 inner bottom part, one-level Aeration tank 32 inner bottom part and two-stage aeration tank 36 inner bottom part；The communication ends of the converter 12 in 4 set aerating systems is all connected with industrial PC 45 communication ends；

Water outlet phosphate radical measures control system and includes sampling tube 47 and online phosphate radical monitor 48, one end of sampling tube 47 is arranged in clear water reserviors 39, the other end of sampling tube 47 is connected with the water inlet end of online phosphate radical monitor 48, and the communication ends of online phosphate radical monitor 48 is connected with the communication ends of industrial PC 45.

As further preferred scheme of the present utility model, the electrical connection between described industrial PC 45 and on-line oxidation reduction potential meter 7, between industrial PC 45 and converter 12, between industrial PC 45 and online dissolved oxygen instrument 23, between industrial PC 45 and online pH analyzer 34 and between industrial PC 45 and electromagnetic flowmeter 27 all uses 485 to be connected by communication.

As further preferred scheme of the present utility model, BAF 15 top is cylinder type, bottom is the turbination that cone angle is 60 ° of same diameter, circular cone is horizontally disposed with stainless steel sift orifice plate 29 with the joint of cylinder, mesh size is 5mm, loading filler 16 on sieve tray 29 and form packing layer, filler 16 particle diameter is 0.6-1.5cm；Water distributor 19 it is provided with directly over packing layer；Wherein, described filler 16 is volcanic rock, haydite, quartz sand or zeolite.

As further preferred scheme of the present utility model, described this aeration head of aeration head 17(in BAF 15 filler 16 is used for normal aeration) be arranged on sieve tray above in the of 29, and with distance is packing layer thickness the 1/3 of sieve tray 29.Filler above the aeration head of normal aeration is in aerobic aeration state, nitration reaction mainly occurs, for aerobic nitrification zone, and be in the packing layer below normal aeration head and there is no aeration, the ammonia nitrogen remained in the nitrification water that can only pass through and nitrite anions, consume the dissolved oxygen in water, for deoxidation district.

As further preferred scheme of the present utility model, the top of described BAF 15 is provided with drain valve 24, and drain valve 24 is positioned at the top of packing layer；

The aeration pump 13 being connected with aeration head 17 in BAF 15 filler 16 is connected with backwash aeration head 18 also by the pipeline with normally closed gas solenoid valve 22；Described backwash aeration head 18 arranges the bottom of filler 16, and above sieve tray 29；Described BAF 15 filler 16 is additionally provided with normally opened gas solenoid valve 21 on pipeline between aeration head 17 and coupled aeration pump 13.

It is equipped with mud scraper in first stage precipitation tank 8 and second-level settling pond 38.Mud scraper is driven by reducing motor 10 and slowly runs, and rotating speed is advisable not stirring mud.Mud scraper includes reducing motor 10, central shaft 9, cleaning shoe 11 and supports the bracing frame of cleaning shoe, and cleaning shoe 11 is to make the scraper plate around sedimentation tank central rotation along the edge, tapered zone of sedimentation tank.The Main Function of mud scraper is the central authorities that the mud at sedimentation tank bottom pyramidal edge scrapes sedimentation tank, and the mud of settling zone is carried out suitable disturbance, fills up the cavity above mud evacuation, accelerates the sludge pump suction to mud.Mud scraper can significantly improve the mobility of mud, reduces the mud time of staying at sedimentation tank to greatest extent.

A kind of continuous flow double sludge denitrification advanced nitrogen dephosphorization process, uses above-mentioned ANSAOAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, comprises the steps:

Sewage is adjusted the water inlet end in pond 1 and enters regulating reservoir 1, it is conveyed into anaerobic pond 4 by intake pump 3 again and mixes with the mud returned by mud return pump 43, under anaerobic discharging phosphorus, the oxidation-reduction electrode 6 that anaerobic pond 4 end is arranged is in order to monitor the release of anaerobic pond 4 phosphorus；

After anaerobic reaction terminates, mud mixed liquid flows into first stage precipitation tank 8, and first stage precipitation tank 8 precipitate and separate supernatant out flows into BAF 15, carries out nitration reaction, obtaining nitrification liquid, the discharge outlet bottom BAF 15 enters aerobic-anoxic and selects pond 30；Industrial PC 45 is by controlling the dissolved oxygen concentration of the nitrification liquid that the aeration intensity of aeration head 17 in BAF 15 controls to flow out from BAF 15 between 0.5-1.0mg/L, and realizes whole nitrifications of ammonia nitrogen；

