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Method and apparatus for reducing nitrate radical in water to nitrite radical

A technology of nitrite and nitrate, applied in the direction of reduced water/sewage treatment, color/spectral characteristic measurement, etc., can solve the problems of short life of the reduction device, cumbersome operation, complicated device preparation method, etc., and achieve fast reduction process and production Simple process and high reduction efficiency

Inactive Publication Date: 2011-06-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the preparation method of the device in their reduction method is relatively complicated, and the life of the reduction device is short. In addition, under the premise of providing water samples, the device needs to adjust the pH when docking with the digestion device, which is cumbersome to operate.

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  • Method and apparatus for reducing nitrate radical in water to nitrite radical
  • Method and apparatus for reducing nitrate radical in water to nitrite radical
  • Method and apparatus for reducing nitrate radical in water to nitrite radical

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Embodiment Construction

[0028] this invention figure 1 The figure shows that the six-way valve in the reduction device is in the emptying mode. When the ammonia-free water, dilute hydrochloric acid or the solution to be reduced in the cadmium reduction column needs to be discharged from the cadmium reduction column, the six-way valve needs to be rotated to the emptying mode. At this time, the flow direction of the solution in the cadmium reduction column is from top to bottom as follows: figure 1 As shown; when it is necessary to inject ammonia-free water, dilute hydrochloric acid or the solution to be reduced into the cadmium reduction column, in order to fill the cadmium reduction column, the six-way valve needs to be rotated to the working liquid inlet mode. At this time, the solution in the cadmium reduction column flow direction is bottom-up as figure 2 shown. In actual application according to figure 1 The peristaltic pump 1 is directly connected with the six-way valve 2 with a polytetraflu...

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Abstract

The invention provides a method for reducing nitrate radical in water to nitrite radical. The method is characterized in that a solution containing the nitrate radical is conveyed to a six-way valve after being absorbed by a peristaltic pump; the six-way valve is connected with a cadmium reduction column; and the nitrate radical in the solution is deoxidized to nitrite radical in the cadmium reduction column. The invention has the advantages that both the peristaltic pump and the six-way valve are controlled by a computer; via a compiled program, the peristaltic pump can be started or shut down, the speed of the pump can be changed, and a rotor of the six-way valve rotates, thereby realizing automatic control of reduction, cleaning and activation of the whole method; the cadmium reductioncolumn filled with cadmium filings has high reduction efficiency and long service life and is not influenced by water matrix. The cadmium reduction column has the advantages of simple manufacturing process, large contact area with a water sample, rapid, simple and convenient and efficient reduction process and the like.

Description

technical field [0001] The invention relates to a method and a simple device for reducing nitrate in water to nitrite, which are suitable for the online simple and rapid determination of nitrate or total nitrogen in water when water samples are provided, and belong to the technical field of environmental monitoring. Or supporting equipment technology field. Background technique [0002] At present, water eutrophication caused by nitrogen pollution in water has become an important part of marine pollution, so online monitoring of nitrogen in water has become one of the development trends of marine environmental monitoring technology. Due to the complex components in water, the direct determination of nitrate in water by UV spectrophotometry will cause a lot of interference. After the reagent develops color, its content is determined by spectrophotometry in the range of visible light. In recent years, there have been reports at home and abroad on the reduction process of nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70G01N21/33
Inventor 魏福祥傅晓文
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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