CN1154615C - Automatic controller for sewage treatment process - Google Patents
Automatic controller for sewage treatment process Download PDFInfo
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- CN1154615C CN1154615C CNB001248979A CN00124897A CN1154615C CN 1154615 C CN1154615 C CN 1154615C CN B001248979 A CNB001248979 A CN B001248979A CN 00124897 A CN00124897 A CN 00124897A CN 1154615 C CN1154615 C CN 1154615C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The present invention discloses an automatic controller for a sewage treatment process, which comprises a sewage treatment tank, a plurality of on-line detection devices, a monitoring system and a plurality of executive elements. According to the automatic controller, the control parameters of the sewage treatment process can be regulated by water drainage quality so as to obtain an optimal treatment effect.
Description
The present invention relates to the automatic control device of sewage treatment process.
Sewage disposal is a requisite important environmental protection project in the urban construction, and is especially even more important to the insufficient city of water resources.Sewage disposal is the sewage of the civilian and/or industrial discharge of different areas in the city to be delivered to through discharge tube sewage works carries out physics and/or chemical treatment gives off water again, sewage works is divided into large, medium and small by its processing power, the small-sized living community that is applicable to, or enterprise, medium-sized and large-scale small and medium-sized cities, the perhaps metropolitan some districts of being applicable to.Based on its processing power, the number of the treatment tank of configuration can be one or more.No matter it all is divided into several different treatment zones but be equipped with several treatment tanks, certain contents processing is born in each zone.Sewage treatment process is a pollution level of measuring sewage by different online detection meanss, with different treatment processs, comprise physics, the chemistry or both methods furthermore, for example, the deposition, absorption, means such as chemical reaction are removed pollutants in sewage matter, reach the sewage of handling and can reclaim the purpose of usefulness again, thereby saved water resources.
Being used for an on-line measuring device part at present is the single proofing unit of detect parameters, but it is again a self-organizing system, the collection measuring element, and therefore umformer, watch-dog, controller, cost an arm and a leg in one, and internal passages link complexity is difficult in maintenance.On the other hand, also some is the automatic control of sewage treatment system that concentrates, but the parameter of the online detection of this system also has only three, four, is difficult to realize the requirement of Comprehensive Control.
Therefore, the object of the invention is to provide a kind of automatic control device of new sewage treatment process.
Automatic control device according to sewage treatment process of the present invention is based on the water quality of the sewage of handling through device as its control criterion.This device comprises:
Have at least one sewage input aperture, the Sewage outlet after at least one is processed, at least one mud discharging mouth and bottom have treatment tank a plurality of aeration heads and that be divided into some treatment zones;
A plurality of on-line measurement devices, wherein at least one is used to detect the water quality by the water of described Sewage outlet discharging;
A supervisory system of forming by PLC control panel and computer, this system receives the detected result of online measuring apparatus to the water quality of sewage and discharge water, wherein:
Detected result to sewage comprises the detected result of direct control sewage treatment process and the detected result that the detected result of direct control sewage treatment process is revised in real time, wherein directly controls the detected result of sewage treatment process and the detected result that the detected result of direct control sewage treatment process is revised is in real time relatively being controlled the work of corresponding topworks in the back with the reference value that presets;
To the water quality detection result of discharge water with the relatively corresponding topworks of back control work of the reference value that presets, and this result is fed back to supervisory system the reference value that presets is dynamically revised;
A plurality of topworkies comprise the sewage front pump, the sewage discharge pump after processed, sludge pump and gas blower that discharging mud/mud refluxes.
According to above-mentioned solution, wherein said treatment tank can be made up of one or more treatment tanks.When using a treatment tank, this pond is divided into a plurality of treatment zones, and for example, the name that the applicant submitted on March 7th, 2000 is called " treatment tank of variable volume ", and application is 00205665.8 disclosed.One or several contents processing is born in each zone; When using a plurality of treatment tank, each treating pond is born one or more contents processings.
