CN104710010A - Real-time AAO oxidation ditch regulation system and sewage treatment method thereof - Google Patents
Real-time AAO oxidation ditch regulation system and sewage treatment method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/308—Biological phosphorus removal
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- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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Abstract
The invention discloses a real-time AAO oxidation ditch regulation system and a sewage treatment method thereof. The method comprises the following steps: denitrifying mixed solution in an anoxic pond and refluxing the denitrified mixed solution into an anaerobic tank to perform anaerobic phosphate release with raw water, so that the influence of nitrate on the anaerobic phosphate release in the traditional AAO process is overcome; entering the mixed solution in the anoxic pond, the returned sludge in a secondary sedimentation tank and return nitrification liquor in the oxidation ditch into the anoxic pond together, and performing nitrogen removal by denitrification; entering the mixed solution in the anoxic pond into the oxidation ditch, and creating an aerobic-anoxic alternative environment by virtue of regulation, so that simultaneous nitrification and denitrification are performed in the ditch, and a denitrification effect is enhanced; and regulating the aeration mode, reflux ratio and the like in real time according to signals acquired by each online monitor by using a PLC control system. The traditional AAO oxidation ditch is subjected to structure and equipment transformation and operating mode regulation, a set of real-time regulation system based on water inflow change is established, the problems such as sludge deposition, poor nitrogen and phosphorus removal effect and high energy consumption existing in the AAO oxidation ditch are solved, and the aims of allowing the effluent to stably reach the standard, saving the energy and reducing the consumption are achieved.
Description
Technical field
The invention belongs to field of environment protection, be specifically related to a kind of AAO oxidation ditch real-time monitoring system and sewage water treatment method thereof.
Background technology
AAO (Anaerobic-Anoxic-Oxic) technique anaerobic-aerobic dephosphorization system and anaerobic-aerobic denitrification system is combined to form, be made up of anaerobic pond, anoxic pond and Aerobic Pond, also known as anaerobic-anoxic-oxic method, it is biological carbon and phosphorous removal fundamental technology.The hydraulic detention time of this technique is less than other similar technique, and anaerobic/anoxic/aerobic alternate run, efficiently avoid sludge bulking, and SVI value is generally less than 100; In this technique, return current ratio of the mixed liquid is often comparatively large, therefore has very high power consumption, and in addition, because large amount of organic is utilized in anaerobism section, cause anoxic section denitrifying carbon source not enough, anti-nitration reaction is not thorough, affects denitrification effect.
Oxidation ditch has another name called continuous circulation aeration tank (Continuous Loop Reactor), is the one distortion of activated sludge process.Oxidation ditch sewage treatment technology originates from Holland, is widely used in the process of sanitary sewage and trade effluent at present at home and abroad, is one of first-selected technique of newly-built sewage work.Oxidation ditch has special hydromechanics fluidised form, the feature of existing complete mix flow, has again the feature of plug flow reactor, can form the multistage AO environment that aerobic-anaerobic replaces in ditch, be conducive to the generation of simultaneous nitrification-denitrification (SND), strengthened denitrification effect.Oxidation ditch have stable, convenient management, effluent quality are good, economic dispatch advantage of disposing of sewage, but when intake water temperature lower and sludge loading is higher time, easily there is sludge bulking, cause water suspension too high.In addition, because in ditch, velocity flow profile is uneven, easily sludgd deposition problem is produced.
AAO oxidation ditch sets up anaerobic pond and anoxic pond on the basis of oxidation ditch, and the overall operational mode forming A-A-O, wherein Aerobic Pond is oxidation ditch type.AAO oxidation ditch has the advantage of AAO and oxidation ditch concurrently, has the advantages such as preventing sludge bulking, intensified denitrification and dephosphorization and saves energy and reduce the cost.The author once exposed to the sun oxidation ditch process for object with well head sewage work of Chongqing City AAO table, in running for it, Problems existing is optimized regulation and control and improves, nitric efficiency improves 23%, power consumption on average reduces by 25%, water outlet TN is stable is better than GB18918-2002 one-level B standard, but anaerobic pond and anoxic pond still exist dead band, produce in regulation and control and adopt chemical agent auxiliary dephosphorization, add partially disposed cost.
Summary of the invention
The present invention causes water outlet can not stably reaching standard and the problem such as energy consumption is high to solve during AAO oxidation ditch runs the sludgd deposition, the poor denitrification and dephosphorization effect that exist, a kind of AAO oxidation ditch real-time monitoring system and regulation and control treatment process thereof are proposed, by carrying out equipment, ditch type and the improvement of device and the regulation and control of operation scheme to AAO oxidation ditch, set up a set of AAO oxidation ditch real-time monitoring system based on water inlet change, realize the object that intensified denitrification and dephosphorization, stable water outlet are up to standard, energy-saving and cost-reducing.
