CN2883357Y - A/O tech counter-nitration procedue sewage treatment controller - Google Patents
A/O tech counter-nitration procedue sewage treatment controller Download PDFInfo
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- CN2883357Y CN2883357Y CN 200620200043 CN200620200043U CN2883357Y CN 2883357 Y CN2883357 Y CN 2883357Y CN 200620200043 CN200620200043 CN 200620200043 CN 200620200043 U CN200620200043 U CN 200620200043U CN 2883357 Y CN2883357 Y CN 2883357Y
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Abstract
The utility model relates to an A/O denitrifying process sewage treatment control device; wherein, a reaction tank comprises an anaerobic pool, an aerobic pool and a secondary precipitation pool; wherein, an external carbon addition tube is communicated with an external carbon addition metering pump in the anaerobic pool; a respirometer sensor is arranged at the head of anaerobic pool, while a nitrate nitrogen sensor is separately arranged in the anaerobic pool and the aerobic pool; the sensors are connected with a respiratory analyzer and a nitrate nitrogen analyzer via leads, and then connected with a data signal input interface of the computer; a PID controller is arranged in the computer; the data signal output interface of the computer is connected with an actuating mechanism via the lead, while the internal circulating return pump relay and the external carbon addition metering pump relay of the actuating mechanism are separately connected with the valves of internal circulating return pump and external carbon addition metering pump via the interface. The utility model can solve such problems, as insufficient carbon source, poor denitrifying efficiency, excessive external carbon additions and higher operating cost while the water quality is ensured and the operating expense is saved.
Description
(1) technical field
The utility model relates to the automatic control device of a kind of biological sewage treatment device, particularly a kind of biological denitrification process.
(2) background technology
Eutrophication problem is one of topmost water pollution problems of facing of the world today.In recent years, though the wastewater treatment in China rate improves constantly, the water eutrophication problem that is caused by nitrogen and phosphorus pollution does not only solve, and serious day by day trend is arranged.Expert report contains the drinking-water, vegetables, grain, fish of nitrate nitrogen and nitrous acid nitrogen etc. after the people eats, a large amount of nitrite can make the people directly poison, and nitrate can be reduced to nitrite in human body, nitrite and blood of human body effect, form methemoglobin, make the people suffer from methemoglobinemia, but threat to life.Nitrite forms nitrosamines with the effect of secondary amine class in human body, it is carcinogenic, teratogenesis, mutagenic material when reaching doses in human body, but the serious harm HUMAN HEALTH.The removal that facts have proved nitrogen is the difficult point and the emphasis of sewage disposal, and it is the most reasonable feasible to have only the bio-denitrification technology of utilization to be only.Because the influence of the great variety of the city influent quality water yield and the fluctuation factors such as variation of seasonal temperature causes biological denitrificaion efficient not high, the urban sewage discharge standard is strict gradually to the requirement of water outlet total nitrogen in addition.Therefore how to improve bio-denitrifying sewage efficient, optimize the technology operational conditions, solve serious day by day water pollution problems, important in theory meaning and realistic meaning are all arranged from saving fund, raising wastewater treatment efficiency.The A/O biological denitrification process, it is the most widely used a kind of denitrification process in China municipal sewage plant, its biggest advantage is can make full use of biodegradable COD in the water into as the carbon source of anti-nitration reaction, can remove COD and nitrogenous compound effectively simultaneously.Two steps of this arts demand: (1) nitration reaction promptly is converted into ammonia nitrogen the process of nitrous acid nitrogen or nitrate nitrogen under aerobic condition; (2) anti-nitration reaction promptly under anaerobic environment is the process that the nitrous acid nitrogen that produces in nitrifying process of electron donor or nitrate nitrogen are converted into nitrogen with the organic carbon source.Nitration reaction is just controlled the reformulations of nitrogen, can not realize the removal of nitrogen, and anti-nitration reaction is just really realized effective removal of nitrogen, and therefore effectively the control anti-nitration reaction could be realized maximum denitrogenation.Existing technology is just kept the normal operation of system, does not have the operation optimal control of taking into account system, and causing the ton water current consumption of China municipal sewage plant is the nearly twice of developed country, and operational management personnel number is its several times.Because the huge fluctuation of Sewage Plant flooding velocity and water quality, the water inlet carbon-nitrogen ratio differs 6-10 doubly sometimes, be difficult to determine the accurate dosage of outer carbon source, you can realize denitrification process inner circulating reflux amount and these two the Parameter Optimization controls of outer carbon source dosage, thereby have also just limited further applying of A/O biological denitrification process.
