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Device and method for online measurement of dynamic chlorine demand of conditioning water

A technology for treating water and chlorine demand, which is applied in the direction of oxidation water/sewage treatment, color/spectral characteristic measurement, material analysis by observing the influence of chemical indicators, etc. It can solve the problem of substandard water supply and no consideration of chlorine consumption question

Active Publication Date: 2013-02-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is still a hysteresis adjustment method, which will lead to substandard water supply when the water quality fluctuates abnormally and it is difficult to quickly take adjustment measures due to technical limitations.
In addition, this method only considers substances that can react with chlorine in a short period of time (4-6 minutes) to consume chlorine, but does not consider substances that can react slowly with chlorine to consume chlorine. factory is still at risk

Method used

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  • Device and method for online measurement of dynamic chlorine demand of conditioning water
  • Device and method for online measurement of dynamic chlorine demand of conditioning water
  • Device and method for online measurement of dynamic chlorine demand of conditioning water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] In this example, the effluent from a sedimentation tank of a waterworks plant is taken as the research object, and the inflow flow rate of the water supply plant is 6200m 3 / h, COD of the effluent from the sedimentation tank Mn The value is 2mg / L, ammonia nitrogen is 0.17mg / L, the residence time at the end of the pipe network is 24 hours, and the concentration of available chlorine at the end of the pipe network is required to be 0.05mg / L.

[0078] use as figure 1 The shown equipment for online determination of the dynamic chlorine demand of treated water performs online determination of the dynamic chlorine demand of treated water. The device for on-line determination of the dynamic chlorine demand of treated water includes a four-way retention spectrum unit and an on-line control unit.

[0079] The four-way stop spectrometer unit (structure modeled after the existing stop spectrometer: stopped-flow spectrometer, SX20, Applied physics Co., UK) includes a four-way sam...

Embodiment 2

[0113] In this example, the effluent from a sedimentation tank of a waterworks plant is taken as the research object, and the influent flow rate of the water supply plant is 3800m 3 / h, COD of the effluent from the sedimentation tank Mn The value is 2.5mg / L, ammonia nitrogen is 0.21mg / L, the residence time at the end of the pipe network is 30 hours, and the concentration of available chlorine at the end of the pipe network is required to be 0.05mg / L.

[0114] Utilize the equipment of the on-line determination treatment water dynamic chlorine demand of embodiment 1 to carry out on-line determination treatment water dynamic chlorine demand; The passage sampler has the same volume as the second passage sampler, both 80 μL; the third passage sampler in the four plug-flow type injectors with switching valves is the same as the second passage sampler. The fourth channel injectors have the same volume, 70 μL.

[0115] The above-mentioned equipment for online determination of the dy...

Embodiment 3

[0127] In this example, the effluent from a sedimentation tank of a waterworks plant is taken as the research object, and the inflow flow rate of the water supply plant is 4600m 3 / h, COD of the effluent from the sedimentation tank Mn The value is 1.5mg / L, ammonia nitrogen is 0.14mg / L, the residence time at the end of the pipe network is 24 hours, and the concentration of available chlorine at the end of the pipe network is required to be 0.05mg / L.

[0128] Utilize the equipment of the on-line determination treatment water dynamic chlorine demand of embodiment 1 to carry out on-line determination treatment water dynamic chlorine demand; The passage sampler has the same volume as the second passage sampler, both 100 μL; the third passage sampler in the four push-flow type injectors with switching valves is the same as the second passage sampler. The fourth channel injectors have the same volume, 85 μL.

[0129] The above-mentioned equipment for online determination of the dyn...

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Abstract

The invention belongs to the field of water supply treatment and disinfection, and particularly relates to a device and a method for online measurement of dynamic chlorine demand of conditioning water. The technical scheme disclosed by the invention is that the existing four-way stay spectrometer is improved, and an online control unit is added to form an online stay spectrum device. The method comprises the following steps: accurately measuring the concentration of residual effective chlorine of the chlorine and the conditioning water after a period of time of reaction by the online stay spectrum device on line; dividing reaction of the chlorine and the conditioning water into rapid reaction and slow reaction by linear regression fitting of a logarithmic value and reaction time of the residual effective chlorine; building a calculation formula of short-term chlorine demand on the conditioning water at the rapid reaction stage and long-term chlorine demand on the conditioning water at the slow reaction stage; and calculating the dynamic chlorine demand of the conditioning water according to the demand on a residual chlorine value at the tail end of a pipe network and the stay time, thus the pre-stage control of the fed chlorine can be achieved; the economical efficiency and the security of the fed chlorine are achieved, and water supply security is effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of water supply treatment and disinfection, in particular to an equipment and method for online determination of the dynamic chlorine demand of treated water. Background technique [0002] Disinfection is an essential link in the drinking water treatment process and the last barrier to ensure the safety of drinking water. Chlorine or hypochlorite is still the disinfectant used by most water supply plants in China. The primary goal of disinfection is to achieve the inactivation of pathogenic microorganisms such as Escherichia coli and viruses, and to control the regrowth of microorganisms and the growth of biofilm on the pipe wall during water delivery. In order to ensure the microbial safety of water quality, the dosage of disinfectant should ensure that the end of the pipe network has a certain level of disinfectant, otherwise it may make it difficult to guarantee the microbial safety of the end of the pipe network a...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/78C02F1/76
Inventor 曲久辉田川刘锐平刘会娟兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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