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Electrochemical method for removing nitrate from drinking water source

An electrochemical and nitrate technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Easy to operate, save secondary processing costs, and reduce costs

Inactive Publication Date: 2012-06-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, due to the ubiquitous generation of by-products such as nitrite and ammonia during the reduction and removal of nitrate by the electrochemical method, additional pollution has been caused, and there has been no effective solution so far, which limits the practical application of the electrochemical method.

Method used

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  • Electrochemical method for removing nitrate from drinking water source
  • Electrochemical method for removing nitrate from drinking water source
  • Electrochemical method for removing nitrate from drinking water source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 In the shown device, the electrolytic cell is a cylindrical water tank with a volume of 500mL, made of polyethylene, the cathode is Cu / Zn (Cu: 62.2wt%; Zn: 37.8wt%) linear electrode, and the anode is Ti / Zn. Pt-IrO 2 For the wire electrode, a DC voltage stabilizer is used as the power supply, the effective voltage is 0-50V, and the effective current is 0-5A. The volume of nitrate solution for each electrolysis is 400mL, and the effective use area of ​​the electrode is 50cm 2 .

[0047] In the experiment, artificially synthesized nitrate polluted water (NO 3 - -N, 50mg / L; Na 2 SO 4 ; 0.5g / L, NaCl0.5g / L) 400mL is put into the electrolyzer, turn on the power, adjust the electric current, make the electric current density be 40mA / cm 2 . After 5 hours of reaction, the concentration of nitrate nitrogen in the effluent was 6.5mg / L; neither nitrite nor ammonia nitrogen was detected, which met the national drinking water standard.

Embodiment 2

[0049] The method for removing nitrate in water is as in Example 1, but the concentration of nitrate nitrogen in the groundwater increases to 100mg / L. After 5 hours of reaction, the concentration of nitrate nitrogen in the effluent is 9.7mg / L; neither nitrite nor ammonia nitrogen is detected, which meets the requirements of the national standard. drinking water standards.

Embodiment 3

[0051] Such as figure 2 and image 3 As shown, the electrolytic cell (reactor) is a 2cm x 13cm x 5.2cm=135.2cm 3 The cuboid water tank is made of polyethylene, the cathode is Cu / Zn (Cu: 62.2wt%; Zn: 37.8wt%) plate electrode, and the anode is Ti / Pt-IrO 2 Plate electrode, the cathode is placed in the center of the electrolytic cell, and the anode is placed on both sides of the cathode. A DC voltage regulator is used as the power supply with an effective voltage of 0-50V and an effective current of 0-5A. The volume of nitrate solution for each electrolysis is 1L, and the effective use area of ​​the electrode is 10cm x 13cm=130cm 2 . During the electrolysis process, the liquid is circulated between the circulation tank and the reactor through the circulation pump.

[0052] In the experiment, artificially synthesized nitrate polluted water (NO 3 - -N, 25mg / L; Na 2 SO 4 ; 0.5g / L, NaCl0.5g / L) 1L is put into the circulation tank, turn on the power supply, adjust the current ...

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Abstract

The invention relates to an electrochemical method for removing nitrate from a drinking water source. In the invention, the method comprises a step of electrolyzing the water to be treated for 1 to 5 hours at a current density of between 10 and 50 mA / cm<2> by using an electrode containing Fe, Ti, Al, Pd, Cu, Zn, Sn, Cu / Zn, Cu / Pd or Ti / Pd as a cathode and using an insoluble electrode containing Pt, Ir, Ru, Pd or Pb as an anode in an electrolytic bath. The method of the invention also comprises a step of adding an ionic compound of chlorine in the electrolytic process. The electrochemical method reduces the cost of the electrochemical reduction of the nitrate and improves the treatment efficiency, so the practicability of removing the nitrate from the drinking water by the electrochemical method is improved.

Description

technical field [0001] The invention belongs to the application field of water treatment technology, and in particular relates to a method for electrochemically removing nitrate in drinking water sources. Background technique [0002] Currently, groundwater in many countries is polluted by varying degrees of nitrates. In some parts of Europe, nitrate pollution reached serious levels 30 years ago and continues to grow. In my country, groundwater nitrate pollution is also ubiquitous, especially in densely populated and high-yielding areas. In the early 1980s, the groundwater of some cities in my country was polluted by nitrates. The monitoring data of 41 cities showed that 1 / 3 of the cities had nitrate pollution in the groundwater at that time, and the pollution was very serious in some areas. Drinking groundwater with high nitrate content will cause harm to human health. The harm of nitrate to the human body is mainly caused by its reduction to nitrite in the human body. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/461
Inventor 冯传平李淼郭旭
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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