Water quality on-line monitoring method and system

A monitoring system and water quality technology, applied in the direction of testing water, instruments, and analyzing materials through chemical reactions, can solve the problems of lower measurement accuracy, long response time, and long time, so as to improve measurement accuracy and reduce measurement costs , to avoid the effect of cross-contamination

Active Publication Date: 2008-10-29
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each reagent requires a solenoid valve to control, so that when there are many kinds of reaction reagents, the connection and switching control of the flow path are very complicated, and it is difficult to realize multiple monitoring indicators on the same instrument, resulting in insufficient expansion functions
[0006] 2. The structure is complex, using multiple solenoid valves connected to each reagent, and the reaction and measurement between the tested water sample and the reagent are placed in two devices.
[0007] 3. Due to the existence of dead volume inside the solenoid valve and connecting devices, various reagents are

Method used

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  • Water quality on-line monitoring method and system
  • Water quality on-line monitoring method and system

Examples

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Effect test

Embodiment 1

[0050] Such as figure 2 As shown, an online water quality monitoring system is used to measure ammonia nitrogen and COD in water samples. The monitoring system includes a syringe pump 1, a liquid storage ring 3, a multi-channel directional valve 4, and a reaction-detection unit.

[0051] One end of the syringe pump 1 is connected to the liquid storage ring 3 , and the volume of the liquid storage ring 3 is larger than that of the syringe pump 1 .

[0052] The multi-channel selector valve 4 has a sampling channel, a reagent channel connected to various reagents, an air channel d, an analysis channel o, a common channel connected to the liquid storage ring 3, a calibration channel connected to the calibration solution, and a waste channel f. The reagents include a shielding agent and a color developer for measuring ammonia nitrogen, a catalyst and an oxidant for measuring COD, and the calibration liquid is ammonia nitrogen standard liquid, COD standard liquid, ammonia nitrogen...

Embodiment 2

[0087] Such as image 3 Shown, a kind of water quality on-line monitoring system, is used for measuring ammonia nitrogen, COD in the water sample, and embodiment 1 difference is:

[0088] 1. Install a high pressure resistant second solenoid valve 11 between the reaction-detection chamber 6 and the analysis channel o.

[0089] 2. Use plunger pump 2 instead of syringe pump 1.

[0090] 3. A microwave heating device is installed on the reaction-detection chamber 6 to replace the original electric heating device.

[0091] This embodiment also discloses a water quality online monitoring method, comprising the following steps:

[0092] a, the multi-channel selector valve 4 selects the sampling channel e and the reagent channel n respectively, and then the plunger pump 2 draws the water sample to be measured and the part of the reagent used for measuring COD ( Mercury sulfate, potassium dichromate solution);

[0093] b. The multi-channel selector valve 4 selects the analysis chann...

Embodiment 3

[0121] Such as Figure 4 Shown, a kind of water quality on-line monitoring system is used for measuring ammonia nitrogen, COD in the water sample, and embodiment 2 is different:

[0122] 1. Air passages are no longer provided on the multi-channel directional valve 4 .

[0123] 2. One end of the plunger pump 2 is connected to a three-way valve 15, and a channel 12 of the three-way valve 15 is connected to the outside world as an air channel; one end of the liquid storage ring 3 is connected to the three-way valve 15.

[0124] This embodiment also discloses a water quality online monitoring method, comprising the following steps:

[0125] a, the multi-channel selector valve 4 selects the sampling channel e and the reagent channel n respectively, and then the plunger pump 2 draws the water sample to be measured and the part of the reagent used for measuring COD ( Mercury sulfate, potassium dichromate solution);

[0126] b. The multi-channel selector valve 4 selects the analysi...

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Abstract

The invention discloses a water quality online monitoring system which comprises a pump, a liquid storing unit, a reacting-detecting unit and a multi-pass direction selecting valve. The multi-pass direction selecting valve is provided with a sample introducing passage, a reagent passage, an analytical passage and a common passage communicating with the liquid storing unit; the reacting-detecting unit is composed of a light source, a reacting-detecting chamber, a detector and an analytical device; one end of the reacting-detecting chamber communicates with the analytical passage, and the other end is connected with a valve. The invention further discloses a water quality online detecting method. The monitoring system has the advantages of simple structure, high measurement accuracy and high response speed. Furthermore, the system can measure a plurality of parameters in a water sample, and can be widely applied to the online monitoring of water quality of various water sources, such as domestic sewage, industrial sewage, stream water, river water, etc.

Description

technical field [0001] The invention relates to water quality analysis, in particular to a water quality online monitoring method and system. Background technique [0002] In the wet chemical analysis methods of ammonia nitrogen and chemical oxygen demand stipulated in national standards, it is necessary to add a certain amount of various chemical reagents to the sample for reaction, and then perform quantitative determination by volumetric or spectrophotometric methods. [0003] Such as figure 1 As shown, a water quality online monitoring system produced by Systea Company in Italy, the water sample to be tested, various reagents, standard liquid, and zero liquid are respectively connected to the peristaltic pump through the valve, and the peristaltic pump is connected to the reaction chamber, the measurement chamber, and the measurement chamber in turn. One end is connected to the outside world. The light emitted by the light source passes through the mixed liquid in the ...

Claims

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Application Information

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IPC IPC(8): G01N21/75G01N33/18G01N35/00G01N35/08
Inventor 项光宏韩双来王健
Owner FOCUSED PHOTONICS
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