CN100483100C - Waste-water on-line monitoring synchronous sampling sample-leaving system - Google Patents

Abstract

The invention relates to measurement, especially to a monitoring system capable of performing real-time sampling and retaining samples of waste water exceeding the standard during the on-line monitoring of industrial waste water discharge. A wastewater on-line monitoring synchronous sampling-sample retention system, including a water intake pump, an automatic analyzer, an automatic water sampler, and a computer control center, is characterized in that: there are sample retention tanks equal to the number of automatic analyzers, and each A sample retention tank and a pipeline for an automatic analysis measuring instrument are connected in parallel between the water intake pump and the waste water outlet pipeline, and each automatic water sampler is respectively connected with a corresponding pipeline for the sample retention tank. The invention solves the technical problem of the synchronization and consistency of the reserved sample wastewater and the measured wastewater exceeding the standard, and secondly solves the technical problem of system pipelines polluting the sample.

Description

Synchronous sampling of wastewater online monitoring - sample retention system

Technical field:

The invention relates to measurement, especially to a monitoring system capable of performing real-time sampling and retaining samples of waste water exceeding the standard during the on-line monitoring of industrial waste water discharge.

current technology:

The pollution and harm caused by industrial wastewater discharge to the ecological environment have been recognized by the world. For this reason, all countries are enacting legislation to formulate sewage discharge standards and punishment regulations to supervise and manage them, and the environmental monitoring technology that is the basis of supervision and management is also Continuous development and improvement, wastewater online monitoring technology is an environmental monitoring technology that has developed rapidly in recent years. It can conduct real-time and continuous automatic monitoring of wastewater discharged from industrial pollution sources, which is of great significance for improving the total amount of pollutants control and environmental management capabilities. . Due to the complexity and uncertainty of industrial wastewater, on-line monitoring of wastewater generally requires automatic sampling of industrial wastewater that exceeds the standard and analysis of reserved samples. At present, these wastewater on-line monitoring systems are composed of automatic analyzers, automatic water samplers and computer control centers. The system is installed near the wastewater discharge outlet of the pollution source, and the measured data is transmitted to the monitoring center in real time using wired or wireless transfer technology. Unmanned automatic operation is realized, but the system has the following defects in use:

1. The automatic water sampler needs to measure the data for a certain period of time by various automatic analysis and measuring instruments (such as PH meter, COD chemical oxygen demand analyzer, TOC total organic carbon analyzer, etc.), and judge whether it exceeds the standard by the computer control center. , only when the computer control center sends an instruction to start collecting the reserved samples when the standard is exceeded. Since the automatic water sampler, like the automatic analyzer, draws waste water from the weir flume (such as Parshall flume, triangular weir flume, rectangular weir flume, etc.), and the waste water in the weir flume is constantly flowing. , When it is determined that the sample needs to be retained, the wastewater in the weir flume is no longer the wastewater during the instrumental analysis and measurement, that is to say, the system has the problem of distortion of the reserved sample due to the sampling lag of the reserved sample.

2. If the sample is not to be distorted, it is necessary to retain the sample while the analyzer is measuring, which means that no matter whether the monitored sewage exceeds the standard, it must be retained. In this way, the excess wastewater can be effectively retained The sample rate is very low, and the number of samples retained by the automatic water sampler is limited. Only 24 samples can be retained. It is necessary for the monitoring personnel to drive to the unmanned monitoring station every day to process the reserved samples and reset the program, so that the sample retention program can be completed. keep running. And the quantity of automatic sewage monitoring stations in a big city is very huge, which will cause a lot of consumption and expenditure of manpower, material resources and financial resources.

3. The pipes in the sampling system are made of plastics containing chlorine, such as PVC (polyvinyl chloride), UPVC (hard polyvinyl chloride), etc. If these pipes meet industrial wastewater in a strong acid-base state, there will be trace amounts of The precipitation of chloride ions will cause secondary pollution, affect the results of analysis and measurement, and is not conducive to the fairness and scientificity of pollution supervision and law enforcement.

