Electrochemical autotrophic denitrification integrated reactor for removing nitrate nitrogen in water

Abstract

The invention discloses an electrochemical autotrophic denitrification integral reactor for removing nitrate nitrogen in water, which comprises a barrel type foaming nickel cathode, a graphite anode, a reactor body, a direct-current power supply, a water outlet, sampling openings, a porous baffle plate and a water inlet, wherein the barrel type foaming nickel cathode is arranged inside the reactor body; the center of the barrel type foaming nickel cathode is provided with the graphite anode; the barrel type foaming nickel cathode and the graphite anode are fixed on the reactor body through the porous baffle plate; the direct-current power supply is connected with the barrel type foaming nickel cathode and the graphite anode; the bottom of the reactor body is provided with the water inlet, and the top of the reactor body is provided with the water outlet; and a plurality of sampling openings are arranged on the side wall of the reactor body. The electrochemical autotrophic denitrification integral reactor can effectively remove nitrate pollutant in ground water or surface water, wherein the removal rate of nitrate can reach more than 70 percent and the content of nitrite is below 0.01 milligram per liter, so as to reach the quality standard for drinking water.

Description

technical field

[0001] The invention relates to the treatment of groundwater and surface water in the field of environmental protection, in particular to an electrochemical autotrophic denitrification integrated reactor for removing nitrate nitrogen from water. Background technique

[0002] The treatment methods of nitrate in groundwater mainly include physical and chemical methods, biological denitrification and chemical denitrification.

[0003] Physicochemical methods mainly include ion exchange, reverse osmosis and electrodialysis.

[0004] Conventional ion exchange processes include anion exchange with chloride ion and bicarbonate ion resins. However, the ion exchange method consumes a large amount of regenerative chemicals, and it will cause secondary pollution when discharged.

[0005] Reverse osmosis can not only remove NO from groundwater 3 - -N, also removes C1 at the same time - , SO 4 2- , Ca 2+ , Mg 2+ etc., are superior to other methods. However, this...

Examples

Embodiment 1

[0026] Implementation Example 1: When the pH is 8, the temperature is 32°C, the current is 15mA, ORP3 - When the ion concentration is 30mg / L, the nitrate concentration in the effluent water is 7.9mg / L, the nitrite concentration is 0.007mg / L, the pH is 8.1, the total nitrogen decreases by 19mg / L, and the ammonia nitrogen concentration has no significant change. The removal efficiency is above 73%. The treated simulated water enters the water storage tank through the water outlet 5 .

Embodiment 2

[0027] Implementation example 2: When the pH is 8, the temperature is 32°C, the current is 15mA, ORP3 - Under the condition of ion concentration of 50mg / L, the microorganisms enriched in the foamed nickel cathode can convert NO 3 - quickly reduced to N 2 , to achieve NO 3 - removal of ions. The removal efficiency is above 71%. The treated simulated water enters the water storage tank through the water outlet 5 .

technical field

[0001] The invention relates to the treatment of groundwater and surface water in the field of environmental protection, in particular to an electrochemical autotrophic denitrification integrated reactor for removing nitrate nitrogen from water. Background technique

[0002] The treatment methods of nitrate in groundwater mainly include physical and chemical methods, biological denitrification and chemical denitrification.

[0003] Physicochemical methods mainly include ion exchange, reverse osmosis and electrodialysis.

[0004] Conventional ion exchange processes include anion exchange with chloride ion and bicarbonate ion resins. However, the ion exchange method consumes a large amount of regenerative chemicals, and it will cause secondary pollution when discharged.

[0005] Reverse osmosis can not only remove NO from groundwater 3 - -N, also removes C1 at the same time - , SO 4 2- , Ca 2+ , Mg 2+ etc., are superior to other methods. However, this...

Examples

Embodiment 1

[0026] Implementation Example 1: When the pH is 8, the temperature is 32°C, the current is 15mA, ORP3 - When the ion concentration is 30mg / L, the nitrate concentration in the effluent water is 7.9mg / L, the nitrite concentration is 0.007mg / L, the pH is 8.1, the total nitrogen decreases by 19mg / L, and the ammonia nitrogen concentration has no significant change. The removal efficiency is above 73%. The treated simulated water enters the water storage tank through the water outlet 5 .

Embodiment 2

[0027] Implementation example 2: When the pH is 8, the temperature is 32°C, the current is 15mA, ORP3 - Under the condition of ion concentration of 50mg / L, the microorganisms enriched in the foamed nickel cathode can convert NO 3 - quickly reduced to N 2 , to achieve NO 3 - removal of ions. The removal efficiency is above 71%. The treated simulated water enters the water storage tank through the water outlet 5 .

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