CN2885848Y - Front-mounted short-range bio-denitrification control device for treating domestic sewage in denitrification process - Google Patents
Front-mounted short-range bio-denitrification control device for treating domestic sewage in denitrification process Download PDFInfo
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- CN2885848Y CN2885848Y CN 200620200383 CN200620200383U CN2885848Y CN 2885848 Y CN2885848 Y CN 2885848Y CN 200620200383 CN200620200383 CN 200620200383 CN 200620200383 U CN200620200383 U CN 200620200383U CN 2885848 Y CN2885848 Y CN 2885848Y
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Abstract
A short range biological denitrification control equipment of propositioned denitrifying art is used to treat life sewage, wherein a agitator is arranged in an anoxic tank and communicated with a water inlet, water chamber and water inflow pulp, an aero-tank is arranged in an aerobic tank, a secondary sedimentation tank is communicated with a water outlet, the bottom of the secondary sedimentation connects a surplus sludge discharging tube and a sludge returning tube, the sludge returning tube is communicated with the entrance of anoxic tank, in the middle connected with the sludge returning pulp, the inner circulating return pipe and inner circulating return pulp are connected between the entry of the aerobic tank and the entrance of the anoxic tank, a ORP sensor is arranged in the anoxic tank, a DO sensor and a PH sensor are arranged in the aerobic tank; the inner circulating control device dynamically controls the inner circulating returning amount of the system; the aeration control device dynamically controls the aeration amount of the system. The utility model has the advantages of high efficiency of denitrification, simple art, low operating cost, flexible operating and managing, shock proof, small holding area, and prevention of sludge expansion.
Description
(1), technical field
The utility model belongs to a kind of biological sewage treatment Controlling System.
(2), background technology
The bio-denitrifying sewage technology is an important research direction in the current water pollution control field, has caused the common concern of countries in the world.Adopt conventional second-stage treatment activated sludge process, nitrogen removal rate is only between 10%-30%.Therefore, for municipal effluent, nitrogenous trade effluent, adopt conventional Wastewater Treated by Activated Sludge Process, also can contain a large amount of nitrogen and phosphorus in the water outlet, along with becoming increasingly conspicuous of surface water body " eutrophication " phenomenon, impel people that conventional activated sludge technology is transformed, to improve the clearance of nitrogen, phosphorus.That the most representative is exactly A/O method, A
2Technologies such as/O method, wherein, A/O technology is the abbreviation of anoxic/aerobic (Anoxic/Oxic) biological denitrification process, though this technology is playing certain effect aspect the denitrogenation of waste water dephosphorization, but also expose simultaneously some problems, ubiquity weakness such as long flow path, energy consumption height, nitric efficiency are low, processing cost height.Therefore, research and development biological denitrification process and device efficient, less energy-consumption become current field of water treatment important research project.
Biological denitrification process is mainly finished jointly by two-stage process, promptly by nitrification ammonia nitrogen is converted into nitrate nitrogen, by denitrification nitrate nitrogen is converted into nitrogen again and overflows from water.In the nitrated stage, it is by independently two differential responses finishing of bacterium catalysis of two classes that ammonia nitrogen is converted to nitrate, at first by Nitrosomas (Nitrosomonas) ammonia nitrogen is converted into nitrite (NO
2 -), by Nitromonas (Nitrobacter) nitrite is converted into nitrate (NO then
3 -).The final product of nitrification is a nitrate in the traditional biological denitrification process, and denitrification is with NO
3 -Be electron acceptor(EA).In fact, from the microbial transformation process of nitrogen, it is by independently two differential responses finishing of bacterium catalysis of two classes that ammonia nitrogen is oxidized to nitrate nitrogen, should separate.For denitrifying bacteria, no matter be that nitrite or nitrate all can be used as final hydrogen acceptor, thereby whole biological denitrification process also can be through NH
4 +→ NO
2 -→ N
2Such approach is finished, and people are defined as the short-cut nitrification and denitrification biological denitrification process to the technology of carrying out denitrogenation through this approach.From reaction mechanism, short distance nitration-denitrification reduces by two steps than complete nitrification-denitrification, thereby can save aerobic stage oxygen-supplying amount about 25% theoretically; Save the required carbon source about 40% of denitrification; Reduce the mud growing amount; Reduce the throwing alkali number of nitrifying process; Shorten the reaction times, correspondingly reduce about reactor volume 30%-40%.Therefore, this technology is significant for practical engineering application.
