METHOD AND APPARATUS FOR TREATING WATER

• Main Authors: SEKI HIDEJI, AKAI YOSHIE, SHIGENIWA SHINOBU, NAGAYAMA HIDECHIKA, OSAKI MASAHIKO
• Format: Patent
• Language: English
• Published: 19.11.2009
• Subjects: AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHINBOILERS; BLASTING; CHEMISTRY; CONTROLLING WATER LEVEL; DECONTAMINATION ARRANGEMENTS THEREFOR; FEED-WATER SUPPLY; HEATING; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; METHODS OF STEAM GENERATION; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR POWER PLANT; NUCLEAR REACTORS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; SEPARATION; STEAM BOILERS; STEAM GENERATION; TRANSPORTING; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE; WEAPONS

PROBLEM TO BE SOLVED: To reduce heat loss owing to a cooling operation of blowdown water and to suppress consumption of chemicals such as ammonia by reducing load on the desalination of impurity ions by using a desalination unit for selectively removing only impurity ions at high temperature. SOLUTION: In a method for treating ammonia-containing water 12 to be treated by using the desalination unit 11 having a pair of diaphragms 14 and electrodes 17 which are arranged to be opposed to each other on the outside of the pair of diaphragms 14 and between which a DC voltage is applied, the water 12 to be treated is treated at ≥100°C to obtain the treated water from which impurity ion components are removed and in which ammonia is concentrated. COPYRIGHT: (C)2010,JPO&INPIT