Described supervisory system receives the detected result of a plurality of on-line measurement proofing units and the preset reference value of determining according to the water quality standard of discharging after the sewage disposal as previously mentioned, after treatment, by different parameter characteristics, realize respectively: the limit analysis, definite value is arithmetic/logic or process control adjusting relatively, wherein:
Temperature (T) control: temperature controlled purpose is by detecting the actual temperature of sewage, so that relatively determining the detected result relevant with temperature revised in the back with reference value.For example, dissolved oxygen, redox potential.
Acidity (PH) control: the purpose of acidity control is to guarantee in the sewage treatment process that sewage makes processing move under certain acidity under preferable state, for this reason, the acidity of on-line measurement sewage, and the system of input monitoring as a result that will record, in this system, compare with preset reference value, to control the pump work that adds the pump of basic solution in the topworks or add acidic solution, with alkalescence/acidic solution suction treatment tank; Also determine the detected result relevant with acidity revised simultaneously by comparative result, for example, dissolved oxygen, redox potential.
Dissolved oxygen (DO) control: the purpose of dissolved oxygen control is to guarantee in the sewage treatment process that sewage moves under certain oxygen supply conditions, for this reason, the concentration of the dissolved oxygen in the on-line measurement sewage, and measuring result input monitoring system carried out temperature, acidity correction to it, and then in this system, compare with preset reference value, with the operation of the gas blower in the control topworks, the mode of control comprises switch, frequency conversion etc.
Redox potential (ORP) control: the purpose of oxidation reduction potential control is the biological deoxidation dephosphorization of control in the sewage treatment process, for this reason, the current potential of the sewage of the oxidation reduction potential determination of on-line measurement also carries out temperature, acidity correction with measurement result input monitoring system device to it, so with supervisory system in preset reference value relatively back control gas blower and/or reflux pump.
Liquid level control: the purpose of liquid level control is to guarantee in the sewage treatment process to be controlled under certain ratio between the mud contained in sewage and the sewage, for this reason, the liquidometer of on-line measurement is measured the liquid level of sewage and with measurement result input monitoring system, with monitoring device in the relatively operation of back control lift pump of preset reference value.
Sludge concentration (MLSS) control: the purpose of sludge concentration control is to guarantee in time to discharge mud in the sewage treatment process.For this reason, the sludge interface instrumentation amount sludge interface height of on-line measurement, and with measuring result input monitoring device, with monitoring device in relatively back control blowdown dredge pump operation of preset reference value.
Mud refluxes and controls: the purpose of mud backflow control is the detection to discharging water quality after the sewage disposal, so that sewage treatment process is realized real-time adjusting.For this reason, chemical oxygen demand of on-line measurement discharge water (COD) and biological oxygen demand (BOD) (BOD), and with measuring result input monitoring system, with supervisory system in relatively back control blower fan and reflux pump work of preset reference value, to regulate sewage treatment process; On the other hand, with the measurement feedback supervisory system,, make the sewage treatment process optimizing dynamically to regulate the reference value that presets.
Should illustrate that above-mentioned preset reference value regulation and control also can be regulated by keyboard the artificially.
Above-mentioned purpose of the present invention and other purpose and advantage thereof will be more readily apparent from by the detailed description below in conjunction with the accompanying drawing illustrated embodiment, and accompanying drawing has:
Fig. 1 is the structural representation according to the automatic control device of this bright sewage treatment process;
Fig. 2 is the modular configuration diagram of device shown in Figure 1;
Fig. 3-the 5th is according to the logical flow chart of the automatic control device of sewage treatment process of the present invention.
At first, the automatic control device according to sewage treatment process of the present invention is described with reference to Fig. 1.It comprises a treatment tank 1, and this pond comprises 11, one second treatment tanks 12 of one first treatment tank.First treating pond has a sewage input aperture 13, imports first treatment tank 11 and imports second treatment tank 12 by pipeline by the sewage of this input aperture.Second treatment tank 12 have one after processed sewage delivery port 14 and mud discharging mouth 14 ', these two mouths also communicate with first treatment tank 11 by pipeline respectively.
