CN110182952A - A kind of compounded carbons dosage automatic feedback and regulating device for municipal sewage plant AAO technique - Google Patents
A kind of compounded carbons dosage automatic feedback and regulating device for municipal sewage plant AAO technique Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The present invention is a kind of compounded carbons dosage automatic feedback and regulating device for municipal sewage plant AAO technique, including sewage-treatment plant and control system, the sewage-treatment plant includes passing through the sequentially connected anaerobic treatment pool of pipeline, anoxic treatment pond, Aerobic Process for Treatment pond.The present invention adds non-uniform problem by what multi-point throwing device can solve carbon source, it can solve the metering difficulty problem of carbon source by compounded carbons storage tank and the dual calibration system of transfer tank, supply is solved the problems, such as not in time by the warning device of the Liquid level component of compounded carbons storage tank, it solves the problems, such as when to put by multi-level control technique and adds best and to add be best on a small quantity, to which what the synthesis of quaternity solved compounded carbons adds problem, reach and be precisely added to each applying unit, facilitates sewage plant control production cost.
Description
Technical field
The present invention relates to sewage treatment fields, and in particular to a kind of compounded carbons throwing for municipal sewage plant AAO technique
Dosage automatic feedback and regulating device.
Background technique
With economic rapid development and the quickening of urbanization process, the eutrophication problem of water body (nitrogen, phosphorus are excessive)
It becomes increasingly conspicuous, content of organics is very low in the sewage in city in south China, the imbalance of wastewater influent nutritive proportion.Typical south
The influent COD of existing municipal sewage plant is mostly in 100mg/L or so, and BOD is lower than 30%, and rainy season may be lower, and total values of nitrogen might is more
In 30mg/L or so, since BOD is low, biodegradability is poor, it is difficult to reach total nitrogen in increasingly strict level-one emission standard A and be lower than
The requirement of 15mg/L.
Mostly use AAO technique by nitrogenous compound in sewage under the action of microorganism in municipal sewage plant greatly at present,
By ammonification, the three-step reaction of nitrification and denitrification, achieve the purpose that denitrogenation.Organonitrogen compound ammonifiers effect
Under, decomposition and inversion is ammoniacal nitrogen, and under the action of nitrifier, ammoniacal nitrogen further decomposes oxidation, first with aerobic section through nitre
Change effect, by the synergistic effect of nitrobacteria and nitrite bacteria, converts nitrite nitrogen, nitre state by nitrification for ammonia nitrogen
Nitrogen converts nitrogen for nitrate nitrogen by denitrification under anoxic conditions, overflows the water surface and is discharged into atmosphere, participates in nature nitrogen
Circulation, largely reduce nitrogen substance in water, reduce the potentially danger of water outlet, achieve the purpose that the denitrogenation from waste water.
Because sewage network build it is not perfect, separate system sewage network is less, when have industrial wastewater into factory, Groundwater infiltration etc.
Reason causes the organic pollutant concentration in water not high, and lower using carbon source, the content of nitrogen and phosphorus is higher, BOD5/TN < 3 or
BOD5/TP < 20 (it is possible that existing simultaneously) so that biological carbon and phosphorous removal effect is undesirable.In this case, addition carbon source is
Most simple effective method.In order to realize that nitrogen phosphorus qualified discharge needs to keep certain in biological tank under such flow condition
Activated sludge in micro organism quantity, degrade to nitrogen and phosphorus, compare F/M this generates lower organic loading-food is micro-
Very low, extremely low food is micro- to will cause activated sludge aging disintegration than F/M, as shown below, causes effluent quality exceeded.Therefore
Under such water inlet environment, certain carbon source is required supplementation with to meet the growth demand of microorganism.Especially in biological tank
In denitrification process under anaerobic environment, a certain proportion of carbon source is needed to carry out denitrification process.For example, Shen Xiaoling is in " China
Water supply and drainage " deliver paper " deep bed denitrification filter pool sewage plant mention mark extension project in application ", it is indicated that in external carbon
In the case where source, operational effect is stablized, and water outlet indices are below level-one A standard, and especially TN can stablize lower than 5mg/
L.Money is quiet to publish thesis " the advanced treating pilot plant test of municipal sewage Leopold denitrification filter pool " on " water purification technology ", real
The effect of synchronous denitrification dephosphorizing is showed, it is 88.7% that filter tank, which is discharged nitrogen removal rate, and total tp removal rate is 79.2%.