The mud of first stage precipitation tank 8 sedimentation surmounts pump 28 through the first mud and is delivered in aerobic-anoxic selection pond 30, and the nitrification liquid flowed into BAF 15 mixes, and obtains mud mixed liquid；

The size of the aeration intensity when operation of the aeration pump 13 in aerobic-anoxic selection pond 30 and stopping and operation needs to determine according to the oxidation reduction potential control of one-level anoxic pond 31；

Mud mixed liquid is after aerobic-anoxic selects pond 30 to flow out, flow into one-level anoxic pond 31, denitrifying phosphorus uptake reaction and denitrification denitrogenation is occurred to react in one-level anoxic pond 31, industrial PC 45 controls the oxidation-reduction potential of one-level anoxic pond 31 by the oxidation-reduction potential controlling mud discharge and adjustment two-stage aeration tank 36 that aerobic-anoxic selects the aeration intensity of aeration head 17 in pond 30, the first mud to surmount pump 28, and making denitrification denitrogenation inhale phosphorus reaction can be normally carried out；

The mud mixed liquid flowed out from one-level anoxic pond 31 flows into one-level Aeration tank 32, the ammonia nitrogen in mud mixed liquid carries out oxidative nitration reaction completely, aerobic phosphorus absorption reaction and organic degradation reaction occur simultaneously；Industrial PC 45 strengthens and reduces aeration intensity by control, and the situation of change of detection pH judges that aeration intensity the most just equals or exceeds the aeration intensity needed for nitrification terminal；

After aerobic nitrification reaction terminates, mud mixed liquid flows into two grades of anoxic pond 35 from one-level Aeration tank 32, surmounts pump 37 with the second mud and mixes from the mud that surmounts that first stage precipitation tank 8 conveying is next, and carries out second time denitrifying phosphorus uptake reaction and denitrification reaction；Industrial PC 45 surmounts the velocity ratio of pump 37 and controls the oxidation-reduction potential of two grades of anoxic pond 35 by controlling the second mud；

Afterwards, mud mixed liquid flows into two-stage aeration tank 36 and carries out the oxidative decomposition of residual organic substances, aerobic phosphorus absorption reaction and the nitration reaction of residue ammonia nitrogen, and industrial PC 45 controls the oxidation-reduction potential of two-stage aeration tank 36 by controlling the aeration intensity of two-stage aeration tank 36；

Last mud mixed liquid flows into second-level settling pond 38 and carries out solid-liquid separation, and the supernatant after sedimentation is discharged in clear water reserviors 39 settle further；The purification water of clear water reserviors 39 clarification is discharged to outside device by drain pipe 41；Partial sludge in second-level settling pond 38 sedimentation returns to anaerobic pond 4 by mud return pump 43 and starts new circulation, and another part mud is discharged to outside this device as excess sludge sludge pump 44；Industrial PC 45 adjusts one-level anoxic pond 31 and the oxidation-reduction potential of two grades of anoxic pond 35 by the concentration measuring clear water reserviors 39 orthophosphoric acid root, thus controls the orthophosphate of water outlet and the concentration of total phosphorus；

Wherein, mud mixed liquid is in each pond time of staying: anaerobic pond 1-2.5h, and aerobic-anoxic selects pond 0.2-1h, one-level anoxic pond 1-3h, one-level Aeration tank 0.5-1.5h, two grades of anoxic pond 0.5-2h, two-stage aeration tank 0.25-0.5h；

First stage precipitation tank supernatant is 2-8h in the BAF time of staying；

The gas-water ratio of BAF is: 10-40；

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

With intake pump flow velocity as reference, this device each flow rate pump proportion: intake pump 100%, the first mud surmounts flow rate pump 30%-80%, and the second mud surmounts flow rate pump 0%-10%, and mud returns flow rate pump 100%-150%；

Oxidation reduction potential control system each reaction tank oxidation reduction potential control scope: anaerobic pond <-300mv, one-level anoxic pond-170 ~-100mv, two grades of anoxic pond-170 ~-100mv.Two-stage aeration tank :+0 ~+120mv.

Preferred version be the sludge retention time in this device be 10-17 days.

Application example 1

This utility model device seed sludge takes from Kunming sewage treatment plant, carries out taming 15 days with domestic sewage from campus, and the domestication stage promotes the nitrobacteria growth and breeding in biofilter by strengthening the aeration intensity of BAF.

Domestication terminates post debugging and runs, and is determined the optimum controling range of each control parameter by debugging.

BAF dissolved oxygen span of control 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, it is achieved that the complete nitrification of ammonia nitrogen, it is ensured that the clean-up effect of this device total nitrogen.

