Method for recovering nitrate nitrogen in wastewater by electrochemical ammoniation of microorganisms

A technology of microbial electrochemistry and nitrate nitrogen, applied in chemical instruments and methods, biological water/sewage treatment, electrochemical and biological combined treatment, etc., to achieve the effects of low cost, strong environmental adaptability, and low energy consumption

Active Publication Date: 2019-09-06
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To solve this problem, it is necessary to develop a new method to obtain a large number of DNRA functional microorganisms, but there are no relevant records and reports so far.

Method used

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  • Method for recovering nitrate nitrogen in wastewater by electrochemical ammoniation of microorganisms
  • Method for recovering nitrate nitrogen in wastewater by electrochemical ammoniation of microorganisms
  • Method for recovering nitrate nitrogen in wastewater by electrochemical ammoniation of microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: A method for the ammonization of nitrate using a bioelectrochemical system with an external resistance of 10Ω and a carbon-to-nitrogen ratio of 8

[0027] The invention provides a method for recovering nitrogen from nitrate wastewater by combining microbial electrochemical ammonification with microbial electrolysis. Since the bioelectrochemical system can enrich and domesticate more electroactive microorganisms with DNRA function, applying the DNRA process to the bioelectrochemical system can significantly improve its DNRA efficiency. The reactor was started and acclimated under the condition of 10Ω external resistance, and the DNRA process under this condition was explored by adding wastewater containing 3.2mM nitrate. The specific steps are as follows:

[0028] A bioelectrochemical system is constructed in sewage, and the domestication method is a microbial fuel cell method. The carbon fiber brush is used as the anode, the activated carbon air cathode is u...

Embodiment 2

[0029] Example 2: A method for the ammonization of nitrate using a bioelectrochemical system with an external resistance of 100Ω and a carbon-to-nitrogen ratio of 8

[0030] As the external resistance increases, the electrical activity of the biofilm gradually decreases, the content of electrogenic bacteria gradually decreases, the DNRA process will gradually weaken, and the denitrification process will gradually increase. Add 3.2mM nitrate to explore the DNRA process under this condition, the specific steps are as follows:

[0031] A kind of utilization bioelectrochemical system described in embodiment 1 is the method for nitrate ammonification under 10Ω external resistance and carbon-nitrogen ratio is 8 conditions, and difference is:

[0032] The fixed value resistor connected between the two poles is 100Ω. Its ammonization efficiency is as image 3 shown. image 3 The results show that the nitrate is completely degraded within 8-14 hours, and its ammonium conversion effi...

Embodiment 3

[0033] Example 3: A method for ammonizing nitrate using a bioelectrochemical system with an external resistance of 10Ω and a carbon-to-nitrogen ratio of 0.5

[0034] As the nitrate content increases, the carbon-to-nitrogen ratio gradually decreases. Since denitrifying bacteria are more sensitive to nitrate than DNRA bacteria, they grow faster at low carbon-nitrogen ratios, resulting in the proportion of DNRA bacteria in the microbial community. Decrease gradually, denitrifying bacteria gradually increase, thus reducing the reactor DNRA efficiency. The reactor was started and acclimatized under the condition of 10Ω external resistance, and the DNRA process under this condition was explored by adding 44.2mM nitrate. The specific steps are as follows:

[0035] A kind of method utilizing bioelectrochemical system described in Example 1 to ammonify nitrate under 10Ω external resistance condition, difference is:

[0036] The carbon-to-nitrogen ratio of the wastewater is 0.5, and th...

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Abstract

The invention discloses a method for converting nitrate nitrogen in wastewater into ammonium nitrogen (which is named as electrochemical ammoniation of microorganisms) in situ by using electroactive microorganisms and coupling a method for recovering ammonium nitrogen by microbial electrolysis. An electron donor is an organic matter in wastewater. The electroactive microorganisms can be obtained by domestication in a microbiological fuel cell or a electrolytic cell reactor. The method has an ammonia recovery effect on nitrate-containing wastewater having a carbon-to-nitrogen ratio of 0.5-8. The beneficial effects of the method are that energy and bacteria in the wastewater are utilized in situ to directly convert nitrate nitrogen into ammonia nitrogen and stripped for recovery to realize the energy recovery of the wastewater and the sustainable utilization of nitrogen.

Description

technical field [0001] The invention relates to the technical field of nitrogen recovery in waste water treatment, in particular to a process of reducing nitrate nitrogen to ammonium (DNRA) using electroactive microorganisms to convert nitrate nitrogen in waste water into ammonium nitrogen that can be easily absorbed and utilized by plants, and coupled with The ammonium concentration is carried out in the microbial electrolytic cell, and the ammonia recovery technology is finally used in the high-efficiency ammonia nitrogen circulation stripping device. Background technique [0002] Reactive nitrogen, as an important nutrient element, widely exists in nature. The emergence of the Haber method in 1908 brought good news to the agricultural production of human society, strengthened agricultural production, and alleviated the food shortage problem faced by the world at that time. The Food and Agriculture Organization of the United Nations has calculated that the global nitrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/34C02F9/14C01C1/02C02F101/16C02F101/30
CPCC01C1/02C02F1/20C02F3/005C02F3/34C02F9/00C02F2101/16C02F2101/30C02F2201/461C02F2201/46135C02F2305/06
Inventor 王鑫黄宗亮万雨轩李楠
Owner NANKAI UNIV
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