CN110632267A - System and method for continuously measuring high-concentration sewage exceeding application range of online instrument - Google Patents
System and method for continuously measuring high-concentration sewage exceeding application range of online instrument Download PDFInfo
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- CN110632267A CN110632267A CN201910709843.1A CN201910709843A CN110632267A CN 110632267 A CN110632267 A CN 110632267A CN 201910709843 A CN201910709843 A CN 201910709843A CN 110632267 A CN110632267 A CN 110632267A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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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
Abstract
The invention discloses a continuous measuring system and method for high-concentration sewage exceeding the application range of an online instrument, and belongs to the technical field of wastewater treatment. The determination method comprises the following steps: dilution metering pump according to QThin paperFlow draw concentration of CThin paperDilution water of (1), sampling metering pump according to QSample (A)The flow of the water sample to be tested is extracted, the water sample and the sewage sample to be tested are hydraulically and uniformly mixed in the pipeline mixer, then enter the mixed water storage tank and overflow and flow out, if the water sample determination of the mixed water storage tank meets the measuring range of the mixed water concentration measuring instrument, the PLC directly and automatically calculates the concentration C of the sewage sample to be tested according to the obtained mixed water concentrationSample (A)If the water sample concentration of the mixed water storage tank exceeds the measuring range of the instrument, the flow of the dilution water is increased or the flow of the sewage to be measured is reduced, and the concentration of the mixed water is updated by utilizing the hydraulic action until the concentration of the mixed water is in the concentration measuring instrument of the mixed waterThe measuring range is wide. The method can realize continuous measurement of high-concentration sewage exceeding the applicable range of the on-line instrument.
Description
Technical Field
The invention relates to a continuous measuring system and method for sewage, in particular to a continuous measuring system and method for high-concentration sewage exceeding the application range of an online instrument, and belongs to the technical field of wastewater treatment.
Background
The online instrument can obtain the sewage quality index in real time, is a precondition for realizing the intelligent operation of sewage treatment and is an important indication for the normal operation of sewage treatment engineering, so the online instrument can be applied to a plurality of sewage treatment engineering. In order to improve the measurement accuracy, different online meters have respective measurement ranges, namely ranges, for example, the range of the COD online meter is generally below 5000mg/L, the range of the ammonia nitrogen online meter is generally 80mg/L, and the individual range can reach 1000 mg/L. The measuring range of the meters can meet the measurement of most sewage samples, and the meters are the products with the largest supply quantity in the current market. However, in fact, the raw water concentration of many sewages is very high, such as breeding wastewater, slaughter wastewater, landfill leachate, etc., the COD of the sewage often exceeds 10000mg/L, and the conventional meter is difficult to meet the online measurement requirement, so that the intelligent management process for treating the ultrahigh-concentration wastewater is limited, and therefore, it is necessary to develop a continuous measurement method for an online meter which can be suitable for the ultrahigh-concentration sewage. The invention patent with publication number CN103868782A discloses a dilution system and a dilution method of an automatic on-line fishery water quality monitoring system, which can realize on-line monitoring of fishery water quality with higher concentration, but the system has a more complex structure and is difficult to realize continuous measurement of water quality.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for continuously measuring high-concentration sewage exceeding the application range of an online instrument.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the continuous measuring system for the concentration of high-concentration sewage exceeding the application range of the on-line instrument comprises a dilution water storage tank, a dilution water concentration measuring instrument, a dilution metering pump, a sampling metering pump, a pipeline mixer, a mixed water storage tank, a mixed water concentration measuring instrument and a PLC (programmable logic controller), wherein the dilution water concentration measuring instrumentThe dilution metering pump is used for detecting the concentration of dilution water in the dilution water storage tank and sending detected concentration data to the PLC, and the dilution metering pump is used for enabling the flow to be QThin paperThe dilution water is pumped into a pipeline mixer, and the flow of the dilution water is Q by a sampling metering pumpSample (A)The high concentration sewage water sample that awaits measuring extract to the pipe-line mixer in, the pipe-line mixer is used for evenly mixing sewage and dilution water conservancy, the mixed water storage tank top is equipped with the overflow mouth with the overflow pipe intercommunication, and the bottom is equipped with the dendritic pipe of intaking that is linked together with the pipe-line mixer, the volume V of mixed water storage tankMixing of＜t(QThin paper+QSample (A)) And t is the test interval time of two sewage water samples to be tested of the mixed water concentration measuring instrument, the mixed water concentration measuring instrument is arranged in the mixed water storage tank and is used for detecting the concentration of the mixed water in the mixed water storage tank and sending the detected concentration data to the PLC, the PLC is electrically connected with the dilution metering pump, the sampling metering pump, the dilution water concentration measuring instrument and the mixed water concentration measuring instrument, and the PLC calculates the concentration of the sewage water sample to be tested according to the received mixed water concentration data in the range of the mixed water concentration side-measuring instrument.