The proofing unit 15 of the sewage temperature T of online detection first treatment tank 11, this device be detected sewage temperature input PLC control panel 2, through and reference value relatively, provide modified value to the detected result of dissolved oxygen, redox potential.
The proofing unit 16 of the sewage acidity PH of online detection first treatment tank 11, this proofing unit is imported PLC control panel 2 with the acidity that detects and is compared with the acidity value that presets.If detected value is lower than preset reference value, PLC control panel 2 sends initiating signal to liquid absorbing pump 23, from acidic solution container 24, extract acidic solution by pipeline 27, four-way junctor 29, pump 30, check valve 31 and magnetic valve 32 and 33 input first treatment tank 11 and second processing vessels 12.If detected value is higher than preset reference value, PLC control panel 2 sends signal to liquid absorbing pump 25, extracts basic solution from basic solution container 26, through pipeline 28, four-way junctor 29, pump 30, check valve 31 and magnetic valve 32 and 33 input first treatment tank 11 and second treatment tanks 12.Should be appreciated that the acidity preset reference value is the interval that is made of high limit and lower bound.The detected result of acidity and reference value also provide the acidity correction factor to the detected result of dissolved oxygen, redox potential after relatively.
The proofing unit 17 of online detection first treatment tank 11 interior dissolution of contaminated water oxygen (DO), the detected result input PLC control panel 2 of this proofing unit, after revising, compare with preset reference value, as be lower than preset reference value, PLC control panel 2 sends signal to gas blower 35, the operation of control gas blower 35 and valve 37,38, operation comprises the frequency conversion of the switch and the gas blower of gas blower and valve.The output of gas blower 35 is imported first treatment tank 11 and second treatment tank 12 respectively through pipeline 39 and valve 37 and 38, uses the needs that the index that makes dissolved oxygen is suitable for sewage treatment process.
The proofing unit 18 of the sewage oxidation reduction potential (ORP) in online detection first treatment tank 11, the detected result input PLC control panel 2 of this proofing unit compares with preset reference value after revising, PLC control panel 2 sends signal to gas blower 35, the operation of control gas blower 35 and valve 37 and 38, operation comprises the frequency conversion of the switch and the gas blower of gas blower and valve, the output of gas blower is through tensimeter 36, pipeline 39 and valve 37,38 import first treatment tank 11 and second treatment tank 12 respectively, use the requirement that the index that makes redox potential meets sewage treatment process.
The liquidometer 19 of on-line measurement second treatment tank 12 liquid levels, liquidometer 19 is imported PLC control panel 2 with detected result and is compared with the preset reference value that is stored in the PLC control panel 2, be lower than preset reference value as the liquid level in second treatment tank 12, send signal to pump 30, make sewage in the preliminary sedimentation tank 4 through valve 40, four-way connection 29, pump 30, the magnetic valve 32 and/or 33 of check valve 31 and first and/or second treatment tank 11 and 12 adds to first treatment tank 11 and/or second treatment tank 12, up to the upper limit that reaches the control liquid level, at this moment PLC control panel 2 sends the signal that stops to extract to preliminary sedimentation tank 4 sewage to pump 30.
Liquid level in the preliminary sedimentation tank 4 is monitored by liquidometer 42 and monitoring result is imported PLC control panel 2 compare with the liquid level that presets, if the liquid level of preliminary sedimentation tank 4 is lower than the preset reference value lower limit, PLC control panel 2 sends to pump 41 and extracts external sewage (not shown) and add to signal in the preliminary sedimentation tank 4.Reached its upper limit when the liquid level of preliminary sedimentation tank 4 detects through liquidometer 42, PLC control panel 2 sends the signal that no longer extracts external sewage to pump 41, and pump 41 is no longer worked, and does not also just have new sewage to add to preliminary sedimentation tank 4.
The proofing unit 20 of the sludge concentration (MLSS) of online detection second treatment tank, this proofing unit are to measure the dirt interface of main aeration zone and detected result is imported PLC control panel 2 with the sludge interface meter to compare with storage preset reference value within it.If the interfacial level that detects reaches the preset reference value upper limit, PLC control panel 2 sends signal to the mud discharging pump 43 and 44 of first treatment tank 11 and second treatment tank 12, make mud by sludge discharging port 14 dischargings, lower limit up to the sludge interface height, PLC control panel 2 no longer discharges the signal of mud to pump 43 and 44, pump 43 and 44 quits work, and mud will no longer discharge.
Discharge from discharge outlet 14 through above-mentioned detection and the sewage handled.The processed sewage of discharging from discharge outlet 14 needs through the mud control that refluxes, and sewage backflow control is that chemical oxygen demand (COD) and the biological oxygen demand (BOD) (BOD) by the on-line measurement sewage effluent realizes.Online COD value that records and BOD value directly feed back to PLC control panel 2 on the one hand, are used to adjust the preset reference value of each test item, so that carry out sewage disposal under new preset reference value; On the other hand detected result and reference value are compared, in case surpass starting fan 35 and sludge reflux pump 43,44.
According to one embodiment of the present of invention, mud discharging pump and sludge reflux pump are same pumps.
Sewage treatment process automatic control device of the present invention also comprises a watch-dog 3 and an input unit 5.Watch-dog 3 shows the detected result of each proofing units and to the operation of each executive device, make managerial personnel can understand the running condition of whole device at any time, and can pass through the preset reference value that input unit 5 (for example, keyboard) be adjusted correlation parameter at any time according to sewage treatment process.
Also it should be noted that, at preliminary sedimentation tank 4, in first treatment tank 11 and second treatment tank 12 limiting plate 47,48 and 49 is arranged respectively, limiting plate is the boundary that is used to define mud and sewage, a plurality of holes are arranged on every block of plate, be convenient in the sewage mud by this also sedimentation, obviously, limiting plate 47,48 and 49 Height Adjustable, and sewage discharge pump 45 and 46 lays respectively on limiting plate 48 and 49.
Fig. 2 shows the module assignment figure according to the supervisory system of the automatic control device of sewage treatment process of the present invention, and in other words, supervisory system of the present invention is to adopt modular construction.Thus, it simplifies the structure, and is convenient to safeguard.Supervisory system comprises eight modules altogether, and wherein first module 201 is used for CPU and power supply, and second module, 202 to the 6th modules 206 are used for the detection and the comparison of each parameter, and these modules are to divide according to the input feature vector of online detection.The 7th module 207 and the 8th module 208 are the execution modules that are used to control executive device.
Fig. 3 is extremely shown in Figure 5 to be the schema of the automatic control device of sewage treatment process of the present invention.As shown in the figure, flow process inserts power supply from step 301 beginning, and each integral part power supply to device enters step 302 then and carries out System self-test, to determine that can each integral part normally move.If break down in the self-check of device, enter step 303, at this moment device sends guard signal, and after fixing a breakdown by the technician, program is returned step 302 and is carried out System self-test again, after self check, confirm not find fault, illustrate that device can enter the commencement of commercial operation state, read in initialize data (reference value) in step 304.The rule of thumb data that initialize data is generally obtained by analysis from the data that detected accumulation in the past.Put into pending sewage in step 305 to treatment tank.As shown in Figure 1, sewage from all respects at first is to enter preliminary sedimentation tank 4, then under the control of PLC control panel 2, by pump 30 with sewage suction treatment tank 11 and 12, a single valve 31 is arranged between pump 30 and treatment tank, its role is to prevent sewage backflow.The liquid level that enters treatment tank 11 and 12 is by liquidometer 19 controls.