For achieving the above object, adopt technical scheme as follows:
A kind of AAO oxidation ditch real-time monitoring system, is made up of anaerobic pond, anoxic pond, oxidation ditch, on-line computing model and PLC control system;
The bend of described anaerobic pond and anoxic pond adopts fillet pond type; Anaerobic pond is provided with water-in to anoxic pond; Oxidation ditch to anoxic pond is provided with nitrification liquid return flow line; Second pond returned sluge, oxidation ditch backflow nitrification liquid and from the mixed solution of anaerobic pond in anoxic pond generation denitrification, be that nitrogen is removed by nitrate transformation; Meanwhile, anoxic pond to anaerobic pond is provided with mixed-liquor return passage, and the mixed-liquor return in anoxic pond after denitrogenation, to anaerobic pond, together with water inlet, anaerobic phosphorus release effect occurs;
Described oxidation ditch adopts two ditch formula, and bend adopts fillet pond type; Oxidation ditch water-in is located at the first straight way place, and oxidation ditch is located at the 4th straight way place to anoxic pond nitrification liquid return flow line; By optimizing aeration turn plate quantity and operational mode, make the multistage AO environment that in oxidation ditch, formation aerobic-anaerobic replaces, constantly there is nitration and opposite nitration in mixed solution, enhance denitrification effect in oxidation ditch; Oxidation ditch nitrification liquid is back to anoxic pond with the nitrate needed for supplementary denitrification denitrogenation;
Be provided with redox potential (ORP) on-line computing model in described anaerobic pond, and be connected with PLC control system; Described ORP on-line computing model is arranged between anoxic pond water-in and anoxic pond to anaerobic pond return flow line; NO is provided with in described anoxic pond
3 --N on-line computing model, and be connected with PLC control system; Described NO
3 --N on-line computing model is arranged between anoxic pond water-in and anoxic pond to anaerobic pond return flow line; Described oxidation ditch water outlet is provided with MLSS, NH
4 +-N, DO on-line computing model I are all connected with PLC control system; Oxidation ditch to ingress, anoxic pond nitrification liquid return flow line is provided with DO on-line computing model II and is connected with PLC control system.
By such scheme, be provided with three aeration turn plates in described oxidation ditch, be positioned over second and third respectively, in four straight ways, aeration turn plate realizes the regulation and control of rotating speed by frequency transformer, each aeration turn plate upstream is provided with impeller and flow-stopping plate under water, and downstream is provided with flow deflector; Impeller and a table flotation cartridge type impeller is under water provided with in first straight way of described oxidation ditch.
By such scheme, anaerobic pond and anoxic pond bend place are provided with two pass training wall, and straight way place is provided with two-stage flow deflector; Described flow deflector is arranged at the downstream direction of impeller under water, forms angle α with the downstream water surface, and α is 45 °-55 °.
The sewage water treatment method of above-mentioned AAO oxidation ditch real-time monitoring system, comprises the following steps:
1) former water enters anaerobic pond, carries out anaerobic phosphorus release effect together with anoxic pond backflow mixed liquor, and ORP on-line computing model gathers ORP value in anaerobic pond;
2) anaerobic pond mixed solution enters anoxic pond, refluxes together with nitrification liquid carry out denitrification, NO with second pond returned sluge and oxidation ditch
3 --N on-line computing model gathers nitrate nitrogen concentration in anoxic pond;
3) anoxic pond mixed solution enters oxidation ditch, MLSS, NH in oxidation ditch
4 +-N on-line computing model gathers oxidation ditch water outlet sludge concentration and ammonia nitrogen concentration respectively, and DO on-line computing model I gathers the dissolved oxygen concentration of oxidation ditch water outlet, and DO on-line computing model II gathers the dissolved oxygen concentration of oxidation ditch to ingress, anoxic pond return flow line; Mixed solution carries out simultaneous nitrification-denitrification effect in oxidation ditch; Second pond returned sluge is back to anoxic pond;
4) each on-line computing model is by the Signal transmissions that collects to PLC control system, calculates real time control variables, carry out real-time monitoring to AAO oxidation ditch system according to working procedure.
The present invention is based on oxidation ditch, it is taked to the measures such as water-inlet carbon source distribution, set up anoxic pond in conjunction with improvement UCT process advantage to reflux to anaerobic pond, returned sluge is back to anoxic pond, set up on-line computing model, carry out real-time monitoring, to reach the object of high-efficient denitrification and dephosphorization and stable water outlet simultaneously.
The present invention regulates and controls the operational mode of aeration turn plate in main reaction region, sets up DO, NH
4 +the on-line computing model such as-N, adopt means such as " continuous aeration-intermittent aeration-dissolved oxygen control ", carry out real-time monitoring, optimizing power density and distribution, realize intensified denitrification and dephosphorization, stablize water outlet and energy-saving and cost-reducing object to system running pattern.