Preferably, the maximum flow of the dilution metering pump is 2 times higher than that of the sampling metering pump;
the continuous measuring method for the concentration of the high-concentration sewage exceeding the application range of the on-line instrument by adopting the system comprises the following steps: when determining a certain high-concentration sewage sample to be measured, diluting and metering the pump according to QThin paperThe flow rate of (2) is such that the concentration in the dilution water reservoir is CThin paperThe dilution water is pumped into the pipeline mixer, wherein the concentration data of the dilution water is detected by the dilution water concentration measuring instrument and transmitted to the PLC, and the sampling metering pump is according to QSample (A)The flow that will await measuring high concentration sewage water sample extraction to the pipe-line mixer in, the sewage that awaits measuring forms the mixed water with the dilution water behind the hydraulic homogeneous mixing in the pipe-line mixer, the mixed water gets into and evenly rises to overflow mouth back through the overflow pipe discharge from the dendritic pipe of intaking of mixed water storage tank bottom, wherein, the concentration data of mixed water detects and transmits PLC for by mixed water concentration measuring apparatu in the mixed water storage tank, PLC will received thoughtlessly mix the water concentration measuring apparatu with receivingThe range of the mixed water concentration data and the range of the mixed water concentration measuring instrument are compared, when the mixed water concentration data are in the range of the mixed water concentration side measuring instrument, the mixed water concentration measuring instrument is in a normal display state, the PLC directly obtains the mixed water concentration data, and the concentration C of the sewage sample to be tested is automatically calculated according to the formula ISample (A)When the concentration data of the mixed water exceeds the range of the concentration measuring instrument of the mixed water, the concentration measuring instrument of the mixed water is in an abnormal display state, the PLC sends an instruction, the flow of the dilution metering pump or the sampling metering pump is adjusted to increase the flow of the dilution water or reduce the flow of the sewage sample to be measured, and the concentration of the mixed water is updated by fully utilizing the hydraulic action until the concentration of the mixed water is within the range of the concentration measuring instrument of the mixed water;
and after the concentration of one high-concentration sewage water sample to be measured is measured, overflowing and draining water for t time, and measuring the next high-concentration sewage water sample to be measured by adopting the same method.
Preferably, the dilution water is distilled water.
From the above description, it can be seen that the present invention has the following advantages:
1. the invention can make the measuring range meet the measuring range requirement of the existing on-line instrument by an automatic dilution method, and realizes the continuous measurement of the high-concentration sewage exceeding the applicable measuring range of the on-line instrument. The measuring system of the invention has simple structure and the measuring method is simple and convenient to operate.
2. According to the invention, by optimizing the volume of the mixed hydraulic tank, overflow of more than 3 times of hydraulic flushing time can be ensured, so that water in the mixed water storage tank is completely updated in the test interval time of two sewage samples to be tested of the mixed water concentration measuring instrument, the accuracy of the test result of the sewage samples is ensured, and meanwhile, continuous measurement of a plurality of high-concentration sewage samples exceeding the application range of the on-line instrument is realized.
