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Device for removing nitrate in water
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A nitrate and water removal technology, which is applied in the direction of water pollutants, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of reaction efficiency and difficulty in improving the effect of nitrate removal, and achieve good reaction treatment effect, Reasonable structure setting, no secondary pollution effect
Inactive Publication Date: 2011-06-29
CHONGQING UNIV
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In this invention, the cathode is the place where the nitrate catalytic reduction reaction takes place. Since the cathode is negatively charged, it will produce an electric repulsion effect with the same negatively charged nitrate ions, so that the nitrate is attached to the surface of the cathode catalyst, and then it is connected with the cathode. H produced by electrolysis 2 The chance of catalytic reduction reaction is relatively limited, so the reaction efficiency and the effect of removing nitrate are difficult to improve
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example 1
[0029] Example 1: The volume of the device containing body is 30L, wherein the γ-Al of the palladium-copper bimetal in the catalytic reduction reaction zone 2 o 3 Catalyst particle size 1.0-3.5mm, BET specific surface area 238m 2 / g, Pd 5.1wt%, Cu 1.8wt%, volume 15L, electrolysis zone volume 15L (including electrode volume), the raw water for treatment is prepared by potassium nitrate, concentration 30mg / L, the conditions are as follows:
[0038] NO 2 - Less than 0.003mg / L, NO 3 - 0.05mg / L, the removal rate is 99.8%.
example 2
[0039] Example 2: The volume of the device holding body is 30L, wherein the γ-Al of the palladium-copper bimetal in the catalytic reduction reaction zone 2 o 3 Catalyst particle size 1.0-3.5mm, BET specific surface area 238m 2 / g, Pd 5.1wt%, Cu 1.8wt%, volume 15L, electrolysis zone volume 15L (including electrode volume), the raw water for treatment is prepared by potassium nitrate, concentration 50mg / L, the conditions are as follows:
[0048] NO 2 - Less than 0.01mg / L, NO 3 - 0.12mg / L, the removal rate is 99.8%.
[0049] The device can efficiently remove nitrate in water, and the practical effect is very good.
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Abstract
The invention discloses a device for removing nitrate in water and in particular relates to a device for removing nitrate in water by utilizing an electrolysis unit and a catalyst catalytic reduction unit; the upper part of the device is a catalytic reduction reaction unit and the lower part thereof is the electrolysis unit; the anode of an electrolysis region adopts a graphite plate and the cathode thereof adopts a carbon fiber plate; CO2 generated at the anode is contacted with inflow water to adjust the pH of the inflow water after being connected at the water inlet position by an air pipe; H2 generated at the cathode carries out catalytic reduction reaction with nitrate in water after entering in the catalytic reduction reacting area through an air distribution chamber and an air distribution plate. Water current and H2 pass through a catalytic reaction region in a countercurrent way, and the nitrate in water is restored into nitrogen under the function of the catalysts such as loaded metal Pd or Pd-Cu. The device can continuously treat the source water containing nitrate without adding chemicals and reagent, the treating process can be automatically carried out after the device is powered on, the electrolysis product can be utilized rationally, the structure is rational, the treating efficiency is high and the usage is convenient.
Description
technical field [0001] The invention relates to the technical field of water treatment process equipment, in particular to a device for removing nitrate in groundwater by using an electrolysis unit and a catalytic reduction unit. Background technique [0002] In recent years, with the development of industrial and agricultural production, especially the rapid development of industries such as synthetic chemicals, petrochemicals, pesticides and insecticides, as well as the massive discharge of industrial wastewater and urban sewage, more and more nitrate pollutants have entered the groundwater body. As urban water sources, lakes, rivers and reservoirs are increasingly polluted, and drinking water safety problems caused by nitrates in water have become one of the main factors threatening human health. Nitrate, which is harmful to mammalian organisms, is converted to ammonium in the body, an intermediate step of which is the conversion of nitrate to nitrite. Nitrite may cause...
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