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Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources through continuous operation of magnesium-air battery

An anaerobic digestion and air battery technology, applied in anaerobic digestion treatment, chemical instruments and methods, separation methods, etc., can solve problems such as large power consumption, reduce operating costs, stabilize power generation capacity, and ensure reaction efficiency. Effect

Pending Publication Date: 2022-04-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical method can form struvite precipitation without introducing other impurity ions, but the process consumes a lot of electric energy

Method used

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  • Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources through continuous operation of magnesium-air battery
  • Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources through continuous operation of magnesium-air battery
  • Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources through continuous operation of magnesium-air battery

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Embodiment

[0040] Such as Figure 1 to Figure 5 As shown, the magnesium-air battery in this embodiment is a device for continuously operating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources, including a cathode chamber A, an anode chamber B, external connection equipment and a support frame 2, and the cathode chamber A and anode chamber B are Hollow chamber, the hollow chamber where the cation exchange membrane 16 is located is located in the middle of the cathode chamber A and the anode chamber B, the junction of the chamber and the chamber is provided with a sealing ring 20, all the chambers are surrounded by screw holes 19, connected by The bolts 12 are connected in series, and the shell fixing screws 9 are fixed at both ends of the connecting bolts 12; the cathode chamber A is connected with a waste water circulation system including anaerobic digestion liquid inlet 1-1, water inlet pipe 1-2, 90° elbow 1-3, circulation Pump 1-4, connecting pipe 1-5, li...

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Abstract

The invention discloses a device and a method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources through continuous operation of a magnesium-air battery, an air electrode and a magnesium electrode are adopted as a cathode and an anode respectively, the anaerobic digestion wastewater is added into a cathode chamber, and a sodium chloride solution is added into an anode chamber to serve as electrolyte; and the negative chamber and the positive chamber are separated by a cation exchange membrane and are connected through an external lead. The potential difference enables the magnesium anode to lose electrons, and generated magnesium ions penetrate through the cation exchange membrane to react with ammonium radicals and phosphate in the anolyte to generate struvite; electrons reach an air electrode through an external wire, and oxygen in the air is subjected to electron reaction to generate OH <->; positive ions such as magnesium ions in the battery penetrate through the cation exchange membrane to form a loop, and 1.3 V open-circuit voltage can be generated in an external circuit. According to the method, the magnesium ions generated by the magnesium electrode in situ are used as the phosphorus removal agent, nitrogen and phosphorus removal of the wastewater is realized on the premise of not introducing other impurity ions, and meanwhile, nitrogen and phosphorus resources and electric energy in the wastewater can be recycled.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a device and method for continuously operating a magnesium-air battery to treat anaerobic digestion wastewater and recover nitrogen and phosphorus resources. Background technique [0002] Nitrogen and phosphorus are indispensable elements in organisms and the basis for the survival of all organisms. There is a shortage of nitrogen and phosphorus resources in the world today, and if the large amount of nitrogen and phosphorus contained in wastewater is not removed in time, it will cause eutrophication of the water body. Therefore, the removal and recovery of nitrogen and phosphorus in wastewater has become a current research hotspot. There are many ways to remove nitrogen and phosphorus from wastewater: biological method, chemical precipitation method and electrochemical method. The traditional biological method transfers the phosphorus in the wastewater to the sludge, and con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/463C02F1/469C01B25/45C02F101/10C02F101/16C02F101/12C02F3/28
Inventor 王茹董婷婷张海涵
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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