(3) utility model content
The purpose of this utility model provides a kind of A/O technique denitrification process sewage disposal control device, solves the problem of denitrification process optimal control; Solve the problem of optimal control inner circulating reflux amount and outer carbon source dosage; Solve also that denitrification process is efficient, the problem of low consumption, steady running.
The technical solution of the utility model: this A/O technique denitrification process sewage disposal control device, by anoxic pond, Aerobic Pond and second pond are formed, it is characterized in that: its anoxic pond has a lattice chamber at least, Aerobic Pond has two placed in-line lattice chambers at least, the oxygen-starved area is communicated with water inlet pipe, agitator is arranged in the anoxic pond, 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 water inlet pipe, connects sludge reflux pump therebetween, be connected inner circulating reflux pipe and inner circulating reflux pump between Aerobic Pond outlet and the anoxic pond inlet, also be communicated with outer carbon source in the anoxic pond and add pipeline and add volume pump with outer carbon source;
Be provided with the spirometer transmitter at the anoxic pond head end, in anoxic pond and Aerobic Pond, be equipped with the nitrate nitrogen transmitter respectively; The sensor through lead and respiration monitoring instrument be connected with the input interface of computer data signal after the nitrate nitrogen determinator is connected, be provided with the PID controller in the computer, the data signal output interface of computer, connect topworks through lead, the inner circulating reflux pump rly. and the outer carbon source of topworks adds the volume pump rly. and is connected with the valve that the valve of inner circulating reflux pump, outer carbon source add volume pump respectively through interface.
Above-mentioned nitrate nitrogen transmitter is arranged on anoxic pond water outlet or the last lattice of anoxic pond chamber; Above-mentioned nitrate nitrogen transmitter is arranged on Aerobic Pond water outlet place or the last lattice of Aerobic Pond chamber.
Beneficial effect: the utility model control inner circulating reflux amount and outer carbon source dosage in real time when handling sanitary sewage, solves that the original system nitric efficiency is low, water outlet the concentration of nitrate nitrogen height, moves irrational problem, thereby the optimization of the system of realization moves.The nitrate nitrogen clearance can improve 8-12% after the control inner circulating reflux amount in real time, and the inner circulating reflux amount can reduce 20-40%; Control outer carbon source dosage in real time, the nitrate nitrogen clearance can improve 25-40%.The utility model may command denitrification process inner circulating reflux amount and outer carbon source dosage, can control inner circulating reflux amount, outer carbon source dosage size in real time according to the variation of the influent quality water yield, can not only improve the reliability of treatment system, reduce water outlet the concentration of nitrate nitrogen, reduce systematic running cost usefulness, and the on-line automatic control of further other activated sludge process of realization is also had important significance for theories and using value.By controlling the anaerobic environment that internal recycle can fully guarantee anoxic pond, avoid the inner circulating reflux quantity not sufficient, thereby can't give full play to the denitrification potentiality of oxygen-starved area, cause nitrate nitrogen fully not removed; Also avoid higher inner circulating reflux amount to cause a large amount of DO of aerobic zone to enter the oxygen-starved area in addition, thereby influence anoxic pond denitrification environment, and consume water-inlet carbon source.The utility model can improve denitrification efficient, improve the utilization ratio to water inlet COD, thereby strengthens the removal of nitrate nitrogen.The utility model can accurately obtain outer carbon source dosage in addition, replenish water inlet C/N than not enough, control by external carbon source dosage, it is excessive to avoid outer carbon source to add, increase the reagent consumption expense, increase the situation of sludge yield and oxygen-consumption, also avoid outer carbon source dosage deficiency simultaneously, can not realize that water outlet the concentration of nitrate nitrogen satisfies the requirement of emission standard.
