CN111076982A - Automatic monitoring hybrid sampling pretreatment system and method - Google Patents
Automatic monitoring hybrid sampling pretreatment system and method Download PDFInfo
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- CN111076982A CN111076982A CN201911410567.5A CN201911410567A CN111076982A CN 111076982 A CN111076982 A CN 111076982A CN 201911410567 A CN201911410567 A CN 201911410567A CN 111076982 A CN111076982 A CN 111076982A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 83
- 238000005070 sampling Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000002156 mixing Methods 0.000 claims abstract description 73
- 239000010865 sewage Substances 0.000 claims abstract description 54
- 239000000523 sample Substances 0.000 claims description 115
- 239000007788 liquid Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 14
- 238000012423 maintenance Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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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
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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
- G01N2001/1418—Depression, aspiration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention discloses an automatic monitoring mixed sampling pretreatment system and a method, wherein a sewage inlet pipeline is communicated with a quantitative container through a first branch, and the quantitative container is communicated with a mixing container; the mixing container is respectively communicated with a sampling cup and a sample storage container of the monitoring instrument, and the sample storage container is communicated with a sewage outlet pipeline. Compared with the existing instantaneous sampling, the system and the method can realize the sampling collection and mixing of different time periods in a period of time, provide the sampling collection and mixing for a monitoring instrument for detection, are more representative compared with the instantaneous sampling, and can more accurately reflect the water quality in a period of time.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an automatic monitoring mixed sampling pretreatment system and method.
Background
According to the existing regulations, automatic monitoring equipment is required to be installed for water inlet and outlet of a town sewage treatment plant, and the normal operation of the monitoring equipment is ensured. And the influent water of sewage plant usually contains more suspended solid, and along with the increase of live time, the water sample pipeline jam can appear in the instrument to influence the monitoring. In addition, according to technical requirements of an on-line monitoring system for water quality and water quantity of town drainage, a monitoring instrument needs to obtain a monitoring value every two hours, an existing commonly-used sampling system usually uses instantaneous sampling to supply samples to the instrument, and an instantaneous water sample represents the water quality condition for two hours, so that the instrument is lack of representativeness.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an automatic monitoring hybrid sampling pretreatment system and method.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic monitoring mixing sampling pretreatment system comprises a quantitative container, a mixing container, a sample storage container and a monitoring instrument; the sewage inlet pipeline is communicated with the quantitative container through a first branch, and the quantitative container is communicated with the mixing container; the mixing container is respectively communicated with a sampling cup and a sample storage container of the monitoring instrument, and the sample storage container is communicated with a sewage outlet pipeline; a check valve is arranged at the pipe orifice of the sewage inlet pipeline, and a first water pump, a first electromagnetic valve, a second water pump and a second electromagnetic valve are arranged on the sewage inlet pipeline; a third electromagnetic valve is arranged on the water inlet pipeline of the quantitative container and is communicated with the sewage water inlet pipeline; a fourth electromagnetic valve is arranged on a pipeline for communicating the quantitative container with the mixing container, a pipeline with a fifth electromagnetic valve is communicated with the outlet end of the mixing container, and the pipeline with the fifth electromagnetic valve is respectively communicated with the sampling cup and the sample storage container; a pipeline, communicated with the sewage outlet pipeline, at the tail end of the sampling cup is provided with a sixth electromagnetic valve, the sample storage container is provided with a sample supply port of the equal proportion sampler, and the sample supply port of the equal proportion sampler is communicated with a sampling pipe with a seventh electromagnetic valve; an eighth electromagnetic valve is arranged on a pipeline for communicating the sample storage container with the sewage outlet pipeline; a liquid level sensor is arranged in the quantitative container; the water pump I, the water pump II, the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV, the electromagnetic valve V, the electromagnetic valve VI, the electromagnetic valve VII, the electromagnetic valve VIII, the liquid level sensor and the monitoring instrument are all in communication connection with the PLC.
Furthermore, the system also comprises a monitoring container, the monitoring container is made of organic glass, and the sewage inlet pipeline is communicated with the monitoring container through a branch II; the monitoring container is provided with a pH probe and a suspended matter concentration probe.
