CN113292200A - Online multi-parameter automatic rapid water quality detection device in sewage treatment process - Google Patents
Online multi-parameter automatic rapid water quality detection device in sewage treatment process Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Water biological or chemical oxygen demand (BOD or COD)
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/14—NH3-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
- C02F2209/15—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
- C02F2209/42—Liquid level
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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
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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
- C02F3/006—Regulation methods for biological treatment
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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
- C02F3/28—Anaerobic digestion processes
Abstract
The invention discloses an online multi-parameter automatic rapid water quality detection device in a sewage treatment process, which comprises a biological tank, wherein a slurry-water mixed liquid in the tail end of the biological tank is communicated with a sewage inlet pipe, the sewage inlet pipe is communicated with a sedimentation barrel water pump, and the sedimentation barrel water pump is communicated with a sedimentation barrel through a water inlet electromagnetic valve; the upper end surface of the sedimentation barrel is provided with a mud level determinator, a liquid level limiter and a flushing electromagnetic valve; a detection liquid inlet sampling height H3 which is arranged below the upper surface of the sedimentation barrel is communicated with the upper end surface of the detection liquid barrel through a detection liquid inlet electromagnetic valve; the detection liquid barrel is provided with a nitrate nitrogen tester and is communicated with the ammonia nitrogen tester, the total phosphorus tester and the COD tester; the nitrate nitrogen tester, the ammonia nitrogen tester, the total phosphorus tester and the COD tester are respectively and electrically connected with the PLC and the data acquisition instrument; the data acquisition instrument is in communication connection with a data display in the dispatching room. The intelligent degree is high, the detection function is multiple, the detection data is accurate, and the operation reliability is strong.
Description
Technical Field
The invention relates to a sewage treatment device, in particular to an online multi-parameter automatic rapid water quality detection device in a sewage treatment process.
Background
At present, with the increasing of the population of China, the continuous expansion of cities and the rapid development of industrialization, daily domestic, industrial and agricultural sewage is more and more generated, and the monitoring and treatment of sewage are more and more concerned by people:
the Chinese patent with the application number of 201220705098.7 specifically comprises the following contents: the utility model provides a sewage detection device, including the drain pipe, still include flow gate and sewage detector, sewage detector installs in the delivery port department of drain pipe, and flow gate installs on the drain pipe, the inside filter screen that still is equipped with of drain pipe, sewage detector and flow gate all are connected with a computer. The utility model discloses can be when detecting sewage, through the transmission of signal of telecommunication for relevant department in time masters sewage discharge's information, can also in time stop the emission of sewage, reduced environmental pollution. This sewage monitoring device function is comparatively single, and intelligent degree is not high, can not satisfy the needs of development.
The Chinese patent with the application number of 201320397253.8 specifically comprises the following contents: the utility model provides a hospital sewage detection alarm device relates to sewage treatment technical field, including all kinds of detectors, data line, industrial computer, all kinds of detectors link to each other with the industrial computer through the data line, and the industrial computer includes comparator and alarm again, and after the data entering industrial computer of all kinds of detectors, compare with the corresponding numerical value of the interior storage of comparator of industrial computer, if the numerical value of certain detector input surpassed normal range, then the signal that the comparator output started gives the alarm, then starts with the alarm that the detector corresponds, realizes reporting to the police. The utility model discloses utilize the powerful data processing ability of industrial computer, directly select unqualified test item, then send the alarm that corresponds again, realize reporting to the police, whole operation process only needs a staff to place the sewage water sample on the detector, can realize the detection and the warning of sewage water sample, easy operation, improved work efficiency greatly. The sewage detection alarm device detects and alarms afterwards, so that the sewage treatment work is passive.