The utility model may command inner circulating reflux amount, outer carbon source dosage.Improve denitrification efficient, the nitrate nitrogen that aerobic zone is generated is back to the oxygen-starved area, keeps oxygen-starved area nitrate nitrogen abundance, and anti-nitration reaction just can carry out smoothly, therefore needs control nitrate nitrogen quantity of reflux, guarantees farthest to utilize oxygen-starved area denitrification potentiality.In addition when emission standard is strict to the water outlet total nitrogen,, need satisfy the demand of denitrification to electron donor in order to guarantee denitrifyingly to carry out smoothly.When the carbon source in the water inlet is not enough, need additional carbon.Because the huge fluctuation of Sewage Plant flooding velocity and water quality, the water inlet carbon-nitrogen ratio differs 6-10 doubly sometimes, be difficult to determine the accurate dosage of outer carbon source, in order to address this problem, need the exploitation effective control strategy, guarantee that water outlet the concentration of nitrate nitrogen satisfies the effluent quality requirement, optimize outer carbon source usage quantity simultaneously, reduce systematic running cost and use.Therefore, research and develop biological denitrificaion control device and operation strategy thereof efficient, less energy-consumption, can further promote the application in practice of Prepositive denitrification technology.
The utility model compared with prior art has following advantage:
(1), can fundamentally solve existing inner circulating reflux quantity not sufficient of traditional control techniques and excessive problems such as constant inner circulating reflux amount, maximum raising system denitrification potentiality, raising reduces the amount that overflows to aerobic zone COD to the utilising efficiency of water inlet COD.
(2), can guarantee under water outlet total nitrogen concentration prerequisite up to standard, to save working cost according to the accurately definite outer carbon source dosage of the variation of the influent quality water yield.
(3), inner circulating reflux and outer carbon source add Controlling System, can guarantee under the underload situation, makes full use of into that water COD carries out denitrification, and do not need the outer carbon source of throwing, and can realize that water outlet the concentration of nitrate nitrogen is up to standard; And under the high situation of influent load, by the control that outer carbon source adds, also can realize with less relatively outer carbon source throwing amount, realize that the water outlet total nitrogen is up to standard.Not only increased system's operational flexibility, also can keep than stable water flow quality.
(4), whole technology finished by automatic control system, only needs two control loops, bookkeeping is convenient, expense is low, anti impulsion load is strong, is easy to use in biological denitrification process.
The utility model is at different influent qualities, inner circulating reflux amount and outer carbon source dosage are made corresponding adjusting and control, use online spirometer and the concentration of nitrate nitrogen determinator as external carbon source dosage of controlled variable and inner circulating reflux amount are controlled automatically.Not only avoided the excessive or inner circulating reflux amount of inner circulating reflux amount to cross the low defective that exists; Also can solve outer carbon source dosage and determine the problem of difficulty, use outer carbon source and add the feedforward-feedback control device and can obtain outer accurately carbon source dosage, solution A/O technology is owing to water-inlet carbon source deficiency, the problem that denitrification efficient is not high; And outer carbon source adds excessively, increases the problem of working cost.The utility model can improve the utilising efficiency of water inlet COD, the COD that reduction overflows to aerobic zone, save outer carbon source dosage, improve system's nitric efficiency, no matter up to standard for guaranteeing effluent quality this is, still saves working cost as far as possible, all has important use and be worth.
