System and method for realizing wastewater reuse by removing ammonia nitrogen through three-dimensional electrolysis of liquid-solid fluidized bed

Abstract

The invention belongs to the fields of chemical engineering and environmental protection. Specifically, the invention discloses a system and a method for realizing wastewater reuse by removing ammonianitrogen through three-dimensional electrolysis of a liquid-solid fluidized bed. Suspended solids in the ammonia-nitrogen wastewater are removed through gravity settling and filtering, and pre-purification of the wastewater is realized. Through spraying treatment, sufficient mixing of a catalyst and ammonia-nitrogen wastewater is realized, and catalytic components in electrolytic gas are effectively utilized. Efficient cracking of ammonia nitrogen in wastewater is realized through plate frame electrolysis coupled with fluidized bed three-dimensional electrolysis. The acid-base property of theelectrolyzed solution is adjusted by adopting raw water at the outlet of a filter, so that the wastewater is recycled. An integrated bipolar plate structure is adopted in plate frame electrolysis, the material utilization efficiency is improved, meanwhile, a current series connection and water flow parallel connection mode is adopted, water circulation is enhanced, the mass transfer efficiency isimproved, and ammonia nitrogen decomposition is promoted.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and in particular relates to a system and method for three-dimensional electrolytic removal of ammonia nitrogen in a liquid-solid fluidized bed to realize wastewater reuse. Background technique [0002] In 2019, China's GDP reached 99 trillion yuan, an increase of about 58 times compared to 30 years ago. Behind the rapid economic growth, the output of heavy industries such as chemical industry, metallurgy, coal, cement, and caustic soda has exceeded 50% of the world's total. These industries all have the characteristics of high energy consumption and heavy pollution. In other words, nearly 50% of the world's annual pollutant emissions remain in China. A large amount of pollutant discharge far exceeds the self-metabolizing capacity of the environment, leading to ecological imbalance. In order to maintain a benign balance of the ecosystem, it is necessary to artific...

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Problems solved by technology

However, the presence of insulating porous plates will seriously affect the mass transfer of the electrolyte, and the performance of unipolar particle electrodes is generally lower than that of bipolar particle electrodes.

[0005] In summary, the electrocatalytic oxidation process has significant advantages in the treatment of ammonia nitrogen wastewater, but the current technology still has the problems of low mass transfer efficiency and high electrode cost.

The existing three-dimensional electrolysis technology presents significant technical superiority, but there are still some outstanding problems: (1) Fixed-bed three-dimensional electrolysis has particle electrode agglomeration and hardening, which affects the flow of electrolyte, current short circuit, and cell heating.

(2) Fluidized three-dimensional electrolysis has good mass transfer, but the particle electrode is easy to cause wear of the anode catalytic coating

The anode can be protected by adding porous separators or cloth bags, but there is a new problem of restricted anolyte flow

Moreover, the effect of unipolar particle electrodes is generally lower than that of bipolar three-dimensional particle electrodes.

(3) At present, the field of electrocatalytic oxidation treatment of ammonia nitrogen wastewater mainly focuses on the development of electrolytic cells, lacking systematic technology

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