CN100569667C - Modified four-section water-feeding A/O deep denitrogenation device and course control method for use - Google Patents
Modified four-section water-feeding A/O deep denitrogenation device and course control method for use Download PDFInfo
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Abstract
Modified four-section water-feeding A/O deep denitrogenation device and course control method for use belong to the activated sludge process sewage treatment area.Existing technology can not reach advanced nitrogen, and the working cost height, and operation is complicated.The present invention deoxidation district of holding concurrently oxygen-starved area after the 4th section aerobic zone end is provided with, this zone is carried out carbon source at preceding paragraphs cumulative nitrate nitrogen and is added, set up nitrate nitrogen internal recycle facility at the 4th section aerobic zone, a part of nitrate nitrogen is back to the oxygen-starved area of first section of system, with denitrification capacity that makes full use of first section oxygen-starved area and the nitrate nitrogen load that reduces the oxygen-starved area, back, reduce carbon source throwing amount.In addition, at the 4th section aerobic zone the ammonia nitrogen on-line sensor is set, in the oxygen-starved area, back nitrate nitrogen and ORP on-line sensor is set, the online signal of collection comes the aeration rate and the outer carbon source dosage of Controlling System.The present invention can improve the nitration denitrification effect of four-section water-feeding A/O technology, and carbon source throwing amount is economized, and working cost is low, and control texture is simple.
Description
Technical field
The present invention relates to a kind of modified form subsection water inflow A/O biological denitrificaion treatment process and process controller of nitrogenous effluent, affiliated technical field is: the activated sludge process Sewage treatment systems is theory, method and the technology of control automatically.Be applicable to the advanced nitrogen of large, medium and small type town domestic sewage and nitrogenous trade effluent.
Background technology
Eutrophication problem is one of topmost water pollution problems of facing of various countries, the world today, although China's municipal sewage treatment rate improves constantly in recent years, do not obtain basic solution but pollute the body eutrophication problem that causes, even serious day by day trend is arranged by nitrogen, phosphorus.Large-scale freshwater lake of China and immediate offshore area all reach the eutrophic pollution of moderate or severe.China has increased total nitrogen, the highest permission emission concentration of total phosphorus in " the urban wastewater treatment firm pollutant emission standard " of new promulgation in 2002, simultaneously also the water outlet ammonia nitrogen has been proposed stricter requirement, the principal contradiction of visible sewage disposal is changed into the removal of nitrogen and phosphorus pollutants gradually by the removal of organic pollutant.Phosphorus in the sewage can be removed by dosing coagulant usually, but since nitrogen compound (as NH
4 +And NO
3 -) molecular weight ratio less, can't remove by adding medicament; In addition, if utilize membrane technique to remove nitrogen compound, only reverse osmosis membrane technology is the most effective, but this method cost is too expensive, is difficult to apply; And other membrane technology all can't effectively be removed nitrogen compound in the sewage as methods such as nanofiltration, micro-filtrations, so the removal of nitrogen is the difficult point and the emphasis of advanced treatment of wastewater, has only the bio-denitrification technology of utilization thoroughly to remove.
Subsection water inflow A/O technology is based on a kind of denitrogenation novel process that the A/O technological development gets up.This technology is made up of 2～5 sections anoxics/aerobic order usually, and former water enters reactor from the oxygen-starved area of each section respectively, for denitrification provides carbon source.But, because only carrying out nitration reaction, the sewage of final stage do not have the denitrification condition, water outlet must contain certain nitrate nitrogen.A method that improves subsection water inflow A/O technology nitric efficiency is to improve the system sludge reflux ratio, but return sludge ratio must have certain restriction, increasing backflow meeting impacts the hydraulic detention time of system, increase the hydraulic load and the solid loading of second pond, also the dissolved oxygen of final stage aerobic zone can be carried to first section oxygen-starved area, cause disadvantageous effect to anoxic denitrification.In addition, than sanitary sewage, need a large amount of outer carbon sources that adds to improve nitrogen removal rate for low C/N.Carbon source adds usually in the oxygen-starved area of system's final stage, and the back connects the aeration zone again to remove the residue carbon source, satisfies emission standard to guarantee water outlet COD.Like this, can not guarantee that the carbon source dosage is minimum on the one hand, on the other hand, increase the aeration working cost.Make four-section water-feeding A/O in fact be equivalent to three sections operations, the meaning of multipoint water feeding is had a greatly reduced quality, and can not fundamentally improve removal effect, working cost is also than higher.
