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Method for determining chemical oxygen demand of electrolyzed high chlorine waste water

A technology for chemical oxygen demand and high-chlorine wastewater, applied in the field of detection, can solve the problem of low COD results and achieve the effect of reducing the impact

Inactive Publication Date: 2016-10-26
SUZHOU INDAL TECH RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology can help measure how much harmful substances are produced during decomposition processes used in various industries such as food production or manufacture. By reducing the impact caused by excessive amounts of nitrogen oxides (NOx) released from these sources into waterways, this technology helps prevent damage that could be done against fisheries worldwide.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to accurately determine how much bacteria and other microorganisms can break down harmful substances such as pesticides used during agricultural production processes.

Method used

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  • Method for determining chemical oxygen demand of electrolyzed high chlorine waste water
  • Method for determining chemical oxygen demand of electrolyzed high chlorine waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The method for measuring the chemical oxygen demand of high chlorine wastewater after electrolytic treatment comprises the following steps in turn:

[0018] 1) Take the water sample to be tested or the diluted water sample to be tested into a closed container. Wherein, high-chlorine wastewater refers to wastewater with a chloride ion concentration of 2,000-20,000 mg / L or diluted wastewater. The free residual chlorine contained in the high chlorine wastewater will interfere with the determination of chemical oxygen demand. Free residual chlorine means that the water sample to be tested contains hypochlorous acid, hypochlorite, elemental chlorine gas or a mixture of two or more of the above components.

[0019] 2) Adjust the pH value of the sample to below 3 with concentrated sulfuric acid.

[0020] 3) Aerate the water sample, the aeration flow rate is 1-3L / min, and the aeration time is 0.5-1min / 10ml. That is, the aeration flow rate can be 1, 2 or 3 L / min, and the rela...

Embodiment 2

[0024] In this embodiment, the COD is measured with the effluent A with high chlorine content of an electrolysis process.

[0025] The method for measuring the chemical oxygen demand of high chlorine wastewater after electrolytic treatment comprises the following steps in turn:

[0026] 1) Take 100mL of the water sample to be tested or the diluted water sample to be tested into a closed container.

[0027] 2) Adjust the pH of the sample to below 3 with concentrated sulfuric acid (ρ(H2SO4)=1.84g / mL, the same below).

[0028] 3) Use nitrogen as the gas source, use the aeration sand head to aerate the water sample, the aeration flow rate is 1L / min, the relationship between the aeration time t and the volume L of the water sample to be tested is: t=L×1min / 10ml . At the same time, a vacuum pump is used to evacuate the container to ensure that the pressure in the container is 0.05 MPa.

[0029] 4) If the pH of the water sample returns to above 3 during the aeration process, repea...

Embodiment 3

[0032] In this embodiment, the COD is measured with the effluent A with high chlorine content of an electrolysis process.

[0033] The method for measuring the chemical oxygen demand of high chlorine wastewater after electrolytic treatment comprises the following steps in turn:

[0034] 1) Take 100mL water sample into a closed container.

[0035] 2) Add concentrated sulfuric acid (ρ(H2SO4)=1.84g / mL) dropwise until the pH is less than 3.

[0036] 3) Connect the air pump of the aeration pipe, connect the aeration sand head to the aeration pipe, put the aeration sand head into the water sample, and turn on the power of the air pump to start aeration. The aeration gas is nitrogen, and the flow rate is adjusted at about 2L / min. The relationship between the aeration time t and the volume L of the water sample to be tested is: t=L×0.5min / 10ml. During this process, a vacuum pump is used to evacuate the inside of the container to ensure that the pressure in the container is 0.06 MPa...

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Abstract

The invention discloses a method for determining a chemical oxygen demand of electrolyzed high chlorine waste water. The method successively comprises the following steps of: collecting a water sample to be detected or a diluted water sample to be detected, and placing the water sample to be detected into a closed vessel, and adjusting the pH value of the sample to be less than 3 by using concentrated sulfuric acid; aerating the water sample, vacuumizing the water sample by using a vacuum pump, ensuring a display pressure value of a pressure meter to be 0.05MPa to 0.07MPa, wherein the aeration flow rate is 1 to 3 L/min, the relationship between an aeration time t and a volume L of the water sample to be detected is as follows: t=L*(0.5 to 1) min/10ml, and maintaining the pH value to be less than 3; and stopping the aeration, taking the water sample as a sample, and analyzing the sample according to the high-chlorine wastewater-determination of chemical oxygen demand-chlorine emendation method (HJ/T-70-2001). The method has the advantages that the chlorine gas generated by hypochlorous acid can be reduced, and low determination result of the chemical oxygen demand (COD) caused by the chlorine gas can be avoided.

Description

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Claims

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Application Information

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Owner SUZHOU INDAL TECH RES INST OF ZHEJIANG UNIV
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