The core of sewage disposal process by activated sludge process is active sludge, for ensureing that biochemistry pool has metastable activated sludge concentration, generally refluxes to mud.Return sludge ratio is too low, and the quantity of the sludge concentration that can reduce reactor and the nitrifier participating in nitration reaction, makes nitrification effect be deteriorated; On the contrary, return sludge ratio is too high, can strengthen mud oxygen-consumption, increases hydraulic load and the disturbance of second pond, thus affects mud-water separation process and effluent quality.The present invention, by regulation and control oxidation ditch activated sludge concentration and return sludge ratio, reaches intensified denitrification and dephosphorization, stablizes the object of water outlet.
In the operational process of biological denitrification phosphorous removal technique system, flow-shape is one of key factor needing in design to consider, only has mixed solution to flow, and just can reach the object of fully reaction.If local velocity is too low in functional zone, then can cause deposition phenomenon, functional zone effective volume is reduced, and in functional zone, reaction is uneven, therefore needs to be optimized flow-shape in functional zone.The present invention is for reducing deposition phenomenon, assurance function district useful volume, and improve denitrogenation dephosphorizing efficiency, be optimized number of devices in functional zone and power, flow deflector is set up in subregion, thus reaches the object optimizing fluidised form.
AAO oxidation ditch real-time monitoring system of the present invention and sewage water treatment method beneficial effect as follows:
1) the nitrate contradiction of denitrogenation dephosphorizing simultaneously in traditional biological denitrification dephosphorization technique is solved, mixed solution internal reflux passage is established between anoxic pond and anaerobic pond, second pond returned sluge enters anoxic pond, nitrate is removed because of denitrification in anoxic pond, to avoid in returned sluge nitrate to the impact of anaerobic pond polyP bacteria anaerobic phosphorus release, and establish ORP on-line computing model to carry out Real-Time Monitoring to anaerobic pond internal oxidition reduction potential, and by PLC control system, the return current ratio of the mixed liquid of anoxic pond to anaerobic pond is regulated and controled, to improve polyP bacteria reaction environment in anaerobic pond, enhance anaerobic phosphorus release effect, adopt unpowered mixed-liquor return, reduce running cost.
2) solve the contradiction of anoxic pond denitrifying carbon source deficiency, hypothermic phase adopts anaerobic pond and anoxic pond to intake simultaneously, properly distributed dephosphorization and the carbon source ratio needed for denitrogenation.
3) anoxic pond sets up flow deflector, reasonable arrangement impeller position, optimizes flow velocity in ditch, avoids sludgd deposition and mud-water separation phenomenon, forms complete admixture, anoxic pond anti-nitration reaction is fully occurred in ditch.
4) set up impeller under water in oxidation ditch, avoid, in ditch, mud-water separation and sludgd deposition phenomenon occur; Optimize aeration turn plate quantity and operational mode, make to be formed in ditch the multistage AO environment that anaerobic-aerobic replaces, strengthened denitrification effect, and avoid the problem of the excessive or nitrated deficiency of aeration, realize object that is energy-saving and cost-reducing and strengthened denitrification.
5) online DO monitor I monitors the dissolved oxygen concentration of water outlet place in oxidation ditch, under ensureing out the prerequisite of pollutant in water complete oxidation, avoid the phenomenon of sludge bulking that second pond causes because dissolved oxygen is not enough and Mud up-floating, pass through PLC automatic control system, regulate aeration pattern and the running status of aeration turn plate, realize the real-time control to aeration rate, ensure standard water discharge, save energy consumption.
6) online DO monitor II monitors the dissolved oxygen concentration of ingress, nitrification liquid return flow line in oxidation ditch, avoiding entering under the prerequisite that dissolved oxygen higher in the nitrification liquid of anoxic pond impacts anoxic pond denitrification, realize the real-time control to aeration turn plate, energy efficient, ensures denitrification effect.
7) the redox potential value in online ORP monitor monitoring anaerobic pond, be back to the return current ratio of the mixed liquid of anaerobic pond by regulation and control anoxic pond, in guarantee anaerobic pond, polyP bacteria releases phosphorus effect.
8) online NO
3 -the nitrate at mixed-liquor return feeder connection place in-N monitor monitoring anoxic pond, guarantee the denitrification effect of anoxic pond and avoid being back to the higher nitric nitrogen that contains in the mixed solution of anaerobic pond and disadvantageous effect is caused to anaerobic phosphorus release, regulate and control mixed liquid recycle ratio simultaneously, maintain the biomass that anaerobic pond is enough, improve system phosphor-removing effect.
9) sludge concentration of online MLSS monitor monitoring oxidation ditch water outlet, ensure to have higher sludge loading in oxidation ditch, by regulation and control return sludge ratio, save energy, ensures standard water discharge.
10) online NH
4 +the ammonia nitrogen concentration of-N monitor monitoring oxidation ditch water outlet, ensures that water outlet can qualified discharge.
