Method and device for detecting COD (chemical oxygen demand) of water body through synergy of ozone and ultraviolet

An ozone and ultraviolet technology, applied in the direction of testing water, material inspection products, etc., can solve the problems of large chloride concentration, serious secondary pollution, long digestion time, etc., and achieve accurate and reliable results, low cost, simple and convenient operation. Effect

Active Publication Date: 2014-02-12
JIANGNAN UNIV
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Problems solved by technology

Although the national standard method has high accuracy and good reproducibility, it takes a long time to digest, is greatly affected by the concentration of chlorides, high cost, and serious secondary pollution

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  • Method and device for detecting COD (chemical oxygen demand) of water body through synergy of ozone and ultraviolet
  • Method and device for detecting COD (chemical oxygen demand) of water body through synergy of ozone and ultraviolet
  • Method and device for detecting COD (chemical oxygen demand) of water body through synergy of ozone and ultraviolet

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] The invention utilizes the advanced oxidation technology of ozone and ultraviolet. When ozone is irradiated by ultraviolet light with a wavelength of less than 310nm, free oxygen radicals (·O) are generated, and ·O reacts with water to generate highly oxidizing hydroxyl radicals (·OH ), and its reaction formula is:

[0023] O 3 → UV ( λ 310 nm ) · O + O 2 · O ...

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Abstract

The invention provides a method and a device for detecting the COD (chemical oxygen demand) of a water body through the synergy of ozone and ultraviolet. The method and the device have the advantages that the COD of the water body is detected by utilizing an ozone-ultraviolet-synergic advanced oxidation technique based on an oxygen consumption difference value theory, so that various organic matters in the water body can be rapidly and thoroughly oxidized and digested within a short time, and the oxidation efficiency is high; the whole measurement process can be automatically controlled by utilizing an automatic technique, and the method and the device are particularly suitable for the online detection of the chemical oxygen demand in environmental water quality online monitoring systems; no chemical reagent is added in the whole oxidative digestion process, so that the secondary pollution is avoided; the measurement method is simple, is easy to understand, is insensitive to the influence of chloride and is accurate and reliable in result; the measurement on chemical oxygen demand can be continuously carried out by only consuming the water energy and the electric energy, so that the cost is low.

Description

technical field [0001] The invention relates to the technical field of water quality detection, in particular to a method and device for detecting water body COD with ozone and ultraviolet rays. Background technique [0002] COD content (chemical oxygen demand) reflects the degree of water body pollution by organic matter, and is one of the important indicators for comprehensive evaluation of water body pollution degree. The eutrophication of lakes and reservoirs is becoming more and more serious, which is closely related to the COD content in the water. Excessive COD content in water bodies will cause abnormal reproduction and growth of various aquatic plants. Large-scale cyanobacteria outbreaks have occurred in Taihu Lake, Chaohu Lake and other places. Therefore, it has important practical significance for the detection of COD content in water. [0003] At present, the detection method of COD content in water mainly adopts the national standard potassium dichromate oxida...

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Application Information

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IPC IPC(8): G01N33/18
Inventor 杨慧中张龙薛佩姣胡惠新陈刚
Owner JIANGNAN UNIV
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