The Chinese patent with the application number of 201420726315.X comprises the following specific contents: the utility model provides a novel urban domestic sewage on-line monitoring device which characterized in that: comprises a detection chamber, an intelligent control panel and a single water pollution detector; a plurality of detection chambers are connected with the water storage tank and separated by an intelligent control switch I; the other side of the detection chamber is provided with a second intelligent control switch; the single water pollution detector is arranged in the detection chamber; the single-item water pollution detector is provided with a wireless signal output device; one side of the water storage tank is connected with the water inlet pipe; a water inlet check valve is arranged at the pipe orifice of the water inlet pipe; the water storage tank is positioned at the upper part of the tank body; a water outlet pipe is arranged at the lower part of the box body; and a water outlet one-way valve is arranged at the pipe orifice of the water outlet pipe. The utility model discloses convenient operation can regularly monitor the multiple water pollution condition, the understanding water pollution situation of change that makes the user can be better, can effectual raise the efficiency. The monitoring device is simple in structure, and does not perform sufficient and appropriate pretreatment on the collected sewage water sample, so that the detection result is inaccurate.
The uncertainty of harmful components and contents of sewage is caused by the difference of sewage sources such as large discharge of industrial waste water, agricultural non-point source pollution, use of chemical fertilizers, domestic pollution of residents, treatment of domestic sewage and domestic solid waste and the like; the sewage of the existing sewage treatment plant is discharged from a water outlet pasteurization measuring tank after being filtered by a grid channel, homogenized by an adjusting tank, treated by a biological tank of a sewage treatment system, treated by a secondary sedimentation tank, a denitrification filter tank, a high-efficiency clarification tank, filtered at high speed and treated by a disinfection tank; the influent water quality is detected at the water inlet of the biological tank, the high and low conditions of pollution factors such as COD (chemical oxygen demand), PH value, ammonia nitrogen, total phosphorus, total nitrogen and the like are mainly detected, and influent water quality data support is provided for adding medicaments at the water inlet of the denitrification filter tank and the water inlet of the high-efficiency clarification tank; the dosing is a very important link in the sewage treatment process, whether the dosing amount is reasonable or not is a key for determining the quality of the treated water, and the dosing amounts required by different water qualities are different; the effluent quality detection is generally performed at a Babbitt measuring tank at the tail end of a sewage treatment system; the effluent quality detection is mainly used for representing the degree of water quality purification and comparing whether the effluent quality reaches the discharge standard. In the existing process of sewage treatment, the sewage components treated in the biological tank are changed, and the medicine is added according to the detection data of the water inlet of the biological tank, so that the risk of substandard effluent caused by inaccurate medicine adding type and dosage exists, and when the effluent is detected to be substandard, the treated sewage is discharged out of a factory for more than 40 minutes and even has a longer time. In order to ensure that the treated sewage reaches the standard, many engineers use measures of increasing the adding amount of chemical agents such as carbon sources and phosphorus removal agents and increasing the oxygen supply amount of a biological tank through the water inlet of the denitrification filter tank and the water inlet of the high-efficiency clarification tank to achieve the purpose of discharging the effluent after reaching the standard, so that more agents and electric power are consumed, and the operating cost of sewage treatment is increased. Therefore, the existing water quality detection method cannot detect the water quality parameters such as COD, PH value, ammonia nitrogen, total phosphorus, total nitrogen and the like in the sewage treatment process on line in advance in real time, cannot study and judge the water quality condition in advance, cannot schedule the throwing variety and dosage of the advanced treatment agent in advance, and cannot adjust the aeration amount of the biological tank in time. With the further improvement of the environmental protection requirement, the discharge standard of a sewage treatment plant is also continuously improved, in order to ensure the stable standard discharge and the quality improvement and efficiency improvement of sewage treatment, the online multi-parameter water quality in the sewage treatment process needs to be rapidly detected, and data support is provided for the water inlet of a denitrification filter pool and the water inlet of a high-efficiency clarification pool according to the accurate pesticide application scheduling and regulation of data, so that new requirements are provided for the water quality detection in the middle process of sewage treatment, and no document report of an online multi-parameter water quality automatic rapid detection device in the sewage treatment process is found through retrieval.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an online multi-parameter automatic rapid water quality detection device in the sewage treatment process.