After sewage entered treatment tank 11 and 12, each proofing unit detected at step 306 pair sewage.Should be appreciated that, the detected result of each proofing unit of enumerating in Fig. 1 is not that each all is directly used in the control sewage treatment process, for example, temperature detection result, the acidity detected result, Level Detection result, they are just by regulating or perhaps revise which parameter of direct control sewage disposal result (sewage disposal quality) to their detection, specifically, temperature detection result is in that relatively the temperature head that obtains of back is to dissolved oxygen with the reference temperature that presets, and redox potential etc. directly control sewage disposal result's parameter are revised.The acidity detected result is relatively being carried out handled sewage acidity adjustment adding acidity or the basic solution back with reference acidity except that going out, and border difference is to dissolved oxygen factually, and redox potential etc. directly control sewage disposal result's parameter are revised.Level Detection result just controls the sewage quantity of treatment tank, makes it to carry out sewage disposal in predetermined containment.
Get back to Fig. 3 below, further specify detection each test item.
Level Detection at first is described.Level Detection is to determine the highest and minimum liquid level of treatment tank, that is be maximum capacity and the minimum capacity of determining that sewage lagoon is allowed, too much overflow and avoid the very few additional sewage that is unfavorable for that sewage treatment process is untimely again of sewage quantity in the treatment tank with the sewage that prevents to inject treatment tank.Therefore, Level Detection is to determine whether to surpass the highest liquid level or be lower than minimum liquid level.Step 307 is carried out Level Detection, as detecting less than liquid level data, illustrates that there is fault in liquid level detection system, and program turns back to step 302 and carries out self check.If detect liquid level, determine whether to reach top water-level in step 308 and reference value after relatively, if reach, this detection signal is delivered to PLC and is handled panel 2, this panel sends the instruction that sump pump 30 shuts down.When pump 30 quits work, a feedback signal is sent into PLC and handle panel 2, make liquid level detection device continue to detect liquid level (step 309).As not reaching top water-level in step 308 detected result, detection (step 310) by repeatedly is up to relatively determining that having detected liquid level has been lower than lowest water level, when detecting this signal, sends it into PLC control panel 2 in the back in this step with reference value, after the affirmation, it sends working signal to pump 30, therefore, and in 30 startings of step 311 pump, sewage injects treatment tank (step 312), meanwhile, constantly liquid level is detected, form the Level Detection control loop.
Temperature detection is the detection system of an open loop, and its purpose is to determine whether detected actual sewage temperature is higher than/is lower than reference value, to determine that to dissolved oxygen (DO) redox potential (ORP) etc. the directly detected value relevant with sewage disposal are revised.The temperature detection program starts from step 313, if this step does not detect temperature, illustrates that this detection system has fault, and program is returned step 302 pair device and carried out self check again.As detecting sewage temperature in this step, whether compare definite temperature head in step 314 and reference value is zero, if be zero, returning step 313 overline detects, non-vanishing when detecting temperature, though be greater than or less than all entering step 315, to determine since the difference of temperature to dissolved oxygen (DO), the correction factor of redox potential (ORP), and this coefficient is sent to below dissolved oxygen (DO) with explanation, in the handling procedure of redox potential (ORP) their detected result is made correction.
The purpose that acidity detects be by this detection make processed sewage to its carry out acid, alkali is regulated and is tried hard to remain in the desired acidity scope, in the hope of effectively carrying out sewage disposal, by the actual acidity that detects the direct parameter relevant with sewage disposal regulated and revised on the other hand.For this reason, detect sewage acidity in step 316 by acidity proofing unit 16, the result who detects step 317 with put fixed acidity reference value and compare, if result relatively meets predetermined acidity, promptly be in equilibrium state, program turns back to step 316 and continues acidity is detected, if detected result imbalance, it may be acid too high or too low, whether too high, if acidity is too high, this detected result is sent PLC control panel 2 if at this moment entering step 318 detection acidity, and send working signal to pump 25 by it, with the basic solution suction treatment tank (step 320) that is contained in the container 26, in the time of pump 25 startings, also feed back a signal to PLC control panel 2, and proceed acidity through it and detect, that is degree turns back to step 316.Determine that in step 318 acidity is too high, and then ejector priming 25 time, calculate to dissolved oxygen (DO) correction factor of redox potential (ORP) in step 321, and these coefficients are input to the dissolved oxygen of back with explanation, redox potential detects handling procedure.
