Method and device for utilizing sewage containing ammonia and sodium

Abstract

The invention discloses a method and device for utilizing sewage containing ammonia and sodium. The method comprises the steps of deamination reaction, denitrification reaction, gas-liquid separation, triple-effect multistage evaporation, evaprative crystallization and freezing crystallization, electrodialysis and sodium filteration membrane, and concentration of reverse osmosis membrane, so that distilled water and membrane deion pure water are recovered, and the resource utilization of sole sodium chloride and sodium sulfate is realized.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method and equipment for utilizing ammonia-containing and sodium-containing waste water resources. Background technique [0002] With the development of modern industry, the shortage of water resources has become increasingly prominent. At the same time, sewage contains a large amount of residual ammonia nitrogen and various sodium ions. Sodium-containing wastewater is generally NACL, NASO4. In order to save water resources, industrial wastewater needs to be reused, so that To ensure the sustainable supply and demand of fresh water resources, most of the existing sewage treatment is treated by dosing method, using acid and alkali neutralization, which will add a lot of excess metal ions. The disadvantage of using dosing method to treat water resources is that it will destroy the ecological balance. In addition, the separation and extraction of ammonia technology is adopted. The ...

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Problems solved by technology

[0002] With the development of modern industry, the shortage of water resources has become increasingly prominent. At the same time, sewage contains a large amount of residual ammonia nitrogen and various sodium ions. Sodium-containing wastewater is generally NACL, NASO4. In order to save water resources, industrial wastewater needs to be reused, so that To ensure the sustainable supply and demand of fresh water resources, most of the existing sewage treatment is treated by dosing method, using acid and alkali neutralization, which will add a lot of excess metal ions. The disadvantage of using dosing method to treat water resources is that it will destroy the ecological balance. In addition, the separation and extraction of ammonia technology is adopted. The separation and extraction of ammonia has the disadvantage of large residual ammonia nitrogen wastewater, and the residual ammonia nitrogen content is maintained at 8ppm-15ppm. To completely separate ammonia, a second denitrification is required.

[0003] The existing ammonia removal process also uses the method of evaporating wastewater. The ammonia content of evaporative condensed water is 30ppm-70ppm. The ammonium ions in the wastewater are removed by evaporating sodium-containing and ammonia-containing wastewater. What is obtained is a mixture of sodium ions, which can only be mixed. Sodium salt product, cannot get single sodium salt

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