The technical scheme of the invention is as follows:
the online multi-parameter automatic rapid water quality detection device in the sewage treatment process comprises a biological tank and sludge-water mixed liquid being treated in the biological tank, wherein the sludge-water mixed liquid at the tail end of the biological tank is communicated with a sewage inlet pipe, the sewage inlet pipe is communicated with a sedimentation barrel water pump, and the sedimentation barrel water pump is communicated with a sedimentation barrel through a sedimentation barrel water inlet electromagnetic valve; the depth of sewage in the sedimentation barrel is H1, the upper end surface of the sedimentation barrel is provided with a mud level tester, a liquid level limit gauge and a flushing electromagnetic valve, the flushing electromagnetic valve is communicated with a tap water pipe, and the side edge of the upper end of the sedimentation barrel is provided with a sedimentation overflow pipe and is communicated with an emptying pipe; the bottom surface of the sedimentation barrel is communicated with the emptying pipe through a sedimentation barrel drainage electromagnetic valve, the sludge height at the lower part of the sedimentation barrel is H2, and the position which is far away from the detection liquid inlet sampling height H3 below the upper surface of the sedimentation barrel is communicated with the upper end surface of the detection liquid barrel through a detection liquid inlet electromagnetic valve; a detection overflow pipe is arranged on the side edge of the upper end of the detection liquid barrel and is communicated with the emptying pipe; the lower end surface of the detection liquid barrel is communicated with the emptying pipe through a detection barrel liquid discharge electromagnetic valve; the detection liquid barrel is provided with a nitrate nitrogen determinator and is communicated with the ammonia nitrogen determinator, the total phosphorus determinator and the COD determinator; the nitrate nitrogen tester, the ammonia nitrogen tester, the total phosphorus tester and the COD tester are respectively and electrically connected with the PLC and the data acquisition instrument; the PLC is respectively and electrically connected with the mud level determinator, the liquid level limiter, the flushing solenoid valve, the sedimentation barrel water inlet solenoid valve, the sedimentation barrel water discharge solenoid valve, the detection barrel water inlet solenoid valve, the detection barrel water discharge solenoid valve and the sedimentation barrel water pump, and the PLC and the sedimentation barrel water pump are respectively and electrically connected with the power supply; the data acquisition instrument is in communication connection with a data display in the dispatching room; the emptying pipe is communicated with the biological pond.
The sedimentation barrel water pump comprises a centrifugal pump or a gear pump or a diaphragm pump or a peristaltic pump.
The sludge height H2 is less than or equal to the sampling height H3 plus 70mm of the detection feed liquor.
The volume of the part above the detection liquid sampling height H3 of the sedimentation barrel is matched with the volume of the detection liquid barrel.
The nitrate nitrogen determinator comprises an electrode determinator or a fluorescence determinator.
The ammonia nitrogen tester comprises a chemical reagent detection method ammonia nitrogen tester.
The total phosphorus determinator comprises a chemical reagent detection method total phosphorus determinator.
The COD tester comprises a potassium dichromate method COD rapid tester.