And the mode that carbon source most at present adds is usually that empirical data adds simple artificial theoretical calculation, is not adapted to
Municipal sewage plant amount of inlet water is big at present and variation water quality causes the problem of being discharged superscalar data greatly；And this constant is thrown at present
The data source added is in the online data of water outlet, so that data feedback seriously lags, not only easy water outlet total nitrogen is exceeded, and
Can be added due to carbon source excess is led to be discharged COD there are risk of exceeding criterion, and increase operating cost.
Summary of the invention
It is a kind of for the compound of municipal sewage plant AAO technique object of the present invention is to provide on the basis of the prior art
Carbon source dosage automatic feedback and regulating device, can (under normal circumstances, concentration be bigger, and viscosity is got over to having viscosity or high concentration
Compounded carbons greatly), realization directly precisely add carbon source, it is ensured that sewage water outlet reaches expected treatment effect and reduces operation
Cost.It is described that technical scheme is as follows.
A kind of compounded carbons dosage automatic feedback and regulating device, feature for municipal sewage plant AAO technique exists
In, including sewage-treatment plant and control system, the sewage-treatment plant include passing through the sequentially connected Anaerobic Treatment of pipeline
Pond, anoxic treatment pond, Aerobic Process for Treatment pond, the anaerobic treatment pool are provided with sewage inlet, and sewage inlet front-end pipelines are equipped with electricity
Magnetic flowmeter and online dissolved oxygen instrument, the Aerobic Process for Treatment pond are provided with outlet of sewer, the anaerobic treatment pool top with it is compound
The connection of carbon source storage tank, the Aerobic Process for Treatment pond is connect with aerator, between the anaerobic treatment pool and the sewage inlet
It is provided with import total nitrogen on-line detector, the anoxic treatment pond is connect with Aerobic Process for Treatment pond by reflux line, the reflux
It is provided with recycle control valve on pipeline, anoxic nitrate nitrogen detector, the Aerobic Process for Treatment pond are provided between the Aerobic Process for Treatment pond
The outlet of sewer is provided with outlet total nitrogen on-line detector, the sewage inlet is provided with online dissolution oxygen detection, institute
Stating control system includes PLC controller, and the PLC controller can control import total nitrogen on-line detector, the detection of anoxic pond nitrate nitrogen
The monitoring operation of instrument, outlet total nitrogen on-line detector, recycle control valve；
The compounded carbons of sewage plant biochemistry pool use multi-point throwing device, the top tube and down tube including circular ring shape, it is described on
Manage identical with the down tube size and connected by connecting tube, the upper tube and the down tube input composite carbon by inlet tube
Source, the inlet tube are connect with compounded carbons storage tank, and the upper tube and the down tube export compounded carbons by outlet, on
The bottom of pipe and down tube is provided with a series of liquid outlet, and the liquid outlet of the upper tube and the liquid outlet of down tube are located at same hang down
Straight position, top tube and down tube inside compounded carbons flow direction are opposite.
First inventive point of the invention is to be solved in transmission process in multi-point adding using reverse two circuit pipeline
The small problem of the front big back pipe point amount of pipe point amount.So that addition is more evenly.
Preferably, the compounded carbons storage tank is connect with transfer tank by connecting tube, the connecting tube is provided with company
Port valve, the compounded carbons storage tank is consistent with the size of the transfer tank, and scale is provided on tube wall, and the compounded carbons are deposited
Storage tank is consistent with the initial composite carbon source reserves of the transfer tank, and the compounded carbons reserves of the transfer tank are fixed.