Furthermore, the part of the branch II extending into the monitoring container is L-shaped.
Furthermore, an ultrasonic generator and a first stirring device are arranged in the mixing container, and a filtering grid is arranged at the upper part in the mixing container; and the ultrasonic generator and the stirring device are in communication connection with the PLC.
Furthermore, a filtering grid mounting opening is formed in one side of the mixing container, and the filtering grid can enter and exit the mixing container through the filtering grid mounting opening; when the filter mesh is completely inserted into the mixing container, one side of the filter mesh just closes the filter mesh mounting opening.
Furthermore, an overflow port is also arranged on the quantitative container.
Furthermore, a second stirring device is arranged in the sample storage container and is in communication connection with the PLC.
Furthermore, the material of sampling cup is organic glass, adopts threaded connection with the supply appearance pipeline, supply appearance pipeline communicate in the pipeline that takes five solenoid valves.
Further, the sample storage container is provided with a manual sampling port.
The invention also provides a method for utilizing the system, which specifically comprises the following steps:
selectively controlling the first water pump and the first electromagnetic valve or the second electric pump and the second electromagnetic valve to be opened through the PLC, opening the third electromagnetic valve, injecting the sewage sample into the quantitative container, and detecting the liquid level in the quantitative container in real time by the liquid level sensor; when the liquid level sensor detects that the liquid level reaches the required position, a signal is sent to the PLC controller, and the PLC controller controls the electromagnetic valve III to be closed to stop water inflow;
the PLC controls the electromagnetic valve IV to be opened, and the water sample in the quantitative container flows into the mixing container; when the number of times of controlling the water sample to flow into the mixing container reaches a preset number of times, the PLC controller controls the solenoid valve to be opened, the mixed water sample in the mixing container flows to a sampling cup and a sample storage container of the monitoring instrument, the monitoring instrument performs sampling monitoring and stores the water sample in the sample storage container, after the monitoring instrument finishes sampling, the PLC controller controls the solenoid valve to be opened, and the water sample in the sampling cup is discharged from the sewage water outlet pipeline; transmitting the monitoring result to a PLC controller; when the data is abnormal, the PLC controller controls the electromagnetic valve seven to be opened, and the water sample is supplied to the equal-proportion sampler; when the sample storage container needs to be emptied, the PLC controls the electromagnetic valve to be opened eight times, and the water sample in the sample storage container is output from the sewage outlet pipeline.
Furthermore, when a water sample flows into the mixing container, the water sample is filtered by the filtering grids, and when the water sample is controlled to enter the mixing container for the second time or more, the PLC controller also controls the first stirring device and the ultrasonic generator in the mixing container to start working. A
The invention has the beneficial effects that:
1. compared with the existing instantaneous sampling, the system and the method can realize the sampling collection and mixing of different time periods in a period of time, provide the sampling collection and mixing for a monitoring instrument for detection, are more representative compared with the instantaneous sampling, and can more accurately reflect the water quality in a period of time.
2. By arranging the ultrasonic generator and the filtering grid in the mixing container, the pipeline can be effectively prevented from being blocked.
