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Method for removing nitrates from water

A nitrate and water removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reaction efficiency and the difficulty of removing nitrate radicals, achieve structural optimization, and avoid secondary pollution. , the effect of simple device structure

Inactive Publication Date: 2010-05-12
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Method for removing nitrates from water
  • Method for removing nitrates from water
  • Method for removing nitrates from water

Examples

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example 1

[0026] 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:

[0027] Electrode: anode: graphite electrode plate 350*180*40, 5 pieces

[0028] Cathode: carbon fiber plate 350*180*5, 6 pieces

[0029] Electrode spacing: 2mm

[0030] Current intensity: 1.0mA

[0031] Voltage: 2.0V

[0032] Temperature: 20-25°C

[0033] Flow: 20L / h

[0034] The water quality after treatment is:

[0035] NO 2 - Less than 0.003mg / L, NO 3 - 0.05mg / L, the removal rate is 99.8%.

example 2

[0036] 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:

[0037] Electrode: anode: graphite electrode plate 350*180*40, 5 pieces

[0038] Cathode: carbon fiber plate 350*180*5, 6 pieces

[0039] Electrode spacing: 2mm

[0040] Current intensity: 1.0mA

[0041] Voltage: 2.0V

[0042] Temperature: 20-25°C

[0043] Flow: 20L / h

[0044] The water quality after treatment is:

[0045] NO 2 - Less than 0.01mg / L, NO 3 - 0.12mg / L, the removal rate is 99.8%.

[0046] The above examples prove that the method can efficiently remove nitrate in water, and the practical effect is very good.

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Abstract

The invention discloses a method for removing nitrates from water, which is characterized in that: a catalytic reduction unit and an electrolysis unit cooperate; the CO2 generated at the anode of the electrolysis unit is used to adjust the pH value of inlet water; the hydrogen generated at the cathode of the electrolysis unit is used as a reductant; a water flow and the hydrogen are allowed to pass through a catalytic reduction reaction area in a mode of reverse flows; the retention time of the water flow and the hydrogen is prolonged; and the nitrates in water are reduced into nitrogen in the presence of a catalyst such as a supported metal Pd or metals Pd-Cu. The anode of the electrolysis unit is made of a graphite plate and the cathode of the electrolysis unit is made of a carbon fiber plate. The method has the advantages that: nitrate-containing raw water can be continuously treated without any additional medicaments or reagents; the process is performed automatically after power is turned on; the products of electrolysis are reasonably arranged and utilized; the related device is simple in process, optimized in structure, high in treatment efficiency and convenient in use.

Description

technical field [0001] The invention relates to the technical field of water treatment technology and equipment, in particular to a method for removing nitrate in groundwater. 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 congenital heart defect syndrome in infants and is al...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/70C02F101/16
Inventor 汪昆平郭劲松蒋绍阶王涛
Owner CHONGQING UNIV