US 2017/0107137 A1 · RESOURCE REUSE-TYPE INDUSTRIAL WASTE WATER TREATMENT METHOD AND APPARATUS UTILIZING OXIDIZING AGENT GENERATED BY UTILIZING WASTE WATER

Abstract

This invention relates to a resource-recycling type method and apparatus for treating industrial wastewater using an oxidizing agent produced from wastewater, wherein, in the treatment of industrial wastewater containing nitrogen compounds and refractory COD-causing pollutants, an oxidizing agent is autonomously produced using ammonia gas stripped from wastewater and is then added back to the wastewater, thus economically treating the wastewater without the need to purchase an expensive oxidizing agent. This wastewater treatment method, suitable for use in decreasing amounts of nitrogen pollutants (T-N), including ethanolamine compounds and ammonia nitrogen (NH3—N), and refractory COD-causing pollutants in industrial wastewater, includes: stripping ammonia from raw wastewater, producing an oxidizing agent via addition of sulfuric acid to the stripped ammonia, electrolysis and addition of sodium hydroxide, and performing chemical treatment by adding the produced oxidizing agent back to the raw wastewater from which ammonia was stripped, thus removing the nitrogen pollutants (T-N) and the refractory COD-causing pollutants, and the apparatus used to perform the wastewater treatment method is also provided.

Claims15

Dependent claims

A resource-recycling-type method of treating industrial wastewater using an oxidizing agent produced from wastewater, suitable for use in decreasing amounts of a nitrogen pollutant (T-N), including an ethanolamine compound and ammonia nitrogen (NH3—N), and a refractory COD (Chemical Oxygen Demand)-causing pollutant in industrial wastewater, comprising:

stripping ammonia from raw wastewater;
producing sodium persulfate in a manner in which the stripped ammonia is placed in a scrubber and added with a sulfuric acid solution diluted to 5 to 50 wt % to thus recover ammonium sulfate concentrated to 5 to 45 wt %, after which the recovered ammonium sulfate and a sulfuric acid solution are fed into an electrochemical conversion unit comprising a diaphragm-type electrical reactor having an ion exchange membrane to produce ammonium persulfate, after which the produced ammonium persulfate is allowed to react with sodium hydroxide in a reaction chamber;
and
performing chemical treatment in a manner in which the produced sodium persulfate is added back to the raw wastewater from which ammonia was stripped, thus removing the nitrogen pollutant (T-N) and the refractory COD-causing pollutant.

1 more element

A resource-recycling-type apparatus for treating industrial wastewater using an oxidizing agent produced from wastewater, suitable for use in decreasing amounts of a nitrogen pollutant (T-N), including an ethanolamine compound and ammonia nitrogen (NH3—N), and a refractory COD-causing pollutant in industrial wastewater, comprising:

a gas-stripping unit for stripping ammonia from raw wastewater;
a sodium persulfate production unit, comprising a scrubber configured such that ammonia stripped from the raw wastewater is allowed to react with a sulfuric acid solution diluted to 5 to 50 wt % to thus recover ammonium sulfate concentrated to 5 to 45 wt %, an electrochemical conversion unit comprising a diaphragm-type electrical reactor having an ion exchange membrane and configured such that the recovered ammonium sulfate is electrochemically reacted and thus converted into ammonium persulfate, and a chemical reaction chamber configured such that the ammonium persulfate thus produced is allowed to react with sodium hydroxide to produce sodium persulfate;
and
a chemical reaction unit configured such that the raw wastewater, from which ammonia was stripped using the gas-stripping unit, and the sodium persulfate produced using the sodium persulfate production unit are allowed to react so as to remove a nitrogen pollutant (T-N) and a refractory COD-causing pollutant.

1 more element

Dependencies are inferred from the claim text.

Resource reuse-type industrial waste water treatment method and apparatus utilizing oxidizing agent generated by utilizing waste water

Life of this patent

Resource reuse-type industrial waste water treatment method and apparatus utilizing oxidizing agent generated by utilizing waste water

Life of this patent

Abstract

Claims15