But, up to the present, both at home and abroad to the research major part of short-cut nitrification and denitrification based on intermittent operation technology-SBR method, and have the advantages that to adopt lab scale testing apparatus, treatment of simulated waste water, intermittent operation, can realize the short-cut nitrification and denitrification reaction at an easy rate by factors such as controlled temperature, pH, DO, the concentration of free ammonia.Yet about the research of Continuous Flow operational system short-cut nitrification and denitrification seldom,, generally be difficult to realize short-cut nitrification and denitrification because influence factor is more.Therefore to current its report that yet there are no both at home and abroad of research of the short-cut nitrification and denitrification of handling real life sewage A/O pilot test system.NO in addition
2 -Accumulation very unstable, Nitromonas can be promptly with NO
2 -Be converted into NO
3 -, therefore, cause the short distance nitration denitrification process of having realized to revert to the complete nitrification process again.
(3), utility model content
The purpose of this utility model provides a kind of Prepositive denitrification art breading sanitary sewage short range biological denitrification control device, solve A/O technology and realize system's short-cut nitrification and denitrification, keeps NO
2 -The problem of system optimized operation, on-line Control is stablized, realized to accumulation rate; And solve the traditional biological denitrification process because carbon source lacks the sewage water denitrification effect instability that causes, the problem that denitrification percent is lower.
The technical solution of the utility model:
This Prepositive denitrification art breading sanitary sewage short range biological denitrification control device comprises anoxic pond, Aerobic Pond and second pond, it is characterized in that:
Its anoxic pond is divided into the lattice chamber that at least two bottoms communicate, Aerobic Pond is divided at least five staggered up and down lattice chambers that communicate, agitator is arranged in the anoxic pond, and and water inlet pipe, water tank and intake pump are communicated with, be provided with aerator in the Aerobic Pond, second pond is communicated with rising pipe, water-in is intake continuously, the water outlet continuous effluent, the second pond bottom connects excess sludge shore pipe and mud return line, mud return line and anoxic pond inlet is communicated with, connects sludge reflux pump therebetween, the Aerobic Pond outlet be connected inner circulating reflux pipe and inner circulating reflux pump between anoxic pond enters the mouth, the redox potential transmitter is set in anoxic pond, be the ORP transmitter, the dissolved oxygen concentration transmitter is set in Aerobic Pond, be i.e. DO transmitter and pH transmitter;
Inside cycle controller input ORP set(ting)value and by the measured value of ORP sensor detecting, by the internal recycle controller ORP set(ting)value is compared with the ORP measured value, export corresponding internal recycle controlled variable according to the inside circulation return pipe of the difference that relatively obtains, the inner circulating reflux amount of kinetic control system;
DO transmitter and pH transmitter are to aeration rate controller input DO concentration value and pH measured value, by the aeration rate controller DO set(ting)value is compared with the DO concentration value, and the pH set(ting)value compared with the pH measured value, according to the gas blower input aeration rate corresponding control information of the difference that relatively obtains to the control aeration rate, the aeration rate of kinetic control system;
Above-mentioned internal recycle controller and aeration rate controller are micro-chip or computer, comprise input keyboard and analog(ue)digital transformer; Be used to store the storer of above-mentioned ORP, DO, pH detected value and set(ting)value; Be used for and gather the comparer that above-mentioned ORP, DO, pH measured value and ORP, DO, pH set(ting)value compare; The microprocessor of calculation control amount deviation; Export the signal output apparatus of control signal through the gas blower of inside circulation return pipe of digital analog converter and control aeration rate.