Summary of the invention
The objective of the invention is limitation at existing four-section water-feeding A/O technology itself, process structure is transformed, and control by real-time process, the nitrification effect of Controlling System, denitrification effect and effluent COD concentration, make system under the prerequisite of saving working cost, reach the purpose of advanced nitrogen.Solve: 1. subsection water inflow A/O process structure restriction causes the limited problem of nitrogen removal rate.2. the advanced nitrogen dosing is big, and the high and problem that is difficult to reach processing requirements of working cost 3. advanced nitrogen control requires high, control texture complicated problems.
Know-why of the present invention
Modified four-section water-feeding A/O deep denitrogenation device and course control method for use, it is characterized in that end in traditional four-section water-feeding A/O technology is provided with the oxygen-starved area, back and carries out carbon source and add, and adopt carbon source to add and the aeration process control device, avoid water outlet COD, nitrate nitrogen and ammonia nitrogen to exceed standard, reach the advanced nitrogen purpose.
Concrete principle is as follows:
(1) modified four-section water-feeding A of the present invention/O technology, raw waste water divides four sections to enter reactor respectively, at the end of the 4th section aerobic zone, the deoxidation district of holding concurrently, oxygen-starved area, back is set, and only stirs, and does not carry out aeration, and sewage is not advanced in back oxygen-starved area, only adds carbon source.In addition, at the 4th section aerobic zone nitrate nitrogen internal reflux facility is set, the nitrate nitrogen part of the 4th section generation is back to the oxygen-starved area of first section of system, the carbon source that can make full use of first section oxygen-starved area water inlet is on the one hand carried out denitrification, can reduce the carbon source dosage of oxygen-starved area, back on the other hand, reduce working cost.
(2) exceed standard for avoiding oxygen-starved area, back carbon source to add excessive water outlet COD, and carbon source adds deficiency, water outlet nitrate exceeds standard, in the end aerobic zone is provided with nitrate on-line sensor on-line monitoring water outlet nitrate concentration, and be equipped with redox potential (ORP) transmitter, and avoid the control of nitrate transmitter malfunctioning, the data of online acquisition are through process controller, the output result acts on carbon source and adds volume pump, control carbon source dosage.In addition, at the 4th section aerobic zone the online instrument of ammonia nitrogen is set, the ammonia nitrogen concentration of monitoring water outlet in real time, and the ammonia nitrogen concentration numerical value of online acquisition is input to process controller, the output action of controller is in air compressor machine, and the Controlling System aeration rate is to guarantee nitrification effect, avoid the situation that nitrated not thorough water outlet contains a large amount of ammonia nitrogens to take place, reduce the TN clearance.
More than the use of structural improvement and process controller, the system that can guarantee reaches the purpose of advanced nitrogen under lower working cost.