Second central inventive point of the invention is that compounded carbons storage tank and the dual calibration system of transfer tank can solve
The metering difficulty problem of carbon source can solve the metering difficulty problem of carbon source.Compounded carbons concentration is higher, and viscosity is bigger, easier to be viscous
Attached electrode, electric conductivity is deteriorated, so just will appear error after using for a period of time, especially because there is concentration height to cause viscosity big,
There is resistance big in pipeline and clings flow-meter probe and generate error.The compounded carbons storage tank may be implemented by communicating valve
It is consistent with the initial composite carbon source reserves of the transfer tank.Therefore, compounded carbons storage tank after a period of use, can pass through
The liquid level for calculating transfer tank and compounded carbons storage tank is poor, can calculate the dosage of compounded carbons storage tank.
Preferably, the compounded carbons storage tank is provided with Liquid level component, the Liquid level component includes liquid
Position meter, dosing metering pump, solenoid valve, the liquidometer are located in compounded carbons storage tank, and real-time monitoring liquid level is described to add
Medicine metering pump water inlet pipe and storage tank outlet connect, and are provided with solenoid valve, the dosing meter on the dosing metering pump water inlet pipe
Amount water pump outlet pipe is connect with the inlet tube of the multi-point throwing device, and the Liquid level component is connect with the control system.
For the economy of transport, compounded carbons concentration is higher under normal circumstances, and transportation cost is lower；But carbon source concentration
It is higher, it is more easily adhered electrode, therefore the sensor conductive that often will lead to Liquid level component is deteriorated, so having used one section
It just will appear error after time.It is poor by the transfer tank of front and the liquid level of compounded carbons storage tank, calculate composite carbon
The dosage of source storage tank, can with accurate feedback measure Liquid level component accuracy, and then can periodically (such as every four is small
When) carry out calibrating flow meter.After dual calibration system carrys out calibrated flow, control system is fed back to, control system passes through solenoid valve again
Flowmeter is adjusted, so that dosing metering pump reaches the flow control to compounded carbons, reaches that be precisely added to each application single
Member.
Preferably, the Liquid level component includes high position sensor, low sensors, the high position sensor setting
In the upper inside wall of compounded carbons storage tank, the lower inner wall of compounded carbons storage tank, the high position is arranged in low sensors
Sensor and the low sensors are provided with prior-warning device.
Third inventive point of the invention is the long-range prison that compounded carbons may be implemented in high position sensor and low sensors
Control, when the liquid level of compounded carbons storage tank is higher than high position sensor, compounded carbons are added in stopping；When liquid level is lower than low sensors
When, compounded carbons can be added；Ensure that compounded carbons are in the inventory status of a safety.
Preferably, the compounded carbons are soluble carbon source, the solubility carbon source is to contain glucose, molasses, second
The carbon source combination of 2 kinds in sour sodium, other soluble carbon sources or Multiple components.
Preferably, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship: QIt throws/ per small
When=(Y3-Y0)*C/N*QWater/ (COD value) * 24 hours；
Wherein QIt throwsFor the dosage of compounded carbons,
QWaterFor the treating capacity of sewage
Y0For it is described outlet total nitrogen on-line detector measured value,
Y3For the measured value of the import total nitrogen on-line detector；
C/N is fixed value；
COD value is the COD value of additional carbon.
The relational expression is named as relational expression 1.Relational expression 1 is that the dosage just started to process when sewage carbon source adds calculates
Formula, because just starting to process, water flows out not yet, exports the measured value i.e. Y of total nitrogen on-line detector0It is not have
, so taking the discharge value of national environmental standard as initial value.
Preferably, the compounded carbons, C/N value is 6；To ensure efficiencies of nitrogen removal.