The beneficial effect that utility model is compared with conventional art:
The utility model (is promptly regulated and is controlled according to the variation of the raw water quality water yield, guaranteeing that the water outlet ammonia nitrogen satisfies under the prerequisite of emission standard, realizes NO the control of DO concentration and aeration rate
2 -The stability of accumulation, and save energy consumption) be the key point that technology realizes short-cut nitrification and denitrification, system high efficiency steady running.The utility model is at different sanitary sewage water quality, under normal temperature condition, DO that selection can onlinely detect, the time of response is short, tolerance range is higher and pH transmitter, Changing Pattern by each lattice chamber DO concentration of on-line determination aerobic zone and pH value, thereby the process of clear and definite organic matter degradation, nitration reaction, the relation of clear and definite in addition different DO concentration and nitration reaction type, synchronous nitration and denitrification phenomenon, thereby aeration rate is accurately controlled, solve A/O technology short-cut nitrification and denitrification and realize difficulty, NO
2 -The accumulation problem of unstable.The utility model has obtained the span of control of DO concentration through a large amount of experimental studies, and DO, pH Changing Pattern and degree of nitration, nitrated type have dependency preferably.In order to realize that traditional denitrification process is converted into the short-cut nitrification and denitrification operation scheme fast, set up A/O technology short-cut nitrification and denitrification process intensification system, thereby started the short-cut nitrification and denitrification process at full speed.In addition, solved the inner circulating reflux quantity not sufficient and caused system's denitrification insufficient, nitric efficiency reduces; And the inner circulating reflux amount is excessive, causes water-inlet carbon source to be consumed, and the problem that the inner circulating reflux working cost increases has realized the optimization and the control of inner circulating reflux amount.
The utility model has overcome traditional denitride technology and has lacked stable operation and the defective that can not on-line Control optimized, the steady running and the on-line Control of short-cut nitrification and denitrification biological denitrificaion have been realized, in A/O technology pilot plant, handle under the real life sewage condition, realized the short-cut nitrification and denitrification reaction by control DO concentration; It is stable that real-time control aeration rate can be kept system's nitrite accumulation rate at normal temperatures.The ORP value of keeping the oxygen-starved area end by dynamic control inner circulating reflux amount is in the optimal control scope, can realize the optimal control of anti-nitration reaction.This method not only can be controlled stable nitrite accumulation in the reaction system, makes nitrated type-stable on short distance nitration, and has that technology is simple, working cost is low, management is flexible, nitric efficiency is high, throws carbon source advantage such as less outward.After the utility model is realized A/O technology short-cut nitrification and denitrification, can save 40% carbon source in the denitrification stage, therefore when water-inlet carbon source one timing, adopt short-cut nitrification and denitrification technology can obviously improve system's denitrification percent, can solve the insufficient problem of traditional technology denitrifying carbon source to a certain extent, be specially adapted to low C/N and compare domestic sewage treating.
Can fully guarantee the denitrification environment of anoxic pond in addition by control inner circulating reflux amount, avoid the inner circulating reflux quantity not sufficient, thereby can't bring into play the denitrification potentiality of oxygen-starved area, cause the possibility that the nitrate nitrogen removal descends, the water outlet nitrogen concentration exceeds standard discharging.Increase systematic running cost usefulness when avoiding the inner circulating reflux amount excessive in addition and increase dissolved oxygen content in the phegma, oxygen will consume a part of carbon source as electron acceptor(EA), and the anaerobic environment of the system of destruction.
The low DO concentration A/O technology of control has not only realized short-cut nitrification and denitrification, obtains nitrification effect preferably, can save 15 ~ 25% aeration rate in addition with respect to complete nitrification.Aerobic zone can also be realized the synchronous nitration and denitrification phenomenon under the low in addition DO concentration, thereby further improves system's denitrification percent, reduction working cost.
Control aeration rate in good time, (short distance nitration is finished to avoid excessive aeration, still continue aeration) generation of phenomenon, under the nitrite accumulation condition, do not provide sufficient dissolved oxygen for Nitromonas, make in the reactor nitrite nitrogen of nitrated generation be back to the oxygen-starved area and be reduced to nitrogen, the environment of growth is not provided for Nitromonas, fundamentally suppresses the growth of Nitromonas.Therefore, fundamentally reduced short distance nitration, made the short distance nitration type more stable, lasting to the possibility that traditional complete nitrification transforms.
Adopt ORP, DO and the pH transmitter can not only onlinely detect, the time of response short and the precision height, be convenient to and as the computer interface of internal recycle controller and aeration rate controller.Because A/O technology is the most widely used biological denitrification process in China municipal sewage plant, therefore, the application of technology and pilot scale Controlling System thereof is realized and kept to A/O technology short-cut nitrification and denitrification, can control aeration rate and inner circulating reflux amount in real time according to the variation of the raw water quality water yield, the shortcoming of avoiding traditional denitride technology to exist, can not only improve operation stability, minimizing aeration energy consumption, the raising nitric efficiency of A/O technology, and the short distance nitration reaction process control of further other biological denitrification process of realization is also had important significance for theories and using value.
