Electrochemical reactor for processing nitrogenous organic wastewater, and application and processing method thereof

An organic wastewater and electrochemical technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost and unsatisfactory denitrification effect, and achieve strong reducing ability, The selective oxidation ability of ammonia nitrogen is strong, and the effect of strong oxidation ability

Inactive Publication Date: 2013-07-10
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of high cost and unsatisfactory denitrification effect of the existing electrochemical denitrification technology used for treating nitrogen-containing organic wastewater, the present invention provides an electrochemical reactor for treating nitrogen-containing organic wastewater and its application and treatment method. On the premise of ensuring the oxidation effect of the original three-dimensional electrode without increasing energy consumption, the invention selects a cathode with strong denitrification ability, a DSA-type oxide-coated electrode with strong ability to oxidize ammonia nitrogen and COD—Ti / IrO 2 –PtO 2 As the anode, a mixture of activated carbon particles and magnetic particles with similar particle sizes is used as filler, and the device operates intermittently. It is a three-dimensional electrode reactor with intermittent operation that has the ability to efficiently remove nitrate nitrogen, ammonia nitrogen and COD and has low energy consumption.

Method used

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  • Electrochemical reactor for processing nitrogenous organic wastewater, and application and processing method thereof
  • Electrochemical reactor for processing nitrogenous organic wastewater, and application and processing method thereof
  • Electrochemical reactor for processing nitrogenous organic wastewater, and application and processing method thereof

Examples

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Effect test

Embodiment 1

[0042] like figure 1 As shown, an electrochemical reactor for treating nitrogen-containing organic wastewater includes a reaction vessel, a power supply 1, an outlet pipe 2, an outlet pipe, an outlet pipe valve 3 and a water inlet system. The water inlet system consists of a water collector 10, a peristaltic pump 9. The water inlet valve 8 and the water inlet pipe 7 are sequentially connected in sequence; the water inlet pipe 7 is connected to the middle and lower part of the reaction vessel; the air outlet pipe 2 is connected to the top of the reaction vessel; the outlet pipe is connected to the middle and lower part of the reaction The water pipe valve 3 is controlled, and also includes packing 6, cathode plate 11 and anode plate 12, the filler is composed of activated carbon and magnet particles; the cathode plate 11 is connected to the negative pole of the power supply 1; the anode plate 12 is connected to the positive pole of the power supply 1; a cathode plate 11 and an...

Embodiment 2

[0052] With embodiment 1, difference is: the activated carbon particle and the magnet particle ratio are 6:1 in the filler, the average particle diameter of activated carbon particle / magnet particle=120%, will contain nitrate ion concentration and be 30mg / L , the wastewater with a NaCl concentration of 0.5g / L enters the reaction vessel from the water inlet pipe 7 through the peristaltic pump 9, and adjusts the inflow flow so that the hydraulic retention time is 4h, and the applied current density is 20mA / cm 2 , Measure the concentration of nitrate nitrogen in the effluent every 1h. The processing effect is attached image 3 As shown, after 4 hours, the concentration of nitrate nitrogen in the effluent was 1.82mg / L, and the removal rate was 93.93%.

Embodiment 3

[0054] Same as Example 1, the difference is: the ratio of activated carbon particles and magnet particles in the filler is 2:1, the average particle diameter of activated carbon particles / average particle diameter of magnet particles=110%, the ammonia nitrogen concentration will be 60mg / L, NaCl Wastewater with a concentration of 0.5g / L enters the reaction vessel from the water inlet pipe 7 through the peristaltic pump 9, and adjusts the water flow rate so that the hydraulic retention time is 4h and the applied current density is 20mA / cm 2 , Measure the concentration of nitrate nitrogen in the effluent every 1h. The processing effect is attached Figure 4 As shown, after 4 hours, the concentration of ammonia nitrogen in the effluent was 7.12mg / L, and the removal rate was 88.13%.

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Abstract

The invention discloses an electrochemical reactor for processing nitrogenous organic wastewater, and an application and a processing method thereof, and belongs to the field of processing nitrogenous organic wastewater. The device comprises a reaction container, a power supply, a gas outlet pipe, a water outlet pipe, a water outlet pipe valve and a water inlet system, and further comprises a packing material, a negative plate and a positive plate, wherein the packing material is formed by mixing active carbon and magnet particles; the negative plate is connected with the negative electrode of the power supply; the negative plate is a silicon dioxide plate loaded copper-palladium coating electrode, and the coating material consists of Pd and Cu at a mass ratio of 6: 1; and the positive plate is a digital subtraction angiography (DSA) oxide coating electrode Ti/IrO2-PtO2. The reactor is a batch-type operation three-dimensional electrode reactor which adopts a mixture of active carbon particles and magnet particles with similar diameter as the packing material, and has the functions of efficiently removing nitrate nitrogen, ammonia nitrogen and COD (chemical oxygen demand), and is low in energy consumption; and the reactor is capable of achieving a purpose of removing nitrogen and COD in the nitrogenous organic wastewater.

Description

technical field [0001] The invention belongs to the field of nitrogen-containing organic wastewater treatment, and more specifically relates to an electrochemical reactor for treating nitrogen-containing organic wastewater. Background technique [0002] In recent years, due to the use of pesticides and fertilizers, nitrate has become a major pollutant in water bodies. Studies have shown that drinking water with high nitrate content can lead to increased hemoglobin in infants and related cancers in adults. Methods and processes for removing nitrate from water include membrane filtration, ion exchange, biological denitrification, electrochemical denitrification, etc. Among them, electrochemical denitrification has fast denitrification efficiency, good denitrification effect, and no secondary pollution. And it has a certain removal effect on COD, so it has attracted the attention of many researchers. However, the high energy consumption and high operating cost of the electroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/48C02F101/38
Inventor 杨光俊叶忠香夏远芬
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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