Preferably, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship:
QIt throws=1.2* (4.51Y+3.57X) * QWater/(24*ρ*103),
Wherein, Y=Y2-Y0--- need the nitrate nitrogen concentration removed, mg/L；
The density of ρ compounded carbons
X --- originate the DO concentration of online dissolved oxygen instrument, mg/L；
Y2It is the nitrate nitrogen value of the nitrate nitrogen detector measurement of the anoxic pond.
The relational expression is named as relational expression 2.After adding a period of time according to relational expression 1, Y can be obtained0Value, at this time can be with
Correct dosage.It is more coarse since relational expression 1 is the initial stage, Y can be introduced2The value in this intermediate stage is modified.
Preferably, the Y2Amendments in measured value 20 minutes it is primary.
Preferably, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship:
Y2=(24*QIt throws/4.51ρ*QWater-0.79X)+Y0。
The relational expression is named as relational expression 3.Pass through the nitrate nitrogen online monitoring instruments and outlet total nitrogen on-line checking of anoxic pond
The combination of instrument, the online dissolved oxygen instrument of starting, the especially real-time monitoring data of initial dissolution oxygen correct relational expression 2 in real time
The nitrate nitrogen value of the nitrate nitrogen detector measurement of anoxic pond, has reached and more accurately adds purpose.
4th central inventive point of the invention be by relational expression 1-3, solve solution when put add it is best
And it adds on a small quantity as best problem.The COD monitor of Inlet and outlet water, the ammonia nitrogen on-line detector of Inlet and outlet water and nitrate nitrogen are supervised online
The real time monitoring of the combination of instrument, the online dissolved oxygen instrument of starting, especially nitrate nitrogen on-line computing model, the online dissolved oxygen instrument of starting is surveyed,
Especially in real time by result feedback to control system, variable is mainly contained into pond for nitrate nitrogen data and the data of the online dissolved oxygen of starting
Nitrate nitrogen (nitrite nitrogen is smaller, can be ignored), the online dissolved oxygen DO of starting, water inlet quantity total amount, Inlet and outlet water total nitrogen
Content, according to the control parameter of empirical data setting PLC before.Program directly calculates carbon with formula according to each variable data
Source output flow, it is adjustable at any time if a certain Parameters variation.Carry out the size of adjusting solenoid valve, to realize electromagnetic flowmeter
To the flow control of compounded carbons.Reach and is precisely added to each applying unit.
The beneficial effects of the present invention are as follows:
(1) present invention adds non-uniform problem by what multi-point throwing device can solve carbon source, passes through compounded carbons
Storage tank and the dual calibration system of transfer tank can solve the metering difficulty problem of carbon source, pass through the liquid level control of compounded carbons storage tank
The warning device of component processed solves the problems, such as supply not in time, adds most by the way that when multi-level control technique solution puts
It is good and add on a small quantity as best problem, thus the synthesis of quaternity solve compounded carbons add problem, reach essence
Standard is added to each applying unit, facilitates sewage plant control production cost；
(2) result is fed back to control system, variable root in real time by nitrate nitrogen data and the data of the online dissolved oxygen of starting
According to the control parameter of empirical data setting PLC before.Program directly calculates carbon source output according to each variable data with formula
Flow, it is adjustable at any time if a certain Parameters variation.Carry out the size of adjusting solenoid valve, to realize electromagnetic flowmeter to compound
The flow control of carbon source.Reach and is precisely added to each applying unit.
(3) compounded carbons dosing system safety coefficient height of the present invention, easy to use, Environmental Safety, being capable of large-scale promotion
Using.