If determine it is not that acidity is too high in step 318, then enter step 322 and determine whether that acidity is low excessively, if what determine in step 322 is not that acidity is low excessively, there is fault in this explanation acidity detection system, program is returned step 302 and is carried out self check.If determine is that acidity is low excessively, in this case, by PLC control panel 2 ejector primings 23, with the acidic solution suction treatment tank (step 323 and 324) in the container 24, pump 23 sends a feedback signal when starting continues acidity is detected through PLC control panel 2, that is returns step 316.When step 322 determined that acid number is crossed low ejector priming 23, program entered step 325, calculates the correction factor of acidity to dissolved oxygen (DO) and redox potential (ORP), and calculation result is imported the detection handling procedure of dissolved oxygen, redox potential.
It is a crucial test item that dissolved oxygen (DO) detects, and its result is directly related with sewage treatment process.Dissolved oxygen is by being arranged on the dissolved oxygen concentration and the variation thereof of sewage in the dissolved oxygen analytic instrument cell in the treatment tank.Sewage treatment process is actually the biological oxidation-reduction process, and how much what contain soluble oxygen in the sewage will directly influence the speed whether biological oxidation-reduction can continue and carry out.In view of the above, program at first detects in step 326, as not examining dissolved oxygen content in this step, show that there is fault in proofing unit, program is returned step 302 self check, after detecting content, enter step 327 pair detected result and revise, revise since the variation of temperature, acidity to the influence of dissolved oxygen detected result.Revised data compare in step 328 and reference value.If the result relatively is lower than preset reference value, step enters step 329 and starts gas blower 35, and air is sent into treatment tank to increase the amount of oxygen in the sewage, impels biological oxidation-reduction.To send a feedback signal when step 329 starts gas blower 35, program is returned step 326 and is continued dissolved oxygen (DO) is detected.If the result who detects in step 328 also is not less than preset reference value, then further detect whether be higher than preset reference value,, then close blower fan 35 in step 331 if be higher than preset reference value in step 330, stop the treatment tank air feed is returned step to 326 simultaneously.If detected result is not higher than preset reference value yet, illustrate that this detection system has fault, program is returned step 302 self check.
The following describes the detection that another concerns the important parameter redox potential (ORP) of sewage disposal.The detection of redox potential (ORP) starts from step 332, if do not detect redox potential in this step then return to step 302 self check again.If detect redox potential in this step, carry out correction due to the difference between temperature, acidity and corresponding reference value in step 333 pair detected result, revised result compares in step 334 and reference value, if the result relatively is that redox potential is low excessively, show the interior anoxic of treatment tank at this moment, and return sludge ratio is low excessively, therefore, starts gas blower 35 and sludge reflux pump 43,44 respectively in step 335 and 336.When starting blower fan and reflux pump, feed back a signal and proceed redox potential (ORP) detection to PLC control panel 2.If the redox potential after comparison is not a process, whether the redox potential after then further detecting relatively is too high, if it is too high, show that the phosphor-removing effect in the sewage treatment process reduces, and reflux ratio is excessive, control blower fan 35 respectively in step 338 and 339 this moment and reduce air output and control reflux pump 43,44 attenuating reflux ratios, even close blower fan 35 and/or reflux pump 43,44.When reducing running speed or close, blower fan and/or reflux pump send a signal to proceed the detection of redox potential (ORP) to PLC control panel 2.If can not detect too highly in step 337, then should turn back to step 302.
