Enhanced denitrification method and device for coupled microorganism electrolytic tank of downstream vertical flow artificial wetland

A technology of microbial electrolytic cell and constructed wetland, which is applied in the field of the device field of downstream vertical flow constructed wetland coupling microbial electrolytic cell to strengthen denitrification, can solve the problems of high construction cost of microbial electrolytic cell, difficulty in popularization and application, high operating cost, etc., and achieve improvement Total nitrogen removal effect, enhanced removal efficiency, and low construction cost

Active Publication Date: 2016-01-06
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, a single microbial electrolysis cell requires high construction costs and high operating costs, making it difficult to promote and apply it on a large scale in China
[0010] At present, there are no reports at home and abroad on the application of MEC to the denitrification of constructed wetlands.

Method used

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  • Enhanced denitrification method and device for coupled microorganism electrolytic tank of downstream vertical flow artificial wetland

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Experimental program
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Effect test

Embodiment 1

[0039] A method for strengthening denitrification with a descending vertical flow constructed wetland coupled with a microbial electrolytic cell, the steps are as follows:

[0040] A. The water is evenly distributed from the top of the system, and the wastewater first flows into the upper non-conductive filler layer 5. This area is in an aerobic state due to the oxygen secretion of the roots of the wetland plants 6 and the dissolved oxygen brought into the water, and most of the ammonia nitrogen Under the action of nitrifying bacteria and nitrosifying bacteria, it is converted into nitrate nitrogen. At the same time, due to the adsorption, retention and oxidation of fillers and microorganisms, most of the organic matter can also be effectively reduced;

[0041] B. Then the waste water flows into the anode conductive filler layer 4, and the unoxidized organic matter can be completely removed in this layer, and the heterotrophic denitrifying bacteria use the organic carbon source...

Embodiment 2

[0047] A device for strengthening denitrification with a downward vertical flow artificial wetland coupled with a microbial electrolytic cell, the device is laid with a bottom non-conductive filler layer 1, a cathode conductive filler layer 2, a non-conductive filler isolation layer 3, an anode conductive filler layer 4, The upper non-conductive filler layer 5 is characterized in that: the cathode conductive filler layer 2 is connected to the bottom non-conductive filler layer 1 and the non-conductive filler isolation layer 3 respectively, and the anode conductive filler layer 4 is connected to the non-conductive filler isolation layer 3 and the upper non-conductive filler layer respectively. The filler layer 5 is connected, and wetland plants 6 are planted in the upper non-conductive filler layer 5. The cathode collector 7 and the anode collector 10 are respectively connected to the negative pole and the positive pole of the DC power supply 8 through wires 9 to form a closed lo...

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Abstract

The invention discloses an enhanced denitrification method and device for a coupled microorganism electrolytic tank of a downstream vertical flow artificial wetland. The enhanced denitrification method comprises the following steps: (A) water is uniformly distributed on the top of a system, and waste water firstly flows into an upper non-conductive filler layer; (B) waste water flows into an anodic conductive filler layer, and unoxidized organic matters are removed in the anodic conductive filler layer; (C) then waste water flows into a non-conductive filler isolating layer which is a separator between a cathodic conductive filler layer and the anodic conductive filler layer; (D) waste water flows into the cathodic conductive filler layer to generate an autotrophic denitrification process; and (E) waste water is drained through a bottom draining pipe. The anodic conductive filler layer is connected with the bottom communication filler layer and the non-conductive filler isolating layer, respectively, the anodic conductive filler layer is connected with the non-conductive filler isolating layer and the upper non-conductive filler layer, respectively, and cathodic and anodic collector electrodes are respectively placed in the cathodic conductive filler layer and the anodic conductive filler layer. The enhanced denitrification method has the beneficial effects that the operation is simple, and the removal efficacy of the downstream vertical flow artificial wetland to low-carbon and high-nitrogen wastewater is substantially improved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for strengthening denitrification by coupling a downward vertical flow artificial wetland with a microbial electrolytic cell, and also relates to a device for strengthening denitrification by coupling a downward vertical flow artificial wetland with a microbial electrolytic cell. Background technique [0002] In China's current water pollution, nitrogen has gradually risen as the main pollutant. A large amount of nitrogen-containing sewage is discharged into water bodies without treatment or incomplete treatment, leading to eutrophication of water bodies. Therefore, the removal of nitrogen is one of the urgent problems in the field of sewage treatment, and the research and application of nitrogen removal technology has attracted widespread attention. In the actual sewage biological denitrification process, only when the C / N ratio is greater than 6 can the deni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/34C02F3/30
CPCY02W10/10
Inventor 吴振斌肖恩荣许丹张义徐栋贺锋周巧红
Owner INST OF AQUATIC LIFE ACAD SINICA
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