3. The invention can select various water sources with stable concentration, such as distilled water, tap water, advanced treatment water and the like as dilution water to measure the concentration of the sewage, and has wide application range. When the dilution water is distilled water, the measuring system can omit a dilution water concentration measuring instrument, and the cost is reduced.
Drawings
FIG. 1 is a schematic view of the configuration of a continuous measuring system according to the present invention;
reference numerals:
1. a dilution water storage tank 2, a dilution water concentration measuring instrument 3, a dilution metering pump 4, a sampling metering pump 5, a pipeline mixer 6, a mixed water storage tank 61, an overflow port 62, a water inlet branched pipe 7, a mixed water concentration measuring instrument 8, a PLC
Detailed Description
The features of the invention will be further elucidated by the following examples, without limiting the claims of the invention in any way.
Example 1:
the utility model provides a continuous survey system to high concentration sewage concentration that surpasss online instrument application range, includes dilution water storage tank 1, dilution water concentration measuring apparatu 2, dilution measuring pump 3, sample measuring pump 4, pipeline mixer 5, mixed water storage tank 6, mixed water concentration measuring apparatu 7 and PLC8, dilution water concentration measuring apparatu 2 is arranged in detecting the concentration of the dilution water in dilution water storage tank 1 and sends the concentration data that detect to PLC8, dilution measuring pump 3 is used for being Q flow with the flowThin paperThe dilution water of (a) is pumped into a line mixer 5, and the sampling metering pump 4 pumps the dilution water with a flow rate of QSample (A)The high concentration sewage water sample that awaits measuring extract to pipe mixer 5 in, the maximum flow of sample measuring pump 4 is less than 1/2 of the maximum flow of dilution measuring pump 3, pipe mixer 5 is used for sewage and dilution water conservancy homogeneous mixing, mixed water storage tank 6 top is equipped with the overflow mouth 61 with the overflow pipe intercommunication, and the bottom is equipped with the dendritic pipe 62 of intaking that is linked together with pipe mixer 5, mixed water storage tank 6's volume VMixing of＜t(QThin paper+QSample (A)) A/3, wherein t is the test interval time of two sewage water samples to be tested of the mixed water concentration measuring instrument, the mixed water concentration measuring instrument 7 is arranged in the mixed water storage tank 6, and the mixed water concentration measuring instrument 7 is used for detecting the concentration of the mixed water in the mixed water storage tank 6 and detecting the concentrationThe obtained concentration data is sent to a PLC8, the PLC8 is electrically connected with a dilution metering pump 3, a sampling metering pump 4, a dilution water concentration measuring instrument 2 and a mixed water concentration measuring instrument 7, and the PLC8 calculates the concentration of the sewage sample to be tested according to the received mixed water concentration data within the measuring range of the mixed water concentration lateral measuring instrument.
The continuous measuring method for the concentration of the high-concentration sewage exceeding the application range of the on-line instrument by adopting the system comprises the following steps: when determining a certain high-concentration sewage sample to be measured, the dilution metering pump 3 is in accordance with QThin paperThe flow rate of (2) is such that the concentration in the dilution water reservoir 1 is CThin paperThe dilution water is pumped into the line mixer 5, wherein the concentration data of the dilution water is detected by the dilution water concentration measuring instrument 2 and transmitted to the PLC8, and the sampling metering pump 4 is according to QSample (A)The flow of the mixed water is that a high-concentration sewage sample to be measured is pumped into the pipeline mixer 5, the sewage to be measured and the dilution water are mixed uniformly in the pipeline mixer 5 under the action of hydraulic force to form mixed water, the mixed water enters from a water inlet branched pipe at the bottom of the mixed water storage tank 6 and uniformly rises to an overflow port and then is discharged through an overflow pipe, wherein, the concentration data of the mixed water in the mixed water storage tank 6 is detected by the mixed water concentration measuring instrument 7 and is transmitted to the PLC8, the PLC8 compares the received mixed water concentration data with the measuring range of the mixed water concentration measuring instrument 7, when the mixed water concentration data is in the range of the mixed water concentration lateral measuring instrument, the mixed water concentration measuring instrument 7 is in a normal display state, the mixed water concentration data measured by the mixed water concentration measuring instrument 7 is accurate concentration data, the PLC8 directly obtains the mixed water concentration data, and the concentration C of the sewage water sample to be tested is automatically calculated according to the formula I.Sample (A)When the concentration data of the mixed water exceeds the measuring range of the concentration measuring instrument 7 of the mixed water, the concentration measuring instrument 7 of the mixed water is in an abnormal display state, the concentration data of the mixed water measured by the concentration measuring instrument 7 of the mixed water is inaccurate concentration data, the PLC8 sends out an instruction, the flow of the dilution metering pump 3 or the sampling metering pump 4 is adjusted to increase the flow of the dilution water or reduce the flow of the sewage to be measured, and the concentration of the mixed water is updated by utilizing the hydraulic action until the concentration of the mixed water is within the measuring range of the concentration measuring instrument of the mixed water;
and after the concentration of one high-concentration sewage water sample to be measured is measured, overflowing and draining water for t time, and measuring the next high-concentration sewage water sample to be measured by adopting the same method.