Modified form subsection water inflow A provided by the invention/O deep denitrogenation process and process controller, sewage water storage tank 1 is connected with reactor 2 by water inlet pipe, reactor 2 through rising pipe be connected with settling tank 3, settling tank mud is back to the Reactor inlet end through sludge reflux pump 4.Reactor 2 is made up of first section anoxia cell chamber 5, first section aerobic lattice chamber 6, second section anoxia cell chamber 7, second section aerobic lattice chamber 8, the 3rd section anoxia cell chamber 9, the 3rd section aerobic lattice chamber 10, the 4th section anoxia cell chamber 11, the 4th section aerobic lattice chamber 12, it is characterized in that
The deoxidation district 13 of holding concurrently, oxygen-starved area, back is set behind aerobic lattice chamber 12, in aerobic lattice chamber 12 nitrification liquid inner loop pipeline 14 is set, connect internal circulation pump 15 nitrification liquid is back to first section anoxia cell chamber 5,12 install ammonia nitrogen on-line sensor 16 the 4th section aerobic lattice chamber, in oxygen-starved area, back 13 online nitrate transmitter 17 and ORP transmitter 18 are installed, the numerary signal of online acquisition is through the ammonia nitrogen signal input interface 20 of lead and computer 19, nitrate signal input interface 21, ORP signal input interface 22 connects, the output interface 23 of computer is through the digital input interface 25 of lead connection procedure controller 24, the output interface 26 of process controller 25 is exported control signal and act on the variable-frequence governor 27 of air compressor machine, control air compressor machine 28 aeration rates, the output interface 29 of process controller 24 is with control signal output and act on the variable-frequence governor 31 that carbon source adds volume pump 30, control carbon source dosage.
A kind of modified four-section water-feeding A provided by the invention/O deep denitrogenation process and course control method for use thereof is characterized in that,
The deoxidation district of holding concurrently, oxygen-starved area after the end of traditional four-section water-feeding A/O process system is provided with one, aeration not, only carry out anoxia stirring, nitrate nitrogen inner circulating reflux pipe 14 is set, the nitrate nitrogen mixed-liquor return is arrived first section oxygen-starved area 5 of system by inner circulating reflux pump 15 at the 4th section aerobic zone 12.
In the 4th section aerobic zone 12, ammonia nitrogen on-line sensor 16 is set, online acquisition ammonia nitrogen data, by lead with numerary signal input process controller, filtering process, calculate, obtain the process real time control variables, through 26 outputs of process controller output interface, act on the variable-frequence governor 27 of air compressor machine, the air output of control air compressor machine 28.When ammonia nitrogen concentration 〉=1.5mg/L, strengthen aeration rate; When ammonia nitrogen concentration≤0.5mg/L, reduce aeration rate.
In the aerobic zone 13 of back, nitrate nitrogen on-line sensor 17 is set, ORP on-line sensor 18, the numerary signal of online acquisition nitrate nitrogen and ORP, signal is input to process controller by lead, through filtering process, calculate, obtain the process control variable,, act on the variable-frequence governor 31 that carbon source adds volume pump 30 through 29 outputs of process controller output interface, control the dosage that outer carbon source adds volume pump, the removal of Controlling System nitrate nitrogen.In the control process that above-mentioned nitrate nitrogen is removed, for avoiding control fails, control process must satisfy following condition: when online nitrate nitrogen concentration≤0.5mg/L or absolute ORP value≤-100mV, stop to add carbon source; When the absolute value of online nitrate nitrogen concentration 〉=2mg/L or online ORP 〉=-80mV, begin to add carbon source.
This modified four-section water-feeding A/O deep denitrogenation process real-time control method is characterized in that,
At modified four-section water-feeding A/the 4th section aerobic zone of O reactor 12 the ammonia nitrogen on-line sensor is installed, is gathered the ammonia nitrogen numerary signal, as the real-time controlled variable of modified four-section A/O technology nitrifying process aeration rate control.To gather ammonia nitrogen value numerary signal through transmitter input analog(ue)digital transformer A/D, convert numerary signal to, on upper computer, show the concrete numerical value of on-line parameter; With numerary signal input process real-time controller, at first pass through filtering process again, compare, obtain the process real time control variables with control strategy.Convert output signal to current signal through digital analog converter D/A again, directly act on the variable-frequence governor of air compressor machine, adjust the air output of air compressor machine.
