2 results about "Thiocyanate ion" patented technology

The application discloses a method for improving electrochemical carbon dioxide reduction to produce methane under acidic conditions of a copper-based catalyst by using potassium thiocyanate. The method adds potassium thiocyanate into an electrolyte for electrochemical carbon dioxide reduction under acidic conditions of a copper-based catalyst, or simultaneously adds a potassium ion-containing salt and a thiocyanate ion-containing salt, and the existing potassium thiocyanate salt in the electrolyte can effectively regulate the electronic structure of a Cu surface, promote deep hydrogenation of an intermediate in a carbon dioxide reduction reaction, thereby improving the selectivity of methane synthesis, and meeting the needs of industrialized carbon dioxide electro-reduction to produce methane.

The present invention provides a water treatment device that can stably treat COD components while suppressing the generation of nitrite to a low level. [Solution] A water treatment apparatus comprising a biological treatment tank containing activated sludge containing bacteria capable of decomposing COD components, and into which water to be treated containing ammonia and thiocyanate ions is introduced. This water treatment apparatus comprises an aeration device that performs aeration in the biological treatment tank, and a measuring unit that measures at least one concentration value selected from the group consisting of ammonium concentration, nitrite concentration, and nitrate concentration in the treated water obtained by treating the water to be treated in the biological treatment tank. Furthermore, this water treatment apparatus comprises a control unit that adjusts the aeration airflow rate based on the difference between the ammonium concentration in the water to be treated and the ammonium concentration in the treated water measured by the measuring unit, and at least one index value selected from the group consisting of nitrite concentration, nitrate concentration, and the sum of nitrite concentration and nitrate concentration in the treated water measured by the measuring unit.