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Method and device for removing nitrates from drinking water

A technology for nitrate and drinking water, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of low hydrogen solubility and low hydrogen utilization rate, and reduce the difficulty of treatment and solve the problem of Effects of excess nitrate, avoiding excess electron donors and microbial overgrowth

Inactive Publication Date: 2011-07-20
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solubility of hydrogen in water is small, and the utilization rate of hydrogen is low

Method used

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  • Method and device for removing nitrates from drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 Shown includes a reactor body 13 with an inner diameter of 12.5 cm and a height of 14 cm, a separation diffusion layer 3, a positive electrode 10 and a negative electrode 11, wherein the separation diffusion layer 3 is installed in the reactor body 13 to separate the reactor body 13 into a denitrification unit 1 and the upper and lower parts of the oxygen pressure unit 2, the denitrification unit 1 and the oxygen pressure unit 2 are respectively filled with filling particles, and the positive electrode 10 and the negative electrode 11 are respectively located in the denitrification unit 1 and the oxygen pressure unit 2. on the grain; the denitrification unit 1 is respectively provided with a first water inlet 4, a first water outlet 5, a sampling port 6 and an exhaust port 7; the anaerobic unit 2 is respectively provided with a second water inlet 8 and Second water outlet 9. The water inlet and outlet are respectively located on both sides of the axial...

Embodiment 2

[0025] The difference from Example 1 is: the volume ratio of the denitrification unit to the anaerobic fermentation unit is 2:1; the denitrification unit is filled with activated carbon particles with a particle size of 2-5mm, accounting for 40% of the denitrification unit volume; The fermentation unit is filled with activated carbon particles with a particle size of 2-5mm, accounting for 60% of the volume of the anaerobic fermentation unit; the separation and diffusion layer is 2cm thick, composed of quartz sand with a particle size of 1.0-3.0mm and artificial cotton with a particle size of less than 0.1mm. The porosity is 60%; the ratio of the surface area of ​​the positive and negative electrodes is 2:1, and the positive and negative electrodes are activated carbon fibers, weighing 20 and 10 g respectively. The positive and negative electrodes are connected to an external resistor through a titanium wire. The added concentration of rice husk powder in the anaerobic fermenta...

Embodiment 3

[0027] The difference from Example 1 is: the volume ratio of the denitrification unit to the anaerobic fermentation unit is 3:1; the denitrification unit is filled with activated carbon particles with a particle size of 2-5mm, accounting for 50% of the denitrification unit volume; The fermentation unit is filled with activated carbon particles with a particle size of 2-5mm, accounting for 60% of the volume of the anaerobic fermentation unit; the separation and diffusion layer is 3cm thick, composed of quartz sand with a particle size of 1.0-3.0mm and artificial cotton with a particle size of less than 0.1mm. The porosity is 70%; the ratio of the surface area of ​​the positive and negative electrodes is 2:1. The positive and negative electrodes are activated carbon fibers, weighing 20 and 10 g respectively. The positive and negative electrodes are connected to an external resistor through a titanium wire. The added concentration of rice husk powder in the anaerobic fermentation...

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Abstract

The invention relates to environmental protection, in particular to a method and a device for removing nitrates from drinking water. The method comprises the following steps that: organic micromolecules generated by the anaerobic digestion of strains in an anaerobic fermentation unit permeate through a separating diffusion layer and are diffused to enter a denitrification unit to serve as a reducing agent for strains subjected to habituated culture in the denitrification unit, namely an electron donor source, wherein for 30 to 50 mg / L of NO3<->-N nitrates at the temperature of between 20 and 25 DEG C, water is cut for 24 to 36 hours; and voltage difference between the denitrification unit and the anaerobic fermentation unit forms microbial current through activated carbon fibers, and the microbial current is transmitted to the denitrification unit from the anaerobic fermentation unit to promote bio-electrochemical denitrification, so that heterotrophic denitrification and bio-electrochemical denitrification are synchronously and synergetically to remove the nitrates from the drinking water. By the method and the device, an electron dornor is prevented from being excessive, and theproblem that the nitrates in the drinking water exceed the standard is solved economically and reliably. The method is suitable for removing the nitrates in the drinking water in large scale and is also suitable for the in-situ treatment of the nitrate pollution in a drinking water source.

Description

technical field [0001] The invention relates to environmental protection, in particular to a method and device for removing nitrate in drinking water. Background technique [0002] Excessive nitrogen application in agricultural production and pollution from livestock and poultry breeding have resulted in serious excess of nitrate in drinking water in many parts of China. Drinking water with excessive nitrates directly endangers the health of infants and pregnant women; for ordinary adults, drinking water with excessive nitrates for a long time can lead to the occurrence of various diseases such as gastric cancer. Therefore, it is of great significance to solve the problem of excessive nitrate in drinking water. [0003] The methods of removing nitrate in drinking water mainly include ion exchange method, reverse osmosis method, chemical method, biological denitrification method and so on. Among them, ion exchange and reverse osmosis are expensive, and the waste water forme...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
Inventor 黄斌史奕陈欣
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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