Drawings
Fig. 1 is a schematic structural diagram of a system according to embodiment 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides an automatic monitoring mixed sampling pretreatment system, as shown in fig. 1, comprising a monitoring container 101, a quantifying container 102, a mixing container 103, a sample storage container 104 and a monitoring instrument; the sewage inlet pipeline 201 is communicated with the quantitative container 102 through a branch I, and the quantitative container 102 is communicated with the mixing container 103; the mixing container 103 is respectively communicated with a sampling cup 105 and a sample storage container 104 of the monitoring instrument, and the sample storage container 104 is communicated with a sewage outlet pipeline 202; a sampling pipe orifice of the sewage inlet pipeline 201 is provided with a check valve 1, and the sewage inlet pipeline 201 is provided with a water pump I11, an electromagnetic valve I111, a water pump II 12 and an electromagnetic valve II 112 which are mutually connected in parallel; a water inlet pipeline of the quantitative container is provided with a third electromagnetic valve 113; a fourth electromagnetic valve 114 is arranged on a pipeline for communicating the quantitative container 102 with the mixing container 103, a pipeline with a fifth electromagnetic valve 115 is communicated with the outlet end of the mixing container 103, and the pipeline with the fifth electromagnetic valve 115 is respectively communicated with the sampling cup 105 and the sample storage container 104; a sixth electromagnetic valve 116 is arranged on a pipeline, which is communicated with the sewage outlet pipeline 202, at the tail end of the sampling cup 105, the sample storage container 104 is provided with a sample supply port of an equal proportion sampler, the sample supply port of the equal proportion sampler is communicated with a sampling pipe with a seventh electromagnetic valve 117, and an eighth electromagnetic valve 118 is arranged on a pipeline, which is communicated with the sewage outlet pipeline 202, of the sample storage container 104; a liquid level sensor 162 is arranged in the quantitative container 102; the water pump I10, the water pump II 11, the electromagnetic valve I111, the electromagnetic valve II 112, the electromagnetic valve III 113, the electromagnetic valve IV 114, the electromagnetic valve V115, the electromagnetic valve VI 116, the electromagnetic valve VII 117, the electromagnetic valve VIII 118, the liquid level sensor 162 and the monitoring instrument are all in communication connection with the PLC.
In this embodiment, the monitoring instrument includes COD monitoring instrument, ammonia nitrogen monitoring instrument, total phosphorus monitoring instrument, total nitrogen monitoring instrument, and its sampling cup 105 material is organic glass, passes through threaded connection 155 with the confession appearance pipeline and is connected, and the detachable washs or changes.
Further, a ball valve 121 is arranged on the branch I. The flow rate of the sewage flowing into the quantitative container can be controlled by adjusting the opening degree of the first ball valve 121. When the third electromagnetic valve 113 on the water inlet pipeline of the quantitative container 102 breaks down, the first ball valve 121 can be closed for maintenance.
Furthermore, the monitoring container is made of organic glass, the sewage inlet pipeline 201 is communicated with the monitoring container 101 through a second branch, and a second ball valve 122 is arranged on the second branch; the monitoring vessel 101 is provided with a pH probe 161 and a suspended matter concentration probe 171. Through the monitoring container that organic glass material made, quality of water sample can be observed by naked eye, through pH probe 161, the pH of suspension concentration probe 171 water sample of can also real-time supervision intaking, suspension concentration. The flow rate of the water sample flowing into the monitoring container can be controlled by adjusting the opening of the second ball valve 121. The monitoring is easy and convenient to timely know some instantaneous and sudden abnormal water sample problems.
Furthermore, the part of the second branch extending into the monitoring container 101 is L-shaped. The interference influence of the water flow impact on the pH probe 161 and the suspended matter concentration probe 171 is avoided.
Furthermore, the lower end of the monitoring container 101 is connected to the sewage outlet pipe 202 through a pipe with a ball valve III 123. When the monitoring container 101 needs to be cleaned and maintained, the water sample in the monitoring container 101 flows into the sewage outlet pipe 202 by opening the ball valve 123.
Still further, the overflow port 151 of the monitoring container 101 is connected to the sewage outlet pipe 202 through an overflow pipe.
Furthermore, an overflow port 152 is disposed on one side of the quantitative container 102, and the overflow port 152 is communicated with the sewage outlet pipe 202.
Further, an ultrasonic generator 163 and a first stirring device are arranged in the mixing container 103, and a filtering grid 193 is arranged at the upper part in the mixing container 103; the ultrasonic generator 163 is in communication connection with the PLC controller. In this embodiment, the first stirring device comprises a motor 173 and a stirring paddle 183 drivingly connected to the motor 173, and the motor 173 is communicatively connected to the PLC controller.
Still further, a filter grid mounting opening 2013 is formed in one side of the mixing container 103, and the filter grid 193 can enter and exit the mixing container 103 through the filter grid mounting opening 2013; when the filter grid 193 is fully inserted into the mixing container 103, one side of it just closes the filter grid mounting opening 2013. The filter grid 193 is removable from the mixing vessel through a filter grid mounting opening 2013 to facilitate cleaning maintenance or replacement of the filter screen. In this embodiment, a handle 2023 is disposed on one side of the filter mesh 193 for pushing and pulling the filter screen.