The invention has the beneficial effects that:
the on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process organically combines the arranged sedimentation barrel and the detection liquid barrel with a sedimentation barrel water pump, a plurality of water quality detectors, a plurality of control electromagnetic valves, a mud level determinator, a liquid level limit meter and a communication pipeline through a PLC (programmable logic controller), combines the PLC automatic control technology and the modern sewage detection technology with the traditional design, enables each technical characteristic of the combination to be systematized and cooperated with each other, is reasonably distributed in space, is comprehensively controlled in operation time and functionally supported with each other, has more superior technical effect than the sum of the effects of each technical characteristic, realizes the upgrading and updating of the on-line multi-parameter water quality detection technology in the sewage treatment process, optimizes the water quality detection mode of a traditional sewage treatment terminal, and realizes the on-line multi-parameter automatic rapid water quality detection implemented at the tail end of a biological tank of the sewage treatment system in the front process of a secondary sedimentation tank of the sewage treatment system compared with the existing two-stage automatic rapid water quality detection device The mode of tail end water quality detection of a treatment system or a three-stage treatment system finishes real-time automatic and rapid detection of water quality parameters such as COD, ammonia nitrogen, nitrate nitrogen, total phosphorus and the like at the tail end of a biological tank in the sewage treatment process within five to seven hours in advance, achieves prepositive detection of the water quality parameters, leads the purification data of the water quality to be detected and judged within several hours in advance, provides powerful data support for implementing accurate pesticide application, carbon source and phosphorus removal agent feeding and accurate aeration of the biological tank per se at the water inlet of a denitrification filter tank and the water inlet of a high-efficiency clarification tank according to the detection data, reduces the consumption of medicaments and electric power, and reduces the operation cost of sewage treatment; the online detection records show that the intelligent degree is high, the detection functions are multiple, the detection data are accurate, the operation reliability is high, the requirement of sewage treatment development can be met, and the market application prospect is wide.
The setting precipitation bucket can effectively realize the precipitation separation of activated sludge and water in the mixed liquid, makes the water sample that is surveyed reach the detection conditions of nitrate nitrogen apparatus, ammonia nitrogen apparatus, total phosphorus apparatus, COD apparatus, has improved the accuracy nature and the validity that detect.
The sludge height H2 is less than or equal to the sampling height H3 plus 70mm of the detection liquid, and the optimized data which are obtained through repeated tests and ensure that the cleanliness of the detection liquid meets the detection conditions on the premise of ensuring the rapidness are ensured.
The design that the volume of the part above the detection liquid inlet sampling height H3 of the sedimentation barrel is selected to be matched with the volume of the detection liquid barrel effectively shortens the time for filling the detection liquid barrel with the clarified sewage.
The nitrate nitrogen measuring instrument is an electrode measuring instrument or a fluorescence measuring instrument. The probe of the on-line nitrate nitrogen analyzer is directly immersed for measurement without sampling and pretreatment; no chemical reagent is needed, and no secondary pollution is caused; the response time is short, and continuous measurement can be realized; the sensor has an automatic cleaning function, and the maintenance amount can be reduced.
The ammonia nitrogen determinator selects a chemical reagent detection method. The ammonia nitrogen tester adopts a salicylic acid method or a Nashin reagent method to test the ammonia nitrogen concentration, and NH4+ reacts with related chemical reagents to develop color under the action of a catalyst. The color change is proportional to the concentration of NH4+ in the sample, within the measuring range of the ammonia nitrogen determinator. Therefore, the ammonia nitrogen determinator calculates the concentration of NH4+ in the sample by measuring the degree of color change, thereby realizing the determination of ammonia nitrogen.
The total phosphorus determinator selects a chemical reagent detection method. A total phosphorus tester by a chemical reagent detection method comprises the steps of hydrolyzing polyphosphate and a phosphorus-containing compound under high-temperature and high-pressure acidic conditions to generate orthophosphate radicals, and further oxidizing other stable phosphorus-containing compounds into the orthophosphate radicals by sodium persulfate. In the strong acid solution containing molybdate, the generated antimony compound is reduced into blue phosphomolybdate by ascorbic acid. And measuring the absorbance of the phosphomolybdate by using a total phosphorus determinator, thereby completing the determination of the total phosphorus in the sample.