The utility model is used A/O technology pilot plant test device at normal temperatures and is handled real life sewage, low DO concentration in the controlling reactor, based on DO and pH on-line determination information, kinetic control system aeration rate and inner circulating reflux amount, can realize stable short-cut nitrification and denitrification reaction, the average accumulation rate of nitrous acid nitrogen is more than 85%, ammonia nitrogen removal frank can reach 95%, the water inlet COD/TN than (2.9) lower situation under, nitrogen removal rate can reach more than 72%, with respect to traditional complete nitrification denitrification denitrogenation theory, aeration rate can save 20%, and nitrogen removal rate can improve 15%.
(4), description of drawings
Fig. 1 is a Controlling System structural representation of the present utility model;
Fig. 2 is the graphic representation of the dependency of anoxic pond water outlet nitric nitrogen concentration and ORP value.
1-anoxic pond, 2-Aerobic Pond, 3-ORP transmitter, 4-internal recycle controller, 5-DO transmitter, 6-pH transmitter, 7-aeration rate controller, 8-aerator, 9-gas blower, 10-water tank, 11-water inlet pipe, 12-intake pump, 13-agitator, 14-second pond, 15-rising pipe, 16-excess sludge pipe, 17-mud return line, 18-inner circulating reflux pipe, 19-inner circulating reflux pump, 20-sludge reflux pump.
(5), embodiment
Embodiment: working process of the present utility model is referring to Fig. 1, at first pending sanitary sewage enters anoxic pond 1 from water tank 10 by intake pump 12 controls, returned sluge is back to anoxic pond 1 by second pond 14 by return sludge pump 20 simultaneously, active sludge is stirred by agitator 13 in anoxic pond, and the nitrification liquid that terminal backflow comes with Aerobic Pond, with nitric nitrogen (mainly based on nitrous acid nitrogen) is that electron acceptor(EA), organic carbon source are electron donor, by the effect of denitrifying bacteria, carry out anti-nitration reaction.High-ammonia-nitrogen sewage enters Aerobic Pond 2 then, carry out the nitration reaction of organic continuation degraded and ammonia nitrogen, utilize the ORP value of DO concentration, pH value and the oxygen-starved area end of DO transmitter 5, pH transmitter 6 and ORP transmitter 3 real time on-line monitoring aerobic zones, and input internal recycle controller 4 and aeration rate controller 7, by internal recycle controller 4 the ORP set(ting)value is compared with the ORP measured value, export corresponding internal recycle controlled variable according to the inside circulation return pipe of the difference that relatively obtains, the inner circulating reflux amount of kinetic control system; By the aeration rate controller DO set(ting)value is compared with the DO concentration value, and the pH set(ting)value is compared with the pH measured value, according to the gas blower input aeration rate corresponding control information of the difference that relatively obtains to the control aeration rate, the aeration rate of kinetic control system.Above-mentioned internal recycle controller and aeration rate controller are micro-chip or computer, comprise input keyboard and analog(ue)digital transformer; Be used to store the storer of above-mentioned ORP, DO, pH detected value and set(ting)value; Be used for and gather the comparer that above-mentioned ORP, DO, pH measured value and ORP, DO, pH set(ting)value compare; The microprocessor of calculation control amount deviation; Export the signal output apparatus of control signal through the gas blower of inside circulation return pipe of digital analog converter and control aeration rate.
In this embodiment, working volume is 300L, has eight lattice chambers (each lattice chamber volume is 37.5L), and wherein preceding two lattice chambers are anoxic pond, and back six lattice chambers are Aerobic Pond, and inside reactor has many slots can change the lattice number of chambers of reactor as required.Two lattice chambers, oxygen-starved area are equipped with the ORP transmitter among the figure, next six aerobic lattice chambers are equipped with six cover DO and pH on-line sensors, one cover DO and pH on-line sensor certainly is installed, but need to change locating of DO and pH, obtain the aerobic zone not DO and the pH value of apposition chamber, and observe the Changing Pattern of aerobic zone along DO concentration and pH value on the reactor plug-flow direction.