The control of denitrification process is as controlled variable with online nitrate nitrogen and ORP.In oxygen-starved area, back 13 nitrate nitrogen and ORP on-line sensor, online acquisition nitrate nitrogen and ORP numerical value are installed.Usually, the variation range of ORP is-300～300mV, and the variation range of nitrate nitrogen is 0～100mg/L.Consider accuracy, the scope that ORP is set is-400～-400mV, the variation range of nitrate nitrogen is 0～100mg/L, signal is all handled as correct signal in this scope.The nitrate nitrogen of online acquisition and ORP numerary signal convert numerary signal to through transmitter input analog(ue)digital transformer A/D, show the concrete numerical value of on-line parameter on upper computer; With numerary signal input process real-time controller, at first pass through filtering process again, compare, obtain the process real time control variables with control strategy.Convert output signal to current signal through digital analog converter D/A again, directly act on the variable-frequence governor that carbon source adds volume pump, adjust the carbon source dosage.
Beneficial effect of the present invention
The present invention improves traditional four-section water-feeding A/O process structure, by setting up the deoxidation district of holding concurrently, oxygen-starved area, back, sets up nitrate nitrogen internal recycle facility, the restriction that can avoid process structure itself to bring to nitric efficiency at the 4th section aerobic zone.In addition,, can guarantee that system is nitrated, the denitrification effect, and reduce systematic running cost and use by online process controller.
Modified four-section water-feeding A of the present invention/O deep denitrogenation process and process controller and method are compared with prior art, have following advantage:
(1) at system's end the deoxidation district of holding concurrently, oxygen-starved area, back is set, can carries out carbon source at the nitrate nitrogen that system produces previously and add, reduce water outlet nitrate nitrogen concentration, improve the TN clearance.And can avoid a large amount of dissolved oxygen to be back to the oxygen-starved area of first section of system, cause disadvantageous effect to anoxic denitrification with returned sluge.
(2) set up nitrate nitrogen internal recycle facility at the 4th section aerobic zone of system, the part nitrate nitrogen can be back to first section of system, can make full use of first section denitrification capacity on the one hand, can reduce the amount of the nitrate nitrogen that enters into the back aerobic zone on the other hand, reduce the carbon source dosage, reduce working cost.
(3) at the 4th section aerobic zone ammonia nitrogen on-line sensor online acquisition ammonia nitrogen numerical value is set, can guarantee nitrification effect on the one hand, make the water outlet ammonia nitrogen concentration meet the demands, can adjust aeration rate in real time at running situation on the other hand, save the aeration working cost.
(4) in the oxygen-starved area, back nitrate nitrogen on-line sensor and ORP on-line sensor are set, can adjust the carbon source dosage in real time, guarantee that the water outlet nitrate nitrogen reaches a very low level according to the online numerical value of nitrate nitrogen.The ORP numerical value of online acquisition is as another process control parameters, and it can avoid the nitrate nitrogen transmitter system's mistake control that error causes to occur.System is provided with the level that the water outlet nitrate nitrogen is a lower and non-zero, can avoid effluent COD concentration to exceed water quality standard, and the carbon source amount that system is added is minimum, and working cost is economized most.
(5) The whole control system is simple in structure, and the on-line measurement device is less, and operation is simple.
The advanced nitrogen of samll cities and towns' municipal effluent, trade effluent was handled during the present invention can be widely used in.