The COD tester selects a potassium dichromate method COD rapid tester. The principle of COD determination by the potassium dichromate method is as follows: the mixed solution of a water sample, potassium dichromate, a silver sulfate solution (a catalyst can fully oxidize linear aromatic hydrocarbon compounds) and concentrated sulfuric acid is heated to 175 ℃ in a digestion pool, chromium ions are reduced from VI valence to III valence as an oxidizing agent to change color, the color change degree corresponds to the content of organic compounds in the sample, and the COD of the sample is directly displayed by an instrument through colorimetric conversion. The main interferent when the COD quick detector of the waste water is used for detecting the COD of the waste water is chloride, and mercury sulfate can be added to form a complex for removal. The combination of the classic potassium dichromate oxidation method and a brand-new testing technology enables the COD rapid detector by the potassium dichromate method to automatically calculate the COD value when carrying out the COD detection of the wastewater. Digestion and measurement integrated design, so that COD determination is more simplified and rapid.
Drawings
FIG. 1 is a schematic structural diagram of an on-line multi-parameter automatic rapid water quality detection device in a sewage treatment process.
FIG. 2 is a schematic view of the installation position of an on-line multi-parameter automatic rapid water quality detection device in a sewage treatment process in a sewage treatment flow diagram.
FIG. 3 is a schematic view of a sewage treatment process of the prior art.
In the figure: 1-precipitation barrel, 2-mud level determinator, 3-liquid level limit meter, 4-precipitation overflow pipe, 5-precipitation drainage electromagnetic valve, 6-emptying pipe, 7-precipitation barrel water pump, 8-precipitation water inlet electromagnetic valve, 9-detection liquid discharge electromagnetic valve, 10-detection liquid barrel, 11-nitrate nitrogen determinator, 12-detection liquid inlet electromagnetic valve, 13-flushing electromagnetic valve, 14-PLC controller, 15-data acquirer, 16-ammonia nitrogen determinator, 17-total phosphorus determinator, 18-COD determinator, 19-detection overflow pipe, 20-biological tank, 21-muddy water mixed liquid, 22-tap water pipe, 23-scheduling chamber, 24-data displayer, 25-sewage water inlet pipe, H1-sewage depth, H2-sludge height, H3-detection feed liquor sampling height.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-3: the online multi-parameter automatic rapid water quality detection device in the sewage treatment process comprises a biological pool 20 and a sludge-water mixed liquid 21 being treated in the biological pool, wherein the sludge-water mixed liquid 21 at the tail end of the biological pool is communicated with a water inlet pipe 25, the water inlet pipe 25 is communicated with a sedimentation barrel water pump 7, and the sedimentation barrel water pump 7 is communicated with a sedimentation barrel 1 through a sedimentation barrel water inlet electromagnetic valve 8; the arranged sedimentation barrel can effectively settle activated sludge and bubbles in the mud-water mixed liquid, so that the detected water sample reaches the detection conditions of the nitrate nitrogen determinator, the ammonia nitrogen determinator, the total phosphorus determinator and the COD determinator, and the detection accuracy and effectiveness are improved; the depth of a mud-water mixed liquid sample in the sedimentation barrel 1 is H1, the upper end surface of the sedimentation barrel 1 is provided with a mud level tester 2, a liquid level limit gauge 3 and a flushing electromagnetic valve 13, the flushing electromagnetic valve 13 is communicated with a tap water pipe 22, and the side edge of the upper end of the sedimentation barrel 1 is provided with a sedimentation overflow pipe 4 and is communicated with an emptying pipe 6; the bottom surface of the sedimentation barrel 1 is communicated with an emptying pipe 6 through a sedimentation barrel drainage electromagnetic valve 5, the sludge height at the lower part of the sedimentation barrel 1 is H2, and the position which is far away from the detection liquid inlet sampling height H3 below the upper surface of the sedimentation barrel 1 is communicated with the upper end surface of a detection liquid barrel 10 through a detection liquid barrel liquid inlet electromagnetic valve 12; a detection liquid overflow pipe 19 is arranged on the side edge of the upper end of the detection liquid barrel 10 and communicated with the emptying pipe 6; the lower end face of the detection liquid barrel 10 is communicated with the emptying pipe 6 through a detection liquid drainage electromagnetic valve 9; the detection liquid barrel 10 is provided with a nitrate nitrogen