11) adopt on-line computing model to control, improve the controllability of system, handiness is high, simple to operate, easy to maintenance, achieves stable water outlet and energy-saving and cost-reducing object.
Accompanying drawing explanation
Fig. 1: the real-time control flow chart of the present invention;
Fig. 2: AAO oxidation ditch floor map of the present invention;
Fig. 3: aeration turn plate upstream and downstream device operating diagram in oxidation ditch;
Fig. 4: flow deflector operating diagram in anaerobic pond and anoxic pond;
Fig. 5: Float cylinder type impeller operating diagram in oxidation ditch;
1-anaerobic pond; 2-anoxic pond; 3-oxidation ditch; 4-training wall; 5-anoxic pond water-in; 6-oxidation ditch is to anoxic pond nitrification liquid return flow line; 7-DO on-line computing model II; 8-aeration turn plate; 9-impeller under water; 10-Float cylinder type impeller; 11-ORP on-line computing model; 12-NO
3 --N on-line computing model; 13-anoxic pond is to anaerobic pond mixed-liquor return passage; 14-flow deflector; 15-oxidation ditch water-in; 16-oxidation ditch flow-stopping plate; 17-oxidation ditch guide plate; 18-MLSS on-line computing model; 19-NH
4 +-N on-line computing model; 20-DO on-line computing model I; 21-oxidation ditch water outlet; 22-returned sluge.
Embodiment
Following examples explain technical scheme of the present invention further, but not as limiting the scope of the invention.
With reference to shown in Fig. 1,2,3,4,5, AAO oxidation ditch real-time monitoring system of the present invention, is made up of anaerobic pond 1, anoxic pond 2, oxidation ditch 3, on-line computing model and PLC control system;
Described anaerobic pond 1 and anoxic pond 2 bend adopt fillet pond type; Internal reflux mixed solution passage (namely anoxic pond is to anaerobic pond mixed-liquor return passage 13) is provided with between anaerobic pond and anoxic pond, nitrate transformation is that nitrogen is removed by second pond returned sluge 22 and oxidation ditch backflow nitrification liquid and in anoxic pond 2, denitrification occurs from the mixed solution of anaerobic pond; Simultaneously, mixed solution in anoxic pond 2 after denitrogenation is back to anaerobic pond 1 by return flow line 13, anaerobic phosphorus release effect is there is together with water inlet, because anoxic pond 2 is complete mixed reaction pond, it is very low that anoxic pond is back to nitrate concentration in the backflow mixed liquor of anaerobic pond, phosphorus impact is released on polyP bacteria very little, ensure that the sludge concentration of anaerobic pond simultaneously.
Described oxidation ditch 3 adopts two ditch formula, and bend adopts fillet pond type; Oxidation ditch water-in 15 is located at the first straight way place, and oxidation ditch is located at the 4th straight way place to anoxic pond nitrification liquid return flow line 6; By optimizing aeration turn plate quantity and operational mode, make the multistage AO environment that in oxidation ditch, formation aerobic-anaerobic replaces, constantly there is nitration and opposite nitration in mixed solution in oxidation ditch, and supplementing as anoxic pond denitrification denitrogenation, enhances denitrification effect; Oxidation ditch end the 4th straight way place is provided with nitrification liquid internal reflux passage (namely oxidation ditch is to anoxic pond nitrification liquid return flow line 6), and backflow nitrification liquid supplements the nitrate needed for anoxic pond denitrification.
By such scheme, be provided with three aeration turn plates 8 in described oxidation ditch 3, be positioned over second and third respectively, in four straight ways, aeration turn plate realizes the regulation and control of rotating speed by frequency transformer, each aeration turn plate upstream is provided with impeller 9 and flow-stopping plate 16 under water, and downstream is provided with flow deflector 17; Be provided with impeller 9 and a table flotation cartridge type impeller 10 under water in first straight way of described oxidation ditch, the two be combined with each other, and promotes current in ditch, optimize velocity flow profile in ditch, avoid sludgd deposition phenomenon to occur, promote simultaneous nitrification and denitrification to occur, strengthened denitrification effect in ditch.
By such scheme, anaerobic pond and anoxic pond bend place are provided with two pass training wall 4, and straight way place is provided with flow deflector 14; Described two pass training wall 4 object is the sludgd deposition phenomenon reducing bend place, strengthens the controlling role to current; Described flow deflector 14 is positioned over the downstream direction of impeller, and inclined angle alpha, α is 45 °-55 °, effect high velocity liquid at the bottom of pond being flowed through flow deflector causes middle part or the top of anaerobic pond or anoxic pond, to promote that levels liquid stream is uniformly distributed, optimize fluidised form in pond, reduce sludgd deposition and mud-water separation phenomenon, and promote that anoxic pond denitrification and anaerobic pond polyP bacteria release the full and uniform reaction of phosphorus, reach the effect of intensified denitrification and dephosphorization further.