In the above embodiment, the dilution water concentration measuring instrument 2 and the mixed water concentration measuring instrument 7 are both conventional online instruments for detecting the concentration of liquid, and the PLC8 is a programmable logic controller; the dilution water may be distilled water, in this case, CThin paper＝0。
The concentration results of 3 times of wastewater samples of certain aquaculture wastewater (average COD concentration of 15000mg/L and maximum value of 28000mg/L) are measured by the continuous measuring method (the dilution water is distilled water, and the maximum range of the mixed water concentration measuring instrument 7 is 5000mg/L), and the concentration results of each time of measurement are respectively compared with the manual analysis results of a laboratory, and the absolute values of relative errors are respectively 7.2%, 7.6% and 8.0%.
Comparative example 1:
3 times of wastewater samples of a certain aquaculture wastewater (average COD concentration of 15000mg/L, maximum of 28000mg/L) were measured by the same test method as in example 1 (distilled water is used as dilution water, and the maximum range of the mixed water concentration measuring instrument 7 is 5000mg/L), except that the volume of the mixed water storage tank 6 in the test system used was VMixing of＝t(QThin paper+QSample (A)) And/2, comparing the concentration result of each measurement with the result of laboratory manual analysis, wherein the absolute values of relative errors are 7.3%, 9.5% and 11.2% respectively.
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (4)
1. High concentration for exceeding on-line instrument application rangeThe continuous measuring system for the concentration of the sewage is characterized by comprising a dilution water storage tank, a dilution water concentration measuring instrument, a dilution metering pump, a sampling metering pump, a pipeline mixer, a mixed water storage tank, a mixed water concentration measuring instrument and a PLC (programmable logic controller), wherein the dilution water concentration measuring instrument is used for detecting the concentration of the dilution water in the dilution water storage tank and sending the detected concentration data to the PLC, and the dilution metering pump is used for enabling the flow to be QThin paperThe dilution water is pumped into a pipeline mixer, and the flow of the dilution water is Q by a sampling metering pumpSample (A)The high concentration sewage water sample that awaits measuring extract to the pipe-line mixer in, the pipe-line mixer is used for evenly mixing sewage and dilution water conservancy, the mixed water storage tank top is equipped with the overflow mouth with the overflow pipe intercommunication, and the bottom is equipped with the dendritic pipe of intaking that is linked together with the pipe-line mixer, the volume V of mixed water storage tankMixing of＜t(QThin paper+QSample (A)) And t is the test interval time of two sewage water samples to be tested of the mixed water concentration measuring instrument, the mixed water concentration measuring instrument is arranged in the mixed water storage tank and is used for detecting the concentration of the mixed water in the mixed water storage tank and sending the detected concentration data to the PLC, the PLC is electrically connected with the dilution metering pump, the sampling metering pump, the dilution water concentration measuring instrument and the mixed water concentration measuring instrument, and the PLC calculates the concentration of the sewage water sample to be tested according to the received mixed water concentration data in the range of the mixed water concentration side-measuring instrument.