Realize determining of short-cut nitrification and denitrification DO concentration:
Fig. 3 is the relation of nitrite accumulation rate and DO concentration, keep the accumulation that DO concentration has realized nitrous acid nitrogen between 0.3-0.7mg/L (mean value is 0.5mg/L) time as seen from the figure for a long time, and nitrous acid nitrogen accumulation rate maintains higher level at last, this has illustrated that A/O technology has successfully realized the short-cut nitrification and denitrification reaction, improve DO concentration then, high DO operation about 10 days has destroyed system's short distance nitration reaction, and nitrous acid nitrogen accumulation rate descends rapidly.Reappear short-cut nitrification and denitrification once more, still need keep low DO concentration operation about 30 days.Mainly based under the low DO concentration, the big 2.2-2.4 of ratio increment speed ratio Nitromonas of Nitrosomas doubly, by reacting the Nitromonas in continuous inhibition or the elutriation system, Nitrosomas is accumulated gradually, finally cause the amount and the activity of Nitrosomas to be far longer than Nitromonas, so far, nitration product is mainly based on nitrite nitrogen.
Keep the control of short-cut nitrification and denitrification aeration rate:
Fig. 4 is the nitrated running status of not finishing.The water outlet ammonia nitrogen concentration is higher as seen from the figure, does not nitratedly finish, and the water outlet nitric nitrogen is based on nitrous acid nitrogen, and the nitrite accumulation rate is up to 93%.Because nitration reaction is carried out always, the pH value is always with speed decline faster, and the pH fall off rate is equal substantially.DO concentration maintains low DO level (0.4-0.6mg/L) substantially in the reaction process, does not have considerable change, and above-mentioned information shows that all system's nitration reaction do not finish.
Fig. 5 is the running status of nitration reaction when finishing in the last lattice of aerobic zone chamber, and nitration reaction is finished in the last lattice of aerobic zone chamber substantially as seen from the figure, and the concentration of nitrate nitrogen is very low in reactor, less than 0.5mg/L, and the nitrous acid nitrogen accumulation rate very high (96%) of system.Because nitration reaction is not finished, aerobic in front lattice chamber DO concentration is kept about 0.5mg/L substantially, when nitration reaction is near completion, just improves a little in the last lattice of aerobic zone chamber.The pH value descends gradually at aerobic zone, and originally aerobic lattice chamber fall off rate in front is very fast, and the aerobic lattice chamber in the back because ammonia nitrogen concentration reduces, can find that pH value changing down obviously reduces.Hence one can see that, and this operation conditions almost can satisfy all advantages, and at first effluent quality is better, and the water outlet ammonia nitrogen concentration satisfies emission standard; Nitrous acid nitrogen accumulation rate very high (greater than＞90%); Nitration reaction just in time stops when ammonia nitrogen is converted into nitrous acid nitrogen substantially fully, has avoided nitrous acid nitrogen to continue oxidation, therefore can save aeration rate; The online information of this in addition state correspondence obviously, be easy to measure, pH value fall off rate changes slow decline into by the quick decline that begins, fall off rate has reduced at least 5 times.
Fig. 6 is that nitration reaction shifts to an earlier date the running status when complete, has realized nitrated fully in aerobic zone four lattice chambers as seen from the figure.Along on the reactor plug-flow direction, ammonia nitrogen concentration reduces gradually.Because nitration reaction is finished in aerobic zone four lattice chambers, so in aerobic zone five lattice chambers and six lattice chambers, the nitrous acid nitrogen of generation continues to be oxidized to nitrate nitrogen, nitrous acid concentration reduces gradually, and the concentration of nitrate nitrogen raises gradually.When nitration reaction is not finished, can find that DO concentration maintains 0.5-0.7mg/L, the obvious hop of DO concentration when nitrated finishing (Δ DO＞1mg/L).PH at first descends in nitrifying process, and when nitration reaction was finished, the pH value rose, and therefore produces a flex point on the pH curve, and this flex point is called " ammonia nitrogen valley point ".The control aeration rate is kept the low DO concentration of aerobic zone, is generally 0.3-0.6mg/L.