By such scheme, be provided with redox potential (ORP) on-line computing model 11 in described anaerobic pond, and be connected with PLC control system; Described ORP on-line computing model is arranged between anoxic pond water-in 5 and anoxic pond to anaerobic pond return flow line 13.
By such scheme, in described anoxic pond, be provided with NO
3 --N on-line computing model 12, and be connected with PLC control system; Described NO
3 --N on-line computing model is arranged between anoxic pond water-in 5 and anoxic pond to anaerobic pond return flow line 13.
By such scheme, described oxidation ditch water outlet 21 place is provided with MLSS, NH
4 +-N, DO on-line computing model I (18,19,20) are all connected with PLC control system; Oxidation ditch is provided with DO on-line computing model II 7 to ingress, anoxic pond nitrification liquid return flow line 6 and is connected with PLC control system.
The sewage water treatment method of above-mentioned AAO oxidation ditch real-time monitoring system reply water inlet seasonal variation, comprises the following steps:
1) former water enters anaerobic pond 1, carries out anaerobic phosphorus release effect together with anoxic pond backflow mixed liquor, and ORP on-line computing model 11 gathers ORP value in anaerobic pond;
2) anaerobic pond mixed solution enters anoxic pond 2, refluxes together with nitrification liquid carry out denitrification, NO with second pond returned sluge 22 and oxidation ditch
3 --N on-line computing model 12 gathers nitrate nitrogen concentration in anoxic pond;
3) anoxic pond mixed solution enters oxidation ditch 3, MLSS, NH in oxidation ditch
4 +-N on-line computing model (18,19) gathers oxidation ditch water outlet sludge concentration and ammonia nitrogen concentration respectively, DO on-line computing model I 20 gathers the dissolved oxygen concentration of oxidation ditch water outlet, and DO on-line computing model II 7 gathers the dissolved oxygen concentration of oxidation ditch to ingress, anoxic pond return flow line; Mixed solution carries out simultaneous nitrification-denitrification effect in oxidation ditch; Second pond returned sluge is back to anoxic pond;
4) each on-line computing model is by the Signal transmissions that collects to PLC control system, calculates real time control variables, carry out real-time monitoring to AAO oxidation ditch system according to working procedure.
Embodiment 1: pliotherm period (> 25 DEG C):
The original state that each aeration turn plate runs is: A# aeration turn plate rotating speed 80r/min, B# aeration turn plate rotating speed 100r/min, C# aeration turn plate rotating speed 80r/min.Three aeration turn plates are stepless change regulation and control; Return sludge ratio R initial value is 80%; Anoxic pond is back to the return current ratio of the mixed liquid r of anaerobic pond
1be 70%; Oxidation ditch is back to the mixed liquid recycle ratio r of anoxic pond
2be 150%; Water inlet state is the water inlet of anaerobic pond single-point.
On this basis, regulate and control for following several situation:
The reading < 1.0mg/L of a, DO monitor I
The rotating speed of B# aeration turn plate is increased 10r/min, and monitor after continuing 1h, if also lower than normal range, then increase 50r/min, so repeatedly, maximum speed is no more than 130r/min again.
The reading > 2.0mg/L of b, DO monitor I
The rotating speed of B# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 10r/min, so repeatedly, minimum speed is not less than 70r/min again.If the rotating speed of B# aeration turn plate reaches Schwellenwert, and the DO monitor I continued after 1h monitors numerical value still higher than 2.0mg/L, then A# aeration turn plate is stopped aeration, until open A# aeration turn plate when reading reaches normal range.
The reading > 1.0mg/L of c, DO monitor II
The rotating speed of C# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 10r/min, so repeatedly, minimum speed is not less than 70r/min again.
The reading < 3000mg/L of d, MLSS monitor
Return sludge ratio R increases 10%, monitors after continuing 10h again, if or lower than normal range, then increase 10%, so repeatedly, the highest return sludge ratio R is not higher than 100%.
The reading > 5000mg/L of e, MLSS monitor
Return sludge ratio R reduces by 10%, monitors after continuing 1h again, if or higher than normal range, then reduce by 10%, so repeatedly, minimum return sludge ratio R is not less than 60%.
F, NO
3 -the reading > 5mg/L of-N monitor
Mixed liquid recycle ratio r
2reduce by 10%, monitor again after continuing 1h, if or higher than normal range, then reduce by 10%, and so repeatedly, minimum mixed liquid recycle ratio r
2be not less than 100%.
G, NH
4 +the reading > 3mg/L of-N monitor
By aeration turn plate A, B regulation and control to high speed operating mode (A rotating speed is 80r/min, B rotating speed is 130r/min), continue to monitor again after one hour, if or higher than normal range, then continue this state, until ammonia nitrogen concentration value is in normal range.
