Method for determining chlorine demand for rapid reaction in chlorine residual decay after chlorination

A technology for the attenuation and determination of residual chlorine, which is applied in the direction of testing water, material inspection products, etc., can solve the problem of not being able to obtain residual chlorine demand, and achieve the effect of wide application range, simple steps, and less consumables

Inactive Publication Date: 2012-10-03
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this analysis method can quickly measure the residual chlorine content of the sample in the device, it can monitor the residual chlorine in drinking water and industrial circulating cooling water on-line in real time, and obtain instant analysis data easily and quickly, but it cannot obtain the rapid decay of residual chlorine. Chlorine demand for reaction

Method used

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  • Method for determining chlorine demand for rapid reaction in chlorine residual decay after chlorination
  • Method for determining chlorine demand for rapid reaction in chlorine residual decay after chlorination
  • Method for determining chlorine demand for rapid reaction in chlorine residual decay after chlorination

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1) Add the filtered water from the water plant into the brown bottle, place the brown bottle in a constant temperature box, keep the temperature at 19°C, measure the water temperature with a thermometer every 20 minutes, until the temperature reaches a stable level, and obtain pretreated water;

[0040] 2) Use a clean beaker to measure 100ml of pure water, and use a 1ml pipette to add a sodium hypochlorite aqueous solution with a free chlorine weight percentage of 10% to the pure water to prepare a sodium hypochlorite aqueous solution with a sodium hypochlorite concentration of 500mg / L;

[0041] 3) Add the sodium hypochlorite aqueous solution with a sodium hypochlorite concentration of 500 mg / L in step 2) to the pretreated water in step 1), and prepare the total initial residual chlorine concentration C 0 1.6mg / L disinfection water;

[0042] 4) Take the disinfected water in step 3) and measure the residual chlorine concentration C (mg / L) at different times t. Different ...

Embodiment 2

[0048] In step 4), the different times t are 5min, 10min, 15min, 25min, 35min, 65min, 95min, 125min, 155min, 185min, 215min, 245min, 305min, 365min, 425min after adding the sodium hypochlorite aqueous solution. Example 1 is the same.

[0049] Fitting x, k by least square method f and k s Three parameters, simulated curves such as figure 2 As shown, get x, k f and k s , x=0.334,k f =8.019,k s =0.039, correlation coefficient R 2 =0.9901, combine x=0.334 with C 0 =1.6mg / L multiplied, and then multiplied by the adjustment factor 1.15 is the quick reaction chlorine demand, which is 0.615mg / L.

[0050] Such as figure 1 and figure 2 Shown, the data collection in embodiment 1 is 28h from adding sodium hypochlorite aqueous solution, and the data collection in embodiment 2 is 425min from adding sodium hypochlorite aqueous solution, and the quick reaction chlorine demand that both obtains The difference between the results is 0.04mg / L, and the result data of the two tests ar...

Embodiment 3

[0052] In step 3), prepare the total initial residual chlorine concentration C 0 is 1.13mg / L disinfection treatment water, in step 4), different time t is 5min, 10min, 15min, 25min, 35min, 65min, 110min, 140min, 170min, 200min, 230min, 290min, 350min, 410min, 470min, and the rest of the steps are the same as in Example 1.

[0053] Fitting x, k by least square method f and k s Three parameters, simulated curves such as image 3 As shown, get x, k f and k s , x=0.503,k f =6.355,k s =0.066, correlation coefficient R 2 =0.9922, put x=0.503 and C 0 =1.13mg / L multiplied, and then multiplied by the adjustment factor 1.15 is the quick reaction chlorine demand, which is 0.654mg / L.

[0054] Such as figure 1 , figure 2 and image 3 Shown, the quick reaction chlorine demand 0.655mg / L in embodiment 1, the quick reaction chlorine demand 0.615mg / L among the embodiment 2 are basically consistent with the quick reaction chlorine demand 0.654mg / L in embodiment 3, visible , so the ...

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Abstract

The invention discloses a method for determining chlorine demand for rapid reaction in chlorine residual decay after chlorination, which comprises the following steps of: 1) adding sodium hypochlorite into water needing disinfection to prepare disinfected water with the total initial residual chlorine concentration C0 of 1.1mg / L-1.7mg / L; 2) taking the disinfected water in step 1), measuring the residual chlorine concentration C at different time t, fitting data by a formulary parallel first-order reaction model, fitting three parameters of x, kf and ks in a least squares method to obtain x, kf and ks, and multiplying x, C0 and then an adjustment coefficient 1.10-1.20 to obtain the chlorine demand for the rapid reaction. The method disclosed by the invention has the characteristics of low cost and safety, and at the same time the method is simple, has strong operability and good controllability, and is easy for expansion and industrial production. The chlorine demand for the rapid reaction can be determined rapidly and accurately by the method disclosed by the invention, so that accurate chlorination is carried out according to the chlorine demand for the rapid reaction.

Description

technical field [0001] The invention relates to the technical field of chlorination and disinfection of drinking water, in particular to an efficient one-time determination method for fast-response chlorine demand for residual chlorine decay in a pipe network. Background technique [0002] Sodium hypochlorite disinfection is a disinfection method commonly used in water plants in my country. Its advantages are low cost and obvious disinfection effect. The disadvantage is that it decays faster in water with poor water quality. In recent years, due to the deterioration of water source water quality, although the concentration of residual chlorine in the factory water can meet the requirements of more than 0.3mg / L in the Hygienic Standard for Drinking Water (GB5749-2006) after adding chlorine to the clear water pool of the water plant, the residual chlorine decays very slowly. The concentration of residual chlorine in the pipeline is very low, and the concentration of residual c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18
Inventor 虞介泽李聪张土乔张可佳毛欣炜
Owner ZHEJIANG UNIV
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