Description of drawings
Fig. 1 is modified four-section water-feeding A/O deep denitrogenation process and process controller synoptic diagram
Fig. 2 implements after modified four-section water-feeding A/O and the process control influent ammonia nitrogen and water outlet ammonia nitrogen concentration variation diagram in 1 day
Among Fig. 1,1-sewage water storage tank, 2-reactor, the 3-settling tank, 4-sludge reflux pump, first section anoxia cell chamber of 5-, first section aerobic lattice of 6-chamber, second section anoxia cell chamber of 7-, second section aerobic lattice of 8-chamber, the 3rd section anoxia cell chamber of 9-, the 3rd section aerobic lattice chamber of 10-, the 4th section anoxia cell chamber of 11-, the 4th section aerobic lattice chamber of 12-, the deoxidation district of holding concurrently, oxygen-starved area behind the 13-, 14-nitrification liquid inner loop pipeline, 15-connects internal circulation pump, 16-ammonia nitrogen on-line sensor, the online nitrate transmitter of 17-, the 18-ORP transmitter, 19-computer, 20-ammonia nitrogen signal input interface, 21-nitrate signal input interface, the 22-ORP signal input interface, the output interface of 23-computer, 24-process controller, 25-process controller input interface, the variable-frequence governor of 26-process controller output interface 27-air compressor machine, 28-air compressor machine, the output interface of 29-process controller, the 30-carbon source adds volume pump, the 31-variable-frequence governor.
Embodiment
With the real life sewage of certain university dependents' district discharging as experimental subjects (COD=220～350mg/L, TN=44～75mg/L).The multi-section water-inlet A that is adopted/O biological denitrification reactor dissolving 320L adopts four sections modified form A/O technologies, every section volume 80L, first, second and third each section of section oxygen-starved area dissolving 30L, the molten long-pending 50L of aerobic zone; The 4th section oxygen-starved area 30L, aerobic zone 40L, back oxygen-starved area volume 10L.At the 4th section aerobic zone nitrate nitrogen internal recycle facility is set.System is provided with 1 air compressor machine, and maximum air output is 8m
3/ h, minimum air output are 0.Reactor at first carries out the culturing sludge domestication, and the sludge concentration that domestication finishes each section of back is: the I section is 5～5.5g/L, and the II section is 4～4.5g/L, III section 2.8～3.2g/L.Reactor day is handled water yield 960L, and each section flooding quantity is 240L/d, and temperature of reaction is 20 ℃.
At the beginning of the system operation, the outlet aeration rate of air compressor machine is adjusted into 3m
3/ h, water inlet COD concentration is 180～200mg/L, ammonia nitrogen concentration is 50～55mg/L.The DO concentration signal that aerobic zone is gathered after the III section is all in 2.5～3.5mg/L scope, under the water inlet condition of this steady concentration, allow system stable operation 7d, begin the real time altering influent load then, and the opening process Controlling System, aeration rate and outer carbon source dosage are carried out process control.
The change of water quality rule of simulated domestic wastewater illustrates the working condition of modified four-section A/O deep denitrogenation process and process controller with change of water quality in 1 day and corresponding water outlet:
Four sections A/O process system cumulative volume 320L of tradition, every section volume 80L.Every section oxygen-starved area volume 30L, aerobic zone volume 50L.Transform first, second and third each section of section oxygen-starved area dissolving of back 30L, the molten long-pending 50L of aerobic zone; The 4th section oxygen-starved area 30L, aerobic zone 40L, back oxygen-starved area volume 10L.At the 4th section aerobic zone nitrate nitrogen internal recycle facility is set, and establishes the inner circulating reflux amount and equal total flooding velocity, i.e. 960L/d.
In the 4th section aerobic zone 12, the ammonia nitrogen on-line sensor is set, online acquisition ammonia nitrogen data, by lead with numerary signal input process controller, filtering process, calculate, obtain the process real time control variables, export through the process controller output interface, act on the variable-frequence governor of air compressor machine, the air output of control air compressor machine.When ammonia nitrogen concentration 〉=1.5mg/L, strengthen aeration rate; When ammonia nitrogen concentration≤0.5mg/L, reduce aeration rate.