Reading >-the 100mV of h, ORP monitor
Return current ratio of the mixed liquid r
1reduce by 5%, monitor again after continuing 1h, if or higher than normal range, then reduce by 5%, and so repeatedly, minimum return current ratio of the mixed liquid r
1be not less than 50%.
Reading <-the 400mV of i, ORP monitor
Return current ratio of the mixed liquid r
1increase 5%, monitor again after continuing 1h, if or lower than normal range, then increase 5%, and so repeatedly, the highest return current ratio of the mixed liquid r
1not higher than 90%.
Whole technique concrete operation method regulates and controls by above step, and water inlet water temperature is 27.2 DEG C, at influent COD, TN, NH
4 +when-N, TP concentration are respectively 142mg/L, 32.9mg/L, 22.5mg/L, 2.77mg/L, corresponding water outlet COD, TN, NH
4 +-N, TP concentration are respectively 7mg/L, 6.9mg/L, 0.6mg/L, 0.38mg/L; Clearance is respectively 95.1%, 79.0%, 97.3%, 86.3%.Water outlet COD, TN, NH
4 +-N, TP are better than GB18918-2002 one-level A standard.
Embodiment 2: hypothermic phase (< 15 DEG C):
The original state that each aeration turn plate runs is: A# aeration turn plate rotating speed 100r/min, B# aeration turn plate rotating speed 100r/min, C# aeration turn plate rotating speed 100r/min.Three aeration turn plates are electrodeless variable-speed regulation and control.Return sludge ratio initial value is 80%; Mixed liquid recycle ratio is 250%; Adopt multipoint water feeding, anaerobic pond and anoxic pond water inlet ratio are 7:3; Anoxic pond is 70% to the return current ratio of the mixed liquid of anaerobic pond.
On this basis, regulate and control for following several situation:
The reading < 1.0mg/L of a, DO monitor I
The rotating speed of B# aeration turn plate is increased 10r/min, and monitor after continuing 1h, if also lower than normal range, then increase 10r/min, so repeatedly, maximum speed is no more than 130r/min again.
The reading > 2.0mg/L of b, DO monitor I
The rotating speed of B# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 50r/min, so repeatedly, minimum speed is not less than 70r/min again.
The reading > 1.0mg/L of c, DO monitor II
The rotating speed of C# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 10r/min, so repeatedly, minimum speed is not less than 70r/min again.
The reading < 4000mg/L of d, MLSS monitor
Return sludge ratio R increases 10%, monitors after continuing 10h again, if or lower than normal range, then increase 10%, so repeatedly, the highest return sludge ratio R is not higher than 100%.
The reading > 6000mg/L of e, MLSS monitor
Return sludge ratio R reduces by 10%, monitors after continuing 10h again, if or higher than normal range, then reduce by 10%, so repeatedly, minimum return sludge ratio R is not less than 60%.
F, NO
3 -the reading > 5mg/L of-N monitor
Mixed liquid recycle ratio r
2reduce by 10%, monitor again after continuing 1h, if or higher than normal range, then reduce by 10%, and so repeatedly, minimum mixed liquid recycle ratio r
2be not less than 180%.
G, NH
4 +the reading > 3mg/L of-N monitor
By aeration turn plate A, B regulation and control to high speed operating mode (A rotating speed is 100r/min, B rotating speed is 130r/min), continue to monitor again after one hour, if or higher than normal range, then continue this state, until ammonia nitrogen concentration value is in normal range.
Reading >-the 100mV of h, ORP monitor
Return current ratio of the mixed liquid r
1reduce by 5%, monitor again after continuing 1h, if or higher than normal range, then reduce by 5%, and so repeatedly, minimum return current ratio of the mixed liquid r
1be not less than 50%.
Reading <-the 400mV of i, ORP monitor
Return current ratio of the mixed liquid r
1increase 5%, monitor again after continuing 1h, if or lower than normal range, then increase 5%, and so repeatedly, the highest return current ratio of the mixed liquid r
1not higher than 90%.
Whole technique concrete operation method regulates and controls by above step, and water inlet water temperature is 14.2 DEG C, at influent COD, TN, NH
4 +when-N, TP concentration are respectively 239mg/L, 47.3mg/L, 32.4mg/L, 4.48mg/L, corresponding water outlet COD, TN, NH
4 +-N, TP concentration are respectively 15mg/L, 13.8mg/L, 2.1mg/L, 0.88mg/L; Clearance is respectively 93.7%, 70.8%, 93.5%, 80.4%.Water outlet COD, TN, NH
4 +-N is better than GB18918-2002 one-level A standard, and water outlet TP is better than GB18918-2002 one-level B standard.
Embodiment 3: aliquot (15-25 DEG C):
The original state that each aeration turn plate runs is: A# aeration turn plate rotating speed 100r/min, B# aeration turn plate rotating speed 100r/min, C# aeration turn plate rotating speed 100r/min.Three aeration turn plates are electrodeless variable-speed regulation and control.Return sludge ratio initial value is 80%; Mixed liquid recycle ratio is 200%; Water inlet state is single-point water inlet; The return current ratio of the mixed liquid of oxygen-starved area to anaerobic zone is 70%.