The nitrous acid nitrogen accumulation rate of this operation conditions correspondence that hence one can see that is minimum, and causes the energy consumption waste.In order effectively to save working cost, it appears in position as far as possible that need above-mentioned two unique points of control rationally to occur in lattice chamber, reactor back, and one side guarantees finishing of nitration reaction like this, on the other hand also effective save aeration consumption.
By above three kinds of situations as can be known, aerobic zone DO concentration and pH value information correspondence the degree that nitration reaction carries out and whether are kept higher nitrous acid nitrogen accumulation rate.Regulate aeration rate and keep this key character of the slow decline of pH value information satisfied quick decline becoming (reducing by 5 times as quantitative information) of system with fall off rate by the initial stage, can realize the optimal control of aeration rate, thereby keep stable nitrous acid nitrogen accumulation rate.
The intensifying technology of A/O technology short-cut nitrification and denitrification process:
A, initial start stage keep higher air demand to the greatest extent, and the DO concentration that also will keep each lattice chamber of aerobic zone simultaneously is lower than 1.0mg/L, and reduces the DO concentration of aerobic zone gradually.Avoid on the one hand initial start stage system's nitrification effect when high DO concentration becomes low DO concentration too poor, the situation that the water outlet ammonia nitrogen concentration is too high; Low on the other hand DO concentration operation can to a certain degree suppress nitrous acid nitrogen oxidation bacterium, realizes short-cut nitrification and denitrification gradually.
B, adopt online process control, even under low DO, the back continuation aeration of also will avoiding nitration reaction to finish causes nitrous acid to continue to be oxidized to nitrate nitrogen.
Application Example: use A/O technology pilot plant test model shown in Figure 1, keeping into, water COD concentration is 250mg/L, aerobic zone DO concentration is controlled at about 0.5mg/L, the inner circulating reflux ratio is 2, return sludge ratio is 0.5, and flooding quantity is 30L/h, dynamically changes influent ammonium concentration, use above-mentioned on-line Control strategy, studied the treatment effect of system under the dynamic influent load.As Figure 10 is to be applied in the pairing water outlet ammonia nitrogen of line traffic control strategy, nitrate nitrogen and nitrous acid nitrogen concentration, and ammonia nitrogen and TN clearance and nitrous acid nitrogen accumulation rate.After adopting the short-cut nitrification and denitrification realization as seen from the figure and keeping technology and Controlling System thereof, although influent ammonium concentration has bigger fluctuation, but system's water outlet ammonia nitrogen concentration fluctuation is very little, basic realization is nitrated fully, the water outlet ammonia nitrogen concentration only is 0-1mg/l, because the control nitration reaction is finished in the last lattice of aerobic zone chamber, has therefore obtained higher nitrous acid nitrogen accumulation rate, mean value is 95%.Obtained 72% nitrogen removal rate in addition under the lower situation of water inlet C/N, with respect to the complete nitrification denitrification process, the water outlet nitrogen removal rate improves 15%, and air demand can reduce by 20%.Hence one can see that based on the control strategy of pH value fall off rate is feasible, not only can keep the nitrous acid nitrogen accumulation rate of stability and high efficiency, and can improve nitrogen removal rate, saves working cost.
In order to obtain stable nitrous acid nitrogen accumulation rate, not only keep the low DO concentration of aerobic zone, also need avoid fulfiling ahead of schedule of nitration reaction, also just avoid aerobic zone DO concentration generation hop.
In order to obtain stable nitrous acid nitrogen accumulation rate, can control aeration rate by (descending 5 times) this information that slows down soon based on aerobic zone pH value fall off rate, thereby realize that nitrous acid nitrogen farthest accumulates, keep the stable of system's short-cut nitrification and denitrification, avoid nitrous acid nitrogen to continue to be oxidized to nitrate nitrogen.
Have dependency preferably based on oxygen-starved area water outlet the concentration of nitrate nitrogen and ORP value, maintain-can realize between the 120--130mV optimum control of inner circulating reflux amount and anti-nitration reaction by control oxygen-starved area water outlet ORP value.
Set up an optimal control system that strengthens A/O technology short-cut nitrification and denitrification reaction process, thereby the swift start up system short-cut nitrification and denitrification reduced from the time of complete nitrification to the short distance nitration transition.
