Nitrogen-containing sewage treatment process and device for synchronously producing electricity and recovering nitrogen element

A sewage treatment and sewage technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, infiltration/dialysis water/sewage treatment, etc., can solve the problems of pollution, loss of nitrogen fertilizer resources, etc. The effect of low operating cost and simple structure

Inactive Publication Date: 2012-03-14
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conventional denitrification technology has effectively alleviated the current problem of nitrogen pollution in water bodies, it has also caused a large loss of nitrogen fertilizer resources. If the nitrogen in sewage can be recovered, a large amount of energy will be saved

Method used

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  • Nitrogen-containing sewage treatment process and device for synchronously producing electricity and recovering nitrogen element
  • Nitrogen-containing sewage treatment process and device for synchronously producing electricity and recovering nitrogen element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] Embodiment 1: Device installation

[0025] device according to figure 1 The schematic diagram shown is installed: the cation exchange membrane 3 and the anion exchange membrane 4 divide the device into an anode chamber I, a recovery chamber II and a cathode chamber III, wherein the cation exchange membrane 3 and the anion exchange membrane 4 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 I as the anode 2, and placed in the cathode chamber III A carbon cloth with a thickness of 0.1-0.2 mm is used as the cathode 6, and the anode 2 and the cathode 6 are distributed and enriched with electrogenic microorganisms 1 and aerobic microorganisms 5 with a thickness of 40-60 μm, all of which are domesticated from digested sludge of domestic sewage treatment plants; The anode 2 and the cathode 6 are connected by a wire and a...

Embodiment approach 2

[0026] Embodiment 2: device operation

[0027] After the installation of the device is completed, in the anode chamber I of the bioelectrochemical system, biochemically treatable nitrogen-containing wastewater is added from the water inlet a to make it in an anaerobic state where the dissolved oxygen concentration is lower than 0.2mg / L. The pollutants in the wastewater are The electrogenic microorganisms 1 are decomposed, and the electrons released by the decomposed pollutants are transferred to the anode 2, and the treated sewage is discharged from the water outlet b; in the cathode chamber III, the same biochemically treatable containing For nitrogen wastewater, the air enters the cathode chamber III through the aeration pipe 7, so that the dissolved oxygen concentration is greater than 1.5 mg / L, and the nitrogen in the reduced state is oxidized to nitrate ions by the aerobic microorganisms 5, and the treated sewage is discharged from the water outlet h discharge. The anode...

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Abstract

The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen-containing sewage treatment process and device for synchronously producing electricity and recovering a nitrogen element. The device comprises a bioelectrochemical system and a membrane distillation system, wherein the bioelectrochemical system comprises six parts, namely a positive electrode chamber, a positive membrane, a recovery chamber, a negative membrane, a negative electrode chamber, an outer circuit. The process comprises the following steps: entering nitrogen-containing sewage into the positive electrode chamber, carrying out microorganism anaerobic decomposition on pollutants and transferring electrons to a positive electrode, and further transferring the electrons to a negative electrode through the outer circuit so as to achieve electricity production; entering the nitrogen-containing sewage into the negative chamber for aerobic treatment, thus converting ammonia nitrogen into nitrate nitrogen; respectively entering ammonium radical in the positive electrode chamber and nitrate radical in the negative electrode chamber into the recovery chamber through the positivemembrane and the negative membrane under the driving of potential difference; and treating water in the recovery chamber with the membrane distillation system, and refluxing percolate to the recoverychamber, wherein a concentrated liquid is a solution containing high-concentration ammonium nitrate and the like, thereby achieving the recovery of the nitrogen element. The process provided by the invention is simple and has high efficiency and good economic benefits; and the treatment device is simple in structure, and is convenient for practical application.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen-containing sewage treatment process and device for synchronous electricity generation and nitrogen recovery. Background technique [0002] With the increase of population, the continuous improvement of industrialization and urbanization, a large amount of nitrogen enters the water body, eutrophication of the water body, and the deterioration of the ecological environment. For this reason, researchers have developed many biological, chemical or physical technologies to treat sewage The ammonium, nitrate or organic nitrogen in the sewage is converted into nitrogen gas to finally remove the nitrogen in the sewage. Nitrogen is an essential element for biological growth, but most organisms can only absorb nitrate or ammonium nitrogen. Therefore, nitrogen in large quantities in the air needs to be artificially synthesized into ammonia under high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14H01M8/16C02F3/30C02F1/44
CPCY02E60/50Y02P70/50
Inventor 肖勇赵峰
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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