The utility model can be used for adopting the sewage work of A/O method or the treatment plant of preparing to adopt this technology, also can be applicable to the place that the strict area of water outlet the concentration of nitrate nitrogen or treat effluent are needed reuse, application of the present utility model can reduce water outlet the concentration of nitrate nitrogen efficiently, efficiently.
With the real life sewage of certain university dependents' district is that former water (TN=68-120mg/L, water inlet C/N is 3 than only for pH=7-7.8, COD=180-450mg/L) is former water.MLSS is at 3000-4000mg/L in the selected Prepositive denitrification technological reaction pond useful volume 300L, reaction tank, and aeration rate is 1-1.5m
3/ h, SRT maintain about 15d, temperature of reaction 20-23 ℃.Before adopting control, because water-inlet carbon source is not enough far away, denitrification is insufficient, nitrogen removal rate only 60%, and water outlet the concentration of nitrate nitrogen surpasses 20mg/L.After using control automatically, water outlet the concentration of nitrate nitrogen reduces greatly, maintains the 12mg/L place substantially.When outer influent ammonia nitrogen load is low, do not add outer carbon source, after only implementing internal recycle and controlling, can satisfy the standard of water outlet the concentration of nitrate nitrogen 12mg/L.The clearance of system COD, ammonia nitrogen and total nitrogen remains at more than 90%, 95% and 85%.Through facts have proved, inner circulating reflux pump operation expense can save 45%.
The utility model is selected can online detection and higher the concentration of nitrate nitrogen on-line determination instrument and the online spirometer of tolerance range, after making denitrification process realize control automatically as the Be Controlled variable of anti-nitration reaction, can in time dynamically change and adjusting inner circulating reflux amount, outer carbon source dosage according to the variation of the influent quality water yield and the requirement of effluent quality; Can hold the degree that anti-nitration reaction carries out exactly by the real-time change of oxygen-starved area the concentration of nitrate nitrogen and water outlet the concentration of nitrate nitrogen; Understand timely whether oxygen-starved area denitrification potentiality are fully utilized and whether water-inlet carbon source is abundant, solve traditional constant inner circulating reflux amount or constant inner circulating reflux than the excessive or low excessively phenomenon of the existing inner circulating reflux amount of control; The utility model can solve A/O technology because the water-inlet carbon source deficiency, and denitrification efficient is not high, and outer carbon source add excessive, the problem of working cost increase.The utility model will improve the automatic control level of municipal effluent and industrial effluent biological denitrification denitrification process greatly, no matter for guaranteeing that water outlet the concentration of nitrate nitrogen is up to standard, it is potential to make full use of the oxygen-starved area, still saves working cost as far as possible, all has important use and is worth.
(4) description of drawings
Fig. 1 is the structural representation of the utility model reaction tank body portion;
Fig. 2 is the structural representation of the utility model control device;
Fig. 3 is a control method synoptic diagram of the present utility model.
Among the figure, the 1-water inlet pipe, the 2-intake pump, the 3-anoxic pond, the 4-agitator, the 5-aerator, the 6-Aerobic Pond, the 7-second pond, the 8-rising pipe, 9-excess sludge shore pipe, the 10-sludge reflux pump, the 11-mud return line, 12-spirometer transmitter, 13-nitrate nitrogen transmitter, 14-spirometer determinator, 15-nitrate nitrogen determinator, the 16-computer, the 17-signal input interface, the 18-signal output interface, 19-topworks, the outer carbon source of 20-adds rly., 21-inner circulating reflux rly., the outer carbon source of 22-adds volume pump, 23-inner circulating reflux pump, 24-inner circulating reflux pipe, the 25-gas blower.