2. The continuous assay system of claim 1, wherein the maximum flow rate of the dilution metering pump is greater than 2 times the maximum flow rate of the sampling metering pump.
3. A method for continuously measuring the concentration of high-concentration sewage exceeding the applicable range of an online meter by using the system of any one of claims 1 or 2, which is characterized by comprising the following steps: when determining a certain high-concentration sewage sample to be measured, diluting and metering the pump according to QThin paperThe flow rate of (2) is such that the concentration in the dilution water reservoir is CThin paperThe dilution water is pumped into a line mixer, wherein the concentration data of the dilution water is detected and transmitted by a dilution water concentration measuring instrumentFor PLC, the sampling metering pump is according to QSample (A)The flow with the high concentration sewage water sample extraction that awaits measuring to the pipe mixer in, the sewage that awaits measuring forms the mixed water with the dilution water behind the hydraulic homogeneous mixing in the pipe mixer, the mixed water gets into and evenly rises to overflow mouth back through the overflow pipe discharge from the branch pipe of intaking of mixed water storage tank bottom, wherein, the concentration data of mixed water detects and transmits for PLC by mixed water concentration measuring apparatu in the mixed water storage tank, PLC compares received mixed water concentration data and mixed water concentration measuring apparatu's range, when mixed water concentration data is in the range of mixed water concentration side measuring apparatu, mixed water concentration measuring apparatu is in normal display state, PLC directly acquires this mixed water concentration data, and the concentration C who awaits measuring according to the water sample formula I automatic calculation awaits measuring sewage water sampleSample (A)When the concentration data of the mixed water exceeds the range of the concentration measuring instrument of the mixed water, the concentration measuring instrument of the mixed water is in an abnormal display state, the PLC sends an instruction, the flow of the dilution metering pump or the sampling metering pump is adjusted to increase the flow of the dilution water or reduce the flow of the sewage sample to be measured, and the concentration of the mixed water is updated by fully utilizing the hydraulic action until the concentration of the mixed water is within the range of the concentration measuring instrument of the mixed water;
and after the concentration of one high-concentration sewage water sample to be measured is measured, overflowing and draining water for t time, and measuring the next high-concentration sewage water sample to be measured by adopting the same method.
4. The continuous assay system of claim 3, wherein the dilution water is distilled water.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161978A (en) * | 2020-09-29 | 2021-01-01 | 上海亨通海洋装备有限公司 | Nutrient salt water quality analyzer |
| CN113820196A (en) * | 2021-09-01 | 2021-12-21 | 中国科学院地理科学与资源研究所 | CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof |
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| CN103091152A (en) * | 2013-02-21 | 2013-05-08 | 广州伊创仪器有限公司 | Intelligent dilution system and intelligent dilution method for on-line analyzer |
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| CN107364550A (en) * | 2017-06-26 | 2017-11-21 | 中国水产科学研究院淡水渔业研究中心 | fishery water quality online automatic detection ship |
| CN107560923A (en) * | 2017-08-24 | 2018-01-09 | 天津市华宇膜技术有限公司 | A kind of water sample dilution system and method for expanding online water quality detection range |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09269320A (en) * | 1996-04-02 | 1997-10-14 | Kubota Corp | Water quality meter |
| CN101000341A (en) * | 2006-12-29 | 2007-07-18 | 中国科学院长春应用化学研究所 | Sensor type on-line monitor of biochemical oxygen demand |
| CN103091152A (en) * | 2013-02-21 | 2013-05-08 | 广州伊创仪器有限公司 | Intelligent dilution system and intelligent dilution method for on-line analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161978A (en) * | 2020-09-29 | 2021-01-01 | 上海亨通海洋装备有限公司 | Nutrient salt water quality analyzer |
| CN113820196A (en) * | 2021-09-01 | 2021-12-21 | 中国科学院地理科学与资源研究所 | CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof |
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Application publication date: 20191231 |