Detailed description of the invention
Fig. 1 this system structural schematic diagram；
Fig. 2: present apparatus throwing device top view；
Fig. 3: present apparatus throwing device bottom view；
Fig. 4: this system compounded carbons storage tank and transfer tank schematic diagram；
Appended drawing reference: compounded carbons storage tank 1, upper tube 101, down tube 102, inlet tube 103, outlet 104, connecting tube
105, liquid outlet 106, sewage inlet 2, anaerobic treatment pool 3, anoxic treatment pond 4, Aerobic Process for Treatment pond 5, outlet of sewer 6, PLC control
Device 7, import total nitrogen on-line detector 8, anoxic nitrate nitrogen detector 9, outlet total nitrogen on-line detector 10, aerator 11, reflux
Control valve 12, reflux line 13, transfer tank 14, communicating valve 15, high position sensor 16, low sensors 17, liquidometer 18, electromagnetism
Valve 19, dosing metering pump 20.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
A kind of compounded carbons dosage automatic feedback and regulating device for municipal sewage plant AAO technique, such as Fig. 1 institute
Show, including sewage-treatment plant and control system, the sewage-treatment plant includes passing through the sequentially connected Anaerobic Treatment of pipeline
Pond 3, anoxic treatment pond 4, Aerobic Process for Treatment pond 5, the anaerobic treatment pool 3 are provided with sewage inlet 2,2 front-end pipelines of sewage inlet
Equipped with electromagnetic flowmeter (not shown) and online dissolved oxygen instrument (not shown), for measuring discharge and the online oxygen of real-time detection
Meltage, the Aerobic Process for Treatment pond 5 are provided with outlet of sewer 6, and 3 top of anaerobic treatment pool and compounded carbons storage tank 1 connect
Connect, the Aerobic Process for Treatment pond 5 is connect with aerator 11, be provided between the anaerobic treatment pool 3 and the sewage inlet 2 into
Mouth total nitrogen on-line detector 8, the anoxic treatment pond 4 are connect with Aerobic Process for Treatment pond 5 by reflux line 13, the reflux line
On be provided with recycle control valve 12, anoxic nitrate nitrogen detector 9, the Aerobic Process for Treatment pond 5 are provided between the Aerobic Process for Treatment pond 5
The outlet of sewer 6 is provided with outlet total nitrogen on-line detector 10, the control system includes PLC controller 7, the PLC
Controller 7 can control import total nitrogen on-line detector 8, anoxic nitrogen on-line detector 9, outlet total nitrogen on-line detector 10, reflux
The monitoring of control valve 12 is run.
As shown in Figures 2 and 3, the compounded carbons of sewage plant biochemistry pool use multi-point throwing device, including upper tube 101, under
Pipe 102, upper tube 101 and down tube 102 are connect with connecting tube 105, and upper tube 101 and down tube 102 pass through the input composite carbon of inlet tube 103
Source exports how many compounded carbons by outlet 104, and the bottom of upper tube 101 and down tube 102 is provided with a series of liquid outlet
106, and the liquid outlet 105 of the upper tube 101 and the liquid outlet 105 of down tube are located at same upright position, the upper tube 101 is under
On the contrary, such as upper tube 101 flows into compounded carbons clockwise, down tube 102 flows into 102 inside compounded carbons flow direction of pipe clockwise
Compounded carbons, therefore, multi-point throwing device can guarantee each liquid outlet 106 outflow compounded carbons amount be it is identical, gram
The big bring error of compounded carbons viscosity is taken.
As preferred embodiment, as shown in figure 4, the compounded carbons storage tank 1 and transfer tank 14 are connected by connecting tube
It connects, the connecting tube is provided with communicating valve 15, and the compounded carbons storage tank 1 is consistent with the size of the transfer tank 14, tube wall
On be provided with scale, the compounded carbons storage tank 1 is consistent with the initial composite carbon source reserves of the transfer tank 14, it is described in
The compounded carbons reserves for turning tank 14 are fixed.The compounded carbons storage tank 1 is provided with Liquid level component, the Liquid level group
Part includes liquidometer 18, dosing metering pump 20, solenoid valve 21, and the liquidometer 18 is located in compounded carbons storage tank 1, is supervised in real time
Liquid level is surveyed, 20 water inlet pipe of dosing metering pump is connect with storage tank outlet 19, on 20 water inlet pipe of dosing metering pump
It is provided with solenoid valve 21,20 outlet pipe of dosing metering pump is connect with the inlet tube 103 of the multi-point throwing device, the liquid
Position control assembly is connect with the control system.The Liquid level component includes high position sensor 16, low sensors 17, institute
The upper inside wall that compounded carbons storage tank 1 is arranged in high position sensor 16 is stated, the setting of low sensors 17 is stored in compounded carbons
The lower inner wall of tank 1, the high position sensor 16 and the low sensors 17 are provided with prior-warning device.