(5) embodiment
Referring to Fig. 1, the utility model mainly comprises anoxic pond 3, Aerobic Pond 6 and second pond 7, its anoxic pond has two placed in-line lattice chambers, Aerobic Pond has three placed in-line lattice chambers, the oxygen-starved area is communicated with water inlet pipe 1, agitator 4 is arranged in the anoxic pond, be provided with aerator 5 in the Aerobic Pond, second pond is communicated with rising pipe 8, and water inlet pipe is intake continuously, the rising pipe continuous effluent, the second pond bottom connects excess sludge shore pipe 9 and mud return line 11, mud return line 11 is communicated with water inlet pipe 1, connects sludge reflux pump 10 therebetween, Aerobic Pond outlet be connected inner circulating reflux pipe 24 and inner circulating reflux pump 23 between anoxic pond enters the mouth.Also being connected with outer carbon source in the anoxic pond adds pipeline and outer carbon source and adds volume pump 22.
Referring to Fig. 2, control section structure of the present utility model: intake by water inlet pipe 1 through intake pump 2, enter Prepositive denitrification technology anoxic pond 3 head ends, and stir by stirrer 4 and to keep the muddy water mixed effect, the anoxic pond water outlet enters Aerobic Pond 6, keep the aerobic condition of Aerobic Pond 6 by aerator 5, the Aerobic Pond water outlet enters second pond 7, and water outlet is by rising pipe 8 dischargings.Excess sludge is through 9 dischargings of excess sludge shore pipe, and returned sluge is back to anoxic pond 3 head ends by sludge reflux pump 10 by mud return line 11.Be provided with spirometer transmitter 12 at the anoxic pond head end, at anoxic pond water outlet or anoxic pond last lattice chamber and Aerobic Pond water outlet or the indoor nitrate nitrogen transmitter 13 that is equipped with of the last lattice of Aerobic Pond.Above-mentioned nitrate nitrogen transmitter is arranged on anoxic pond water outlet or the last lattice of anoxic pond chamber.Above-mentioned nitrate nitrogen transmitter is arranged on Aerobic Pond water outlet place or the last lattice of Aerobic Pond chamber.The sensor through lead and respiration monitoring instrument 14 be connected with the data signal input interface 17 of computer 16 after nitrate nitrogen determinator 15 is connected.The data signal output interface 18 of computer connects topworks 19 through lead.The outer carbon source of topworks add rly. 20 and inner circulating reflux rly. 21 through interface add volume pump 22 with outer carbon source respectively, nitrification liquid reflux pump 23 is connected.
Referring to Fig. 3, the autocontrol method of denitrification process
[1], with the concentration of nitrate nitrogen of biodegradable COD concentration, anoxic pond end and Aerobic Pond end in the water inlet of online spirometer transmitter and nitrate nitrogen sensor determination; The deviation of comparative measurement value and actual set value makes the terminal the concentration of nitrate nitrogen in oxygen-starved area maintain set(ting)value;
[2], the inner circulating reflux pump is held open state at any time, according to influent quality and effluent quality require dynamic adjustments inner circulating reflux pump valve door open degree, thereby regulate the inner circulating reflux amount;
[3], under low ammonia nitrogen or high water inlet COD load, outer carbon source added volume pump and was in closing condition this moment, only carry out the control of inner circulating reflux amount, be in set(ting)value 1-3mg/L with water outlet the concentration of nitrate nitrogen of oxygen-starved area end, inner circulating reflux amount maximum value is set at 5 times of flooding quantity;
[4], embodiment one, when effluent quality is had relatively high expectations, and influent ammonia nitrogen is loaded when higher, keep a higher relatively inner circulating reflux amount, inner circulating reflux is more constant than constant value or inner circulating reflux amount of getting between the 2.5-3.5, be in setting range 0.5-1.5mg/L with water outlet the concentration of nitrate nitrogen of keeping the oxygen-starved area, come the outer carbon source dosage of independent control by the switching of internal recycle flow pump;
In above-mentioned steps [4], when effluent quality is had relatively high expectations, and influent ammonia nitrogen loads when higher, adopts inner circulating reflux amount pump and outer carbon source to add volume pump and controls outer carbon source dosage jointly, when the water outlet nitrate nitrogen still can not satisfy emission standard, start outer carbon source and add volume pump; When water outlet the concentration of nitrate nitrogen is lower than set(ting)value, close outer carbon source and add volume pump, when the difference of water outlet the concentration of nitrate nitrogen measured value and its set(ting)value during, start outer carbon source and add volume pump greater than 1mg/L.
