JP2017225924A5

JP2017225924A5 -

Info

Publication number: JP2017225924A5
Application number: JP2016123176A
Authority: JP
Filing date: 2016-06-22
Publication date: 2018-09-13
Anticipated expiration: 2036-06-22

Description

上記目的を達成するため、請求項１に記載の排水処理方法の発明では、少なくとも硝酸イオンを含有する水溶液を反応槽（２００）に供給する水溶液供給工程と、反応槽への水溶液の供給時、あるいは反応槽への水溶液の供給後の少なくとも何れかに、硝酸イオンの還元反応に用いられる還元剤を水溶液に１回あるいは複数回に分けて供給する還元剤供給工程と、反応槽への水溶液の供給完了後、あるいは供給完了前に、反応槽の水溶液に還元剤の存在下で紫外線照射装置から紫外線を照射して硝酸イオンの還元反応を進行させる硝酸イオン低減工程と、硝酸イオンの還元反応によって水溶液の硝酸イオン濃度が低減した後、反応槽から水溶液を排出する水溶液排出工程とを備え、水溶液供給工程、還元剤供給工程、硝酸イオン低減工程および水溶液排出工程を繰り返し行うことが可能であり、紫外線照射装置は、ランプ部（２０７ａ）と、ランプ部を収容するケース部（２０７ｂ）とを有し、ケース部の内部には媒体が流通してランプ部を冷却することを特徴としている。 In order to achieve the above object, in the invention of the wastewater treatment method according to claim 1, an aqueous solution supplying step of supplying an aqueous solution containing at least nitrate ions to the reaction vessel (200), and at the time of supplying the aqueous solution to the reaction vessel, Alternatively, a reducing agent supplying step for supplying the reducing agent used for the reduction reaction of nitrate ions to the aqueous solution once or a plurality of times at least after supply of the aqueous solution to the reaction vessel, and the aqueous solution to the reaction vessel After the supply is completed or before the supply is completed, the aqueous solution in the reaction vessel is irradiated with ultraviolet rays from an ultraviolet irradiation device in the presence of a reducing agent to promote the reduction reaction of nitrate ions, and the reduction reaction of nitrate ions An aqueous solution discharge step of discharging the aqueous solution from the reaction tank after the nitrate ion concentration of the aqueous solution is reduced, and an aqueous solution supply step, a reducing agent supply step, a nitrate ion reduction step, and Ri can der repeating the solution discharge step, the ultraviolet irradiation apparatus, a lamp unit and (207a), the case portion for storing the lamp unit and has a (207b), medium is circulated inside the casing section The lamp part is cooled .

Claims

An aqueous solution supplying step of supplying an aqueous solution containing at least nitrate ions to the reaction vessel (200);
At least one of the reducing agent used for the reduction reaction of nitrate ions at the time of supplying the aqueous solution to the reaction vessel or after the supply of the aqueous solution to the reaction vessel is divided into the aqueous solution once or plural times. A reducing agent supply step to supply,
Nitric acid that proceeds after the completion of the supply of the aqueous solution to the reaction tank or before the completion of the supply, by irradiating the aqueous solution of the reaction tank with ultraviolet rays from an ultraviolet irradiation device in the presence of the reducing agent to advance the reduction reaction of nitrate ions. An ion reduction process;
An aqueous solution discharge step of discharging the aqueous solution from the reaction tank after the nitrate ion concentration of the aqueous solution is reduced by the reduction reaction of the nitrate ions,
The aqueous solution supplying step, the reducing agent supplying step, Ri can der repeatedly performing the nitrate ion reduction step and the solution discharge step,
The ultraviolet irradiation device has a lamp part (207a) and a case part (207b) for housing the lamp part, and a wastewater treatment method for cooling the lamp part by circulating a medium inside the case part. .