Further, the filter grid 193 is a 20-mesh stainless steel filter screen.
Furthermore, a water distribution pipe 2003 is arranged in the mixing container 103 and above the filtering grid 193, and the water distribution pipe 2003 is communicated with a pipeline for connecting the mixing container 103 and the quantitative container 102; a plurality of water outlets are uniformly distributed on the water distribution pipe 2003. Through the water distribution pipe 2003 and the plurality of water outlets arranged on the water distribution pipe 2003, sewage can uniformly and dispersedly fall into the mixing container, and the mixing efficiency is improved.
Further, the sampling pipe orifice of the sewage inlet pipeline 201 is provided with a check valve 1, so that when the water pump stops, the water sample flows backwards. The pipeline is provided with a first water pump 11, a first electromagnetic valve 111, a second water pump 12 and a second electromagnetic valve 112 which are connected in parallel; the first water pump 11, the second water pump 12, the first electromagnetic valve 111 and the electromagnetic valve 112 are all in communication connection with the PLC. The second water pump 11 is used as a standby water pump, and when the first water pump 11 is abnormal in operation, the second water pump 12 and the electromagnetic valve 112 are switched to be used as a main water pump and a main electromagnetic valve.
Further, the overflow port 154 of the sample storage container 104 is connected to the waste water outlet pipe 202 via an overflow pipe.
Furthermore, the top of the monitoring container 101 is provided with a first openable stainless steel cover plate 131, and the first stainless steel cover plate 131 is provided with a first handle 141. The openable stainless steel cover plate one 131 and the handle one 141 facilitate the opening of the monitoring container for cleaning and maintenance.
Furthermore, the quantitative container 102 is made of stainless steel, a second openable stainless steel cover plate 132 is arranged at the top of the quantitative container, and a second handle 142 is arranged on the second stainless steel cover plate 132. The second openable stainless steel cover plate 132 and the second handle 142 facilitate the opening of the quantitative container 102 for cleaning and maintenance.
Further, the mixing container 103 is made of stainless steel, a semi-opening and closing stainless steel cover plate is arranged at the top of the mixing container, and the mixing container 103 can be conveniently opened for cleaning and maintenance through the handle III 143.
Further, a second stirring device is arranged in the sample storage container 104. In this embodiment, the second stirring device includes a motor 174 and a stirring paddle 184 drivingly connected to the motor 174, and the motor 174 is communicatively connected to the PLC controller.
Furthermore, one side of the sample storage container 104 is communicated with a sampling tube 164, the sampling tube 164 is communicated with an equal proportion sampler (not shown) through a pipeline with a seven electromagnetic valve 117, and the seven electromagnetic valve 117 is in communication connection with the PLC controller. Through the control of the PLC, the seven 117 electromagnetic valves can be opened to convey water samples to the equal-proportion sampler.
Further, the sampling tube 164 is connected to a manual sampling tube with a ball valve six 126. Manual sampling from the sample storage container 104 may also be performed by opening ball valve six 126.
Further, the sample storage container 104 is made of stainless steel, a third openable stainless steel cover plate 134 is arranged at the top of the sample storage container, and a third handle 144 is arranged at the top of the third stainless steel cover plate 134. The openable stainless steel cover plate III 134 and the handle III 144 facilitate the opening of the sample storage container 104 for cleaning and maintenance.
The sample storage container 104 is used for providing a water sample for the equal proportion sampler and is provided with an artificial sampling port. When the monitoring result of the monitoring instrument is an abnormal value, the PLC triggers the second stirring device to work, and the water sample is stirred for 10 seconds (adjustable). An equal proportion sampler can be adopted to extract a water sample from the sample storage barrel for storage, and the sample is provided for subsequent manual monitoring.
Furthermore, the monitoring container, the quantitative container, the mixing container and the sample storage container are funnel-shaped.
Further, the outlet of the quantitative container 102 is connected to the sewage outlet pipe 202 through a pipe with a ball valve four 124. In the non-monitoring state, the fourth ball valve 124 can be opened to discharge the sewage in the quantitative container 102 directly to the sewage outlet pipeline 202 to clean the quantitative container 102.