[5], return sludge pump is held open state, to keep the needed sludge concentration of Continuous Flow operation process reaction tank;
[6], the excess sludge shore pipe regularly opens, control SRT is 12-15d.
The main purpose of internal recycle control is in order to reduce the water outlet total nitrogen concentration, also promptly farthest to remove nitrate nitrogen in the oxygen-starved area, improving denitrification rate; And the essence of internal recycle control strategy is controlled the inner circulating reflux amount exactly and is in set(ting)value S to keep the terminal the concentration of nitrate nitrogen in oxygen-starved area
NO, ref, to make full use of into biodegradable COD in the water, improve oxygen-starved area denitrification potentiality, reduce the amount that overflows to the biodegradable COD of aerobic zone solvability.Obtain when set(ting)value is between the 1-3mg/L scope, can obtain effect preferably by a large amount of tests.Because the required working cost of inner circulating reflux adds required expense well below outer carbon source, therefore the utility model at first starts inner circulating reflux PID controller, control last lattice chamber, oxygen-starved area the concentration of nitrate nitrogen is 1-3mg/L, when water outlet the concentration of nitrate nitrogen is not up to standard, restarts outer carbon source and add the PID controller.
Outside starting during carbon source PID controller, outer carbon source add can independent control also can with the inner circulating reflux Comprehensive Control.These two kinds of control modes respectively have superiority: when outer carbon source adds independent control, have the advantage that control is simple relatively, precision is high, but may cause system's effluent quality fluctuation bigger because the inner circulating reflux amount is not controlled.And outer carbon source adds with inner circulating reflux associating PID controller and can overcome above-mentioned shortcoming, system's relative complex some.In fact relative other industry automatic control system, the utility model control is very simple, only needs two control loops, just can effectively control above-mentioned two controlled variable.So the independent control inner circulating reflux measures water water quality when not meeting the demands, start inner circulating reflux and outer carbon source generally speaking and add integrated control system, have only when water inlet COD concentration is very low, and when less fluctuation does not require, can adopt outer carbon source to add independent control effluent quality.
Operating procedure of the present utility model: at first treatment sewage is by the anoxic pond that enters Prepositive denitrification technology under the effect of water inlet peristaltic pump, active sludge is stirred by whipping appts in anoxic pond, and the nitrification liquid that backflow comes with Aerobic Pond, with the nitrate nitrogen is that electron acceptor(EA), organic carbon source are electron donor, effect by denitrifying bacteria, carry out anti-nitration reaction, thereby realize the removal of nitrogen.Keeping anoxic pond water outlet (or the last lattice of anoxic pond chamber) nitrate nitrogen by inner circulating reflux PID controller is in and regulates the inner circulating reflux amount in the 1-3mg/L scope.When water outlet the concentration of nitrate nitrogen can not satisfy emission standard or water outlet the concentration of nitrate nitrogen when higher, open outer carbon source and add the PID controller, starting outer carbon source adds and the inner circulating reflux integrated control system, and outside anoxic pond water inlet place adds carbon source, after water outlet the concentration of nitrate nitrogen can satisfy emission standard, stopping outer carbon source adds, independent control inner circulating reflux amount, and whether surpass 1mg/L with the deviation of water outlet the concentration of nitrate nitrogen measured value and its set(ting)value and determine whether opening outer carbon source and add volume pump.The water outlet of anoxic pond enters Aerobic Pond, the pressurized air that is provided by gas blower enters aerator by inlet pipe, with the form of micro-bubble to the efficient oxygen supply of active sludge intermixture, sewage is fully contacted with active sludge, and purpose is to utilize the microorganism in the active sludge that organic pollutant is further degraded and finishes the nitrification of nitrogenous compound.Water outlet enters second pond at last, carry out mud-water separation at this, supernatant is discharged by rising pipe, and mud concentrates in sludge bucket, wherein a part is discharged with the form of excess sludge, a part is back in the reaction tank by sludge reflux pump, to keep sludge concentration certain in the reaction tank.