In the aerobic zone of back, the nitrate nitrogen on-line sensor is set, the ORP on-line sensor, the numerary signal of online acquisition nitrate nitrogen and ORP, signal is input to process controller by lead, through filtering process, calculate, obtain the process control variable,, act on the variable-frequence governor that carbon source adds volume pump through the output of process controller output interface, control the dosage that outer carbon source adds volume pump, the removal of Controlling System nitrate nitrogen.In the control process that above-mentioned nitrate nitrogen is removed, satisfy following condition: when online nitrate nitrogen concentration≤0.5mg/L or absolute ORP value≤-100mV, stop to add carbon source; When the absolute value of online nitrate nitrogen concentration 〉=2mg/L or online ORP 〉=-80mV, begin to add carbon source.
Fig. 2 is for after adopting improvement four-section water-feeding A/O deep denitrogenation process and process controller and method, and system is to the removal effect figure of ammonia nitrogen.As can be seen, influent ammonia nitrogen changes greatly among the figure, and the maximum 1.5mg/L of water outlet ammonia nitrogen, and mean value is less than 1mg/L, the maximum 2mg/L of water outlet nitrate nitrogen concentration, and mean value is less than 1.0mg/L; The maximum 3.2mg/L of total nitrogen concentration, mean value is less than 2mg/L.
Modified four-section water-feeding A of the present invention/O deep denitrogenation process and process controller embodiment are referring to Fig. 1, sewage water storage tank 1 is connected with reactor 2 by water inlet pipe, reactor 2 through rising pipe be connected with settling tank 3, settling tank mud is back to the Reactor inlet end through sludge reflux pump 4.Reactor 2 is made up of first section anoxia cell chamber 5, first section aerobic lattice chamber 6, second section anoxia cell chamber 7, second section aerobic lattice chamber 8, the 3rd section anoxia cell chamber 9, the 3rd section aerobic lattice chamber 10, the 4th section anoxia cell chamber 11, the 4th section aerobic lattice chamber 12, it is characterized in that
The deoxidation district 13 of holding concurrently, oxygen-starved area, back is set behind aerobic lattice chamber 12, in aerobic lattice chamber 12 nitrification liquid inner loop pipeline 14 is set, connect internal circulation pump 15 nitrification liquid is back to anoxia cell chamber 5,12 install ammonia nitrogen on-line sensor 16 in aerobic lattice chamber, in oxygen-starved area, back 13 online nitrate transmitter 17 and ORP transmitter 18 are installed, the numerary signal of online acquisition is through the ammonia nitrogen signal input interface 20 of lead and computer 19, nitrate signal input interface 21, ORP signal input interface 22 connects, the output interface 23 of computer is through the digital input interface 25 of lead connection procedure controller 24, the output interface 26 of process controller 25 is exported control signal and act on the variable-frequence governor 27 of air compressor machine, control air compressor machine 28 aeration rates, the output interface 29 of process controller 24 is with control signal output and act on the variable-frequence governor 31 that carbon source adds volume pump 30, control carbon source dosage.
After adopting modified four-section water-feeding A/O advanced nitrogen and process controller and method, the final outflow water ammonia nitrogen is less than 2mg/L, and total nitrogen is less than 3mg/L, far below the desired ammonia nitrogen concentration of national grade one discharge standard (≤5mg/L) and total nitrogen concentration (≤15mg/L).