Wherein, with intake pump flow velocity as reference, each flow rate pump proportion: intake pump 100%, mud surmounts pump overall flow rate and surmounts flow rate pump 40%-50% than 50%(the first mud, second mud surmounts flow rate pump 0%-10%, mud surmounts pump overall flow rate and surmounts flow rate pump the+the second mud than the=the first mud and surmount flow rate pump), mud returns flow rate pump 100%；

Mud mixed liquid is in this device each reaction tank time of staying, and anaerobic pond 1.5h, aerobic-anoxic selects pond 0.5h, one-level anoxic pond 2h, one-level Aeration tank 1h, two grades of anoxic pond 1.5h, two-stage aeration tank 0.5h.First stage precipitation tank supernatant is 4h in the BAF time of staying.

Each reaction tank oxidation reduction potential control scope: anaerobic pond <-300mv, span of control-160 ~-110mv of one-level anoxic pond, two grades of anoxic pond span of control-160 ~-110mv, the span of control 0 ~+120mv of two-stage aeration tank.

First stage precipitation tank supernatant is 3 ~ 5h in the BAF time of staying.

The gas-water ratio of BAF is: 30 ~ 40；

The mud time of staying in this device controls at about 14 days, and the sludge concentration of anaerobic pond, one-level anoxic pond and two grades of anoxic pond controls in the range of 2500mg/L ~ 3500mg/L；

Through continuous bimestrial properly functioning, when domestic sewage from campus influent COD cr is 330-760mg/L, total nitrogen is 45-70mg/L, carbon-nitrogen ratio is in the range of 7-12, when total phosphorus is 6.2-9.0mg/L scope, nitric efficiency is the most all between 98-99.5%, and dephosphorization efficiency is substantially between 97.0-99.0%, between purification efficiency 93-95% of CODcr.The aqueous concentration of TN only has between 0.2-0.8mg/L, and the aqueous concentration of total phosphorus only has 0.1-0.3mg/L.Obviously the TN of water outlet reaches the surface water 2 above water quality of class, TP basically reaches the surface water 4 above water quality of class and CODcr reaches the surface water one above water quality of class, is successfully realized the target of the step deep purifying to domestic sewage from campus.

Using this utility model method to compare with other existing method, result is as shown in table 2.

Table 2

From table 2, this utility model method has good nitric efficiency and dephosphorization efficiency, and effect is superior to other existing forward position technique.

Above content is to combine the further description that this utility model is done by concrete preferred implementation, it is easy to this technology those skilled in the art be understood that and apply this utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model those of ordinary skill in the field, without departing from the concept of the premise utility, it is also possible to make some simple deductions and replacement, without through performing creative labour.Therefore, those skilled in the art is according to announcement of the present utility model, and the improvement making this utility model all should be within protection domain of the present utility model.

Claims (6)

1. continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, it is characterized in that, select pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond, two-stage aeration tank, second-level settling pond, clear water reserviors, oxidation reduction potential determination control system, DO determination control system, nitrification terminal point control system, aerating system, water outlet orthophosphoric acid roots to measure control system and industrial PC including regulating reservoir, anaerobic pond, first stage precipitation tank, BAF, aerobic-anoxic；

The water inlet end of regulating reservoir connects water inlet pipe, and the water side of regulating reservoir is by being connected with the water inlet end of anaerobic pond with the pipeline of intake pump；The water side of anaerobic pond is connected by pipeline with the water inlet end of first stage precipitation tank；

First stage precipitation tank supernatant water side is connected with the water-locator above BAF by pipeline；

Discharge outlet bottom BAF is by selecting the water inlet end in pond to be connected with the pipeline of nitrification liquid normally open solenoid valve with aerobic-anoxic；

Aerobic-anoxic selects pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond, two-stage aeration tank, second-level settling ponds to be connected by pipeline successively order；

The supernatant water side of described second-level settling pond is connected with the water inlet end of clear water reserviors by pipeline；

The water side of clear water reserviors connects drain pipe；The lower section discharge outlet of clear water reserviors, backwash electromagnetic valve, backwashing pump are connected by pipeline successively order with BAF bottom discharge mouth；The pipeline with mud valve it is also associated with bottom BAF；

The bottom mud discharging mouth of second-level settling pond is connected with the water inlet end of anaerobic pond by returning the pipeline of pump with mud；The bottom mud discharging mouth of second-level settling pond is also connected with the pipeline with sludge pump；

The bottom mud discharging mouth of first stage precipitation tank selects the water inlet end in pond to be connected by surmounting the pipeline of pump with the first mud with aerobic-anoxic；The bottom mud discharging mouth of first stage precipitation tank is connected also by the water inlet end of the pipeline and two grades of anoxic pond surmounting pump with the second mud；