On this basis, regulate and control for following several situation:
The reading < 1.0mg/L of a, DO monitor I
The rotating speed of B# aeration turn plate is increased 10r/min, and monitor after continuing 1h, if also lower than normal range, then increase 10r/min, so repeatedly, maximum speed is no more than 130r/min again.
The reading > 2.0mg/L of b, DO monitor I
The rotating speed of B# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 10r/min, so repeatedly, minimum speed is not less than 70r/min again.If the rotating speed of B# aeration turn plate reaches Schwellenwert, and the DO monitor I continued after 1h monitors numerical value still higher than 2.0mg/L, then A# aeration turn plate is stopped aeration, until open A# aeration turn plate when reading reaches normal range.
The reading > 1.0mg/L of c, DO monitor II
The rotating speed of C# aeration turn plate is reduced 10r/min, and monitor after continuing 1h, if also higher than normal range, then reduce 10r/min, so repeatedly, minimum speed is not less than 70r/min again.
The reading < 4000mg/L of d, MLSS monitor
Return sludge ratio R increases 10%, monitors after continuing 10h again, if or lower than normal range, then increase 10%, so repeatedly, the highest return sludge ratio R is not higher than 100%.
The reading > 6000mg/L of e, MLSS monitor
Return sludge ratio R reduces by 10%, monitors after continuing 10h again, if or higher than normal range, then reduce by 10%, so repeatedly, minimum return sludge ratio R is not less than 60%.
F, NO
3 -the reading > 5mg/L of-N monitor
Mixed liquid recycle ratio r
2reduce by 10%, monitor again after continuing 1h, if or higher than normal range, then reduce by 10%, and so repeatedly, minimum mixed liquid recycle ratio r
2be not less than 150%.
G, NH
4 +the reading > 3mg/L of-N monitor
By aeration turn plate A, B regulation and control to high speed operating mode (A rotating speed is 100r/min, B rotating speed is 130r/min), continue to monitor again after one hour, if or higher than normal range, then continue this state, until ammonia nitrogen concentration value is in normal range.
Reading >-the 100mV of h, ORP monitor
Return current ratio of the mixed liquid r
1reduce by 5%, monitor again after continuing 1h, if or higher than normal range, then reduce by 5%, and so repeatedly, minimum return current ratio of the mixed liquid r
1be not less than 50%.
Reading <-the 400mV of i, ORP monitor
Return current ratio of the mixed liquid r
1increase 5%, monitor again after continuing 1h, if or lower than normal range, then increase 5%, and so repeatedly, the highest return current ratio of the mixed liquid r
1not higher than 90%.
Whole technique concrete operation method regulates and controls by above step, and inflow temperature is 19.7 DEG C, at influent COD, TN, NH
4 +when-N, TP concentration are respectively 206mg/L, 40.1mg/L, 27.8mg/L, 3.60mg/L, corresponding water outlet COD, TN, NH
4 +-N, TP concentration are respectively 11mg/L, 10.3mg/L, 1.2mg/L, 0.61mg/L; Clearance is respectively 94.7%, 74.3%, 95.7%, 83.1%.Water outlet COD, TN, NH
4 +-N is better than GB18918-2002 one-level A standard, and water outlet TP is better than GB18918-2002 one-level B standard.
Claims (4)
1. an AAO oxidation ditch real-time monitoring system, is characterized in that being made up of anaerobic pond, anoxic pond, oxidation ditch, on-line computing model and PLC control system;
The bend of described anaerobic pond and anoxic pond adopts fillet pond type; Anaerobic pond is provided with water-in to anoxic pond; Oxidation ditch to anoxic pond is provided with nitrification liquid return flow line; Second pond returned sluge, oxidation ditch backflow nitrification liquid and from the mixed solution of anaerobic pond in anoxic pond generation denitrification, be that nitrogen is removed by nitrate transformation; Meanwhile, anoxic pond to anaerobic pond is provided with mixed-liquor return passage, and the mixed-liquor return in anoxic pond after denitrogenation, to anaerobic pond, together with water inlet, anaerobic phosphorus release effect occurs;
Described oxidation ditch adopts two ditch formula, and bend adopts fillet pond type; Oxidation ditch water-in is located at oxidation ditch first straight way place, and oxidation ditch is located at the 4th straight way place to anoxic pond nitrification liquid return flow line; Make to be formed in oxidation ditch by aeration control the multistage AO environment that aerobic-anaerobic replaces, constantly there is nitration and opposite nitration strengthened denitrification effect in mixed solution in oxidation ditch; Oxidation ditch nitrification liquid is back to anoxic pond with the nitrate needed for supplementary denitrification denitrogenation;
Be provided with ORP on-line computing model in described anaerobic pond, and be connected with PLC control system; Described ORP on-line computing model is arranged between anoxic pond water-in and anoxic pond to anaerobic pond return flow line; NO is provided with in described anoxic pond
3 --N on-line computing model is connected with PLC control system; Described NO
3 --N on-line computing model is arranged between anoxic pond water-in and anoxic pond to anaerobic pond return flow line; Described oxidation ditch water outlet is provided with MLSS, NH
4 +-N, DO on-line computing model I, be all connected with PLC control system; Oxidation ditch to ingress, anoxic pond return flow line is provided with DO on-line computing model II and is connected with PLC control system.
