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Method for improving denitrification of integrated vertical flow constructed wetlands

A technology of constructed wetland and vertical flow, applied in chemical instruments and methods, aerobic and anaerobic process treatment, sustainable biological treatment, etc., can solve problems such as insufficient carbon source and poor total nitrogen removal effect

Active Publication Date: 2015-01-07
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention introduces the new structure formed by introducing the anaerobic biological cathode into the composite vertical flow constructed wetland and applies it to the denitrification of sewage. In addition to the heterotrophic biological denitrification in the IVCW, it can also increase the denitrification achieved by the anaerobic biological cathode. Electrochemical autotrophic biological denitrification to improve the total nitrogen removal rate can solve the problems of insufficient carbon source and poor total nitrogen removal effect when IVCW treats low-carbon and high-nitrogen sewage to a certain extent

Method used

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  • Method for improving denitrification of integrated vertical flow constructed wetlands
  • Method for improving denitrification of integrated vertical flow constructed wetlands
  • Method for improving denitrification of integrated vertical flow constructed wetlands

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Embodiment 1

[0054] Attached below Figure 1-5 The present invention is further described.

[0055] according to figure 1 It can be seen that a method for improving denitrification of composite vertical flow constructed wetlands includes: downflow pool 1, upflow pool 2, sewage inlet pipe 3, sewage cloth distribution pipe 4, wetland plant A5, wetland plant B6, filler C7, filler B8 , filler A9, wetland plant root system 10, wetland internal partition wall 11, filler D12, filler E13, water outlet pipe 14, air hole 15, cathode collector 16, sealing plug 17, sealing cover 18, connecting wire 19, load 20, anode Collector 21, total depth of filler in the downflow pool H1, total depth of filler in the upflow pool H2, conductive filler layer (anode area) h1 on the surface of the downflow pool, ordinary filler layer in the middle layer of the downflow pool h2, bottom connecting layer of the downflow and upflow pools h3, ordinary filler layer in the middle layer of the upflow pool h4, conductive fi...

Embodiment 2

[0057] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0058] A method for improving the denitrification effect of a composite vertical flow constructed wetland, the steps of which are:

[0059] Ⅰ. Sewage enters the sewage distribution pipe 4 on the filler surface of the downflow pool 1 from the sewage inlet pipe 3, and the sewage entering the sewage distribution pipe 4 first enters the surface layer of the downflow pool filled with conductive filler C7 to conduct electricity from top to bottom. Packing layer (anode area) h1. The wetland plant A5 and the wetland plant B6 are planted in the middle of the filler C7 (so that most of the plant root system 10 is in the middle of the filler C), one end of the anode collector 21 is fixed between the wetland plant roots 10, and the other end of the anode collector 21 extends out of the downstream The conductive filler layer (anode region) h1 on the surface of the pool is connect...

Embodiment 3

[0074] Adopt the structure and method in the present invention to deeply purify the sewage treated by secondary aerobic bioreactor (such as membrane bioreactor, aerobic activated sludge method, aerobic fluidized bed method, etc.), the characteristics of sewage are: 1) This type of sewage often has low COD content and high nitrate content, 2) The main water quality index is COD Cr =24~40mg / L, NO 3 - -N=8~18mg / L, NH 3 + -N=3.2-4.6mg / L, TN=11~20mg / L, TP=0.9-1.1mg / L, COD Cr / NO 3 - -N=2~3. The steps of the method are the same as in Example 2, and the specific structural parameters are shown in Table 1 (N-IVCW), and the hydraulic load is maintained at 300mm / d.

[0075] The specific structural parameters of the composite vertical flow constructed wetland with the conventional structure and method used for comparison are shown in Table 1 (C-IVCW), and the hydraulic load is also maintained at 300mm / d.

[0076] Experimental results show that:

[0077] 1) The N-IVCW using the m...

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Abstract

The invention discloses a method for improving denitrification of integrated vertical flow constructed wetlands. The method for improving the denitrification of the integrated vertical flow constructed wetlands comprises the steps that (I) waste water enters a surface conductive filler layer and a middle nonconductive filler layer of a downstream pool in sequence, and ammonia nitrogen in the waste water is oxidized and becomes nitrate nitrogen under the action of the aerobic denitrifying bacteria and nitrifying bacteria; (II) the waste water obtained through the step (I) enters a communication layer of the downstream pool, a communication layer of an upstream pool, a middle nonconductive filler layer of the upstream pool in sequence, and the nitrate nitrogen in the waste water is reduced to nitrogen through a heterotrophic mode under the action of nitrate reductase, nitrite reductase, nitric oxide reductase and nitrous oxide reductase; (III) the water obtained through the step (II) enters a surface conductive filler layer of the upstream pool, and the nitrate nitrogen in the waste water is reduced to nitrogen through a heterotrophic mode under the action of electrochemical autotrophic denitrification; (IV) the denitrified waste water obtained through the step (III) finally flows out through water outlet collecting pipes. The method is simple and convenient to operate and capable of obviously improving the denitrification effect of the integrated vertical flow constructed wetlands.

Description

technical field [0001] The invention belongs to the field of water treatment technology and new energy, and specifically relates to a method for improving the denitrification effect of a composite vertical flow constructed wetland, and in particular to the application of a microbial fuel cell biocathode in enhancing the purification efficiency of constructed wetland ecological engineering technology. Background technique [0002] Composite Vertical Flow Constructed Wetland (IVCW) technology (ZL00114693.9) forms an alternating functional layer of aerobic-anoxic-anaerobic-anoxic-aerobic on the water flow route with a unique downward-horizontal-upward series structure The gradient distribution of physical and chemical biological conditions such as oxygen, pH, and microorganisms has been realized, and there are rich microbial communities in three different functional layers of aerobic A area / anoxic and anaerobic area / aerobic B area formed sequentially along the water flow directi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F3/30
CPCY02W10/10Y02W10/37
Inventor 吴振斌肖恩荣贺锋周巧红徐栋
Owner INST OF AQUATIC LIFE ACAD SINICA
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