As preferred embodiment, the compounded carbons are soluble carbon source, the solubility carbon source be containing glucose,
The carbon source combination of molasses, sodium acetate, 2 kinds in other soluble carbon sources or Multiple components.
As preferred embodiment, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship
1:QIt throws/ per hour=(Y3-Y0)*C/N*QWater/ (COD value) * 24 hours；
Wherein QIt throwsFor the dosage of compounded carbons,
QWaterFor the treating capacity of sewage
Y0For it is described outlet total nitrogen on-line detector measured value,
Y3For the measured value of the import total nitrogen on-line detector；
C/N is fixed value；
COD value is the COD value of additional carbon.
Relational expression 1 is the dosage calculation formula just started to process when sewage carbon source adds, because just starting to process,
Water flows out not yet, exports the measured value i.e. Y of total nitrogen on-line detector0It is no, so taking national environmental standard
Discharge value is as initial value.National 1 grade standard is 15 (mg/L), calculates dosage with this.
As preferred embodiment, the C/N value of the compounded carbons is 6；To ensure efficiencies of nitrogen removal.
As preferred embodiment, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship
2:
QIt throws/ per hour=(Y2-Y0)*C/N*(QWater)/(COD value * 24 hours),
Y2It is the nitrate nitrogen value of the nitrate nitrogen detector measurement of the anoxic pond,
Y0For the measured value of the outlet total nitrogen on-line detector.
After adding a period of time according to relational expression 1, Y can be obtained0Value, can correct dosage at this time.Due to relational expression 1
It is the initial stage, it is more coarse, Y can be introduced2The value in this intermediate stage is modified.
As preferred embodiment, the amendments in measured value 20 minutes of the Y2 are primary.
As preferred embodiment, the dosage Q of the compounded carbonsIt throwsWith the treating capacity Q of sewageWaterMeet following relationship
3:
Y2=(24*QIt throws/4.51ρ*QWater-0.79X)+Y0；
Wherein, Y2It is the nitrate nitrogen value of the nitrate nitrogen detector measurement of the anoxic pond,
Y0For it is described outlet total nitrogen on-line detector measured value,
Y=Y2-Y0--- need the nitrate nitrogen concentration removed, mg/L；
QIt throws--- the dosage of compounded carbons, unit are l/h；
The density of ρ compounded carbons；
QWaterFor the treating capacity of sewage；
X --- originate the DO concentration of online dissolved oxygen instrument, mg/L.
Pass through the nitrate nitrogen online monitoring instruments of anoxic pond and the group of outlet total nitrogen on-line detector, the online dissolved oxygen instrument of starting
It closes, especially the real-time monitoring data of initial dissolution oxygen, is measured in real time to correct the nitrate nitrogen detector of the anoxic pond of relational expression 2
Nitrate nitrogen value, has reached and more accurately adds purpose.
Application Example
The process feedback of 1 relational expression 1 of Application Example is adjusted
Sewage treatment plant at existing Guangzhou one, is adding initial stage, carries out adding for carbon source, processing knot using relational expression 1
Fruit is as shown in table 1 below.Due to also untreated, so the initial value of Y3 is subject to the specified value of Chinese Ministry of Environmental Protection, dosage is calculated.Its
In, C/N 6, measurement COD value is 15.
Relational expression 1QIt throws/ per hour=(Y3-Y0)*C/N*QWater/ (COD value) * 24 hours, processing result is as shown in table 1.