tester 11 and is communicated with an ammonia nitrogen tester 16, a total phosphorus tester 17 and a COD tester 18; the nitrate nitrogen tester 11, the ammonia nitrogen tester 16, the total phosphorus tester 17 and the COD tester 18 are respectively and electrically connected with the PLC controller 14 and the data acquisition instrument 15; the PLC 14 is respectively and electrically connected with the mud level determinator 2, the liquid level limiter 3, the flushing electromagnetic valve 13, the sedimentation barrel water inlet electromagnetic valve 8, the sedimentation barrel water discharge electromagnetic valve 5, the detection barrel water inlet electromagnetic valve 12, the detection barrel water discharge electromagnetic valve 9 and the sedimentation barrel water pump 7, and the PLC 14 and the sedimentation barrel water pump 7 are respectively and electrically connected with a power supply; the data acquisition instrument 15 is electrically connected with a data display 24 in the dispatching room 23; the emptying pipe 6 is communicated with the biological pond 20. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process organically combines the arranged sedimentation barrel and the detection liquid barrel with a sedimentation barrel water pump, a plurality of water quality detectors, a plurality of control electromagnetic valves, a mud level determinator, a liquid level limit meter and a communication pipeline through a PLC (programmable logic controller), combines the PLC automatic control technology and the modern sewage detection technology with the traditional design, enables each technical characteristic of the combination to be systematized and cooperated with each other, is reasonably distributed in space, is comprehensively controlled in operation time and functionally supported with each other, has more superior technical effect than the sum of the effects of each technical characteristic, realizes the upgrading and updating of the on-line multi-parameter water quality detection technology in the sewage treatment process, optimizes the water quality detection mode of a traditional sewage treatment terminal, and realizes the on-line multi-parameter automatic rapid water quality detection implemented at the tail end of a biological tank of the sewage treatment system in the front process of a secondary sedimentation tank of the sewage treatment system compared with the existing two-stage automatic rapid water quality detection device The mode of tail end water quality detection of a treatment system or a three-stage treatment system finishes real-time automatic and rapid detection of water quality parameters such as COD, ammonia nitrogen, nitrate nitrogen, total phosphorus and the like at the tail end of a biological tank in the sewage treatment process within five to seven hours in advance, achieves prepositive detection of the water quality parameters, leads the purification data of the water quality to be detected and judged within several hours in advance, provides powerful data support for implementing accurate pesticide application, carbon source and phosphorus removal agent feeding and accurate aeration of the biological tank per se at the water inlet of a denitrification filter tank and the water inlet of a high-efficiency clarification tank according to the detection data, reduces the consumption of medicaments and electric power, and reduces the operation cost of sewage treatment; the online detection records show that the intelligent degree is high, the detection functions are multiple, the detection data are accurate, the operation reliability is high, the requirement of sewage treatment development can be met, and the market application prospect is wide.
The sedimentation barrel water pump 7 comprises a centrifugal pump or a gear pump or a diaphragm pump or a peristaltic pump.
The sludge height H2 is less than or equal to the sampling height H3 plus 70mm of the detection feed liquor. On the premise of ensuring the rapidness, the clarity of the detection liquid is ensured to meet the optimized data of the detection conditions.
The volume of the part above the detection liquid sampling height H3 of the sedimentation barrel 1 is matched with the volume of the detection liquid barrel 10. Effectively shortening the time for filling the detection liquid barrel with the clarified sewage.
The nitrate nitrogen analyzer 11 comprises an electrode analyzer or a fluorescence analyzer on-line nitrate nitrogen analyzer. The probe of the on-line nitrate nitrogen analyzer is directly immersed for measurement without sampling and pretreatment; no chemical reagent is needed, and no secondary pollution is caused; the response time is short, and continuous measurement can be realized; the sensor has an automatic cleaning function, and the maintenance amount can be reduced.