2. AAO oxidation ditch real-time monitoring system as claimed in claim 1, it is characterized in that in described oxidation ditch, being provided with three aeration turn plates, be positioned over second and third respectively, in four straight ways, aeration turn plate realizes the regulation and control of rotating speed by frequency transformer, each aeration turn plate upstream is provided with impeller and flow-stopping plate under water, and downstream is provided with flow deflector; Impeller and a table flotation cartridge type impeller is under water provided with in first straight way of described oxidation ditch.
3. AAO oxidation ditch real-time monitoring system as claimed in claim 1, it is characterized in that anaerobic pond and anoxic pond bend place are provided with two pass training wall, straight way place is provided with two-stage flow deflector; Described flow deflector is arranged at the downstream direction of impeller under water, forms 45 ° of-55 ° of angles with the downstream water surface.
4. the sewage water treatment method of above-mentioned AAO oxidation ditch real-time monitoring system, comprises the following steps:
1) former water enters anaerobic pond, carries out anaerobic phosphorus release effect together with anoxic pond backflow mixed liquor, and ORP on-line computing model gathers ORP value in anaerobic pond;
2) anaerobic pond mixed solution enters anoxic pond, refluxes together with nitrification liquid carry out denitrification, NO with second pond returned sluge and oxidation ditch
3 --N on-line computing model gathers nitrate nitrogen concentration in anoxic pond;
3) anoxic pond mixed solution enters oxidation ditch, MLSS, NH in oxidation ditch
4 +-N on-line computing model gathers oxidation ditch water outlet sludge concentration and ammonia nitrogen concentration respectively, and DO on-line computing model I gathers the dissolved oxygen concentration of oxidation ditch water outlet, and DO on-line computing model II gathers the dissolved oxygen concentration of oxidation ditch to ingress, anoxic pond return flow line; Mixed solution carries out simultaneous nitrification-denitrification effect in oxidation ditch; Second pond returned sluge is back to anoxic pond;
4) each on-line computing model is by the Signal transmissions that collects to PLC control system, calculates real time control variables, carry out real-time monitoring to AAO oxidation ditch system according to working procedure.
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| CN105384249A (en) * | 2015-12-01 | 2016-03-09 | 刘国强 | Sewage treatment method and sewage treatment device integrating deep nitrogen and phosphorus removing and sludge-water gravitational separation |
| CN107746108A (en) * | 2017-11-23 | 2018-03-02 | 天津市华博水务有限公司 | A kind of oxidation ditch biological treatment system and method |
| CN110183061A (en) * | 2019-06-25 | 2019-08-30 | 青岛沐邦环境科技有限公司 | It is a kind of that internal carbon source denitrogenation dephosphorizing sewage disposal system and method are utilized based on oxidation ditch |
| CN110372093A (en) * | 2019-07-04 | 2019-10-25 | 昆明滇池水务股份有限公司 | A kind of multidimensional Precise control sewage disposal system and sewage water treatment method |
| CN111115858A (en) * | 2020-01-14 | 2020-05-08 | 中建环能科技股份有限公司 | Sewage treatment system capable of regulating aeration device and aeration device regulating method |
| CN111547933A (en) * | 2020-04-10 | 2020-08-18 | 安徽国祯环保节能科技股份有限公司 | AAO sewage treatment system and treatment method thereof |
| CN112047467A (en) * | 2020-08-07 | 2020-12-08 | 山东思源水业工程有限公司 | Intelligent efficient aeration biochemical system and automatic control method |
| CN113387458A (en) * | 2021-07-13 | 2021-09-14 | 湖南省建筑科学研究院有限责任公司 | Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process |
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| CN112047467B (en) * | 2020-08-07 | 2022-06-07 | 山东思源水业工程有限公司 | Intelligent efficient aeration biochemical system |
| CN113387458A (en) * | 2021-07-13 | 2021-09-14 | 湖南省建筑科学研究院有限责任公司 | Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process |
| CN113387458B (en) * | 2021-07-13 | 2023-03-14 | 湖南省建筑科学研究院有限责任公司 | Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process |
| CN113860496A (en) * | 2021-10-12 | 2021-12-31 | 山东建筑大学 | AAO (anaerobic-anoxic-oxic) external carbon source intelligent adding system and method based on BP (Back propagation) neural network |
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