Claims (2)
1. A/O technique denitrification process sewage disposal control device, by anoxic pond, Aerobic Pond and second pond are formed, it is characterized in that: its anoxic pond has a lattice chamber at least, Aerobic Pond has two placed in-line lattice chambers at least, the oxygen-starved area is communicated with water inlet pipe, agitator is arranged in the anoxic pond, 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 water inlet pipe, connects sludge reflux pump therebetween, be connected inner circulating reflux pipe and inner circulating reflux pump between Aerobic Pond outlet and the anoxic pond inlet, also be communicated with outer carbon source in the anoxic pond and add pipeline and add volume pump with outer carbon source;
Be provided with the spirometer transmitter at the anoxic pond head end, in anoxic pond and Aerobic Pond, be equipped with the nitrate nitrogen transmitter respectively; The sensor through lead and respiration monitoring instrument be connected with the input interface of computer data signal after the nitrate nitrogen determinator is connected, be provided with the PID controller in the computer, the data signal output interface of computer, connect topworks through lead, the inner circulating reflux pump rly. and the outer carbon source of topworks adds the volume pump rly. and is connected with the valve that the valve of inner circulating reflux pump, outer carbon source add volume pump respectively through interface.
2. A/O technique denitrification process sewage disposal control device according to claim 1 is characterized in that: above-mentioned nitrate nitrogen transmitter is arranged on anoxic pond water outlet or the last lattice of anoxic pond chamber; Above-mentioned nitrate nitrogen transmitter is arranged on Aerobic Pond water outlet place or the last lattice of Aerobic Pond chamber.
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| CN103408137A (en) * | 2013-07-17 | 2013-11-27 | 郑州大学 | Multi-point water-inflow circulating A/O (Anaerobic/Oxic) sewage treatment system and treatment process thereof |
| CN104402181A (en) * | 2014-11-17 | 2015-03-11 | 北京工业大学 | Device and method for residual sludge fermentation coupled AO biological denitrogenation |
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| CN103408137A (en) * | 2013-07-17 | 2013-11-27 | 郑州大学 | Multi-point water-inflow circulating A/O (Anaerobic/Oxic) sewage treatment system and treatment process thereof |
| CN104402181A (en) * | 2014-11-17 | 2015-03-11 | 北京工业大学 | Device and method for residual sludge fermentation coupled AO biological denitrogenation |
| CN104402181B (en) * | 2014-11-17 | 2016-03-02 | 北京工业大学 | A kind of method of excess sludge fermentation coupling AO biological denitrificaion |
| CN104743669A (en) * | 2015-04-03 | 2015-07-01 | 兰州交通大学 | Step-feed CAST nitrite denitrifying phosphorus removal method and process control device thereof |
| CN109231456A (en) * | 2018-09-04 | 2019-01-18 | 江苏孚璋生物技术有限公司 | A method of by adjusting reflux, when sludge loading controls full biological phosphate-eliminating AOO process sludge concentration |
| CN109231456B (en) * | 2018-09-04 | 2021-11-30 | 江苏孚璋生物技术有限公司 | Method for controlling sludge concentration of total biological phosphorus removal AOO process by adjusting reflux ratio and sludge load |
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| CN114380386A (en) * | 2022-01-22 | 2022-04-22 | 青岛理工大学 | Automatic control method and device for external carbon source addition in sewage treatment |
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