Further, the outlet of the mixing container 103 is communicated with a sewage outlet pipe 202 through a pipe with a ball valve five 125. Likewise, in the non-monitoring state, the ball valve five 125 can be opened to discharge the sewage in the mixing container 103 directly to the sewage outlet pipe 202 to clean the mixing container 103.
Furthermore, the tail end of the sampling cup 105 of the monitoring instrument is directly communicated with the sewage outlet pipeline 202 through a pipeline with a six-solenoid valve 116, and the six-solenoid valve 116 is in communication connection with the PLC. After the monitoring instrument finishes sampling, the PLC controls the solenoid valve to open, and the water sample in the water sample cup 106 is discharged from the sewage outlet pipeline 202.
Example 2
The present embodiment provides a method for using the system of embodiment 1, which specifically includes:
the PLC selects to open the first water pump and the first electromagnetic valve or the second water pump and the second electromagnetic valve, the third electromagnetic valve is opened every set time (for example, 15 minutes, and can be adjusted according to actual needs), the sewage water sample is injected into the quantitative container, and the liquid level sensor detects the liquid level in the quantitative container in real time; when the liquid level sensor detects that the liquid level reaches a required position (can be adjusted), a signal is sent to the PLC controller, the PLC controller controls the electromagnetic valve III in front of the quantitative container to be closed, and water inlet is stopped;
the PLC controls the electromagnetic valve IV to be opened, and the water sample in the quantitative container flows into the mixing container; when the number of times of controlling the water sample to flow into mixing container reaches predetermined number of times, PLC controller control solenoid valve five is opened, and the mixed water sample in the mixing container flows to monitoring instrument's sampling cup and sample storage container, supplies monitoring instrument to carry out the sampling monitoring and persist the water sample in sample storage container. After the monitoring instrument finishes sampling, the PLC controls the solenoid valve to open, and the water sample in the water sample cup is discharged from the sewage outlet pipeline. Transmitting the monitoring result to a PLC controller; when the data is abnormal, the PLC controller controls the electromagnetic valve seven to be opened, and the water sample is supplied to the equal-proportion sampler. When the sample storage container needs to be emptied, the PLC controls the electromagnetic valve to be opened eight times, and the water sample in the sample storage container is output from the sewage outlet pipeline.
Furthermore, when a water sample flows into the mixing container, the water sample is filtered by the filtering grids, and when the water sample is controlled to enter the mixing container for the second time or more, the PLC controller also controls the first stirring device and the ultrasonic generator in the mixing container to start working. Can filter the great impurity of granule through filtering the net, and supersonic generator then can vibrate the granule and make its granularity littleer, combines the stirring of agitating unit one, can prevent effectively that various impurity from plugging up the pipeline.
Further, the sewage water sample flows into the monitoring container through a sewage water inlet pipeline and a branch, and the flow rate of the water sample flowing into the monitoring container is controlled by adjusting the opening of the second ball valve; and the pH probe and the suspended matter concentration probe detect and monitor the pH value and the suspended matter concentration change of the water sample in the container in real time.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (11)
1. An automatic monitoring mixing sampling pretreatment system is characterized by comprising a quantitative container, a mixing container, a sample storage container and a monitoring instrument; the sewage inlet pipeline is communicated with the quantitative container through a first branch, and the quantitative container is communicated with the mixing container; the mixing container is respectively communicated with a sampling cup and a sample storage container of the monitoring instrument, and the sample storage container is communicated with a sewage outlet pipeline; a check valve is arranged at the pipe orifice of the sewage inlet pipeline, and a first water pump, a first electromagnetic valve, a second water pump and a second electromagnetic valve are arranged on the sewage inlet pipeline; a third electromagnetic valve is arranged on the water inlet pipeline of the quantitative container and is communicated with the sewage water inlet pipeline; a fourth electromagnetic valve is arranged on a pipeline for communicating the quantitative container with the mixing container, a pipeline with a fifth electromagnetic valve is communicated with the outlet end of the mixing container, and the pipeline with the fifth electromagnetic valve is respectively communicated with the sampling cup and the sample storage container; a pipeline, communicated with the sewage outlet pipeline, at the tail end of the sampling cup is provided with a sixth electromagnetic valve, the sample storage container is provided with a sample supply port of the equal proportion sampler, and the sample supply port of the equal proportion sampler is communicated with a sampling pipe with a seventh electromagnetic valve; an eighth electromagnetic valve is arranged on a pipeline for communicating the sample storage container with the sewage outlet pipeline; a liquid level sensor is arranged in the quantitative container; the water pump I, the water pump II, the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV, the electromagnetic valve V, the electromagnetic valve VI, the electromagnetic valve VII, the electromagnetic valve VIII, the liquid level sensor and the monitoring instrument are all in communication connection with the PLC.
