APPARATUS AND METHOD FOR TREATING WASTE WATER CONTAINING NITRIC ACID AND NITROUS ACID

• Main Authors: EGUCHI MASAHIRO, KANAI YUKI
• Format: Patent
• Language: English
• Published: 26.06.2014
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METALLURGY; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide an apparatus and a method for treating waste water containing nitric acid and nitrous acid, in each of which the nitric acid concentration and nitrous acid concentration of the waste water can be measured quickly.SOLUTION: The apparatus for treating waste water containing nitric acid and nitrous acid includes: a hydrogen donor pump 26 for adding a hydrogen donor to the waste water containing nitric acid and nitrous acid; a denitrification tank 14 in which the hydrogen donor-added waste water is subjected to anaerobic biological treatment; an ultraviolet absorbance method-applied sensor 20 for measuring the nitric acid concentration and nitrous acid concentration of the waste water; an ion electrode method-applied sensor 18 for measuring the nitric acid concentration of the waste water; and a control part 28 for controlling the amount of the hydrogen donor to be added to the waste water by using the hydrogen donor pump 26 on the basis of the nitric acid concentration and nitrous acid concentration of the waste water, which are obtained by using the nitric acid concentration and nitrous acid concentration measured by the ultraviolet absorbance method-applied sensor 20 and the nitric acid concentration measured by the ion electrode method-applied sensor 18.