1 initial stage of table adds processing result table
| Handle the time | QWater(m3/h) | Y3(mg/L) | Y0(mg/L) | QIt throws(m3/h) |
| 0 | 2000 | 21.5 | / | / |
| 20 minutes | 2015 | 20.2 | 17.23 | 0.055 |
| 40 minutes | 2004 | 22.3 | 16.36 | 0.110 |
| 1 hour | 1908 | 19.8 | 15.78 | 0.071 |
| 20 minutes 1 hour | 1990 | 23.05 | 15.13 | 0.145 |
| 40 minutes 1 hour | 2103 | 20.98 | 14.28 | 0.130 |
| 2 hours | 2009 | 24.06 | 13.97 | 0.187 |
As shown in Table 1, after 2 hours, QIt throwsIt has been able to tentatively meet Y3Value.At this point it is possible to the work of formula 2
Skill feedback regulation obtains centre and adds processing result table.
QIt throws=1.2* (4.51Y+3.57X) * QWater/(24*ρ*103)
Processing result table is added among table 2
| Handle the time | QWater | Y3 | Y0 | QIt throws(m3/h) |
| 2 hours | 2009 | 24.06 | 13.97 | 0.0980952 |
| 20 minutes 2 hours | 1998 | 23.01 | 13.03 | 0.0969 |
| 40 minutes 2 hours | 2014 | 21.98 | 11.99 | 0.0994 |
| 3 hours | 2005 | 22.09 | 12.85 | 0.0925 |
| 20 minutes 3 hours | 1999 | 22.76 | 13.12 | 0.0966 |
| 40 minutes 3 hours | 2000 | 23.21 | 12.04 | 0.01071 |
| 4 hours | 2005 | 23.54 | 12.46 | 0.01082 |
As shown in Table 2, after 2 hours, QIt throwsIt has been able to tentatively meet Y3Value.Herein, using the work of relational expression 3
Skill feedback regulation obtains finally stable adding processing result.
Y2=(24*QIt throws/4.51ρ*QWater-0.79X)+Y0；
Table 3 finally adds processing result table
Processing result is added it is found that the nitrate nitrogen online monitoring instruments and outlet total nitrogen for passing through anoxic pond by table 1- table 3
The combination of on-line detector, the online dissolved oxygen instrument of starting, the especially real-time monitoring data of initial dissolution oxygen, it is scarce to correct in real time
The nitrate nitrogen value of the nitrate nitrogen detector measurement in oxygen pond, has reached and more accurately adds purpose.Outlet drain value is well below country 1
Grade standard is 15 (mg/L), illustrates that the sewage handled is up to standard.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to the one of invention
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (10)
1. a kind of compounded carbons dosage automatic feedback and regulating device for municipal sewage plant AAO technique, which is characterized in that
Including sewage-treatment plant and control system, the sewage-treatment plant include by the sequentially connected anaerobic treatment pool of pipeline,
Anoxic treatment pond, Aerobic Process for Treatment pond, the anaerobic treatment pool are provided with sewage inlet, and sewage inlet front-end pipelines are equipped with electromagnetic current
Meter and online dissolved oxygen instrument, the Aerobic Process for Treatment pond are provided with outlet of sewer, the anaerobic treatment pool top and compounded carbons
Storage tank connection, the Aerobic Process for Treatment pond connect with aerator, is arranged between the anaerobic treatment pool and the sewage inlet
There is import total nitrogen on-line detector, the anoxic treatment pond is connect with Aerobic Process for Treatment pond by reflux line, the reflux line
On be provided with recycle control valve, anoxic nitrate nitrogen detector, the Aerobic Process for Treatment pond and institute are provided between the Aerobic Process for Treatment pond
It states outlet of sewer and is provided with outlet total nitrogen on-line detector, the sewage inlet is provided with online dissolution oxygen detection, the control
System processed includes PLC controller, the PLC controller control import total nitrogen on-line detector, anoxic pond nitrate nitrogen detector, outlet
The monitoring operation of total nitrogen on-line detector, recycle control valve；
The compounded carbons of sewage plant biochemistry pool use multi-point throwing device, the multi-point throwing device include circular ring shape upper tube and
Down tube, the upper tube is identical with the down tube size and is connected by connecting tube, and the upper tube and the down tube pass through inlet tube
Compounded carbons are inputted, the inlet tube is connect with compounded carbons storage tank, and the upper tube and the down tube are exported by outlet
Compounded carbons, the bottom of top tube and down tube are provided with a series of liquid outlet, and the liquid out of the liquid outlet of the upper tube and down tube
Mouth is located at same upright position, and compounded carbons flow direction is opposite inside the top tube and down tube.
