Water treatment process and device for synchronously producing electricity and removing nitrate from underground water

A water treatment device and synchronous treatment technology, applied in the field of water treatment, can solve problems such as high cost and secondary pollution, and achieve the effects of low operating cost, no secondary pollution and high efficiency

Inactive Publication Date: 2012-03-21
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to deal with nitrate pollution in groundwater, researchers have proposed biological methods, chemical catalytic reductio

Method used

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  • Water treatment process and device for synchronously producing electricity and removing nitrate from underground water
  • Water treatment process and device for synchronously producing electricity and removing nitrate from underground water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] Embodiment 1: Device Installation

[0024] device according to figure 1 The principle diagram shown is for installation: the cation exchange membrane 3 and the anion exchange membrane 6 divide the device into an anode chamber A, a cathode chamber B and an underground water chamber C, wherein the cation exchange membrane 3 and the anion exchange membrane 6 adopt a transmittance of 96 % and 94% non-toxic ion-exchange membranes, the thickness is 0.3mm, and the burst strength is ≥0.5MPa; a carbon cloth with a thickness of 0.2-0.3mm is placed in the anode chamber A as the anode 2, and the cathode chamber B is placed A carbon cloth with a thickness of 0.1-0.2 mm is used as the cathode 5, and the anode 2 and the cathode 5 are distributed and enriched with a thickness of 40-60 μm for electrogenic microorganisms 1 and autotrophic denitrifying microorganisms 4, electrogenic microorganisms 1 and autotrophic denitrifying microorganisms 4 They are all domesticated from digested slu...

Embodiment approach 2

[0025] Embodiment 2: device operation

[0026] After the installation of the device is completed, biochemically treatable organic wastewater is added to the MFC anode chamber A to keep the dissolved oxygen concentration at 0.2 mg / L in an anaerobic state, and the pollutants in the wastewater are decomposed under the action of electrogenic microorganisms 1 At the same time, the electrons released by decomposing pollutants are transferred to the anode 2 and further transferred to the cathode 5 through the wire and the external resistor 7; the nitrate-contaminated groundwater with a nitrate nitrogen concentration of 40-60 mg / L is continuously added to the underground water chamber C , due to the presence of an ion gradient with the cathode chamber B, the nitrate ions, carbonate and bicarbonate anions in the groundwater pass through the anion exchange membrane 6 and enter the cathode chamber B, and the autotrophic denitrifying microorganisms 4 on the cathode 5 utilize the transfer o...

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Abstract

The invention belongs to the technical field of water treatment, and in particular relates to a water treatment process and device for synchronously treating sewage, producing electricity and removing nitrate from underground water. The device consists of an anode chamber, a cation exchange membrane, a cathode chamber, an anion exchange membrane, an underground water chamber, an external circuit and the like, wherein the anode chamber and the cathode chamber are respectively used for enriching electricigens and autotrophic denitrification microbes, the electricigens in the anode chamber can decompose electrons generated by pollutants in the sewage, and then the decomposed electrons are transferred to a cathode through an anode and the external circuit; nitrate radical in the underground water chamber enters the cathode chamber through the anion exchange membrane and then is reduced into nitrogen by the autotrophic denitrification microbes, and carbonate and other anions in the underground water can be taken as a carbon source for growth of the autotrophic denitrification microbes; and the cation exchange membrane and the anion exchange membrane have extremely small pore space so as to prevent the underground water from being polluted by the microbes. The water treatment process has the advantages of low energy consumption, high efficiency, low operating cost and no secondary pollution, and is simple and easy for operation; and the device has the advantages of simple structure and convenience for large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a water treatment process and device for synchronously treating sewage, generating electricity and removing groundwater nitrate. Background technique [0002] Groundwater is the water stored in the formation voids below the vadose zone, including rock pores, fissures and caves, and is an important part of water resources. Due to the stable water quantity and good water quality of groundwater, it is not only one of the important water sources for agricultural irrigation and industrial production, but also an important source of drinking water for human beings. According to statistics, about 70% of the population in my country uses groundwater as the main source of drinking water. However, with the development of industry and agriculture, a large amount of nitrogen-containing wastewater is discharged into natural water bodies and enters groundwater, resulting in nitrate pol...

Claims

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Application Information

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IPC IPC(8): C02F3/28H01M8/16
CPCY02E60/50Y02P70/50
Inventor 肖勇赵峰
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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