A method for wastewater denitrification based on photoelectric catalysis-autotrophic biofilm

A technology of photoelectric catalysis and treatment method, applied in the fields of energy waste water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The effect of low construction and operation costs, small footprint and low energy consumption

Inactive Publication Date: 2016-10-05
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the other part will be further oxidized into nitrate nitrogen (including nitrate nitrogen and nitrite nitrogen). In the environment lacking formic acid and other hole capture agents, this part of nitrate nitrogen cannot be reduced to nitrogen gas at the cathode, so that nitrate nitrogen will accumulate. , resulting in incomplete removal of nitrogen, affecting the quality of effluent water

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  • A method for wastewater denitrification based on photoelectric catalysis-autotrophic biofilm
  • A method for wastewater denitrification based on photoelectric catalysis-autotrophic biofilm
  • A method for wastewater denitrification based on photoelectric catalysis-autotrophic biofilm

Examples

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Embodiment example 1

[0052] In this embodiment, the ammonia nitrogen concentration in the waste water to be treated is 35 mg / L, and the nitrate nitrogen concentration is 20 mg / L.

[0053] When carrying out denitrification treatment, first adjust the pH of the wastewater to be treated to 8, and then pass it into two reaction chambers, and completely immerse the photoanode and cathode; in addition, for the convenience of comparison, the wastewater passed into the two reaction chambers same amount. Respectively, as for the light conditions in each reaction chamber (the light intensity at a distance of 10 cm from the light source is 90 mW / cm 2 ) and no light conditions, and a working voltage of 3V was applied to the cathode and anode in each reaction chamber, so that the rotating speed of the stirring paddle was 100 rpm.

[0054] Get the ammonia nitrogen concentration and the nitrate nitrogen concentration in the waste water after reacting 12h and analyze, the result is as follows figure 1 As shown,...

Embodiment example 2

[0057] To study the effect of pH value on the denitrification effect of the reaction chamber, the concentration of ammonia nitrogen in the influent is 35mg / L, the concentration of nitrate nitrogen in the influent is 20mg / L, and there is light (the light intensity at a distance of 10cm from the light source is 90mW / cm 2 ), the applied voltage is 3V, and under the reaction conditions of stirring (the rotating speed of the stirring paddle is 100 rpm), the pH value of each reaction chamber is 6, 7, 7.5, 8 and 9. After the reaction was carried out for 12 hours, the concentration of total nitrogen in each reaction chamber was measured respectively.

[0058] The measurement results Figure 4 As shown, it can be seen that the denitrification efficiency of the reaction chamber is not high under acidic and neutral environments; under the weakly alkaline environment with pH values ​​of 7.5 and 8, the denitrification efficiency of the reaction chamber is significantly increased. But when...

Embodiment example 3

[0060] To study the influence of the applied voltage value on the denitrification effect of the reaction chamber, the concentration of ammonia nitrogen in the influent is 35mg / L, the concentration of nitrate nitrogen in the influent is 20mg / L, and there is light (the light intensity at a distance of 10cm from the light source is 90mW / cm 2 ), the pH value is 8, and under the reaction conditions of stirring (the rotating speed of the stirring paddle is 100 rpm), the applied voltages of each reaction chamber are 0, 1, 2 and 3V. After the reaction was carried out to 12h, the concentration of total nitrogen in each reaction chamber was measured respectively, and the measurement results were as follows: Figure 5 shown.

[0061] Depend on Figure 5 It can be seen that when the applied voltage is 0-3V, the denitrification efficiency of the reaction device increases with the increase of the applied voltage, but when it is further increased to 4V, the denitrification efficiency of the...

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Abstract

The invention discloses a wastewater nitrogen removal treatment method based on a photoelectrocatalysis-autotrophic biofilm. The method is that wastewater to be treated is fed into a reaction chamber to be subjected to nitrogen removal treatment; at least part of the reaction chamber is manufactured from a light transmission material; a visible-light response photoanode is arranged in the reaction chamber, and a cathode of an autotrophic denitrifying biofilm develops in the reaction chamber; the pH of the wastewater is regulated to be 7 to 8 during the nitrogen removal treatment, then the wastewater is fed into the reaction chamber, 1 to 3V working voltage is applied across the photoanode and the cathode, the visible light irradiates through the light transmission part of the reaction chamber until the concentration of ammonia nitrogen and the concentration of nitrate nitrogen decrease to reach the set target value, and then the reacted wastewater is drained from the reaction chamber. According to the wastewater nitrogen removal treatment method, the autotrophic biofilm denitrifying and photoelectric catalyzing technologies are carried out, so that the shortage that the ammonia-nitrogen wastewater cannot be treated by the autotrophic biofilm denitrifying technology, and the nitrate-nitrogen wastewater cannot be treated by the photoelectric catalyzing technology can be overcome, and various nitrogen elements can be synchronously removed.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a wastewater denitrification treatment method based on photoelectric catalysis-autotrophic biofilm, which is suitable for the treatment of domestic sewage and industrial wastewater with high nitrogen content and low organic matter content. Background technique [0002] At present, the most commonly used wastewater denitrification process is the aerobic-anaerobic biological denitrification process. Its main disadvantage is that the respiration types of nitrifying bacteria and denitrifying bacteria used are different, so different reaction structures need to be built to create Aerobic and anaerobic environments increase construction costs and land costs; at the same time, the process achieves denitrification by changing the treatment conditions from anaerobic to aerobic and then to facultative oxygen through effluent reflux, which requires a large amount of reflux power , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16
CPCY02W10/37
Inventor 丛燕青许剑佳王齐陈漪静白天虹
Owner ZHEJIANG GONGSHANG UNIVERSITY
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