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Electrochemical assisted biological denitrification technology

A biological denitrification and electrochemistry technology, applied in the field of environmental biology, can solve the problems of increasing the complexity of system operation and unfavorable promotion and application.

Inactive Publication Date: 2015-11-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, in a system, the oxidation of organic matter at the anode and the denitrification at the cathode and the auxiliary nitrification process must be realized at the same time, which undoubtedly increases the complexity of the system operation and is not conducive to popularization and application.

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  • Electrochemical assisted biological denitrification technology

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Embodiment 1

[0031] The embodiment adopts the attached figure 1 The technical system shown, wherein: the electrochemical assisted biological denitrification reactor is a 2L (35mm×100mm×990mm) square plexiglass container; the cathode and anode electrodes are the same, and are flat graphite electrodes, the electrode size is 5mm×100mm×300mm, and the anode Placed in the center of the reactor, the cathode is installed close to the two side walls of the reactor, the distance between the cathode and the anode is 1cm, and it is arranged in parallel in three sections from top to bottom. Ammonia nitrogen wastewater is prepared by using ammonium chloride in the laboratory, containing about 1000mg / L of ammonia. After the system is assembled, 1800mL of ammonia nitrogen wastewater and 200mL of a certain river sediment are injected into the reactor to form a working volume of 2000mL. according to figure 1 In the connected circuit shown, the electrolysis voltage of 0.8V is provided by a DC stabilized po...

Embodiment 2

[0033] The system constitution of embodiment 2 is identical with technological process with embodiment 1, but concrete operation parameter is different, and difference is:

[0034] (1) Ammonia-nitrogen wastewater is used as the source to separate urine, which is taken from a village-level vacuum source separation system, without any pretreatment before use, and the ammonia content is in the range of 800mg / L to 1500mg / L;

[0035] (2) The temperature of the reactor is not controlled, and the temperature of the source-separated urine is within the range of 15°C to 25°C;

[0036] In Example 2, each treatment cycle is maintained for 25 to 50 days, and the removal rate of ammonia nitrogen in the source-separated urine reaches over 95%.

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Abstract

The present invention provides an electrochemical assisted biological denitrification method, which is suitable for ammonia nitrogen wastewater with C / N of less than 5 or without an organic carbon source. According to the present invention, under an anaerobic condition, microorganisms are inoculated in ammonia nitrogen wastewater, low voltage (0.3-1.2 V) is applied, and the anode ammoxidation reaction and the cathode denitrification reaction are coupled in the same bio-electrochemical system so as to achieve the full autotrophic biological denitrification from ammonia gas to nitrogen gas; and according to the method, the aeration is not required to carry out the traditional nitration reaction, and the carbon source is not required to be additionally added to complete the denitrification.

Description

1. Technical field [0001] The invention belongs to the field of environmental biology technology, and in particular relates to an electrochemical-assisted biological denitrification technology for denitrification treatment of ammonia nitrogen wastewater. 2. Background technology [0002] Nitrogen is a major element that causes eutrophication in water bodies, and nitrogen in water bodies mainly exists in the form of ammonia nitrogen. If ammonia nitrogen wastewater is discharged directly without any treatment, it will seriously threaten ecological security and human health. [0003] The traditional nitrification / denitrification biological denitrification process to treat the above-mentioned high-ammonia nitrogen wastewater has problems such as high aeration energy consumption and alkalinity consumption in the nitrification stage, and the need to add a large amount of organic carbon sources in the denitrification stage, resulting in high treatment costs. Although the new short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
Inventor 曲波郑雅莉胡明朱仕坤范彬
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI