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Bioelectrochemical denitriding reactor and application method thereof

A bioelectrochemical and reactor technology, applied in the field of wastewater biological treatment, can solve the problems of high energy consumption, slow addition, slow start, etc., and achieve the effect of high current

Active Publication Date: 2012-02-15
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the disadvantages of multiple reactors connected in series, slow start-up, high energy consumption, strict operating conditions, and the need to add carbon sources in the denitrification process in the existing ammonia nitrogen biological removal process, and comprehensively utilizes biological ammonia oxidation and electrode biofilm denitrification Through the bioelectrochemical approach, establish a fully autotrophic bioelectrochemical simultaneous nitrification, denitrification and denitrification reactor for efficient treatment of low carbon nitrogen ratio ammonia nitrogen wastewater and its use method

Method used

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  • Bioelectrochemical denitriding reactor and application method thereof
  • Bioelectrochemical denitriding reactor and application method thereof
  • Bioelectrochemical denitriding reactor and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Electrode Biofilm Acclimatization

[0033] Ammonia oxidation biofilm hanging film: put a 8cmx15cm carbon felt electrode into an independent reactor, inoculate aerobic nitrification sludge, maintain low dissolved oxygen, and dilute a certain concentration of landfill leachate, the initial ammonia nitrogen concentration is 105mg / L, and add 2.0g / L NaHCO 3 , detect changes in the concentration of three nitrogens (ammonia nitrogen, nitrite nitrogen, nitrate nitrogen) every day. When the ammonia nitrogen consumption reaches 5-10 mg / L, change the liquid, reconfigure the ammonia nitrogen wastewater, and add NaHCO 3 , run continuously for 4 weeks until the nitrosation rate reaches 90%, and the ammonium oxidation treatment load stabilizes at 0.1-0.12kg / (m 3 When d), it indicates that the dominant ammonia oxidizing bacteria group has formed, and the ammonia oxidizing biofilm has been established.

[0034] Denitrification biofilm hanging film: put a 8cmx15cm carbon felt ele...

Embodiment 2

[0041] Example 2: The reactor and denitrification method constructed in this example are basically the same as Example 1, except that the initial ammonia nitrogen concentration in the wastewater is 100 mg / L, and the water quality after 3 days of treatment is shown in Table 2.

[0042] The water quality after the treatment of table 2 embodiment 2

[0043]

Embodiment 3

[0044] Example 3: The reactor and denitrification method constructed in this example are basically the same as Example 1, except that the initial ammonia nitrogen concentration in the wastewater is 150 mg / L, and the water quality after 5 days of treatment is shown in Table 3.

[0045] The water quality after the treatment of table 3 embodiment 3

[0046]

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Abstract

The invention belongs to the technical field of biological wastewater treatment, and particularly relates to a bioelectrochemical synchronous nitrification / denitrification denitriding reactor and an application method thereof. The reactor comprises a bed, a biological anode, a biological cathode, a filler, a gas flowmeter, an aerator, an aeration head, a circulating pump and a direct-current stabilized-voltage power supply, wherein the biological cathode and the biological anode are respectively arranged at both sides in the reactor and are respectively connected with the negative pole and the positive pole of the direct-current power supply; the filler is filled in the bed; the aeration head is arranged at the middle upper part of the bed; both ends of the bed are respectively provided with a water inlet and a water outlet and are connected with a circulating pipeline for internal circulation through the circulating pump; and the top of the reactor is provided with a gas outlet through which the reactor is communicated with the outside. The application method of the reactor comprises the following steps: forming an anode ammoxidation biological film and a cathode denitrification biological film, and starting the reactor after the films are successfully formed; carrying out nitrification and denitrification reaction under the condition of 0.2-1.0mg / L of dissolved oxygen; and carrying out denitriding reaction while applying a micro voltage of 0.2-0.5V and keeping a cathode potential of (-100)-(-250)mV. The invention has the advantages of good treatment effect, energy saving, environment friendliness, high start speed, convenient operation process and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, and in particular relates to a reactor for bioelectrochemical synchronous nitrification and denitrification denitrification and a use method thereof. technical background [0002] The rapid development of industry and agriculture brings economic growth, but also causes environmental pollution, among which nitrogen pollution is becoming more and more prominent. Traditional biological denitrification technology includes two stages of nitrification and denitrification. In the nitrification stage, ammonia nitrogen is oxidized to (sub)nitrification nitrogen by autotrophic (sub)nitrifying bacteria under aerobic conditions; in the denitrification stage, nitrite nitrogen and nitrate nitrogen are denitrified by heterotrophic conditions under anaerobic conditions Bacteria reduce nitrogen to nitrogen, thereby achieving denitrification. Due to the specificity of autotrophic bacteria...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 李大平占国强陶勇张礼霞
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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