First mud surmounts the pipeline that pump and aerobic-anoxic select the water inlet end in pond to be connected and is provided with mud electromagnetic flowmeter, second mud surmounts and also is provided with mud electromagnetic flowmeter on the pipeline that the water inlet end of pump and two grades of anoxic pond is connected, and the communication ends of two mud electromagnetic flowmeters is all connected with industrial PC communication ends；Industrial PC surmounts pump by converter and the first mud the most respectively, the second mud surmounts pump and is connected；

It is equipped with submersible agitator in described regulating reservoir, anaerobic pond, aerobic-anoxic selection pond, one-level anoxic pond, one-level Aeration tank, two grades of anoxic pond and two-stage aeration tank；

Described regulating reservoir, anaerobic pond, aerobic-anoxic selection pond, one-level anoxic pond and two grades of anoxic pond all seal, and the top of the top of anaerobic pond, the aerobic-anoxic selection top in pond, the top of one-level anoxic pond and two grades of anoxic pond is equipped with exhaustor；

Described oxidation reduction potential determination control system has four sets, and often set oxidation reduction potential determination control system includes oxidation-reduction electrode and the on-line oxidation reduction potential meter being connected；The oxidation-reduction electrode of 4 set oxidation reduction potential determination control systems is respectively arranged on the water side of anaerobic pond, the water side of one-level anoxic pond, the water side of two grades of anoxic pond and the water side of two-stage aeration tank；4 overlap the corresponding oxidation-reduction electrode in the on-line oxidation reduction potential meter one end in oxidation reduction potential determination control systems is connected, and the other end is connected with industrial PC communication ends；

Described DO determination control system includes the dissolved oxygen electrode that is connected and online dissolved oxygen instrument, described dissolved oxygen electrode is located at the water side of BAF and aerobic-anoxic selects between the water inlet end in pond in pipeline, dissolved oxygen electrode is connected with the outfan of online dissolved oxygen instrument, and the input of described online dissolved oxygen instrument is connected with industrial PC communication ends；

Described nitrification terminal point control system, including the pH electrode being connected and online pH analyzer, pH electrode is located at the water side of one-level Aeration tank；PH electrode is connected with the measurement signal end of online pH analyzer, and the communication ends of described online pH analyzer is connected with industrial PC communication ends；

Described aerating system has 4 sets, and often set aerating system includes aeration head, gas flowmeter, aeration pump and the converter being sequentially connected, and aeration pump is connected with the outfan of converter；Aeration head in 4 set aerating systems is respectively arranged in aerating biological filter pool filler, aerobic-anoxic selects pond inner bottom part, one-level Aeration tank inner bottom part and two-stage aeration tank inner bottom part；The communication ends of the converter in 4 set aerating systems is all connected with industrial PC communication ends；

Water outlet phosphate radical measures control system and includes sampling tube and online phosphate radical monitor, one end of sampling tube is arranged in clear water reserviors, the other end of sampling tube is connected with the water inlet end of online phosphate radical monitor, and the communication ends of online phosphate radical monitor is connected with industrial PC communication ends.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control the most according to claim 1, it is characterized in that, the electrical connection between described industrial PC and on-line oxidation reduction potential meter, between industrial PC and converter, between industrial PC and online dissolved oxygen instrument, between industrial PC and online pH analyzer and between industrial PC and electromagnetic flowmeter all uses 485 to be connected by communication.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control the most according to claim 1, it is characterized in that, BAF top is cylinder type, bottom is the turbination that cone angle is 60 ° of same diameter, circular cone is horizontally disposed with stainless steel sift orifice plate with the joint of cylinder, mesh size is 5mm, sieve tray loads filler and forms packing layer, and packing material size is 0.6-1.5cm；Water distributor it is provided with directly over packing layer；Wherein, described filler is volcanic rock, haydite, quartz sand or zeolite.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control the most according to claim 3, it is characterized in that, the described aeration head in aerating biological filter pool filler is arranged on above sieve tray, and with distance is packing layer thickness the 1/3 of sieve tray.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control the most according to claim 4, it is characterised in that the top of described BAF is provided with drain valve, and drain valve is positioned at the top of packing layer；

The aeration pump being connected with aeration head in aerating biological filter pool filler is connected with backwash aeration head also by the pipeline with normally closed gas solenoid valve；Described backwash aeration head arranges the bottom of filler, and above sieve tray；Described aerating biological filter pool filler is additionally provided with normally opened gas solenoid valve on pipeline between aeration head and coupled aeration pump.

Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control the most according to claim 1, it is characterised in that be equipped with mud scraper in first stage precipitation tank and second-level settling pond.