System and method for treating ammonia-nitrogen wastewater through liquid-solid fluidized bed three-dimensional electrocatalytic oxidation

Abstract

The invention belongs to the fields of chemical engineering and environmental protection. Specifically, the invention discloses a system and a method for treating ammonia-nitrogen wastewater through liquid-solid fluidized bed three-dimensional electrocatalytic oxidation. Suspended solids in the ammonia-nitrogen wastewater are removed through gravity settling and filtering, and pre-purification of the wastewater is achieved. Through spraying treatment, the catalyst and the ammonia-nitrogen wastewater are fully mixed, and catalytic components in electrolytic gas are effectively utilized. And efficient cracking of ammonia nitrogen in the wastewater is realized through plate and frame electrolysis coupled fluidized bed three-dimensional electrolysis. The acid-base property of water is adjusted by adding medicaments, so that up-to-standard discharge is realized and a three-dimensional electrode diaphragm structure is adopted in plate frame electrolysis, the reaction area is greatly increased by adding graphite felts and carbon felts, and meanwhile, the water circulation is enhanced, the mass transfer efficiency is improved, and the decomposition of ammonia nitrogen is promoted by adopting a current series connection and water flow parallel connection mode.

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 electrocatalytic oxidation treatment of ammonia nitrogen wastewater in a liquid-solid fluidized bed. 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. In order to maintain a benign balance of the ecosystem, it is necessary to artificially and compulsively deal with pollutants. The ammonia nitrogen wastewater involved in this patent is a very typical class of pollutants. [0003] Ammonia nitrogen wastewater widely exists in many industrial fields, including textile, pharmaceutical, pesticide, leather, petroleum, chemical, coal, metallurgy and o...

AI Technical Summary

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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