Invention content:

The purpose of the present invention is to provide a kind of wastewater online monitoring synchronous sampling - sample retention system, which mainly solves the technical problem of the simultaneity and consistency of the retained sample wastewater and the measured wastewater exceeding the standard, and secondly solves the problem of sample pollution by the sampling system pipeline technical problem.

The technical scheme that the present invention solves the problems of the technologies described above is as follows:

A wastewater on-line monitoring synchronous sampling-sample retention system, including a water intake pump, an automatic analyzer, an automatic water sampler, and a computer control center, is characterized in that: there are sample retention tanks equal to the number of automatic analyzers, and each The sample retention tank and an automatic analyzer pipeline are connected in parallel between the water intake pump and the waste water outlet pipeline, and each water automatic sampler is respectively connected with a corresponding pipeline for the sample retention tank.

It is characterized in that: the system is an integrated system that is connected correspondingly with each parallel automatic analyzer and sample retention tank by a pipeline for a water intake pump; The analytical measuring instrument and the sample storage tank are connected correspondingly and are a split system composed of mutually independent subsystems.

It is characterized in that the connecting pipeline in the system is a chlorine-free polyethylene pipe, a chlorine-free polypropylene pipe or a chlorine-free PPR pipe.

The present invention has following beneficial effect:

1. The system can be divided and combined according to different measured items and measurement frequencies, and can be flexibly selected and set, so as to achieve the purpose of sampling, analysis and retesting of reserved samples.

2. At the same time of analysis and measurement, the real-time wastewater can be stored in the sample storage tank synchronously, and the sample will be collected by the automatic water sampler when it exceeds the standard.

3. The sample retention tank can regenerate the waste water by itself, so there is no need to set up special drainage facilities, which simplifies the equipment structure and improves the reliability of the system operation.

4. The samples retained by the system of the present invention can reflect the authenticity and representativeness of the wastewater exceeding the standard immediately, and provide a strong basis for administrative law enforcement.

5. The system itself eliminates the possibility of secondary pollution and improves the accuracy of measurement.

Description of drawings:

The accompanying drawing is a schematic diagram of a system configuration of the present invention.

Detailed ways:

Please refer to the accompanying drawings and show that the present invention is arranged in the automatic monitoring station near the waste water outlet of the enterprise. The synchronous sampling-sample retention system described in the present invention includes an automatic analysis and determination instrument 1, an automatic water sampler 4, a computer control center 5 and a water intake pump 6, and is provided with a dedicated sample retention tank 2. The variety and quantity of automatic analysis measuring instrument 1 in the system are determined by the number of items measured, such as PH (pH) meter, COD (chemical oxygen demand) analyzer, TOC (total organic carbon) analyzer, total phosphorus analyzer, Fluoride analyzer, chloride analyzer, nitrate analyzer, alkalinity analyzer, copper analyzer, ammonia ion analyzer, turbidity analyzer, chlorine ammonia analyzer, UV organic matter analyzer, conventional five-parameter analyzer, Ammonia nitrogen and total nitrogen analyzers, permanganate analyzers, etc.; the number of automatic water samplers 4 is equal to the number of automatic analyzers 1. The synchronous sampling of the present invention-sample retention system is provided with the same number of sample retention tanks 2 as the automatic analysis measuring instrument 1, and each automatic analysis measuring instrument 1 is connected in parallel with the liquid inlet of a corresponding sample retention tank 2, and through the pipe The road is connected to the water intake pump 6 of the sampling part near the water inlet of the weir flume 7 (such as Parshall flume, triangular weir flume, Wenquli flume, or rectangular weir flume, etc.), and their water outlets are connected by pipelines respectively. It is connected with the wastewater discharge pipe 3 of the enterprise; each sample retention tank 2 is connected with a corresponding automatic water sampler 4 with a pipeline. The computer control center 5 is a general computer with a predetermined control program. The circuit connection of the automatic analysis measuring instrument 1, the automatic water sampler 4, the computer control center 5 and the water intake pump 6 and the establishment of the control program are similar to those of the existing online monitoring station. The sampling system is the same and belongs to the prior art, so the present application will not repeat them here. A flowmeter probe 8 is also arranged at the constriction port of the weir flume 7, and the flowmeter probe 8 is connected to the relevant interface of the computer control center 5 with a signal cable, which is consistent with the prior art. Weir flume 7 water outlets link to each other with waste water discharge pipe 3 with pipeline equally.