Claims (1)
1. a Prepositive denitrification art breading sanitary sewage short range biological denitrification control device comprises anoxic pond, Aerobic Pond and second pond, it is characterized in that:
Its anoxic pond is divided into the lattice chamber that at least two bottoms communicate, Aerobic Pond is divided at least five staggered up and down lattice chambers that communicate, agitator is arranged in the anoxic pond, and and water inlet pipe, water tank and intake pump are communicated with, be provided with aerator in the Aerobic Pond, second pond is communicated with rising pipe, water-in is intake continuously, the water outlet continuous effluent, the second pond bottom connects excess sludge shore pipe and mud return line, and mud return line is communicated with the anoxic pond inlet, connect sludge reflux pump therebetween, be connected inner circulating reflux pipe and inner circulating reflux pump, the redox potential transmitter that setting links to each other with the internal recycle controller in anoxic pond, i.e. ORP transmitter between Aerobic Pond outlet and the anoxic pond inlet; Dissolved oxygen concentration transmitter and the pH transmitter that links to each other with the aeration rate controller is set in Aerobic Pond, and the dissolved oxygen concentration transmitter is the DO transmitter;
Inside cycle controller input ORP set(ting)value and by the measured value of ORP sensor detecting, by the internal recycle controller ORP set(ting)value is compared with the ORP measured value, export corresponding internal recycle controlled variable according to the inside circulation return pipe of the difference that relatively obtains, the inner circulating reflux amount of kinetic control system;
DO transmitter and pH transmitter are to aeration rate controller input DO concentration value and pH measured value, by the aeration rate controller DO set(ting)value is compared with the DO concentration value, and the pH set(ting)value compared with the pH measured value, according to the gas blower input aeration rate corresponding control information of the difference that relatively obtains to the control aeration rate, the aeration rate of kinetic control system;
Above-mentioned internal recycle controller and aeration rate controller are micro-chip or computer, comprise input keyboard and analog(ue)digital transformer; Be used to store the storer of above-mentioned ORP, DO, pH detected value and set(ting)value; Be used for and gather the comparer that above-mentioned ORP, DO, pH measured value and ORP, DO, pH set(ting)value compare; The microprocessor of calculation control amount deviation; Export the signal output apparatus of control signal through the gas blower of inside circulation return pipe of digital analog converter and control aeration rate.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129257A (en) * | 2010-12-31 | 2011-07-20 | 周良全 | Extraction process field online PH detection and control system |
| CN102198978A (en) * | 2011-04-11 | 2011-09-28 | 北京城市排水集团有限责任公司 | Apparatus for realizing short-cut nitrification by membrane bioreactor and method thereof |
| CN102659288A (en) * | 2012-05-21 | 2012-09-12 | 重庆大学 | Low-carbon-source sewage treatment system for reinforcing denitrification and dephosphorization functions and method |
| CN103496788A (en) * | 2013-09-26 | 2014-01-08 | 浙江工商大学 | Rapid starting method of shortcut nitrification and denitrification in A/O (Anoxic/Oxic) process |
| CN108996687A (en) * | 2018-07-27 | 2018-12-14 | 济南大学 | A kind of short distance backflow intensifying anoxic/aerobic reactor nitrogen rejection facility and method |
-
2006
- 2006-04-17 CN CN 200620200383 patent/CN2885848Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129257A (en) * | 2010-12-31 | 2011-07-20 | 周良全 | Extraction process field online PH detection and control system |
| CN102129257B (en) * | 2010-12-31 | 2013-04-24 | 周良全 | Extraction process field online PH detection and control system |
| CN102198978A (en) * | 2011-04-11 | 2011-09-28 | 北京城市排水集团有限责任公司 | Apparatus for realizing short-cut nitrification by membrane bioreactor and method thereof |
| CN102659288A (en) * | 2012-05-21 | 2012-09-12 | 重庆大学 | Low-carbon-source sewage treatment system for reinforcing denitrification and dephosphorization functions and method |
| CN103496788A (en) * | 2013-09-26 | 2014-01-08 | 浙江工商大学 | Rapid starting method of shortcut nitrification and denitrification in A/O (Anoxic/Oxic) process |
| CN108996687A (en) * | 2018-07-27 | 2018-12-14 | 济南大学 | A kind of short distance backflow intensifying anoxic/aerobic reactor nitrogen rejection facility and method |
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