Determination method for chemical oxygen demand of waste water

A technology of chemical oxygen demand and measurement method, which is applied in the field of COD measurement of high-chlorine and low-COD wastewater, and can solve problems such as the inability to measure COD

Inactive Publication Date: 2018-12-21
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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Problems solved by technology

[0006] Compared with the prior art, the method sample of the present invention avoids the problem that COD in the dilute

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  • Determination method for chemical oxygen demand of waste water
  • Determination method for chemical oxygen demand of waste water
  • Determination method for chemical oxygen demand of waste water

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Embodiment Construction

[0007] The assay method of the chemical oxygen demand (COD) of the waste water that the embodiment of the present invention provides, comprises the steps:

[0008] Step A: Mix the wastewater sample with sulfuric acid and heat it in the open to volatilize chloride ions in the form of hydrogen chloride to obtain a water sample with a chloride ion content below 1000 mg / L;

[0009] Step B: The water sample obtained in step A was measured for COD using a closed catalytic digestion method.

[0010] The waste water sample in this embodiment is copper oxide production washing water, basic copper chloride reacts with liquid caustic soda to produce copper oxide, the crude copper oxide is washed with tap water, and the obtained washing water is the copper oxide production washing water. The pH value of the washing water is about 9, the salt content is as high as 30%, has an ammonia smell (ammonia nitrogen is about 200 mg / L), and the chloride ion concentration is as high as 10% or more, a...

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Abstract

The invention provides a determination method for the chemical oxygen demand (COD) of waste water. The determination method includes the steps that step A, a waste water sample and sulfuric acid are mixed in a digestion tube and heated in the open, and chloride ions are volatilized in the form of hydrogen chloride to obtain a water sample with the chloride ion content below 1000mg/L; and Step B, amasking agent, a digesting agent and a catalyst are directly and sequentially added into a mixture of the waste water and the sulfuric acid obtained in step A, and a closed catalytic digestion methodis used for determining the COD. The sample of the method avoids the problem that the COD in the diluted sample is less than the method detection limit and cannot be determined due to the dilution ina traditional method.

Description

technical field [0001] The invention relates to a method for measuring chemical oxygen demand (COD) of waste water, in particular to a method for measuring COD of waste water with high chlorine (1%-13%) and low COD (<300mg / L). Background technique [0002] Wastewater, for example, is derived from the wastewater produced by the reaction of basic copper chloride and liquid caustic soda (the reaction temperature reaches 90°C) to prepare copper oxide. Basic copper chloride is prepared from copper-containing etching waste liquid. The wastewater is colorless and has a pH value of 9 The salt content is as high as 30%, and there is an ammonia smell (ammonia nitrogen is about 200mg / L), and the chloride ion concentration is as high as about 10%, and some reach 13%. The wastewater contains a certain amount of chemical oxygen demand (COD) (<300mg / L), and it needs to be treated to make its COD reach the standard of category IV in Table 1 of GB 3838-2002 "Environmental Quality Stand...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/28
CPCG01N1/28G01N31/16
Inventor 程龙军李钧胡元娟彭娟周健斌
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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