The ammonia nitrogen determinator 16 comprises an ammonia nitrogen determinator by a chemical reagent detection method. The ammonia nitrogen tester adopts a salicylic acid method or a Nashin reagent method to test the ammonia nitrogen concentration, and NH4+ reacts with related chemical reagents to develop color under the action of a catalyst. The color change is proportional to the concentration of NH4+ in the sample, within the measuring range of the ammonia nitrogen determinator. Therefore, the ammonia nitrogen determinator calculates the concentration of NH4+ in the sample by measuring the degree of color change, thereby realizing the determination of ammonia nitrogen.
The total phosphorus determinator 17 comprises a chemical reagent detection method total phosphorus determinator. A total phosphorus tester by a chemical reagent detection method comprises the steps of hydrolyzing polyphosphate and a phosphorus-containing compound under high-temperature and high-pressure acidic conditions to generate orthophosphate radicals, and further oxidizing other stable phosphorus-containing compounds into the orthophosphate radicals by sodium persulfate. In the strong acid solution containing molybdate, the generated antimony compound is reduced into blue phosphomolybdate by ascorbic acid. And measuring the absorbance of the phosphomolybdate by using a total phosphorus determinator, thereby completing the determination of the total phosphorus in the sample.
The COD determinator 18 comprises a potassium dichromate method COD rapid determinator. The principle of COD determination by the potassium dichromate method is as follows: the mixed solution of a water sample, potassium dichromate, a silver sulfate solution (a catalyst can fully oxidize linear aromatic hydrocarbon compounds) and concentrated sulfuric acid is heated to 175 ℃ in a digestion pool, chromium ions are reduced from VI valence to III valence as an oxidizing agent to change color, the color change degree corresponds to the content of organic compounds in the sample, and the COD of the sample is directly displayed by an instrument through colorimetric conversion. The main interferent when the COD quick detector of the waste water is used for detecting the COD of the waste water is chloride, and mercury sulfate can be added to form a complex for removal. The combination of the classic potassium dichromate oxidation method and a brand-new testing technology enables the COD rapid detector by the potassium dichromate method to automatically calculate the COD value when carrying out the COD detection of the wastewater. Digestion and measurement integrated design, so that COD determination is more simplified and rapid.
The following table extracts part of the online detection records of sewage treatment:
the online detection record of sewage treatment shows that the intelligent degree is high, the operation reliability is strong, and the requirement of sewage treatment development can be met.
The use method of the online multi-parameter automatic rapid water quality detection device in the sewage treatment process comprises the following steps: the method comprises the following steps:
step 1, powering on and starting up: the PLC 14 and the sedimentation barrel water pump 7 are respectively electrified with a power supply to start up;
step 4, settling time: when the liquid level reaches the sewage depth H1 set by the liquid level limit meter 3, the PLC 14 starts to time for 30-35 minutes;
step 5, mud measurement and sampling: after 30-35 minutes, the PLC 14 controls the mud level measuring instrument 2 to start measuring the height H2 of the mud level and reads the height H2 of the mud level measured by the mud level measuring instrument 2; then the data acquisition analyzer in the PLC 14 starts to compare whether H2 is less than or equal to H3+70mm, if H2 is less than or equal to H3+70mm, the electromagnetic sampling valve 12 is opened, and the water in the sedimentation barrel 1 starts to flow into the No. 2 sampler; otherwise, continuing waiting, and then comparing H2 with H3+70mm once every 10 minutes until H2 is less than or equal to H3+70mm, wherein the PLC 14 controls the detection liquid inlet electromagnetic valve 12 to be opened, and clarified sewage on the upper part of the sedimentation barrel 1 starts to flow into the detection liquid barrel 10;
step 12, accurate pesticide application: according to the data displayed by the data display instrument 15, the water inlet of the denitrification filter tank and the water inlet of the high-efficiency clarification tank are accurately applied with medicine and scientifically scheduled and controlled according to the data.