When the water intake pump 6 is turned on, the waste water flowing through the weir flow tank 7 is pumped into the system, flows into the automatic analysis and measuring instruments 1 and the sample retention tank 2 through the pipeline, fills or renews the sample retention tank 2, and then stops the water intake pump 6 to work , start the automatic analysis and measuring instrument 1 to carry out the determination of each measurement item and send the measurement signal to the computer control center 5 to perform calculation and judgment. The automatic water sampler 4 sends out a signal to extract the same waste water that is retained synchronously from the sample retention tank 2 connected in parallel with the automatic analyzer 1 as a sample for retesting of the reserved sample. After taking the sample, the computer control center 5 restarts the water intake pump 6 to extract waste water from the weir flow tank 7 according to the program. An overflowing water inlet method, which makes the residual liquid in the tank go through a suitable time interval (generally between 60 and 180 seconds) during the flow of waste water, and automatically completes all the waste water stored in the tank. Updated for the next round of analytical assays.

The present invention's synchronous sampling-sample retention system can be an integrated system that only adopts a water intake pump 6 to supply each automatic analysis measuring instrument 1 and sample retention tank 2, or it can be a discrete system composed of two subsystems as shown in the accompanying drawing. In addition to the computer control center 5 shared by each subsystem, the rest of the water intake pump 6, the automatic analyzer 1 and the automatic water sampler 4 form an independent system, and one subsystem is responsible for the analysis of COD and TOC Determination and sampling - sample retention, another subsystem is responsible for PH value and conventional five parameters, ammonia nitrogen and total nitrogen, chloride ammonia, ammonia ion, permanganate, total phosphorus, fluoride, chloride, nitrate, UV Analytical determination and sample retention of other parameters such as organic matter, copper, alkalinity or turbidity - sampling. At the same time, the synchronous sampling-sample retention system of the present invention can also be composed of more than two subsystems, and each subsystem is respectively responsible for the analysis and measurement of one or some parameters and the sampling-retention sample.

In order to prevent the influence of the pipeline of the system itself on the measurement, especially the pipeline made of chlorine-containing polyvinyl chloride (including rigid polyvinyl chloride), its chloride ions will dissolve in the industrial waste water of strong acid and alkali, the system of the present invention The tubing in the tube is made of chlorine-free plastic, such as polyethylene, polypropylene or PPR (polypropylene random).

Claims (3)

1. A wastewater online monitoring synchronous sampling-sample retention system, including a water intake pump, an automatic analyzer, an automatic water sampler, and a computer control center, characterized in that: there are sample retention tanks equal to the number of automatic analyzers Each sample retention tank is connected in parallel with a pipeline for an automatic analysis and measuring instrument between the water intake pump and the waste water outlet pipeline, and each automatic water sampler is connected with a corresponding pipeline for the sample retention tank. 2. The wastewater online monitoring synchronous sampling-sample retention system according to claim 1 is characterized in that: the system is a whole that is connected correspondingly with each parallel automatic analysis measuring instrument and the sample retention tank by a pipeline for a water intake pump or a split system consisting of at least two independent subsystems that are connected correspondingly to the pipelines for the water intake pump, the parallel automatic analyzer and the sample retention tank. 3. The wastewater online monitoring synchronous sampling-sample retention system according to claim 1 or 2, which is characterized in that: the connecting pipeline in the system is a chlorine-free polyethylene pipe, a chlorine-free polypropylene pipe Tube or chlorine-free PPR random copolymer polypropylene tube.

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