Another project that sewage treatment process is detected is the detection to sludge concentration (MLSS), and as previously mentioned, this detection is to realize by the sludge interface height that detects main aeration zone.Therefore, at first sludge concentration (MLSS) is detected,, then return step 302 pair device and carry out self check if can not detect in this step in step 340.If the sludge concentration of detecting, promptly detect the sludge interface of main aeration zone, program enters step 341 and compares with reference value, if the result has relatively surpassed the sludge interface that allows, enter the mud discharging pump 43,44 that step 342 starts discharging mud, with mud discharging.When starting sludge pump, send feedback signal and continue sludge concentration is entered detection, that is return step 340 to PLC control panel 2.Also return step 340 continuation detection sludge concentration if surpass the sludge interface that allows in step 341 detected result.
As previously mentioned, the automatic control device of sewage treatment process of the present invention is by quality of sewage disposal is controlled in the online detection of water quality of treated sewage of discharging.Therefore, on schema, also comprise testing process, i.e. the control flow that mud is refluxed to discharge water.Detect the mud backflow and comprise that chemical oxygen demand (COD) detects and biological oxygen demand (BOD) (BOD) detects two aspects.Below their testing process will be described respectively.
The testing process of chemical oxygen demand (COD) at first, is described.The chemical oxygen demand testing process starts from step 343, if do not detect chemical oxygen demand in this step then turn back to step 302 self check again.If detect chemical oxygen demand (COD) in step 343, on the one hand detected result being fed back to the step 304 pair reference value that presets revises, to realize controlling the entire sewage treating processes by the water quality of drainage water, compare in step 344 and reference value on the other hand, as result relatively is that measured value does not surpass reference value, chemical oxygen demand is described above putting definite value, program is returned step 343 overline and is detected.If measured value surpasses reference value, then start blower fan 35 and sludge reflux pump 43,44 respectively in step 345 and 346.It should be noted that mud discharging pump and sludge reflux pump are same pump, turning direction difference when only being to use.Any all can feed back a signal to PLC control panel 2 to start blower fans or sludge reflux pump 43,44 in step 345 or 346, and continuation detects chemical oxygen demand, that is returns step 343.
Another test item that detects discharge water water quality is that biological oxygen demand (BOD) (BOD) detects, and it starts from step 347, and as not detecting biological oxygen demand (BOD) in this step, program turns back to the self check of step 302 overline.If detect biological oxygen demand (BOD) in this step, on the one hand measurement feedback is arrived step 304, thus, opposed fixed reference value is adjusted, realization is controlled sewage treatment process with the water quality of drainage water, compare in step 348 and reference value on the other hand, if measured value is lower than reference value, program is returned step 347 and is detected again.Surpass reference value in case detect biological oxygen demand (BOD) (BOD), reflux, undertaken by desired technological process to promote sewage disposal at step 349 and 350 starting fans 35 and sludge pump 43 and the 44 pairs of sludge treatment pond oxygenations and mud.At blower fan 35, send a feedback signal in the time of sludge pump 43 and 44 startings, this signal continues the pollution substance biological oxygen demand (BOD) is detected through PLC control panel 2.
Overcome in the prior art fewly to the sewage treatment process test item according to the automatic control device of sewage treatment process of the present invention, equipment disperses, the shortcoming of matching capacity difference.Realized than the more test item of prior art, and be in same device, can organically coordinate to carry out under the division of labor, according to design of the present invention and embodiment, be understood that, the practical situation that the user can look sewage increase and decrease voluntarily to test item, perhaps certain or certain several test items can be adjusted or change.The present invention can adjust the fixed reference value of putting of each test item in real time according to the water quality detection of drainage water, to guarantee that sewage treatment process can move under the state of the best.
The applicant has done detailed explanation with regard to design of the present invention and embodiment; can make various conversion and improvement on this basis for the professional and technical personnel; but these conversion and improvement all do not exceed spirit of the present invention, all in the protection domain that claims limit.