The precise pesticide application comprises the addition of a destabilizing agent, polyacrylamide, an oxidant and a composite quick-settling agent.
The precise pesticide application also comprises the addition of a carbon source and a phosphorus removal agent.
The scientific dispatching and regulation comprises the accurate aeration of the biological pond.
The present invention has been described in detail with reference to the embodiments of the embodiments, but it should not be construed that the scope of the subject matter of the present invention is limited to the embodiments described above, and all the technologies realized based on the above contents of the present invention are within the scope of the present invention.
Claims (8)
1. The online multi-parameter automatic rapid water quality detection device in the sewage treatment process comprises sludge-water mixed liquid which is being treated in a biological pool and a biological pool, and is characterized in that: the sludge-water mixed liquid in the tail end of the biological tank is communicated with a sewage inlet pipe, the sewage inlet pipe is communicated with a precipitation barrel water pump, and the precipitation barrel water pump is communicated with the precipitation barrel through a water inlet electromagnetic valve; the depth of sewage in the sedimentation barrel is H1, the upper end surface of the sedimentation barrel is provided with a mud level tester, a liquid level limit gauge and a flushing electromagnetic valve, the flushing electromagnetic valve is communicated with a tap water pipe, and the side edge of the upper end of the sedimentation barrel is provided with a sedimentation overflow pipe and is communicated with an emptying pipe; the bottom surface of the sedimentation barrel is communicated with the emptying pipe through a sedimentation barrel drainage electromagnetic valve, the sludge height at the lower part of the sedimentation barrel is H2, and the position which is far away from the detection liquid inlet sampling height H3 below the upper surface of the sedimentation barrel is communicated with the upper end surface of the detection liquid barrel through a detection liquid inlet electromagnetic valve; a detection overflow pipe is arranged on the side edge of the upper end of the detection liquid barrel and is communicated with the emptying pipe; the lower end surface of the detection liquid barrel is communicated with the emptying pipe through a detection liquid discharge electromagnetic valve; the detection liquid barrel is provided with a nitrate nitrogen tester and is communicated with the ammonia nitrogen tester, the total phosphorus tester and the COD tester; the nitrate nitrogen tester, the ammonia nitrogen tester, the total phosphorus tester and the COD tester are respectively and electrically connected with the PLC and the data acquisition instrument; the PLC is respectively and electrically connected with a mud level determinator, a liquid level limit meter, a flushing solenoid valve, a precipitation barrel water inlet solenoid valve, a precipitation barrel water discharge solenoid valve, a detection barrel water inlet solenoid valve, a detection barrel water discharge solenoid valve and a precipitation barrel water pump; the PLC and the sedimentation barrel water pump are respectively and electrically connected with a power supply; the data acquisition instrument is in communication connection with a data display in the dispatching room; the emptying pipe is communicated with the biological pond.
2. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the sedimentation barrel water pump comprises a centrifugal pump or a gear pump or a diaphragm pump or a peristaltic pump.
3. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the sludge height H2 is less than or equal to the sampling height H3 plus 70mm of the detection feed liquor.
4. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the volume of the part above the detection liquid sampling height H3 of the sedimentation barrel is matched with the volume of the detection liquid barrel.
5. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the nitrate nitrogen determinator comprises an electrode determinator or a fluorescence determinator.
6. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the ammonia nitrogen tester comprises a chemical reagent detection method ammonia nitrogen tester.
7. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the total phosphorus determinator comprises a chemical reagent detection method total phosphorus determinator.
8. The on-line multi-parameter automatic rapid water quality detection device in the sewage treatment process according to claim 1, characterized in that: the COD tester comprises a potassium dichromate method COD rapid tester.
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