Development of a demister for a waste evaporator using a hydrophobic membrane filter

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Nuclear Technology; (United States)

OSTI ID:6688015

Funabashi, Kiyomi; Chino, Koichi; Baba, Tsutomu; Tsuchiya, Hiroyuki; Izumida, Tatsuo; Sawa, Toshio ^[1]

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1. Hitachi Ltd., Ibaraki (Japan)

A demister using a hydrophobic porous membrane made from polytetrafluoroethylene was developed to improve the decontamination factor (DF) of a waste evaporator. The demister removes the radioactive mist in steam generated from the evaporator. A large-scale membrane module (membrane surface area: 3 m[sup 2]) for the demister was newly designed, and its steam permeation rate and DF were experimentally examined using steam containing simulated mist (5 wt% Na[sub 2]SO[sub 4] solution). The steam permeation rate decreases due to adhesion of removed mist on the membrane surface, but it is maintained at [approximately]0.35 of the initial value through falling of the mist from the membrane surface due to the mist particles' own weight. The DF of the demister, using a membrane having less than a 0.7-[mu]m pore diameter, is >5 [times] 10[sup 3]. The total DF of the evaporator with the new demister is estimated to be >5 [times] 10[sup 7].

• OSTI ID: 6688015
• Journal Information: Nuclear Technology; (United States), Journal Name: Nuclear Technology; (United States) Vol. 108:3; ISSN 0029-5450; ISSN NUTYBB
• Country of Publication: United States
• Language: English

Related Subjects

052001* -- Nuclear Fuels-- Waste Processing
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CLEANING
DECONTAMINATION
DESIGN
EVAPORATORS
EXTRACTION APPARATUSES
FILTERS
LIQUID WASTES
MANAGEMENT
MEMBRANES
NUCLEAR FACILITIES
PERFORMANCE
PROCESSING
RADIOACTIVE WASTE FACILITIES
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
SEPARATION EQUIPMENT
WASTE MANAGEMENT
WASTE PROCESSING
WASTES