2. according to regulating device described in claim 1, which is characterized in that the compounded carbons storage tank passes through with transfer tank to be connect
Pipe connection, the connecting tube are provided with communicating valve, and the compounded carbons storage tank is consistent with the size of the transfer tank, on tube wall
It is provided with scale, the compounded carbons storage tank is consistent with the initial composite carbon source reserves of the transfer tank, the transfer tank
Compounded carbons reserves are fixed.
3. according to regulating device as claimed in claim 2, which is characterized in that the compounded carbons storage tank is provided with Liquid level group
Part, the Liquid level component include liquidometer, dosing metering pump, solenoid valve, and the liquidometer is located at compounded carbons storage tank
Interior, real-time monitoring liquid level, the dosing metering pump water inlet pipe and storage tank outlet connect, the dosing metering pump water inlet pipe
On be provided with solenoid valve, the dosing metering water pump outlet pipe is connect with the inlet tube of the multi-point throwing device, the liquid level control
Component processed is connect with the control system.
4. according to regulating device as claimed in claim 3, which is characterized in that the Liquid level component includes high position sensor, low
The upper inside wall of compounded carbons storage tank is arranged in level sensor, the high position sensor, and low sensors are arranged in composite carbon
The lower inner wall of source storage tank, the high position sensor and the low sensors are provided with prior-warning device.
5. the compounded carbons are soluble carbon source according to regulating device as claimed in claim 3, the solubility carbon source includes Portugal
The carbon source combination of one of grape sugar, molasses, sodium acetate or Multiple components.
6. according to the described in any item regulating devices of claim 1-5, which is characterized in that the dosage Q of the compounded carbonsIt throwsWith dirt
The treating capacity Q of waterWaterMeet following relationship: QIt throws/ per hour=(Y3-Y0)*C/N*QWater/ (COD value) * 24 hours；
Wherein QIt throwsFor the dosage of compounded carbons；
QWaterFor the treating capacity of sewage
Y0For it is described outlet total nitrogen on-line detector measured value,
Y3For the measured value of the import total nitrogen on-line detector；
C/N is fixed value；
COD value is the COD value of additional carbon.
7. according to regulating device as claimed in claim 6, which is characterized in that the compounded carbons are that C/N value is 6.
8. according to regulating device as claimed in claim 7, which is characterized in that the dosage Q of the compounded carbonsIt throwsWith the processing of sewage
Measure QWaterMeet following relationship:
QIt throws=1.2* (4.51Y+3.57X) * QWater/(24*ρ*103),
Wherein, Y=Y2-Y0--- need the nitrate nitrogen concentration removed, mg/L；
The density of ρ compounded carbons；
X --- originate the DO concentration of online dissolved oxygen instrument, mg/L；
Y2It is the nitrate nitrogen value of the nitrate nitrogen detector measurement of the anoxic pond.
9. according to regulating device according to any one of claims 8, which is characterized in that the Y2Amendments in measured value 20 minutes it is primary.
10. according to regulating device according to any one of claims 8, which is characterized in that the dosage Q of the compounded carbonsIt throwsWith the place of sewage
Reason amount QWaterMeet following relationship:
Y2=(24*QIt throws/4.51ρ*QWater-0.79X)+Y0。
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