2. The automatic monitoring, mixing and sampling pretreatment system of claim 1, further comprising a monitoring container made of organic glass, wherein the sewage inlet pipeline is communicated with the monitoring container through a branch two; the monitoring container is provided with a pH probe and a suspended matter concentration probe.
3. The automated monitored mixed sampling pretreatment system of claim 2, wherein the portion of said second branch extending into the monitoring vessel is L-shaped.
4. The automatic monitoring, mixing and sampling pretreatment system of claim 1, wherein an ultrasonic generator and a first stirring device are arranged in the mixing container, and a filtering grid is arranged at the upper part in the mixing container; and the ultrasonic generator and the stirring device are in communication connection with the PLC.
5. The automated monitored mixed sampling pretreatment system of claim 4, wherein a side of said mixing vessel is provided with a filter mesh mounting port through which said filter mesh may enter and exit said mixing vessel; when the filter mesh is completely inserted into the mixing container, one side of the filter mesh just closes the filter mesh mounting opening.
6. The automated monitored mixed sample pretreatment system of claim 1, wherein said dosing container further comprises an overflow port.
7. The automatic monitoring, mixing and sampling pretreatment system of claim 1, wherein a second stirring device is arranged in the sample storage container, and the second stirring device is in communication connection with the PLC.
8. The automatic monitoring and mixing sampling pretreatment system according to claim 1, wherein the sampling cup is made of organic glass and is in threaded connection with a sample supply pipeline, and the sample supply pipeline is communicated with the pipeline with the solenoid valve five.
9. The automated monitored mixed sampling pretreatment system of claim 1, wherein said sample storage container is provided with a manual sampling port.
10. A method for using the system of any one of the preceding claims, in particular:
selectively controlling the first water pump and the first electromagnetic valve or the second electric pump and the second electromagnetic valve to be opened through the PLC, opening the third electromagnetic valve, injecting the sewage sample into the quantitative container, and detecting the liquid level in the quantitative container in real time by the liquid level sensor; when the liquid level sensor detects that the liquid level reaches the required position, a signal is sent to the PLC controller, and the PLC controller controls the electromagnetic valve III to be closed to stop water inflow;
the PLC controls the electromagnetic valve IV to be opened, and the water sample in the quantitative container flows into the mixing container; when the number of times of controlling the water sample to flow into the mixing container reaches a preset number of times, the PLC controller controls the solenoid valve to be opened, the mixed water sample in the mixing container flows to a sampling cup and a sample storage container of the monitoring instrument, the monitoring instrument performs sampling monitoring and stores the water sample in the sample storage container, after the monitoring instrument finishes sampling, the PLC controller controls the solenoid valve to be opened, and the water sample in the sampling cup is discharged from the sewage water outlet pipeline; transmitting the monitoring result to a PLC controller; when the data is abnormal, the PLC controller controls the electromagnetic valve seven to be opened, and the water sample is supplied to the equal-proportion sampler; when the sample storage container needs to be emptied, the PLC controls the electromagnetic valve to be opened eight times, and the water sample in the sample storage container is output from the sewage outlet pipeline.
11. The method as claimed in claim 10, wherein the water sample is filtered by the filter mesh when flowing into the mixing container, and the PLC controller further controls the first stirring device and the ultrasonic generator in the mixing container to start when the water sample is controlled to enter the mixing container for the second time or more.
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