Claims (4)
1. the automatic control system of sewage treatment process is characterized in that comprising:
Have at least one sewage input aperture, the Sewage outlet after at least one is processed, at least one mud discharging mouth and bottom have treatment tank a plurality of aeration heads and that be divided into some treatment zones;
A plurality of on-line measurement devices, wherein at least one is used to detect the water quality by the water of described Sewage outlet discharging;
A supervisory system of forming by PLC control panel and computer, this system receives the detected result of online measuring apparatus to the water quality of sewage and discharge water, wherein:
Detected result to sewage comprises the detected result of direct control sewage treatment process and the detected result that the detected result of direct control sewage treatment process is revised in real time, wherein directly controls the detected result of sewage treatment process and the detected result that the detected result of direct control sewage treatment process is revised is in real time relatively being controlled the work of corresponding topworks in the back with the reference value that presets;
To the detected result of the water quality of discharge water with the relatively corresponding topworks of back control work of the reference value that presets, and this result is fed back to supervisory system the reference value that presets is dynamically revised;
A plurality of topworkies comprise the sewage front pump, the sewage discharge pump after processed, sludge pump and gas blower that discharging mud/mud refluxes.
2. according to the described automatic control device of claim 1, it is characterized in that described on-line measurement device comprises the temperature-detecting device that places in the sewage lagoon, the acidity proofing unit, liquid level detection device, the dissolved oxygen proofing unit, redox potential proofing unit, the mud backflow proofing unit of the water quality of sludge concentration proofing unit and detection discharge water, described mud backflow proofing unit comprises pollution substance chemical oxygen demand proofing unit and pollution substance biological oxygen demand (BOD) proofing unit, wherein:
Directly the detected result of control sewage treatment process comprises following Device Testing result, dissolved oxygen proofing unit, redox proofing unit and sludge concentration proofing unit;
The detected result that the detected result of direct control sewage treatment process is revised in real time comprises following Device Testing result, temperature-detecting device, acidity proofing unit and liquid level detection device.
3. according to the described automatic control device of claim 2, it is characterized in that:
Described temperature-detecting device is providing temperature correction coefficient with detected sewage temperature with the relatively back detected value to dissolved oxygen, redox potential of the reference value that presets;
Described acidity proofing unit with detected sewage acidity with the reference value that presets relatively the back determined acidity cross low or the corresponding pump of the too high starting of acidity with acidic solution or basic solution suction treatment tank, to keep suitable acidity; Detected sewage acidity is also providing the acidity correction factor to the detected value of dissolved oxygen, redox potential with the reference value that presets after relatively;
Described liquid level detection device is being crossed detected sewage level low or too high starting or is being closed and will be stored in the pump of the sewage suction treatment tank in the preliminary sedimentation tank with the relatively back determined liquid level of predetermined reference value;
Described dissolved oxygen proofing unit is being lower than detected dissolution of contaminated water oxygen detected value preset reference value or is higher than the startup of preset reference value or closes gas blower with the reference value that presets is more determined after temperature, the correction of acidity correction factor;
Described redox potential proofing unit with the detected value of detected sewage oxidation reduction potential after temperature, the correction of acidity correction factor with more determined hypopotenia of the reference value that presets or too high startup or close blower fan and sludge reflux pump;
The detected value of the sludge concentration of the sewage that described sludge concentration proofing unit detects is the mud in the startup mud discharging pump sewage effluent pond when relatively the determined mud height in back surpasses referential data with the reference value that presets;
The chemical oxygen demand of the detected discharge water of described chemical oxygen demand proofing unit feeds back to supervisory system the reference value that presets is revised, simultaneously starting gas blower and sludge reflux pump when relatively the determined chemical oxygen demand in back surpasses reference value with the reference value that presets;
The biological oxygen demand (BOD) of the detected discharge water of described biological oxygen demand (BOD) proofing unit feeds back to supervisory system reference value is revised, simultaneously starting gas blower and sludge reflux pump when relatively the determined biological oxygen demand (BOD) in back surpasses reference value with the reference value that presets.
4. according to the described automatic control device of claim 3, it is characterized in that described mud discharging pump and sludge reflux pump are same pumps.
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