Claims (1)
1, the technological process control method of a kind of using modified type four-section water-feeding A/O deep denitrogenation device, this modified four-section water-feeding A/O deep denitrogenation device structure is, sewage water storage tank (1) is connected with reactor (2) by water inlet pipe, reactor (2) is connected with settling tank (3) through rising pipe, and settling tank mud is back to the Reactor inlet end through sludge reflux pump (4); Reactor (2) is made up of first section anoxia cell chamber (5), first section aerobic lattice chamber (6), second section anoxia cell chamber (7), second section aerobic lattice chamber (8), the 3rd section anoxia cell chamber (9), the 3rd section aerobic lattice chamber (10), the 4th section anoxia cell chamber (11), the 4th section aerobic lattice chamber (12) successively;
And the deoxidation district (13) of holding concurrently, oxygen-starved area, back is set behind the 4th section aerobic lattice chamber (12), in the 4th section aerobic lattice chamber (12) nitrification liquid inner loop pipeline (14) is set, internal circulation pump (15) is connected to first section anoxia cell chamber (5), ammonia nitrogen on-line sensor (16) is installed in the 4th section aerobic lattice chamber (12), online nitrate transmitter (17) and redox potential transmitter (18) are installed by the deoxidation district (13) of holding concurrently in the oxygen-starved area, back, the numerary signal of each on-line sensor respectively with the ammonia nitrogen signal input interface (20) of computer (19), nitrate signal input interface (21), redox potential signal input interface (22) connects, the output interface of computer (23) is through the digital input interface (25) of lead connection procedure controller (24), the aeration rate output interface (26) of process controller (24) is exported control signal and act on the variable-frequence governor (27) of air compressor machine, the variable-frequence governor of air compressor machine (27) is connected with air compressor machine (28), and the carbon source dosage output interface (29) of process controller (24) is with control signal output and act on the variable-frequence governor (31) that outer carbon source adds volume pump (30);
It is characterized in that:
Ammonia nitrogen on-line sensor (16) is set in the 4th section aerobic lattice chamber (12), online acquisition ammonia nitrogen data, with numerary signal input process controller, filtering process is calculated by lead, obtain the process real time control variables, through aeration rate output interface (26) output of process controller, act on the variable-frequence governor (27) of air compressor machine, the aeration rate of control air compressor machine (28), when ammonia nitrogen concentration 〉=1.5mg/L, strengthen aeration rate; When ammonia nitrogen concentration≤0.5mg/L, reduce aeration rate;
In the back aerobic zone is held concurrently oxygen-starved area (13), online nitrate nitrogen transmitter (17) is set, redox potential on-line sensor (18), the numerary signal of online acquisition nitrate nitrogen and redox potential, signal is input to process controller (24) by lead, through filtering process, calculate, obtain the process control variable, carbon source dosage output interface (29) output through process controller, act on the variable-frequence governor (31) that outer carbon source adds volume pump (30), control the dosage that outer carbon source adds volume pump, the removal of Controlling System nitrate nitrogen;
And satisfy following condition simultaneously: when the absolute value of online nitrate nitrogen concentration≤0.5mg/L or online ORP≤-100mV, stop to add carbon source; When the absolute value of online nitrate nitrogen concentration 〉=2mg/L or online ORP 〉=-80mV, begin to add carbon source.
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| EP2158165A4 (en) | 2007-05-10 | 2012-04-18 | Patrick T O'regan Jr | Systems, methods and components for water treatment and remediation |
| CN101570383B (en) * | 2009-06-10 | 2011-04-20 | 北京工业大学 | Advanced nitrogen and phosphorus removal device and process control method thereof |
| CN102101743B (en) * | 2011-01-11 | 2012-06-06 | 彭永臻 | Device and method for biological intensified shortcut biological nitrogen removal of municipal sewage |
| CN102126817B (en) * | 2011-04-27 | 2013-05-29 | 天津市市政工程设计研究院 | AO high-efficiency nitrogen and phosphorus removal system |
| KR20190069611A (en) * | 2012-03-09 | 2019-06-19 | 메타워터 가부시키가이샤 | Wastewater treatment device, wastewater treatment method, wastewater treatment system, control device, control method, and recording medium storing program |
| CN102690019A (en) * | 2012-05-08 | 2012-09-26 | 北京工业大学 | High-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater |
| CN103663867B (en) * | 2013-12-02 | 2015-01-07 | 北京工业大学 | Device and method of residual sludge alkaline fermentation and inner carbon source development technology coupled with A-A-O nitrogen and phosphorous removal system |
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2007
- 2007-06-28 CN CNB2007101180707A patent/CN100569667C/en active Active
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